Debt Securities, Held-to-maturity, Allowance for Credit Loss

8,631.0

^[1]

7,092.0

^[2]

(6.0)

(5.2)

Debt Securities, Held-to-maturity, Net of Allowance

1,186.0

1,112.0

1,361.0

1,284.0

Investments in restricted stock, at cost

139.0

^[1]

160.0

^[2]

243.0

224.0

Loans and Leases Receivable, Net of Deferred Income

3,156.0

1,184.0

Loans:

47,875.0

51,862.0

Less: Allowance for credit losses

(321.1)

(309.7)

Net loans held for investment

47,554.0

51,552.0

Premises and equipment, net

1,007.0

1,148.0

315.0

276.0

Operating Lease, Right-of-Use Asset

151.0

163.0

Bank owned life insurance

184.0

182.0

Goodwill and intangible assets, net

674.0

680.0

Deferred Income Tax Assets, Net

315.0

311.0

Investments in LIHTC and renewable energy

596.0

624.0

Other assets

1,681.0

1,811.0

Total assets

68,160.0

67,734.0

Deposits:

Non-interest-bearing demand

16,733.0

19,691.0

Interest-bearing

34,308.0

33,953.0

Total deposits

51,041.0

53,644.0

Operating Lease, Liability

9,567.0

6,299.0

Qualifying debt

888.0

893.0

179.0

185.0

Other liabilities

800.0

1,357.0

Total liabilities

62,475.0

62,378.0

Commitments and Contingencies

Preferred Stock, Par or Stated Value Per Share

$ 0.0001

Preferred Stock, Liquidation Preference Per Share

$ 25

Preferred Stock, Shares Authorized

20,000,000

Preferred Stock, Shares Outstanding

12,000,000

Common stock, par value

$ 0.0001

Common stock, shares authorized

200,000,000

Common Stock, Shares, Issued

112,211,949

111,465,292

Treasury Stock, Common, Shares

2,701,985

2,550,766

Stockholders’ equity:

Preferred Stock, Value, Issued

$ 295.0

Common Stock, Value, Issued

2,180.0

2,163.0

Treasury Stock, Value

(116.0)

(105.0)

Accumulated other comprehensive loss

(610.5)

(661.0)

Retained earnings

3,937.0

3,664.0

Total stockholders’ equity

5,684.9

5,356.0

Total liabilities and stockholders’ equity

$ 68,160.0

$ 67,734.0

[1]	ratings differ, the Company uses an average of the available ratings by major credit agencies.
[2]	For rated securities, if ratings differ, the Company uses an average of the available ratings by major credit agencies.

CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($) $ in Millions	Jun. 30, 2023	Dec. 31, 2022
Debt Securities, Available-for-sale, Amortized Cost	$ 9,454	$ 7,973
Debt Securities, Held-to-maturity, Fair Value	$ 1,186	$ 1,112
Common stock, par value	$ 0.0001	$ 0.0001
Common stock, shares authorized	200,000,000	200,000,000
Common stock, shares issued	112,211,949	111,465,292
Treasury Stock, Value	$ 116	$ 105

CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) $ in Thousands, shares in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Interest income:
Loans, including fees	$ 857,200	$ 516,600	$ 1,689,900	$ 951,300
Investment securities	110,300	57,600	204,600	104,300
Dividends and other	33,300	5,400	75,200	8,500
Total interest income	1,000,800	579,600	1,969,700	1,064,100
Interest expense:
Deposits	251,100	27,100	482,700	41,200
Qualifying debt	9,500	8,600	18,800	17,000
Other borrowings	189,900	18,900	308,000	31,400
Total interest expense	450,500	54,600	809,500	89,600
Net interest income	550,300	525,000	1,160,200	974,500
Provision for credit losses	21,800	27,500	41,200	36,500
Net interest income after provision for credit losses	528,500	497,500	1,119,000	938,000
Non-interest income:
Net gain on loan origination and sale activities	62,300	27,200	93,700	64,100
Loan servicing fees, net	24,100	45,400	66,000	86,500
Service charges and fees	20,800	7,600	30,300	14,600
Commercial banking related income	6,000	5,800	12,200	10,900
Gain on recovery from credit guarantees	1,200	9,000	4,500	11,300
Income from equity instruments	700	5,200	2,100	9,300
Gain on sales of investment securities	(13,600)	200	26,100	(6,700)
Assets, Fair Value Adjustment	12,700	(10,000)	(135,100)	(16,600)
Other income	4,800	5,000	13,400	14,500
Total non-interest income	119,000	(95,000)	(61,000)	(201,300)
Non-interest expense:
Salaries and employee benefits	145,600	139,000	294,500	277,300
Deposit costs	91,000	18,100	177,900	27,400
Insurance	33,000	6,900	48,700	14,100
Data processing	28,600	19,700	55,000	37,300
Legal, professional, and directors' fees	26,400	25,100	49,500	49,100
Expense Related to Distribution or Servicing and Underwriting Fees	18,400	14,700	32,200	25,500
Occupancy	15,400	13,000	31,900	25,800
Loan Processing Fee	5,600	6,400	10,000	12,900
Business development and marketing	5,000	5,400	10,200	9,800
Gain (Loss) on Extinguishment of Debt	(700)	0	(13,400)	0
Other expense	19,100	20,600	38,800	38,300
Total non-interest expense	387,400	268,900	735,300	517,500
Income before provision for income taxes	260,100	323,600	444,700	621,800
Income Tax Expense (Benefit)	44,400	63,400	86,800	121,500
Net income	215,700	260,200	357,900	500,300
Preferred Stock Dividends, Income Statement Impact	3,200	3,200	6,400	6,400
Net income available to common shareholders	$ 212,500	$ 257,000	$ 351,500	$ 493,900
Earnings per share:
Basic	$ 1.96	$ 2.40	$ 3.25	$ 4.63
Diluted	$ 1.96	$ 2.39	$ 3.24	$ 4.61
Weighted average number of common shares outstanding:
Basic	108.3	107.3	108.2	106.7
Diluted	108.3	107.7	108.3	107.1
Dividends declared per common share	$ 0.36	$ 0.35	$ 0.72	$ 0.70

CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Statement of Comprehensive Income [Abstract]
Net income	$ 215.7	$ 260.2	$ 357.9	$ 500.3
Other comprehensive income (loss), net:
Unrealized (loss) gain on AFS securities, net of tax effect of $11.2, $93.3, $(9.5), and $174.1 respectively	11.2	93.3	(9.5)	174.1
OCI, Debt Securities, Available-for-Sale, Unrealized Holding Gain (Loss), before Adjustment, after Tax	(34.2)	(284.5)	25.9	(532.4)
Unrealized gain (loss) on junior subordinated debt, net of tax effect of $(1.7), $(0.7), $(1.3), and $(1.4) respectively	1.7	(0.7)	1.3	1.4
Other Comprehensive Income (Loss), Financial Liability, Fair Value Option, Unrealized Gain (Loss) Arising During Period, after Tax	(5.0)	2.0	3.9	4.2
Realized loss (gain) on sale of AFS securities included in income, net of tax effect of $(3.4), $0.1, $(6.6), and $1.9 respectively	3.4	0.1	6.6	(1.9)
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Sale of Securities, Net of Tax	10.2	(0.3)	19.5	(5.4)
Other Comprehensive (Income) Loss, Reclassification Adjustment from AOCI for Write-down of Securities, Tax	0.0	0.0	(0.4)	0.0
Net other comprehensive (loss) income	(19.0)	(282.8)	50.5	(533.6)
Comprehensive income (loss)	196.7	(22.6)	408.4	(33.3)
OCI, Debt Securities, Available-for-Sale, Gain (Loss), after Adjustment and Tax	0.0	0.0	1.2	0.0
Accumulated Other Comprehensive Income (Loss) [Line Items]
Debt Securities, Available-for-Sale, Allowance for Credit Loss, Excluding Accrued Interest	4.4		4.4
Debt Securities, Available-for-Sale, Excluding Accrued Interest, Allowance for Credit Loss, Writeoff	0.0		(17.1)
Debt Securities, Available-for-Sale, Excluding Accrued Interest, Allowance for Credit Loss, Recovery	0.0		0.0
Debt Securities, Held-to-Maturity, Allowance for Credit Loss, Excluding Accrued Interest	6.0	3.2	6.0	3.2
Debt Securities, Held-to-Maturity, Excluding Accrued Interest, Credit Loss Expense (Reversal)	(0.5)	0.0	0.8	2.0
Debt Securities, Held-to-Maturity, Excluding Accrued Interest, Allowance for Credit Loss, Writeoff	0.0	0.0	0.0	0.0
Debt Securities, Held-to-Maturity, Excluding Accrued Interest, Allowance for Credit Loss, Recovery	0.0	$ 0.0	0.0	$ 0.0
Accrued Investment Income Receivable	$ 4.0		$ 4.0

CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY - USD ($)
$ in Millions

Total

Preferred Stock [Member]

Common Stock [Member]

Additional Paid in Capital [Member]

Accumulated Other Comprehensive Income (Loss) [Member]

Retained Earnings [Member]

Treasury Stock, Common

Beginning balance, shares at Dec. 31, 2021

12,000,000.0

106,600,000

Beginning balance at Dec. 31, 2021

$ 4,962.6

$ 294.5

$ 0.0

$ 1,966.2

$ 15.7

$ 2,773.0

$ 86.8

Increase (Decrease) in Stockholders' Equity [Roll Forward]

500.3

(600,000)

20.9

^[1]

200,000

Stock Issued During Period, Shares, New Issues

^[1]

$ 17.5

17.5

1,300,000

Stock Issued During Period, Value, New Issues

$ 107.7

107.7

(6.4)

(75.2)

Ending balance, shares at Jun. 30, 2022

(533.6)

12,000,000.0

108,300,000

Ending Balance at Jun. 30, 2022

4,958.8

$ 294.5

$ 0.0

2,094.8

(517.9)

3,191.7

104.3

Beginning balance, shares at Mar. 31, 2022

12,000,000.0

108,300,000

Beginning balance at Mar. 31, 2022

5,011.6

$ 294.5

$ 0.0

2,083.7

(235.1)

2,972.6

104.1

Increase (Decrease) in Stockholders' Equity [Roll Forward]

260.2

0

11.1

^[1]

0

^[1]

0.2

(3.2)

(37.9)

Ending balance, shares at Jun. 30, 2022

(282.8)

12,000,000.0

108,300,000

Ending Balance at Jun. 30, 2022

4,958.8

$ 294.5

$ 0.0

2,094.8

(517.9)

3,191.7

104.3

Beginning balance, shares at Dec. 31, 2022

12,000,000.0

108,900,000

Beginning balance at Dec. 31, 2022

5,356.0

$ 294.5

$ 0.0

2,163.7

(661.0)

3,664.1

105.3

Increase (Decrease) in Stockholders' Equity [Roll Forward]

357.9

(700,000)

16.6

^[1]

100,000

^[1]

10.9

(6.4)

(78.8)

Ending balance, shares at Jun. 30, 2023

50.5

12,000,000.0

109,500,000

Ending Balance at Jun. 30, 2023

5,684.9

$ 294.5

$ 0.0

2,180.3

(610.5)

3,936.8

116.2

Beginning balance, shares at Mar. 31, 2023

12,000,000.0

109,500,000

Beginning balance at Mar. 31, 2023

5,520.5

$ 294.5

$ 0.0

2,169.8

(591.5)

3,763.7

116.0

Increase (Decrease) in Stockholders' Equity [Roll Forward]

215.7

0

10.5

^[1]

0

^[1]

0.2

(3.2)

(39.4)

Ending balance, shares at Jun. 30, 2023

(19.0)

12,000,000.0

109,500,000

Ending Balance at Jun. 30, 2023

$ 5,684.9

$ 294.5

$ 0.0

$ 2,180.3

$ (610.5)

$ 3,936.8

$ 116.2

[1]

The fair value of assets and liabilities measured at fair value on a recurring basis was determined using the following inputs:


	Fair Value Measurements at the End of the Reporting Period Using:
	Quoted Prices in Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)		Fair Value
June 30, 2023	(in millions)

Assets:




Available-for-sale debt securities
CLO	$	—	$	2,144	$	—	$	2,144
Commercial MBS issued by GSEs	—		60		—		60
Corporate debt securities	—		338		—		338
Private label residential MBS	—		1,141		—		1,141
Residential MBS issued by GSEs	—		1,765		—		1,765
Tax-exempt	—		830		—		830

U.S. Treasury securities	2,286		—		—		2,286
Other	27		40		—		67
Total AFS debt securities	$	2,313	$	6,318	$	—	$	8,631
Equity securities
Common stock	$	2	$	—	$	—	$	2
CRA investments	25		12		—		37
Preferred stock	95		5		—		100
Total equity securities	$	122	$	17	$	—	$	139
Loans HFS (2)	$	—	$	1,337	$	3	$	1,340
MSRs	—		—		1,007		1,007
Derivative assets (1)	—		98		6		104
Liabilities:
Junior subordinated debt (3)	$	—	$	—	$	57	$	57
Derivative liabilities (1)	—		37		4		41

(1)See "Note 11. Derivatives and Hedging Activities." In addition, the carrying value of loans is decreased by $52 million as of June 30, 2023 for the effective portion of the hedge, which relates to the fair value of the hedges put in place to mitigate against fluctuations in interest rates. Derivative assets and liabilities exclude margin of $85 million and $12 million, respectively.

(2)Includes only the portion of loans HFS that is recorded at fair value at each reporting period pursuant to the election of FVO treatment.

(3)Includes only the portion of junior subordinated debt that is recorded at fair value at each reporting period pursuant to the election of FVO treatment.


	Fair Value Measurements at the End of the Reporting Period Using:
	Quoted Prices in Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)		Fair Value
December 31, 2022	(in millions)

Assets:




Available-for-sale debt securities
CLO	$	—	$	2,706	$	—	$	2,706
Commercial MBS issued by GSEs	—		97		—		97
Corporate debt securities	—		390		—		390
Private label residential MBS	—		1,199		—		1,199
Residential MBS issued by GSEs	—		1,740		—		1,740
Tax-exempt	—		891		—		891


Other	24		45		—		69
Total AFS debt securities	$	24	$	7,068	$	—	$	7,092
Equity securities
Common stock	$	3	$	—	$	—	$	3
CRA investments	24		25		—		49
Preferred stock	108		—		—		108
Total equity securities	$	135	$	25	$	—	$	160
Loans - HFS (2)	$	—	$	1,172	$	1	$	1,173
Mortgage servicing rights	—		—		1,148		1,148
Derivative assets (1)	—		42		5		47
Liabilities:
Junior subordinated debt (3)	$	—	$	—	$	63	$	63
Derivative liabilities (1)	—		36		3		39

(1)See "Note 11. Derivatives and Hedging Activities." In addition, the carrying value of loans is decreased by $17 million as of December 31, 2022 for the effective portion of the hedge, which relates to the fair value of the hedges put in place to mitigate against fluctuations in interest rates. Derivative assets and liabilities exclude margin of $4 million and $1 million, respectively.

(2)Includes only the portion of loans HFS that is recorded at fair value at each reporting period pursuant to the election of FVO treatment.

(3)Includes only the portion of junior subordinated debt that is recorded at fair value at each reporting period pursuant to the election of FVO treatment.

CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022
Cash flows from operating activities:
Net income	$ 357,900	$ 500,300
Adjustments to reconcile net income to net cash provided by (used in) operating activities:
Provision for credit losses	41,200	36,500
Depreciation and amortization	34,000	22,800
Stock-based compensation	16,500	20,900
Deferred income taxes	(21,600)	(10,900)
Amortization of net (discounts) premiums for investment securities	(15,400)	12,300
Amortization of tax credit investments	39,000	28,800
Amortization of operating lease right of use asset	11,800	10,800
Amortization of net deferred loan fees and net purchase premiums	(46,900)	(30,500)
Payments for Origination and Purchases of Loans Held-for-sale	19,947,200	25,371,000
Proceeds from Sale and Collection of Loans Held-for-sale	19,751,600	26,301,500
Servicing Asset at Fair Value, Additions	387,200	397,500
Net losses (gains) on:
Servicing Asset at Fair Value, Period Increase (Decrease)	(24,200)	109,800
Assets, Fair Value Adjustment, Non-Cash	137,900	16,600
Gain (Loss) on Sale of Investments	(26,100)	(6,700)
Gain (Loss) on Extinguishment of Debt	(13,400)	0
Other Operating Activities, Cash Flow Statement	2,900	5,000
Other assets and liabilities, net	(105,700)	(59,100)
Net cash (used in) provided by operating activities	(100,100)	(960,000)
Investment securities - AFS
Payments to Acquire Debt Securities, Available-for-sale	5,111,100	2,235,400
Principal pay downs and maturities	2,917,300	410,500
Proceeds from sales	770,400	119,600
Debt Securities, Held-to-maturity [Abstract]
Purchases	105,900	129,500
Principal pay downs and maturities	27,700	18,900
Equity Securities, FV-NI, Gain (Loss) [Abstract]
Purchases	(2,100)	(34,900)
Redemptions	300	300
Proceeds from Sale of Equity securities, FV-NI	0	14,100
Proceeds from Sale of Mortgage Servicing Rights (MSR)	464,300	363,800
Purchase of Other Investments	(102,600)	(168,600)
Net decrease (increase) in loans HFI	1,569,100	(7,954,500)
Purchase of premises, equipment, and other assets, net	(60,800)	(47,400)
Payments to Acquire Businesses, Net of Cash Acquired	0	50,000
Net cash provided by (used in) investing activities	366,600	9,693,100
Cash flows from financing activities:
Net (decrease) increase in deposits	(2,603,000)	6,100,100
Net proceeds from issuance of long-term debt	9,900	486,600
Repayments of Subordinated Debt	(531,500)	(17,400)
Net increase in short-term borrowings	1,603,800	3,524,600
Proceeds from Short-Term Debt, Maturing in More than Three Months	2,661,800	0
Repayments of Short-Term Debt, Maturing in More than Three Months	(201,600)	0
Cash paid for tax withholding on vested restricted stock and other	10,900	17,500
Cash dividends paid on common stock and preferred stock	85,200	81,600
Proceeds from Issuance of Common Stock	0	107,700
Net cash provided by financing activities	843,300	10,102,500
Cash, Cash Equivalents, Restricted Cash, and Restricted Cash Equivalents, Period Increase (Decrease), Including Exchange Rate Effect	1,109,800	1,369,400
Cash, cash equivalents, and restricted cash at beginning of period	1,043,400	516,400
Cash, cash equivalents, and restricted cash at end of period	2,153,200	1,885,800
Cash paid during the period for:
Interest Paid, Excluding Capitalized Interest, Operating Activities	740,900	87,900
Income Taxes Paid, Net	44,500	185,000
Transfers of mortgage-backed securities in settlement of secured borrowings	275,600	281,500
Net increase (decrease) in unfunded commitments and obligations	12,600	207,200
Transfers of securitized LHFS to AFS securities	86,700	89,600
Transfer of Portfolio Loans and Leases to Held-for-sale	6,275,200	0
Transfer of EBO loans previously classified as HFS to HFI	$ 1,007,700	$ 1,505,700

Deposits (Tables) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
Deposits (Tables) - USD ($) $ in Millions	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022	Dec. 31, 2022
Statement of Financial Position [Abstract]
Non-interest-bearing demand	$ 16,733.0		$ 16,733.0		$ 19,691.0
Interest-Bearing Domestic Deposit, Demand	12,646.0		12,646.0		9,507.0
Deposits, Savings Deposits	13,085.0		13,085.0		19,397.0
Time Deposits, $250,000 or more	6,677.0		6,677.0		3,815.0
Time Deposits, Less than $250,000	1,900.0		1,900.0		1,234.0
Deposits	51,041.0		51,041.0		53,644.0
Reciprocal Deposits	11,400.0		11,400.0		2,800.0
Deposits, earnings credit	14,900.0		14,900.0		12,900.0
Deposits costs, deposits with earnings credits	87.8	$ 17.3	173.4	$ 26.0
Deposits, Wholesale	18,300.0		18,300.0		$ 4,800.0
Time Deposit Maturities, Year One	4,972.0		4,972.0
Time Deposit Maturities, Year Two	3,202.0		3,202.0
Time Deposit Maturities, Year Three	400.0		400.0
Time Deposit Maturities, Year Four	2.0		2.0
Time Deposit Maturities, Year Five	1.0		1.0
Time Deposits	$ 8,577.0		$ 8,577.0

Summary of Significant Accounting Policies	6 Months Ended
Summary of Significant Accounting Policies	Jun. 30, 2023
Accounting Policies [Abstract]
Summary of Significant Accounting Policies	Nature of operations WAL is a bank holding company headquartered in Phoenix, Arizona, incorporated under the laws of the state of Delaware. WAL provides a full spectrum of customized loan, deposit, and treasury management capabilities, including 24/7 funds transfer and other digital payment offerings through its wholly-owned banking subsidiary, WAB. WAB operates the following full-service banking divisions: ABA, BON, FIB, Bridge, and TPB. The Company also serves business customers through a national platform of specialized financial services, including mortgage banking services through AmeriHome, and digital payment services for the class action legal industry through DST. In addition, the Company has the following non-bank subsidiaries: CSI, a captive insurance company formed and licensed under the laws of the State of Arizona and established as part of the Company's overall enterprise risk management strategy, and WATC, which provides corporate trust services and levered loan administration solutions. Basis of presentation The accompanying Unaudited Consolidated Financial Statements as of June 30, 2023 and for the three and six months ended June 30, 2023 and 2022 have been prepared in accordance with GAAP for interim financial information and Article 10 of Regulation S-X and, therefore, do not include all of the information and footnotes required by GAAP for complete financial statements. Accordingly, these statements should be read in conjunction with the Company's audited Consolidated Financial Statements included in the Company's Annual Report on Form 10-K for the year ended December 31, 2022. The accounts of the Company and its consolidated subsidiaries are included in the Consolidated Financial Statements. The information furnished in these interim statements reflects all adjustments that are, in the opinion of management, necessary for a fair statement of the results for each respective period presented. Such adjustments are of a normal, recurring nature. The results of operations in the interim statements are not necessarily indicative of the results that may be expected for any other quarter or for the full year. Recent accounting pronouncements Accounting for Investments in Tax Credit Structures Using the Proportional Amortization Method In March 2023, the FASB issued guidance within ASU 2023-02, Investments — Equity Method and Joint Ventures (Topic 323). The amendments in this update permit entities to elect to account for tax equity investments, regardless of the tax credit program from which the income tax credits are received, using the proportional amortization method if certain conditions are met. Previously this option was only permitted for LIHTC investments. Additionally, the amendments in this update require that all tax equity investments accounted for using the proportional amortization method apply the delayed equity contribution guidance in Subtopic 323-740 and disclosure of the nature of an entity's tax equity investments and their effect on an entity's financial position and results of operations. The amendments in this update are effective for fiscal years beginning after December 15, 2023, including interim periods within those fiscal years and are applied on a modified retrospective or a retrospective basis. The adoption of this guidance is not expected to have a material impact on the Company's Consolidated Financial Statements. Recently adopted accounting guidance Troubled Debt Restructurings and Vintage Disclosures In March 2022, the FASB issued guidance within ASU 2022-02, Financial Instruments—Credit Losses (Topic 326). The amendments in this update eliminate the accounting guidance and related disclosures for TDRs by creditors in Subtopic 310-40, Receivables—Troubled Debt Restructurings by Creditors, while enhancing disclosure requirements for certain loan refinancings and restructurings by creditors when a borrower is experiencing financial difficulty and requiring an entity to disclose current-period gross write-offs by year of origination for financing receivables and net investments in leases within the scope of Subtopic 326-20, Financial Instruments—Credit Losses—Measured at Amortized Cost. The Company adopted this accounting guidance prospectively on January 1, 2023. The adoption of this guidance did not have a material impact on the Company's Consolidated Financial Statements. Use of estimates The preparation of financial statements in conformity with GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosures of contingent assets and liabilities at the date of the financial statements and the reported amounts of revenues and expenses during the reporting period. Management's estimates and judgments are ongoing and are based on experience, current and expected future conditions, third-party evaluations and various other assumptions that management believes are reasonable under the circumstances. The results of these estimates form the basis for making judgments about the carrying values of assets and liabilities, as well as identifying and assessing the accounting treatment with respect to commitments and contingencies. Actual results may differ from those estimates and assumptions used in the Consolidated Financial Statements and related notes. Material estimates that are susceptible to significant changes in the near term relate to: 1) the determination of the ACL; 2) certain assets and liabilities carried at fair value; and 3) accounting for income taxes. Principles of consolidation As of June 30, 2023, WAL has the following significant wholly-owned subsidiaries: WAB and eight unconsolidated subsidiaries used as business trusts in connection with the issuance of trust-preferred securities. WAB has the following significant wholly-owned subsidiaries: 1) WABT, which holds certain investment securities, municipal and nonprofit loans, and leases; 2) WA PWI, which holds interests in certain limited partnerships invested primarily in low income housing tax credits and small business investment corporations; 3) Helios Prime, which holds interests in certain limited partnerships invested in renewable energy projects; 4) BW Real Estate, Inc., which operates as a real estate investment trust and holds certain of WAB's real estate loans and related securities; and 5) Western Finance Company, which purchases and originates equipment finance leases and provides mortgage banking services through its wholly-owned subsidiary, AmeriHome. The Company does not have any other significant entities that should be consolidated. All significant intercompany balances and transactions have been eliminated in consolidation. Reclassifications Certain amounts in the Consolidated Income Statements for the prior periods have been reclassified to conform to the current presentation. The reclassifications had no effect on net income or stockholders’ equity as previously reported. Goodwill and other intangible assets The Company evaluated whether the continued effects from the March 2023 bank failures may give rise to a triggering event and elected to perform a Step 0 goodwill impairment assessment, which included analyzing qualitative factors applicable to the Company, the financial performance of the Company, and valuation metrics of publicly traded companies comparable to the Company and its reporting units. As of June 30, 2023, the Company does not believe that these events or circumstances have significantly altered the long-term financial performance of the Company. Accordingly, it was determined that it is more likely than not that the fair value of the Company and its reporting units exceeds their respective carrying values as of June 30, 2023. The Company's goodwill totaled $527 million at June 30, 2023 and December 31, 2022, with $290 million and $237 million allocated to the Commercial and Consumer Related segments, respectively.

Investment Securities

6 Months Ended

Jun. 30, 2023

Investments, Debt and Equity Securities [Abstract]

Investment Securities

d fair values of investment securities are summarized as follows:


	June 30, 2023
	Amortized Cost		Gross Unrealized Gains		Gross Unrealized (Losses)		Fair Value
	(in millions)
Held-to-maturity
Private label residential MBS	$	192	$	—	$	(40)	$	152
Tax-exempt	1,175		1		(142)		1,034
Total HTM securities	$	1,367	$	1	$	(182)	$	1,186

Available-for-sale debt securities
CLO	$	2,183	$	—	$	(39)	$	2,144
Commercial MBS issued by GSEs	69		—		(9)		60
Corporate debt securities	411		—		(73)		338

Private label residential MBS	1,371		—		(230)		1,141
Residential MBS issued by GSEs	2,141		—		(376)		1,765
Tax-exempt	919		—		(89)		830

U.S. Treasury securities	2,286		—		—		2,286
Other	74		3		(10)		67
Total AFS debt securities	$	9,454	$	3	$	(826)	$	8,631


	December 31, 2022
	Amortized Cost		Gross Unrealized Gains		Gross Unrealized (Losses)		Fair Value
	(in millions)
Held-to-maturity
Private label residential MBS	$	198	$	—	$	(39)	$	159
Tax-exempt	1,091		—		(138)		953
Total HTM securities	$	1,289	$	—	$	(177)	$	1,112

Available-for-sale debt securities
CLO	$	2,796	$	—	$	(90)	$	2,706
Commercial MBS issued by GSEs	104		1		(8)		97
Corporate debt securities	429		—		(39)		390

Private label residential MBS	1,442		—		(243)		1,199
Residential MBS issued by GSEs	2,123		—		(383)		1,740
Tax-exempt	1,004		2		(115)		891


Other	75		6		(12)		69
Total AFS debt securities	$	7,973	$	9	$	(890)	$	7,092

In addition, the Company held equity securities, which primarily consisted of preferred stock and CRA investments, with a fair value of $139 million and $160 million at June 30, 2023 and December 31, 2022, respectively. Unrealized gains on equity securities of $0.1 million and losses of $10.0 million for the three months ended June 30, 2023 and 2022, respectively, and losses of $8.4 million and $16.7 million for the six months ended June 30, 2023 and 2022, respectively, were recognized in earnings as a component of fair value loss adjustments.

Securities with carrying amounts of approximately $7.3 billion and $1.7 billion at June 30, 2023 and December 31, 2022, respectively, were pledged for various purposes as required or permitted by law.

The following tables summarize the Company's AFS debt securities in an unrealized loss position, aggregated by major security type and length of time in a continuous unrealized loss position:


	June 30, 2023
	Less Than Twelve Months				More Than Twelve Months				Total
	Gross Unrealized Losses		Fair Value		Gross Unrealized Losses		Fair Value		Gross Unrealized Losses		Fair Value
	(in millions)




Available-for-sale debt securities
CLO	$	2	$	261	$	37	$	1,875	$	39	$	2,136
Commercial MBS issued by GSEs	1		12		8		45		9		57
Corporate debt securities (1)	2		15		71		320		73		335
Private label residential MBS	1		28		229		1,084		230		1,112
Residential MBS issued by GSEs	8		239		368		1,508		376		1,747
Tax-exempt	6		130		83		695		89		825


Other	2		18		8		36		10		54
Total AFS securities	$	22	$	703	$	804	$	5,563	$	826	$	6,266

(1)Includes securities with an ACL that have a fair value of $109 million and unrealized losses of $40 million.


	December 31, 2022
	Less Than Twelve Months				More Than Twelve Months				Total
	Gross Unrealized Losses		Fair Value		Gross Unrealized Losses		Fair Value		Gross Unrealized Losses		Fair Value
	(in millions)




Available-for-sale debt securities
CLO	$	81	$	2,467	$	9	$	216	$	90	$	2,683
Commercial MBS issued by GSEs	4		46		4		14		8		60
Corporate debt securities	28		263		11		120		39		383
Private label residential MBS	27		279		216		912		243		1,191
Residential MBS issued by GSEs	82		600		301		1,101		383		1,701
Tax-exempt	93		752		22		78		115		830


Other	4		26		8		26		12		52
Total AFS securities	$	319	$	4,433	$	571	$	2,467	$	890	$	6,900

The total number of AFS debt securities in an unrealized loss position at June 30, 2023 was 797, compared to 832 at December 31, 2022.

On a quarterly basis, the Company performs an impairment analysis on its AFS debt securities that are in an unrealized loss position at the end of the period to determine whether credit losses should be recognized on these securities.

Qualitative considerations made by the Company in its impairment analysis are further discussed below.

Government Issued Securities

Commercial and residential MBS are issued by either government agencies or GSEs. These securities are either explicitly or implicitly guaranteed by the U.S. government and are highly rated by major rating agencies. Further, principal and interest payments on these securities continue to be made on a timely basis.

Non-Government Issued Securities

Qualitative factors used in the Company's credit loss assessment of its securities that are not issued and guaranteed by the U.S. government include consideration of any adverse conditions related to a specific security, industry, or geographic region of its securities, any credit ratings below investment grade, the payment structure of the security and the likelihood of the issuer to be able to make payments that increase in the future, and failure of the issuer to make any scheduled principal or interest payments.

For the Company's corporate debt and tax-exempt securities, the Company also considers various metrics of the issuer including days of cash on hand, the ratio of long-term debt to total assets, the net change in cash between reporting periods, and consideration of any breach in covenant requirements. The Company's corporate debt securities are primarily investment grade, issuers continue to make timely principal and interest payments, and the unrealized losses on these security portfolios primarily relate to changes in interest rates and other market conditions that are not considered to be credit-related issues. The Company continues to receive timely principal and interest payments on its tax-exempt securities and the majority of these issuers have revenues pledged for payment of debt service prior to payment of other types of expenses.

In consideration of the continued effects from the March 2023 bank failures, the Company performed a targeted impairment analysis on its AFS debt securities issued by regional banks held in its corporate debt securities portfolio. The Company considered the issuers' credit ratings, probability of default, and other factors. As a result of the analysis, a $2.2 million and $21.5 million provision for credit losses was recognized during the three and six months ended June 30, 2023, respectively. The provision for credit losses for the six months ended June 30, 2023 included recognition of a $17.1 million charge-off for one debt security issued by a regional bank that was sold. The Company does not intend to sell and it is more likely than not that the Company will not be required to sell the remainder of these regional bank debt securities prior to their anticipated recovery, therefore, no credit losses on the Company's remaining AFS securities portfolio have been recognized during the three and six months ended June 30, 2023.

For the Company's private label residential MBS, which consist of non-agency collateralized mortgage obligations that are secured by pools of residential mortgage loans, the Company also considers metrics such as securitization risk weight factor, current credit support, whether there were any mortgage principal losses resulting from defaults in payments on the underlying mortgage collateral, and the credit default rate over the last twelve months. These securities primarily carry investment grade credit ratings, principal and interest payments on these securities continue to be made on a timely basis, and credit support for these securities is considered adequate.

The Company's CLO portfolio consists of highly rated securitization tranches, containing pools of medium to large-sized corporate, high yield loans. These are variable rate securities that have an investment grade rating of Single-A or better. Unrealized losses on these securities are primarily a function of the differential from the offer price and the valuation mid-market price as well as changes in interest rates.

Unrealized losses on the Company's other securities portfolio relate to taxable municipal and trust preferred securities. The Company is continuing to receive timely principal and interest payments on its taxable municipal securities, these securities continue to be highly rated and the number of days of cash on hand is strong. The Company's trust preferred securities are investment grade and the issuers continue to make timely principal and interest payments.

The following table presents a rollforward by major security type of the ACL on the Company's AFS debt securities:


	Three Months Ended June 30, 2023
	Balance, March 31, 2023		Provision for Credit Losses		Charge-offs		Recoveries		Balance, June 30, 2023
	(in millions)
Available for sale securities
Corporate debt securities	$	2.2	$	2.2	$	—	$	—	$	4.4


	Six Months Ended June 30, 2023
	Balance, December 31, 2022		Provision for Credit Losses		Charge-offs		Recoveries		Balance, June 30, 2023
	(in millions)
Available for sale securities
Corporate debt securities	$	—	$	21.5	$	(17.1)	$	—	$	4.4

There were no credit losses recognized on AFS securities during the three and six months ended June 30, 2022.

The credit loss model under ASC 326-20, applicable to HTM debt securities, requires recognition of lifetime expected credit losses through an allowance account at the time the security is purchased.

The following table presents a rollforward by major security type of the ACL on the Company's HTM debt securities:


	Three Months Ended June 30, 2023
	Balance, March 31, 2023		Provision for Credit Losses		Charge-offs		Recoveries		Balance, June 30, 2023
	(in millions)
Held-to-maturity debt securities
Tax-exempt	$	6.5	$	(0.5)	$	—	$	—	$	6.0


	Six Months Ended June 30, 2023
	Balance, December 31, 2022		Provision for Credit Losses		Charge-offs		Recoveries		Balance, June 30, 2023
	(in millions)
Held-to-maturity debt securities
Tax-exempt	$	5.2	$	0.8	$	—	$	—	$	6.0


	Three Months Ended June 30, 2022:
	Balance, March 31, 2022		Provision for Credit Losses		Charge-offs		Recoveries		Balance June 30, 2022
	(in millions)
Held-to-maturity debt securities
Tax-exempt	$	3.2	$	—	$	—	$	—	$	3.2


	Six Months Ended June 30, 2022:
	Balance, December 31, 2021		Provision for Credit Losses		Charge-offs		Recoveries		Balance June 30, 2022
	(in millions)
Held-to-maturity debt securities
Tax-exempt	$	5.2	$	(2.0)	$	—	$	—	$	3.2

No allowance has been recognized on the Company's HTM private label residential MBS as losses are not expected due to the Company holding a senior position in these securities.

Accrued interest receivable on HTM securities totaled $4 million at June 30, 2023 and December 31, 2022, and is excluded from the estimate of expected credit losses.

The following tables summarize the carrying amount of the Company’s investment ratings position, which are updated quarterly and used to monitor the credit quality of the Company's securities:


	June 30, 2023
	AAA		Split-rated AAA/AA+		AA+ to AA-		A+ to A-		BBB+ to BBB-		BB+ and below		Unrated		Totals
	(in millions)
Held-to-maturity
Private label residential MBS	$	—	$	—	$	—	$	—	$	—	$	—	$	192	$	192
Tax-exempt	—		—		—		—		—		—		1,175		1,175
Total HTM securities (1)	$	—	$	—	$	—	$	—	$	—	$	—	$	1,367	$	1,367

Available-for-sale debt securities
CLO	$	120	$	—	$	1,960	$	64	$	—	$	—	$	—	$	2,144
Commercial MBS issued by GSEs	—		60		—		—		—		—		—		60
Corporate debt securities	—		—		—		70		219		49		—		338
Private label residential MBS	1,115		—		25		—		—		1		—		1,141
Residential MBS issued by GSEs	—		1,765		—		—		—		—		—		1,765
Tax-exempt	9		16		354		376		—		—		75		830

U.S. Treasury securities	—		2,286		—		—		—		—		—		2,286
Other	—		—		9		9		29		3		17		67
Total AFS securities (1)	$	1,244	$	4,127	$	2,348	$	519	$	248	$	53	$	92	$	8,631

Equity securities
Common stock	$	—	$	—	$	—	$	—	$	—	$	—	$	2	$	2
CRA investments	—		25		—		—		—		—		12		37
Preferred stock	—		—		—		—		53		37		10		100
Total equity securities (1)	$	—	$	25	$	—	$	—	$	53	$	37	$	24	$	139

(1)For rated securities, if ratings differ, the Company uses an average of the available ratings by major credit agencies.


	December 31, 2022
	AAA		Split-rated AAA/AA+		AA+ to AA-		A+ to A-		BBB+ to BBB-		BB+ and below		Unrated		Totals
	(in millions)
Held-to-maturity
Private label residential MBS	$	—	$	—	$	—	$	—	$	—	$	—	$	198	$	198
Tax-exempt	—		—		—		—		—		—		1,091		1,091
Total HTM securities (1)	$	—	$	—	$	—	$	—	$	—	$	—	$	1,289	$	1,289

Available-for-sale debt securities
CLO	$	310	$	—	$	2,121	$	275	$	—	$	—	$	—	$	2,706
Commercial MBS issued by GSEs	—		97		—		—		—		—		—		97
Corporate debt securities	—		—		—		74		316		—		—		390
Private label residential MBS	1,158		—		41		—		—		—		—		1,199
Residential MBS issued by GSEs	—		1,740		—		—		—		—		—		1,740
Tax-exempt	11		15		392		425		—		—		48		891


Other	—		—		9		9		27		6		18		69
Total AFS securities (1)	$	1,479	$	1,852	$	2,563	$	783	$	343	$	6	$	66	$	7,092

Equity securities
Common stock	$	—	$	—	$	—	$	—	$	—	$	—	$	3	$	3
CRA investments	—		24		—		—		—		—		25		49
Preferred stock	—		—		—		—		82		17		9		108
Total equity securities (1)	$	—	$	24	$	—	$	—	$	82	$	17	$	37	$	160

(1)For rated securities, if ratings differ, the Company uses an average of the available ratings by major credit agencies.

A security is considered to be past due once it is 30 days contractually past due under the terms of the agreement. As of June 30, 2023, the Company did not have a significant amount of investment securities that were past due or on nonaccrual status.

The amortized cost and fair value of the Company's debt securities by contractual maturities are shown below. MBS are shown separately as individual MBS are comprised of pools of loans with varying maturities. Therefore, these securities are listed separately in the maturity summary.


	June 30, 2023
	Amortized Cost		Estimated Fair Value
	(in millions)
Held-to-maturity
Due in one year or less	$	22	$	22
After one year through five years	6		6
After five years through ten years	33		31
After ten years	1,114		975
Mortgage-backed securities	192		152
Total HTM securities	$	1,367	$	1,186

Available-for-sale
Due in one year or less	$	2,286	$	2,285
After one year through five years	166		149
After five years through ten years	898		832
After ten years	2,523		2,399
Mortgage-backed securities	3,581		2,966
Total AFS securities	$	9,454	$	8,631

The following table presents gross gains and losses on sales of investment securities:


	Three Months Ended June 30,				Six Months Ended June 30,
	2023		2022		2023		2022
	(in millions)
Available-for-sale securities
Gross gains	$	0.1	$	0.4	$	3.5	$	7.3
Gross losses	(13.7)		—		(29.6)		—
Net (losses) gains on AFS securities	$	(13.6)	$	0.4	$	(26.1)	$	7.3

Equity securities
Gross gains	$	—	$	—	$	—	$	—
Gross losses	—		(0.6)		—		(0.6)
Net losses on equity securities	$	—	$	(0.6)	$	—	$	(0.6)

During the three months ended June 30, 2023, the Company sold securities with a carrying value of $355 million and recognized a net loss of $13.6 million. During the six months ended June 30, 2023, the Company sold securities with a carrying value of $814 million and recognized a net loss of $26.1 million. Sales of CLOs were executed as part of the Company's balance sheet repositioning strategy and resulted in the gross losses above. Sales of MBS and tax-exempt municipal securities were completed to secure gains. During the three and six months ended June 30, 2022, the Company sold securities with a carrying value of $22 million and $107 million, respectively, and incurred a net loss of $0.2 million and a net gain of $6.7 million.

Accumulated Other Comprehensive Income

6 Months Ended

Jun. 30, 2023

Equity [Abstract]

Accumulated Other Comprehensive Income

The following table summarizes the changes in accumulated other comprehensive income (loss) by component, net of tax, for the periods indicated:


	Three Months Ended June 30,
	Unrealized holding gains (losses) on AFS securities		Unrealized holding losses on SERP		Unrealized holding gains (losses) on junior subordinated debt		Impairment loss on securities		Total
	(in millions)
Balance, March 31, 2023	$	(594.3)	$	(0.3)	$	1.9	$	1.2	$	(591.5)
Other comprehensive (loss) income before reclassifications	(34.2)		—		5.0		—		(29.2)
Amounts reclassified from AOCI	10.2		—		—		—		10.2
Net current-period other comprehensive (loss) income	(24.0)		—		5.0		—		(19.0)
Balance, June 30, 2023	$	(618.3)	$	(0.3)	$	6.9	$	1.2	$	(610.5)

Balance, March 31, 2022	$	(236.3)	$	(0.3)	$	1.5	$	—	$	(235.1)
Other comprehensive (loss) income before reclassifications	(284.5)		—		2.0		—		(282.5)
Amounts reclassified from AOCI	(0.3)		—		—		—		(0.3)
Net current-period other comprehensive (loss) income	(284.8)		—		2.0		—		(282.8)
Balance, June 30, 2022	$	(521.1)	$	(0.3)	$	3.5	$	—	$	(517.9)

	Six Months Ended June 30,
	Unrealized holding gains (losses) on AFS securities		Unrealized holding losses on SERP		Unrealized holding gains (losses) on junior subordinated debt		Impairment loss on securities		Total
	(in millions)
Balance, December 31, 2022	$	(663.7)	$	(0.3)	$	3.0	$	—	$	(661.0)
Other comprehensive income before reclassifications	25.9		—		3.9		1.2		31.0
Amounts reclassified from AOCI	19.5		—		—		—		19.5
Net current-period other comprehensive income	45.4		—		3.9		1.2		50.5
Balance, June 30, 2023	$	(618.3)	$	(0.3)	$	6.9	$	1.2	$	(610.5)

Balance, December 31, 2021	$	16.7	$	(0.3)	$	(0.7)	$	—	$	15.7
Other comprehensive (loss) income before reclassifications	(532.4)		—		4.2		—		(528.2)
Amounts reclassified from AOCI	(5.4)		—		—		—		(5.4)
Net current-period other comprehensive (loss) income	(537.8)		—		4.2		—		(533.6)
Balance, June 30, 2022	$	(521.1)	$	(0.3)	$	3.5	$	—	$	(517.9)

Derivatives and Hedging

3 Months Ended

Jun. 30, 2023

Derivative Instruments and Hedging Activities Disclosure [Abstract]

Derivatives and Hedging Activities

11. DERIVATIVES AND HEDGING ACTIVITIES

The Company is a party to various derivative instruments. The primary types of derivatives that the Company uses are interest rate contracts, forward purchase and sale commitments, and interest rate futures. Generally, these instruments are used to help manage the Company's exposure to interest rate risk related to IRLCs and its inventory of loans HFS and MSRs and also to meet client financing and hedging needs.

Derivatives are recorded at fair value on the Consolidated Balance Sheets, after taking into account the effects of bilateral collateral and master netting agreements. These agreements allow the Company to settle all derivative contracts held with the same counterparty on a net basis, and to offset net derivative positions with related cash collateral, where applicable.

Derivatives Designated in Hedge Relationships

The Company utilizes derivatives that have been designated as part of a hedge relationship in accordance with the applicable accounting guidance to minimize the exposure to changes in benchmark interest rates and volatility of net interest income and EVE to interest rate fluctuations. The primary derivative instruments used to manage interest rate risk are interest rate swaps, which convert the contractual interest rate index of agreed-upon amounts of assets and liabilities (i.e., notional amounts) from either a fixed rate to a variable rate, or from a variable rate to a fixed rate.

The Company has pay fixed/receive variable interest rate swaps designated as fair value hedges of certain fixed rate loans. As a result, the Company receives variable-rate interest payments in exchange for making fixed-rate payments over the lives of the contracts without exchanging the notional amounts. The variable-rate interest payments are based on LIBOR and converted to SOFR plus a spread adjustment upon the discontinuation of LIBOR in June 2023.

The Company also has pay fixed/receive variable interest rate swaps, designated as fair value hedges using the portfolio layer method to manage the exposure to changes in fair value associated with fixed rate loans, resulting from changes in the designated benchmark interest rate (federal funds rate). These portfolio layer hedges provide the Company the ability to execute a fair value hedge of the interest rate risk associated with a portfolio of similar prepayable assets. Under these interest rate swap contracts, the Company receives a variable rate based on SOFR and pays a fixed rate on the outstanding notional amount.

The Company also had pay fixed/receive variable interest rate swaps, designated as fair value hedges using the last-of-layer method. Upon termination of these last-of-layer hedges in 2022, the cumulative basis adjustment on these hedges was allocated across the remaining loan pool and is being amortized over the remaining term. At June 30, 2023, the remaining cumulative basis adjustment on the terminated last-of-layer hedges totaled $15 million.

Derivatives Not Designated in Hedge Relationships

Management enters into certain foreign exchange derivative contracts, back-to-back interest rate contracts, and risk participation agreements which are not designated as accounting hedges. Foreign exchange derivative contracts include spot, forward, forward window, and swap contracts. The purpose of these derivative contracts is to mitigate foreign currency risk on transactions entered into, or on behalf of customers. Contracts with customers, along with the related derivative trades that the Company places, are both remeasured at fair value, and are referred to as economic hedges since they economically offset the Company's exposure. The Company's back-to-back interest rate contracts are used to allow customers to manage long-term interest rate risk. Risk participation agreements are entered into with lead banks in certain loan syndications to share in the risk of default on interest rate swaps on the participated loan.

The Company also uses derivative financial instruments to manage exposure to interest rate risk within its mortgage banking business related to IRLCs and its inventory of loans HFS and MSRs. The Company economically hedges the changes in fair value associated with changes in interest rates generally by utilizing forward sale commitments, interest rate futures and interest rate swaps.

Fair Value Hedges

As of June 30, 2023 and December 31, 2022, the following amounts are reflected on the Consolidated Balance Sheets related to cumulative basis adjustments for outstanding fair value hedges:


	June 30, 2023				December 31, 2022
	Carrying Value of Hedged Assets/(Liabilities)		Cumulative Fair Value Hedging Adjustment (1)		Carrying Value of Hedged Assets/(Liabilities)		Cumulative Fair Value Hedging Adjustment (1)
	(in millions)
Loans HFI, net of deferred loan fees and costs (2)	$	3,934	$	52	$	447	$	17

(1)Included in the carrying value of the hedged assets/(liabilities).

(2)As of June 30, 2023, included portfolio layer method derivative instruments with $3.5 billion designated as the hedged amount (from a closed portfolio of prepayable fixed rate loans with a carrying value of $6.8 billion). The cumulative basis adjustment included in the carrying value of these hedged items totaled $29 million.

For the Company's derivative instruments that are designated and qualify as fair value hedges, the gain or loss on the derivative instrument as well as the offsetting loss or gain on the hedged item attributable to the hedged risk are recognized in current period earnings. The loss or gain on the hedged item is recognized in the same line item as the offsetting loss or gain on the related interest rate swaps. For loans, the gain or loss on the hedged item is included in interest income, as shown in the table below.


	Three Months Ended June 30,
	2023				2022
Income Statement Classification	Gain/(Loss) on Swaps		Gain/(Loss) on Hedged Item		Gain/(Loss) on Swaps		Gain/(Loss) on Hedged Item
	(in millions)
Interest income	$	39.0	$	(39.0)	$	15.2	$	(15.2)


	Six Months Ended June 30,
	2023				2022
Income Statement Classification	Gain/(Loss) on Swaps		Gain/(Loss) on Hedged Item		Gain/(Loss) on Swaps		Gain/(Loss) on Hedged Item
	(in millions)
Interest income	$	34.7	$	(34.7)	$	48.7	$	(48.7)

In addition to the gains and losses on the Company's outstanding fair value hedges presented in the above table, the Company recognized $2.9 million and $5.9 million in interest income related to the amortization of the cumulative basis adjustment on its discontinued last-of-layer hedges during the three and six months ended June 30, 2023, respectively.

Fair Values, Volume of Activity, and Gain/Loss Information Related to Derivative Instruments

The following table summarizes the fair value of the Company's derivative instruments on a gross basis as of June 30, 2023, December 31, 2022, and June 30, 2022. The change in the notional amounts of these derivatives from June 30, 2022 to June 30, 2023 indicates the volume of the Company's derivative transaction activity during these periods. The derivative asset and liability balances are presented on a gross basis, prior to the application of bilateral collateral and master netting agreements. Total derivative assets and liabilities are adjusted to take into account the impact of legally enforceable master netting agreements that allow the Company to settle all derivative contracts with the same counterparty on a net basis and to offset the net derivative position with the related cash collateral. Where master netting agreements are not in effect or are not enforceable under bankruptcy laws, the Company does not adjust those derivative amounts with counterparties.


	June 30, 2023						December 31, 2022						June 30, 2022
			Fair Value						Fair Value						Fair Value
	Notional Amount		Derivative Assets		Derivative Liabilities		Notional Amount		Derivative Assets		Derivative Liabilities		Notional Amount		Derivative Assets		Derivative Liabilities
	(in millions)
Derivatives designated as hedging instruments:
Fair value hedges
Interest rate contracts	$	4,033	$	56	$	4	$	476	$	18	$	—	$	500	$	5	$	11
Total	$	4,033	$	56	$	4	$	476	$	18	$	—	$	500	$	5	$	11

Derivatives not designated as hedging instruments (1):
Foreign currency contracts	$	71	$	1	$	1	$	250	$	1	$	9	$	138	$	1	$	—
Forward purchase contracts	4,484		1		16		2,709		1		13		4,764		32		10
Forward sales contracts	7,279		26		2		4,985		16		8		9,621		35		35
Futures purchase contracts (2), (3)	200		—		—		—		—		—		700		—		—
Futures sales contracts (2), (3)	12,210		—		—		8,706		—		—		6,072		—		—
Interest rate lock commitments	2,331		6		4		1,459		5		3		2,819		15		3
Interest rate contracts	2,424		14		14		1,538		6		6		64		—		—

Risk participation agreements	44		—		—		48		—		—		—		—		—
Total	$	29,043	$	48	$	37	$	19,695	$	29	$	39	$	24,178	$	83	$	48
Margin			85		12				4		1				(9)		24
Total, including margin	$	29,043	$	133	$	49	$	19,695	$	33	$	40	$	24,178	$	74	$	72

(1)Relate to economic hedging arrangements.

(2)The Company enters into forward purchase and sales contracts that are subject to daily remargining and almost all of which are based on three-month SOFR to hedge against its MSR valuation exposure. The notional amount on these contracts is substantial as these contracts have a duration of only 0.25 years and are intended to cover the longer duration of MSR hedges.

(3)The notional amounts previously reported for December 31, 2022 and June 30, 2022 have been adjusted in the current period to account for the impact of offsetting contracts. To close a futures contract prior to settlement, the Company purchases an offsetting future with the same terms as the original contract and these contracts no longer require settlement.

The fair value of derivative contracts, after taking into account the effects of master netting agreements, is included in other assets or other liabilities on the Consolidated Balance Sheets, as summarized in the table below:


	June 30, 2023						December 31, 2022						June 30, 2022
	Gross amount of recognized assets (liabilities)		Gross offset		Net assets (liabilities)		Gross amount of recognized assets (liabilities)		Gross offset		Net assets (liabilities)		Gross amount of recognized assets (liabilities)		Gross offset		Net assets (liabilities)
	(in millions)
Derivatives subject to master netting arrangements:
Assets
Forward purchase contracts	$	1	$	—	$	1	$	1	$	—	$	1	$	31	$	—	$	31
Forward sales contracts	26		—		26		13		—		13		33		—		33
Interest rate contracts	70		—		70		18		—		18		5		—		5
Margin	85		—		85		4		—		4		(9)		—		(9)
Netting	—		(28)		(28)		—		(17)		(17)		—		(55)		(55)
	$	182	$	(28)	$	154	$	36	$	(17)	$	19	$	60	$	(55)	$	5
Liabilities
Forward purchase contracts	$	(16)	$	—	$	(16)	$	(12)	$	—	$	(12)	$	(10)	$	—	$	(10)
Forward sales contracts	(2)		—		(2)		(8)		—		(8)		(34)		—		(34)
Interest rate contracts	(4)		—		(4)		—		—		—		(11)		—		(11)
Margin	(12)		—		(12)		(1)		—		(1)		(24)		—		(24)
Netting	—		28		28		—		17		17		—		55		55
	$	(34)	$	28	$	(6)	$	(21)	$	17	$	(4)	$	(79)	$	55	$	(24)
Derivatives not subject to master netting arrangements:
Assets
Foreign currency contracts	$	1	$	—	$	1	$	1	$	—	$	1	$	1	$	—	$	1
Forward purchase contracts	—		—		—		—		—		—		1		—		1
Forward sales contracts	—		—		—		3		—		3		2		—		2
Interest rate lock commitments	6		—		6		5		—		5		15		—		15
Interest rate contracts	—		—		—		6		—		6		—		—		—

	$	7	$	—	$	7	$	15	$	—	$	15	$	19	$	—	$	19
Liabilities
Foreign currency contracts	$	(1)	$	—	$	(1)	$	(9)	$	—	$	(9)	$	—	$	—	$	—
Forward purchase contracts	—		—		—		(1)		—		(1)		—		—		—
Forward sales contracts	—		—		—		—		—		—		(1)		—		(1)
Interest rate lock commitments	(4)		—		(4)		(3)		—		(3)		(3)		—		(3)
Interest rate contracts	(14)		—		(14)		(6)		—		(6)		—		—		—
	$	(19)	$	—	$	(19)	$	(19)	$	—	$	(19)	$	(4)	$	—	$	(4)
Total derivatives and margin
Assets	$	189	$	(28)	$	161	$	51	$	(17)	$	34	$	79	$	(55)	$	24
Liabilities	$	(53)	$	28	$	(25)	$	(40)	$	17	$	(23)	$	(83)	$	55	$	(28)

The following table summarizes the net gain (loss) on derivatives included in income:


	Three Months Ended June 30,				Six Months Ended June 30,
	2023		2022		2023		2022
	(in millions)
Net gain (loss) on loan origination and sale activities:
Interest rate lock commitments	$	(11.1)	$	23.2	$	0.3	$	2.4
Forward contracts	55.6		101.0		18.8		342.3

Interest rate swaps	(4.6)		—		(3.3)		—
Other contracts	2.2		(6.1)		1.8		(9.8)
Total gain	$	42.1	$	118.1	$	17.6	$	334.9
Net loan servicing revenue:
Forward contracts	$	(13.2)	$	(8.0)	$	(14.7)	$	(42.9)

Futures contracts	18.7		(21.9)		14.7		(43.9)
Interest rate swaps	(36.5)		—		(17.6)		—
Total loss	$	(31.0)	$	(29.9)	$	(17.6)	$	(86.8)

Counterparty Credit Risk

Like other financial instruments, derivatives contain an element of credit risk. This risk is measured as the expected replacement value of the contracts. Management enters into bilateral collateral and master netting agreements that provide for the net settlement of all contracts with the same counterparty. Additionally, management monitors counterparty credit risk exposure on each contract to determine appropriate limits on the Company's total credit exposure across all product types, which may require the Company to post collateral to counterparties when these contracts are in a net liability position and conversely, for counterparties to post collateral to the Company when these contracts are in a net asset position. Management reviews the Company's collateral positions on a daily basis and exchanges collateral with counterparties in accordance with standard ISDA documentation and other related agreements. The Company generally posts or holds collateral in the form of cash deposits or highly rated securities issued by the U.S. Treasury or government-sponsored enterprises (FNMA, and FHLMC), or guaranteed by GNMA. At June 30, 2023, December 31, 2022, and June 30, 2022 collateral pledged by the Company to counterparties for its derivatives totaled $90 million, $11 million, and $30 million, respectively.

Earnings per Share

6 Months Ended

Jun. 30, 2023

Earnings Per Share [Abstract]

Earnings Per Share

Diluted EPS is calculated using the weighted average outstanding common shares during the period, including common stock equivalents. Basic EPS is calculated using the weighted average outstanding common shares during the period.

The following table presents the calculation of basic and diluted EPS and summarizes the weighted average common shares excluded from the diluted EPS calculation due to their antidilutive effect:


	Three Months Ended June 30,				Six Months Ended June 30,
	2023		2022		2023		2022
	(in millions, except per share amounts)
Weighted average shares - basic	108.3		107.3		108.2		106.7
Dilutive effect of stock awards	—		0.4		0.1		0.4
Weighted average shares - diluted	108.3		107.7		108.3		107.1
Net income available to common stockholders	$	212.5	$	257.0	$	351.5	$	493.9

Earnings per Common Share:
Basic	$	1.96	$	2.40	$	3.25	$	4.63
Diluted	1.96		2.39		3.24		4.61

Antidilutive restricted stock outstanding	0.4		—		0.2		—

Income Taxes	6 Months Ended
Income Taxes	Jun. 30, 2023
Income Tax Disclosure [Abstract]
Income Taxes	The Company's effective tax rate was 17.1% and 19.6% for the three months ended June 30, 2023 and 2022, respectively. For each of the six months ended June 30, 2023 and 2022, the Company's effective tax rate was 19.5%. The decrease in the three-month effective tax rate was primarily due to increases in expected LIHTC benefits during 2023. As of June 30, 2023, the net DTA balance totaled $315 million. There was not a significant change in the net deferred tax asset of $311 million at December 31, 2022 as decreases to MSR DTLs were offset by increases in the fair market value of AFS securities and decreases to the accrued bonus DTA. Although realization is not assured, the Company believes that the realization of the recognized deferred tax asset of $315 million at June 30, 2023 is more-likely-than-not based on expectations as to future taxable income and based on available tax planning strategies that could be implemented if necessary to prevent a carryover from expiring. At June 30, 2023 and December 31, 2022, the Company had no deferred tax valuation allowance. LIHTC and renewable energy projects The Company holds ownership interests in limited partnerships and limited liability companies that invest in affordable housing and renewable energy projects. These investments are designed to generate a return primarily through the realization of federal tax credits and deductions. The limited liability entities are considered to be VIEs; however, as a limited partner, the Company is not the primary beneficiary and is not required to consolidate these entities. Investments in LIHTC and renewable energy totaled $596 million and $624 million as of June 30, 2023 and December 31, 2022, respectively. Unfunded LIHTC and renewable energy obligations are included in Other liabilities on the Consolidated Balance Sheet and totaled $338 million and $398 million as of June 30, 2023 and December 31, 2022, respectively. For the three months ended June 30, 2023 and 2022, $27.7 million and $15.4 million, respectively, of amortization related to LIHTC investments was recognized as a component of income tax expense.

The entire disclosure for income taxes. Disclosures may include net deferred tax liability or asset recognized in an enterprise's statement of financial position, net change during the year in the total valuation allowance, approximate tax effect of each type of temporary difference and carryforward that gives rise to a significant portion of deferred tax liabilities and deferred tax assets, utilization of a tax carryback, and tax uncertainties information.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 946
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 13
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480990/946-20-50-13

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 235
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-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.4-08(h)(2))
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Reference 3: http://www.xbrl.org/2003/role/disclosureRef
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Reference 4: http://www.xbrl.org/2003/role/disclosureRef
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Reference 5: http://www.xbrl.org/2003/role/disclosureRef
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Reference 6: http://www.xbrl.org/2003/role/disclosureRef
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-Paragraph 1
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Reference 7: http://www.xbrl.org/2003/role/disclosureRef
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Reference 8: http://www.xbrl.org/2003/role/disclosureRef
-Topic 740
-SubTopic 10
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-Paragraph 1
-Subparagraph (SAB TOPIC 6.I.5.Q1)
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Reference 9: http://www.xbrl.org/2003/role/disclosureRef
-Topic 740
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-Name Accounting Standards Codification
-Section S99
-Paragraph 2
-Subparagraph (SAB Topic 11.C)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147479360/740-10-S99-2

Reference 10: http://www.xbrl.org/2003/role/disclosureRef
-Topic 740
-SubTopic 30
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482603/740-30-50-2

Segments	6 Months Ended
Segments	Jun. 30, 2023
Segment Reporting [Abstract]
Segments	The Company's reportable segments are aggregated with a focus on products and services offered and consist of three reportable segments: •Commercial: provides commercial banking and treasury management products and services to small and middle-market businesses, specialized banking services to sophisticated commercial institutions and investors within niche industries, as well as financial services to the real estate industry. •Consumer Related: offers both commercial banking services to enterprises in consumer-related sectors and consumer banking services, such as residential mortgage banking. •Corporate & Other: consists of the Company's investment portfolio, Corporate borrowings and other related items, income and expense items not allocated to other reportable segments, and inter-segment eliminations. The Company's segment reporting process begins with the assignment of all loan and deposit accounts directly to the segments where these products are originated and/or serviced. Equity capital is assigned to each segment based on the risk profile of their assets and liabilities. With the exception of goodwill, which is assigned a 100% weighting, equity capital allocations ranged from 0% to 20% during the year. Any excess or deficient equity not allocated to segments based on risk is assigned to the Corporate & Other segment. Net interest income, provision for credit losses, and non-interest expense amounts are recorded in their respective segments to the extent that the amounts are directly attributable to those segments. Net interest income is recorded in each segment on a TEB with a corresponding increase in income tax expense, which is eliminated in the Corporate & Other segment. Further, net interest income of a reportable segment includes a funds transfer pricing process that matches assets and liabilities with similar interest rate sensitivity and maturity characteristics. Using this funds transfer pricing methodology, liquidity is transferred between users and providers. A net user of funds has lending/investing in excess of deposits/borrowings and a net provider of funds has deposits/borrowings in excess of lending/investing. A segment that is a user of funds is charged for the use of funds, while a provider of funds is credited through funds transfer pricing, which is determined based on the average estimated life of the assets or liabilities in the portfolio. Residual funds transfer pricing mismatches are allocable to the Corporate & Other segment and presented in net interest income. The net income amount for each reportable segment is further derived by the use of expense allocations. Certain expenses not directly attributable to a specific segment are allocated across all segments based on key metrics, such as number of employees, number of transactions processed for loans and deposits, and average loan and deposit balances. These types of expenses include information technology, operations, human resources, finance, risk management, credit administration, legal, and marketing. Income taxes are applied to each segment based on estimated effective tax rates. Any difference in the corporate tax rate and the aggregate effective tax rates in the segments are adjusted in the Corporate & Other segment. The following is a summary of operating segment information for the periods indicated:

The entire disclosure for reporting segments including data and tables. Reportable segments include those that meet any of the following quantitative thresholds a) it's reported revenue, including sales to external customers and intersegment sales or transfers is 10 percent or more of the combined revenue, internal and external, of all operating segments b) the absolute amount of its reported profit or loss is 10 percent or more of the greater, in absolute amount of 1) the combined reported profit of all operating segments that did not report a loss or 2) the combined reported loss of all operating segments that did report a loss c) its assets are 10 percent or more of the combined assets of all operating segments.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 280
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 22
-Publisher FASB
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Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 280
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-Name Accounting Standards Codification
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-Publisher FASB
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Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Topic 280
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Reference 4: http://www.xbrl.org/2003/role/disclosureRef
-Topic 280
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-Subparagraph (d)
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Reference 5: http://www.xbrl.org/2003/role/disclosureRef
-Topic 280
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Reference 6: http://www.xbrl.org/2003/role/disclosureRef
-Topic 280
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-Subparagraph (f)
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Reference 7: http://www.xbrl.org/2003/role/disclosureRef
-Topic 280
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Reference 8: http://www.xbrl.org/2003/role/disclosureRef
-Topic 280
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Reference 9: http://www.xbrl.org/2003/role/disclosureRef
-Topic 280
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-Section 50
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-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482810/280-10-50-26

Reference 10: http://www.xbrl.org/2003/role/disclosureRef
-Topic 280
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-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482810/280-10-50-34

Reference 11: http://www.xbrl.org/2003/role/disclosureRef
-Topic 280
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-Name Accounting Standards Codification
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-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482810/280-10-50-41

Reference 12: http://www.xbrl.org/2003/role/disclosureRef
-Topic 280
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-Name Accounting Standards Codification
-Section 50
-Paragraph 21
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482810/280-10-50-21

Reference 13: http://www.xbrl.org/2003/role/disclosureRef
-Topic 280
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 21
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482810/280-10-50-21

Reference 14: http://www.xbrl.org/2003/role/disclosureRef
-Topic 280
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-Name Accounting Standards Codification
-Section 50
-Paragraph 32
-Subparagraph (e)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482810/280-10-50-32

Investments, Debt and Equity Securities [Abstract]

Summary of Significant Accounting Policies (Policies)	6 Months Ended
Summary of Significant Accounting Policies (Policies)	Jun. 30, 2023
Accounting Policies [Abstract]
Nature of Operation	Nature of operations WAL is a bank holding company headquartered in Phoenix, Arizona, incorporated under the laws of the state of Delaware. WAL provides a full spectrum of customized loan, deposit, and treasury management capabilities, including 24/7 funds transfer and other digital payment offerings through its wholly-owned banking subsidiary, WAB. WAB operates the following full-service banking divisions: ABA, BON, FIB, Bridge, and TPB. The Company also serves business customers through a national platform of specialized financial services, including mortgage banking services through AmeriHome, and digital payment services for the class action legal industry through DST. In addition, the Company has the following non-bank subsidiaries: CSI, a captive insurance company formed and licensed under the laws of the State of Arizona and established as part of the Company's overall enterprise risk management strategy, and WATC, which provides corporate trust services and levered loan administration solutions.
Basis of Presentation	Basis of presentation The accompanying Unaudited Consolidated Financial Statements as of June 30, 2023 and for the three and six months ended June 30, 2023 and 2022 have been prepared in accordance with GAAP for interim financial information and Article 10 of Regulation S-X and, therefore, do not include all of the information and footnotes required by GAAP for complete financial statements. Accordingly, these statements should be read in conjunction with the Company's audited Consolidated Financial Statements included in the Company's Annual Report on Form 10-K for the year ended December 31, 2022. The accounts of the Company and its consolidated subsidiaries are included in the Consolidated Financial Statements. The information furnished in these interim statements reflects all adjustments that are, in the opinion of management, necessary for a fair statement of the results for each respective period presented. Such adjustments are of a normal, recurring nature. The results of operations in the interim statements are not necessarily indicative of the results that may be expected for any other quarter or for the full year.
Recent Accounting Pronouncements	Recent accounting pronouncements Accounting for Investments in Tax Credit Structures Using the Proportional Amortization Method In March 2023, the FASB issued guidance within ASU 2023-02, Investments — Equity Method and Joint Ventures (Topic 323). The amendments in this update permit entities to elect to account for tax equity investments, regardless of the tax credit program from which the income tax credits are received, using the proportional amortization method if certain conditions are met. Previously this option was only permitted for LIHTC investments. Additionally, the amendments in this update require that all tax equity investments accounted for using the proportional amortization method apply the delayed equity contribution guidance in Subtopic 323-740 and disclosure of the nature of an entity's tax equity investments and their effect on an entity's financial position and results of operations. The amendments in this update are effective for fiscal years beginning after December 15, 2023, including interim periods within those fiscal years and are applied on a modified retrospective or a retrospective basis. The adoption of this guidance is not expected to have a material impact on the Company's Consolidated Financial Statements. Recently adopted accounting guidance Troubled Debt Restructurings and Vintage Disclosures In March 2022, the FASB issued guidance within ASU 2022-02, Financial Instruments—Credit Losses (Topic 326). The amendments in this update eliminate the accounting guidance and related disclosures for TDRs by creditors in Subtopic 310-40, Receivables—Troubled Debt Restructurings by Creditors, while enhancing disclosure requirements for certain loan refinancings and restructurings by creditors when a borrower is experiencing financial difficulty and requiring an entity to disclose current-period gross write-offs by year of origination for financing receivables and net investments in leases within the scope of Subtopic 326-20, Financial Instruments—Credit Losses—Measured at Amortized Cost. The Company adopted this accounting guidance prospectively on January 1, 2023. The adoption of this guidance did not have a material impact on the Company's Consolidated Financial Statements.
Use of Estimates	Use of estimatesThe preparation of financial statements in conformity with GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosures of contingent assets and liabilities at the date of the financial statements and the reported amounts of revenues and expenses during the reporting period. Management's estimates and judgments are ongoing and are based on experience, current and expected future conditions, third-party evaluations and various other assumptions that management believes are reasonable under the circumstances. The results of these estimates form the basis for making judgments about the carrying values of assets and liabilities, as well as identifying and assessing the accounting treatment with respect to commitments and contingencies. Actual results may differ from those estimates and assumptions used in the Consolidated Financial Statements and related notes. Material estimates that are susceptible to significant changes in the near term relate to: 1) the determination of the ACL; 2) certain assets and liabilities carried at fair value; and 3) accounting for income taxes.
Principles of Consolidation	Principles of consolidation As of June 30, 2023, WAL has the following significant wholly-owned subsidiaries: WAB and eight unconsolidated subsidiaries used as business trusts in connection with the issuance of trust-preferred securities. WAB has the following significant wholly-owned subsidiaries: 1) WABT, which holds certain investment securities, municipal and nonprofit loans, and leases; 2) WA PWI, which holds interests in certain limited partnerships invested primarily in low income housing tax credits and small business investment corporations; 3) Helios Prime, which holds interests in certain limited partnerships invested in renewable energy projects; 4) BW Real Estate, Inc., which operates as a real estate investment trust and holds certain of WAB's real estate loans and related securities; and 5) Western Finance Company, which purchases and originates equipment finance leases and provides mortgage banking services through its wholly-owned subsidiary, AmeriHome. The Company does not have any other significant entities that should be consolidated. All significant intercompany balances and transactions have been eliminated in consolidation.
Reclassifications	ReclassificationsCertain amounts in the Consolidated Income Statements for the prior periods have been reclassified to conform to the current presentation. The reclassifications had no effect on net income or stockholders’ equity as previously reported.

Investment Securities (Tables)

6 Months Ended

Jun. 30, 2023

Debt Securities, Held-to-maturity, Allowance for Credit Loss [Table Text Block]


	Three Months Ended June 30, 2023
	Balance, March 31, 2023		Provision for Credit Losses		Charge-offs		Recoveries		Balance, June 30, 2023
	(in millions)
Held-to-maturity debt securities
Tax-exempt	$	6.5	$	(0.5)	$	—	$	—	$	6.0


	Six Months Ended June 30, 2023
	Balance, December 31, 2022		Provision for Credit Losses		Charge-offs		Recoveries		Balance, June 30, 2023
	(in millions)
Held-to-maturity debt securities
Tax-exempt	$	5.2	$	0.8	$	—	$	—	$	6.0


	Three Months Ended June 30, 2022:
	Balance, March 31, 2022		Provision for Credit Losses		Charge-offs		Recoveries		Balance June 30, 2022
	(in millions)
Held-to-maturity debt securities
Tax-exempt	$	3.2	$	—	$	—	$	—	$	3.2


	Six Months Ended June 30, 2022:
	Balance, December 31, 2021		Provision for Credit Losses		Charge-offs		Recoveries		Balance June 30, 2022
	(in millions)
Held-to-maturity debt securities
Tax-exempt	$	5.2	$	(2.0)	$	—	$	—	$	3.2

No allowance has been recognized on the Company's HTM private label residential MBS as losses are not expected due to the Company holding a senior position in these securities.

Carrying Amounts and Fair Values of Investment Securities

The carrying amounts and fair values of investment securities are summarized as follows:


	June 30, 2023
	Amortized Cost		Gross Unrealized Gains		Gross Unrealized (Losses)		Fair Value
	(in millions)
Held-to-maturity
Private label residential MBS	$	192	$	—	$	(40)	$	152
Tax-exempt	1,175		1		(142)		1,034
Total HTM securities	$	1,367	$	1	$	(182)	$	1,186

Available-for-sale debt securities
CLO	$	2,183	$	—	$	(39)	$	2,144
Commercial MBS issued by GSEs	69		—		(9)		60
Corporate debt securities	411		—		(73)		338

Private label residential MBS	1,371		—		(230)		1,141
Residential MBS issued by GSEs	2,141		—		(376)		1,765
Tax-exempt	919		—		(89)		830

U.S. Treasury securities	2,286		—		—		2,286
Other	74		3		(10)		67
Total AFS debt securities	$	9,454	$	3	$	(826)	$	8,631


	December 31, 2022
	Amortized Cost		Gross Unrealized Gains		Gross Unrealized (Losses)		Fair Value
	(in millions)
Held-to-maturity
Private label residential MBS	$	198	$	—	$	(39)	$	159
Tax-exempt	1,091		—		(138)		953
Total HTM securities	$	1,289	$	—	$	(177)	$	1,112

Available-for-sale debt securities
CLO	$	2,796	$	—	$	(90)	$	2,706
Commercial MBS issued by GSEs	104		1		(8)		97
Corporate debt securities	429		—		(39)		390

Private label residential MBS	1,442		—		(243)		1,199
Residential MBS issued by GSEs	2,123		—		(383)		1,740
Tax-exempt	1,004		2		(115)		891


Other	75		6		(12)		69
Total AFS debt securities	$	7,973	$	9	$	(890)	$	7,092

In addition, the Company held equity securities, which primarily consisted of preferred stock and CRA investments, with a fair value of $139 million and $160 million at June 30, 2023 and December 31, 2022, respectively. Unrealized gains on equity securities of $0.1 million and losses of $10.0 million for the three months ended June 30, 2023 and 2022, respectively, and losses of $8.4 million and $16.7 million for the six months ended June 30, 2023 and 2022, respectively, were recognized in earnings as a component of fair value loss adjustments.

Securities with carrying amounts of approximately $7.3 billion and $1.7 billion at June 30, 2023 and December 31, 2022, respectively, were pledged for various purposes as required or permitted by law.

Unrealized Losses and Fair Value of Investment Securities in Continuous Unrealized Loss Position

unrealized loss position, aggregated by major security type and length of time in a continuous unrealized loss position:


	June 30, 2023
	Less Than Twelve Months				More Than Twelve Months				Total
	Gross Unrealized Losses		Fair Value		Gross Unrealized Losses		Fair Value		Gross Unrealized Losses		Fair Value
	(in millions)




Available-for-sale debt securities
CLO	$	2	$	261	$	37	$	1,875	$	39	$	2,136
Commercial MBS issued by GSEs	1		12		8		45		9		57
Corporate debt securities (1)	2		15		71		320		73		335
Private label residential MBS	1		28		229		1,084		230		1,112
Residential MBS issued by GSEs	8		239		368		1,508		376		1,747
Tax-exempt	6		130		83		695		89		825


Other	2		18		8		36		10		54
Total AFS securities	$	22	$	703	$	804	$	5,563	$	826	$	6,266

(1)Includes securities with an ACL that have a fair value of $109 million and unrealized losses of $40 million.


	December 31, 2022
	Less Than Twelve Months				More Than Twelve Months				Total
	Gross Unrealized Losses		Fair Value		Gross Unrealized Losses		Fair Value		Gross Unrealized Losses		Fair Value
	(in millions)




Available-for-sale debt securities
CLO	$	81	$	2,467	$	9	$	216	$	90	$	2,683
Commercial MBS issued by GSEs	4		46		4		14		8		60
Corporate debt securities	28		263		11		120		39		383
Private label residential MBS	27		279		216		912		243		1,191
Residential MBS issued by GSEs	82		600		301		1,101		383		1,701
Tax-exempt	93		752		22		78		115		830


Other	4		26		8		26		12		52
Total AFS securities	$	319	$	4,433	$	571	$	2,467	$	890	$	6,900

Amortized Cost and Fair Value of Investment Securities by Contractual Maturities

A security is considered to be past due once it is 30 days contractually past due under the terms of the agreement. As of June 30, 2023, the Company did not have a significant amount of investment securities that were past due or on nonaccrual status.

The amortized cost and fair value of the Company's debt securities by contractual maturities are shown below. MBS are shown separately as individual MBS are comprised of pools of loans with varying maturities. Therefore, these securities are listed separately in the maturity summary.


	June 30, 2023
	Amortized Cost		Estimated Fair Value
	(in millions)
Held-to-maturity
Due in one year or less	$	22	$	22
After one year through five years	6		6
After five years through ten years	33		31
After ten years	1,114		975
Mortgage-backed securities	192		152
Total HTM securities	$	1,367	$	1,186

Available-for-sale
Due in one year or less	$	2,286	$	2,285
After one year through five years	166		149
After five years through ten years	898		832
After ten years	2,523		2,399
Mortgage-backed securities	3,581		2,966
Total AFS securities	$	9,454	$	8,631

Investment Securities by Credit Rating Type

The following tables summarize the carrying amount of the Company’s investment ratings position, which are updated quarterly and used to monitor the credit quality of the Company's securities:


	June 30, 2023
	AAA		Split-rated AAA/AA+		AA+ to AA-		A+ to A-		BBB+ to BBB-		BB+ and below		Unrated		Totals
	(in millions)
Held-to-maturity
Private label residential MBS	$	—	$	—	$	—	$	—	$	—	$	—	$	192	$	192
Tax-exempt	—		—		—		—		—		—		1,175		1,175
Total HTM securities (1)	$	—	$	—	$	—	$	—	$	—	$	—	$	1,367	$	1,367

Available-for-sale debt securities
CLO	$	120	$	—	$	1,960	$	64	$	—	$	—	$	—	$	2,144
Commercial MBS issued by GSEs	—		60		—		—		—		—		—		60
Corporate debt securities	—		—		—		70		219		49		—		338
Private label residential MBS	1,115		—		25		—		—		1		—		1,141
Residential MBS issued by GSEs	—		1,765		—		—		—		—		—		1,765
Tax-exempt	9		16		354		376		—		—		75		830

U.S. Treasury securities	—		2,286		—		—		—		—		—		2,286
Other	—		—		9		9		29		3		17		67
Total AFS securities (1)	$	1,244	$	4,127	$	2,348	$	519	$	248	$	53	$	92	$	8,631

Equity securities
Common stock	$	—	$	—	$	—	$	—	$	—	$	—	$	2	$	2
CRA investments	—		25		—		—		—		—		12		37
Preferred stock	—		—		—		—		53		37		10		100
Total equity securities (1)	$	—	$	25	$	—	$	—	$	53	$	37	$	24	$	139

(1)For rated securities, if ratings differ, the Company uses an average of the available ratings by major credit agencies.


	December 31, 2022
	AAA		Split-rated AAA/AA+		AA+ to AA-		A+ to A-		BBB+ to BBB-		BB+ and below		Unrated		Totals
	(in millions)
Held-to-maturity
Private label residential MBS	$	—	$	—	$	—	$	—	$	—	$	—	$	198	$	198
Tax-exempt	—		—		—		—		—		—		1,091		1,091
Total HTM securities (1)	$	—	$	—	$	—	$	—	$	—	$	—	$	1,289	$	1,289

Available-for-sale debt securities
CLO	$	310	$	—	$	2,121	$	275	$	—	$	—	$	—	$	2,706
Commercial MBS issued by GSEs	—		97		—		—		—		—		—		97
Corporate debt securities	—		—		—		74		316		—		—		390
Private label residential MBS	1,158		—		41		—		—		—		—		1,199
Residential MBS issued by GSEs	—		1,740		—		—		—		—		—		1,740
Tax-exempt	11		15		392		425		—		—		48		891


Other	—		—		9		9		27		6		18		69
Total AFS securities (1)	$	1,479	$	1,852	$	2,563	$	783	$	343	$	6	$	66	$	7,092

Equity securities
Common stock	$	—	$	—	$	—	$	—	$	—	$	—	$	3	$	3
CRA investments	—		24		—		—		—		—		25		49
Preferred stock	—		—		—		—		82		17		9		108
Total equity securities (1)	$	—	$	24	$	—	$	—	$	82	$	17	$	37	$	160

(1)For rated securities, if ratings differ, the Company uses an average of the available ratings by major credit agencies.

Loans, Leases and Allowance for Credit Losses (Tables)

6 Months Ended

Jun. 30, 2023

Receivables [Abstract]

Financing Receivable, Troubled Debt Restructuring [Table Text Block]

The following table presents TDR loans by loan portfolio segment:


	December 31, 2022
	Number of Loans	Recorded Investment





Other commercial and industrial	4	$	2
CRE - owner occupied	1	1
Hotel franchise finance	1	10
Other CRE - non-owner occupied	1	1




Total	7	$	14

Schedule of Held for Investment Loan Portfolio Composition of Loans, Leases and Allowance for Credit Losses

The composition of the Company's HFI loan portfolio is as follows:


	June 30, 2023		December 31, 2022
	(in millions)
Warehouse lending	$	5,549	$	5,561
Municipal & nonprofit	1,558		1,524
Tech & innovation	2,401		2,293
Equity fund resources	931		3,717
Other commercial and industrial	6,396		7,793
CRE - owner occupied	1,648		1,656
Hotel franchise finance	4,101		3,807
Other CRE - non-owner occupied	5,792		5,457
Residential	13,502		13,996
Residential - EBO	1,432		1,884
Construction and land development	4,403		3,995
Other	162		179
Total loans HFI	47,875		51,862
Allowance for credit losses	(321)		(310)
Total loans HFI, net of allowance	$	47,554	$	51,552

Contractual Aging of Loan Portfolio by Class of Loans Including Loans Held for Sale and Excluding Deferred Fees/Costs

The following table presents an aging analysis of past due loans by loan portfolio segment:


	June 30, 2023
	Current		30-59 Days Past Due		60-89 Days Past Due		Over 90 days Past Due		Total Past Due		Total
	(in millions)
Warehouse lending	$	5,549	$	—	$	—	$	—	$	—	$	5,549
Municipal & nonprofit	1,558		—		—		—		—		1,558
Tech & innovation	2,401		—		—		—		—		2,401
Equity fund resources	931		—		—		—		—		931
Other commercial and industrial	6,396		—		—		—		—		6,396
CRE - owner occupied	1,648		—		—		—		—		1,648
Hotel franchise finance	4,101		—		—		—		—		4,101
Other CRE - non-owner occupied	5,792		—		—		—		—		5,792
Residential	13,388		94		20		—		114		13,502
Residential - EBO	662		173		116		481		770		1,432
Construction and land development	4,396		7		—		—		7		4,403
Other	162		—		—		—		—		162
Total loans	$	46,984	$	274	$	136	$	481	$	891	$	47,875


	December 31, 2022
	Current		30-59 Days Past Due		60-89 Days Past Due		Over 90 days Past Due		Total Past Due		Total
	(in millions)
Warehouse lending	$	5,561	$	—	$	—	$	—	$	—	$	5,561
Municipal & nonprofit	1,524		—		—		—		—		1,524
Tech & innovation	2,270		23		—		—		23		2,293
Equity fund resources	3,717		—		—		—		—		3,717
Other commercial and industrial	7,791		2		—		—		2		7,793
CRE - owner occupied	1,656		—		—		—		—		1,656
Hotel franchise finance	3,807		—		—		—		—		3,807
Other CRE - non-owner occupied	5,454		3		—		—		3		5,457
Residential	13,955		37		4		—		41		13,996
Residential - EBO	969		217		116		582		915		1,884
Construction and land development	3,995		—		—		—		—		3,995
Other	178		1		—		—		1		179
Total loans	$	50,877	$	283	$	120	$	582	$	985	$	51,862

Summary of Recorded Investment in Nonaccrual Loans and Loans Past Due 90 Days Still Accruing Interest by Loan Class

Loans are placed on nonaccrual status when management determines that the full repayment of principal and collection of interest according to contractual terms is no longer likely, generally when the loan becomes 90 days or more past due.

The following tables present nonperforming loan balances by loan portfolio segment:


	June 30, 2023
	Nonaccrual with No Allowance for Credit Loss		Nonaccrual with an Allowance for Credit Loss		Total Nonaccrual		Loans Past Due 90 Days or More and Still Accruing
	(in millions)

Municipal & nonprofit	$	6	$	7	$	13	$	—
Tech & innovation	—		7		7		—

Other commercial and industrial	59		23		82		—
CRE - owner occupied	16		2		18		—

Other CRE - non-owner occupied	3		75		78		—
Residential	—		58		58		—
Residential - EBO	—		—		—		481


Total	$	84	$	172	$	256	$	481

Loans contractually delinquent by 90 days or more and still accruing totaled $481 million at June 30, 2023 and consisted of government guaranteed EBO residential loans.

Loans by Risk Rating

Credit Quality Indicators

The Company categorizes loans into risk categories based on relevant information about the ability of borrowers to service their debt such as current financial information, historical payment experience, credit documentation, public information, and current economic trends, among other factors. The Company analyzes loans individually to classify the loans as to credit risk. This analysis is performed on a quarterly basis. The following tables present risk ratings by loan portfolio segment and origination year. The origination year is the year of origination or renewal.


	Term Loan Amortized Cost Basis by Origination Year												Revolving Loans Amortized Cost Basis		Total
As of and for the six months ended June 30, 2023	2023		2022		2021		2020		2019		Prior
	(in millions)
Warehouse lending
Pass	$	387	$	248	$	320	$	293	$	—	$	—	$	4,301	$	5,549
Special mention	—		—		—		—		—		—		—		—
Classified	—		—		—		—		—		—		—		—
Total	$	387	$	248	$	320	$	293	$	—	$	—	$	4,301	$	5,549
Current period gross charge-offs	$	—	$	—	$	—	$	—	$	—	$	—	$	—	$	—

Municipal & nonprofit
Pass	$	25	$	131	$	187	$	186	$	71	$	927	$	—	$	1,527
Special mention	—		7		—		—		—		11		—		18
Classified	—		—		—		—		6		7		—		13
Total	$	25	$	138	$	187	$	186	$	77	$	945	$	—	$	1,558
Current period gross charge-offs	$	—	$	—	$	—	$	—	$	—	$	—	$	—	$	—

Tech & innovation
Pass	$	226	$	774	$	275	$	77	$	53	$	1	$	908	$	2,314
Special mention	12		32		—		6		—		—		17		67
Classified	6		5		6		3		—		—		—		20
Total	$	244	$	811	$	281	$	86	$	53	$	1	$	925	$	2,401
Current period gross charge-offs	$	2	$	—	$	—	$	—	$	—	$	—	$	—	$	2

Equity fund resources
Pass	$	116	$	89	$	48	$	3	$	12	$	4	$	659	$	931
Special mention	—		—		—		—		—		—		—		—
Classified	—		—		—		—		—		—		—		—
Total	$	116	$	89	$	48	$	3	$	12	$	4	$	659	$	931
Current period gross charge-offs	$	—	$	—	$	—	$	—	$	—	$	—	$	—	$	—

Other commercial and industrial
Pass	$	961	$	1,804	$	513	$	194	$	112	$	284	$	2,361	$	6,229
Special mention	19		47		15		—		—		—		—		81
Classified	—		27		47		3		1		1		7		86
Total	$	980	$	1,878	$	575	$	197	$	113	$	285	$	2,368	$	6,396
Current period gross charge-offs	$	—	$	3	$	6	$	4	$	—	$	—	$	—	$	13

CRE - owner occupied
Pass	$	57	$	349	$	359	$	169	$	142	$	510	$	35	$	1,621
Special mention	2		—		—		—		1		1		—		4
Classified	3		—		6		3		4		7		—		23
Total	$	62	$	349	$	365	$	172	$	147	$	518	$	35	$	1,648
Current period gross charge-offs	$	—	$	—	$	—	$	—	$	—	$	—	$	—	$	—

Hotel franchise finance
Pass	$	439	$	1,751	$	663	$	95	$	465	$	251	$	118	$	3,782
Special mention	—		—		40		—		40		21		—		101
Classified	27		9		20		26		112		24		—		218
Total	$	466	$	1,760	$	723	$	121	$	617	$	296	$	118	$	4,101
Current period gross charge-offs	$	—	$	—	$	—	$	—	$	—	$	—	$	—	$	—


	Term Loan Amortized Cost Basis by Origination Year												Revolving Loans Amortized Cost Basis		Total
As of and for the six months ended June 30, 2023	2023		2022		2021		2020		2019		Prior
	(in millions)

Other CRE - non-owner occupied
Pass	$	1,028	$	2,121	$	772	$	670	$	219	$	277	$	265	$	5,352
Special mention	16		150		72		38		29		—		1		306
Classified	—		—		96		—		14		4		20		134
Total	$	1,044	$	2,271	$	940	$	708	$	262	$	281	$	286	$	5,792
Current period gross charge-offs	$	—	$	—	$	2	$	—	$	—	$	—	$	—	$	2

Residential
Pass	$	177	$	3,687	$	8,207	$	847	$	284	$	215	$	27	$	13,444
Special mention	—		—		—		—		—		—		—		—
Classified	—		18		32		3		3		2		—		58
Total	$	177	$	3,705	$	8,239	$	850	$	287	$	217	$	27	$	13,502
Current period gross charge-offs	$	—	$	—	$	—	$	—	$	—	$	—	$	—	$	—

Residential - EBO
Pass	$	—	$	9	$	248	$	591	$	291	$	293	$	—	$	1,432
Special mention	—		—		—		—		—		—		—		—
Classified	—		—		—		—		—		—		—		—
Total	$	—	$	9	$	248	$	591	$	291	$	293	$	—	$	1,432
Current period gross charge-offs	$	—	$	—	$	—	$	—	$	—	$	—	$	—	$	—

Construction and land development
Pass	$	736	$	1,859	$	497	$	138	$	—	$	2	$	1,026	$	4,258
Special mention	—		—		5		112		—		—		—		117
Classified	—		—		28		—		—		—		—		28
Total	$	736	$	1,859	$	530	$	250	$	—	$	2	$	1,026	$	4,403
Current period gross charge-offs	$	—	$	—	$	—	$	—	$	—	$	—	$	—	$	—

Other
Pass	$	2	$	14	$	5	$	—	$	4	$	66	$	71	$	162
Special mention	—		—		—		—		—		—		—		—
Classified	—		—		—		—		—		—		—		—
Total	$	2	$	14	$	5	$	—	$	4	$	66	$	71	$	162
Current period gross charge-offs	$	—	$	—	$	—	$	—	$	—	$	—	$	—	$	—

Total by Risk Category
Pass	$	4,154	$	12,836	$	12,094	$	3,263	$	1,653	$	2,830	$	9,771	$	46,601
Special mention	49		236		132		156		70		33		18		694
Classified	36		59		235		38		140		45		27		580
Total	$	4,239	$	13,131	$	12,461	$	3,457	$	1,863	$	2,908	$	9,816	$	47,875
Current period gross charge-offs	$	2	$	3	$	8	$	4	$	—	$	—	$	—	$	17


	Term Loan Amortized Cost Basis by Origination Year												Revolving Loans Amortized Cost Basis		Total
December 31, 2022	2022		2021		2020		2019		2018		Prior
	(in millions)








Warehouse lending
Pass	$	397	$	41	$	152	$	—	$	—	$	—	$	4,928	$	5,518
Special mention	43		—		—		—		—		—		—		43
Classified	—		—		—		—		—		—		—		—
Total	$	440	$	41	$	152	$	—	$	—	$	—	$	4,928	$	5,561

Municipal & nonprofit
Pass	$	107	$	185	$	187	$	78	$	43	$	917	$	—	$	1,517
Special mention	—		—		—		—		—		—		—		—
Classified	—		—		—		—		—		7		—		7
Total	$	107	$	185	$	187	$	78	$	43	$	924	$	—	$	1,524

Tech & innovation
Pass	$	813	$	374	$	87	$	66	$	4	$	1	$	853	$	2,198
Special mention	36		22		3		—		—		—		20		81
Classified	2		12		—		—		—		—		—		14
Total	$	851	$	408	$	90	$	66	$	4	$	1	$	873	$	2,293

Equity fund resources
Pass	$	1,020	$	1,189	$	191	$	16	$	—	$	—	$	1,301	$	3,717
Special mention	—		—		—		—		—		—		—		—
Classified	—		—		—		—		—		—		—		—
Total	$	1,020	$	1,189	$	191	$	16	$	—	$	—	$	1,301	$	3,717

Other commercial and industrial
Pass	$	2,968	$	1,272	$	262	$	277	$	312	$	206	$	2,406	$	7,703
Special mention	—		44		—		—		—		—		3		47
Classified	3		21		10		3		3		1		2		43
Total	$	2,971	$	1,337	$	272	$	280	$	315	$	207	$	2,411	$	7,793

CRE - owner occupied
Pass	$	338	$	359	$	174	$	157	$	211	$	339	$	29	$	1,607
Special mention	—		—		—		—		—		1		—		1
Classified	—		14		7		1		5		10		11		48
Total	$	338	$	373	$	181	$	158	$	216	$	350	$	40	$	1,656









Hotel franchise finance
Pass	$	1,762	$	726	$	54	$	528	$	290	$	103	$	118	$	3,581
Special mention	—		—		26		—		—		—		—		26
Classified	18		20		—		117		45		—		—		200
Total	$	1,780	$	746	$	80	$	645	$	335	$	103	$	118	$	3,807

Other CRE - non-owner occupied
Pass	$	2,344	$	1,201	$	870	$	264	$	160	$	218	$	315	$	5,372
Special mention	3		38		—		12		—		—		1		54
Classified	—		4		—		12		10		5		—		31
Total	$	2,347	$	1,243	$	870	$	288	$	170	$	223	$	316	$	5,457

Residential
Pass	$	4,041	$	8,474	$	878	$	308	$	150	$	90	$	36	$	13,977
Special mention	—		—		—		—		—		—		—		—
Classified	6		9		—		3		1		—		—		19
Total	$	4,047	$	8,483	$	878	$	311	$	151	$	90	$	36	$	13,996

Residential - EBO
Pass	$	3	$	268	$	712	$	454	$	191	$	256	$	—	$	1,884
Special mention	—		—		—		—		—		—		—		—
Classified	—		—		—		—		—		—		—		—
Total	$	3	$	268	$	712	$	454	$	191	$	256	$	—	$	1,884


	Term Loan Amortized Cost Basis by Origination Year												Revolving Loans Amortized Cost Basis		Total
December 31, 2022	2022		2021		2020		2019		2018		Prior
	(in millions)
Construction and land development
Pass	$	1,533	$	815	$	273	$	14	$	—	$	—	$	1,258	$	3,893
Special mention	—		—		98		—		—		—		—		98
Classified	—		—		—		4		—		—		—		4
Total	$	1,533	$	815	$	371	$	18	$	—	$	—	$	1,258	$	3,995

Other
Pass	$	23	$	10	$	13	$	5	$	2	$	61	$	64	$	178
Special mention	—		—		—		—		—		1		—		1
Classified	—		—		—		—		—		—		—		—
Total	$	23	$	10	$	13	$	5	$	2	$	62	$	64	$	179

Total by Risk Category
Pass	$	15,349	$	14,914	$	3,853	$	2,167	$	1,363	$	2,191	$	11,308	$	51,145
Special mention	82		104		127		12		—		2		24		351
Classified	29		80		17		140		64		23		13		366
Total	$	15,460	$	15,098	$	3,997	$	2,319	$	1,427	$	2,216	$	11,345	$	51,862

Restructurings for Borrowers Experiencing Financial Difficulty

The Company adopted the amendments in ASU 2022-02, which eliminated accounting guidance on TDR loans for creditors and requires enhanced disclosures for loan modifications to borrowers experiencing financial difficulty that were made on or after January 1, 2023. See “Note 1. Summary of Significant Accounting Policies” of these Notes to Unaudited Financial Statements for further discussion of the amendments in this update.

The following table presents the amortized cost basis of loans HFI that were modified during the period by loan portfolio segment:


	Amortized Cost Basis at June 30, 2023
	Payment Delay and Term Extension		Term Extension		Payment Delay		Total		% of Total Class of Financing Receivable
Three Months Ended	(dollars in millions)




Other commercial and industrial	$	—	$	27	$	—	$	27	0.4	%

Hotel franchise finance	—		9		—		9		0.2



Construction and land development	—		28		—		28		0.6

Total	$	—	$	64	$	—	$	64	0.1	%


	Amortized Cost Basis at June 30, 2023
	Payment Delay and Term Extension		Term Extension		Payment Delay		Total		% of Total Class of Financing Receivable
Six Months Ended	(dollars in millions)


Tech & innovation	$	2	$	—	$	5	$	7	0.3	%

Other commercial and industrial	—		27		—		27		0.4

Hotel franchise finance	—		27		—		27		0.7

Residential	—		—		1		1		0.0

Construction and land development	—		28		—		28		0.6

Total	$	2	$	82	$	6	$	90	0.2	%

The performance of these modified loans is monitored for 12 months following the modification. As of June 30, 2023, modified loans on nonaccrual status totaled $35 million and the remaining $55 million were current with contractual payments.

In the normal course of business, the Company also modifies EBO loans, which are delinquent FHA, VA, or USDA insured or guaranteed loans repurchased under the terms of the GNMA MBS program and can be repooled or resold when loans are brought current. During the three and six months ended June 30, 2023, the Company completed modifications of EBO loans with an amortized cost of $35 million and $92 million, respectively. These modifications were largely payment delays and term extensions, or both.

Allowances for Credit Losses

The below tables reflect the activity in the ACL on loans HFI by loan portfolio segment, which includes an estimate of future recoveries:


	Three Months Ended June 30, 2023
	Balance, March 31, 2023		Provision for (Recovery of) Credit Losses		Charge-offs		Recoveries		Balance, June 30, 2023
	(in millions)
Warehouse lending	$	6.6	$	(1.4)	$	—	$	—	$	5.2
Municipal & nonprofit	18.4		(1.9)		—		—		16.5
Tech & innovation	36.4		(2.8)		—		—		33.6
Equity fund resources	3.3		(1.6)		—		—		1.7
Other commercial and industrial	51.1		5.9		6.0		(0.8)		51.8
CRE - owner occupied	8.6		(0.6)		—		—		8.0
Hotel franchise finance	47.7		(2.0)		—		—		45.7
Other CRE - non-owner occupied	66.4		25.9		2.2		—		90.1
Residential	31.7		2.2		—		—		33.9
Residential - EBO	—		—		—		—		—
Construction and land development	31.5		0.2		—		—		31.7
Other	3.0		(0.1)		—		—		2.9
Total	$	304.7	$	23.8	$	8.2	$	(0.8)	$	321.1


	Six Months Ended June 30, 2023
	Balance, December 31, 2022		Provision for (Recovery of) Credit Losses		Charge-offs		Recoveries		Balance, June 30, 2023
	(in millions)
Warehouse lending	$	8.4	$	(3.2)	$	—	$	—	$	5.2
Municipal & nonprofit	15.9		0.6		—		—		16.5
Tech & innovation	30.8		4.6		1.8		—		33.6
Equity fund resources	6.4		(4.7)		—		—		1.7
Other commercial and industrial	85.9		(24.8)		13.3		(4.0)		51.8
CRE - owner occupied	7.1		0.9		—		—		8.0
Hotel franchise finance	46.9		(1.2)		—		—		45.7
Other CRE - non-owner occupied	47.4		44.9		2.2		—		90.1
Residential	30.4		3.5		—		—		33.9
Residential - EBO	—		—		—		—		—
Construction and land development	27.4		4.3		—		—		31.7
Other	3.1		(0.1)		0.1		—		2.9
Total	$	309.7	$	24.8	$	17.4	$	(4.0)	$	321.1


	Three Months Ended June 30, 2022
	Balance, March 31, 2022		Provision for (Recovery of) Credit Losses		Charge-offs		Recoveries		Balance, June 30, 2022
	(in millions)
Warehouse lending	$	2.9	$	0.8	$	—	$	—	$	3.7
Municipal & nonprofit	13.4		0.2		—		—		13.6
Tech & innovation	28.0		(2.6)		—		—		25.4
Equity fund resources	6.6		7.4		—		—		14.0
Other commercial and industrial	115.7		5.1		2.3		(0.7)		119.2
CRE - owner occupied	8.1		(0.7)		—		(0.1)		7.5
Hotel franchise finance	30.6		3.2		—		—		33.8
Other CRE - non-owner occupied	15.3		6.8		—		—		22.1
Residential	23.8		(5.0)		—		—		18.8
Construction and land development	10.7		1.5		—		—		12.2
Other	2.5		0.3		0.1		(0.2)		2.9
Total	$	257.6	$	17.0	$	2.4	$	(1.0)	$	273.2


	Six Months Ended June 30, 2022
	Balance, December 31, 2021		Provision for (Recovery of) Credit Losses		Charge-offs		Recoveries		Balance, June 30, 2022
	(in millions)
Warehouse lending	$	3.0	$	0.7	$	—	$	—	$	3.7
Municipal & nonprofit	13.7		(0.1)		—		—		13.6
Tech & innovation	25.7		(2.3)		—		(2.0)		25.4
Equity fund resources	9.6		4.4		—		—		14.0
Other commercial and industrial	103.6		19.4		4.9		(1.1)		119.2
CRE - owner occupied	10.6		(3.2)		—		(0.1)		7.5
Hotel franchise finance	41.5		(7.7)		—		—		33.8
Other CRE - non-owner occupied	16.9		5.2		—		—		22.1
Residential	12.5		6.3		—		—		18.8
Construction and land development	12.5		(0.3)		—		—		12.2
Other	2.9		(0.1)		0.1		(0.2)		2.9
Total	$	252.5	$	22.3	$	5.0	$	(3.4)	$	273.2

Accrued interest receivable of $296 million and $304 million at June 30, 2023 and December 31, 2022, respectively, was excluded from the estimate of credit losses. Whereas, accrued interest receivable related to the Company's Residential-EBO loan portfolio segment was included in the estimate of credit losses and had an allowance of $6 million and $9 million, as of June 30, 2023 and December 31, 2022, respectively.

In addition to the ACL on funded loans HFI, the Company maintains a separate ACL related to off-balance sheet credit exposures, including unfunded loan commitments. This allowance is included in Other liabilities on the Consolidated Balance Sheets.

The below table reflects the activity in the ACL on unfunded loan commitments:


	Three Months Ended June 30,				Six Months Ended June 30,
	2023		2022		2023		2022
	(in millions)
Balance, beginning of period	$	44.8	$	43.3	$	47.0	$	37.6
Provision for credit losses	(3.7)		10.5		(5.9)		16.2
Balance, end of period	$	41.1	$	53.8	$	41.1	$	53.8

The following tables disaggregate the Company's ACL on funded loans HFI and loan balances by measurement methodology:


	June 30, 2023
	Loans						Allowance
	Collectively Evaluated for Credit Loss		Individually Evaluated for Credit Loss		Total		Collectively Evaluated for Credit Loss		Individually Evaluated for Credit Loss		Total
	(in millions)
Warehouse lending	$	5,549	$	—	$	5,549	$	5.2	$	—	$	5.2
Municipal & nonprofit	1,545		13		1,558		14.0		2.5		16.5
Tech & innovation	2,383		18		2,401		30.1		3.5		33.6
Equity fund resources	931		—		931		1.7		—		1.7
Other commercial and industrial	6,312		84		6,396		46.3		5.5		51.8
CRE - owner occupied	1,628		20		1,648		8.0		—		8.0
Hotel franchise finance	3,884		217		4,101		45.7		—		45.7
Other CRE - non-owner occupied	5,659		133		5,792		87.2		2.9		90.1
Residential	13,502		—		13,502		33.9		—		33.9
Residential EBO	1,432		—		1,432		—		—		—
Construction and land development	4,375		28		4,403		31.7		—		31.7
Other	162		—		162		2.9		—		2.9
Total	$	47,362	$	513	$	47,875	$	306.7	$	14.4	$	321.1


	December 31, 2022
	Loans						Allowance
	Collectively Evaluated for Credit Loss		Individually Evaluated for Credit Loss		Total		Collectively Evaluated for Credit Loss		Individually Evaluated for Credit Loss		Total
	(in millions)
Warehouse lending	$	5,561	$	—	$	5,561	$	8.4	$	—	$	8.4
Municipal & nonprofit	1,517		7		1,524		13.4		2.5		15.9
Tech & innovation	2,280		13		2,293		30.3		0.5		30.8
Equity fund resources	3,717		—		3,717		6.4		—		6.4
Other commercial and industrial	7,754		39		7,793		80.4		5.5		85.9
CRE - owner occupied	1,612		44		1,656		7.1		—		7.1
Hotel franchise finance	3,607		200		3,807		44.7		2.2		46.9
Other CRE - non-owner occupied	5,428		29		5,457		47.4		—		47.4
Residential	13,996		—		13,996		30.4		—		30.4
Residential EBO	1,884		—		1,884		—		—		—
Construction and land development	3,991		4		3,995		27.4		—		27.4
Other	179		—		179		3.1		—		3.1
Total	$	51,526	$	336	$	51,862	$	299.0	$	10.7	$	309.7

Other Borrowings (Tables)

6 Months Ended

Jun. 30, 2023

Debt Disclosure [Abstract]

Company's Borrowings

The following table summarizes the Company’s borrowings by type:


	June 30, 2023		December 31, 2022
	(in millions)
Short-Term:
Federal funds purchased	$	—	$	640
BTFP advances	1,300		—
FHLB advances	4,900		4,300
Warehouse borrowings	55		—
Repurchase agreements	2,482		27
Secured borrowings	62		25
Total short-term borrowings	$	8,799	$	4,992
Long-Term:

AmeriHome senior notes, net of fair value adjustment	$	314	$	315
Credit linked notes, net of debt issuance costs	454		992
Total long-term borrowings	$	768	$	1,307

Total other borrowings	$	9,567	$	6,299

Accumulated Other Comprehensive Income (Tables)

6 Months Ended

Jun. 30, 2023

Equity [Abstract]

Summary of Changes in Accumulated Other Comprehensive Income


	Three Months Ended June 30,
	Unrealized holding gains (losses) on AFS securities		Unrealized holding losses on SERP		Unrealized holding gains (losses) on junior subordinated debt		Impairment loss on securities		Total
	(in millions)
Balance, March 31, 2023	$	(594.3)	$	(0.3)	$	1.9	$	1.2	$	(591.5)
Other comprehensive (loss) income before reclassifications	(34.2)		—		5.0		—		(29.2)
Amounts reclassified from AOCI	10.2		—		—		—		10.2
Net current-period other comprehensive (loss) income	(24.0)		—		5.0		—		(19.0)
Balance, June 30, 2023	$	(618.3)	$	(0.3)	$	6.9	$	1.2	$	(610.5)

Balance, March 31, 2022	$	(236.3)	$	(0.3)	$	1.5	$	—	$	(235.1)
Other comprehensive (loss) income before reclassifications	(284.5)		—		2.0		—		(282.5)
Amounts reclassified from AOCI	(0.3)		—		—		—		(0.3)
Net current-period other comprehensive (loss) income	(284.8)		—		2.0		—		(282.8)
Balance, June 30, 2022	$	(521.1)	$	(0.3)	$	3.5	$	—	$	(517.9)

	Six Months Ended June 30,
	Unrealized holding gains (losses) on AFS securities		Unrealized holding losses on SERP		Unrealized holding gains (losses) on junior subordinated debt		Impairment loss on securities		Total
	(in millions)
Balance, December 31, 2022	$	(663.7)	$	(0.3)	$	3.0	$	—	$	(661.0)
Other comprehensive income before reclassifications	25.9		—		3.9		1.2		31.0
Amounts reclassified from AOCI	19.5		—		—		—		19.5
Net current-period other comprehensive income	45.4		—		3.9		1.2		50.5
Balance, June 30, 2023	$	(618.3)	$	(0.3)	$	6.9	$	1.2	$	(610.5)

Balance, December 31, 2021	$	16.7	$	(0.3)	$	(0.7)	$	—	$	15.7
Other comprehensive (loss) income before reclassifications	(532.4)		—		4.2		—		(528.2)
Amounts reclassified from AOCI	(5.4)		—		—		—		(5.4)
Net current-period other comprehensive (loss) income	(537.8)		—		4.2		—		(533.6)
Balance, June 30, 2022	$	(521.1)	$	(0.3)	$	3.5	$	—	$	(517.9)

Derivatives and Hedging (Tables)

3 Months Ended

6 Months Ended

Jun. 30, 2023

Derivative Instruments and Hedging Activities Disclosure [Abstract]

Schedule of Derivative Instruments in Statement of Financial Position

11. DERIVATIVES AND HEDGING ACTIVITIES

The Company is a party to various derivative instruments. The primary types of derivatives that the Company uses are interest rate contracts, forward purchase and sale commitments, and interest rate futures. Generally, these instruments are used to help manage the Company's exposure to interest rate risk related to IRLCs and its inventory of loans HFS and MSRs and also to meet client financing and hedging needs.

Derivatives are recorded at fair value on the Consolidated Balance Sheets, after taking into account the effects of bilateral collateral and master netting agreements. These agreements allow the Company to settle all derivative contracts held with the same counterparty on a net basis, and to offset net derivative positions with related cash collateral, where applicable.

Derivatives Designated in Hedge Relationships

The Company utilizes derivatives that have been designated as part of a hedge relationship in accordance with the applicable accounting guidance to minimize the exposure to changes in benchmark interest rates and volatility of net interest income and EVE to interest rate fluctuations. The primary derivative instruments used to manage interest rate risk are interest rate swaps, which convert the contractual interest rate index of agreed-upon amounts of assets and liabilities (i.e., notional amounts) from either a fixed rate to a variable rate, or from a variable rate to a fixed rate.

The Company has pay fixed/receive variable interest rate swaps designated as fair value hedges of certain fixed rate loans. As a result, the Company receives variable-rate interest payments in exchange for making fixed-rate payments over the lives of the contracts without exchanging the notional amounts. The variable-rate interest payments are based on LIBOR and converted to SOFR plus a spread adjustment upon the discontinuation of LIBOR in June 2023.

The Company also has pay fixed/receive variable interest rate swaps, designated as fair value hedges using the portfolio layer method to manage the exposure to changes in fair value associated with fixed rate loans, resulting from changes in the designated benchmark interest rate (federal funds rate). These portfolio layer hedges provide the Company the ability to execute a fair value hedge of the interest rate risk associated with a portfolio of similar prepayable assets. Under these interest rate swap contracts, the Company receives a variable rate based on SOFR and pays a fixed rate on the outstanding notional amount.

The Company also had pay fixed/receive variable interest rate swaps, designated as fair value hedges using the last-of-layer method. Upon termination of these last-of-layer hedges in 2022, the cumulative basis adjustment on these hedges was allocated across the remaining loan pool and is being amortized over the remaining term. At June 30, 2023, the remaining cumulative basis adjustment on the terminated last-of-layer hedges totaled $15 million.

Derivatives Not Designated in Hedge Relationships

Management enters into certain foreign exchange derivative contracts, back-to-back interest rate contracts, and risk participation agreements which are not designated as accounting hedges. Foreign exchange derivative contracts include spot, forward, forward window, and swap contracts. The purpose of these derivative contracts is to mitigate foreign currency risk on transactions entered into, or on behalf of customers. Contracts with customers, along with the related derivative trades that the Company places, are both remeasured at fair value, and are referred to as economic hedges since they economically offset the Company's exposure. The Company's back-to-back interest rate contracts are used to allow customers to manage long-term interest rate risk. Risk participation agreements are entered into with lead banks in certain loan syndications to share in the risk of default on interest rate swaps on the participated loan.

The Company also uses derivative financial instruments to manage exposure to interest rate risk within its mortgage banking business related to IRLCs and its inventory of loans HFS and MSRs. The Company economically hedges the changes in fair value associated with changes in interest rates generally by utilizing forward sale commitments, interest rate futures and interest rate swaps.

Fair Value Hedges

As of June 30, 2023 and December 31, 2022, the following amounts are reflected on the Consolidated Balance Sheets related to cumulative basis adjustments for outstanding fair value hedges:


	June 30, 2023				December 31, 2022
	Carrying Value of Hedged Assets/(Liabilities)		Cumulative Fair Value Hedging Adjustment (1)		Carrying Value of Hedged Assets/(Liabilities)		Cumulative Fair Value Hedging Adjustment (1)
	(in millions)
Loans HFI, net of deferred loan fees and costs (2)	$	3,934	$	52	$	447	$	17

(1)Included in the carrying value of the hedged assets/(liabilities).

(2)As of June 30, 2023, included portfolio layer method derivative instruments with $3.5 billion designated as the hedged amount (from a closed portfolio of prepayable fixed rate loans with a carrying value of $6.8 billion). The cumulative basis adjustment included in the carrying value of these hedged items totaled $29 million.

For the Company's derivative instruments that are designated and qualify as fair value hedges, the gain or loss on the derivative instrument as well as the offsetting loss or gain on the hedged item attributable to the hedged risk are recognized in current period earnings. The loss or gain on the hedged item is recognized in the same line item as the offsetting loss or gain on the related interest rate swaps. For loans, the gain or loss on the hedged item is included in interest income, as shown in the table below.


	Three Months Ended June 30,
	2023				2022
Income Statement Classification	Gain/(Loss) on Swaps		Gain/(Loss) on Hedged Item		Gain/(Loss) on Swaps		Gain/(Loss) on Hedged Item
	(in millions)
Interest income	$	39.0	$	(39.0)	$	15.2	$	(15.2)


	Six Months Ended June 30,
	2023				2022
Income Statement Classification	Gain/(Loss) on Swaps		Gain/(Loss) on Hedged Item		Gain/(Loss) on Swaps		Gain/(Loss) on Hedged Item
	(in millions)
Interest income	$	34.7	$	(34.7)	$	48.7	$	(48.7)

In addition to the gains and losses on the Company's outstanding fair value hedges presented in the above table, the Company recognized $2.9 million and $5.9 million in interest income related to the amortization of the cumulative basis adjustment on its discontinued last-of-layer hedges during the three and six months ended June 30, 2023, respectively.

Fair Values, Volume of Activity, and Gain/Loss Information Related to Derivative Instruments

The following table summarizes the fair value of the Company's derivative instruments on a gross basis as of June 30, 2023, December 31, 2022, and June 30, 2022. The change in the notional amounts of these derivatives from June 30, 2022 to June 30, 2023 indicates the volume of the Company's derivative transaction activity during these periods. The derivative asset and liability balances are presented on a gross basis, prior to the application of bilateral collateral and master netting agreements. Total derivative assets and liabilities are adjusted to take into account the impact of legally enforceable master netting agreements that allow the Company to settle all derivative contracts with the same counterparty on a net basis and to offset the net derivative position with the related cash collateral. Where master netting agreements are not in effect or are not enforceable under bankruptcy laws, the Company does not adjust those derivative amounts with counterparties.


	June 30, 2023						December 31, 2022						June 30, 2022
			Fair Value						Fair Value						Fair Value
	Notional Amount		Derivative Assets		Derivative Liabilities		Notional Amount		Derivative Assets		Derivative Liabilities		Notional Amount		Derivative Assets		Derivative Liabilities
	(in millions)
Derivatives designated as hedging instruments:
Fair value hedges
Interest rate contracts	$	4,033	$	56	$	4	$	476	$	18	$	—	$	500	$	5	$	11
Total	$	4,033	$	56	$	4	$	476	$	18	$	—	$	500	$	5	$	11

Derivatives not designated as hedging instruments (1):
Foreign currency contracts	$	71	$	1	$	1	$	250	$	1	$	9	$	138	$	1	$	—
Forward purchase contracts	4,484		1		16		2,709		1		13		4,764		32		10
Forward sales contracts	7,279		26		2		4,985		16		8		9,621		35		35
Futures purchase contracts (2), (3)	200		—		—		—		—		—		700		—		—
Futures sales contracts (2), (3)	12,210		—		—		8,706		—		—		6,072		—		—
Interest rate lock commitments	2,331		6		4		1,459		5		3		2,819		15		3
Interest rate contracts	2,424		14		14		1,538		6		6		64		—		—

Risk participation agreements	44		—		—		48		—		—		—		—		—
Total	$	29,043	$	48	$	37	$	19,695	$	29	$	39	$	24,178	$	83	$	48
Margin			85		12				4		1				(9)		24
Total, including margin	$	29,043	$	133	$	49	$	19,695	$	33	$	40	$	24,178	$	74	$	72

(1)Relate to economic hedging arrangements.

(2)The Company enters into forward purchase and sales contracts that are subject to daily remargining and almost all of which are based on three-month SOFR to hedge against its MSR valuation exposure. The notional amount on these contracts is substantial as these contracts have a duration of only 0.25 years and are intended to cover the longer duration of MSR hedges.

(3)The notional amounts previously reported for December 31, 2022 and June 30, 2022 have been adjusted in the current period to account for the impact of offsetting contracts. To close a futures contract prior to settlement, the Company purchases an offsetting future with the same terms as the original contract and these contracts no longer require settlement.

The fair value of derivative contracts, after taking into account the effects of master netting agreements, is included in other assets or other liabilities on the Consolidated Balance Sheets, as summarized in the table below:


	June 30, 2023						December 31, 2022						June 30, 2022
	Gross amount of recognized assets (liabilities)		Gross offset		Net assets (liabilities)		Gross amount of recognized assets (liabilities)		Gross offset		Net assets (liabilities)		Gross amount of recognized assets (liabilities)		Gross offset		Net assets (liabilities)
	(in millions)
Derivatives subject to master netting arrangements:
Assets
Forward purchase contracts	$	1	$	—	$	1	$	1	$	—	$	1	$	31	$	—	$	31
Forward sales contracts	26		—		26		13		—		13		33		—		33
Interest rate contracts	70		—		70		18		—		18		5		—		5
Margin	85		—		85		4		—		4		(9)		—		(9)
Netting	—		(28)		(28)		—		(17)		(17)		—		(55)		(55)
	$	182	$	(28)	$	154	$	36	$	(17)	$	19	$	60	$	(55)	$	5
Liabilities
Forward purchase contracts	$	(16)	$	—	$	(16)	$	(12)	$	—	$	(12)	$	(10)	$	—	$	(10)
Forward sales contracts	(2)		—		(2)		(8)		—		(8)		(34)		—		(34)
Interest rate contracts	(4)		—		(4)		—		—		—		(11)		—		(11)
Margin	(12)		—		(12)		(1)		—		(1)		(24)		—		(24)
Netting	—		28		28		—		17		17		—		55		55
	$	(34)	$	28	$	(6)	$	(21)	$	17	$	(4)	$	(79)	$	55	$	(24)
Derivatives not subject to master netting arrangements:
Assets
Foreign currency contracts	$	1	$	—	$	1	$	1	$	—	$	1	$	1	$	—	$	1
Forward purchase contracts	—		—		—		—		—		—		1		—		1
Forward sales contracts	—		—		—		3		—		3		2		—		2
Interest rate lock commitments	6		—		6		5		—		5		15		—		15
Interest rate contracts	—		—		—		6		—		6		—		—		—

	$	7	$	—	$	7	$	15	$	—	$	15	$	19	$	—	$	19
Liabilities
Foreign currency contracts	$	(1)	$	—	$	(1)	$	(9)	$	—	$	(9)	$	—	$	—	$	—
Forward purchase contracts	—		—		—		(1)		—		(1)		—		—		—
Forward sales contracts	—		—		—		—		—		—		(1)		—		(1)
Interest rate lock commitments	(4)		—		(4)		(3)		—		(3)		(3)		—		(3)
Interest rate contracts	(14)		—		(14)		(6)		—		(6)		—		—		—
	$	(19)	$	—	$	(19)	$	(19)	$	—	$	(19)	$	(4)	$	—	$	(4)
Total derivatives and margin
Assets	$	189	$	(28)	$	161	$	51	$	(17)	$	34	$	79	$	(55)	$	24
Liabilities	$	(53)	$	28	$	(25)	$	(40)	$	17	$	(23)	$	(83)	$	55	$	(28)

The following table summarizes the net gain (loss) on derivatives included in income:


	Three Months Ended June 30,				Six Months Ended June 30,
	2023		2022		2023		2022
	(in millions)
Net gain (loss) on loan origination and sale activities:
Interest rate lock commitments	$	(11.1)	$	23.2	$	0.3	$	2.4
Forward contracts	55.6		101.0		18.8		342.3

Interest rate swaps	(4.6)		—		(3.3)		—
Other contracts	2.2		(6.1)		1.8		(9.8)
Total gain	$	42.1	$	118.1	$	17.6	$	334.9
Net loan servicing revenue:
Forward contracts	$	(13.2)	$	(8.0)	$	(14.7)	$	(42.9)

Futures contracts	18.7		(21.9)		14.7		(43.9)
Interest rate swaps	(36.5)		—		(17.6)		—
Total loss	$	(31.0)	$	(29.9)	$	(17.6)	$	(86.8)

Counterparty Credit Risk

Like other financial instruments, derivatives contain an element of credit risk. This risk is measured as the expected replacement value of the contracts. Management enters into bilateral collateral and master netting agreements that provide for the net settlement of all contracts with the same counterparty. Additionally, management monitors counterparty credit risk exposure on each contract to determine appropriate limits on the Company's total credit exposure across all product types, which may require the Company to post collateral to counterparties when these contracts are in a net liability position and conversely, for counterparties to post collateral to the Company when these contracts are in a net asset position. Management reviews the Company's collateral positions on a daily basis and exchanges collateral with counterparties in accordance with standard ISDA documentation and other related agreements. The Company generally posts or holds collateral in the form of cash deposits or highly rated securities issued by the U.S. Treasury or government-sponsored enterprises (FNMA, and FHLMC), or guaranteed by GNMA. At June 30, 2023, December 31, 2022, and June 30, 2022 collateral pledged by the Company to counterparties for its derivatives totaled $90 million, $11 million, and $30 million, respectively.

Schedule of Derivative Assets at Fair Value

As of June 30, 2023 and December 31, 2022, the following amounts are reflected on the Consolidated Balance Sheets related to cumulative basis adjustments for outstanding fair value hedges:


	June 30, 2023				December 31, 2022
	Carrying Value of Hedged Assets/(Liabilities)		Cumulative Fair Value Hedging Adjustment (1)		Carrying Value of Hedged Assets/(Liabilities)		Cumulative Fair Value Hedging Adjustment (1)
	(in millions)
Loans HFI, net of deferred loan fees and costs (2)	$	3,934	$	52	$	447	$	17

(1)Included in the carrying value of the hedged assets/(liabilities).

(2)As of June 30, 2023, included portfolio layer method derivative instruments with $3.5 billion designated as the hedged amount (from a closed portfolio of prepayable fixed rate loans with a carrying value of $6.8 billion). The cumulative basis adjustment included in the carrying value of these hedged items totaled $29 million.

Derivative Instruments, Gain (Loss)

For the Company's derivative instruments that are designated and qualify as fair value hedges, the gain or loss on the derivative instrument as well as the offsetting loss or gain on the hedged item attributable to the hedged risk are recognized in current period earnings. The loss or gain on the hedged item is recognized in the same line item as the offsetting loss or gain on the related interest rate swaps. For loans, the gain or loss on the hedged item is included in interest income, as shown in the table below.


	Three Months Ended June 30,
	2023				2022
Income Statement Classification	Gain/(Loss) on Swaps		Gain/(Loss) on Hedged Item		Gain/(Loss) on Swaps		Gain/(Loss) on Hedged Item
	(in millions)
Interest income	$	39.0	$	(39.0)	$	15.2	$	(15.2)


	Six Months Ended June 30,
	2023				2022
Income Statement Classification	Gain/(Loss) on Swaps		Gain/(Loss) on Hedged Item		Gain/(Loss) on Swaps		Gain/(Loss) on Hedged Item
	(in millions)
Interest income	$	34.7	$	(34.7)	$	48.7	$	(48.7)

In addition to the gains and losses on the Company's outstanding fair value hedges presented in the above table, the Company recognized $2.9 million and $5.9 million in interest income related to the amortization of the cumulative basis adjustment on its discontinued last-of-layer hedges during the three and six months ended June 30, 2023, respectively.

Earnings per Share (Tables)

6 Months Ended

Jun. 30, 2023

Earnings Per Share [Abstract]

Schedule of Earnings Per Share, Basic and Diluted

The following table presents the calculation of basic and diluted EPS and summarizes the weighted average common shares excluded from the diluted EPS calculation due to their antidilutive effect:


	Three Months Ended June 30,				Six Months Ended June 30,
	2023		2022		2023		2022
	(in millions, except per share amounts)
Weighted average shares - basic	108.3		107.3		108.2		106.7
Dilutive effect of stock awards	—		0.4		0.1		0.4
Weighted average shares - diluted	108.3		107.7		108.3		107.1
Net income available to common stockholders	$	212.5	$	257.0	$	351.5	$	493.9

Earnings per Common Share:
Basic	$	1.96	$	2.40	$	3.25	$	4.63
Diluted	1.96		2.39		3.24		4.61

Antidilutive restricted stock outstanding	0.4		—		0.2		—

Commitments and Contingencies (Tables)

6 Months Ended

Jun. 30, 2023

Commitments and Contingencies Disclosure [Abstract]

Summary of Contractual Amounts for Unfunded Commitments and Letters of Credit

A summary of the contractual amounts for unfunded commitments and letters of credit are as follows:


	June 30, 2023		December 31, 2022
	(in millions)
Commitments to extend credit, including unsecured loan commitments of $1,168 at June 30, 2023 and $1,209 at December 31, 2022	$	15,319	$	18,674
Credit card commitments and financial guarantees	405		379
Letters of credit, including unsecured letters of credit of $6 at June 30, 2023 and $7 at December 31, 2022	240		265
Total	$	15,964	$	19,318

Fair Value Accounting (Tables)

6 Months Ended

Jun. 30, 2023

Fair Value Disclosures [Abstract]

Gains and Losses from Fair Value Changes Included in Consolidated Statement of Operations

The following table presents unrealized gains and losses from fair value changes on junior subordinated debt:

Fair Value of Assets and Liabilities

The fair value of assets and liabilities measured at fair value on a recurring basis was determined using the following inputs:


	Fair Value Measurements at the End of the Reporting Period Using:
	Quoted Prices in Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)		Fair Value
June 30, 2023	(in millions)

Assets:




Available-for-sale debt securities
CLO	$	—	$	2,144	$	—	$	2,144
Commercial MBS issued by GSEs	—		60		—		60
Corporate debt securities	—		338		—		338
Private label residential MBS	—		1,141		—		1,141
Residential MBS issued by GSEs	—		1,765		—		1,765
Tax-exempt	—		830		—		830

U.S. Treasury securities	2,286		—		—		2,286
Other	27		40		—		67
Total AFS debt securities	$	2,313	$	6,318	$	—	$	8,631
Equity securities
Common stock	$	2	$	—	$	—	$	2
CRA investments	25		12		—		37
Preferred stock	95		5		—		100
Total equity securities	$	122	$	17	$	—	$	139
Loans HFS (2)	$	—	$	1,337	$	3	$	1,340
MSRs	—		—		1,007		1,007
Derivative assets (1)	—		98		6		104
Liabilities:
Junior subordinated debt (3)	$	—	$	—	$	57	$	57
Derivative liabilities (1)	—		37		4		41

(1)See "Note 11. Derivatives and Hedging Activities." In addition, the carrying value of loans is decreased by $52 million as of June 30, 2023 for the effective portion of the hedge, which relates to the fair value of the hedges put in place to mitigate against fluctuations in interest rates. Derivative assets and liabilities exclude margin of $85 million and $12 million, respectively.

(2)Includes only the portion of loans HFS that is recorded at fair value at each reporting period pursuant to the election of FVO treatment.

(3)Includes only the portion of junior subordinated debt that is recorded at fair value at each reporting period pursuant to the election of FVO treatment.


	Fair Value Measurements at the End of the Reporting Period Using:
	Quoted Prices in Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)		Fair Value
December 31, 2022	(in millions)

Assets:




Available-for-sale debt securities
CLO	$	—	$	2,706	$	—	$	2,706
Commercial MBS issued by GSEs	—		97		—		97
Corporate debt securities	—		390		—		390
Private label residential MBS	—		1,199		—		1,199
Residential MBS issued by GSEs	—		1,740		—		1,740
Tax-exempt	—		891		—		891


Other	24		45		—		69
Total AFS debt securities	$	24	$	7,068	$	—	$	7,092
Equity securities
Common stock	$	3	$	—	$	—	$	3
CRA investments	24		25		—		49
Preferred stock	108		—		—		108
Total equity securities	$	135	$	25	$	—	$	160
Loans - HFS (2)	$	—	$	1,172	$	1	$	1,173
Mortgage servicing rights	—		—		1,148		1,148
Derivative assets (1)	—		42		5		47
Liabilities:
Junior subordinated debt (3)	$	—	$	—	$	63	$	63
Derivative liabilities (1)	—		36		3		39

(1)See "Note 11. Derivatives and Hedging Activities." In addition, the carrying value of loans is decreased by $17 million as of December 31, 2022 for the effective portion of the hedge, which relates to the fair value of the hedges put in place to mitigate against fluctuations in interest rates. Derivative assets and liabilities exclude margin of $4 million and $1 million, respectively.

(2)Includes only the portion of loans HFS that is recorded at fair value at each reporting period pursuant to the election of FVO treatment.

(3)Includes only the portion of junior subordinated debt that is recorded at fair value at each reporting period pursuant to the election of FVO treatment.

Change in Level 3 Liabilities Measured at Fair Value on Recurring Basis

he change in Level 3 liabilities measured at fair value on a recurring basis included in OCI was as follows:


	Junior Subordinated Debt
	Three Months Ended June 30,				Six Months Ended June 30,
	2023		2022		2023		2022
	(in millions)
Beginning balance	$	(64.0)	$	(64.5)	$	(62.5)	$	(67.4)
Change in fair value (1)	6.7		2.7		5.2		5.6
Ending balance	$	(57.3)	$	(61.8)	$	(57.3)	$	(61.8)

Assets Measured at Fair Value on Nonrecurring Basis

The following table presents such assets carried on the Consolidated Balance Sheet by caption and by level within the ASC 825 hierarchy:


	Fair Value Measurements at the End of the Reporting Period Using
	Total		Quoted Prices in Active Markets for Identical Assets (Level 1)		Active Markets for Similar Assets (Level 2)		Unobservable Inputs (Level 3)
	(in millions)
As of June 30, 2023:
Loans HFI	$	368	$	—	$	—	$	368
Other assets acquired through foreclosure	11		—		—		11
As of December 31, 2022:
Loans HFI	$	295	$	—	$	—	$	295
Other assets acquired through foreclosure	11		—		—		11

Estimated Fair Value of Financial Instruments

The estimated fair value of the Company’s financial instruments is as follows:


	June 30, 2023
	Carrying Amount		Fair Value
			Level 1		Level 2		Level 3		Total
	(in millions)
Financial assets:

Investment securities:
HTM	$	1,367	$	—	$	1,186	$	—	$	1,186
AFS	8,631		2,313		6,318		—		8,631
Equity	139		122		17		—		139
Derivative assets (2)	104		—		98		6		104
Loans HFS (1)	3,156		—		3,136		20		3,156
Loans HFI, net	47,554		—		—		44,772		44,772
Mortgage servicing rights	1,007		—		—		1,007		1,007
Accrued interest receivable	348		—		348		—		348
Financial liabilities:
Deposits	$	51,041	$	—	$	51,040	$	—	$	51,040
Other borrowings	9,567		—		9,490		—		9,490
Qualifying debt	888		—		620		69		689
Derivative liabilities (2)	41		—		37		4		41
Accrued interest payable	104		—		104		—		104

(1) Includes loans transferred from HFI to HFS. As these transferred loans are salable into active markets, the fair value is based on quoted market or contracted selling prices or a market price equivalent, which are categorized as Level 2 in the fair value hierarchy.

(2) Derivative assets and liabilities exclude margin of $85 million and $12 million, respectively.


	December 31, 2022
	Carrying Amount		Fair Value
			Level 1		Level 2		Level 3		Total
	(in millions)
Financial assets:
Investment securities:
HTM	$	1,289	$	—	$	1,112	$	—	$	1,112
AFS	7,092		24		7,068		—		7,092
Equity securities	160		135		25		—		160
Derivative assets (1)	51		—		42		5		47
Loans HFS	1,184		—		1,172		1		1,173
Loans HFI, net	51,552		—		—		47,679		47,679
Mortgage servicing rights	1,148		—		—		1,148		1,148
Accrued interest receivable	357		—		357		—		357
Financial liabilities:
Deposits	$	53,644	$	—	$	53,698	$	—	$	53,698
Other borrowings	6,299		—		6,261		—		6,261
Qualifying debt	893		—		735		75		810
Derivative liabilities (1)	40		—		36		3		39
Accrued interest payable	35		—		35		—		35

(1) Derivative assets and liabilities exclude margin of $4 million and $1 million, respectively.

Segments (Tables)

6 Months Ended

Jun. 30, 2023

Segment Reporting [Abstract]

Operating Segment Information

The following is a summary of operating segment information for the periods indicated:


Balance Sheet:	Consolidated Company		Commercial		Consumer Related		Corporate & Other
At June 30, 2023:	(in millions)
Assets:
Cash, cash equivalents, and investment securities	$	12,527	$	13	$	150	$	12,364
Loans HFS	3,156		1,049		2,107		—
Loans HFI, net of deferred fees and costs	47,875		28,139		19,736		—
Less: allowance for credit losses	(321)		(269)		(52)		—
Net loans HFI	47,554		27,870		19,684		—
Other assets acquired through foreclosure, net	11		11		—		—
Goodwill and other intangible assets, net	674		293		381		—
Other assets	4,238		567		1,693		1,978
Total assets	$	68,160	$	29,803	$	24,015	$	14,342
Liabilities:
Deposits	$	51,041	$	21,460	$	22,380	$	7,201
Borrowings and qualifying debt	10,455		6		1,489		8,960
Other liabilities	979		70		173		736
Total liabilities	62,475		21,536		24,042		16,897
Allocated equity:	5,685		2,494		1,715		1,476
Total liabilities and stockholders' equity	$	68,160	$	24,030	$	25,757	$	18,373
Excess funds provided (used)	—		(5,773)		1,742		4,031




Income Statement:
Three Months Ended June 30, 2023:	(in millions)
Net interest income	$	550.3	$	356.5	$	204.8	$	(11.0)
Provision for credit losses	21.8		18.2		1.9		1.7
Net interest income (expense) after provision for credit losses	528.5		338.3		202.9		(12.7)
Non-interest income	119.0		30.8		86.1		2.1
Non-interest expense	387.4		147.7		232.3		7.4
Income (loss) before income taxes	260.1		221.4		56.7		(18.0)
Income tax expense (benefit)	44.4		43.4		11.2		(10.2)
Net income (loss)	$	215.7	$	178.0	$	45.5	$	(7.8)

Six Months Ended June 30, 2023:	(in millions)
Net interest income	$	1,160.2	$	746.0	$	404.0	$	10.2
Provision for credit losses	41.2		15.6		3.4		22.2
Net interest income (expense) after provision for credit losses	1,119.0		730.4		400.6		(12.0)
Non-interest income	61.0		(65.9)		137.1		(10.2)
Non-interest expense	735.3		283.6		424.4		27.3
Income (loss) before provision for income taxes	444.7		380.9		113.3		(49.5)
Income tax expense	86.8		81.9		24.0		(19.1)
Net income (loss)	$	357.9	$	299.0	$	89.3	$	(30.4)


Balance Sheet:	Consolidated Company		Commercial		Consumer Related		Corporate
At December 31, 2022:	(in millions)
Assets:
Cash, cash equivalents, and investment securities	$	9,803	$	12	$	—	$	9,791
Loans held for sale	1,184		—		1,184		—
Loans, net of deferred fees and costs	51,862		31,414		20,448		—
Less: allowance for credit losses	(310)		(262)		(48)		—
Total loans	51,552		31,152		20,400		—
Other assets acquired through foreclosure, net	11		11		—		—
Goodwill and other intangible assets, net	680		293		387		—
Other assets	4,504		435		2,180		1,889
Total assets	$	67,734	$	31,903	$	24,151	$	11,680
Liabilities:
Deposits	$	53,644	$	29,494	$	18,492	$	5,658
Borrowings and qualifying debt	7,192		27		340		6,825
Other liabilities	1,542		83		656		803
Total liabilities	62,378		29,604		19,488		13,286
Allocated equity:	5,356		2,684		1,691		981
Total liabilities and stockholders' equity	$	67,734	$	32,288	$	21,179	$	14,267
Excess funds provided (used)	—		385		(2,972)		2,587




Income Statements:
Three Months Ended June 30, 2022:	(in millions)
Net interest income	$	525.0	$	370.5	$	219.4	$	(64.9)
Provision for (recovery of) credit losses	27.5		32.7		(5.2)		—
Net interest income (expense) after provision for credit losses	497.5		337.8		224.6		(64.9)
Non-interest income	95.0		18.0		74.6		2.4
Non-interest expense	268.9		115.9		139.1		13.9
Income (loss) before income taxes	323.6		239.9		160.1		(76.4)
Income tax expense (benefit)	63.4		57.3		38.1		(32.0)
Net income (loss)	$	260.2	$	182.6	$	122.0	$	(44.4)

Six Months Ended June 30, 2022:	(in millions)
Net interest income	$	974.5	$	705.3	$	402.7	$	(133.5)
Provision for (recovery of) credit losses	36.5		33.2		5.3		(2.0)
Net interest income (expense) after provision for credit losses	938.0		672.1		397.4		(131.5)
Non-interest income	201.3		34.9		153.8		12.6
Non-interest expense	517.5		230.4		264.1		23.0
Income (loss) before income taxes	621.8		476.6		287.1		(141.9)
Income tax expense (benefit)	121.5		113.4		68.5		(60.4)
Net income (loss)	$	500.3	$	363.2	$	218.6	$	(81.5)

Summary of Significant Accounting Policies - Additional Information (Detail)	6 Months Ended
	Jun. 30, 2023 Subsidiary
Significant Of Accounting Policies [Line Items]
Number Of Unconsolidated Subsidiaries	8

Investment Securities - Carrying Amounts and Fair Values of Investment Securities (Detail) - USD ($)
$ in Millions

Jun. 30, 2023

Dec. 31, 2022

Debt Securities, Available-for-sale [Line Items]

$ 139.0

^[1]

$ 160.0

^[2]

Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain

1,367.0

1,289.0

1.0

0.0

Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss

(182.0)

(177.0)

Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax

1,186.0

1,112.0

826.0

890.0

Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax

3.0

9.0

Securities available for sale Total, Amortized Cost

8,631.0

^[1]

7,092.0

^[2]

9,454.0

7,973.0

Commercial Mortgage Backed Securities Issued By US Government Sponsored Enterprise [Member]

Debt Securities, Available-for-sale [Line Items]

Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax

9.0

8.0

Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax

0.0

1.0

Securities available for sale Total, Amortized Cost

60.0

97.0

69.0

104.0

Corporate Bond Securities [Member]

Debt Securities, Available-for-sale [Line Items]

Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax

73.0

39.0

Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax

0.0

Securities available for sale Total, Amortized Cost

338.0

390.0

411.0

429.0

Residential Mortgage Backed Securities [Member]

Debt Securities, Available-for-sale [Line Items]

Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain

192.0

198.0

0.0

Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss

(40.0)

(39.0)

Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax

152.0

159.0

230.0

243.0

Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax

0.0

Securities available for sale Total, Amortized Cost

1,141.0

1,199.0

1,371.0

1,442.0

Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member]

Debt Securities, Available-for-sale [Line Items]

Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax

376.0

383.0

Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax

0.0

Securities available for sale Total, Amortized Cost

1,765.0

1,740.0

2,141.0

2,123.0

Nontaxable Municipal Bonds [Member]

Debt Securities, Available-for-sale [Line Items]

Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain

1,175.0

1,091.0

1.0

0.0

Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss

(142.0)

(138.0)

Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax

1,034.0

953.0

89.0

115.0

Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax

0.0

2.0

Securities available for sale Total, Amortized Cost

830.0

891.0

919.0

1,004.0

US Treasury Securities [Member]

Debt Securities, Available-for-sale [Line Items]

Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax

0.0

Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax

0.0

Securities available for sale Total, Amortized Cost

2,286.0

2,286.0

CRA investments [Member]

Debt Securities, Available-for-sale [Line Items]

37.0

49.0

Debt Securities, Available-for-sale [Line Items]

Collateralized Loan Obligations

100.0

108.0

Debt Securities, Available-for-sale [Line Items]

Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax

39.0

90.0

Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax

0.0

Securities available for sale Total, Amortized Cost

2,144.0

2,706.0

2,183.0

2,796.0

Other Security Investments

Debt Securities, Available-for-sale [Line Items]

Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax

10.0

12.0

Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax

3.0

6.0

Securities available for sale Total, Amortized Cost

67.0

69.0

74.0

75.0

AAA [Member]

Debt Securities, Available-for-sale [Line Items]

0.0

^[1]

0.0

^[2]

0.0

AAA [Member] | Commercial Mortgage Backed Securities Issued By US Government Sponsored Enterprise [Member]

1,244.0

^[1]

1,479.0

^[2]

Debt Securities, Available-for-sale [Line Items]

AAA [Member] | Corporate Bond Securities [Member]

0.0

Debt Securities, Available-for-sale [Line Items]

AAA [Member] | Residential Mortgage Backed Securities [Member]

0.0

Debt Securities, Available-for-sale [Line Items]

0.0

AAA [Member] | Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member]

1,115.0

1,158.0

Debt Securities, Available-for-sale [Line Items]

AAA [Member] | Nontaxable Municipal Bonds [Member]

0.0

Debt Securities, Available-for-sale [Line Items]

0.0

AAA [Member] | US Treasury Securities [Member]

9.0

11.0

Debt Securities, Available-for-sale [Line Items]

AAA [Member] | CRA investments [Member]

0.0

Debt Securities, Available-for-sale [Line Items]

AAA [Member] | Preferred Stock [Member]

0.0

Debt Securities, Available-for-sale [Line Items]

AAA [Member] | Collateralized Loan Obligations

0.0

Debt Securities, Available-for-sale [Line Items]

AAA [Member] | Other Security Investments

120.0

310.0

Debt Securities, Available-for-sale [Line Items]

Split-rated AAA/AA Plus [Member]

0.0

Debt Securities, Available-for-sale [Line Items]

25.0

^[1]

24.0

^[2]

0.0

Split-rated AAA/AA Plus [Member] | Commercial Mortgage Backed Securities Issued By US Government Sponsored Enterprise [Member]

4,127.0

^[1]

1,852.0

^[2]

Debt Securities, Available-for-sale [Line Items]

Split-rated AAA/AA Plus [Member] | Corporate Bond Securities [Member]

60.0

97.0

Debt Securities, Available-for-sale [Line Items]

Split-rated AAA/AA Plus [Member] | Residential Mortgage Backed Securities [Member]

0.0

Debt Securities, Available-for-sale [Line Items]

0.0

Split-rated AAA/AA Plus [Member] | Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member]

0.0

Debt Securities, Available-for-sale [Line Items]

Split-rated AAA/AA Plus [Member] | Nontaxable Municipal Bonds [Member]

1,765.0

1,740.0

Debt Securities, Available-for-sale [Line Items]

0.0

Split-rated AAA/AA Plus [Member] | US Treasury Securities [Member]

16.0

15.0

Debt Securities, Available-for-sale [Line Items]

Split-rated AAA/AA Plus [Member] | CRA investments [Member]

2,286.0

Debt Securities, Available-for-sale [Line Items]

Split-rated AAA/AA Plus [Member] | Preferred Stock [Member]

25.0

24.0

Debt Securities, Available-for-sale [Line Items]

Split-rated AAA/AA Plus [Member] | Collateralized Loan Obligations

0.0

Debt Securities, Available-for-sale [Line Items]

Split-rated AAA/AA Plus [Member] | Other Security Investments

0.0

Debt Securities, Available-for-sale [Line Items]

Debt Securities, Available-for-sale [Line Items]

0.0

AA Plus to AA- [Member]

0.0

^[1]

0.0

^[2]

0.0

AA Plus to AA- [Member] | Commercial Mortgage Backed Securities Issued By US Government Sponsored Enterprise [Member]

2,348.0

^[1]

2,563.0

^[2]

Debt Securities, Available-for-sale [Line Items]

AA Plus to AA- [Member] | Corporate Bond Securities [Member]

0.0

Debt Securities, Available-for-sale [Line Items]

AA Plus to AA- [Member] | Residential Mortgage Backed Securities [Member]

0.0

Debt Securities, Available-for-sale [Line Items]

0.0

AA Plus to AA- [Member] | Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member]

25.0

41.0

Debt Securities, Available-for-sale [Line Items]

AA Plus to AA- [Member] | Nontaxable Municipal Bonds [Member]

0.0

Debt Securities, Available-for-sale [Line Items]

0.0

AA Plus to AA- [Member] | US Treasury Securities [Member]

354.0

392.0

Debt Securities, Available-for-sale [Line Items]

AA Plus to AA- [Member] | CRA investments [Member]

0.0

Debt Securities, Available-for-sale [Line Items]

AA Plus to AA- [Member] | Preferred Stock [Member]

0.0

Debt Securities, Available-for-sale [Line Items]

AA Plus to AA- [Member] | Collateralized Loan Obligations

0.0

Debt Securities, Available-for-sale [Line Items]

AA Plus to AA- [Member] | Other Security Investments

1,960.0

2,121.0

Debt Securities, Available-for-sale [Line Items]

Debt Securities, Available-for-sale [Line Items]

9.0

A Plus to A- [Member]

0.0

^[1]

0.0

^[2]

0.0

A Plus to A- [Member] | Commercial Mortgage Backed Securities Issued By US Government Sponsored Enterprise [Member]

519.0

^[1]

783.0

^[2]

Debt Securities, Available-for-sale [Line Items]

A Plus to A- [Member] | Corporate Bond Securities [Member]

0.0

Debt Securities, Available-for-sale [Line Items]

A Plus to A- [Member] | Residential Mortgage Backed Securities [Member]

70.0

74.0

Debt Securities, Available-for-sale [Line Items]

0.0

A Plus to A- [Member] | Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member]

0.0

Debt Securities, Available-for-sale [Line Items]

A Plus to A- [Member] | Nontaxable Municipal Bonds [Member]

0.0

Debt Securities, Available-for-sale [Line Items]

0.0

A Plus to A- [Member] | US Treasury Securities [Member]

376.0

425.0

Debt Securities, Available-for-sale [Line Items]

A Plus to A- [Member] | CRA investments [Member]

0.0

Debt Securities, Available-for-sale [Line Items]

A Plus to A- [Member] | Preferred Stock [Member]

0.0

Debt Securities, Available-for-sale [Line Items]

A Plus to A- [Member] | Collateralized Loan Obligations

0.0

Debt Securities, Available-for-sale [Line Items]

A Plus to A- [Member] | Other Security Investments

64.0

275.0

Debt Securities, Available-for-sale [Line Items]

BBB Plus to BBB- [Member]

9.0

Debt Securities, Available-for-sale [Line Items]

53.0

^[1]

82.0

^[2]

0.0

BBB Plus to BBB- [Member] | Commercial Mortgage Backed Securities Issued By US Government Sponsored Enterprise [Member]

248.0

^[1]

343.0

^[2]

Debt Securities, Available-for-sale [Line Items]

BBB Plus to BBB- [Member] | Corporate Bond Securities [Member]

0.0

Debt Securities, Available-for-sale [Line Items]

BBB Plus to BBB- [Member] | Residential Mortgage Backed Securities [Member]

219.0

316.0

Debt Securities, Available-for-sale [Line Items]

0.0

BBB Plus to BBB- [Member] | Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member]

0.0

Debt Securities, Available-for-sale [Line Items]

BBB Plus to BBB- [Member] | Nontaxable Municipal Bonds [Member]

0.0

Debt Securities, Available-for-sale [Line Items]

0.0

BBB Plus to BBB- [Member] | US Treasury Securities [Member]

0.0

Debt Securities, Available-for-sale [Line Items]

BBB Plus to BBB- [Member] | CRA investments [Member]

0.0

Debt Securities, Available-for-sale [Line Items]

BBB Plus to BBB- [Member] | Preferred Stock [Member]

0.0

Debt Securities, Available-for-sale [Line Items]

BBB Plus to BBB- [Member] | Collateralized Loan Obligations

53.0

82.0

Debt Securities, Available-for-sale [Line Items]

BBB Plus to BBB- [Member] | Other Security Investments

0.0

Debt Securities, Available-for-sale [Line Items]

BB Plus and below [Member]

29.0

27.0

Debt Securities, Available-for-sale [Line Items]

37.0

^[1]

17.0

^[2]

0.0

BB Plus and below [Member] | Commercial Mortgage Backed Securities Issued By US Government Sponsored Enterprise [Member]

53.0

^[1]

6.0

^[2]

Debt Securities, Available-for-sale [Line Items]

BB Plus and below [Member] | Corporate Bond Securities [Member]

0.0

Debt Securities, Available-for-sale [Line Items]

BB Plus and below [Member] | Residential Mortgage Backed Securities [Member]

49.0

0.0

Debt Securities, Available-for-sale [Line Items]

0.0

BB Plus and below [Member] | Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member]

1.0

0.0

Debt Securities, Available-for-sale [Line Items]

BB Plus and below [Member] | Nontaxable Municipal Bonds [Member]

0.0

Debt Securities, Available-for-sale [Line Items]

0.0

BB Plus and below [Member] | US Treasury Securities [Member]

0.0

Debt Securities, Available-for-sale [Line Items]

BB Plus and below [Member] | CRA investments [Member]

0.0

Debt Securities, Available-for-sale [Line Items]

BB Plus and below [Member] | Preferred Stock [Member]

0.0

Debt Securities, Available-for-sale [Line Items]

BB Plus and below [Member] | Collateralized Loan Obligations

37.0

17.0

Debt Securities, Available-for-sale [Line Items]

BB Plus and below [Member] | Other Security Investments

0.0

Debt Securities, Available-for-sale [Line Items]

Corporate Credit Quality Indicator Unrated [Member]

3.0

6.0

Debt Securities, Available-for-sale [Line Items]

24.0

^[1]

37.0

^[2]

1,367.0

1,289.0

Corporate Credit Quality Indicator Unrated [Member] | Commercial Mortgage Backed Securities Issued By US Government Sponsored Enterprise [Member]

92.0

^[1]

66.0

^[2]

Debt Securities, Available-for-sale [Line Items]

Corporate Credit Quality Indicator Unrated [Member] | Corporate Bond Securities [Member]

0.0

Debt Securities, Available-for-sale [Line Items]

Corporate Credit Quality Indicator Unrated [Member] | Residential Mortgage Backed Securities [Member]

0.0

Debt Securities, Available-for-sale [Line Items]

192.0

198.0

Corporate Credit Quality Indicator Unrated [Member] | Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member]

0.0

Debt Securities, Available-for-sale [Line Items]

Corporate Credit Quality Indicator Unrated [Member] | Nontaxable Municipal Bonds [Member]

0.0

Debt Securities, Available-for-sale [Line Items]

1,175.0

1,091.0

Corporate Credit Quality Indicator Unrated [Member] | US Treasury Securities [Member]

75.0

48.0

Debt Securities, Available-for-sale [Line Items]

Corporate Credit Quality Indicator Unrated [Member] | CRA investments [Member]

0.0

Debt Securities, Available-for-sale [Line Items]

Corporate Credit Quality Indicator Unrated [Member] | Preferred Stock [Member]

12.0

25.0

Debt Securities, Available-for-sale [Line Items]

Corporate Credit Quality Indicator Unrated [Member] | Collateralized Loan Obligations

10.0

9.0

Debt Securities, Available-for-sale [Line Items]

Corporate Credit Quality Indicator Unrated [Member] | Other Security Investments

0.0

Debt Securities, Available-for-sale [Line Items]

Debt Securities, Available-for-sale [Line Items]

$ 17.0

$ 18.0

[1]	ratings differ, the Company uses an average of the available ratings by major credit agencies.
[2]	For rated securities, if ratings differ, the Company uses an average of the available ratings by major credit agencies.

Investment Securities - Additional Information (Detail) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2023 USD ($) positions	Jun. 30, 2022 USD ($)	Jun. 30, 2023 USD ($) positions	Jun. 30, 2022 USD ($)	Dec. 31, 2022 USD ($) positions
Pledged Securities [Abstract]
Accrued Investment Income Receivable	$ 4,000		$ 4,000		$ 4,000
Debt Securities, Available-for-sale, Unrealized Loss Position, Number of Positions \| positions	797		797		832
Debt Securities, Available-for-sale, Realized Gain (Loss)	$ (13,600)	$ 400	$ (26,100)	$ 7,300
Debt Securities, Available-for-Sale, Pledged Status [Extensible Enumeration]	Asset Pledged as Collateral		Asset Pledged as Collateral		Asset Pledged as Collateral

Investment Securities - Unrealized Losses and Fair Value of Investment Securities in Continuous Unrealized Loss Position (Detail) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2023 USD ($) positions	Jun. 30, 2022 USD ($)	Jun. 30, 2023 USD ($) positions	Jun. 30, 2022 USD ($)	Dec. 31, 2022 USD ($) positions
Debt Securities, Available-for-sale [Line Items]
Unrealized gains (losses) on assets measured at fair value, net	$ 0.1	$ (10.0)	$ (8.4)	$ (16.7)
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	826.0		826.0		$ 890.0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	804.0		804.0		571.0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	22.0		22.0		319.0
Debt Securities, Available-for-sale, Unrealized Loss Position	6,266.0		6,266.0		6,900.0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	5,563.0		5,563.0		2,467.0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months	$ 703.0		$ 703.0		$ 4,433.0
Debt Securities, Available-for-sale, Unrealized Loss Position, Number of Positions \| positions	797		797		832
Corporate Bond Securities [Member]
Debt Securities, Available-for-sale [Line Items]
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	$ 73.0		$ 73.0		$ 39.0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	71.0		71.0		11.0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	2.0		2.0		28.0
Debt Securities, Available-for-sale, Unrealized Loss Position	335.0		335.0		383.0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	320.0		320.0		120.0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months	15.0		15.0		263.0
Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member]
Debt Securities, Available-for-sale [Line Items]
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	376.0		376.0		383.0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	368.0		368.0		301.0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	8.0		8.0		82.0
Debt Securities, Available-for-sale, Unrealized Loss Position	1,747.0		1,747.0		1,701.0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	1,508.0		1,508.0		1,101.0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months	239.0		239.0		600.0
Nontaxable Municipal Bonds [Member]
Debt Securities, Available-for-sale [Line Items]
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	89.0		89.0		115.0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	83.0		83.0		22.0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	6.0		6.0		93.0
Debt Securities, Available-for-sale, Unrealized Loss Position	825.0		825.0		830.0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	695.0		695.0		78.0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months	130.0		130.0		752.0
Residential Mortgage Backed Securities [Member]
Debt Securities, Available-for-sale [Line Items]
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	230.0		230.0		243.0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	229.0		229.0		216.0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	1.0		1.0		27.0
Debt Securities, Available-for-sale, Unrealized Loss Position	1,112.0		1,112.0		1,191.0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	1,084.0		1,084.0		912.0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months	28.0		28.0		279.0
Commercial Mortgage Backed Securities Issued By US Government Sponsored Enterprise [Member]
Debt Securities, Available-for-sale [Line Items]
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	9.0		9.0		8.0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	8.0		8.0		4.0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	1.0		1.0		4.0
Debt Securities, Available-for-sale, Unrealized Loss Position	57.0		57.0		60.0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	45.0		45.0		14.0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months	12.0		12.0		46.0
Other Security Investments
Debt Securities, Available-for-sale [Line Items]
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	10.0		10.0		12.0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	8.0		8.0		8.0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	2.0		2.0		4.0
Debt Securities, Available-for-sale, Unrealized Loss Position	54.0		54.0		52.0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	36.0		36.0		26.0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months	18.0		18.0		26.0
Collateralized Loan Obligations
Debt Securities, Available-for-sale [Line Items]
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	39.0		39.0		90.0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	37.0		37.0		9.0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	2.0		2.0		81.0
Debt Securities, Available-for-sale, Unrealized Loss Position	2,136.0		2,136.0		2,683.0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	1,875.0		1,875.0		216.0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months	$ 261.0		$ 261.0		$ 2,467.0

Investment Securities - Amortized Cost and Fair Value of Investment Securities by Contractual Maturities (Detail) - USD ($)
$ in Millions

Jun. 30, 2023

Dec. 31, 2022

Debt Securities, Held-to-maturity, Maturity, Allocated and Single Maturity Date, within One Year, Amortized Cost

$ 22

Debt Securities, Held-to-maturity, Maturity, Allocated and Single Maturity Date, after One Through Five Years, Amortized Cost

6

Debt Securities, Held-to-maturity, Maturity, Allocated and Single Maturity Date, after 10 Years, Amortized Cost

1,114

Debt Securities, Held-to-maturity, Maturity, Allocated and Single Maturity Date, within One Year, Fair Value

22

Debt Securities, Held-to-maturity, Maturity, Allocated and Single Maturity Date, after One Through Five Years, Fair Value

6

Held-to-maturity Securities, Debt Maturities, Rolling Year Six Through Ten, Fair Value

31

Debt Securities, Held-to-maturity, Maturity, Allocated and Single Maturity Date, after Five Through Ten Years, Amortized Cost

33

Debt Securities, Held-to-maturity, Maturity, Allocated and Single Maturity Date, after 10 Years, Fair Value

975

Debt Securities, Held-to-maturity, Maturity, without Single Maturity Date, Fair Value

152

Debt Securities, Held-to-maturity, Maturity, without Single Maturity Date, Amortized Cost

192

1,367

$ 1,289

Securities available for sale, Due in one year or less, Amortized Cost

1,186

1,112

2,286

Securities available for sale, After one year through five years, Amortized Cost

166

Securities available for sale, After five years through ten years, Amortized Cost

898

Securities available for sale, After ten years, Amortized Cost

2,523

Securities available for sale, Mortgage backed securities, Amortized Cost

3,581

Securities available for sale Total, Amortized Cost

9,454

7,973

Securities available for sale, Due in one year or less, Estimated Fair Value

2,285

Securities available for sale, After one year through five years, Estimated Fair Value

149

Securities available for sale, After five years through ten years, Estimated Fair Value

832

Securities available for sale, After ten years, Estimated Fair Value

2,399

Securities available for sale, Mortgage backed securities, Estimated Fair Value

2,966

Securities available for sale Total, Estimated Fair Value

$ 8,631

^[1]

$ 7,092

^[2]

[1]	ratings differ, the Company uses an average of the available ratings by major credit agencies.
[2]	For rated securities, if ratings differ, the Company uses an average of the available ratings by major credit agencies.

Investment Securities - Investment Securities by Credit Rating Type (Detail) - USD ($)
$ in Millions

Jun. 30, 2023

Dec. 31, 2022

Debt Securities, Available-for-sale [Line Items]

$ 1,367.0

$ 1,289.0

8,631.0

^[1]

7,092.0

^[2]

Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member]

139.0

^[1]

160.0

^[2]

Debt Securities, Available-for-sale [Line Items]

Nontaxable Municipal Bonds [Member]

1,765.0

1,740.0

Debt Securities, Available-for-sale [Line Items]

1,175.0

1,091.0

Commercial Mortgage Backed Securities Issued By US Government Sponsored Enterprise [Member]

830.0

891.0

Debt Securities, Available-for-sale [Line Items]

Residential Mortgage Backed Securities [Member]

60.0

97.0

Debt Securities, Available-for-sale [Line Items]

192.0

198.0

US Treasury Securities [Member]

1,141.0

1,199.0

Debt Securities, Available-for-sale [Line Items]

2,286.0

Debt Securities, Available-for-sale [Line Items]

Corporate Bond Securities [Member]

100.0

108.0

Debt Securities, Available-for-sale [Line Items]

Debt Securities, Available-for-sale [Line Items]

338.0

390.0

CRA investments [Member]

Other Security Investments

37.0

49.0

Debt Securities, Available-for-sale [Line Items]

Collateralized Loan Obligations

67.0

69.0

Debt Securities, Available-for-sale [Line Items]

Debt Securities, Available-for-sale [Line Items]

2,144.0

2,706.0

Common Stock [Member]

Debt Securities, Available-for-sale [Line Items]

2.0

3.0

A Plus to A- [Member]

0.0

519.0

^[1]

783.0

^[2]

A Plus to A- [Member] | Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member]

0.0

^[1]

0.0

^[2]

Debt Securities, Available-for-sale [Line Items]

A Plus to A- [Member] | Nontaxable Municipal Bonds [Member]

0.0

Debt Securities, Available-for-sale [Line Items]

0.0

A Plus to A- [Member] | Commercial Mortgage Backed Securities Issued By US Government Sponsored Enterprise [Member]

376.0

425.0

Debt Securities, Available-for-sale [Line Items]

A Plus to A- [Member] | Residential Mortgage Backed Securities [Member]

0.0

Debt Securities, Available-for-sale [Line Items]

0.0

A Plus to A- [Member] | US Treasury Securities [Member]

0.0

Debt Securities, Available-for-sale [Line Items]

A Plus to A- [Member] | Preferred Stock [Member]

0.0

Debt Securities, Available-for-sale [Line Items]

A Plus to A- [Member] | Corporate Bond Securities [Member]

0.0

Debt Securities, Available-for-sale [Line Items]

A Plus to A- [Member] | CRA investments [Member]

70.0

74.0

Debt Securities, Available-for-sale [Line Items]

A Plus to A- [Member] | Other Security Investments

0.0

Debt Securities, Available-for-sale [Line Items]

A Plus to A- [Member] | Collateralized Loan Obligations

9.0

Debt Securities, Available-for-sale [Line Items]

Corporate Credit Quality Indicator Unrated [Member]

64.0

275.0

Debt Securities, Available-for-sale [Line Items]

1,367.0

1,289.0

92.0

^[1]

66.0

^[2]

Corporate Credit Quality Indicator Unrated [Member] | Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member]

24.0

^[1]

37.0

^[2]

Debt Securities, Available-for-sale [Line Items]

Corporate Credit Quality Indicator Unrated [Member] | Nontaxable Municipal Bonds [Member]

0.0

Debt Securities, Available-for-sale [Line Items]

1,175.0

1,091.0

Corporate Credit Quality Indicator Unrated [Member] | Commercial Mortgage Backed Securities Issued By US Government Sponsored Enterprise [Member]

75.0

48.0

Debt Securities, Available-for-sale [Line Items]

Corporate Credit Quality Indicator Unrated [Member] | Residential Mortgage Backed Securities [Member]

0.0

Debt Securities, Available-for-sale [Line Items]

192.0

198.0

Corporate Credit Quality Indicator Unrated [Member] | US Treasury Securities [Member]

0.0

Debt Securities, Available-for-sale [Line Items]

Corporate Credit Quality Indicator Unrated [Member] | Preferred Stock [Member]

0.0

Debt Securities, Available-for-sale [Line Items]

Corporate Credit Quality Indicator Unrated [Member] | Corporate Bond Securities [Member]

10.0

9.0

Debt Securities, Available-for-sale [Line Items]

Corporate Credit Quality Indicator Unrated [Member] | CRA investments [Member]

0.0

Debt Securities, Available-for-sale [Line Items]

Corporate Credit Quality Indicator Unrated [Member] | Other Security Investments

12.0

25.0

Debt Securities, Available-for-sale [Line Items]

Corporate Credit Quality Indicator Unrated [Member] | Collateralized Loan Obligations

17.0

18.0

Debt Securities, Available-for-sale [Line Items]

Corporate Credit Quality Indicator Unrated [Member] | Common Stock [Member]

0.0

Debt Securities, Available-for-sale [Line Items]

$ 2.0

$ 3.0

[1]	ratings differ, the Company uses an average of the available ratings by major credit agencies.
[2]	For rated securities, if ratings differ, the Company uses an average of the available ratings by major credit agencies.

Investment Securities - Gross Gains and (Losses) on Sales of Investments (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Investments, Debt and Equity Securities [Abstract]
Debt Securities, Available-for-sale, Realized Gain (Loss)	$ (13,600)	$ 400	$ (26,100)	$ 7,300
Equity Securities, FV-NI, Realized Gain	0	0	0	0
Equity Securities, FV-NI, Realized Loss	0	600	0	600
Less: Net gains (losses) recognized on equity securities sold	0	(600)	0	(600)
Debt Securities, Available-for-Sale, Realized Gain	100	400	3,500	7,300
Debt Securities, Available-for-Sale, Realized Loss	$ (13,700)	0	$ (29,600)	0
Debt Securities, Held-to-maturity, Allowance for Credit Loss [Line Items]
Debt and Equity Securities, Realized Gain (Loss)		$ (200)		$ 6,700

Amount of realized gain (loss) on investment in debt and equity securities.

Share-based Compensation Arrangement by Share-based Payment Award [Line Items]

Investment Securities Investment Securities - Allowance for Credit Losses - HTM (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022	Mar. 31, 2023	Dec. 31, 2022	Mar. 31, 2022	Dec. 31, 2021
Debt Securities, Held-to-maturity, Allowance for Credit Loss [Line Items]
Debt Securities, Held-to-Maturity, Allowance for Credit Loss, Excluding Accrued Interest	$ 6.0	$ 3.2	$ 6.0	$ 3.2	$ 6.5	$ 5.2	$ 3.2	$ 5.2
Debt Securities, Held-to-Maturity, Excluding Accrued Interest, Credit Loss Expense (Reversal)	0.5	0.0	(0.8)	(2.0)
Debt Securities, Held-to-Maturity, Excluding Accrued Interest, Allowance for Credit Loss, Writeoff	0.0	0.0	0.0	0.0
Debt Securities, Held-to-Maturity, Excluding Accrued Interest, Allowance for Credit Loss, Recovery	0.0	$ 0.0	0.0	$ 0.0
Accrued Investment Income Receivable	4.0		4.0			4.0
Debt Securities, Available-for-Sale, Excluding Accrued Interest, Allowance for Credit Loss, Writeoff	0.0		17.1
Debt Securities, Available-for-Sale, Excluding Accrued Interest, Allowance for Credit Loss, Recovery	0.0		0.0
Debt Securities, Available-for-Sale, Allowance for Credit Loss, Excluding Accrued Interest	4.4		4.4		$ 2.2	$ 0.0
Debt Securities, Available-for-Sale, Excluding Accrued Interest, Allowance for Credit Loss, Not Previously Recorded	$ (2.2)		$ (21.5)

Loans Held For Sale (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
Loans Held For Sale (Details) - USD ($) $ in Millions	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022	Dec. 31, 2022
Loans and Leases Receivable Disclosure [Line Items]
Loans Receivable Held-for-sale, Amount	$ 3,156.0		$ 3,156.0		$ 1,184.0
Proceeds from Sale of Mortgage Loans Held-for-sale	(230.6)	$ (361.7)	(338.0)	$ (698.6)
MSR capitalized upon sale of loan	244.8	193.4	387.2	397.5
Provision for and change in estimate of liability for losses under representations and warranties	0.3	0.8	2.7	1.6
Change in fair value of loans held for sale	(9.7)	59.3	(3.1)	(6.9)
Unrealized Gain (Loss) on Derivatives	37.2	(49.8)	15.0	31.4
Derivative Instruments Not Designated as Hedging Instruments, Gain	4.9	167.9	2.5	303.5
Derivative, Gain (Loss) on Derivative, Net	42.1	118.1	17.5	334.9
Gain (Loss) on Sales of Loans, Net	46.9	9.9	66.3	28.5
Loan acquisition and origination fees	15.4	17.3	27.4	35.6
Net gain on loan origination and sale activities	62.3	$ 27.2	93.7	$ 64.1
Purchased from Ginnie Mae
Loans and Leases Receivable Disclosure [Line Items]
Loans Receivable Held-for-sale, Amount	3.0		3.0		0.0
Purchased from correspondent seller
Loans and Leases Receivable Disclosure [Line Items]
Loans Receivable Held-for-sale, Amount	816.0		816.0		591.0
Loans Insured or Guaranteed by US Government Authorities
Loans and Leases Receivable Disclosure [Line Items]
Loans Receivable Held-for-sale, Amount	819.0		819.0		591.0
US Government Agency Insured Loans
Loans and Leases Receivable Disclosure [Line Items]
Loans Receivable Held-for-sale, Amount	538.0		538.0		593.0
Commercial Real Estate [Member]
Loans and Leases Receivable Disclosure [Line Items]
Loans Receivable Held-for-sale, Amount	134.0		134.0		0.0
Commercial and industrial
Loans and Leases Receivable Disclosure [Line Items]
Loans Receivable Held-for-sale, Amount	1,619.0		1,619.0		0.0
Residential Real Estate [Member]
Loans and Leases Receivable Disclosure [Line Items]
Loans Receivable Held-for-sale, Amount	$ 46.0		$ 46.0		$ 0.0

Loans, Leases and Allowance for Credit Losses - Schedule of Held for Investment Loan Portfolio Composition of Loans, Leases and Allowance for Credit Losses (Detail) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022	Mar. 31, 2023	Dec. 31, 2022	Mar. 31, 2022	Dec. 31, 2021
Financing Receivable, Allowance for Credit Loss [Line Items]
Loans and Leases Receivable, Net of Deferred Income	$ 47,875.0		$ 47,875.0			$ 51,862.0
Loans and Leases Receivable, Allowance	(321.1)	$ (273.2)	(321.1)	$ (273.2)	$ (304.7)	(309.7)	$ (257.6)	$ (252.5)
Loans, net	47,554.0		47,554.0			51,552.0
Net deferred loan fees and costs	(115.0)		(115.0)			(141.0)
Receivable with Imputed Interest, Premium	187.0		187.0			195.0
Loans Receivable Held-for-sale, Amount	3,156.0		3,156.0			1,184.0
Provision for Loan and Lease Losses	(23.8)	(17.0)	(24.8)	(22.3)
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss, Writeoff	8.2	2.4	17.4	5.0
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss, Recovery	(0.8)	(1.0)	(4.0)	(3.4)
Warehouse lending [Member]
Financing Receivable, Allowance for Credit Loss [Line Items]
Loans and Leases Receivable, Net of Deferred Income	5,549.0		5,549.0			5,561.0
Loans and Leases Receivable, Allowance	(5.2)	(3.7)	(5.2)	(3.7)	(6.6)	(8.4)	(2.9)	(3.0)
Provision for Loan and Lease Losses	(1.4)	0.8	(3.2)	0.7
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss, Writeoff	0.0	0.0	0.0	0.0
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss, Recovery	0.0	0.0	0.0	0.0
Municipal and nonprofit [Member]
Financing Receivable, Allowance for Credit Loss [Line Items]
Loans and Leases Receivable, Net of Deferred Income	1,558.0		1,558.0			1,524.0
Loans and Leases Receivable, Allowance	(16.5)	(13.6)	(16.5)	(13.6)	(18.4)	(15.9)	(13.4)	(13.7)
Provision for Loan and Lease Losses	1.9	0.2	(0.6)	(0.1)
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss, Writeoff	0.0	0.0	0.0	0.0
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss, Recovery	0.0	0.0	0.0	0.0
Tech & Innovation [Member]
Financing Receivable, Allowance for Credit Loss [Line Items]
Loans and Leases Receivable, Net of Deferred Income	2,401.0		2,401.0			2,293.0
Loans and Leases Receivable, Allowance	(33.6)	(25.4)	(33.6)	(25.4)	(36.4)	(30.8)	(28.0)	(25.7)
Provision for Loan and Lease Losses	2.8	2.6	(4.6)	2.3
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss, Writeoff	0.0	0.0	1.8	0.0
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss, Recovery	0.0	0.0	0.0	(2.0)
Equity fund resources
Financing Receivable, Allowance for Credit Loss [Line Items]
Loans and Leases Receivable, Net of Deferred Income	931.0		931.0			3,717.0
Loans and Leases Receivable, Allowance	(1.7)	(14.0)	(1.7)	(14.0)	(3.3)	(6.4)	(6.6)	(9.6)
Provision for Loan and Lease Losses	(1.6)	7.4	(4.7)	4.4
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss, Writeoff	0.0	0.0	0.0	0.0
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss, Recovery	0.0	0.0	0.0	0.0
Other commercial and industrial [Member]
Financing Receivable, Allowance for Credit Loss [Line Items]
Loans and Leases Receivable, Net of Deferred Income	6,396.0		6,396.0			7,793.0
Loans and Leases Receivable, Allowance	(51.8)	(119.2)	(51.8)	(119.2)	(51.1)	(85.9)	(115.7)	(103.6)
Provision for Loan and Lease Losses	5.9	(5.1)	(24.8)	(19.4)
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss, Writeoff	6.0	2.3	13.3	4.9
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss, Recovery	(0.8)	(0.7)	(4.0)	(1.1)
Commercial Real Estate Owner Occupied [Member]
Financing Receivable, Allowance for Credit Loss [Line Items]
Loans and Leases Receivable, Net of Deferred Income	1,648.0		1,648.0			1,656.0
Loans and Leases Receivable, Allowance	(8.0)	(7.5)	(8.0)	(7.5)	(8.6)	(7.1)	(8.1)	(10.6)
Provision for Loan and Lease Losses	0.6	(0.7)	(0.9)	(3.2)
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss, Writeoff	0.0	0.0	0.0	0.0
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss, Recovery	0.0	(0.1)	0.0	(0.1)
Hotel franchise finance [Member]
Financing Receivable, Allowance for Credit Loss [Line Items]
Loans and Leases Receivable, Net of Deferred Income	4,101.0		4,101.0			3,807.0
Loans and Leases Receivable, Allowance	(45.7)	(33.8)	(45.7)	(33.8)	(47.7)	(46.9)	(30.6)	(41.5)
Provision for Loan and Lease Losses	2.0	3.2	1.2	(7.7)
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss, Writeoff	0.0	0.0	0.0	0.0
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss, Recovery	0.0	0.0	0.0	0.0
Other Commercial Real Estate Non owner Occupied [Member]
Financing Receivable, Allowance for Credit Loss [Line Items]
Loans and Leases Receivable, Net of Deferred Income	5,792.0		5,792.0			5,457.0
Loans and Leases Receivable, Allowance	(90.1)	(22.1)	(90.1)	(22.1)	(66.4)	(47.4)	(15.3)	(16.9)
Provision for Loan and Lease Losses	(25.9)	6.8	(44.9)	5.2
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss, Writeoff	2.2	0.0	2.2	0.0
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss, Recovery	0.0	0.0	0.0	0.0
Residential Real Estate [Member]
Financing Receivable, Allowance for Credit Loss [Line Items]
Loans and Leases Receivable, Net of Deferred Income	13,502.0		13,502.0			13,996.0
Loans and Leases Receivable, Allowance	(33.9)	(18.8)	(33.9)	(18.8)	(31.7)	(30.4)	(23.8)	(12.5)
Provision for Loan and Lease Losses	(2.2)	5.0	(3.5)	(6.3)
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss, Writeoff	0.0	0.0	0.0	0.0
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss, Recovery	0.0	0.0	0.0	0.0
Residential - EBO
Financing Receivable, Allowance for Credit Loss [Line Items]
Loans and Leases Receivable, Net of Deferred Income	1,432.0		1,432.0			1,884.0
Loans and Leases Receivable, Allowance	0.0		0.0		0.0	0.0
Provision for Loan and Lease Losses	0.0		0.0
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss, Writeoff	0.0		0.0
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss, Recovery	0.0		0.0
Construction And Land Development Land [Member]
Financing Receivable, Allowance for Credit Loss [Line Items]
Loans and Leases Receivable, Net of Deferred Income	4,403.0		4,403.0			3,995.0
Other, loan segment
Financing Receivable, Allowance for Credit Loss [Line Items]
Loans and Leases Receivable, Net of Deferred Income	162.0		162.0			179.0
Loans and Leases Receivable, Allowance	(2.9)	(2.9)	(2.9)	(2.9)	(3.0)	(3.1)	(2.5)	(2.9)
Provision for Loan and Lease Losses	(0.1)	0.3	(0.1)	(0.1)
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss, Writeoff	0.0	0.1	0.1	0.1
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss, Recovery	0.0	(0.2)	0.0	(0.2)
Construction And Land Development [Member]
Financing Receivable, Allowance for Credit Loss [Line Items]
Loans and Leases Receivable, Net of Deferred Income	4,403.0		4,403.0			3,995.0
Loans and Leases Receivable, Allowance	(31.7)	(12.2)	(31.7)	(12.2)	$ (31.5)	$ (27.4)	$ (10.7)	$ (12.5)
Provision for Loan and Lease Losses	(0.2)	1.5	(4.3)	(0.3)
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss, Writeoff	0.0	0.0	0.0	0.0
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss, Recovery	$ 0.0	$ 0.0	$ 0.0	$ 0.0

Loans, Leases and Allowance for Credit Losses - Summary of Recorded Investment in Nonaccrual Loans and Loans Past Due 90 Days Still Accruing Interest by Loan Class (Detail) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022	Dec. 31, 2022
Financing Receivable, Nonaccrual [Line Items]
Nonaccrual with an Allowance for Credit Loss	$ 172.0		$ 172.0		$ 65.0
Financing Receivable, Excluding Accrued Interest, 90 Days or More Past Due, Still Accruing	481.0		481.0		582.0
Financing Receivable, Excluding Accrued Interest, Nonaccrual	256.0		256.0		85.0
Financing Receivable, Excluding Accrued Interest, Nonaccrual, No Allowance	84.0		84.0		20.0
Loans Receivable Held-for-sale, Amount	3,156.0		3,156.0		1,184.0
Loans and Leases Receivable, Impaired, Interest Lost on Nonaccrual Loans	2.8	$ 1.2	3.6	$ 2.3
Loans and Leases Receivable, Net of Deferred Income	47,875.0		47,875.0		51,862.0
Warehouse lending [Member]
Financing Receivable, Nonaccrual [Line Items]
Loans and Leases Receivable, Net of Deferred Income	5,549.0		5,549.0		5,561.0
Municipal and nonprofit [Member]
Financing Receivable, Nonaccrual [Line Items]
Nonaccrual with an Allowance for Credit Loss	7.0		7.0		7.0
Financing Receivable, Excluding Accrued Interest, 90 Days or More Past Due, Still Accruing	0.0		0.0		0.0
Financing Receivable, Excluding Accrued Interest, Nonaccrual	13.0		13.0		7.0
Financing Receivable, Excluding Accrued Interest, Nonaccrual, No Allowance	6.0		6.0		0.0
Loans and Leases Receivable, Net of Deferred Income	1,558.0		1,558.0		1,524.0
Tech & Innovation [Member]
Financing Receivable, Nonaccrual [Line Items]
Nonaccrual with an Allowance for Credit Loss	7.0		7.0		1.0
Financing Receivable, Excluding Accrued Interest, 90 Days or More Past Due, Still Accruing	0.0		0.0		0.0
Financing Receivable, Excluding Accrued Interest, Nonaccrual	7.0		7.0		1.0
Financing Receivable, Excluding Accrued Interest, Nonaccrual, No Allowance	0.0		0.0		0.0
Loans and Leases Receivable, Net of Deferred Income	2,401.0		2,401.0		2,293.0
Equity fund resources
Financing Receivable, Nonaccrual [Line Items]
Loans and Leases Receivable, Net of Deferred Income	931.0		931.0		3,717.0
Other commercial and industrial [Member]
Financing Receivable, Nonaccrual [Line Items]
Nonaccrual with an Allowance for Credit Loss	23.0		23.0		23.0
Financing Receivable, Excluding Accrued Interest, 90 Days or More Past Due, Still Accruing	0.0		0.0		0.0
Financing Receivable, Excluding Accrued Interest, Nonaccrual	82.0		82.0		24.0
Financing Receivable, Excluding Accrued Interest, Nonaccrual, No Allowance	59.0		59.0		1.0
Loans and Leases Receivable, Net of Deferred Income	6,396.0		6,396.0		7,793.0
Commercial Real Estate Owner Occupied [Member]
Financing Receivable, Nonaccrual [Line Items]
Nonaccrual with an Allowance for Credit Loss	2.0		2.0		2.0
Financing Receivable, Excluding Accrued Interest, 90 Days or More Past Due, Still Accruing	0.0		0.0		0.0
Financing Receivable, Excluding Accrued Interest, Nonaccrual	18.0		18.0		12.0
Financing Receivable, Excluding Accrued Interest, Nonaccrual, No Allowance	16.0		16.0		10.0
Loans and Leases Receivable, Net of Deferred Income	1,648.0		1,648.0		1,656.0
Hotel franchise finance [Member]
Financing Receivable, Nonaccrual [Line Items]
Nonaccrual with an Allowance for Credit Loss					10.0
Financing Receivable, Excluding Accrued Interest, 90 Days or More Past Due, Still Accruing					0.0
Financing Receivable, Excluding Accrued Interest, Nonaccrual					10.0
Financing Receivable, Excluding Accrued Interest, Nonaccrual, No Allowance					0.0
Loans and Leases Receivable, Net of Deferred Income	4,101.0		4,101.0		3,807.0
Other Commercial Real Estate Non owner Occupied [Member]
Financing Receivable, Nonaccrual [Line Items]
Nonaccrual with an Allowance for Credit Loss	75.0		75.0		3.0
Financing Receivable, Excluding Accrued Interest, 90 Days or More Past Due, Still Accruing	0.0		0.0		0.0
Financing Receivable, Excluding Accrued Interest, Nonaccrual	78.0		78.0		8.0
Financing Receivable, Excluding Accrued Interest, Nonaccrual, No Allowance	3.0		3.0		5.0
Loans and Leases Receivable, Net of Deferred Income	5,792.0		5,792.0		5,457.0
Residential Real Estate [Member]
Financing Receivable, Nonaccrual [Line Items]
Nonaccrual with an Allowance for Credit Loss	58.0		58.0		19.0
Financing Receivable, Excluding Accrued Interest, 90 Days or More Past Due, Still Accruing	0.0		0.0		0.0
Financing Receivable, Excluding Accrued Interest, Nonaccrual	58.0		58.0		19.0
Financing Receivable, Excluding Accrued Interest, Nonaccrual, No Allowance	0.0		0.0		0.0
Loans and Leases Receivable, Net of Deferred Income	13,502.0		13,502.0		13,996.0
Residential - EBO
Financing Receivable, Nonaccrual [Line Items]
Nonaccrual with an Allowance for Credit Loss	0.0		0.0		0.0
Financing Receivable, Excluding Accrued Interest, 90 Days or More Past Due, Still Accruing	481.0		481.0		582.0
Financing Receivable, Excluding Accrued Interest, Nonaccrual	0.0		0.0		0.0
Financing Receivable, Excluding Accrued Interest, Nonaccrual, No Allowance	0.0		0.0		0.0
Loans and Leases Receivable, Net of Deferred Income	1,432.0		1,432.0		1,884.0
Construction And Land Development [Member]
Financing Receivable, Nonaccrual [Line Items]
Nonaccrual with an Allowance for Credit Loss					0.0
Financing Receivable, Excluding Accrued Interest, 90 Days or More Past Due, Still Accruing					0.0
Financing Receivable, Excluding Accrued Interest, Nonaccrual					4.0
Financing Receivable, Excluding Accrued Interest, Nonaccrual, No Allowance					4.0
Loans and Leases Receivable, Net of Deferred Income	4,403.0		4,403.0		3,995.0
Construction And Land Development Land [Member]
Financing Receivable, Nonaccrual [Line Items]
Loans and Leases Receivable, Net of Deferred Income	4,403.0		4,403.0		3,995.0
Other, loan segment
Financing Receivable, Nonaccrual [Line Items]
Loans and Leases Receivable, Net of Deferred Income	$ 162.0		$ 162.0		$ 179.0

Contractual Aging of Loan Portfolio by Segment (Detail) - USD ($) $ in Millions	Jun. 30, 2023	Dec. 31, 2022
Financing Receivable, Nonaccrual [Line Items]
Loans and Leases Receivable, Net of Deferred Income	$ 47,875	$ 51,862
Financing Receivable, Originated in Current Fiscal Year	4,239	15,460
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	13,131	15,098
Financing Receivable, Originated Two Years before Latest Fiscal Year	12,461	3,997
Financing Receivable, Originated Three Years before Latest Fiscal Year	3,457	2,319
Financing Receivable, Originated Four Years before Latest Fiscal Year	1,863	1,427
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	2,908	2,216
Financing Receivable, Revolving	9,816	11,345
Pass [Member]
Financing Receivable, Nonaccrual [Line Items]
Loans and Leases Receivable, Net of Deferred Income	46,601	51,145
Financing Receivable, Originated in Current Fiscal Year	4,154	15,349
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	12,836	14,914
Financing Receivable, Originated Two Years before Latest Fiscal Year	12,094	3,853
Financing Receivable, Originated Three Years before Latest Fiscal Year	3,263	2,167
Financing Receivable, Originated Four Years before Latest Fiscal Year	1,653	1,363
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	2,830	2,191
Financing Receivable, Revolving	9,771	11,308
Special Mention [Member]
Financing Receivable, Nonaccrual [Line Items]
Loans and Leases Receivable, Net of Deferred Income	694	351
Financing Receivable, Originated in Current Fiscal Year	49	82
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	236	104
Financing Receivable, Originated Two Years before Latest Fiscal Year	132	127
Financing Receivable, Originated Three Years before Latest Fiscal Year	156	12
Financing Receivable, Originated Four Years before Latest Fiscal Year	70	0
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	33	2
Financing Receivable, Revolving	18	24
Substandard [Member]
Financing Receivable, Nonaccrual [Line Items]
Loans and Leases Receivable, Net of Deferred Income	580	366
Financing Receivable, Originated in Current Fiscal Year	36	29
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	59	80
Financing Receivable, Originated Two Years before Latest Fiscal Year	235	17
Financing Receivable, Originated Three Years before Latest Fiscal Year	38	140
Financing Receivable, Originated Four Years before Latest Fiscal Year	140	64
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	45	23
Financing Receivable, Revolving	27	13
Warehouse lending [Member]
Financing Receivable, Nonaccrual [Line Items]
Loans and Leases Receivable, Net of Deferred Income	5,549	5,561
Financing Receivable, Originated in Current Fiscal Year	387	440
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	248	41
Financing Receivable, Originated Two Years before Latest Fiscal Year	320	152
Financing Receivable, Originated Three Years before Latest Fiscal Year	293	0
Financing Receivable, Originated Four Years before Latest Fiscal Year	0	0
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	0	0
Financing Receivable, Revolving	4,301	4,928
Warehouse lending [Member] \| Pass [Member]
Financing Receivable, Nonaccrual [Line Items]
Loans and Leases Receivable, Net of Deferred Income	5,549	5,518
Financing Receivable, Originated in Current Fiscal Year	387	397
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	248	41
Financing Receivable, Originated Two Years before Latest Fiscal Year	320	152
Financing Receivable, Originated Three Years before Latest Fiscal Year	293	0
Financing Receivable, Originated Four Years before Latest Fiscal Year	0	0
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	0	0
Financing Receivable, Revolving	4,301	4,928
Warehouse lending [Member] \| Special Mention [Member]
Financing Receivable, Nonaccrual [Line Items]
Loans and Leases Receivable, Net of Deferred Income	0	43
Financing Receivable, Originated in Current Fiscal Year	0	43
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	0	0
Financing Receivable, Originated Two Years before Latest Fiscal Year	0	0
Financing Receivable, Originated Three Years before Latest Fiscal Year	0	0
Financing Receivable, Originated Four Years before Latest Fiscal Year	0	0
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	0	0
Financing Receivable, Revolving	0	0
Warehouse lending [Member] \| Substandard [Member]
Financing Receivable, Nonaccrual [Line Items]
Loans and Leases Receivable, Net of Deferred Income	0	0
Financing Receivable, Originated in Current Fiscal Year	0	0
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	0	0
Financing Receivable, Originated Two Years before Latest Fiscal Year	0	0
Financing Receivable, Originated Three Years before Latest Fiscal Year	0	0
Financing Receivable, Originated Four Years before Latest Fiscal Year	0	0
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	0	0
Financing Receivable, Revolving	0	0
Municipal and nonprofit [Member]
Financing Receivable, Nonaccrual [Line Items]
Loans and Leases Receivable, Net of Deferred Income	1,558	1,524
Financing Receivable, Originated in Current Fiscal Year	25	107
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	138	185
Financing Receivable, Originated Two Years before Latest Fiscal Year	187	187
Financing Receivable, Originated Three Years before Latest Fiscal Year	186	78
Financing Receivable, Originated Four Years before Latest Fiscal Year	77	43
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	945	924
Financing Receivable, Revolving	0	0
Municipal and nonprofit [Member] \| Pass [Member]
Financing Receivable, Nonaccrual [Line Items]
Loans and Leases Receivable, Net of Deferred Income	1,527	1,517
Financing Receivable, Originated in Current Fiscal Year	25	107
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	131	185
Financing Receivable, Originated Two Years before Latest Fiscal Year	187	187
Financing Receivable, Originated Three Years before Latest Fiscal Year	186	78
Financing Receivable, Originated Four Years before Latest Fiscal Year	71	43
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	927	917
Financing Receivable, Revolving	0	0
Municipal and nonprofit [Member] \| Special Mention [Member]
Financing Receivable, Nonaccrual [Line Items]
Loans and Leases Receivable, Net of Deferred Income	18	0
Financing Receivable, Originated in Current Fiscal Year	0	0
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	7	0
Financing Receivable, Originated Two Years before Latest Fiscal Year	0	0
Financing Receivable, Originated Three Years before Latest Fiscal Year	0	0
Financing Receivable, Originated Four Years before Latest Fiscal Year	0	0
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	11	0
Financing Receivable, Revolving	0	0
Municipal and nonprofit [Member] \| Substandard [Member]
Financing Receivable, Nonaccrual [Line Items]
Loans and Leases Receivable, Net of Deferred Income	13	7
Financing Receivable, Originated in Current Fiscal Year	0	0
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	0	0
Financing Receivable, Originated Two Years before Latest Fiscal Year	0	0
Financing Receivable, Originated Three Years before Latest Fiscal Year	0	0
Financing Receivable, Originated Four Years before Latest Fiscal Year	6	0
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	7	7
Financing Receivable, Revolving	0	0
Tech & Innovation [Member]
Financing Receivable, Nonaccrual [Line Items]
Loans and Leases Receivable, Net of Deferred Income	2,401	2,293
Financing Receivable, Originated in Current Fiscal Year	244	851
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	811	408
Financing Receivable, Originated Two Years before Latest Fiscal Year	281	90
Financing Receivable, Originated Three Years before Latest Fiscal Year	86	66
Financing Receivable, Originated Four Years before Latest Fiscal Year	53	4
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	1	1
Financing Receivable, Revolving	925	873
Tech & Innovation [Member] \| Pass [Member]
Financing Receivable, Nonaccrual [Line Items]
Loans and Leases Receivable, Net of Deferred Income	2,314	2,198
Financing Receivable, Originated in Current Fiscal Year	226	813
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	774	374
Financing Receivable, Originated Two Years before Latest Fiscal Year	275	87
Financing Receivable, Originated Three Years before Latest Fiscal Year	77	66
Financing Receivable, Originated Four Years before Latest Fiscal Year	53	4
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	1	1
Financing Receivable, Revolving	908	853
Tech & Innovation [Member] \| Special Mention [Member]
Financing Receivable, Nonaccrual [Line Items]
Loans and Leases Receivable, Net of Deferred Income	67	81
Financing Receivable, Originated in Current Fiscal Year	12	36
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	32	22
Financing Receivable, Originated Two Years before Latest Fiscal Year	0	3
Financing Receivable, Originated Three Years before Latest Fiscal Year	6	0
Financing Receivable, Originated Four Years before Latest Fiscal Year	0	0
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	0	0
Financing Receivable, Revolving	17	20
Tech & Innovation [Member] \| Substandard [Member]
Financing Receivable, Nonaccrual [Line Items]
Loans and Leases Receivable, Net of Deferred Income	20	14
Financing Receivable, Originated in Current Fiscal Year	6	2
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	5	12
Financing Receivable, Originated Two Years before Latest Fiscal Year	6	0
Financing Receivable, Originated Three Years before Latest Fiscal Year	3	0
Financing Receivable, Originated Four Years before Latest Fiscal Year	0	0
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	0	0
Financing Receivable, Revolving	0	0
Equity fund resources
Financing Receivable, Nonaccrual [Line Items]
Loans and Leases Receivable, Net of Deferred Income	931	3,717
Financing Receivable, Originated in Current Fiscal Year	116	1,020
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	89	1,189
Financing Receivable, Originated Two Years before Latest Fiscal Year	48	191
Financing Receivable, Originated Three Years before Latest Fiscal Year	3	16
Financing Receivable, Originated Four Years before Latest Fiscal Year	12	0
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	4	0
Financing Receivable, Revolving	659	1,301
Equity fund resources \| Pass [Member]
Financing Receivable, Nonaccrual [Line Items]
Loans and Leases Receivable, Net of Deferred Income	931	3,717
Financing Receivable, Originated in Current Fiscal Year	116	1,020
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	89	1,189
Financing Receivable, Originated Two Years before Latest Fiscal Year	48	191
Financing Receivable, Originated Three Years before Latest Fiscal Year	3	16
Financing Receivable, Originated Four Years before Latest Fiscal Year	12	0
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	4	0
Financing Receivable, Revolving	659	1,301
Equity fund resources \| Special Mention [Member]
Financing Receivable, Nonaccrual [Line Items]
Loans and Leases Receivable, Net of Deferred Income	0	0
Financing Receivable, Originated in Current Fiscal Year	0	0
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	0	0
Financing Receivable, Originated Two Years before Latest Fiscal Year	0	0
Financing Receivable, Originated Three Years before Latest Fiscal Year	0	0
Financing Receivable, Originated Four Years before Latest Fiscal Year	0	0
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	0	0
Financing Receivable, Revolving	0	0
Equity fund resources \| Substandard [Member]
Financing Receivable, Nonaccrual [Line Items]
Loans and Leases Receivable, Net of Deferred Income	0	0
Financing Receivable, Originated in Current Fiscal Year	0	0
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	0	0
Financing Receivable, Originated Two Years before Latest Fiscal Year	0	0
Financing Receivable, Originated Three Years before Latest Fiscal Year	0	0
Financing Receivable, Originated Four Years before Latest Fiscal Year	0	0
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	0	0
Financing Receivable, Revolving	0	0
Other commercial and industrial [Member]
Financing Receivable, Nonaccrual [Line Items]
Loans and Leases Receivable, Net of Deferred Income	6,396	7,793
Financing Receivable, Originated in Current Fiscal Year	980	2,971
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	1,878	1,337
Financing Receivable, Originated Two Years before Latest Fiscal Year	575	272
Financing Receivable, Originated Three Years before Latest Fiscal Year	197	280
Financing Receivable, Originated Four Years before Latest Fiscal Year	113	315
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	285	207
Financing Receivable, Revolving	2,368	2,411
Other commercial and industrial [Member] \| Pass [Member]
Financing Receivable, Nonaccrual [Line Items]
Loans and Leases Receivable, Net of Deferred Income	6,229	7,703
Financing Receivable, Originated in Current Fiscal Year	961	2,968
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	1,804	1,272
Financing Receivable, Originated Two Years before Latest Fiscal Year	513	262
Financing Receivable, Originated Three Years before Latest Fiscal Year	194	277
Financing Receivable, Originated Four Years before Latest Fiscal Year	112	312
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	284	206
Financing Receivable, Revolving	2,361	2,406
Other commercial and industrial [Member] \| Special Mention [Member]
Financing Receivable, Nonaccrual [Line Items]
Loans and Leases Receivable, Net of Deferred Income	81	47
Financing Receivable, Originated in Current Fiscal Year	19	0
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	47	44
Financing Receivable, Originated Two Years before Latest Fiscal Year	15	0
Financing Receivable, Originated Three Years before Latest Fiscal Year	0	0
Financing Receivable, Originated Four Years before Latest Fiscal Year	0	0
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	0	0
Financing Receivable, Revolving	0	3
Other commercial and industrial [Member] \| Substandard [Member]
Financing Receivable, Nonaccrual [Line Items]
Loans and Leases Receivable, Net of Deferred Income	86	43
Financing Receivable, Originated in Current Fiscal Year	0	3
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	27	21
Financing Receivable, Originated Two Years before Latest Fiscal Year	47	10
Financing Receivable, Originated Three Years before Latest Fiscal Year	3	3
Financing Receivable, Originated Four Years before Latest Fiscal Year	1	3
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	1	1
Financing Receivable, Revolving	7	2
Commercial Real Estate Owner Occupied [Member]
Financing Receivable, Nonaccrual [Line Items]
Loans and Leases Receivable, Net of Deferred Income	1,648	1,656
Financing Receivable, Originated in Current Fiscal Year	62	338
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	349	373
Financing Receivable, Originated Two Years before Latest Fiscal Year	365	181
Financing Receivable, Originated Three Years before Latest Fiscal Year	172	158
Financing Receivable, Originated Four Years before Latest Fiscal Year	147	216
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	518	350
Financing Receivable, Revolving	35	40
Commercial Real Estate Owner Occupied [Member] \| Pass [Member]
Financing Receivable, Nonaccrual [Line Items]
Loans and Leases Receivable, Net of Deferred Income	1,621	1,607
Financing Receivable, Originated in Current Fiscal Year	57	338
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	349	359
Financing Receivable, Originated Two Years before Latest Fiscal Year	359	174
Financing Receivable, Originated Three Years before Latest Fiscal Year	169	157
Financing Receivable, Originated Four Years before Latest Fiscal Year	142	211
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	510	339
Financing Receivable, Revolving	35	29
Commercial Real Estate Owner Occupied [Member] \| Special Mention [Member]
Financing Receivable, Nonaccrual [Line Items]
Loans and Leases Receivable, Net of Deferred Income	4	1
Financing Receivable, Originated in Current Fiscal Year	2	0
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	0	0
Financing Receivable, Originated Two Years before Latest Fiscal Year	0	0
Financing Receivable, Originated Three Years before Latest Fiscal Year	0	0
Financing Receivable, Originated Four Years before Latest Fiscal Year	1	0
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	1	1
Financing Receivable, Revolving	0	0
Commercial Real Estate Owner Occupied [Member] \| Substandard [Member]
Financing Receivable, Nonaccrual [Line Items]
Loans and Leases Receivable, Net of Deferred Income	23	48
Financing Receivable, Originated in Current Fiscal Year	3	0
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	0	14
Financing Receivable, Originated Two Years before Latest Fiscal Year	6	7
Financing Receivable, Originated Three Years before Latest Fiscal Year	3	1
Financing Receivable, Originated Four Years before Latest Fiscal Year	4	5
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	7	10
Financing Receivable, Revolving	0	11
Hotel franchise finance [Member]
Financing Receivable, Nonaccrual [Line Items]
Loans and Leases Receivable, Net of Deferred Income	4,101	3,807
Financing Receivable, Originated in Current Fiscal Year	466	1,780
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	1,760	746
Financing Receivable, Originated Two Years before Latest Fiscal Year	723	80
Financing Receivable, Originated Three Years before Latest Fiscal Year	121	645
Financing Receivable, Originated Four Years before Latest Fiscal Year	617	335
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	296	103
Financing Receivable, Revolving	118	118
Hotel franchise finance [Member] \| Pass [Member]
Financing Receivable, Nonaccrual [Line Items]
Loans and Leases Receivable, Net of Deferred Income	3,782	3,581
Financing Receivable, Originated in Current Fiscal Year	439	1,762
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	1,751	726
Financing Receivable, Originated Two Years before Latest Fiscal Year	663	54
Financing Receivable, Originated Three Years before Latest Fiscal Year	95	528
Financing Receivable, Originated Four Years before Latest Fiscal Year	465	290
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	251	103
Financing Receivable, Revolving	118	118
Hotel franchise finance [Member] \| Special Mention [Member]
Financing Receivable, Nonaccrual [Line Items]
Loans and Leases Receivable, Net of Deferred Income	101	26
Financing Receivable, Originated in Current Fiscal Year	0	0
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	0	0
Financing Receivable, Originated Two Years before Latest Fiscal Year	40	26
Financing Receivable, Originated Three Years before Latest Fiscal Year	0	0
Financing Receivable, Originated Four Years before Latest Fiscal Year	40	0
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	21	0
Financing Receivable, Revolving	0	0
Hotel franchise finance [Member] \| Substandard [Member]
Financing Receivable, Nonaccrual [Line Items]
Loans and Leases Receivable, Net of Deferred Income	218	200
Financing Receivable, Originated in Current Fiscal Year	27	18
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	9	20
Financing Receivable, Originated Two Years before Latest Fiscal Year	20	0
Financing Receivable, Originated Three Years before Latest Fiscal Year	26	117
Financing Receivable, Originated Four Years before Latest Fiscal Year	112	45
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	24	0
Financing Receivable, Revolving	0	0
Other Commercial Real Estate Non owner Occupied [Member]
Financing Receivable, Nonaccrual [Line Items]
Loans and Leases Receivable, Net of Deferred Income	5,792	5,457
Financing Receivable, Originated in Current Fiscal Year	1,044	2,347
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	2,271	1,243
Financing Receivable, Originated Two Years before Latest Fiscal Year	940	870
Financing Receivable, Originated Three Years before Latest Fiscal Year	708	288
Financing Receivable, Originated Four Years before Latest Fiscal Year	262	170
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	281	223
Financing Receivable, Revolving	286	316
Other Commercial Real Estate Non owner Occupied [Member] \| Pass [Member]
Financing Receivable, Nonaccrual [Line Items]
Loans and Leases Receivable, Net of Deferred Income	5,352	5,372
Financing Receivable, Originated in Current Fiscal Year	1,028	2,344
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	2,121	1,201
Financing Receivable, Originated Two Years before Latest Fiscal Year	772	870
Financing Receivable, Originated Three Years before Latest Fiscal Year	670	264
Financing Receivable, Originated Four Years before Latest Fiscal Year	219	160
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	277	218
Financing Receivable, Revolving	265	315
Other Commercial Real Estate Non owner Occupied [Member] \| Special Mention [Member]
Financing Receivable, Nonaccrual [Line Items]
Loans and Leases Receivable, Net of Deferred Income	306	54
Financing Receivable, Originated in Current Fiscal Year	16	3
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	150	38
Financing Receivable, Originated Two Years before Latest Fiscal Year	72	0
Financing Receivable, Originated Three Years before Latest Fiscal Year	38	12
Financing Receivable, Originated Four Years before Latest Fiscal Year	29	0
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	0	0
Financing Receivable, Revolving	1	1
Other Commercial Real Estate Non owner Occupied [Member] \| Substandard [Member]
Financing Receivable, Nonaccrual [Line Items]
Loans and Leases Receivable, Net of Deferred Income	134	31
Financing Receivable, Originated in Current Fiscal Year	0	0
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	0	4
Financing Receivable, Originated Two Years before Latest Fiscal Year	96	0
Financing Receivable, Originated Three Years before Latest Fiscal Year	0	12
Financing Receivable, Originated Four Years before Latest Fiscal Year	14	10
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	4	5
Financing Receivable, Revolving	20	0
Residential Real Estate [Member]
Financing Receivable, Nonaccrual [Line Items]
Loans and Leases Receivable, Net of Deferred Income	13,502	13,996
Financing Receivable, Originated in Current Fiscal Year	177	4,047
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	3,705	8,483
Financing Receivable, Originated Two Years before Latest Fiscal Year	8,239	878
Financing Receivable, Originated Three Years before Latest Fiscal Year	850	311
Financing Receivable, Originated Four Years before Latest Fiscal Year	287	151
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	217	90
Financing Receivable, Revolving	27	36
Residential Real Estate [Member] \| Pass [Member]
Financing Receivable, Nonaccrual [Line Items]
Loans and Leases Receivable, Net of Deferred Income	13,444	13,977
Financing Receivable, Originated in Current Fiscal Year	177	4,041
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	3,687	8,474
Financing Receivable, Originated Two Years before Latest Fiscal Year	8,207	878
Financing Receivable, Originated Three Years before Latest Fiscal Year	847	308
Financing Receivable, Originated Four Years before Latest Fiscal Year	284	150
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	215	90
Financing Receivable, Revolving	27	36
Residential Real Estate [Member] \| Special Mention [Member]
Financing Receivable, Nonaccrual [Line Items]
Loans and Leases Receivable, Net of Deferred Income	0	0
Financing Receivable, Originated in Current Fiscal Year	0	0
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	0	0
Financing Receivable, Originated Two Years before Latest Fiscal Year	0	0
Financing Receivable, Originated Three Years before Latest Fiscal Year	0	0
Financing Receivable, Originated Four Years before Latest Fiscal Year	0	0
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	0	0
Financing Receivable, Revolving	0	0
Residential Real Estate [Member] \| Substandard [Member]
Financing Receivable, Nonaccrual [Line Items]
Loans and Leases Receivable, Net of Deferred Income	58	19
Financing Receivable, Originated in Current Fiscal Year	0	6
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	18	9
Financing Receivable, Originated Two Years before Latest Fiscal Year	32	0
Financing Receivable, Originated Three Years before Latest Fiscal Year	3	3
Financing Receivable, Originated Four Years before Latest Fiscal Year	3	1
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	2	0
Financing Receivable, Revolving	0	0
Residential - EBO
Financing Receivable, Nonaccrual [Line Items]
Loans and Leases Receivable, Net of Deferred Income	1,432	1,884
Financing Receivable, Originated in Current Fiscal Year	0	3
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	9	268
Financing Receivable, Originated Two Years before Latest Fiscal Year	248	712
Financing Receivable, Originated Three Years before Latest Fiscal Year	591	454
Financing Receivable, Originated Four Years before Latest Fiscal Year	291	191
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	293	256
Financing Receivable, Revolving	0	0
Residential - EBO \| Pass [Member]
Financing Receivable, Nonaccrual [Line Items]
Loans and Leases Receivable, Net of Deferred Income	1,432	1,884
Financing Receivable, Originated in Current Fiscal Year	0	3
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	9	268
Financing Receivable, Originated Two Years before Latest Fiscal Year	248	712
Financing Receivable, Originated Three Years before Latest Fiscal Year	591	454
Financing Receivable, Originated Four Years before Latest Fiscal Year	291	191
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	293	256
Financing Receivable, Revolving	0	0
Residential - EBO \| Special Mention [Member]
Financing Receivable, Nonaccrual [Line Items]
Loans and Leases Receivable, Net of Deferred Income	0	0
Financing Receivable, Originated in Current Fiscal Year	0	0
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	0	0
Financing Receivable, Originated Two Years before Latest Fiscal Year	0	0
Financing Receivable, Originated Three Years before Latest Fiscal Year	0	0
Financing Receivable, Originated Four Years before Latest Fiscal Year	0	0
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	0	0
Financing Receivable, Revolving	0	0
Residential - EBO \| Substandard [Member]
Financing Receivable, Nonaccrual [Line Items]
Loans and Leases Receivable, Net of Deferred Income	0	0
Financing Receivable, Originated in Current Fiscal Year	0	0
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	0	0
Financing Receivable, Originated Two Years before Latest Fiscal Year	0	0
Financing Receivable, Originated Three Years before Latest Fiscal Year	0	0
Financing Receivable, Originated Four Years before Latest Fiscal Year	0	0
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	0	0
Financing Receivable, Revolving	0	0
Construction And Land Development Land [Member]
Financing Receivable, Nonaccrual [Line Items]
Loans and Leases Receivable, Net of Deferred Income	4,403	3,995
Financing Receivable, Originated in Current Fiscal Year	736	1,533
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	1,859	815
Financing Receivable, Originated Two Years before Latest Fiscal Year	530	371
Financing Receivable, Originated Three Years before Latest Fiscal Year	250	18
Financing Receivable, Originated Four Years before Latest Fiscal Year	0	0
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	2	0
Financing Receivable, Revolving	1,026	1,258
Construction And Land Development Land [Member] \| Pass [Member]
Financing Receivable, Nonaccrual [Line Items]
Loans and Leases Receivable, Net of Deferred Income	4,258	3,893
Financing Receivable, Originated in Current Fiscal Year	736	1,533
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	1,859	815
Financing Receivable, Originated Two Years before Latest Fiscal Year	497	273
Financing Receivable, Originated Three Years before Latest Fiscal Year	138	14
Financing Receivable, Originated Four Years before Latest Fiscal Year	0	0
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	2	0
Financing Receivable, Revolving	1,026	1,258
Construction And Land Development Land [Member] \| Special Mention [Member]
Financing Receivable, Nonaccrual [Line Items]
Loans and Leases Receivable, Net of Deferred Income	117	98
Financing Receivable, Originated in Current Fiscal Year	0	0
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	0	0
Financing Receivable, Originated Two Years before Latest Fiscal Year	5	98
Financing Receivable, Originated Three Years before Latest Fiscal Year	112	0
Financing Receivable, Originated Four Years before Latest Fiscal Year	0	0
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	0	0
Financing Receivable, Revolving	0	0
Construction And Land Development Land [Member] \| Substandard [Member]
Financing Receivable, Nonaccrual [Line Items]
Loans and Leases Receivable, Net of Deferred Income	28	4
Financing Receivable, Originated in Current Fiscal Year	0	0
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	0	0
Financing Receivable, Originated Two Years before Latest Fiscal Year	28	0
Financing Receivable, Originated Three Years before Latest Fiscal Year	0	4
Financing Receivable, Originated Four Years before Latest Fiscal Year	0	0
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	0	0
Financing Receivable, Revolving	0	0
Construction And Land Development [Member]
Financing Receivable, Nonaccrual [Line Items]
Loans and Leases Receivable, Net of Deferred Income	4,403	3,995
Other, loan segment
Financing Receivable, Nonaccrual [Line Items]
Loans and Leases Receivable, Net of Deferred Income	162	179
Financing Receivable, Originated in Current Fiscal Year	2	23
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	14	10
Financing Receivable, Originated Two Years before Latest Fiscal Year	5	13
Financing Receivable, Originated Three Years before Latest Fiscal Year	0	5
Financing Receivable, Originated Four Years before Latest Fiscal Year	4	2
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	66	62
Financing Receivable, Revolving	71	64
Other, loan segment \| Pass [Member]
Financing Receivable, Nonaccrual [Line Items]
Loans and Leases Receivable, Net of Deferred Income	162	178
Financing Receivable, Originated in Current Fiscal Year	2	23
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	14	10
Financing Receivable, Originated Two Years before Latest Fiscal Year	5	13
Financing Receivable, Originated Three Years before Latest Fiscal Year	0	5
Financing Receivable, Originated Four Years before Latest Fiscal Year	4	2
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	66	61
Financing Receivable, Revolving	71	64
Other, loan segment \| Special Mention [Member]
Financing Receivable, Nonaccrual [Line Items]
Loans and Leases Receivable, Net of Deferred Income	0	1
Financing Receivable, Originated in Current Fiscal Year	0	0
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	0	0
Financing Receivable, Originated Two Years before Latest Fiscal Year	0	0
Financing Receivable, Originated Three Years before Latest Fiscal Year	0	0
Financing Receivable, Originated Four Years before Latest Fiscal Year	0	0
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	0	1
Financing Receivable, Revolving	0	0
Other, loan segment \| Substandard [Member]
Financing Receivable, Nonaccrual [Line Items]
Loans and Leases Receivable, Net of Deferred Income	0	0
Financing Receivable, Originated in Current Fiscal Year	0	0
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	0	0
Financing Receivable, Originated Two Years before Latest Fiscal Year	0	0
Financing Receivable, Originated Three Years before Latest Fiscal Year	0	0
Financing Receivable, Originated Four Years before Latest Fiscal Year	0	0
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	0	0
Financing Receivable, Revolving	0	0
Financial Asset, 30 to 59 Days Past Due [Member]
Financing Receivable, Nonaccrual [Line Items]
Financing Receivable, before Allowance for Credit Loss	274	283
Financial Asset, 30 to 59 Days Past Due [Member] \| Warehouse lending [Member]
Financing Receivable, Nonaccrual [Line Items]
Financing Receivable, before Allowance for Credit Loss	0	0
Financial Asset, 30 to 59 Days Past Due [Member] \| Municipal and nonprofit [Member]
Financing Receivable, Nonaccrual [Line Items]
Financing Receivable, before Allowance for Credit Loss	0	0
Financial Asset, 30 to 59 Days Past Due [Member] \| Tech & Innovation [Member]
Financing Receivable, Nonaccrual [Line Items]
Financing Receivable, before Allowance for Credit Loss	0	23
Financial Asset, 30 to 59 Days Past Due [Member] \| Equity fund resources
Financing Receivable, Nonaccrual [Line Items]
Financing Receivable, before Allowance for Credit Loss	0	0
Financial Asset, 30 to 59 Days Past Due [Member] \| Other commercial and industrial [Member]
Financing Receivable, Nonaccrual [Line Items]
Financing Receivable, before Allowance for Credit Loss	0	2
Financial Asset, 30 to 59 Days Past Due [Member] \| Commercial Real Estate Owner Occupied [Member]
Financing Receivable, Nonaccrual [Line Items]
Financing Receivable, before Allowance for Credit Loss	0	0
Financial Asset, 30 to 59 Days Past Due [Member] \| Hotel franchise finance [Member]
Financing Receivable, Nonaccrual [Line Items]
Financing Receivable, before Allowance for Credit Loss	0	0
Financial Asset, 30 to 59 Days Past Due [Member] \| Other Commercial Real Estate Non owner Occupied [Member]
Financing Receivable, Nonaccrual [Line Items]
Financing Receivable, before Allowance for Credit Loss	0	3
Financial Asset, 30 to 59 Days Past Due [Member] \| Residential Real Estate [Member]
Financing Receivable, Nonaccrual [Line Items]
Financing Receivable, before Allowance for Credit Loss	94	37
Financial Asset, 30 to 59 Days Past Due [Member] \| Residential - EBO
Financing Receivable, Nonaccrual [Line Items]
Financing Receivable, before Allowance for Credit Loss	173	217
Financial Asset, 30 to 59 Days Past Due [Member] \| Construction And Land Development [Member]
Financing Receivable, Nonaccrual [Line Items]
Financing Receivable, before Allowance for Credit Loss	7	0
Financial Asset, 30 to 59 Days Past Due [Member] \| Other, loan segment
Financing Receivable, Nonaccrual [Line Items]
Financing Receivable, before Allowance for Credit Loss	0	1
Financial Asset, 60 to 89 Days Past Due [Member]
Financing Receivable, Nonaccrual [Line Items]
Financing Receivable, before Allowance for Credit Loss	136	120
Financial Asset, 60 to 89 Days Past Due [Member] \| Warehouse lending [Member]
Financing Receivable, Nonaccrual [Line Items]
Financing Receivable, before Allowance for Credit Loss	0	0
Financial Asset, 60 to 89 Days Past Due [Member] \| Municipal and nonprofit [Member]
Financing Receivable, Nonaccrual [Line Items]
Financing Receivable, before Allowance for Credit Loss	0	0
Financial Asset, 60 to 89 Days Past Due [Member] \| Tech & Innovation [Member]
Financing Receivable, Nonaccrual [Line Items]
Financing Receivable, before Allowance for Credit Loss	0	0
Financial Asset, 60 to 89 Days Past Due [Member] \| Equity fund resources
Financing Receivable, Nonaccrual [Line Items]
Financing Receivable, before Allowance for Credit Loss	0	0
Financial Asset, 60 to 89 Days Past Due [Member] \| Other commercial and industrial [Member]
Financing Receivable, Nonaccrual [Line Items]
Financing Receivable, before Allowance for Credit Loss	0	0
Financial Asset, 60 to 89 Days Past Due [Member] \| Commercial Real Estate Owner Occupied [Member]
Financing Receivable, Nonaccrual [Line Items]
Financing Receivable, before Allowance for Credit Loss	0	0
Financial Asset, 60 to 89 Days Past Due [Member] \| Hotel franchise finance [Member]
Financing Receivable, Nonaccrual [Line Items]
Financing Receivable, before Allowance for Credit Loss	0	0
Financial Asset, 60 to 89 Days Past Due [Member] \| Other Commercial Real Estate Non owner Occupied [Member]
Financing Receivable, Nonaccrual [Line Items]
Financing Receivable, before Allowance for Credit Loss	0	0
Financial Asset, 60 to 89 Days Past Due [Member] \| Residential Real Estate [Member]
Financing Receivable, Nonaccrual [Line Items]
Financing Receivable, before Allowance for Credit Loss	20	4
Financial Asset, 60 to 89 Days Past Due [Member] \| Residential - EBO
Financing Receivable, Nonaccrual [Line Items]
Financing Receivable, before Allowance for Credit Loss	116	116
Financial Asset, 60 to 89 Days Past Due [Member] \| Construction And Land Development [Member]
Financing Receivable, Nonaccrual [Line Items]
Financing Receivable, before Allowance for Credit Loss	0	0
Financial Asset, 60 to 89 Days Past Due [Member] \| Other, loan segment
Financing Receivable, Nonaccrual [Line Items]
Financing Receivable, before Allowance for Credit Loss	0	0
Financial Asset, Equal to or Greater than 90 Days Past Due [Member]
Financing Receivable, Nonaccrual [Line Items]
Financing Receivable, 90 Days or More Past Due, Still Accruing	481	582
Financial Asset, Equal to or Greater than 90 Days Past Due [Member] \| Warehouse lending [Member]
Financing Receivable, Nonaccrual [Line Items]
Financing Receivable, 90 Days or More Past Due, Still Accruing	0	0
Financial Asset, Equal to or Greater than 90 Days Past Due [Member] \| Municipal and nonprofit [Member]
Financing Receivable, Nonaccrual [Line Items]
Financing Receivable, 90 Days or More Past Due, Still Accruing	0	0
Financial Asset, Equal to or Greater than 90 Days Past Due [Member] \| Tech & Innovation [Member]
Financing Receivable, Nonaccrual [Line Items]
Financing Receivable, 90 Days or More Past Due, Still Accruing	0	0
Financial Asset, Equal to or Greater than 90 Days Past Due [Member] \| Equity fund resources
Financing Receivable, Nonaccrual [Line Items]
Financing Receivable, 90 Days or More Past Due, Still Accruing	0	0
Financial Asset, Equal to or Greater than 90 Days Past Due [Member] \| Other commercial and industrial [Member]
Financing Receivable, Nonaccrual [Line Items]
Financing Receivable, 90 Days or More Past Due, Still Accruing	0	0
Financial Asset, Equal to or Greater than 90 Days Past Due [Member] \| Commercial Real Estate Owner Occupied [Member]
Financing Receivable, Nonaccrual [Line Items]
Financing Receivable, 90 Days or More Past Due, Still Accruing	0	0
Financial Asset, Equal to or Greater than 90 Days Past Due [Member] \| Hotel franchise finance [Member]
Financing Receivable, Nonaccrual [Line Items]
Financing Receivable, 90 Days or More Past Due, Still Accruing	0	0
Financial Asset, Equal to or Greater than 90 Days Past Due [Member] \| Other Commercial Real Estate Non owner Occupied [Member]
Financing Receivable, Nonaccrual [Line Items]
Financing Receivable, 90 Days or More Past Due, Still Accruing	0	0
Financial Asset, Equal to or Greater than 90 Days Past Due [Member] \| Residential Real Estate [Member]
Financing Receivable, Nonaccrual [Line Items]
Financing Receivable, 90 Days or More Past Due, Still Accruing	0	0
Financial Asset, Equal to or Greater than 90 Days Past Due [Member] \| Residential - EBO
Financing Receivable, Nonaccrual [Line Items]
Financing Receivable, 90 Days or More Past Due, Still Accruing	481	582
Financial Asset, Equal to or Greater than 90 Days Past Due [Member] \| Construction And Land Development [Member]
Financing Receivable, Nonaccrual [Line Items]
Financing Receivable, 90 Days or More Past Due, Still Accruing	0	0
Financial Asset, Equal to or Greater than 90 Days Past Due [Member] \| Other, loan segment
Financing Receivable, Nonaccrual [Line Items]
Financing Receivable, 90 Days or More Past Due, Still Accruing	0	0
Financial Asset, Not Past Due
Financing Receivable, Nonaccrual [Line Items]
Financing Receivable, before Allowance for Credit Loss	46,984	50,877
Financial Asset, Not Past Due \| Warehouse lending [Member]
Financing Receivable, Nonaccrual [Line Items]
Financing Receivable, before Allowance for Credit Loss	5,549	5,561
Financial Asset, Not Past Due \| Municipal and nonprofit [Member]
Financing Receivable, Nonaccrual [Line Items]
Financing Receivable, before Allowance for Credit Loss	1,558	1,524
Financial Asset, Not Past Due \| Tech & Innovation [Member]
Financing Receivable, Nonaccrual [Line Items]
Financing Receivable, before Allowance for Credit Loss	2,401	2,270
Financial Asset, Not Past Due \| Equity fund resources
Financing Receivable, Nonaccrual [Line Items]
Financing Receivable, before Allowance for Credit Loss	931	3,717
Financial Asset, Not Past Due \| Other commercial and industrial [Member]
Financing Receivable, Nonaccrual [Line Items]
Financing Receivable, before Allowance for Credit Loss	6,396	7,791
Financial Asset, Not Past Due \| Commercial Real Estate Owner Occupied [Member]
Financing Receivable, Nonaccrual [Line Items]
Financing Receivable, before Allowance for Credit Loss	1,648	1,656
Financial Asset, Not Past Due \| Hotel franchise finance [Member]
Financing Receivable, Nonaccrual [Line Items]
Financing Receivable, before Allowance for Credit Loss	4,101	3,807
Financial Asset, Not Past Due \| Other Commercial Real Estate Non owner Occupied [Member]
Financing Receivable, Nonaccrual [Line Items]
Financing Receivable, before Allowance for Credit Loss	5,792	5,454
Financial Asset, Not Past Due \| Residential Real Estate [Member]
Financing Receivable, Nonaccrual [Line Items]
Financing Receivable, before Allowance for Credit Loss	13,388	13,955
Financial Asset, Not Past Due \| Residential - EBO
Financing Receivable, Nonaccrual [Line Items]
Financing Receivable, before Allowance for Credit Loss	662	969
Financial Asset, Not Past Due \| Construction And Land Development [Member]
Financing Receivable, Nonaccrual [Line Items]
Financing Receivable, before Allowance for Credit Loss	4,396	3,995
Financial Asset, Not Past Due \| Other, loan segment
Financing Receivable, Nonaccrual [Line Items]
Financing Receivable, before Allowance for Credit Loss	162	178
Financial Asset, Past Due
Financing Receivable, Nonaccrual [Line Items]
Financing Receivable, before Allowance for Credit Loss	891	985
Financial Asset, Past Due \| Warehouse lending [Member]
Financing Receivable, Nonaccrual [Line Items]
Financing Receivable, before Allowance for Credit Loss	0	0
Financial Asset, Past Due \| Municipal and nonprofit [Member]
Financing Receivable, Nonaccrual [Line Items]
Financing Receivable, before Allowance for Credit Loss	0	0
Financial Asset, Past Due \| Tech & Innovation [Member]
Financing Receivable, Nonaccrual [Line Items]
Financing Receivable, before Allowance for Credit Loss	0	23
Financial Asset, Past Due \| Equity fund resources
Financing Receivable, Nonaccrual [Line Items]
Financing Receivable, before Allowance for Credit Loss	0	0
Financial Asset, Past Due \| Other commercial and industrial [Member]
Financing Receivable, Nonaccrual [Line Items]
Financing Receivable, before Allowance for Credit Loss	0	2
Financial Asset, Past Due \| Commercial Real Estate Owner Occupied [Member]
Financing Receivable, Nonaccrual [Line Items]
Financing Receivable, before Allowance for Credit Loss	0	0
Financial Asset, Past Due \| Hotel franchise finance [Member]
Financing Receivable, Nonaccrual [Line Items]
Financing Receivable, before Allowance for Credit Loss	0	0
Financial Asset, Past Due \| Other Commercial Real Estate Non owner Occupied [Member]
Financing Receivable, Nonaccrual [Line Items]
Financing Receivable, before Allowance for Credit Loss	0	3
Financial Asset, Past Due \| Residential Real Estate [Member]
Financing Receivable, Nonaccrual [Line Items]
Financing Receivable, before Allowance for Credit Loss	114	41
Financial Asset, Past Due \| Residential - EBO
Financing Receivable, Nonaccrual [Line Items]
Financing Receivable, before Allowance for Credit Loss	770	915
Financial Asset, Past Due \| Construction And Land Development [Member]
Financing Receivable, Nonaccrual [Line Items]
Financing Receivable, before Allowance for Credit Loss	7	0
Financial Asset, Past Due \| Other, loan segment
Financing Receivable, Nonaccrual [Line Items]
Financing Receivable, before Allowance for Credit Loss	$ 0	$ 1

Loans, Leases and Allowance for Credit Losses - Loans by Risk Rating (Detail) - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2023	Dec. 31, 2022
Financing Receivable, Allowance for Credit Loss [Line Items]
Financing Receivable, Originated in Current Fiscal Year	$ 4,239.0	$ 15,460.0
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	13,131.0	15,098.0
Financing Receivable, Originated Two Years before Latest Fiscal Year	12,461.0	3,997.0
Financing Receivable, Originated Three Years before Latest Fiscal Year	3,457.0	2,319.0
Financing Receivable, Originated Four Years before Latest Fiscal Year	1,863.0	1,427.0
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	2,908.0	2,216.0
Financing Receivable, Revolving	9,816.0	11,345.0
Loans and Leases Receivable, Net of Deferred Income	47,875.0	51,862.0
Financing Receivable, Allowance for Credit Loss, Writeoff	17.0
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year, Writeoff	3.0
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year, Writeoff	4.0
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year, Writeoff	8.0
Financing Receivable, Year One, Originated, Current Fiscal Year, Writeoff	2.0
Pass [Member]
Financing Receivable, Allowance for Credit Loss [Line Items]
Financing Receivable, Originated in Current Fiscal Year	4,154.0	15,349.0
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	12,836.0	14,914.0
Financing Receivable, Originated Two Years before Latest Fiscal Year	12,094.0	3,853.0
Financing Receivable, Originated Three Years before Latest Fiscal Year	3,263.0	2,167.0
Financing Receivable, Originated Four Years before Latest Fiscal Year	1,653.0	1,363.0
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	2,830.0	2,191.0
Financing Receivable, Revolving	9,771.0	11,308.0
Loans and Leases Receivable, Net of Deferred Income	46,601.0	51,145.0
Special Mention [Member]
Financing Receivable, Allowance for Credit Loss [Line Items]
Financing Receivable, Originated in Current Fiscal Year	49.0	82.0
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	236.0	104.0
Financing Receivable, Originated Two Years before Latest Fiscal Year	132.0	127.0
Financing Receivable, Originated Three Years before Latest Fiscal Year	156.0	12.0
Financing Receivable, Originated Four Years before Latest Fiscal Year	70.0	0.0
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	33.0	2.0
Financing Receivable, Revolving	18.0	24.0
Loans and Leases Receivable, Net of Deferred Income	694.0	351.0
Substandard [Member]
Financing Receivable, Allowance for Credit Loss [Line Items]
Financing Receivable, Originated in Current Fiscal Year	36.0	29.0
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	59.0	80.0
Financing Receivable, Originated Two Years before Latest Fiscal Year	235.0	17.0
Financing Receivable, Originated Three Years before Latest Fiscal Year	38.0	140.0
Financing Receivable, Originated Four Years before Latest Fiscal Year	140.0	64.0
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	45.0	23.0
Financing Receivable, Revolving	27.0	13.0
Loans and Leases Receivable, Net of Deferred Income	580.0	366.0
Warehouse lending [Member]
Financing Receivable, Allowance for Credit Loss [Line Items]
Financing Receivable, Originated in Current Fiscal Year	387.0	440.0
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	248.0	41.0
Financing Receivable, Originated Two Years before Latest Fiscal Year	320.0	152.0
Financing Receivable, Originated Three Years before Latest Fiscal Year	293.0	0.0
Financing Receivable, Originated Four Years before Latest Fiscal Year	0.0	0.0
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	0.0	0.0
Financing Receivable, Revolving	4,301.0	4,928.0
Loans and Leases Receivable, Net of Deferred Income	5,549.0	5,561.0
Warehouse lending [Member] \| Pass [Member]
Financing Receivable, Allowance for Credit Loss [Line Items]
Financing Receivable, Originated in Current Fiscal Year	387.0	397.0
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	248.0	41.0
Financing Receivable, Originated Two Years before Latest Fiscal Year	320.0	152.0
Financing Receivable, Originated Three Years before Latest Fiscal Year	293.0	0.0
Financing Receivable, Originated Four Years before Latest Fiscal Year	0.0	0.0
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	0.0	0.0
Financing Receivable, Revolving	4,301.0	4,928.0
Loans and Leases Receivable, Net of Deferred Income	5,549.0	5,518.0
Warehouse lending [Member] \| Special Mention [Member]
Financing Receivable, Allowance for Credit Loss [Line Items]
Financing Receivable, Originated in Current Fiscal Year	0.0	43.0
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	0.0	0.0
Financing Receivable, Originated Two Years before Latest Fiscal Year	0.0	0.0
Financing Receivable, Originated Three Years before Latest Fiscal Year	0.0	0.0
Financing Receivable, Originated Four Years before Latest Fiscal Year	0.0	0.0
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	0.0	0.0
Financing Receivable, Revolving	0.0	0.0
Loans and Leases Receivable, Net of Deferred Income	0.0	43.0
Warehouse lending [Member] \| Substandard [Member]
Financing Receivable, Allowance for Credit Loss [Line Items]
Financing Receivable, Originated in Current Fiscal Year	0.0	0.0
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	0.0	0.0
Financing Receivable, Originated Two Years before Latest Fiscal Year	0.0	0.0
Financing Receivable, Originated Three Years before Latest Fiscal Year	0.0	0.0
Financing Receivable, Originated Four Years before Latest Fiscal Year	0.0	0.0
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	0.0	0.0
Financing Receivable, Revolving	0.0	0.0
Loans and Leases Receivable, Net of Deferred Income	0.0	0.0
Municipal and nonprofit [Member]
Financing Receivable, Allowance for Credit Loss [Line Items]
Financing Receivable, Originated in Current Fiscal Year	25.0	107.0
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	138.0	185.0
Financing Receivable, Originated Two Years before Latest Fiscal Year	187.0	187.0
Financing Receivable, Originated Three Years before Latest Fiscal Year	186.0	78.0
Financing Receivable, Originated Four Years before Latest Fiscal Year	77.0	43.0
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	945.0	924.0
Financing Receivable, Revolving	0.0	0.0
Loans and Leases Receivable, Net of Deferred Income	1,558.0	1,524.0
Municipal and nonprofit [Member] \| Pass [Member]
Financing Receivable, Allowance for Credit Loss [Line Items]
Financing Receivable, Originated in Current Fiscal Year	25.0	107.0
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	131.0	185.0
Financing Receivable, Originated Two Years before Latest Fiscal Year	187.0	187.0
Financing Receivable, Originated Three Years before Latest Fiscal Year	186.0	78.0
Financing Receivable, Originated Four Years before Latest Fiscal Year	71.0	43.0
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	927.0	917.0
Financing Receivable, Revolving	0.0	0.0
Loans and Leases Receivable, Net of Deferred Income	1,527.0	1,517.0
Municipal and nonprofit [Member] \| Special Mention [Member]
Financing Receivable, Allowance for Credit Loss [Line Items]
Financing Receivable, Originated in Current Fiscal Year	0.0	0.0
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	7.0	0.0
Financing Receivable, Originated Two Years before Latest Fiscal Year	0.0	0.0
Financing Receivable, Originated Three Years before Latest Fiscal Year	0.0	0.0
Financing Receivable, Originated Four Years before Latest Fiscal Year	0.0	0.0
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	11.0	0.0
Financing Receivable, Revolving	0.0	0.0
Loans and Leases Receivable, Net of Deferred Income	18.0	0.0
Municipal and nonprofit [Member] \| Substandard [Member]
Financing Receivable, Allowance for Credit Loss [Line Items]
Financing Receivable, Originated in Current Fiscal Year	0.0	0.0
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	0.0	0.0
Financing Receivable, Originated Two Years before Latest Fiscal Year	0.0	0.0
Financing Receivable, Originated Three Years before Latest Fiscal Year	0.0	0.0
Financing Receivable, Originated Four Years before Latest Fiscal Year	6.0	0.0
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	7.0	7.0
Financing Receivable, Revolving	0.0	0.0
Loans and Leases Receivable, Net of Deferred Income	13.0	7.0
Tech & Innovation [Member]
Financing Receivable, Allowance for Credit Loss [Line Items]
Financing Receivable, Originated in Current Fiscal Year	244.0	851.0
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	811.0	408.0
Financing Receivable, Originated Two Years before Latest Fiscal Year	281.0	90.0
Financing Receivable, Originated Three Years before Latest Fiscal Year	86.0	66.0
Financing Receivable, Originated Four Years before Latest Fiscal Year	53.0	4.0
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	1.0	1.0
Financing Receivable, Revolving	925.0	873.0
Loans and Leases Receivable, Net of Deferred Income	2,401.0	2,293.0
Financing Receivable, Allowance for Credit Loss, Writeoff	2.0
Financing Receivable, Year One, Originated, Current Fiscal Year, Writeoff	2.0
Tech & Innovation [Member] \| Pass [Member]
Financing Receivable, Allowance for Credit Loss [Line Items]
Financing Receivable, Originated in Current Fiscal Year	226.0	813.0
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	774.0	374.0
Financing Receivable, Originated Two Years before Latest Fiscal Year	275.0	87.0
Financing Receivable, Originated Three Years before Latest Fiscal Year	77.0	66.0
Financing Receivable, Originated Four Years before Latest Fiscal Year	53.0	4.0
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	1.0	1.0
Financing Receivable, Revolving	908.0	853.0
Loans and Leases Receivable, Net of Deferred Income	2,314.0	2,198.0
Tech & Innovation [Member] \| Special Mention [Member]
Financing Receivable, Allowance for Credit Loss [Line Items]
Financing Receivable, Originated in Current Fiscal Year	12.0	36.0
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	32.0	22.0
Financing Receivable, Originated Two Years before Latest Fiscal Year	0.0	3.0
Financing Receivable, Originated Three Years before Latest Fiscal Year	6.0	0.0
Financing Receivable, Originated Four Years before Latest Fiscal Year	0.0	0.0
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	0.0	0.0
Financing Receivable, Revolving	17.0	20.0
Loans and Leases Receivable, Net of Deferred Income	67.0	81.0
Tech & Innovation [Member] \| Substandard [Member]
Financing Receivable, Allowance for Credit Loss [Line Items]
Financing Receivable, Originated in Current Fiscal Year	6.0	2.0
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	5.0	12.0
Financing Receivable, Originated Two Years before Latest Fiscal Year	6.0	0.0
Financing Receivable, Originated Three Years before Latest Fiscal Year	3.0	0.0
Financing Receivable, Originated Four Years before Latest Fiscal Year	0.0	0.0
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	0.0	0.0
Financing Receivable, Revolving	0.0	0.0
Loans and Leases Receivable, Net of Deferred Income	20.0	14.0
Equity fund resources
Financing Receivable, Allowance for Credit Loss [Line Items]
Financing Receivable, Originated in Current Fiscal Year	116.0	1,020.0
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	89.0	1,189.0
Financing Receivable, Originated Two Years before Latest Fiscal Year	48.0	191.0
Financing Receivable, Originated Three Years before Latest Fiscal Year	3.0	16.0
Financing Receivable, Originated Four Years before Latest Fiscal Year	12.0	0.0
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	4.0	0.0
Financing Receivable, Revolving	659.0	1,301.0
Loans and Leases Receivable, Net of Deferred Income	931.0	3,717.0
Equity fund resources \| Pass [Member]
Financing Receivable, Allowance for Credit Loss [Line Items]
Financing Receivable, Originated in Current Fiscal Year	116.0	1,020.0
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	89.0	1,189.0
Financing Receivable, Originated Two Years before Latest Fiscal Year	48.0	191.0
Financing Receivable, Originated Three Years before Latest Fiscal Year	3.0	16.0
Financing Receivable, Originated Four Years before Latest Fiscal Year	12.0	0.0
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	4.0	0.0
Financing Receivable, Revolving	659.0	1,301.0
Loans and Leases Receivable, Net of Deferred Income	931.0	3,717.0
Equity fund resources \| Special Mention [Member]
Financing Receivable, Allowance for Credit Loss [Line Items]
Financing Receivable, Originated in Current Fiscal Year	0.0	0.0
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	0.0	0.0
Financing Receivable, Originated Two Years before Latest Fiscal Year	0.0	0.0
Financing Receivable, Originated Three Years before Latest Fiscal Year	0.0	0.0
Financing Receivable, Originated Four Years before Latest Fiscal Year	0.0	0.0
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	0.0	0.0
Financing Receivable, Revolving	0.0	0.0
Loans and Leases Receivable, Net of Deferred Income	0.0	0.0
Equity fund resources \| Substandard [Member]
Financing Receivable, Allowance for Credit Loss [Line Items]
Financing Receivable, Originated in Current Fiscal Year	0.0	0.0
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	0.0	0.0
Financing Receivable, Originated Two Years before Latest Fiscal Year	0.0	0.0
Financing Receivable, Originated Three Years before Latest Fiscal Year	0.0	0.0
Financing Receivable, Originated Four Years before Latest Fiscal Year	0.0	0.0
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	0.0	0.0
Financing Receivable, Revolving	0.0	0.0
Loans and Leases Receivable, Net of Deferred Income	0.0	0.0
Other commercial and industrial [Member]
Financing Receivable, Allowance for Credit Loss [Line Items]
Financing Receivable, Originated in Current Fiscal Year	980.0	2,971.0
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	1,878.0	1,337.0
Financing Receivable, Originated Two Years before Latest Fiscal Year	575.0	272.0
Financing Receivable, Originated Three Years before Latest Fiscal Year	197.0	280.0
Financing Receivable, Originated Four Years before Latest Fiscal Year	113.0	315.0
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	285.0	207.0
Financing Receivable, Revolving	2,368.0	2,411.0
Loans and Leases Receivable, Net of Deferred Income	6,396.0	7,793.0
Financing Receivable, Allowance for Credit Loss, Writeoff	13.0
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year, Writeoff	3.0
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year, Writeoff	4.0
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year, Writeoff	6.0
Other commercial and industrial [Member] \| Pass [Member]
Financing Receivable, Allowance for Credit Loss [Line Items]
Financing Receivable, Originated in Current Fiscal Year	961.0	2,968.0
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	1,804.0	1,272.0
Financing Receivable, Originated Two Years before Latest Fiscal Year	513.0	262.0
Financing Receivable, Originated Three Years before Latest Fiscal Year	194.0	277.0
Financing Receivable, Originated Four Years before Latest Fiscal Year	112.0	312.0
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	284.0	206.0
Financing Receivable, Revolving	2,361.0	2,406.0
Loans and Leases Receivable, Net of Deferred Income	6,229.0	7,703.0
Other commercial and industrial [Member] \| Special Mention [Member]
Financing Receivable, Allowance for Credit Loss [Line Items]
Financing Receivable, Originated in Current Fiscal Year	19.0	0.0
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	47.0	44.0
Financing Receivable, Originated Two Years before Latest Fiscal Year	15.0	0.0
Financing Receivable, Originated Three Years before Latest Fiscal Year	0.0	0.0
Financing Receivable, Originated Four Years before Latest Fiscal Year	0.0	0.0
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	0.0	0.0
Financing Receivable, Revolving	0.0	3.0
Loans and Leases Receivable, Net of Deferred Income	81.0	47.0
Other commercial and industrial [Member] \| Substandard [Member]
Financing Receivable, Allowance for Credit Loss [Line Items]
Financing Receivable, Originated in Current Fiscal Year	0.0	3.0
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	27.0	21.0
Financing Receivable, Originated Two Years before Latest Fiscal Year	47.0	10.0
Financing Receivable, Originated Three Years before Latest Fiscal Year	3.0	3.0
Financing Receivable, Originated Four Years before Latest Fiscal Year	1.0	3.0
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	1.0	1.0
Financing Receivable, Revolving	7.0	2.0
Loans and Leases Receivable, Net of Deferred Income	86.0	43.0
Commercial Real Estate Owner Occupied [Member]
Financing Receivable, Allowance for Credit Loss [Line Items]
Financing Receivable, Originated in Current Fiscal Year	62.0	338.0
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	349.0	373.0
Financing Receivable, Originated Two Years before Latest Fiscal Year	365.0	181.0
Financing Receivable, Originated Three Years before Latest Fiscal Year	172.0	158.0
Financing Receivable, Originated Four Years before Latest Fiscal Year	147.0	216.0
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	518.0	350.0
Financing Receivable, Revolving	35.0	40.0
Loans and Leases Receivable, Net of Deferred Income	1,648.0	1,656.0
Commercial Real Estate Owner Occupied [Member] \| Pass [Member]
Financing Receivable, Allowance for Credit Loss [Line Items]
Financing Receivable, Originated in Current Fiscal Year	57.0	338.0
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	349.0	359.0
Financing Receivable, Originated Two Years before Latest Fiscal Year	359.0	174.0
Financing Receivable, Originated Three Years before Latest Fiscal Year	169.0	157.0
Financing Receivable, Originated Four Years before Latest Fiscal Year	142.0	211.0
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	510.0	339.0
Financing Receivable, Revolving	35.0	29.0
Loans and Leases Receivable, Net of Deferred Income	1,621.0	1,607.0
Commercial Real Estate Owner Occupied [Member] \| Special Mention [Member]
Financing Receivable, Allowance for Credit Loss [Line Items]
Financing Receivable, Originated in Current Fiscal Year	2.0	0.0
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	0.0	0.0
Financing Receivable, Originated Two Years before Latest Fiscal Year	0.0	0.0
Financing Receivable, Originated Three Years before Latest Fiscal Year	0.0	0.0
Financing Receivable, Originated Four Years before Latest Fiscal Year	1.0	0.0
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	1.0	1.0
Financing Receivable, Revolving	0.0	0.0
Loans and Leases Receivable, Net of Deferred Income	4.0	1.0
Commercial Real Estate Owner Occupied [Member] \| Substandard [Member]
Financing Receivable, Allowance for Credit Loss [Line Items]
Financing Receivable, Originated in Current Fiscal Year	3.0	0.0
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	0.0	14.0
Financing Receivable, Originated Two Years before Latest Fiscal Year	6.0	7.0
Financing Receivable, Originated Three Years before Latest Fiscal Year	3.0	1.0
Financing Receivable, Originated Four Years before Latest Fiscal Year	4.0	5.0
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	7.0	10.0
Financing Receivable, Revolving	0.0	11.0
Loans and Leases Receivable, Net of Deferred Income	23.0	48.0
Hotel franchise finance [Member]
Financing Receivable, Allowance for Credit Loss [Line Items]
Financing Receivable, Originated in Current Fiscal Year	466.0	1,780.0
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	1,760.0	746.0
Financing Receivable, Originated Two Years before Latest Fiscal Year	723.0	80.0
Financing Receivable, Originated Three Years before Latest Fiscal Year	121.0	645.0
Financing Receivable, Originated Four Years before Latest Fiscal Year	617.0	335.0
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	296.0	103.0
Financing Receivable, Revolving	118.0	118.0
Loans and Leases Receivable, Net of Deferred Income	4,101.0	3,807.0
Hotel franchise finance [Member] \| Pass [Member]
Financing Receivable, Allowance for Credit Loss [Line Items]
Financing Receivable, Originated in Current Fiscal Year	439.0	1,762.0
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	1,751.0	726.0
Financing Receivable, Originated Two Years before Latest Fiscal Year	663.0	54.0
Financing Receivable, Originated Three Years before Latest Fiscal Year	95.0	528.0
Financing Receivable, Originated Four Years before Latest Fiscal Year	465.0	290.0
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	251.0	103.0
Financing Receivable, Revolving	118.0	118.0
Loans and Leases Receivable, Net of Deferred Income	3,782.0	3,581.0
Hotel franchise finance [Member] \| Special Mention [Member]
Financing Receivable, Allowance for Credit Loss [Line Items]
Financing Receivable, Originated in Current Fiscal Year	0.0	0.0
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	0.0	0.0
Financing Receivable, Originated Two Years before Latest Fiscal Year	40.0	26.0
Financing Receivable, Originated Three Years before Latest Fiscal Year	0.0	0.0
Financing Receivable, Originated Four Years before Latest Fiscal Year	40.0	0.0
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	21.0	0.0
Financing Receivable, Revolving	0.0	0.0
Loans and Leases Receivable, Net of Deferred Income	101.0	26.0
Hotel franchise finance [Member] \| Substandard [Member]
Financing Receivable, Allowance for Credit Loss [Line Items]
Financing Receivable, Originated in Current Fiscal Year	27.0	18.0
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	9.0	20.0
Financing Receivable, Originated Two Years before Latest Fiscal Year	20.0	0.0
Financing Receivable, Originated Three Years before Latest Fiscal Year	26.0	117.0
Financing Receivable, Originated Four Years before Latest Fiscal Year	112.0	45.0
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	24.0	0.0
Financing Receivable, Revolving	0.0	0.0
Loans and Leases Receivable, Net of Deferred Income	218.0	200.0
Other Commercial Real Estate Non owner Occupied [Member]
Financing Receivable, Allowance for Credit Loss [Line Items]
Financing Receivable, Originated in Current Fiscal Year	1,044.0	2,347.0
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	2,271.0	1,243.0
Financing Receivable, Originated Two Years before Latest Fiscal Year	940.0	870.0
Financing Receivable, Originated Three Years before Latest Fiscal Year	708.0	288.0
Financing Receivable, Originated Four Years before Latest Fiscal Year	262.0	170.0
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	281.0	223.0
Financing Receivable, Revolving	286.0	316.0
Loans and Leases Receivable, Net of Deferred Income	5,792.0	5,457.0
Financing Receivable, Allowance for Credit Loss, Writeoff	2.0
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year, Writeoff	2.0
Other Commercial Real Estate Non owner Occupied [Member] \| Pass [Member]
Financing Receivable, Allowance for Credit Loss [Line Items]
Financing Receivable, Originated in Current Fiscal Year	1,028.0	2,344.0
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	2,121.0	1,201.0
Financing Receivable, Originated Two Years before Latest Fiscal Year	772.0	870.0
Financing Receivable, Originated Three Years before Latest Fiscal Year	670.0	264.0
Financing Receivable, Originated Four Years before Latest Fiscal Year	219.0	160.0
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	277.0	218.0
Financing Receivable, Revolving	265.0	315.0
Loans and Leases Receivable, Net of Deferred Income	5,352.0	5,372.0
Other Commercial Real Estate Non owner Occupied [Member] \| Special Mention [Member]
Financing Receivable, Allowance for Credit Loss [Line Items]
Financing Receivable, Originated in Current Fiscal Year	16.0	3.0
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	150.0	38.0
Financing Receivable, Originated Two Years before Latest Fiscal Year	72.0	0.0
Financing Receivable, Originated Three Years before Latest Fiscal Year	38.0	12.0
Financing Receivable, Originated Four Years before Latest Fiscal Year	29.0	0.0
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	0.0	0.0
Financing Receivable, Revolving	1.0	1.0
Loans and Leases Receivable, Net of Deferred Income	306.0	54.0
Other Commercial Real Estate Non owner Occupied [Member] \| Substandard [Member]
Financing Receivable, Allowance for Credit Loss [Line Items]
Financing Receivable, Originated in Current Fiscal Year	0.0	0.0
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	0.0	4.0
Financing Receivable, Originated Two Years before Latest Fiscal Year	96.0	0.0
Financing Receivable, Originated Three Years before Latest Fiscal Year	0.0	12.0
Financing Receivable, Originated Four Years before Latest Fiscal Year	14.0	10.0
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	4.0	5.0
Financing Receivable, Revolving	20.0	0.0
Loans and Leases Receivable, Net of Deferred Income	134.0	31.0
Residential Real Estate [Member]
Financing Receivable, Allowance for Credit Loss [Line Items]
Financing Receivable, Originated in Current Fiscal Year	177.0	4,047.0
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	3,705.0	8,483.0
Financing Receivable, Originated Two Years before Latest Fiscal Year	8,239.0	878.0
Financing Receivable, Originated Three Years before Latest Fiscal Year	850.0	311.0
Financing Receivable, Originated Four Years before Latest Fiscal Year	287.0	151.0
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	217.0	90.0
Financing Receivable, Revolving	27.0	36.0
Loans and Leases Receivable, Net of Deferred Income	13,502.0	13,996.0
Residential Real Estate [Member] \| Pass [Member]
Financing Receivable, Allowance for Credit Loss [Line Items]
Financing Receivable, Originated in Current Fiscal Year	177.0	4,041.0
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	3,687.0	8,474.0
Financing Receivable, Originated Two Years before Latest Fiscal Year	8,207.0	878.0
Financing Receivable, Originated Three Years before Latest Fiscal Year	847.0	308.0
Financing Receivable, Originated Four Years before Latest Fiscal Year	284.0	150.0
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	215.0	90.0
Financing Receivable, Revolving	27.0	36.0
Loans and Leases Receivable, Net of Deferred Income	13,444.0	13,977.0
Residential Real Estate [Member] \| Special Mention [Member]
Financing Receivable, Allowance for Credit Loss [Line Items]
Financing Receivable, Originated in Current Fiscal Year	0.0	0.0
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	0.0	0.0
Financing Receivable, Originated Two Years before Latest Fiscal Year	0.0	0.0
Financing Receivable, Originated Three Years before Latest Fiscal Year	0.0	0.0
Financing Receivable, Originated Four Years before Latest Fiscal Year	0.0	0.0
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	0.0	0.0
Financing Receivable, Revolving	0.0	0.0
Loans and Leases Receivable, Net of Deferred Income	0.0	0.0
Residential Real Estate [Member] \| Substandard [Member]
Financing Receivable, Allowance for Credit Loss [Line Items]
Financing Receivable, Originated in Current Fiscal Year	0.0	6.0
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	18.0	9.0
Financing Receivable, Originated Two Years before Latest Fiscal Year	32.0	0.0
Financing Receivable, Originated Three Years before Latest Fiscal Year	3.0	3.0
Financing Receivable, Originated Four Years before Latest Fiscal Year	3.0	1.0
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	2.0	0.0
Financing Receivable, Revolving	0.0	0.0
Loans and Leases Receivable, Net of Deferred Income	58.0	19.0
Residential - EBO
Financing Receivable, Allowance for Credit Loss [Line Items]
Financing Receivable, Originated in Current Fiscal Year	0.0	3.0
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	9.0	268.0
Financing Receivable, Originated Two Years before Latest Fiscal Year	248.0	712.0
Financing Receivable, Originated Three Years before Latest Fiscal Year	591.0	454.0
Financing Receivable, Originated Four Years before Latest Fiscal Year	291.0	191.0
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	293.0	256.0
Financing Receivable, Revolving	0.0	0.0
Loans and Leases Receivable, Net of Deferred Income	1,432.0	1,884.0
Residential - EBO \| Pass [Member]
Financing Receivable, Allowance for Credit Loss [Line Items]
Financing Receivable, Originated in Current Fiscal Year	0.0	3.0
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	9.0	268.0
Financing Receivable, Originated Two Years before Latest Fiscal Year	248.0	712.0
Financing Receivable, Originated Three Years before Latest Fiscal Year	591.0	454.0
Financing Receivable, Originated Four Years before Latest Fiscal Year	291.0	191.0
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	293.0	256.0
Financing Receivable, Revolving	0.0	0.0
Loans and Leases Receivable, Net of Deferred Income	1,432.0	1,884.0
Residential - EBO \| Special Mention [Member]
Financing Receivable, Allowance for Credit Loss [Line Items]
Financing Receivable, Originated in Current Fiscal Year	0.0	0.0
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	0.0	0.0
Financing Receivable, Originated Two Years before Latest Fiscal Year	0.0	0.0
Financing Receivable, Originated Three Years before Latest Fiscal Year	0.0	0.0
Financing Receivable, Originated Four Years before Latest Fiscal Year	0.0	0.0
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	0.0	0.0
Financing Receivable, Revolving	0.0	0.0
Loans and Leases Receivable, Net of Deferred Income	0.0	0.0
Residential - EBO \| Substandard [Member]
Financing Receivable, Allowance for Credit Loss [Line Items]
Financing Receivable, Originated in Current Fiscal Year	0.0	0.0
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	0.0	0.0
Financing Receivable, Originated Two Years before Latest Fiscal Year	0.0	0.0
Financing Receivable, Originated Three Years before Latest Fiscal Year	0.0	0.0
Financing Receivable, Originated Four Years before Latest Fiscal Year	0.0	0.0
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	0.0	0.0
Financing Receivable, Revolving	0.0	0.0
Loans and Leases Receivable, Net of Deferred Income	0.0	0.0
Construction And Land Development Land [Member]
Financing Receivable, Allowance for Credit Loss [Line Items]
Financing Receivable, Originated in Current Fiscal Year	736.0	1,533.0
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	1,859.0	815.0
Financing Receivable, Originated Two Years before Latest Fiscal Year	530.0	371.0
Financing Receivable, Originated Three Years before Latest Fiscal Year	250.0	18.0
Financing Receivable, Originated Four Years before Latest Fiscal Year	0.0	0.0
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	2.0	0.0
Financing Receivable, Revolving	1,026.0	1,258.0
Loans and Leases Receivable, Net of Deferred Income	4,403.0	3,995.0
Construction And Land Development Land [Member] \| Pass [Member]
Financing Receivable, Allowance for Credit Loss [Line Items]
Financing Receivable, Originated in Current Fiscal Year	736.0	1,533.0
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	1,859.0	815.0
Financing Receivable, Originated Two Years before Latest Fiscal Year	497.0	273.0
Financing Receivable, Originated Three Years before Latest Fiscal Year	138.0	14.0
Financing Receivable, Originated Four Years before Latest Fiscal Year	0.0	0.0
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	2.0	0.0
Financing Receivable, Revolving	1,026.0	1,258.0
Loans and Leases Receivable, Net of Deferred Income	4,258.0	3,893.0
Construction And Land Development Land [Member] \| Special Mention [Member]
Financing Receivable, Allowance for Credit Loss [Line Items]
Financing Receivable, Originated in Current Fiscal Year	0.0	0.0
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	0.0	0.0
Financing Receivable, Originated Two Years before Latest Fiscal Year	5.0	98.0
Financing Receivable, Originated Three Years before Latest Fiscal Year	112.0	0.0
Financing Receivable, Originated Four Years before Latest Fiscal Year	0.0	0.0
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	0.0	0.0
Financing Receivable, Revolving	0.0	0.0
Loans and Leases Receivable, Net of Deferred Income	117.0	98.0
Construction And Land Development Land [Member] \| Substandard [Member]
Financing Receivable, Allowance for Credit Loss [Line Items]
Financing Receivable, Originated in Current Fiscal Year	0.0	0.0
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	0.0	0.0
Financing Receivable, Originated Two Years before Latest Fiscal Year	28.0	0.0
Financing Receivable, Originated Three Years before Latest Fiscal Year	0.0	4.0
Financing Receivable, Originated Four Years before Latest Fiscal Year	0.0	0.0
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	0.0	0.0
Financing Receivable, Revolving	0.0	0.0
Loans and Leases Receivable, Net of Deferred Income	28.0	4.0
Other, loan segment
Financing Receivable, Allowance for Credit Loss [Line Items]
Financing Receivable, Originated in Current Fiscal Year	2.0	23.0
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	14.0	10.0
Financing Receivable, Originated Two Years before Latest Fiscal Year	5.0	13.0
Financing Receivable, Originated Three Years before Latest Fiscal Year	0.0	5.0
Financing Receivable, Originated Four Years before Latest Fiscal Year	4.0	2.0
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	66.0	62.0
Financing Receivable, Revolving	71.0	64.0
Loans and Leases Receivable, Net of Deferred Income	162.0	179.0
Other, loan segment \| Pass [Member]
Financing Receivable, Allowance for Credit Loss [Line Items]
Financing Receivable, Originated in Current Fiscal Year	2.0	23.0
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	14.0	10.0
Financing Receivable, Originated Two Years before Latest Fiscal Year	5.0	13.0
Financing Receivable, Originated Three Years before Latest Fiscal Year	0.0	5.0
Financing Receivable, Originated Four Years before Latest Fiscal Year	4.0	2.0
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	66.0	61.0
Financing Receivable, Revolving	71.0	64.0
Loans and Leases Receivable, Net of Deferred Income	162.0	178.0
Other, loan segment \| Special Mention [Member]
Financing Receivable, Allowance for Credit Loss [Line Items]
Financing Receivable, Originated in Current Fiscal Year	0.0	0.0
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	0.0	0.0
Financing Receivable, Originated Two Years before Latest Fiscal Year	0.0	0.0
Financing Receivable, Originated Three Years before Latest Fiscal Year	0.0	0.0
Financing Receivable, Originated Four Years before Latest Fiscal Year	0.0	0.0
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	0.0	1.0
Financing Receivable, Revolving	0.0	0.0
Loans and Leases Receivable, Net of Deferred Income	0.0	1.0
Other, loan segment \| Substandard [Member]
Financing Receivable, Allowance for Credit Loss [Line Items]
Financing Receivable, Originated in Current Fiscal Year	0.0	0.0
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	0.0	0.0
Financing Receivable, Originated Two Years before Latest Fiscal Year	0.0	0.0
Financing Receivable, Originated Three Years before Latest Fiscal Year	0.0	0.0
Financing Receivable, Originated Four Years before Latest Fiscal Year	0.0	0.0
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	0.0	0.0
Financing Receivable, Revolving	0.0	0.0
Loans and Leases Receivable, Net of Deferred Income	$ 0.0	$ 0.0

Loans, Leases and Allowance for Credit Losses Loans, Leases and Allowance for Credit Losses - Troubled Debt Restructurings (Details)	3 Months Ended		6 Months Ended
	Jun. 30, 2023 USD ($)	Jun. 30, 2022 SecurityLoan	Jun. 30, 2023 USD ($)	Dec. 31, 2022 USD ($) SecurityLoan
Financing Receivable, Troubled Debt Restructuring [Line Items]
Financing Receivable, Troubled Debt Restructuring, Subsequent Default, Number of Contracts \| SecurityLoan		0
Financing Receivable, Troubled Debt Restructuring, Commitment to Lend				$ 0
Financing Receivable, Modifications, Number of Contracts \| SecurityLoan		1
Reserves allocated to customers whose loan terms modified in troubled debt restructurings				$ 4,000,000
Financing Receivable, Excluding Accrued Interest, Modified in Period, to Total Financing Receivables, Percentage	0.10%		0.20%
Financing Receivable, Excluding Accrued Interest, Modified in Period, Amount	$ 64,000,000		$ 90,000,000
Financing Receivable, Troubled Debt Restructured Loans, Number of Outstanding Contracts \| SecurityLoan				7
Financing Receivable, Troubled Debt Restructuring				$ 14,000,000
Financing Receivable, Modified, Nonaccrual	35,000,000		35,000,000
Financing Receivable, Modified, Accrual Status	55,000,000		55,000,000
Extended Maturity
Financing Receivable, Troubled Debt Restructuring [Line Items]
Financing Receivable, Excluding Accrued Interest, Modified in Period, Amount	$ 64,000,000		82,000,000
Payment Deferral
Financing Receivable, Troubled Debt Restructuring [Line Items]
Financing Receivable, Excluding Accrued Interest, Modified in Period, Amount			$ 6,000,000
Tech & Innovation [Member]
Financing Receivable, Troubled Debt Restructuring [Line Items]
Financing Receivable, Excluding Accrued Interest, Modified in Period, to Total Financing Receivables, Percentage			0.30%
Financing Receivable, Excluding Accrued Interest, Modified in Period, Amount			$ 7,000,000
Tech & Innovation [Member] \| Payment Deferral
Financing Receivable, Troubled Debt Restructuring [Line Items]
Financing Receivable, Excluding Accrued Interest, Modified in Period, Amount			$ 5,000,000
Other commercial and industrial [Member]
Financing Receivable, Troubled Debt Restructuring [Line Items]
Financing Receivable, Excluding Accrued Interest, Modified in Period, to Total Financing Receivables, Percentage	0.40%		0.40%
Financing Receivable, Excluding Accrued Interest, Modified in Period, Amount	$ 27,000,000		$ 27,000,000
Financing Receivable, Troubled Debt Restructured Loans, Number of Outstanding Contracts \| SecurityLoan				4
Financing Receivable, Troubled Debt Restructuring				$ 2,000,000
Other commercial and industrial [Member] \| Extended Maturity
Financing Receivable, Troubled Debt Restructuring [Line Items]
Financing Receivable, Excluding Accrued Interest, Modified in Period, Amount	$ 27,000,000		$ 27,000,000
Commercial Real Estate Owner Occupied [Member]
Financing Receivable, Troubled Debt Restructuring [Line Items]
Financing Receivable, Troubled Debt Restructured Loans, Number of Outstanding Contracts \| SecurityLoan				1
Financing Receivable, Troubled Debt Restructuring				$ 1,000,000
Hotel franchise finance [Member]
Financing Receivable, Troubled Debt Restructuring [Line Items]
Financing Receivable, Excluding Accrued Interest, Modified in Period, to Total Financing Receivables, Percentage	0.20%		0.70%
Financing Receivable, Excluding Accrued Interest, Modified in Period, Amount	$ 9,000,000		$ 27,000,000
Financing Receivable, Troubled Debt Restructured Loans, Number of Outstanding Contracts \| SecurityLoan				1
Financing Receivable, Troubled Debt Restructuring				$ 10,000,000
Hotel franchise finance [Member] \| Extended Maturity
Financing Receivable, Troubled Debt Restructuring [Line Items]
Financing Receivable, Excluding Accrued Interest, Modified in Period, Amount	$ 9,000,000		$ 27,000,000
Other Commercial Real Estate Non owner Occupied [Member]
Financing Receivable, Troubled Debt Restructuring [Line Items]
Financing Receivable, Troubled Debt Restructured Loans, Number of Outstanding Contracts \| SecurityLoan				1
Financing Receivable, Troubled Debt Restructuring				$ 1,000,000
Residential Real Estate [Member]
Financing Receivable, Troubled Debt Restructuring [Line Items]
Financing Receivable, Excluding Accrued Interest, Modified in Period, to Total Financing Receivables, Percentage			0.00%
Financing Receivable, Excluding Accrued Interest, Modified in Period, Amount			$ 1,000,000
Residential Real Estate [Member] \| Payment Deferral
Financing Receivable, Troubled Debt Restructuring [Line Items]
Financing Receivable, Excluding Accrued Interest, Modified in Period, Amount			$ 1,000,000
Construction And Land Development Land [Member]
Financing Receivable, Troubled Debt Restructuring [Line Items]
Financing Receivable, Excluding Accrued Interest, Modified in Period, to Total Financing Receivables, Percentage	0.60%		0.60%
Financing Receivable, Excluding Accrued Interest, Modified in Period, Amount	$ 28,000,000		$ 28,000,000
Construction And Land Development Land [Member] \| Extended Maturity
Financing Receivable, Troubled Debt Restructuring [Line Items]
Financing Receivable, Excluding Accrued Interest, Modified in Period, Amount	28,000,000		28,000,000
Residential - EBO
Financing Receivable, Troubled Debt Restructuring [Line Items]
Financing Receivable, Excluding Accrued Interest, Modified in Period, Amount	$ 35,000,000		$ 92,000,000

Loans, Leases and Allowance for Credit Losses Loans, Leases and Allowance for Credit Losses - Collateral Dependent Loans (Details) - USD ($) $ in Millions	Jun. 30, 2023	Mar. 31, 2023	Dec. 31, 2022	Jun. 30, 2022	Mar. 31, 2022	Dec. 31, 2021
Loans and Leases Receivable Disclosure [Line Items]
Loans collectively evaluated for impairment	$ 47,362.0		$ 51,526.0
Financing Receivable, Individually Evaluated for Impairment	513.0		336.0
Loans and Leases Receivable, Net of Deferred Income	47,875.0		51,862.0
Loans collectively evaluated for impairment	306.7		299.0
Total loans individually evaluated for impairment	14.4		10.7
Financing Receivable, Allowance for Credit Loss, Excluding Accrued Interest	321.1	$ 304.7	309.7	$ 273.2	$ 257.6	$ 252.5
Asset Pledged as Collateral
Loans and Leases Receivable Disclosure [Line Items]
Loans and Leases Receivable, Net of Deferred Income	377.0		302.0
Real Estate Collateral [Member] \| Asset Pledged as Collateral
Loans and Leases Receivable Disclosure [Line Items]
Loans and Leases Receivable, Net of Deferred Income	353.0		259.0
Other Collateral [Member] \| Asset Pledged as Collateral
Loans and Leases Receivable Disclosure [Line Items]
Loans and Leases Receivable, Net of Deferred Income	24.0		43.0
Warehouse lending [Member]
Loans and Leases Receivable Disclosure [Line Items]
Loans collectively evaluated for impairment	5,549.0		5,561.0
Financing Receivable, Individually Evaluated for Impairment	0.0		0.0
Loans and Leases Receivable, Net of Deferred Income	5,549.0		5,561.0
Loans collectively evaluated for impairment	5.2		8.4
Total loans individually evaluated for impairment	0.0		0.0
Financing Receivable, Allowance for Credit Loss, Excluding Accrued Interest	5.2	6.6	8.4	3.7	2.9	3.0
Municipal and nonprofit [Member]
Loans and Leases Receivable Disclosure [Line Items]
Loans collectively evaluated for impairment	1,545.0		1,517.0
Financing Receivable, Individually Evaluated for Impairment	13.0		7.0
Loans and Leases Receivable, Net of Deferred Income	1,558.0		1,524.0
Loans collectively evaluated for impairment	14.0		13.4
Total loans individually evaluated for impairment	2.5		2.5
Financing Receivable, Allowance for Credit Loss, Excluding Accrued Interest	16.5	18.4	15.9	13.6	13.4	13.7
Municipal and nonprofit [Member] \| Asset Pledged as Collateral
Loans and Leases Receivable Disclosure [Line Items]
Loans and Leases Receivable, Net of Deferred Income	13.0		7.0
Municipal and nonprofit [Member] \| Real Estate Collateral [Member] \| Asset Pledged as Collateral
Loans and Leases Receivable Disclosure [Line Items]
Loans and Leases Receivable, Net of Deferred Income	0.0		0.0
Municipal and nonprofit [Member] \| Other Collateral [Member] \| Asset Pledged as Collateral
Loans and Leases Receivable Disclosure [Line Items]
Loans and Leases Receivable, Net of Deferred Income	13.0		7.0
Tech & Innovation [Member]
Loans and Leases Receivable Disclosure [Line Items]
Loans collectively evaluated for impairment	2,383.0		2,280.0
Financing Receivable, Individually Evaluated for Impairment	18.0		13.0
Loans and Leases Receivable, Net of Deferred Income	2,401.0		2,293.0
Loans collectively evaluated for impairment	30.1		30.3
Total loans individually evaluated for impairment	3.5		0.5
Financing Receivable, Allowance for Credit Loss, Excluding Accrued Interest	33.6	36.4	30.8	25.4	28.0	25.7
Tech & Innovation [Member] \| Asset Pledged as Collateral
Loans and Leases Receivable Disclosure [Line Items]
Loans and Leases Receivable, Net of Deferred Income	0.0		6.0
Tech & Innovation [Member] \| Real Estate Collateral [Member]
Loans and Leases Receivable Disclosure [Line Items]
Loans and Leases Receivable, Net of Deferred Income	0.0		0.0
Tech & Innovation [Member] \| Other Collateral [Member]
Loans and Leases Receivable Disclosure [Line Items]
Loans and Leases Receivable, Net of Deferred Income	0.0		6.0
Equity fund resources
Loans and Leases Receivable Disclosure [Line Items]
Loans collectively evaluated for impairment	931.0		3,717.0
Financing Receivable, Individually Evaluated for Impairment	0.0		0.0
Loans and Leases Receivable, Net of Deferred Income	931.0		3,717.0
Loans collectively evaluated for impairment	1.7		6.4
Total loans individually evaluated for impairment	0.0		0.0
Financing Receivable, Allowance for Credit Loss, Excluding Accrued Interest	1.7	3.3	6.4	14.0	6.6	9.6
Other commercial and industrial [Member]
Loans and Leases Receivable Disclosure [Line Items]
Loans collectively evaluated for impairment	6,312.0		7,754.0
Financing Receivable, Individually Evaluated for Impairment	84.0		39.0
Loans and Leases Receivable, Net of Deferred Income	6,396.0		7,793.0
Loans collectively evaluated for impairment	46.3		80.4
Total loans individually evaluated for impairment	5.5		5.5
Financing Receivable, Allowance for Credit Loss, Excluding Accrued Interest	51.8	51.1	85.9	119.2	115.7	103.6
Other commercial and industrial [Member] \| Asset Pledged as Collateral
Loans and Leases Receivable Disclosure [Line Items]
Loans and Leases Receivable, Net of Deferred Income	11.0		30.0
Other commercial and industrial [Member] \| Real Estate Collateral [Member] \| Asset Pledged as Collateral
Loans and Leases Receivable Disclosure [Line Items]
Loans and Leases Receivable, Net of Deferred Income	0.0		0.0
Other commercial and industrial [Member] \| Other Collateral [Member] \| Asset Pledged as Collateral
Loans and Leases Receivable Disclosure [Line Items]
Loans and Leases Receivable, Net of Deferred Income	11.0		30.0
Commercial Real Estate Owner Occupied [Member]
Loans and Leases Receivable Disclosure [Line Items]
Loans collectively evaluated for impairment	1,628.0		1,612.0
Financing Receivable, Individually Evaluated for Impairment	20.0		44.0
Loans and Leases Receivable, Net of Deferred Income	1,648.0		1,656.0
Loans collectively evaluated for impairment	8.0		7.1
Total loans individually evaluated for impairment	0.0		0.0
Financing Receivable, Allowance for Credit Loss, Excluding Accrued Interest	8.0	8.6	7.1	7.5	8.1	10.6
Commercial Real Estate Owner Occupied [Member] \| Asset Pledged as Collateral
Loans and Leases Receivable Disclosure [Line Items]
Loans and Leases Receivable, Net of Deferred Income	18.0		42.0
Commercial Real Estate Owner Occupied [Member] \| Real Estate Collateral [Member] \| Asset Pledged as Collateral
Loans and Leases Receivable Disclosure [Line Items]
Loans and Leases Receivable, Net of Deferred Income	18.0		42.0
Commercial Real Estate Owner Occupied [Member] \| Other Collateral [Member] \| Asset Pledged as Collateral
Loans and Leases Receivable Disclosure [Line Items]
Loans and Leases Receivable, Net of Deferred Income	0.0		0.0
Hotel franchise finance [Member]
Loans and Leases Receivable Disclosure [Line Items]
Loans collectively evaluated for impairment	3,884.0		3,607.0
Financing Receivable, Individually Evaluated for Impairment	217.0		200.0
Loans and Leases Receivable, Net of Deferred Income	4,101.0		3,807.0
Loans collectively evaluated for impairment	45.7		44.7
Total loans individually evaluated for impairment	0.0		2.2
Financing Receivable, Allowance for Credit Loss, Excluding Accrued Interest	45.7	47.7	46.9	33.8	30.6	41.5
Hotel franchise finance [Member] \| Asset Pledged as Collateral
Loans and Leases Receivable Disclosure [Line Items]
Loans and Leases Receivable, Net of Deferred Income	174.0		186.0
Hotel franchise finance [Member] \| Real Estate Collateral [Member] \| Asset Pledged as Collateral
Loans and Leases Receivable Disclosure [Line Items]
Loans and Leases Receivable, Net of Deferred Income	174.0		186.0
Hotel franchise finance [Member] \| Other Collateral [Member] \| Asset Pledged as Collateral
Loans and Leases Receivable Disclosure [Line Items]
Loans and Leases Receivable, Net of Deferred Income	0.0		0.0
Other Commercial Real Estate Non owner Occupied [Member]
Loans and Leases Receivable Disclosure [Line Items]
Loans collectively evaluated for impairment	5,659.0		5,428.0
Financing Receivable, Individually Evaluated for Impairment	133.0		29.0
Loans and Leases Receivable, Net of Deferred Income	5,792.0		5,457.0
Loans collectively evaluated for impairment	87.2		47.4
Total loans individually evaluated for impairment	2.9		0.0
Financing Receivable, Allowance for Credit Loss, Excluding Accrued Interest	90.1	66.4	47.4	22.1	15.3	16.9
Other Commercial Real Estate Non owner Occupied [Member] \| Asset Pledged as Collateral
Loans and Leases Receivable Disclosure [Line Items]
Loans and Leases Receivable, Net of Deferred Income	133.0		27.0
Other Commercial Real Estate Non owner Occupied [Member] \| Real Estate Collateral [Member] \| Asset Pledged as Collateral
Loans and Leases Receivable Disclosure [Line Items]
Loans and Leases Receivable, Net of Deferred Income	133.0		27.0
Other Commercial Real Estate Non owner Occupied [Member] \| Other Collateral [Member] \| Asset Pledged as Collateral
Loans and Leases Receivable Disclosure [Line Items]
Loans and Leases Receivable, Net of Deferred Income	0.0		0.0
Residential Real Estate [Member]
Loans and Leases Receivable Disclosure [Line Items]
Loans collectively evaluated for impairment	13,502.0		13,996.0
Financing Receivable, Individually Evaluated for Impairment	0.0		0.0
Loans and Leases Receivable, Net of Deferred Income	13,502.0		13,996.0
Loans collectively evaluated for impairment	33.9		30.4
Total loans individually evaluated for impairment	0.0		0.0
Financing Receivable, Allowance for Credit Loss, Excluding Accrued Interest	33.9	31.7	30.4	18.8	23.8	12.5
Residential - EBO
Loans and Leases Receivable Disclosure [Line Items]
Loans collectively evaluated for impairment	1,432.0		1,884.0
Financing Receivable, Individually Evaluated for Impairment	0.0		0.0
Loans and Leases Receivable, Net of Deferred Income	1,432.0		1,884.0
Loans collectively evaluated for impairment	0.0		0.0
Total loans individually evaluated for impairment	0.0		0.0
Financing Receivable, Allowance for Credit Loss, Excluding Accrued Interest	0.0	0.0	0.0
Construction And Land Development [Member]
Loans and Leases Receivable Disclosure [Line Items]
Loans collectively evaluated for impairment	4,375.0		3,991.0
Financing Receivable, Individually Evaluated for Impairment	28.0		4.0
Loans and Leases Receivable, Net of Deferred Income	4,403.0		3,995.0
Loans collectively evaluated for impairment	31.7		27.4
Total loans individually evaluated for impairment	0.0		0.0
Financing Receivable, Allowance for Credit Loss, Excluding Accrued Interest	31.7	31.5	27.4	12.2	10.7	12.5
Construction And Land Development [Member] \| Asset Pledged as Collateral
Loans and Leases Receivable Disclosure [Line Items]
Loans and Leases Receivable, Net of Deferred Income	28.0		4.0
Construction And Land Development [Member] \| Real Estate Collateral [Member] \| Asset Pledged as Collateral
Loans and Leases Receivable Disclosure [Line Items]
Loans and Leases Receivable, Net of Deferred Income	28.0		4.0
Construction And Land Development [Member] \| Other Collateral [Member] \| Asset Pledged as Collateral
Loans and Leases Receivable Disclosure [Line Items]
Loans and Leases Receivable, Net of Deferred Income	0.0		0.0
Other, loan segment
Loans and Leases Receivable Disclosure [Line Items]
Loans collectively evaluated for impairment	162.0		179.0
Financing Receivable, Individually Evaluated for Impairment	0.0		0.0
Loans and Leases Receivable, Net of Deferred Income	162.0		179.0
Loans collectively evaluated for impairment	2.9		3.1
Total loans individually evaluated for impairment	0.0		0.0
Financing Receivable, Allowance for Credit Loss, Excluding Accrued Interest	$ 2.9	$ 3.0	$ 3.1	$ 2.9	$ 2.5	$ 2.9

Loans, Leases and Allowance for Credit Losses - Allowances for Credit Losses (Detail) Valuation - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022	Mar. 31, 2023	Dec. 31, 2022	Mar. 31, 2022	Dec. 31, 2021
Valuation Allowance [Line Items]
Provision for Loan and Lease Losses	$ 23.8	$ 17.0	$ 24.8	$ 22.3
Financing Receivable, Collectively Evaluated for Impairment	47,362.0		47,362.0			$ 51,526.0
Financing Receivable, Individually Evaluated for Impairment	513.0		513.0			336.0
Loans and Leases Receivable, Net of Deferred Income	47,875.0		47,875.0			51,862.0
Financing Receivable, Allowance for Credit Losses, Collectively Evaluated for Impairment	306.7		306.7			299.0
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment	14.4		14.4			10.7
Off-Balance Sheet, Credit Loss, Liability	41.1	53.8	41.1	53.8	$ 44.8	47.0	$ 43.3	$ 37.6
Loans and Leases Receivable, Allowance	321.0		321.0			310.0
Interest Receivable	296.0		296.0			304.0
Off-Balance Sheet, Credit Loss, Liability, Change in Method, Credit Loss Expense (Reversal)	(3.7)	10.5	(5.9)	16.2
Financing Receivable, Allowance for Credit Loss, Excluding Accrued Interest	321.1	273.2	321.1	273.2	304.7	309.7	257.6	252.5
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss, Writeoff	8.2	2.4	17.4	5.0
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss, Recovery	0.8	1.0	4.0	3.4
Warehouse lending [Member]
Valuation Allowance [Line Items]
Provision for Loan and Lease Losses	1.4	(0.8)	3.2	(0.7)
Financing Receivable, Collectively Evaluated for Impairment	5,549.0		5,549.0			5,561.0
Financing Receivable, Individually Evaluated for Impairment	0.0		0.0			0.0
Loans and Leases Receivable, Net of Deferred Income	5,549.0		5,549.0			5,561.0
Financing Receivable, Allowance for Credit Losses, Collectively Evaluated for Impairment	5.2		5.2			8.4
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment	0.0		0.0			0.0
Financing Receivable, Allowance for Credit Loss, Excluding Accrued Interest	5.2	3.7	5.2	3.7	6.6	8.4	2.9	3.0
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss, Writeoff	0.0	0.0	0.0	0.0
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss, Recovery	0.0	0.0	0.0	0.0
Municipal and nonprofit [Member]
Valuation Allowance [Line Items]
Provision for Loan and Lease Losses	(1.9)	(0.2)	0.6	0.1
Financing Receivable, Collectively Evaluated for Impairment	1,545.0		1,545.0			1,517.0
Financing Receivable, Individually Evaluated for Impairment	13.0		13.0			7.0
Loans and Leases Receivable, Net of Deferred Income	1,558.0		1,558.0			1,524.0
Financing Receivable, Allowance for Credit Losses, Collectively Evaluated for Impairment	14.0		14.0			13.4
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment	2.5		2.5			2.5
Financing Receivable, Allowance for Credit Loss, Excluding Accrued Interest	16.5	13.6	16.5	13.6	18.4	15.9	13.4	13.7
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss, Writeoff	0.0	0.0	0.0	0.0
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss, Recovery	0.0	0.0	0.0	0.0
Tech & Innovation [Member]
Valuation Allowance [Line Items]
Provision for Loan and Lease Losses	(2.8)	(2.6)	4.6	(2.3)
Financing Receivable, Collectively Evaluated for Impairment	2,383.0		2,383.0			2,280.0
Financing Receivable, Individually Evaluated for Impairment	18.0		18.0			13.0
Loans and Leases Receivable, Net of Deferred Income	2,401.0		2,401.0			2,293.0
Financing Receivable, Allowance for Credit Losses, Collectively Evaluated for Impairment	30.1		30.1			30.3
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment	3.5		3.5			0.5
Financing Receivable, Allowance for Credit Loss, Excluding Accrued Interest	33.6	25.4	33.6	25.4	36.4	30.8	28.0	25.7
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss, Writeoff	0.0	0.0	1.8	0.0
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss, Recovery	0.0	0.0	0.0	2.0
Equity fund resources
Valuation Allowance [Line Items]
Provision for Loan and Lease Losses	1.6	(7.4)	4.7	(4.4)
Financing Receivable, Collectively Evaluated for Impairment	931.0		931.0			3,717.0
Financing Receivable, Individually Evaluated for Impairment	0.0		0.0			0.0
Loans and Leases Receivable, Net of Deferred Income	931.0		931.0			3,717.0
Financing Receivable, Allowance for Credit Losses, Collectively Evaluated for Impairment	1.7		1.7			6.4
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment	0.0		0.0			0.0
Financing Receivable, Allowance for Credit Loss, Excluding Accrued Interest	1.7	14.0	1.7	14.0	3.3	6.4	6.6	9.6
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss, Writeoff	0.0	0.0	0.0	0.0
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss, Recovery	0.0	0.0	0.0	0.0
Other commercial and industrial [Member]
Valuation Allowance [Line Items]
Provision for Loan and Lease Losses	(5.9)	5.1	24.8	19.4
Financing Receivable, Collectively Evaluated for Impairment	6,312.0		6,312.0			7,754.0
Financing Receivable, Individually Evaluated for Impairment	84.0		84.0			39.0
Loans and Leases Receivable, Net of Deferred Income	6,396.0		6,396.0			7,793.0
Financing Receivable, Allowance for Credit Losses, Collectively Evaluated for Impairment	46.3		46.3			80.4
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment	5.5		5.5			5.5
Financing Receivable, Allowance for Credit Loss, Excluding Accrued Interest	51.8	119.2	51.8	119.2	51.1	85.9	115.7	103.6
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss, Writeoff	6.0	2.3	13.3	4.9
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss, Recovery	0.8	0.7	4.0	1.1
Commercial Real Estate Owner Occupied [Member]
Valuation Allowance [Line Items]
Provision for Loan and Lease Losses	(0.6)	0.7	0.9	3.2
Financing Receivable, Collectively Evaluated for Impairment	1,628.0		1,628.0			1,612.0
Financing Receivable, Individually Evaluated for Impairment	20.0		20.0			44.0
Loans and Leases Receivable, Net of Deferred Income	1,648.0		1,648.0			1,656.0
Financing Receivable, Allowance for Credit Losses, Collectively Evaluated for Impairment	8.0		8.0			7.1
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment	0.0		0.0			0.0
Financing Receivable, Allowance for Credit Loss, Excluding Accrued Interest	8.0	7.5	8.0	7.5	8.6	7.1	8.1	10.6
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss, Writeoff	0.0	0.0	0.0	0.0
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss, Recovery	0.0	0.1	0.0	0.1
Hotel franchise finance [Member]
Valuation Allowance [Line Items]
Provision for Loan and Lease Losses	(2.0)	(3.2)	(1.2)	7.7
Financing Receivable, Collectively Evaluated for Impairment	3,884.0		3,884.0			3,607.0
Financing Receivable, Individually Evaluated for Impairment	217.0		217.0			200.0
Loans and Leases Receivable, Net of Deferred Income	4,101.0		4,101.0			3,807.0
Financing Receivable, Allowance for Credit Losses, Collectively Evaluated for Impairment	45.7		45.7			44.7
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment	0.0		0.0			2.2
Financing Receivable, Allowance for Credit Loss, Excluding Accrued Interest	45.7	33.8	45.7	33.8	47.7	46.9	30.6	41.5
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss, Writeoff	0.0	0.0	0.0	0.0
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss, Recovery	0.0	0.0	0.0	0.0
Other Commercial Real Estate Non owner Occupied [Member]
Valuation Allowance [Line Items]
Provision for Loan and Lease Losses	25.9	(6.8)	44.9	(5.2)
Financing Receivable, Collectively Evaluated for Impairment	5,659.0		5,659.0			5,428.0
Financing Receivable, Individually Evaluated for Impairment	133.0		133.0			29.0
Loans and Leases Receivable, Net of Deferred Income	5,792.0		5,792.0			5,457.0
Financing Receivable, Allowance for Credit Losses, Collectively Evaluated for Impairment	87.2		87.2			47.4
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment	2.9		2.9			0.0
Financing Receivable, Allowance for Credit Loss, Excluding Accrued Interest	90.1	22.1	90.1	22.1	66.4	47.4	15.3	16.9
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss, Writeoff	2.2	0.0	2.2	0.0
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss, Recovery	0.0	0.0	0.0	0.0
Residential Real Estate [Member]
Valuation Allowance [Line Items]
Provision for Loan and Lease Losses	2.2	(5.0)	3.5	6.3
Financing Receivable, Collectively Evaluated for Impairment	13,502.0		13,502.0			13,996.0
Financing Receivable, Individually Evaluated for Impairment	0.0		0.0			0.0
Loans and Leases Receivable, Net of Deferred Income	13,502.0		13,502.0			13,996.0
Financing Receivable, Allowance for Credit Losses, Collectively Evaluated for Impairment	33.9		33.9			30.4
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment	0.0		0.0			0.0
Financing Receivable, Allowance for Credit Loss, Excluding Accrued Interest	33.9	18.8	33.9	18.8	31.7	30.4	23.8	12.5
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss, Writeoff	0.0	0.0	0.0	0.0
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss, Recovery	0.0	0.0	0.0	0.0
Residential - EBO
Valuation Allowance [Line Items]
Provision for Loan and Lease Losses	0.0		0.0
Financing Receivable, Collectively Evaluated for Impairment	1,432.0		1,432.0			1,884.0
Financing Receivable, Individually Evaluated for Impairment	0.0		0.0			0.0
Loans and Leases Receivable, Net of Deferred Income	1,432.0		1,432.0			1,884.0
Financing Receivable, Allowance for Credit Losses, Collectively Evaluated for Impairment	0.0		0.0			0.0
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment	0.0		0.0			0.0
Interest Receivable	(6.0)		(6.0)			9.0
Financing Receivable, Allowance for Credit Loss, Excluding Accrued Interest	0.0		0.0		0.0	0.0
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss, Writeoff	0.0		0.0
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss, Recovery	0.0		0.0
Construction And Land Development [Member]
Valuation Allowance [Line Items]
Provision for Loan and Lease Losses	0.2	(1.5)	4.3	0.3
Financing Receivable, Collectively Evaluated for Impairment	4,375.0		4,375.0			3,991.0
Financing Receivable, Individually Evaluated for Impairment	28.0		28.0			4.0
Loans and Leases Receivable, Net of Deferred Income	4,403.0		4,403.0			3,995.0
Financing Receivable, Allowance for Credit Losses, Collectively Evaluated for Impairment	31.7		31.7			27.4
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment	0.0		0.0			0.0
Financing Receivable, Allowance for Credit Loss, Excluding Accrued Interest	31.7	12.2	31.7	12.2	31.5	27.4	10.7	12.5
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss, Writeoff	0.0	0.0	0.0	0.0
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss, Recovery	0.0	0.0	0.0	0.0
Other, loan segment
Valuation Allowance [Line Items]
Provision for Loan and Lease Losses	0.1	(0.3)	0.1	0.1
Financing Receivable, Collectively Evaluated for Impairment	162.0		162.0			179.0
Financing Receivable, Individually Evaluated for Impairment	0.0		0.0			0.0
Loans and Leases Receivable, Net of Deferred Income	162.0		162.0			179.0
Financing Receivable, Allowance for Credit Losses, Collectively Evaluated for Impairment	2.9		2.9			3.1
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment	0.0		0.0			0.0
Financing Receivable, Allowance for Credit Loss, Excluding Accrued Interest	2.9	2.9	2.9	2.9	$ 3.0	$ 3.1	$ 2.5	$ 2.9
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss, Writeoff	0.0	0.1	0.1	0.1
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss, Recovery	$ 0.0	$ 0.2	$ 0.0	$ 0.2

Loans, Leases and Allowance for Credit Losses Loans, Leases and Allowance for Credit Losses - Loan Purchases and Sales (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Loans and Leases Receivable Disclosure [Line Items]
Financing Receivable, Sale			$ 1,100.0
Financing Receivable, Excluding Accrued Interest, Modified in Period, Amount	$ 64.0		$ 90.0
Financing Receivable, Excluding Accrued Interest, Modified in Period, to Total Financing Receivables, Percentage	0.10%		0.20%
Payment Deferral and Extended Maturity
Loans and Leases Receivable Disclosure [Line Items]
Financing Receivable, Excluding Accrued Interest, Modified in Period, Amount			$ 2.0
Extended Maturity
Loans and Leases Receivable Disclosure [Line Items]
Financing Receivable, Excluding Accrued Interest, Modified in Period, Amount	$ 64.0		82.0
Payment Deferral
Loans and Leases Receivable Disclosure [Line Items]
Financing Receivable, Excluding Accrued Interest, Modified in Period, Amount			6.0
Financing Receivable, Purchase
Loans and Leases Receivable Disclosure [Line Items]
Financing Receivable, Purchase	$ 511.0	$ 3,100.0	1,000.0	$ 5,500.0
Tech & Innovation [Member]
Loans and Leases Receivable Disclosure [Line Items]
Financing Receivable, Modified in Period, to Total Financing Receivables, Percentage	0.00%
Financing Receivable, Excluding Accrued Interest, Modified in Period, Amount			$ 7.0
Financing Receivable, Excluding Accrued Interest, Modified in Period, to Total Financing Receivables, Percentage			0.30%
Tech & Innovation [Member] \| Payment Deferral and Extended Maturity
Loans and Leases Receivable Disclosure [Line Items]
Financing Receivable, Excluding Accrued Interest, Modified in Period, Amount			$ 2.0
Tech & Innovation [Member] \| Payment Deferral
Loans and Leases Receivable Disclosure [Line Items]
Financing Receivable, Excluding Accrued Interest, Modified in Period, Amount			5.0
Other commercial and industrial [Member]
Loans and Leases Receivable Disclosure [Line Items]
Financing Receivable, Excluding Accrued Interest, Modified in Period, Amount	$ 27.0		$ 27.0
Financing Receivable, Excluding Accrued Interest, Modified in Period, to Total Financing Receivables, Percentage	0.40%		0.40%
Other commercial and industrial [Member] \| Extended Maturity
Loans and Leases Receivable Disclosure [Line Items]
Financing Receivable, Excluding Accrued Interest, Modified in Period, Amount	$ 27.0		$ 27.0
Residential Real Estate [Member]
Loans and Leases Receivable Disclosure [Line Items]
Financing Receivable, Excluding Accrued Interest, Modified in Period, Amount			$ 1.0
Financing Receivable, Excluding Accrued Interest, Modified in Period, to Total Financing Receivables, Percentage			0.00%
Residential Real Estate [Member] \| Payment Deferral
Loans and Leases Receivable Disclosure [Line Items]
Financing Receivable, Excluding Accrued Interest, Modified in Period, Amount			$ 1.0
Hotel franchise finance [Member]
Loans and Leases Receivable Disclosure [Line Items]
Financing Receivable, Excluding Accrued Interest, Modified in Period, Amount	$ 9.0		$ 27.0
Financing Receivable, Excluding Accrued Interest, Modified in Period, to Total Financing Receivables, Percentage	0.20%		0.70%
Hotel franchise finance [Member] \| Extended Maturity
Loans and Leases Receivable Disclosure [Line Items]
Financing Receivable, Excluding Accrued Interest, Modified in Period, Amount	$ 9.0		$ 27.0
Construction And Land Development Land [Member]
Loans and Leases Receivable Disclosure [Line Items]
Financing Receivable, Excluding Accrued Interest, Modified in Period, Amount	$ 28.0		$ 28.0
Financing Receivable, Excluding Accrued Interest, Modified in Period, to Total Financing Receivables, Percentage	0.60%		0.60%
Construction And Land Development Land [Member] \| Extended Maturity
Loans and Leases Receivable Disclosure [Line Items]
Financing Receivable, Excluding Accrued Interest, Modified in Period, Amount	$ 28.0		$ 28.0

MSR Portfolio (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
MSR Portfolio (Details) - USD ($) $ in Millions	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022	Mar. 31, 2023	Dec. 31, 2022	Mar. 31, 2022	Dec. 31, 2021
Servicing Assets at Fair Value [Line Items]
Servicing Asset at Fair Value, Amount	$ 1,007.0	$ 826.0	$ 1,007.0	$ 826.0	$ 910.0	$ 1,148.0	$ 950.0	$ 698.0
Servicing Asset at Fair Value, Additions	245.0	194.0	387.2	397.5
Servicing Asset at Fair Value, Disposals	(149.0)	(350.0)	(499.0)	(350.0)
Servicing Asset at Fair Value, Changes in Fair Value Resulting from Changes in Valuation Inputs or Changes in Assumptions	24.0	62.0	16.0	143.0
Servicing Asset at Fair Value, Other Changes that Affect Balance	1.0	0.0	4.0	0.0
Servicing Asset at Fair Value, Other Changes in Fair Value	(24.0)	(30.0)	(49.0)	(63.0)
MSR UPB of underlying loans	8,800.0	24,100.0	28,300.0	24,100.0
Continuing Involvement with Transferred Financial Assets, Principal Amount Outstanding	59,705.0	52,184.0	59,705.0	52,184.0
Contractually Specified Servicing Fee, Late Fee, and Ancillary Fee Earned in Exchange for Servicing Financial Asset	54.0	48.9	116.9	91.8
MSR Loan Sales, Receivable	74.0		74.0			$ 39.0
Mortgage servicing asset
Servicing Assets at Fair Value [Line Items]
Servicing Asset at Fair Value, Other Changes in Fair Value	0.0
Contractually Specified Servicing Fee, Late Fee, and Ancillary Fee Earned in Exchange for Servicing Financial Asset	0.0
Servicing Contracts
Servicing Assets at Fair Value [Line Items]
Servicing Asset at Fair Value, Disposals	$ (150.0)	$ (350.0)	$ (501.0)	$ (350.0)

UPB in MSR Portfolio (Details) - USD ($) $ in Millions	Jun. 30, 2023	Dec. 31, 2022	Jun. 30, 2022
Servicing Assets at Fair Value [Line Items]
Continuing Involvement with Transferred Financial Assets, Principal Amount Outstanding	$ 59,705		$ 52,184
Servicing advances, net	$ (77)	$ (102)

Hypothetical Change in FV (Details) - USD ($) $ in Millions	Jun. 30, 2023	Mar. 31, 2023	Dec. 31, 2022	Jun. 30, 2022	Mar. 31, 2022	Dec. 31, 2021
Servicing Assets at Fair Value [Line Items]
Servicing Asset at Fair Value, Amount	$ 1,007	$ 910	$ 1,148	$ 826	$ 950	$ 698
Sensitivity Analysis of Fair Value, Transferor's Interests in Transferred Financial Assets, Impact of 50 basis point Adverse Interest Rate Change	(57)
Sensitivity Analysis of Fair Value, Transferor's Interests in Transferred Financial Assets, Impact of 50 basis point Favorable Interest Rate Change	53
Sensitivity Analysis of Fair Value, Transferor's Interests in Transferred Financial Assets, Impact of 50 basis point Discount Rate Increase	(19)
Sensitivity Analysis of Fair Value, Transferor's Interests in Transferred Financial Assets, Impact of 50 basis point Discount Rate Decrease	20
Sensitivity Analysis of Fair Value, Transferor's Interests in Transferred Financial Assets, Impact of 1 Percent Adverse Change in Prepayment Speed	(26)
Sensitivity Analysis of Fair Value, Transferor's Interests in Transferred Financial Assets, Impact of 1 Percent Adverse Change in Prepayment Speed	28
Sensitivity Analysis of Fair Value, Transferor's Interests in Transferred Financial Assets, Impact of 10 Percent Increase Cost of Service	(12)
Sensitivity Analysis of Fair Value, Transferor's Interests in Transferred Financial Assets, Impact of 10 Percent Decrease Cost of Service	$ 12

Net Loan Servicing Revenue (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022	Dec. 31, 2022
Servicing Assets at Fair Value [Line Items]
Contractually Specified Servicing Fee, Late Fee, and Ancillary Fee Earned in Exchange for Servicing Financial Asset	$ 54.0	$ 48.9	$ 116.9	$ 91.8
Servicing Asset at Fair Value, Other Changes in Fair Value	(24.0)	(30.0)	(49.0)	(63.0)
Unrealized Gain (Loss) on Derivatives	(37.2)	49.8	(15.0)	(31.4)
Expense Related to Distribution or Servicing and Underwriting Fees	18.4	$ 14.7	32.2	$ 25.5
Servicing advances, net	77.0		$ 77.0		$ 102.0
Mortgage servicing asset
Servicing Assets at Fair Value [Line Items]
Servicing Asset at Fair Value, Additions	0.0
Contractually Specified Servicing Fee, Late Fee, and Ancillary Fee Earned in Exchange for Servicing Financial Asset	0.0
Servicing Asset at Fair Value, Other Changes in Fair Value	0.0
Cash Flows Between Transferor and Transferee, Servicing Fees	0.0
Gain (Loss) on Disposition of Assets for Financial Service Operations	0.0
Unrealized Gain (Loss) on Derivatives	0.0
Derivative Instruments Not Designated as Hedging Instruments, Loss	0.0
Expense Related to Distribution or Servicing and Underwriting Fees	0.0
Contractually Specified Servicing Fees, Amount	$ 0.0

Other Borrowings - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Millions	Jun. 30, 2023	Dec. 31, 2022	Jun. 30, 2022
Debt [Line Items]
FHLB advances	$ 4,900.0	$ 4,300.0
Warehouse Agreement Borrowings	55.0	0.0
Other Short-term Borrowings	62.0	25.0
Short-term Debt	8,799.0	4,992.0
Senior Notes	314.0	315.0
Notes Payable	454.0	992.0
Long-term Debt	768.0	1,307.0
Other borrowings	9,567.0	6,299.0
Customer repurchase agreements	2,482.0	27.0
Federal Funds Purchased	0.0	640.0
BTFP advances
Debt [Line Items]
Other Short-term Borrowings	1,300.0	0.0
Securities Repurchase Agreements
Debt [Line Items]
Customer repurchase agreements	1,400.0	0.0
Customer Repurchase Agreements
Debt [Line Items]
Customer repurchase agreements	5.0	27.0
Early Buyout Repurchase Agreements
Debt [Line Items]
Customer repurchase agreements	$ 1,100.0	$ 0.0
ATM Offering
Debt [Line Items]
Shares Issued, Price Per Share			$ 86.78
Grant year 2020 \| Performance Shares [Member]
Debt [Line Items]
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Nonvested, Number	157,784
Grant year 2019 \| Performance Shares [Member]
Debt [Line Items]
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Nonvested, Number		203,646
Senior Notes
Debt [Line Items]
Debt Instrument, Face Amount	$ 300.0
Debt Instrument, Interest Rate, Stated Percentage	6.50%
Credit Linked Notes Maturing July 2059
Debt [Line Items]
Debt Instrument, Face Amount	$ 197.0	$ 202.0
Debt Issuance Costs, Net	3.0	3.0
Credit Linked Notes Maturing April 2052
Debt [Line Items]
Debt Instrument, Face Amount	184.0	189.0
Debt Issuance Costs, Net	3.0	3.0
Credit Linked Notes Maturing June 2028
Debt [Line Items]
Debt Instrument, Face Amount		300.0
Debt Issuance Costs, Net		4.0
Credit Linked Notes Maturing December 2024
Debt [Line Items]
Debt Instrument, Face Amount		242.0
Debt Issuance Costs, Net		2.0
Credit Linked Notes Maturing October 2052
Debt [Line Items]
Debt Instrument, Face Amount	92.0	95.0
Debt Issuance Costs, Net	2.0	2.0
Federal Home Loan Bank Advances [Member]
Debt [Line Items]
Additional available credit with the entity	6,200.0	6,800.0
FRB [Member]
Debt [Line Items]
Additional available credit with the entity	16,000.0	$ 5,200.0
Federal Reserve Bank BTFP Advances
Debt [Line Items]
Additional available credit with the entity	34.0
Warehouse Agreement Borrowings
Debt [Line Items]
Additional available credit with the entity	2,800.0
Revolving Credit Facility
Debt [Line Items]
Secured borrowing credit line	$ 175.0

Qualifying Debt (Details) $ / shares in Units, $ in Millions	6 Months Ended
	Jun. 30, 2023 USD ($) Trust $ / shares	Jun. 30, 2022 $ / shares	Dec. 31, 2022 USD ($)
Debt Instrument [Line Items]
Common Stock, Dividends, Per Share, Cash Paid \| $ / shares	$ 0.36	$ 0.35
Number of Statutory Business Trusts Formed or Acquired \| Trust	8
Junior Subordinated Debenture Owed to Unconsolidated Subsidiary Trust	$ 71		$ 76
Subordinated Long-term Debt, Noncurrent	817		817
Subordinated Debt [Member] \| Subordinated Debentures Maturing June 2030 [Member] [Member]
Debt Instrument [Line Items]
Debt Instrument, Face Amount	$ 225		$ 225
Debt Instrument, Interest Rate, Stated Percentage	5.25%		5.25%
Debt Issuance Costs, Net	$ 1		$ 1
Subordinated Debt [Member] \| Subordinated Debentures Maturing June 2031
Debt Instrument [Line Items]
Debt Instrument, Face Amount	$ 600		$ 600
Debt Instrument, Interest Rate, Stated Percentage	3.00%		3.00%
Debt Issuance Costs, Net	$ 7		$ 7
Junior Subordinated Debt [Member]
Debt Instrument [Line Items]
Long-term Debt, Weighted Average Interest Rate, at Point in Time	7.88%		7.11%

Stockholders' Equity - Additional Information (Detail) - USD ($)
$ / shares in Units, $ in Millions

3 Months Ended

6 Months Ended

Jun. 30, 2023

Jun. 30, 2022

Jun. 30, 2023

Jun. 30, 2022

Dec. 31, 2022

Common Stock, Dividends, Per Share, Cash Paid

$ 39.4

$ 37.9

$ 78.8

$ 75.2

$ 0.36

$ 0.35

Share-based Payment Arrangement, Shares Withheld for Tax Withholding Obligation

7,815

2,635

151,219

188,169

Treasury Stock Acquired, Average Cost Per Share

$ 31.96

$ 77.50

$ 72.49

$ 93.29

Stock Issued During Period, Shares, New Issues

1,300,000

Stock Issued During Period, Value, New Issues

$ 107.7

Adjustments to Additional Paid in Capital, Stock Issued, Issuance Costs

0.7

Proceeds from Issuance of Common Stock

$ 0.0

$ 107.7

Preferred Stock, Dividends, Per Share, Cash Paid

$ 0.27

0.27

Preferred Stock, Shares Outstanding

12,000,000

ATM Offering

Share-based Compensation Arrangement by Share-based Payment Award [Line Items]

Shares Issued, Price Per Share

$ 86.78

Stock Issued During Period, Value, New Issues

$ 108.4

Performance Shares [Member]

Share-based Compensation Arrangement by Share-based Payment Award [Line Items]

Share-based Payment Arrangement, Expense

$ 1.4

$ 3.4

$ 1.1

6.2

Restricted Stock [Member]

Share-based Compensation Arrangement by Share-based Payment Award [Line Items]

Shares Granted, Value, Share-based Payment Arrangement, before Forfeiture

0.7

45.2

Share-based Payment Arrangement, Expense

9.1

7.6

17.6

14.7

Retained Earnings [Member]

Share-based Compensation Arrangement by Share-based Payment Award [Line Items]

Share-based Compensation Arrangement by Share-based Payment Award [Line Items]

$ 39.4

$ 37.9

$ 78.8

$ 75.2

Common Stock [Member]

Stock Issued During Period, Shares, New Issues

^[1]

0

100,000

200,000

1,300,000

Share-based Compensation Arrangement by Share-based Payment Award [Line Items]

Preferred Stock, Shares Outstanding

12,000,000

[1]

The fair value of assets and liabilities measured at fair value on a recurring basis was determined using the following inputs:


	Fair Value Measurements at the End of the Reporting Period Using:
	Quoted Prices in Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)		Fair Value
June 30, 2023	(in millions)

Assets:




Available-for-sale debt securities
CLO	$	—	$	2,144	$	—	$	2,144
Commercial MBS issued by GSEs	—		60		—		60
Corporate debt securities	—		338		—		338
Private label residential MBS	—		1,141		—		1,141
Residential MBS issued by GSEs	—		1,765		—		1,765
Tax-exempt	—		830		—		830

U.S. Treasury securities	2,286		—		—		2,286
Other	27		40		—		67
Total AFS debt securities	$	2,313	$	6,318	$	—	$	8,631
Equity securities
Common stock	$	2	$	—	$	—	$	2
CRA investments	25		12		—		37
Preferred stock	95		5		—		100
Total equity securities	$	122	$	17	$	—	$	139
Loans HFS (2)	$	—	$	1,337	$	3	$	1,340
MSRs	—		—		1,007		1,007
Derivative assets (1)	—		98		6		104
Liabilities:
Junior subordinated debt (3)	$	—	$	—	$	57	$	57
Derivative liabilities (1)	—		37		4		41

(1)See "Note 11. Derivatives and Hedging Activities." In addition, the carrying value of loans is decreased by $52 million as of June 30, 2023 for the effective portion of the hedge, which relates to the fair value of the hedges put in place to mitigate against fluctuations in interest rates. Derivative assets and liabilities exclude margin of $85 million and $12 million, respectively.

(2)Includes only the portion of loans HFS that is recorded at fair value at each reporting period pursuant to the election of FVO treatment.

(3)Includes only the portion of junior subordinated debt that is recorded at fair value at each reporting period pursuant to the election of FVO treatment.


	Fair Value Measurements at the End of the Reporting Period Using:
	Quoted Prices in Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)		Fair Value
December 31, 2022	(in millions)

Assets:




Available-for-sale debt securities
CLO	$	—	$	2,706	$	—	$	2,706
Commercial MBS issued by GSEs	—		97		—		97
Corporate debt securities	—		390		—		390
Private label residential MBS	—		1,199		—		1,199
Residential MBS issued by GSEs	—		1,740		—		1,740
Tax-exempt	—		891		—		891


Other	24		45		—		69
Total AFS debt securities	$	24	$	7,068	$	—	$	7,092
Equity securities
Common stock	$	3	$	—	$	—	$	3
CRA investments	24		25		—		49
Preferred stock	108		—		—		108
Total equity securities	$	135	$	25	$	—	$	160
Loans - HFS (2)	$	—	$	1,172	$	1	$	1,173
Mortgage servicing rights	—		—		1,148		1,148
Derivative assets (1)	—		42		5		47
Liabilities:
Junior subordinated debt (3)	$	—	$	—	$	63	$	63
Derivative liabilities (1)	—		36		3		39

(1)See "Note 11. Derivatives and Hedging Activities." In addition, the carrying value of loans is decreased by $17 million as of December 31, 2022 for the effective portion of the hedge, which relates to the fair value of the hedges put in place to mitigate against fluctuations in interest rates. Derivative assets and liabilities exclude margin of $4 million and $1 million, respectively.

(2)Includes only the portion of loans HFS that is recorded at fair value at each reporting period pursuant to the election of FVO treatment.

(3)Includes only the portion of junior subordinated debt that is recorded at fair value at each reporting period pursuant to the election of FVO treatment.

Stockholders' Equity Common Stock Repurchase (Details) - USD ($) $ / shares in Units, $ in Millions	6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Adjustments to Additional Paid in Capital, Stock Issued, Issuance Costs		$ 0.7
Common Stock, Dividends, Per Share, Cash Paid	$ 0.36	$ 0.35

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 718
-SubTopic 10
-Name Accounting Standards Codification
-Section 35
-Paragraph 1D
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-URI https://asc.fasb.org//1943274/2147480483/718-10-35-1D

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
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Reference 3: http://www.xbrl.org/2003/role/disclosureRef
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Reference 4: http://www.xbrl.org/2003/role/disclosureRef
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Reference 5: http://www.xbrl.org/2003/role/disclosureRef
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Reference 6: http://www.xbrl.org/2003/role/disclosureRef
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Reference 7: http://www.xbrl.org/2003/role/disclosureRef
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Reference 9: http://www.xbrl.org/2003/role/disclosureRef
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Reference 10: http://www.xbrl.org/2003/role/disclosureRef
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Reference 11: http://www.xbrl.org/2003/role/disclosureRef
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Reference 12: http://www.xbrl.org/2003/role/disclosureRef
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Reference 13: http://www.xbrl.org/2003/role/disclosureRef
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Reference 14: http://www.xbrl.org/2003/role/disclosureRef
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Reference 18: http://www.xbrl.org/2003/role/disclosureRef
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Reference 19: http://www.xbrl.org/2003/role/disclosureRef
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-Subparagraph (d)(2)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480429/718-10-50-2

Reference 22: http://www.xbrl.org/2003/role/disclosureRef
-Topic 718
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (e)(1)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480429/718-10-50-2

Reference 23: http://www.xbrl.org/2003/role/disclosureRef
-Topic 718
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (e)(2)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480429/718-10-50-2

Reference 24: http://www.xbrl.org/2003/role/disclosureRef
-Topic 718
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (f)(2)(i)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480429/718-10-50-2

Reference 25: http://www.xbrl.org/2003/role/disclosureRef
-Topic 718
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (f)(2)(ii)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480429/718-10-50-2

Reference 26: http://www.xbrl.org/2003/role/disclosureRef
-Topic 718
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (f)(2)(iii)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480429/718-10-50-2

Reference 27: http://www.xbrl.org/2003/role/disclosureRef
-Topic 718
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (f)(2)(iv)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480429/718-10-50-2

Reference 28: http://www.xbrl.org/2003/role/disclosureRef
-Topic 718
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (f)(2)(v)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480429/718-10-50-2

Accumulated Other Comprehensive Income - Summary of Changes in Accumulated Other Comprehensive Income (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance	$ (591,500)	$ (235,100)	$ (661,000)	$ (15,700)
Other comprehensive income before reclassifications	29,200	282,500	(31,000)	528,200
Amounts reclassified from accumulated other comprehensive income	(10,200)	300	(19,500)	5,400
Net other comprehensive (loss) income	19,000	282,800	(50,500)	533,600
Ending balance	(610,500)	(517,900)	(610,500)	(517,900)
Unrealized holding gains (losses) on AFS
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance	(594,300)	(236,300)	(663,700)	(16,700)
Other comprehensive income before reclassifications	34,200	284,500	(25,900)	532,400
Amounts reclassified from accumulated other comprehensive income	(10,200)	300	(19,500)	5,400
Net other comprehensive (loss) income	24,000	284,800	(45,400)	537,800
Ending balance	(618,300)	(521,100)	(618,300)	(521,100)
Accumulated Gain (Loss), Financial Liability, Fair Value Option, Attributable to Parent [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance	1,900	1,500	3,000	(700)
Other comprehensive income before reclassifications	5,000	(2,000)	(3,900)	4,200
Amounts reclassified from accumulated other comprehensive income	0	0	0	0
Net other comprehensive (loss) income	5,000	(2,000)	(3,900)	4,200
Ending balance	6,900	3,500	6,900	3,500
Impairment loss on securities
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance	1,200	0	0	0
Other comprehensive income before reclassifications	0	0	(1,200)	0
Amounts reclassified from accumulated other comprehensive income	0	0	0	0
Net other comprehensive (loss) income	0	0	(1,200)	0
Ending balance	1,200	0	1,200	0
Supplemental Employee Retirement Plan [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance	300	(300)	300	(300)
Other comprehensive income before reclassifications	0	0	0	0
Amounts reclassified from accumulated other comprehensive income	0	0	0	0
Net other comprehensive (loss) income	0	0	0	0
Ending balance	$ 300	$ (300)	$ 300	$ (300)

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

Amount, after tax, of accumulated increase (decrease) in equity from transaction and other event and circumstance from nonowner source.

Amount after tax and reclassification adjustments of other comprehensive income (loss).

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-SubTopic 10
-Topic 505
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147481112/505-10-50-2

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 830
-SubTopic 30
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147481674/830-30-50-1

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Topic 830
-SubTopic 30
-Name Accounting Standards Codification
-Section 45
-Paragraph 17
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147481694/830-30-45-17

Reference 4: http://www.xbrl.org/2003/role/disclosureRef
-Topic 944
-SubTopic 220
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-04(19))
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147483586/944-220-S99-1

Reference 5: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 220
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 4
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482765/220-10-50-4

Reference 6: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 220
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 5
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482765/220-10-50-5

Reference 7: http://www.xbrl.org/2003/role/disclosureRef
-Topic 830
-SubTopic 30
-Name Accounting Standards Codification
-Section 45
-Paragraph 20
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147481694/830-30-45-20

Reference 8: http://www.xbrl.org/2003/role/disclosureRef
-Topic 220
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03(21))
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147483621/220-10-S99-2

Reference 9: http://www.xbrl.org/2003/role/disclosureRef
-Topic 942
-SubTopic 220
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-04(23))
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147483589/942-220-S99-1

Reference 10: http://www.xbrl.org/2003/role/disclosureRef
-Topic 220
-SubTopic 10
-Name Accounting Standards Codification
-Section 45
-Paragraph 1B
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482790/220-10-45-1B

Reference 11: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Section 55
-Paragraph 15
-SubTopic 10
-Topic 220
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482739/220-10-55-15

Reference 12: http://www.xbrl.org/2003/role/disclosureRef
-Topic 220
-SubTopic 10
-Name Accounting Standards Codification
-Section 45
-Paragraph 1A
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482790/220-10-45-1A

Accumulated Other Comprehensive Income - Schedule of Reclassifications Out of Accumulated Other Comprehensive Income (Detail) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Accumulated Other Comprehensive Income (Loss) [Line Items]
Amount reclassified from accumulated other comprehensive income	$ (3.4)	$ (0.1)	$ (6.6)	$ 1.9
Amount reclassified from accumulated other comprehensive income	$ (10.2)	$ 0.3	$ (19.5)	$ 5.4

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

Derivatives and Hedging Fair Value of Derivative Contracts (Detail) - USD ($) $ in Millions	Jun. 30, 2023	Dec. 31, 2022	Jun. 30, 2022
Derivatives, Fair Value [Line Items]
Derivative Asset, Fair Value	$ 182.0	$ 36.0	$ 60.0
Derivative Liability, Fair Value	(34.0)	(21.0)	(79.0)
Derivative Asset, Not Subject to Master Netting Arrangement	7.0	15.0	19.0
Derivative Liability, Not Subject to Master Netting Arrangement	(19.0)	(19.0)	(4.0)
Derivative Asset, Fair Value, Offset Against Collateral, Net of Not Subject to Master Netting Arrangement, Policy Election	161.0	34.0	24.0
Derivative Asset, Fair Value, Gross Asset Including Not Subject to Master Netting Arrangement	189.0	51.0	79.0
Derivative Liability, Collateral, Right to Reclaim Cash, Offset	(12.0)	1.0	24.0
Derivative Liability, Subject to Master Netting Arrangement, Asset Offset	28.0	17.0	55.0
Derivative Liability, Fair Value, Offset Against Collateral, Net of Not Subject to Master Netting Arrangement, Policy Election	25.0	23.0	28.0
Derivative Liability, Fair Value, Gross Liability Including Not Subject to Master Netting Arrangement	53.0	40.0	83.0
Derivative Asset, Collateral, Obligation to Return Cash, Offset	85.0	(4.0)	9.0
Derivative Asset, Subject to Master Netting Arrangement, Liability Offset	(28.0)	(17.0)	(55.0)
Derivative Asset, Subject to Master Netting Arrangement, after Offset	154.0	19.0	5.0
Derivative Liability, Subject to Master Netting Arrangement, after Offset	6.0	4.0	24.0
Interest Rate Swap [Member]
Derivatives, Fair Value [Line Items]
Derivative Asset, Fair Value	70.0	18.0	5.0
Derivative Liability, Fair Value	(4.0)	0.0	(11.0)
Derivative Asset, Not Subject to Master Netting Arrangement	0.0	6.0	0.0
Derivative Liability, Not Subject to Master Netting Arrangement	(14.0)	(6.0)	0.0
Derivative Netting Adjustments, Liabilities	0.0	0.0	0.0
Derivative Netting Adjustments, Assets	0.0	0.0	0.0
Derivative Asset, Subject to Master Netting Arrangement, after Offset	70.0	18.0	5.0
Derivative Liability, Subject to Master Netting Arrangement, after Offset	4.0	0.0	11.0
Foreign Exchange Contract [Member]
Derivatives, Fair Value [Line Items]
Derivative Asset, Not Subject to Master Netting Arrangement	1.0	1.0	1.0
Derivative Liability, Not Subject to Master Netting Arrangement	(1.0)	(9.0)	0.0
Interest Rate Lock Commitments
Derivatives, Fair Value [Line Items]
Derivative Asset, Not Subject to Master Netting Arrangement	6.0	5.0	15.0
Derivative Liability, Not Subject to Master Netting Arrangement	(4.0)	(3.0)	(3.0)
Forward purchase contracts
Derivatives, Fair Value [Line Items]
Derivative Asset, Fair Value	1.0	1.0	31.0
Derivative Liability, Fair Value	(16.0)	(12.0)	(10.0)
Derivative Asset, Not Subject to Master Netting Arrangement	0.0	0.0	1.0
Derivative Liability, Not Subject to Master Netting Arrangement	0.0	(1.0)	0.0
Derivative Netting Adjustments, Liabilities	0.0	0.0	0.0
Derivative Netting Adjustments, Assets	0.0	0.0	0.0
Derivative Asset, Subject to Master Netting Arrangement, after Offset	1.0	1.0	31.0
Derivative Liability, Subject to Master Netting Arrangement, after Offset	16.0	12.0	10.0
Forward sales contracts
Derivatives, Fair Value [Line Items]
Derivative Asset, Fair Value	26.0	13.0	33.0
Derivative Liability, Fair Value	(2.0)	(8.0)	(34.0)
Derivative Asset, Not Subject to Master Netting Arrangement	0.0	3.0	2.0
Derivative Liability, Not Subject to Master Netting Arrangement	0.0	0.0	(1.0)
Derivative Netting Adjustments, Liabilities	0.0	0.0	0.0
Derivative Netting Adjustments, Assets	0.0	0.0	0.0
Derivative Asset, Subject to Master Netting Arrangement, after Offset	26.0	13.0	33.0
Derivative Liability, Subject to Master Netting Arrangement, after Offset	2.0	8.0	34.0
Not Designated as Hedging Instrument [Member]
Derivatives, Fair Value [Line Items]
Derivative, Notional Amount	29,043.0	19,695.0	24,178.0
Derivative Instruments Not Designated as Hedging Instruments, Liability, at Fair Value	37.0	39.0	48.0
Derivative Instruments Not Designated as Hedging Instruments, Asset, at Fair Value	48.0	29.0	83.0
Not Designated as Hedging Instrument [Member] \| Interest Rate Swap [Member]
Derivatives, Fair Value [Line Items]
Derivative, Notional Amount	2,424.0	1,538.0	64.0
Derivative Instruments Not Designated as Hedging Instruments, Liability, at Fair Value	14.0	6.0	0.0
Derivative Instruments Not Designated as Hedging Instruments, Asset, at Fair Value	14.0	6.0	0.0
Not Designated as Hedging Instrument [Member] \| Foreign Exchange Contract [Member]
Derivatives, Fair Value [Line Items]
Derivative, Notional Amount	71.0	250.0	138.0
Derivative Instruments Not Designated as Hedging Instruments, Liability, at Fair Value	1.0	9.0	0.0
Derivative Instruments Not Designated as Hedging Instruments, Asset, at Fair Value	1.0	1.0	1.0
Not Designated as Hedging Instrument [Member] \| Interest Rate Lock Commitments
Derivatives, Fair Value [Line Items]
Derivative, Notional Amount	2,331.0	1,459.0	2,819.0
Derivative Instruments Not Designated as Hedging Instruments, Liability, at Fair Value	4.0	3.0	3.0
Derivative Instruments Not Designated as Hedging Instruments, Asset, at Fair Value	6.0	5.0	15.0
Not Designated as Hedging Instrument [Member] \| Forward purchase contracts
Derivatives, Fair Value [Line Items]
Derivative, Notional Amount	4,484.0	2,709.0	4,764.0
Derivative Instruments Not Designated as Hedging Instruments, Liability, at Fair Value	16.0	13.0	10.0
Derivative Instruments Not Designated as Hedging Instruments, Asset, at Fair Value	1.0	1.0	32.0
Not Designated as Hedging Instrument [Member] \| Forward sales contracts
Derivatives, Fair Value [Line Items]
Derivative, Notional Amount	7,279.0	4,985.0	9,621.0
Derivative Instruments Not Designated as Hedging Instruments, Liability, at Fair Value	2.0	8.0	35.0
Derivative Instruments Not Designated as Hedging Instruments, Asset, at Fair Value	26.0	16.0	35.0
Not Designated as Hedging Instrument [Member] \| Futures purchase contracts
Derivatives, Fair Value [Line Items]
Derivative, Notional Amount	200.0	0.0	700.0
Derivative Instruments Not Designated as Hedging Instruments, Liability, at Fair Value	0.0	0.0	0.0
Derivative Instruments Not Designated as Hedging Instruments, Asset, at Fair Value	0.0	0.0	0.0
Not Designated as Hedging Instrument [Member] \| Futures sales contracts
Derivatives, Fair Value [Line Items]
Derivative, Notional Amount	12,210.0	8,706.0	6,072.0
Derivative Instruments Not Designated as Hedging Instruments, Liability, at Fair Value	0.0	0.0	0.0
Derivative Instruments Not Designated as Hedging Instruments, Asset, at Fair Value	0.0	0.0	0.0
Not Designated as Hedging Instrument [Member] \| Risk participation agreements
Derivatives, Fair Value [Line Items]
Derivative, Notional Amount	44.0	48.0	0.0
Derivative Instruments Not Designated as Hedging Instruments, Liability, at Fair Value	0.0	0.0	0.0
Derivative Instruments Not Designated as Hedging Instruments, Asset, at Fair Value	0.0	0.0	0.0
Designated as Hedging Instrument [Member]
Derivatives, Fair Value [Line Items]
Derivative Asset, Fair Value	56.0	18.0	5.0
Derivative Liability, Fair Value	(4.0)	0.0	(11.0)
Derivative, Notional Amount	4,033.0	476.0	500.0
Designated as Hedging Instrument [Member] \| Interest Rate Swap [Member]
Derivatives, Fair Value [Line Items]
Derivative, Notional Amount	4,033.0	476.0	500.0
Derivative Instruments in Hedges, Assets, at Fair Value	56.0	18.0	5.0
Fair Value Hedge Liabilities	$ 4.0	$ 0.0	$ 11.0

Derivatives and Hedging Pre-Tax Net Gains (Losses) on Fair Value Hedges (Detail) - Interest Income - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Derivative Instruments, Gain (Loss) [Line Items]
Change in Unrealized Gain (Loss) on Fair Value Hedging Instruments	$ 39.0	$ 15.2	$ 34.7	$ 48.7
Change in Unrealized Gain (Loss) on Hedged Item in Fair Value Hedge	$ (39.0)	$ (15.2)	$ (34.7)	$ (48.7)

Derivatives and Hedging Additional Information (Detail) - USD ($)
$ in Millions

3 Months Ended

6 Months Ended

Jun. 30, 2023

Jun. 30, 2022

Jun. 30, 2023

Jun. 30, 2022

Dec. 31, 2022

Hedged Asset, Fair Value Hedge

$ 3,934.0

$ 447.0

Fair Value Hedge Assets, Loans

^[1]

52.0

17.0

Derivative Liability, Fair Value

34.0

$ 79.0

34.0

$ 79.0

21.0

Net gain on loan origination and sale activities

42.1

118.1

17.5

334.9

42.1

118.1

17.6

334.9

Loan servicing fees, net

Interest Rate Lock Commitments | Net gain on loan origination and sale activities

(31.0)

(29.9)

(17.6)

(86.8)

Forward Contracts | Net gain on loan origination and sale activities

(11.1)

23.2

0.3

2.4

Forward Contracts | Loan servicing fees, net

55.6

101.0

18.8

342.3

Future | Loan servicing fees, net

(13.2)

(8.0)

(14.7)

(42.9)

Other Contract | Net gain on loan origination and sale activities

18.7

(21.9)

14.7

(43.9)

Interest Rate Swap [Member]

2.2

(6.1)

1.8

(9.8)

Derivative Liability, Fair Value

4.0

11.0

4.0

11.0

0.0

Interest Rate Swap [Member] | Net gain on loan origination and sale activities

Interest Rate Swap [Member] | Loan servicing fees, net

(4.6)

0.0

(3.3)

0.0

Designated as Hedging Instrument [Member]

(36.5)

0.0

(17.6)

0.0

Derivative Liability, Fair Value

$ 4.0

$ 11.0

$ 4.0

$ 11.0

$ 0.0

[1]

Included in the carrying value of the hedged assets/(liabilities).(2)As of June 30, 2023, included portfolio layer method derivative instruments with $3.5 billion designated as the hedged amount (from a closed portfolio of prepayable fixed rate loans with a carrying value of $6.8 billion). The cumulative basis adjustment included in the carrying value of these hedged items totaled $29 million.

Earnings per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Earnings Per Share [Abstract]
Basic	108,300	107,300	108,200	106,700
Weighted Average Number Diluted Shares Outstanding Adjustment	0	400	100	400
Diluted	108,300	107,700	108,300	107,100
Net income available to common shareholders	$ 212,500	$ 257,000	$ 351,500	$ 493,900
Earnings (loss) per share - basic	$ 1.96	$ 2.40	$ 3.25	$ 4.63
Earnings (loss) per share - diluted	$ 1.96	$ 2.39	$ 3.24	$ 4.61
Restricted Stock [Member]
Earnings Per Share [Abstract]
Anti-dilutive stock options outstanding that were not included in computation of diluted earnings per common share	400		200
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Anti-dilutive stock options outstanding that were not included in computation of diluted earnings per common share	400		200

Income Taxes Additional Information (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022	Dec. 31, 2022
Operating Loss Carryforwards [Line Items]
Effective Income Tax Rate Reconciliation, Percent	17.10%	19.60%	19.50%	19.50%
Deferred Income Tax Assets, Net	$ 315,000		$ 315,000		$ 311,000
Investments in LIHTC and renewable energy	596,000		596,000		624,000
Investment-related Liabilities	338,000		338,000		398,000
Amortization of tax credit investments	27,700	$ 15,400	39,000	$ 28,800
Deferred Tax Assets, Valuation Allowance	$ 0		$ 0		$ 0

Commitments and Contingencies - Additional Information (Detail) - USD ($) $ in Millions	6 Months Ended	12 Months Ended
	Jun. 30, 2023	Dec. 31, 2022	Mar. 31, 2023	Jun. 30, 2022	Mar. 31, 2022	Dec. 31, 2021
Loss Contingencies [Line Items]
Letters of credit expiration period	1 year
Off-Balance Sheet, Credit Loss, Liability	$ 41.1	$ 47.0	$ 44.8	$ 53.8	$ 43.3	$ 37.6
Commercial Real Estate Portfolio Segment [Member] \| Loans Receivable [Member] \| Credit Concentration Risk [Member]
Loss Contingencies [Line Items]
Percent of commercial real estate related loans	21.00%	18.00%
Commercial and Industrial Sector [Member] \| Loans Receivable [Member] \| Credit Concentration Risk [Member]
Loss Contingencies [Line Items]
Percent of commercial real estate related loans	35.00%	40.00%
Unfunded Loan Commitment [Member]
Loss Contingencies [Line Items]
Loss Contingency Accrual	$ 41.0	$ 47.0

Commitments and Contingencies - Summary of Contractual Amounts for Unfunded Commitments and Letters of Credit (Detail) - USD ($) $ in Millions	6 Months Ended	12 Months Ended
	Jun. 30, 2023	Dec. 31, 2022
Other Commitments [Line Items]
Total amount	$ 15,964	$ 19,318
Commitments to extend credit [Member]
Other Commitments [Line Items]
Unsecured Loan Commitments	1,168	1,209
Total amount	15,319	18,674
Credit card guarantees [Member]
Other Commitments [Line Items]
Total amount	405	379
Standby letters of credit [Member]
Other Commitments [Line Items]
Total amount	240	265
Unsecured Letters Of Credit	$ 6	$ 7
Commercial Real Estate Portfolio Segment [Member] \| Credit Concentration Risk [Member] \| Loans Receivable [Member]
Other Commitments [Line Items]
Concentration Risk, Percentage	21.00%	18.00%
Construction And Land Development Land [Member] \| Credit Concentration Risk [Member] \| Loans Receivable [Member]
Other Commitments [Line Items]
Concentration Risk, Percentage	9.00%	8.00%

Commitments and Contingencies Lease Commitments (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Commitments and Contingencies Disclosure [Abstract]
Lease, Cost	$ 7.1	$ 6.2	$ 14.5	$ 12.1
Lessee, operating lease, other cost	1.2	1.0	2.5	2.1
Other Commitments [Line Items]
Lease, Cost	7.1	6.2	14.5	12.1
Lessee, operating lease, other cost	$ 1.2	$ 1.0	$ 2.5	$ 2.1

Fair Value Accounting - Gains and Losses from Fair Value Changes Included in Consolidated Statement of Operations (Detail)
$ in Millions

3 Months Ended

6 Months Ended

Jun. 30, 2023

USD ($)

Jun. 30, 2022

USD ($)

Jun. 30, 2023

USD ($)

Jun. 30, 2022

USD ($)

Dec. 31, 2022

USD ($)

Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]

Subordinated Debt Obligations, Fair Value Disclosure

$ 57.0

^[1]

$ 57.0

^[1]

$ 63.0

Other Comprehensive Income (Loss), Financial Liability, Fair Value Option, Unrealized Gain (Loss) Arising During Period, after Tax

$ (5.0)

$ 2.0

$ 3.9

$ 4.2

Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]

Debt Instrument, Measurement Input

0.1013

0.0813

Fair Value, Liability, Recurring Basis, Still Held, Unrealized Gain (Loss)

$ 6.7

2.7

$ 5.2

5.6

Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Gain (Loss) Included in Other Comprehensive Income (Loss)

^[2]

$ 6.7

$ (2.7)

$ 5.2

$ (5.6)

Period of basis point spread

4.58%

3.36%

Percentage of LIBOR

5.55%

4.77%

[1]

The fair value of assets and liabilities measured at fair value on a recurring basis was determined using the following inputs:


	Fair Value Measurements at the End of the Reporting Period Using:
	Quoted Prices in Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)		Fair Value
June 30, 2023	(in millions)

Assets:




Available-for-sale debt securities
CLO	$	—	$	2,144	$	—	$	2,144
Commercial MBS issued by GSEs	—		60		—		60
Corporate debt securities	—		338		—		338
Private label residential MBS	—		1,141		—		1,141
Residential MBS issued by GSEs	—		1,765		—		1,765
Tax-exempt	—		830		—		830

U.S. Treasury securities	2,286		—		—		2,286
Other	27		40		—		67
Total AFS debt securities	$	2,313	$	6,318	$	—	$	8,631
Equity securities
Common stock	$	2	$	—	$	—	$	2
CRA investments	25		12		—		37
Preferred stock	95		5		—		100
Total equity securities	$	122	$	17	$	—	$	139
Loans HFS (2)	$	—	$	1,337	$	3	$	1,340
MSRs	—		—		1,007		1,007
Derivative assets (1)	—		98		6		104
Liabilities:
Junior subordinated debt (3)	$	—	$	—	$	57	$	57
Derivative liabilities (1)	—		37		4		41

(1)See "Note 11. Derivatives and Hedging Activities." In addition, the carrying value of loans is decreased by $52 million as of June 30, 2023 for the effective portion of the hedge, which relates to the fair value of the hedges put in place to mitigate against fluctuations in interest rates. Derivative assets and liabilities exclude margin of $85 million and $12 million, respectively.

(2)Includes only the portion of loans HFS that is recorded at fair value at each reporting period pursuant to the election of FVO treatment.

(3)Includes only the portion of junior subordinated debt that is recorded at fair value at each reporting period pursuant to the election of FVO treatment.


	Fair Value Measurements at the End of the Reporting Period Using:
	Quoted Prices in Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)		Fair Value
December 31, 2022	(in millions)

Assets:




Available-for-sale debt securities
CLO	$	—	$	2,706	$	—	$	2,706
Commercial MBS issued by GSEs	—		97		—		97
Corporate debt securities	—		390		—		390
Private label residential MBS	—		1,199		—		1,199
Residential MBS issued by GSEs	—		1,740		—		1,740
Tax-exempt	—		891		—		891


Other	24		45		—		69
Total AFS debt securities	$	24	$	7,068	$	—	$	7,092
Equity securities
Common stock	$	3	$	—	$	—	$	3
CRA investments	24		25		—		49
Preferred stock	108		—		—		108
Total equity securities	$	135	$	25	$	—	$	160
Loans - HFS (2)	$	—	$	1,172	$	1	$	1,173
Mortgage servicing rights	—		—		1,148		1,148
Derivative assets (1)	—		42		5		47
Liabilities:
Junior subordinated debt (3)	$	—	$	—	$	63	$	63
Derivative liabilities (1)	—		36		3		39

(1)See "Note 11. Derivatives and Hedging Activities." In addition, the carrying value of loans is decreased by $17 million as of December 31, 2022 for the effective portion of the hedge, which relates to the fair value of the hedges put in place to mitigate against fluctuations in interest rates. Derivative assets and liabilities exclude margin of $4 million and $1 million, respectively.

(2)Includes only the portion of loans HFS that is recorded at fair value at each reporting period pursuant to the election of FVO treatment.

(3)Includes only the portion of junior subordinated debt that is recorded at fair value at each reporting period pursuant to the election of FVO treatment.

[2]

Unrealized gains attributable to changes in the fair value of junior subordinated debt are recorded in OCI, net of tax, and totaled $5.0 million and $2.0 million for three months ended June 30, 2023 and 2022, respectively, and $3.9 million and $4.2 million for the six months ended June 30, 2023 and 2022, respectively.

Fair Value Accounting - Fair Value of Assets and Liabilities (Detail)
$ in Millions

3 Months Ended

6 Months Ended

Jun. 30, 2023

USD ($)

percent

Jun. 30, 2022

USD ($)

Jun. 30, 2023

USD ($)

percent

Jun. 30, 2022

USD ($)

Mar. 31, 2023

USD ($)

Dec. 31, 2022

USD ($)

percent

Mar. 31, 2022

USD ($)

Dec. 31, 2021

USD ($)

Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]

Subordinated Debt Obligations, Fair Value Disclosure

$ 139.0

^[1]

$ 139.0

^[1]

$ 160.0

^[2]

57.0

^[3]

57.0

^[3]

63.0

Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]

$ 1,007.0

$ 826.0

$ 1,007.0

$ 826.0

$ 910.0

$ 1,148.0

$ 950.0

$ 698.0

Minimum | Recapture Rate

Minimum | Conditional Prepayment Rate

0.200

Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]

Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]

0.091

0.085

Maximum | Recapture Rate

Maximum | Conditional Prepayment Rate

0.200

Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]

Weighted Average | Recapture Rate

0.209

0.185

Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]

Weighted Average | Conditional Prepayment Rate

20.0

0.200

Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]

Fair Value, Recurring [Member]

15.3

13.4

Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]

$ 139.0

$ 160.0

Largest gross exposure (positive derivative NPV) to an individual counterparty

41.0

^[4]

41.0

^[4]

39.0

104.0

^[4]

104.0

^[4]

47.0

1,340.0

1,173.0

Fair Value, Recurring [Member] | Level 1 [Member]

1,007.0

1,148.0

Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]

Subordinated Debt Obligations, Fair Value Disclosure

122.0

135.0

0.0

^[3]

0.0

^[3]

0.0

Largest gross exposure (positive derivative NPV) to an individual counterparty

0.0

^[4]

0.0

^[4]

0.0

0.0

^[4]

0.0

^[4]

0.0

0.0

Fair Value, Recurring [Member] | Level 2 [Member]

0.0

Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]

Subordinated Debt Obligations, Fair Value Disclosure

17.0

25.0

0.0

^[3]

0.0

^[3]

0.0

Largest gross exposure (positive derivative NPV) to an individual counterparty

37.0

^[4]

37.0

^[4]

36.0

98.0

^[4]

98.0

^[4]

42.0

1,337.0

1,172.0

0.0

Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]

Subordinated Debt Obligations, Fair Value Disclosure

0.0

57.0

^[3]

57.0

^[3]

63.0

Largest gross exposure (positive derivative NPV) to an individual counterparty

4.0

^[4]

4.0

^[4]

3.0

6.0

^[4]

6.0

^[4]

5.0

3.0

1.0

Reported Value Measurement [Member] | Fair Value, Recurring [Member]

1,007.0

1,148.0

Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]

139.0

160.0

Largest gross exposure (positive derivative NPV) to an individual counterparty

41.0

40.0

104.0

51.0

Estimate of Fair Value Measurement [Member] | Fair Value, Recurring [Member]

Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]

139.0

160.0

Largest gross exposure (positive derivative NPV) to an individual counterparty

41.0

39.0

104.0

47.0

Estimate of Fair Value Measurement [Member] | Fair Value, Recurring [Member] | Level 1 [Member]

Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]

122.0

135.0

Largest gross exposure (positive derivative NPV) to an individual counterparty

0.0

0.0

Estimate of Fair Value Measurement [Member] | Fair Value, Recurring [Member] | Level 2 [Member]

Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]

17.0

25.0

Largest gross exposure (positive derivative NPV) to an individual counterparty

37.0

36.0

98.0

42.0

Estimate of Fair Value Measurement [Member] | Fair Value, Recurring [Member] | Level 3 [Member]

Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]

0.0

Largest gross exposure (positive derivative NPV) to an individual counterparty

4.0

3.0

6.0

5.0

Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]

Fair Value, Liability, Recurring Basis, Still Held, Unrealized Gain (Loss)

6.7

2.7

5.2

5.6

Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Gain (Loss) Included in Other Comprehensive Income (Loss)

^[5]

6.7

$ (2.7)

5.2

$ (5.6)

Junior Subordinated Debt [Member] | Level 3 [Member]

Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]

Subordinated Debt Obligations, Fair Value Disclosure

$ 57.0

$ 63.0

[1]

ratings differ, the Company uses an average of the available ratings by major credit agencies.

[2]

For rated securities, if ratings differ, the Company uses an average of the available ratings by major credit agencies.

[3]

The fair value of assets and liabilities measured at fair value on a recurring basis was determined using the following inputs:


	Fair Value Measurements at the End of the Reporting Period Using:
	Quoted Prices in Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)		Fair Value
June 30, 2023	(in millions)

Assets:




Available-for-sale debt securities
CLO	$	—	$	2,144	$	—	$	2,144
Commercial MBS issued by GSEs	—		60		—		60
Corporate debt securities	—		338		—		338
Private label residential MBS	—		1,141		—		1,141
Residential MBS issued by GSEs	—		1,765		—		1,765
Tax-exempt	—		830		—		830

U.S. Treasury securities	2,286		—		—		2,286
Other	27		40		—		67
Total AFS debt securities	$	2,313	$	6,318	$	—	$	8,631
Equity securities
Common stock	$	2	$	—	$	—	$	2
CRA investments	25		12		—		37
Preferred stock	95		5		—		100
Total equity securities	$	122	$	17	$	—	$	139
Loans HFS (2)	$	—	$	1,337	$	3	$	1,340
MSRs	—		—		1,007		1,007
Derivative assets (1)	—		98		6		104
Liabilities:
Junior subordinated debt (3)	$	—	$	—	$	57	$	57
Derivative liabilities (1)	—		37		4		41

(1)See "Note 11. Derivatives and Hedging Activities." In addition, the carrying value of loans is decreased by $52 million as of June 30, 2023 for the effective portion of the hedge, which relates to the fair value of the hedges put in place to mitigate against fluctuations in interest rates. Derivative assets and liabilities exclude margin of $85 million and $12 million, respectively.

(2)Includes only the portion of loans HFS that is recorded at fair value at each reporting period pursuant to the election of FVO treatment.

(3)Includes only the portion of junior subordinated debt that is recorded at fair value at each reporting period pursuant to the election of FVO treatment.


	Fair Value Measurements at the End of the Reporting Period Using:
	Quoted Prices in Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)		Fair Value
December 31, 2022	(in millions)

Assets:




Available-for-sale debt securities
CLO	$	—	$	2,706	$	—	$	2,706
Commercial MBS issued by GSEs	—		97		—		97
Corporate debt securities	—		390		—		390
Private label residential MBS	—		1,199		—		1,199
Residential MBS issued by GSEs	—		1,740		—		1,740
Tax-exempt	—		891		—		891


Other	24		45		—		69
Total AFS debt securities	$	24	$	7,068	$	—	$	7,092
Equity securities
Common stock	$	3	$	—	$	—	$	3
CRA investments	24		25		—		49
Preferred stock	108		—		—		108
Total equity securities	$	135	$	25	$	—	$	160
Loans - HFS (2)	$	—	$	1,172	$	1	$	1,173
Mortgage servicing rights	—		—		1,148		1,148
Derivative assets (1)	—		42		5		47
Liabilities:
Junior subordinated debt (3)	$	—	$	—	$	63	$	63
Derivative liabilities (1)	—		36		3		39

(1)See "Note 11. Derivatives and Hedging Activities." In addition, the carrying value of loans is decreased by $17 million as of December 31, 2022 for the effective portion of the hedge, which relates to the fair value of the hedges put in place to mitigate against fluctuations in interest rates. Derivative assets and liabilities exclude margin of $4 million and $1 million, respectively.

(2)Includes only the portion of loans HFS that is recorded at fair value at each reporting period pursuant to the election of FVO treatment.

(3)Includes only the portion of junior subordinated debt that is recorded at fair value at each reporting period pursuant to the election of FVO treatment.

[4]

See "Note 11. Derivatives and Hedging Activities." In addition, the carrying value of loans is decreased by $52 million as of June 30, 2023 for the effective portion of the hedge, which relates to the fair value of the hedges put in place to mitigate against fluctuations in interest rates. Derivative assets and liabilities exclude margin of $85 million and $12 million, respectively.

[5]

Unrealized gains attributable to changes in the fair value of junior subordinated debt are recorded in OCI, net of tax, and totaled $5.0 million and $2.0 million for three months ended June 30, 2023 and 2022, respectively, and $3.9 million and $4.2 million for the six months ended June 30, 2023 and 2022, respectively.

Fair Value Accounting - Change in Level 3 Liabilities Measured at Fair Value on Recurring Basis (Detail)
$ in Millions

3 Months Ended

6 Months Ended

Jun. 30, 2023

USD ($)

Jun. 30, 2022

USD ($)

Jun. 30, 2023

USD ($)

Jun. 30, 2022

USD ($)

Mar. 31, 2023

USD ($)

Dec. 31, 2022

USD ($)

Mar. 31, 2022

USD ($)

Dec. 31, 2021

USD ($)

Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]

Other Comprehensive Income (Loss), Financial Liability, Fair Value Option, Unrealized Gain (Loss) Arising During Period, after Tax

$ (5.0)

$ 2.0

$ 3.9

$ 4.2

Servicing Asset at Fair Value, Other Changes that Affect Balance

57.0

^[1]

57.0

^[1]

$ 63.0

1.0

0.0

4.0

0.0

Interest Rate Lock Commitments

Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]

Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value

2.0

12.0

2.0

12.0

$ 14.0

2.0

$ (11.0)

$ 9.0

Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases

4,210.0

5,575.0

7,156.0

10,898.0

Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Issuances

(4,219.0)

(5,543.0)

(7,154.0)

(10,864.0)

Fair Value, Asset (Liability), Recurring Basis, Still Held, Unrealized Gain (Loss)

2.0

12.0

2.0

12.0

Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings

(3.0)

(9.0)

(2.0)

(31.0)

Servicing Contracts

Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]

Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value

1,007.0

826.0

1,007.0

826.0

$ 910.0

1,148.0

$ 950.0

$ 698.0

Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases

245.0

194.0

387.0

398.0

Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Sales

(149.0)

(350.0)

(499.0)

(350.0)

Fair Value, Asset (Liability), Recurring Basis, Still Held, Unrealized Gain (Loss)

31.0

40.0

31.0

89.0

Realization of expected cash flows

(24.0)

(30.0)

(49.0)

(63.0)

Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings

24.0

62.0

16.0

143.0

Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]

57.0

^[1]

57.0

^[1]

$ 63.0

Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]

Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Gain (Loss) Included in Other Comprehensive Income (Loss)

^[2]

$ (6.7)

2.7

$ (5.2)

5.6

Debt Instrument, Measurement Input

0.1013

0.0813

Junior Subordinated Debt [Member] | Level 3 [Member]

Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]

Junior Subordinated Debt [Member] | Fair Value, Recurring [Member]

$ 57.0

$ 63.0

Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]

Beginning balance

64.0

64.5

62.5

67.4

Closing balance

$ 57.3

$ 61.8

$ 57.3

$ 61.8

[1]

The fair value of assets and liabilities measured at fair value on a recurring basis was determined using the following inputs:


	Fair Value Measurements at the End of the Reporting Period Using:
	Quoted Prices in Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)		Fair Value
June 30, 2023	(in millions)

Assets:




Available-for-sale debt securities
CLO	$	—	$	2,144	$	—	$	2,144
Commercial MBS issued by GSEs	—		60		—		60
Corporate debt securities	—		338		—		338
Private label residential MBS	—		1,141		—		1,141
Residential MBS issued by GSEs	—		1,765		—		1,765
Tax-exempt	—		830		—		830

U.S. Treasury securities	2,286		—		—		2,286
Other	27		40		—		67
Total AFS debt securities	$	2,313	$	6,318	$	—	$	8,631
Equity securities
Common stock	$	2	$	—	$	—	$	2
CRA investments	25		12		—		37
Preferred stock	95		5		—		100
Total equity securities	$	122	$	17	$	—	$	139
Loans HFS (2)	$	—	$	1,337	$	3	$	1,340
MSRs	—		—		1,007		1,007
Derivative assets (1)	—		98		6		104
Liabilities:
Junior subordinated debt (3)	$	—	$	—	$	57	$	57
Derivative liabilities (1)	—		37		4		41

(1)See "Note 11. Derivatives and Hedging Activities." In addition, the carrying value of loans is decreased by $52 million as of June 30, 2023 for the effective portion of the hedge, which relates to the fair value of the hedges put in place to mitigate against fluctuations in interest rates. Derivative assets and liabilities exclude margin of $85 million and $12 million, respectively.

(2)Includes only the portion of loans HFS that is recorded at fair value at each reporting period pursuant to the election of FVO treatment.

(3)Includes only the portion of junior subordinated debt that is recorded at fair value at each reporting period pursuant to the election of FVO treatment.


	Fair Value Measurements at the End of the Reporting Period Using:
	Quoted Prices in Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)		Fair Value
December 31, 2022	(in millions)

Assets:




Available-for-sale debt securities
CLO	$	—	$	2,706	$	—	$	2,706
Commercial MBS issued by GSEs	—		97		—		97
Corporate debt securities	—		390		—		390
Private label residential MBS	—		1,199		—		1,199
Residential MBS issued by GSEs	—		1,740		—		1,740
Tax-exempt	—		891		—		891


Other	24		45		—		69
Total AFS debt securities	$	24	$	7,068	$	—	$	7,092
Equity securities
Common stock	$	3	$	—	$	—	$	3
CRA investments	24		25		—		49
Preferred stock	108		—		—		108
Total equity securities	$	135	$	25	$	—	$	160
Loans - HFS (2)	$	—	$	1,172	$	1	$	1,173
Mortgage servicing rights	—		—		1,148		1,148
Derivative assets (1)	—		42		5		47
Liabilities:
Junior subordinated debt (3)	$	—	$	—	$	63	$	63
Derivative liabilities (1)	—		36		3		39

(1)See "Note 11. Derivatives and Hedging Activities." In addition, the carrying value of loans is decreased by $17 million as of December 31, 2022 for the effective portion of the hedge, which relates to the fair value of the hedges put in place to mitigate against fluctuations in interest rates. Derivative assets and liabilities exclude margin of $4 million and $1 million, respectively.

(2)Includes only the portion of loans HFS that is recorded at fair value at each reporting period pursuant to the election of FVO treatment.

(3)Includes only the portion of junior subordinated debt that is recorded at fair value at each reporting period pursuant to the election of FVO treatment.

[2]

Unrealized gains attributable to changes in the fair value of junior subordinated debt are recorded in OCI, net of tax, and totaled $5.0 million and $2.0 million for three months ended June 30, 2023 and 2022, respectively, and $3.9 million and $4.2 million for the six months ended June 30, 2023 and 2022, respectively.

Fair Value Accounting - Assets Measured at Fair Value on Nonrecurring Basis (Detail) - USD ($) $ in Millions	6 Months Ended	12 Months Ended
	Jun. 30, 2023	Dec. 31, 2022
Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Impaired loans with an allowance recorded	$ 9	$ 7
Fair Value, Nonrecurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Other assets acquired through foreclosure	11	11
Collateral Dependent Loans, Net of Allowance	368	295
Fair Value, Nonrecurring [Member] \| Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Other assets acquired through foreclosure	0	0
Collateral Dependent Loans, Net of Allowance	0	0
Fair Value, Nonrecurring [Member] \| Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Other assets acquired through foreclosure	0	0
Collateral Dependent Loans, Net of Allowance	0	0
Fair Value, Nonrecurring [Member] \| Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Other assets acquired through foreclosure	11	11
Collateral Dependent Loans, Net of Allowance	$ 368	$ 295
Third Party Appraisal [Member] \| Loans and Finance Receivables [Member] \| Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Level 3 Fair Value Measurement Inputs	Costs to sell	Costs to sell
Third Party Appraisal [Member] \| Other Assets [Member] \| Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Level 3 Fair Value Measurement Inputs	Costs to sell	Costs to sell
Discount Rate [Member] \| Loans and Finance Receivables [Member] \| Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Level 3 Fair Value Measurement Inputs	Contractual loan rate	Contractual loan rate
Scheduled Cash Collections [Member] \| Loans and Finance Receivables [Member] \| Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Level 3 Fair Value Measurement Inputs	Probability of default	Probability of default
Proceeds from Non-Real Estate Collateral [Member] \| Loans and Finance Receivables [Member] \| Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Level 3 Fair Value Measurement Inputs	Loss given default	Loss given default

Fair Value Accounting - Change in Level 3 Unobservable Inputs (Detail) $ in Millions	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2023 USD ($) percent	Jun. 30, 2022 USD ($)	Jun. 30, 2023 USD ($) percent	Jun. 30, 2022 USD ($)	Dec. 31, 2022 USD ($) percent	Mar. 31, 2023 USD ($)	Mar. 31, 2022 USD ($)	Dec. 31, 2021 USD ($)
Interest Rate Lock Commitments
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value \| $	$ 2.0	$ 12.0	$ 2.0	$ 12.0	$ 2.0	$ 14.0	$ (11.0)	$ 9.0
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases \| $	4,210.0	5,575.0	7,156.0	10,898.0
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Issuances \| $	(4,219.0)	(5,543.0)	(7,154.0)	(10,864.0)
Fair Value, Asset (Liability), Recurring Basis, Still Held, Unrealized Gain (Loss) \| $	2.0	12.0	2.0	12.0
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings \| $	(3.0)	(9.0)	(2.0)	(31.0)
Servicing Contracts
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value \| $	1,007.0	826.0	1,007.0	826.0	$ 1,148.0	$ 910.0	$ 950.0	$ 698.0
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases \| $	245.0	194.0	387.0	398.0
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Sales \| $	(149.0)	(350.0)	(499.0)	(350.0)
Fair Value, Asset (Liability), Recurring Basis, Still Held, Unrealized Gain (Loss) \| $	31.0	40.0	31.0	89.0
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings \| $	24.0	62.0	16.0	143.0
Realization of expected cash flows \| $	$ (24.0)	$ (30.0)	$ (49.0)	$ (63.0)
Loans and Finance Receivables [Member] \| Level 3 [Member] \| Scheduled Cash Collections [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Level 3 Fair Value Measurement Inputs			Probability of default		Probability of default
Loans and Finance Receivables [Member] \| Level 3 [Member] \| Proceeds from Non-Real Estate Collateral [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Level 3 Fair Value Measurement Inputs			Loss given default		Loss given default
Option Adjusted Spread \| Maximum
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Servicing Asset, Measurement Input	307		307		621
Option Adjusted Spread \| Weighted Average
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Servicing Asset, Measurement Input	237		237		378
Option Adjusted Spread \| Minimum
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Servicing Asset, Measurement Input	48		48		190
Conditional Prepayment Rate \| Maximum
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Servicing Asset, Measurement Input	0.209		0.209		0.185
Conditional Prepayment Rate \| Weighted Average
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Servicing Asset, Measurement Input	15.3		15.3		13.4
Conditional Prepayment Rate \| Minimum
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Servicing Asset, Measurement Input	0.091		0.091		0.085
Servicing Fee Rate \| Maximum
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Servicing Asset, Measurement Input	56.5		56.5		56.5
Servicing Fee Rate \| Weighted Average
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Servicing Asset, Measurement Input	34.6		34.6		33.2
Servicing Fee Rate \| Minimum
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Servicing Asset, Measurement Input	25.0		25.0		25.0
Cost to Service \| Maximum
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Servicing Asset, Measurement Input	100		100		94
Cost to Service \| Weighted Average
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Servicing Asset, Measurement Input	94		94		90
Cost to Service \| Minimum
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Servicing Asset, Measurement Input	93		93		87
Servicing Fee Multiple \| Maximum
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative Asset, Measurement Input	5.3		5.3		5.5
Servicing Fee Multiple \| Weighted Average
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative Asset, Measurement Input	4.3		4.3		4.3
Servicing Fee Multiple \| Minimum
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative Asset, Measurement Input	3.3		3.3		2.9
Pull-through Rate \| Maximum
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative Asset, Measurement Input	1		1		1
Pull-through Rate \| Weighted Average
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative Asset, Measurement Input	89		89		89
Pull-through Rate \| Minimum
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative Asset, Measurement Input	0.71		0.71		0.69
Recapture Rate \| Maximum
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Servicing Asset, Measurement Input	0.200		0.200		0.200
Recapture Rate \| Weighted Average
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Servicing Asset, Measurement Input	20.0		20.0		0.200
Recapture Rate \| Minimum
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Servicing Asset, Measurement Input	0.200		0.200		0.200

Fair Value Accounting - Estimated Fair Value of Financial Instruments (Detail) - USD ($)
$ in Millions

Jun. 30, 2023

Dec. 31, 2022

Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]

Other Repossessed Assets

$ 11

1,367

1,289

8,631

^[1]

7,092

^[2]

139

^[1]

160

^[2]

47,554

51,552

3,156

1,184

1,007

1,148

4

51,041

53,644

9,567

6,299

Fair Value, Nonrecurring [Member]

57

^[3]

63

Fair Value, Nonrecurring [Member] | Level 1 [Member]

11

Fair Value, Nonrecurring [Member] | Level 2 [Member]

0

Fair Value, Nonrecurring [Member] | Level 3 [Member]

0

Fair Value, Nonrecurring [Member] | Reported Value Measurement [Member]

11

1,367

1,289

47,554

51,552

348

357

51,041

53,644

9,567

6,299

888

893

Fair Value, Nonrecurring [Member] | Estimate of Fair Value Measurement [Member]

104

35

1,186

1,112

44,772

47,679

348

357

51,040

53,698

9,490

6,261

689

810

Fair Value, Nonrecurring [Member] | Estimate of Fair Value Measurement [Member] | Level 1 [Member]

104

35

0

0

0

0

0

0

Fair Value, Nonrecurring [Member] | Estimate of Fair Value Measurement [Member] | Level 2 [Member]

0

1,186

1,112

0

348

357

51,040

53,698

9,490

6,261

620

735

Fair Value, Nonrecurring [Member] | Estimate of Fair Value Measurement [Member] | Level 3 [Member]

104

35

0

44,772

47,679

0

0

0

69

75

Fair Value, Recurring [Member]

0

8,631

7,092

139

160

104

^[4]

47

Fair Value, Recurring [Member] | Level 1 [Member]

41

^[4]

39

2,313

24

122

135

0

^[4]

0

0

^[3]

0

Fair Value, Recurring [Member] | Level 2 [Member]

0

^[4]

0

6,318

7,068

17

25

98

^[4]

42

0

^[3]

0

37

^[4]

36

0

0

6

^[4]

5

57

^[3]

63

Fair Value, Recurring [Member] | Reported Value Measurement [Member]

4

^[4]

3

8,631

7,092

139

160

104

51

3,156

1,184

1,007

1,148

Fair Value, Recurring [Member] | Estimate of Fair Value Measurement [Member]

41

40

8,631

7,092

139

160

104

47

3,156

1,173

1,007

1,148

Fair Value, Recurring [Member] | Estimate of Fair Value Measurement [Member] | Level 1 [Member]

41

39

2,313

24

122

135

0

0

0

Fair Value, Recurring [Member] | Estimate of Fair Value Measurement [Member] | Level 2 [Member]

0

6,318

7,068

17

25

98

42

3,136

1,172

0

Fair Value, Recurring [Member] | Estimate of Fair Value Measurement [Member] | Level 3 [Member]

37

36

0

0

6

5

20

1

1,007

1,148

Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]

$ 4

$ 3

[1]

ratings differ, the Company uses an average of the available ratings by major credit agencies.

[2]

For rated securities, if ratings differ, the Company uses an average of the available ratings by major credit agencies.

[3]

The fair value of assets and liabilities measured at fair value on a recurring basis was determined using the following inputs:


	Fair Value Measurements at the End of the Reporting Period Using:
	Quoted Prices in Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)		Fair Value
June 30, 2023	(in millions)

Assets:




Available-for-sale debt securities
CLO	$	—	$	2,144	$	—	$	2,144
Commercial MBS issued by GSEs	—		60		—		60
Corporate debt securities	—		338		—		338
Private label residential MBS	—		1,141		—		1,141
Residential MBS issued by GSEs	—		1,765		—		1,765
Tax-exempt	—		830		—		830

U.S. Treasury securities	2,286		—		—		2,286
Other	27		40		—		67
Total AFS debt securities	$	2,313	$	6,318	$	—	$	8,631
Equity securities
Common stock	$	2	$	—	$	—	$	2
CRA investments	25		12		—		37
Preferred stock	95		5		—		100
Total equity securities	$	122	$	17	$	—	$	139
Loans HFS (2)	$	—	$	1,337	$	3	$	1,340
MSRs	—		—		1,007		1,007
Derivative assets (1)	—		98		6		104
Liabilities:
Junior subordinated debt (3)	$	—	$	—	$	57	$	57
Derivative liabilities (1)	—		37		4		41

(1)See "Note 11. Derivatives and Hedging Activities." In addition, the carrying value of loans is decreased by $52 million as of June 30, 2023 for the effective portion of the hedge, which relates to the fair value of the hedges put in place to mitigate against fluctuations in interest rates. Derivative assets and liabilities exclude margin of $85 million and $12 million, respectively.

(2)Includes only the portion of loans HFS that is recorded at fair value at each reporting period pursuant to the election of FVO treatment.

(3)Includes only the portion of junior subordinated debt that is recorded at fair value at each reporting period pursuant to the election of FVO treatment.


	Fair Value Measurements at the End of the Reporting Period Using:
	Quoted Prices in Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)		Fair Value
December 31, 2022	(in millions)

Assets:




Available-for-sale debt securities
CLO	$	—	$	2,706	$	—	$	2,706
Commercial MBS issued by GSEs	—		97		—		97
Corporate debt securities	—		390		—		390
Private label residential MBS	—		1,199		—		1,199
Residential MBS issued by GSEs	—		1,740		—		1,740
Tax-exempt	—		891		—		891


Other	24		45		—		69
Total AFS debt securities	$	24	$	7,068	$	—	$	7,092
Equity securities
Common stock	$	3	$	—	$	—	$	3
CRA investments	24		25		—		49
Preferred stock	108		—		—		108
Total equity securities	$	135	$	25	$	—	$	160
Loans - HFS (2)	$	—	$	1,172	$	1	$	1,173
Mortgage servicing rights	—		—		1,148		1,148
Derivative assets (1)	—		42		5		47
Liabilities:
Junior subordinated debt (3)	$	—	$	—	$	63	$	63
Derivative liabilities (1)	—		36		3		39

(1)See "Note 11. Derivatives and Hedging Activities." In addition, the carrying value of loans is decreased by $17 million as of December 31, 2022 for the effective portion of the hedge, which relates to the fair value of the hedges put in place to mitigate against fluctuations in interest rates. Derivative assets and liabilities exclude margin of $4 million and $1 million, respectively.

(2)Includes only the portion of loans HFS that is recorded at fair value at each reporting period pursuant to the election of FVO treatment.

(3)Includes only the portion of junior subordinated debt that is recorded at fair value at each reporting period pursuant to the election of FVO treatment.

[4]

See "Note 11. Derivatives and Hedging Activities." In addition, the carrying value of loans is decreased by $52 million as of June 30, 2023 for the effective portion of the hedge, which relates to the fair value of the hedges put in place to mitigate against fluctuations in interest rates. Derivative assets and liabilities exclude margin of $85 million and $12 million, respectively.

Fair Value Accounting - Additional Information (Detail)
$ in Millions

6 Months Ended

Jun. 30, 2023

USD ($)

percent

shares

Jun. 30, 2022

USD ($)

Mar. 31, 2023

USD ($)

Dec. 31, 2022

USD ($)

percent

shares

Mar. 31, 2022

USD ($)

Jan. 25, 2022

USD ($)

Dec. 31, 2021

USD ($)

Apr. 07, 2021

USD ($)

Common Stock, Shares, Issued | shares

$ 11.0

Goodwill

$ 36.6

$ 199.8

112,211,949

111,465,292

Financing Receivable, 90 Days or More Past Due, Still Accruing

$ 1,340.0

$ 1,173.0

1.0

Fair Value, Option, Loans Held as Assets, Aggregate Difference

27.0

34.0

Fair Value, Option, Loans Held as Assets, 90 Days or More Past Due, Aggregate Difference

(1.0)

0.0

UPB, Option, Loans Held as Assets, Current Through 89 Days

1,311.0

1,138.0

Fair Value, Option, Loans Held as Assets, Current Through 89 days, Aggregate Difference

28.0

34.0

UPB, Option, Loans Held as Assets, 90 Days or More Past Due

2.0

1.0

139.0

^[1]

160.0

^[2]

Fair Value, Option, Loans Held as Assets, Current Through 89 Days

8,631.0

^[1]

7,092.0

^[2]

1,339.0

1,172.0

Minimum | Option Adjusted Spread

$ 1,007.0

$ 826.0

$ 910.0

$ 1,148.0

$ 950.0

$ 698.0

Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]

Minimum | Conditional Prepayment Rate

48

190

Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]

Minimum | Servicing Fee Rate

0.091

0.085

Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]

Minimum | Cost to Service

25.0

Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]

Minimum | Servicing Fee Multiple

93

87

Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]

Minimum | Pull-through Rate

3.3

2.9

Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]

Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]

0.71

0.69

Minimum | Recapture Rate

Maximum | Option Adjusted Spread

0.200

Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]

Maximum | Conditional Prepayment Rate

307

621

Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]

Maximum | Servicing Fee Rate

0.209

0.185

Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]

Maximum | Cost to Service

56.5

Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]

Maximum | Servicing Fee Multiple

100

94

Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]

Maximum | Pull-through Rate

5.3

5.5

Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]

Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]

1

Maximum | Recapture Rate

Weighted Average | Option Adjusted Spread

0.200

Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]

Weighted Average | Conditional Prepayment Rate

237

378

Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]

Weighted Average | Servicing Fee Rate

15.3

13.4

Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]

Weighted Average | Cost to Service

34.6

33.2

Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]

Weighted Average | Servicing Fee Multiple

94

90

Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]

Weighted Average | Pull-through Rate

4.3

Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]

Weighted Average | Recapture Rate

89

Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]

Collateralized Loan Obligations

20.0

0.200

Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]

Commercial Mortgage Backed Securities Issued By US Government Sponsored Enterprise [Member]

$ 2,144.0

$ 2,706.0

Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]

Corporate Bond Securities [Member]

60.0

97.0

Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]

Residential Mortgage Backed Securities [Member]

338.0

390.0

Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]

Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member]

1,141.0

1,199.0

Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]

Nontaxable Municipal Bonds [Member]

1,765.0

1,740.0

Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]

US Treasury Securities [Member]

830.0

891.0

Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]

Other Security Investments

2,286.0

Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]

Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]

67.0

69.0

CRA investments [Member]

37.0

49.0

Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]

Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]

100.0

108.0

Level 3 [Member]

Impaired loans with an allowance recorded

$ 9.0

7.0

Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]

Period of basis point spread

4.58%

3.36%

Percentage of LIBOR

5.55%

4.77%

Fair Value, Nonrecurring [Member]

Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]

$ 368.0

295.0

Fair Value, Nonrecurring [Member] | Level 3 [Member]

11.0

Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]

368.0

295.0

Fair Value, Nonrecurring [Member] | Level 2 [Member]

11.0

Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]

0.0

Fair Value, Nonrecurring [Member] | Level 1 [Member]

0.0

Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]

0.0

Fair Value, Recurring [Member]

0.0

Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]

Financing Receivable Unpaid Principal Balance

1,313.0

1,139.0

139.0

160.0

8,631.0

7,092.0

Fair Value, Recurring [Member] | Common Stock [Member]

1,007.0

1,148.0

Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]

Fair Value, Recurring [Member] | Collateralized Loan Obligations

2.0

3.0

Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]

Fair Value, Recurring [Member] | Commercial Mortgage Backed Securities Issued By US Government Sponsored Enterprise [Member]

2,144.0

2,706.0

Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]

Fair Value, Recurring [Member] | Corporate Bond Securities [Member]

60.0

97.0

Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]

Fair Value, Recurring [Member] | Residential Mortgage Backed Securities [Member]

338.0

390.0

Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]

Fair Value, Recurring [Member] | Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member]

1,141.0

1,199.0

Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]

Fair Value, Recurring [Member] | Nontaxable Municipal Bonds [Member]

1,765.0

1,740.0

Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]

Fair Value, Recurring [Member] | US Treasury Securities [Member]

830.0

891.0

Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]

Fair Value, Recurring [Member] | Other Security Investments

2,286.0

Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]

Fair Value, Recurring [Member] | CRA investments [Member]

67.0

69.0

Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]

Fair Value, Recurring [Member] | Preferred Stock [Member]

37.0

49.0

Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]

100.0

108.0

Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]

0.0

0.0

Fair Value, Recurring [Member] | Level 3 [Member] | Common Stock [Member]

1,007.0

1,148.0

Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]

Fair Value, Recurring [Member] | Level 3 [Member] | Collateralized Loan Obligations

0.0

Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]

Fair Value, Recurring [Member] | Level 3 [Member] | Commercial Mortgage Backed Securities Issued By US Government Sponsored Enterprise [Member]

0.0

Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]

Fair Value, Recurring [Member] | Level 3 [Member] | Corporate Bond Securities [Member]

0.0

Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]

Fair Value, Recurring [Member] | Level 3 [Member] | Residential Mortgage Backed Securities [Member]

0.0

Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]

Fair Value, Recurring [Member] | Level 3 [Member] | Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member]

0.0

Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]

Fair Value, Recurring [Member] | Level 3 [Member] | Nontaxable Municipal Bonds [Member]

0.0

Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]

Fair Value, Recurring [Member] | Level 3 [Member] | US Treasury Securities [Member]

0.0

Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]

Fair Value, Recurring [Member] | Level 3 [Member] | Other Security Investments

0.0

Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]

Fair Value, Recurring [Member] | Level 3 [Member] | CRA investments [Member]

0.0

Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]

Fair Value, Recurring [Member] | Level 3 [Member] | Preferred Stock [Member]

0.0

Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]

Fair Value, Recurring [Member] | Level 2 [Member]

0.0

Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]

17.0

25.0

6,318.0

7,068.0

Fair Value, Recurring [Member] | Level 2 [Member] | Common Stock [Member]

0.0

Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]

Fair Value, Recurring [Member] | Level 2 [Member] | Collateralized Loan Obligations

0.0

Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]

Fair Value, Recurring [Member] | Level 2 [Member] | Commercial Mortgage Backed Securities Issued By US Government Sponsored Enterprise [Member]

2,144.0

2,706.0

Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]

Fair Value, Recurring [Member] | Level 2 [Member] | Corporate Bond Securities [Member]

60.0

97.0

Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]

Fair Value, Recurring [Member] | Level 2 [Member] | Residential Mortgage Backed Securities [Member]

338.0

390.0

Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]

Fair Value, Recurring [Member] | Level 2 [Member] | Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member]

1,141.0

1,199.0

Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]

Fair Value, Recurring [Member] | Level 2 [Member] | Nontaxable Municipal Bonds [Member]

1,765.0

1,740.0

Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]

Fair Value, Recurring [Member] | Level 2 [Member] | US Treasury Securities [Member]

830.0

891.0

Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]

Fair Value, Recurring [Member] | Level 2 [Member] | Other Security Investments

0.0

Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]

Fair Value, Recurring [Member] | Level 2 [Member] | CRA investments [Member]

40.0

45.0

Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]

Fair Value, Recurring [Member] | Level 2 [Member] | Preferred Stock [Member]

12.0

25.0

Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]

Fair Value, Recurring [Member] | Level 1 [Member]

5.0

0.0

Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]

122.0

135.0

2,313.0

24.0

Fair Value, Recurring [Member] | Level 1 [Member] | Common Stock [Member]

0.0

Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]

Fair Value, Recurring [Member] | Level 1 [Member] | Collateralized Loan Obligations

2.0

3.0

Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]

Fair Value, Recurring [Member] | Level 1 [Member] | Commercial Mortgage Backed Securities Issued By US Government Sponsored Enterprise [Member]

0.0

Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]

Fair Value, Recurring [Member] | Level 1 [Member] | Corporate Bond Securities [Member]

0.0

Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]

Fair Value, Recurring [Member] | Level 1 [Member] | Residential Mortgage Backed Securities [Member]

0.0

Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]

Fair Value, Recurring [Member] | Level 1 [Member] | Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member]

0.0

Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]

Fair Value, Recurring [Member] | Level 1 [Member] | Nontaxable Municipal Bonds [Member]

0.0

Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]

Fair Value, Recurring [Member] | Level 1 [Member] | US Treasury Securities [Member]

0.0

Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]

Fair Value, Recurring [Member] | Level 1 [Member] | Other Security Investments

2,286.0

Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]

Fair Value, Recurring [Member] | Level 1 [Member] | CRA investments [Member]

27.0

24.0

Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]

Fair Value, Recurring [Member] | Level 1 [Member] | Preferred Stock [Member]

25.0

24.0

Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]

$ 95.0

$ 108.0

[1]	ratings differ, the Company uses an average of the available ratings by major credit agencies.
[2]	For rated securities, if ratings differ, the Company uses an average of the available ratings by major credit agencies.

Segments - Operating Segment Information (Detail) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022	Mar. 31, 2023	Dec. 31, 2022	Mar. 31, 2022	Dec. 31, 2021
Operating Statistics [Line Items]
Service charges and fees	$ 20.8	$ 7.6	$ 30.3	$ 14.6
Cash, Cash Equivalents and Investment Securities	12,527.0		12,527.0			$ 9,803.0
Loans Receivable Held-for-sale, Amount	3,156.0		3,156.0			1,184.0
Loans and Leases Receivable, Net of Deferred Income	47,875.0		47,875.0			51,862.0
Less: Allowance for credit losses	(321.0)		(321.0)			(310.0)
Loans, net	47,554.0		47,554.0			51,552.0
Other Repossessed Assets	11.0		11.0			11.0
Goodwill and intangible assets, net	674.0		674.0			680.0
Other Assets Segment	4,238.0		4,238.0			4,504.0
Assets	68,160.0		68,160.0			67,734.0
Deposits	51,041.0		51,041.0			53,644.0
Other borrowings	10,455.0		10,455.0			7,192.0
Other Liabilities Segment	979.0		979.0			1,542.0
Total liabilities	62,475.0		62,475.0			62,378.0
Stockholders' equity	5,684.9	4,958.8	5,684.9	4,958.8	$ 5,520.5	5,356.0	$ 5,011.6	$ 4,962.6
Liabilities and Equity	68,160.0		68,160.0			67,734.0
Excess Funds Provided by (Used in) Segment Basis	0.0		0.0			0.0
Net interest income	550.3	525.0	1,160.2	974.5
Provision for Loan, Lease, and Other Losses	21.8	27.5	41.2	36.5
Net interest income (loss) after provision for credit losses	528.5	497.5	1,119.0	938.0
Noninterest Income	119.0	(95.0)	(61.0)	(201.3)
Non-interest expense	(387.4)	(268.9)	(735.3)	(517.5)
Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Noncontrolling Interest	260.1	323.6	444.7	621.8
Income tax expense (benefit)	44.4	63.4	86.8	121.5
Net income	215.7	260.2	357.9	500.3
Operating Segments [Member] \| Commercial Segment
Operating Statistics [Line Items]
Cash, Cash Equivalents and Investment Securities	13.0		13.0			12.0
Loans Receivable Held-for-sale, Amount	1,049.0		1,049.0			0.0
Loans and Leases Receivable, Net of Deferred Income	28,139.0		28,139.0			31,414.0
Less: Allowance for credit losses	269.0		269.0			262.0
Loans, net	27,870.0		27,870.0			31,152.0
Other Repossessed Assets	11.0		11.0			11.0
Goodwill and intangible assets, net	293.0		293.0			293.0
Other Assets Segment	567.0		567.0			435.0
Assets	29,803.0		29,803.0			31,903.0
Deposits	21,460.0		21,460.0			29,494.0
Other borrowings	6.0		6.0			27.0
Other Liabilities Segment	70.0		70.0			83.0
Total liabilities	21,536.0		21,536.0			29,604.0
Stockholders' equity	2,494.0		2,494.0			2,684.0
Liabilities and Equity	24,030.0		24,030.0			32,288.0
Excess Funds Provided by (Used in) Segment Basis	5,773.0		5,773.0			(385.0)
Net interest income	356.5	370.5	746.0	705.3
Provision for Loan, Lease, and Other Losses	(18.2)	32.7	15.6	(33.2)
Net interest income (loss) after provision for credit losses	338.3	337.8	730.4	672.1
Noninterest Income	30.8	(18.0)	65.9	(34.9)
Non-interest expense	(147.7)	(115.9)	(283.6)	(230.4)
Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Noncontrolling Interest	221.4	239.9	380.9	476.6
Income tax expense (benefit)	43.4	57.3	81.9	113.4
Net income	178.0	182.6	299.0	363.2
Operating Segments [Member] \| Consumer Related Segment
Operating Statistics [Line Items]
Cash, Cash Equivalents and Investment Securities	150.0		150.0			0.0
Loans Receivable Held-for-sale, Amount	2,107.0		2,107.0			1,184.0
Loans and Leases Receivable, Net of Deferred Income	19,736.0		19,736.0			20,448.0
Less: Allowance for credit losses	52.0		52.0			48.0
Loans, net	19,684.0		19,684.0			20,400.0
Other Repossessed Assets	0.0		0.0			0.0
Goodwill and intangible assets, net	381.0		381.0			387.0
Other Assets Segment	1,693.0		1,693.0			2,180.0
Assets	24,015.0		24,015.0			24,151.0
Deposits	22,380.0		22,380.0			18,492.0
Other borrowings	1,489.0		1,489.0			340.0
Other Liabilities Segment	173.0		173.0			656.0
Total liabilities	24,042.0		24,042.0			19,488.0
Stockholders' equity	1,715.0		1,715.0			1,691.0
Liabilities and Equity	25,757.0		25,757.0			21,179.0
Excess Funds Provided by (Used in) Segment Basis	1,742.0		1,742.0			(2,972.0)
Net interest income	204.8	219.4	404.0	402.7
Provision for Loan, Lease, and Other Losses	1.9	(5.2)	3.4	5.3
Net interest income (loss) after provision for credit losses	202.9	224.6	400.6	397.4
Noninterest Income	(86.1)	(74.6)	(137.1)	(153.8)
Non-interest expense	(232.3)	(139.1)	(424.4)	(264.1)
Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Noncontrolling Interest	56.7	160.1	113.3	287.1
Income tax expense (benefit)	11.2	38.1	24.0	68.5
Net income	45.5	122.0	89.3	218.6
Corporate & Other
Operating Statistics [Line Items]
Cash, Cash Equivalents and Investment Securities	12,364.0		12,364.0			9,791.0
Loans Receivable Held-for-sale, Amount	0.0		0.0			0.0
Loans and Leases Receivable, Net of Deferred Income	0.0		0.0			0.0
Less: Allowance for credit losses	0.0		0.0			0.0
Loans, net	0.0		0.0			0.0
Other Repossessed Assets	0.0		0.0			0.0
Goodwill and intangible assets, net	0.0		0.0			0.0
Other Assets Segment	1,978.0		1,978.0			1,889.0
Assets	14,342.0		14,342.0			11,680.0
Deposits	7,201.0		7,201.0			5,658.0
Other borrowings	8,960.0		8,960.0			6,825.0
Other Liabilities Segment	736.0		736.0			803.0
Total liabilities	16,897.0		16,897.0			13,286.0
Stockholders' equity	1,476.0		1,476.0			981.0
Liabilities and Equity	18,373.0		18,373.0			14,267.0
Excess Funds Provided by (Used in) Segment Basis	(4,031.0)		(4,031.0)			$ (2,587.0)
Net interest income	(11.0)	(64.9)	10.2	(133.5)
Provision for Loan, Lease, and Other Losses	1.7	0.0	22.2	(2.0)
Net interest income (loss) after provision for credit losses	(12.7)	(64.9)	(12.0)	(131.5)
Noninterest Income	(2.1)	(2.4)	10.2	(12.6)
Non-interest expense	(7.4)	(13.9)	(27.3)	(23.0)
Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Noncontrolling Interest	(18.0)	(76.4)	(49.5)	(141.9)
Income tax expense (benefit)	(10.2)	(32.0)	(19.1)	(60.4)
Net income	$ (7.8)	$ (44.4)	$ (30.4)	$ (81.5)

Revenue from Contracts with Customers (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Disaggregation of Revenue [Line Items]
Service charges and fees	$ 20.8	$ 7.6	$ 30.3	$ 14.6
Noninterest Income	(119.0)	95.0	61.0	201.3
Revenue from Contracts with Customers	24.3	11.3	38.3	25.6
Operating Segments [Member] \| Commercial Segment
Disaggregation of Revenue [Line Items]
Noninterest Income	(30.8)	18.0	(65.9)	34.9
Operating Segments [Member] \| Consumer Related Segment
Disaggregation of Revenue [Line Items]
Noninterest Income	86.1	74.6	137.1	153.8
Corporate & Other
Disaggregation of Revenue [Line Items]
Noninterest Income	$ 2.1	$ 2.4	$ (10.2)	$ 12.6

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.