Cover Page - USD ($) $ in Billions	12 Months Ended
Cover Page - USD ($) $ in Billions	Dec. 31, 2021	Feb. 21, 2022	Jun. 30, 2021
Entity Information [Line Items]
Amendment Flag	false
Document Fiscal Year Focus	2021
Entity Central Index Key	0001312109
Document Fiscal Period Focus	FY
Document Type	10-K
Document Annual Report	true
Document Period End Date	Dec. 31, 2021
Current Fiscal Year End Date	--12-31
Document Transition Report	false
Entity File Number	001-39123
Entity Registrant Name	SILVERGATE CAPITAL CORPORATION
Entity Incorporation, State or Country Code	MD
Entity Tax Identification Number	33-0227337
Entity Address, Address Line One	4250 Executive Square
Entity Address, Address Line Two	Suite 300
Entity Address, City or Town	La Jolla
Entity Address, State or Province	CA
Entity Address, Postal Zip Code	92037
City Area Code	858
Local Phone Number	362-6300
Entity Well-known Seasoned Issuer	Yes
Entity Voluntary Filers	No
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Large Accelerated Filer
Entity Emerging Growth Company	false
Entity Small Business	false
ICFR Auditor Attestation Flag	true
Entity Shell Company	false
Entity Public Float			$ 2.9
Entity Common Stock, Shares Outstanding (shares)		31,624,497
Documents Incorporated by Reference	DOCUMENTS INCORPORATED BY REFERENCE The information required by Items 10, 11, 12, 13 and 14 of Part III of this Annual Report on Form 10-K will be found in the Company’s definitive proxy statement for its 2022 Annual Meeting of Stockholders, to be filed pursuant to Regulation 14A under the Securities Exchange Act of 1934, as amended, and such information is incorporated herein by this reference.
Class A Common Stock
Entity Information [Line Items]
Title of 12(b) Security	Class A Common Stock, par value $0.01 per share
Trading Symbol	SI
Security Exchange Name	NYSE
Depositary Shares, Each Representing a 1/40th Interest in a Share of 5.375% Fixed Rate Non-Cumulative Perpetual Preferred Stock, Series A
Entity Information [Line Items]
Title of 12(b) Security	Depositary Shares, Each Representing a 1/40th Interest in a Share of 5.375% Fixed Rate Non-Cumulative Perpetual Preferred Stock, Series A
Trading Symbol	SI PRA
Security Exchange Name	NYSE

Audit Information	12 Months Ended
Audit Information	Dec. 31, 2021
Audit Information [Abstract]
Auditor Firm ID	173
Auditor Name	Crowe LLP
Auditor Location	Costa Mesa, California

CONSOLIDATED STATEMENTS OF FINANCIAL CONDITION - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
ASSETS
Cash and due from banks	$ 208,193	$ 16,405
Interest earning deposits in other banks	5,179,753	2,945,682
Cash and cash equivalents	5,387,946	2,962,087
Securities available-for-sale, at fair value	8,625,259	939,015
Loans held-for-sale, at lower of cost or fair value	893,194	865,961
Loans held-for-investment, net of allowance for loan losses of $6,916 at December 31, 2021 and 2020	887,304	746,751
Federal home loan and federal reserve bank stock, at cost	34,010	14,851
Accrued interest receivable	40,370	8,698
Premises and equipment, net	3,008	2,072
Derivative assets	34,056	31,104
Other assets	100,348	15,696
Total assets	16,005,495	5,586,235
Deposits:
Noninterest bearing demand accounts	14,213,472	5,133,579
Interest bearing accounts	77,156	114,447
Total deposits	14,290,628	5,248,026
Subordinated debentures, net	15,845	15,831
Accrued expenses and other liabilities	90,186	28,079
Total liabilities	14,396,659	5,291,936
Commitments and contingencies
Preferred stock, $0.01 par value—authorized 10,000 shares; $1,000 per share liquidation preference, 200 and 0 shares issued and outstanding at December 31, 2021 and 2020, respectively	2	0
Additional paid-in capital	1,421,592	129,726
Retained earnings	193,860	118,348
Accumulated other comprehensive (loss) income	(6,922)	46,036
Total shareholders’ equity	1,608,836	294,299
Total liabilities and shareholders’ equity	16,005,495	5,586,235
Class A common stock, $0.01 par value—authorized 125,000 shares; 30,403 and 18,770 shares issued and outstanding at December 31, 2021 and 2020, respectively
Deposits:
Common stock	304	188
Class B non-voting common stock, $0.01 par value—authorized 25,000 shares; 0 and 64 shares issued and outstanding at December 31, 2021 and 2020, respectively
Deposits:
Common stock	$ 0	$ 1

CONSOLIDATED STATEMENTS OF FINANCIAL CONDITION (Parenthetical) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Allowance for loan losses	$ 6,916	$ 6,916
Preferred stock, par value (USD per share)	$ 0.01	$ 0.01
Preferred stock authorized (shares)	10,000,000	10,000,000
Preferred stock liquidation preference (USD per share)	$ 1,000	$ 1,000
Preferred stock issued (shares)	200,000	0
Preferred stock outstanding (shares)	200,000	0
Class A Common Stock
Common stock, par value (USD per share)	$ 0.01	$ 0.01
Common stock authorized (shares)	125,000,000	125,000,000
Common stock issued (shares)	30,403,000	18,770,000
Common stock outstanding (shares)	30,403,000	18,770,000
Class B Common Stock
Common stock, par value (USD per share)	$ 0.01	$ 0.01
Common stock authorized (shares)	25,000,000	25,000,000
Common stock issued (shares)	0	64,000
Common stock outstanding (shares)	0	64,000

CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Interest income
Loans, including fees	$ 68,619	$ 54,732
Taxable securities	36,094	17,465
Tax-exempt securities	17,301	5,062
Other interest earning assets	6,799	1,639
Dividends and other	1,581	692
Total interest income	130,394	79,590
Interest expense
Deposits	134	5,807
Federal home loan bank advances	0	336
Subordinated debentures and other	993	1,083
Total interest expense	1,127	7,226
Net interest income before provision for loan losses	129,267	72,364
Provision for loan losses	0	742
Net interest income after provision for loan losses	129,267	71,622
Noninterest income
Mortgage warehouse fee income	3,056	2,539
Deposit related fees	35,981	11,341
Gain on sale of securities, net	5,238	3,753
Gain on sale of loans, net	0	354
Gain on extinguishment of debt	0	925
Other income	981	265
Total noninterest income	45,256	19,177
Noninterest expense
Salaries and employee benefits	45,794	36,493
Occupancy and equipment	2,464	5,690
Communications and data processing	7,072	5,406
Professional services	9,776	4,460
Federal deposit insurance	13,537	1,172
Correspondent bank charges	2,515	1,533
Other loan expense	1,117	326
Other general and administrative	6,845	4,525
Total noninterest expense	89,120	59,605
Income before income taxes	85,403	31,194
Income tax expense	6,875	5,156
Net income	78,528	26,038
Dividends on preferred stock	3,016	0
Net income available to common shareholders. basic	75,512	26,038
Net income available to common shareholders, diluted	$ 75,512	$ 26,038
Earnings Per Share:
Basic earnings per common share (USD per share)	$ 2.95	$ 1.39
Diluted earnings per common share (USD per share)	$ 2.91	$ 1.36
Weighted average common shares outstanding:
Basic (shares)	25,582	18,691
Diluted (shares)	25,922	19,177

CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Statement of Comprehensive Income [Abstract]
Net income	$ 78,528	$ 26,038
Other comprehensive income (loss):
Change in net unrealized (loss) gain on available-for-sale securities	(48,731)	38,310
Less: Reclassification adjustment for net gain included in net income	(5,238)	(3,753)
Income tax effect	15,323	(9,670)
Unrealized (loss) gain on available-for-sale securities, net of tax	(38,646)	24,887
Change in net unrealized (loss) gain on derivative assets	(17,780)	22,186
Less: Reclassification adjustment for net gain included in net income	(2,046)	(1,713)
Income tax effect	5,514	(5,725)
Unrealized (loss) gain on derivative instruments, net of tax	(14,312)	14,748
Other comprehensive (loss) income	(52,958)	39,635
Total comprehensive income	$ 25,570	$ 65,673

CONSOLIDATED STATEMENTS OF SHAREHOLDERS' EQUITY - USD ($) $ in Thousands	Total	Class A Common Stock	Class B Common Stock	Preferred Stock	Common Stock Class A Common Stock	Common Stock Class B Common Stock	Additional Paid-In Capital	Retained Earnings	Accumulated Other Comprehensive Income/(Loss)
Balance at beginning of period (shares) at Dec. 31, 2019				0	17,775,160	892,836
Balance at beginning of period at Dec. 31, 2019	$ 231,036			$ 0	$ 178	$ 9	$ 132,138	$ 92,310	$ 6,401
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Total comprehensive income, net of tax	65,673							26,038	39,635
Conversion of Class B common stock to Class A common stock (shares)					828,639	(828,639)
Conversion of Class B common stock to Class A common stock	0				$ 8	$ (8)
Stock-based compensation	884						884
Exercise of stock options and issuance of share-based awards, net of shares withheld for employee taxes (shares)					165,972
Exercise of stock options and issuance of share-based awards, net of shares withheld for employee taxes	(3,294)				$ 2		(3,296)
Balance at end of period (shares) at Dec. 31, 2020		18,770,000	64,000	0	18,769,771	64,197
Balance at end of period at Dec. 31, 2020	294,299			$ 0	$ 188	$ 1	129,726	118,348	46,036
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Total comprehensive income, net of tax	25,570							78,528	(52,958)
Dividends on preferred stock	(3,016)							(3,016)
Net proceeds from stock issuance (shares)				200,000	11,164,214
Net proceeds from stock issuance	1,291,436			$ 2	$ 111		1,291,323
Conversion of Class B common stock to Class A common stock (shares)					64,197	(64,197)
Conversion of Class B common stock to Class A common stock	0				$ 1	$ (1)
Stock-based compensation	1,932						1,932
Exercise of stock options and issuance of share-based awards, net of shares withheld for employee taxes (shares)					404,524
Exercise of stock options and issuance of share-based awards, net of shares withheld for employee taxes	(1,385)				$ 4		(1,389)
Balance at end of period (shares) at Dec. 31, 2021		30,403,000	0	200,000	30,402,706	0
Balance at end of period at Dec. 31, 2021	$ 1,608,836			$ 2	$ 304	$ 0	$ 1,421,592	$ 193,860	$ (6,922)

CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Cash flows from operating activities
Net income	$ 78,528	$ 26,038
Adjustments to reconcile net income to net cash provided by (used in) operating activities:
Depreciation and amortization	2,620	5,584
Amortization of securities premiums and discounts, net	55,003	3,890
Amortization of loan premiums and discounts and deferred loan origination fees and costs, net	604	825
Stock-based compensation	1,932	884
Provision for loan losses	0	742
Originations of loans held-for-sale	(12,655,625)	(7,728,152)
Proceeds from sales of loans held-for-sale	12,628,392	7,227,762
Other gains, net	(9,202)	(8,684)
Other, net	(174)	(70)
Changes in operating assets and liabilities:
Accrued interest receivable and other assets	(93,948)	(6,779)
Accrued expenses and other liabilities	71,628	(1,354)
Net cash provided by (used in) operating activities	79,758	(479,314)
Cash flows from investing activities
Purchases of securities available-for-sale	(9,648,657)	(283,706)
Proceeds from sale of securities available-for-sale	1,465,506	216,355
Proceeds from paydowns and maturities of securities available-for-sale	381,354	58,769
Loan originations/purchases and payments, net	(141,157)	(109,442)
Proceeds from sale of loans held-for-sale previously classified as held-for-investment	0	36,400
Purchase of federal home loan and federal reserve bank stock, net	(19,160)	(4,587)
Purchase of premises and equipment	(1,922)	(916)
(Payments for) proceeds from derivative contracts, net	(19,494)	16,372
Other, net	(6)	173
Net cash used in investing activities	(7,983,536)	(70,582)
Cash flows from financing activities
Net change in noninterest bearing deposits	9,079,893	3,789,913
Net change in interest bearing deposits	(37,291)	(356,541)
Net change in federal home loan bank advances	0	(48,075)
Payments made on notes payable	0	(3,714)
Proceeds from common stock issuance, net	1,097,815	0
Proceeds from preferred stock issuance, net	193,621	0
Payments of preferred stock dividends	(3,016)	0
Proceeds from stock option exercise	1,923	41
Taxes paid related to net share settlement of equity awards	(3,308)	(3,335)
Other, net	0	90
Net cash provided by financing activities	10,329,637	3,378,379
Net increase in cash and cash equivalents	2,425,859	2,828,483
Cash and cash equivalents, beginning of period	2,962,087	133,604
Cash and cash equivalents, end of period	5,387,946	2,962,087
Supplemental cash flow information:
Cash paid for interest	1,164	7,526
Income taxes paid, net	9,638	5,965
Supplemental noncash disclosures:
Loans held-for-investment transferred to loans held-for-sale	0	30,792
Loans held-for-sale transferred to loans held-for-investment	0	5,098
Loans transferred to other real estate owned	0	51
Right-of-use assets obtained in exchange for new operating lease liabilities	$ 3,512	$ 0

Nature of Business and Summary of Significant Accounting Policies	12 Months Ended
	Dec. 31, 2021
Accounting Policies [Abstract]
Nature of Business and Summary of Significant Accounting Policies	Nature of Business and Summary of Significant Accounting Policies Nature of Business The accompanying consolidated financial statements include the accounts of Silvergate Capital Corporation, a Maryland corporation, and its wholly-owned subsidiary, Silvergate Bank (the “Bank”), collectively referred to as (the “Company” or “Silvergate”). The Company’s assets consist primarily of its investment in the Bank and its primary activities are conducted through the Bank. The Company is a registered bank holding company that is subject to supervision by the Board of Governors of the Federal Reserve (“Federal Reserve”). The Bank is subject to regulation by the California Department of Financial Protection and Innovation, Division of Financial Institutions (“DFPI”), and, as a Federal Reserve member bank since 2012, the Federal Reserve Bank of San Francisco (“FRB”). The Bank’s deposits are insured up to legal limits by the Federal Deposit Insurance Corporation (“FDIC”). The Bank provides financial services that include commercial banking, mortgage warehouse lending, commercial business lending and real estate lending. In 2013, the Company began exploring the digital currency industry and has significantly expanded the product and services since that time to support the Company’s growing digital currency initiative, including the implementation of deposit and cash management services for the digital currency related businesses domestically and internationally. Correspondingly, the Company has significantly de-emphasized real estate lending and lending activities are focused on digital currency collateralized loans and mortgage warehouse loans. Basis of Presentation The consolidated financial statements include the accounts of the Company and all other entities in which it has a controlling financial interest. All significant intercompany accounts and transactions have been eliminated in consolidation. Unless the context requires otherwise, all references to the Company include its wholly owned subsidiaries. The accounting and reporting policies of the Company conform with Generally Accepted Accounting Principles (“GAAP”) and conform to predominant practices within the financial services industry. Significant accounting policies followed by the Company are presented below. Reclassifications Certain immaterial reclassifications have been made to the consolidated financial statements to conform to the current year’s presentation. 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 the disclosure of contingent assets and liabilities at the date of the financial statements and the accompanying notes, as well as the reported amounts of revenue and expense during the reporting period. Management bases estimates on historical experience and on various other assumptions that are believed to be reasonable under current circumstances, results of which form the basis for making judgments about the carrying value of certain assets and liabilities that are not readily available from other sources. Management evaluates estimates on an ongoing basis including the economic impact of Coronavirus Disease 2019 (or “COVID-19”). Actual results could materially differ from those estimates under different assumptions or conditions. The following accounting policies, together with those disclosed elsewhere in the consolidated financial statements, represent the significant accounting policies of the Company. Cash and Cash Equivalents Cash and cash equivalents include cash and due from banks and interest earning deposits in other banks, including federal funds sold. The Company maintains amounts due from Banks which exceed federally insured limits. The Company has not experienced any losses in such accounts. Net cash flows are reported for customer loan and deposit transactions. Interest earning deposits in other banks include funds held in other financial institutions that are either fixed or variable rate instruments, including certificates of deposits. Securities Management determines the appropriate classification of debt securities at the time of purchase. The fair values of securities available-for-sale and trading securities are determined by obtaining quoted prices on nationally recognized securities exchanges (Level 1) or matrix pricing, which is a mathematical technique used widely in the industry to value debt securities without relying exclusively on quoted prices for specific securities but rather by relying on the securities’ relationship to other benchmark quoted securities (Level 2). Securities to be held for indefinite periods of time, but not necessarily to be held-to-maturity or on a long-term basis, are classified as available-for-sale and carried at fair value, with unrealized gains or losses, net of applicable deferred income taxes, reported as a separate component of shareholders’ equity in accumulated other comprehensive income. Interest income is recognized under the interest method and includes amortization of purchase premiums and accretion of purchase discounts. Premiums and discounts on securities are amortized or accreted based on a level yield methodology, without anticipating prepayments, except for mortgage-backed securities where prepayments are anticipated. Realized gains or losses on the sale of securities are determined using the specific identification method and are recorded on settlement date. Securities classified as available-for-sale include securities that management intends to use as part of its asset / liability management strategy and may be sold to provide liquidity in response to changes in interest rates, prepayment risk, or other related factors. Securities classified as held-to-maturity are carried at amortized cost when management has the positive intent to hold the securities to maturity. Management evaluates securities for other than temporary impairment (OTTI) on a monthly basis. Management considers, among other things, (i) the length of time and the extent to which the fair value has been less than cost, (ii) the financial condition and near-term prospects of the issuer, and (iii) the Company’s intent and ability to retain the investment for a period of time sufficient to allow for any anticipated recovery in fair value. Evidence evaluated includes, but is not limited to, the remaining payment terms of the instrument and economic factors that are relevant to the collectability of the instrument, such as: current prepayment speeds, the current financial condition of the issuer(s), industry analyst reports, credit ratings, credit default rates, interest rate trends, the quality of any credit enhancement and the value of any underlying collateral. For each security in an unrealized loss position, the Company assesses whether it intends to sell the security or if it is more likely than not that the Company will be required to sell the security before recovery of its amortized cost basis less any current-period credit losses. If the Company intends to sell the security or it is more likely than not the Company will be required to sell the security before recovery of its amortized cost basis less any current-period credit loss, the entire difference between the investment’s amortized cost basis and its fair value at the balance sheet date is recognized in earnings. For impaired securities that are not intended for sale and will not be required to be sold prior to recovery of the Company’s amortized cost basis, the Company determines if the impairment has a credit loss component. For both held-to-maturity and available-for-sale securities, if there is no credit loss, no further action is required. For both held-to-maturity and available-for-sale securities, if the amount or timing of cash flows expected to be collected are less than those at the last reporting date, an other-than-temporary impairment shall be considered to have occurred and the credit loss component is recognized in earnings as the present value of the change in expected future cash flows. In determining the present value of the expected cash flows the Company discounts the expected cash flows at the effective interest rate implicit in the security at the date of purchase. The remaining difference between the security’s fair value and the amortized basis is deemed to be due to factors that are not credit related and is recognized in other comprehensive income, net of applicable taxes. Loans Held-for-investment Loans that management has the intent and ability to hold for the foreseeable future or until maturity or payoff are reported at the principal balance outstanding, net of deferred loan fees, unamortized premiums and discounts and an allowance for loan loss. Interest on loans is accrued using the effective interest method based on principal amounts outstanding. Nonrefundable loan fees and certain direct costs associated with the origination of loans are deferred and recognized as an adjustment to interest income over the contractual life of the loans using the level yield method, without anticipating prepayments, or straight-lined for loans with revolving features such as construction loans or lines of credit. The accretion of loan fees and costs is discontinued on nonaccrual loans. In addition to originating loans, the Company may, from time to time, purchases individual loans and groups of loans. For those purchased loans that management intends to hold for the foreseeable future or until maturity, the purchase premiums and discounts are amortized or accreted using the effective interest method over the remaining contractual life of the loan or straight-lined to their estimated termination for loans with revolving features such as reverse mortgages. Nonaccrual Loans Loans are placed on nonaccrual status when, in the opinion of management, the full and timely collection of principal or interest is in doubt. Generally, the accrual of interest is discontinued when principal or interest payments become 90 or more days past due. In all cases, loans are placed on nonaccrual or charged-off at an earlier date if collection of the principal or interest is considered doubtful. When a loan is placed on nonaccrual status, previously accrued but unpaid interest is reversed against current income. Subsequent collections of unpaid amounts on such a loan are applied to reduce principal when received, except when the ultimate collectability of principal is probable, in which case interest payments are credited to income. Nonaccrual loans may be restored to accrual status if and when principal and interest become current and full repayment is expected, which is typically after six months of continuous on time payments. Allowance for Loan Losses The allowance for loan losses is a valuation allowance for probable incurred credit losses. Management groups loans into different categories based on loan type to determine the appropriate allowance for each loan group. Management estimates the allowance balance required using past loan loss experience, current economic conditions, the nature and volume of the portfolio, information about specific borrower situations, estimated collateral values and other factors. Allocations of the allowance may be made for specific loans, but the entire allowance is available for any loan that, in management’s judgment, should be charged off. Amounts are charged off when available information confirms that specific loans, or portions thereof, are uncollectible. This methodology for determining charge-offs is consistently applied to each group of loans. Loans that are deemed to be uncollectible are charged off and deducted from the allowance for loan losses. The provision for loan losses and recoveries on loans previously charged off are credited to the allowance for loan losses. The allowance consists of specific and general components. The specific component relates to loans that are individually classified as impaired when, based on current information and events, it is probable that the Company will be unable to collect all amounts due according to the contractual terms of the loan agreement. Loans for which the terms have been modified resulting in a concession, and for which the borrower is experiencing financial difficulties, are considered troubled debt restructurings (TDRs) and classified as impaired. A loan is considered impaired when full payment under the loan terms is not expected. Impairment is evaluated on an individual loan basis for all loans that meet the criteria for specifically evaluated impairment. If a loan is impaired, a portion of the allowance is allocated so that the loan is reported, net of the present value of estimated future cash flows using the loan’s original effective rate or at the fair value of collateral less estimated costs to sell if repayment is expected solely from the collateral. Factors considered in determining impairment include payment status, collateral value and the probability of collecting all amounts when due. Large groups of smaller-balance homogeneous loans such as residential real estate loans are collectively evaluated for impairment and, accordingly, they are not separately identified for impairment disclosures. Loans that experience insignificant payment delays and payment shortfalls are generally not classified as impaired. Management considered the significance of payment delays on a case by case basis, taking into consideration all the circumstances of the loan and borrower, including the length of delay, the reasons for the delay, the borrower’s prior payment record, and the amount of the shortfall in relation to principal and interest owed. The general component covers loans that are collectively evaluated for impairment and loans that are not individually identified for impairment evaluation. The general component is based on historical loss experience adjusted for current factors and includes actual loss history experienced for the preceding rolling twelve-year period or less, if twelve years of data is not available. This actual loss experience is supplemented with other economic factors based on the risks present for each portfolio segment using a qualitative scorecard model. Qualitative adjustments to historic loss rates are made for each portfolio segment based on the following factors: changes in lending policies and procedures, including changes in underwriting standards and collection, charge-off, and recovery practices not considered elsewhere in estimating credit losses; changes in international, national, regional, and local economic and business conditions and developments that affect the collectability of the portfolio, including the condition of various market segments; changes in the nature and volume of the portfolio and in the terms of loans; changes in the experience, ability, and depth of lending management and other relevant staff; changes in the volume and severity of past due loans, the volume of non-accrual loans, and the volume and severity of adversely classified or graded loans; changes in the quality of the institution’s loan review system; changes in the value of underlying collateral for collateral-dependent loans; the existence and effect of any concentrations of credit, and changes in the level of such concentrations; and the effect of other external factors such as competition and legal and regulatory requirements on the level of estimated credit losses in the institution’s existing portfolio. The range of qualitative adjustments applied to each portfolio segment is based on management’s evaluation of risk factors applied to historic loan and net-charge-off experience for peer data as reported in the call report for each specific loan portfolio segment. For the commercial and industrial loan segment a different methodology is used to estimate the allowance based on qualitative adjustments only, primarily trends in collateral, changes in nature and volume of the portfolio, concentration risk and external factors, due to the lack of historical loss rates and peer data available for that portfolio segment. Troubled Debt Restructurings Loans are reported as TDRs when the Company grants concessions to a borrower experiencing financial difficulties that it would not otherwise consider. Examples of such concessions include forgiveness of principal or accrued interest, extending the maturity date, or providing a lower interest rate than would be normally available for a transaction of similar risk. As a result of these concessions, restructured loans are impaired as the Company will not collect all amounts due, both principal and interest, in accordance with the terms of the original loan agreement. TDRs are individually evaluated for impairment and included in separately identified impairment disclosures. TDRs are measured at the present value of estimated cash flows using the loan’s effective rate at inception. If a TDR is considered to be a collateral dependent loan, the loan is reported, net, at the fair value of the collateral. For TDRs that subsequently default, the Company determined the amount of the allowance on the loan in accordance with the accounting policy for the allowance for loan losses on loans individually identified as impaired. The Company incorporates recent historical experience related to TDRs, including the performance of TDRs that subsequently defaulted, into the allowance calculation by loan portfolio segment. Loans Held-for-sale Certain loans originated or acquired and intended for sale in the secondary market are carried at the lower of cost or estimated fair value in the aggregate, as determined by outstanding commitments from investors. Net unrealized losses are recognized through a valuation allowance by charges to income. Gains or losses realized on the sales of loans are recognized at the time of sale and are determined by the difference between the net sales proceeds and the carrying value of the loans sold, adjusted for any servicing asset or liability. Gains and losses on sales of loans are included in noninterest income. Transfers of loans are accounted for as sales when control over the assets has been surrendered. Control over transferred assets is deemed to be surrendered when (1) the assets have been isolated from the Company, (2) the transferee obtains the right (free of conditions that constrain it from taking advantage of that right) to pledge or exchange the transferred assets, and (3) the Company does not maintain effective control through an agreement to purchase them before their maturity. In the event of a breach of representations and warranties, the Company may be required to repurchase a mortgage loan or indemnify the purchaser, and any subsequent loss on the mortgage loan may be borne by the Company. If there is no breach of a representation and warranty provision, the Company has no obligation to repurchase the loan or indemnify the investor against loss. In cases where the Company repurchases loans, it bears the subsequent credit loss on the loans. Repurchased loans are classified as held-for-sale and are initially recorded at fair value until disposition. The Company seeks to manage the risk of repurchase and associated credit exposure through our underwriting and quality assurance practices and by servicing mortgage loans to meet investor standards. Federal Home Loan Bank (“FHLB”) and Federal Reserve Bank (“FRB”) Stock The Bank is a member of the FHLB of San Francisco and the FRB system. Members are required to own a certain amount of stock based on the level of borrowings and other factors, and may invest in additional amounts. Investments in nonmarketable equity securities, such as FHLB stock and FRB stock, are recorded at cost, classified as a restricted security and periodically evaluated for impairment based on ultimate recovery of par value. Both cash and stock dividends are reported as income. Premises and Equipment Premises and equipment are stated at cost less accumulated depreciation and amortization. Amortization of leasehold improvements is computed on a straight-line basis over the terms of the leases or the estimated useful lives of the improvements, whichever is shorter. Depreciation of equipment, furniture, and automobiles is charged to operating expense over the estimated useful lives of the assets on a straight-line basis. The estimated useful lives of equipment, furniture, and automobiles range from three to ten years. Software is stated at cost less accumulated amortization. Amortization of software is computed on a straight-line basis over the shorter of the estimated useful life of the software or contract, and this period is typically three to five years. Loan Commitments Financial instruments include off-balance sheet credit instruments, such as commitments to make loans and commercial letters of credit, issued to meet customer financing needs. The face amount for these items represents the exposure to loss, before considering customer collateral or ability to repay. Such financial instruments are recorded when they are funded. Derivative Financial Instruments At the inception of a derivative contract, the Company designates the derivative as one of three types based on the Company’s intention and belief as the likely effectiveness as a hedge. These three types are (1) a hedge of fair value of a recognized asset or liability or of an unrecognized firm commitment (“fair value hedge”), (2) a hedge of a forecasted transaction or the variability of cash flows to be received or paid related to a recognized asset or liability (“cash flow hedge”), or (3) an instrument with no hedging designation (“stand alone derivative”). For a fair value hedge, the gain or loss on the derivative as well as the offsetting loss or gain on the hedged item, are recognized in current earnings as fair values change. For a cash flow hedge, the gain or loss on the derivative is reported in other comprehensive income and is reclassified into earnings in the same period during which the hedged transaction affects the earnings. The changes in fair value of derivatives that do not qualify for hedge accounting are reported in current earnings, as noninterest income. Net cash settlements on derivatives that qualify for hedge accounting are recorded in interest income or interest expense, based on the item being hedged. Net cash settlements on derivatives that do not qualify for hedge accounting are reported in noninterest income. Cash flows on hedges are classified in the cash flow statement the same as the cash flows of the item being hedged. The Company formally documents the relationship between the derivative and hedged items, as well as the risk-management objective and the strategy for undertaking hedge transactions at the inception of the hedging relationship. This documentation includes linking fair value or cash flow hedges to specific assets and liabilities on the balance sheet or to specific firm commitments or forecasted transactions. The Company also formally assesses, both at the hedge’s inception and on an ongoing basis, whether the derivative instruments that are used are highly effective in offsetting the changes in fair values or cash flows of the hedged items. The initial fair value of hedge components excluded from the assessment of effectiveness is recognized in the statement of financial condition under a systematic and rational method over the life of the hedging instrument and is presented in the same income statement line item as the earnings effect of the hedged item. Any difference between the change in the fair value of the hedge components excluded from the assessment of effectiveness and the amounts recognized in earnings is recorded as a component of other comprehensive income. The Company discontinues hedge accounting when it determines that the derivative is no longer effective in offsetting changes in fair values or cash flows of the hedged item, the derivative is settled or terminates, a hedged forecasted transaction is no longer probable, a hedged firm commitment is no longer firm, or treatment of the derivative as a hedge is no longer appropriate or intended. When hedge accounting is discontinued, subsequent changes in fair value of the derivative are recorded as noninterest income. When a fair value hedge is discontinued, the hedged asset or liability is no longer adjusted for changes in fair value and the existing basis adjustment is amortized or accreted over the remaining life of the asset or liability. When a cash flow hedge is discontinued but the hedged cash flows or forecasted transactions are still expected to occur, gains or losses that were accumulated in other comprehensive income are amortized into earnings over the same periods which the hedged transactions will affect earnings. The Company is exposed to losses if a counterparty fails to make its payments under a contract in which the Company is in the net receiving position. The Company anticipates that the counterparties will be able to fully satisfy their obligation under the agreements. All the contracts to which the Company is a party settle monthly or quarterly. In addition, the Company obtains collateral above certain thresholds of the fair value of its hedges for each counterparty based upon their credit standing and the Company has netting agreements with the dealers with which it does business. The Company has elected to not offset fair value amounts and present derivative assets and liabilities on a gross basis in the statement of financial condition. Income Taxes Income tax expense is the total of the current year income tax due or refundable and the change in deferred tax assets and liabilities. Deferred tax assets and liabilities are recognized for the future tax amounts attributable to differences between the financial statement carrying amounts of assets and liabilities and their respective tax bases, computed using enacted tax rates. The effect on deferred tax assets and liabilities of a change in tax rates is recognized in income in the period that includes the enactment date. A valuation allowance, if needed, reduces deferred tax assets to the amount expected to be realized. The Company accounts for uncertainty in tax positions taken or expected to be taken on a tax return in accordance with FASB ASC Topic 740, Accounting for Income Taxes, and provides that the tax effects from an uncertain tax position can be recognized in the financial statements only if, based on its merits, the position is more likely than not to be sustained on audit by the taxing authorities. Management believes that all tax positions taken to date are highly certain and, accordingly, no accounting adjustment has been made to the financial statements. Interest and penalties, if any, related to uncertain tax positions are recorded as part of income tax expense. Stock-based Compensation The Company accounts for stock-based compensation in accordance with FASB ASC Topic 718, Compensation—Stock Compensation, that generally requires entities to recognize the cost of employee services received in exchange for awards of stock options, restricted stock or other equity instruments, based on the grant date fair value of those awards. Compensation cost is recognized for awards issued to employees based on the fair value of these awards at the date of grant. A Black-Scholes model is utilized to estimate the fair value of stock options. This cost is recognized over the period which an employee is required to provide services in exchange for the award, generally the vesting period. Fair Value Measurement The Company measures and presents fair values in accordance with FASB ASC Topic 820, Fair Value Measurement, that defines fair value, establishes a framework for measuring fair value, and requires disclosures about fair value measurements. This standard establishes a fair value hierarchy about the assumptions used to measure fair value and clarifies assumptions about risk and the effect of a restriction on the sale or use of an asset. Fair value is defined as the exchange price that would be received for an asset or paid to transfer a liability (an exit price) in the principal or most advantageous market for the asset or liability in an orderly transaction between market participants on the measurement date. This standard’s fair value hierarchy requires an entity to maximize the use of observable inputs and minimize the use of unobservable inputs when measuring fair value. The standard describes three levels of inputs that may be used to measure fair value: Level 1—Quoted prices (unadjusted) for identical assets or liabilities in active markets that the entity has the ability to access as of the measurement date. Level 2—Significant observable inputs other than Level 1 prices, such as quoted prices for similar assets or liabilities; quoted prices in markets that are not active; or other inputs that are observable or can be corroborated by observable market data. Level 3—Significant unobservable inputs that reflect a Company’s own assumptions about the assumptions that market participants would use in pricing an asset or liability. Revenue Recognition On January 1, 2018, the Company adopted FASB ASC 606, Revenue from Contracts with Customers (“ASC 606”), which establishes a single framework for recognizing revenue from contracts with customers that fall within its scope. The core principle of the guidance requires an entity to recognize revenue to depict the transfer of promised goods or services to customers in an amount that reflects the consideration that it expects to be entitled to receive in exchange for those goods or services recognized as performance obligations are satisfied. The majority of the Company's revenues are not subject to ASC 606, including revenue generated from financial instruments, such as loans, letters of credit, and derivatives and investment securities, as these activities are subject to other applicable GAAP. Revenue streams within the scope of and accounted under ASC 606 include service charges and fees on deposit accounts, fees from other services the Company provides its customers, such as mortgage warehouse fee income and foreign exchange fee income and gains and losses from the sale of property, premises and equipment. These revenue streams are presented in the Company's consolidated statements of operations as components of noninterest income. Service charges on deposit accounts and other service fee income consist of periodic service charges on deposit accounts and transaction based fees such as those related to wire transfer fees, ACH fees, stop payment fees, insufficient funds fees, foreign exchange fee income and mortgage warehouse fees. Performance obligations for periodic service charges are typically short-term in nature, can be canceled anytime by the customer or the Company and are generally satisfied over a monthly period, while performance obligations for other transaction based fees are typically satisfied at a point in time (which may consist of only a few moments to perform the service or transaction) with no further obligation beyond the completion of the service or transaction. Periodic service charges are generally collected directly from a customer’s deposit account on a monthly basis, at the end of a statement cycle, while transaction-based service charges are typically collected and earned at the time of or soon after the service is performed. Other revenue streams that may be applicable to the Company include gains and losses from the sale of non-financial assets such as property, premises and equipment. The Company accounts for these revenue streams in accordance with ASC 610-20, which requires the Company to refer to guidance in ASC 606 in the application of certain measurement and recognition concepts. The Company records gains and losses on the sale of non-financial assets when control of the asset has been surrendered to the buyer, which generally occurs at a specific point in time. Operating Segments While the chief decision-makers monitor the revenue streams of the various products and services, operations are managed and financial performance is evaluated on a Company-wide basis. Operating results are not reviewed by senior management to make resource allocation or performance decisions. Accordingly, all of the financial service operations are considered by management to be aggregated in one reportable operating segment. Earnings Per Share Basic earnings per share is computed on the basis of the weighted average number of common shares outstanding during the year. Diluted earnings per share is computed on the basis of the weighted average number of common shares outstanding and any dilutive common equivalent shares resulting from stock options or awards. Comprehensive Income The Company presents comprehensive income in accordance with FASB ASC Topic 220, Comprehensive Income, that requires the disclosure of comprehensive income (loss) and its components. Other comprehensive income (loss) includes unrealized gains and losses on securities available-for-sale and the change in the fair value of cash flow hedges, net of deferred tax effects, which are also recognized as a separate component of equity. Recently Issued Accounting Pronouncements Not Yet Effective In June 2016, the Financial Accounting Standards Board (the “FASB”) issued Accounting Standards Update (or “ASU”) 2016-13, Financial Instruments—Credit Losses (Topic 326) to replace the incurred loss model with an expected loss model, which is referred to as the current expected credit loss (or “CECL”) model. The CECL model is applicable to the measurement of credit losses on financial assets measured at amortized cost, including loan receivables, held to maturity debt securities, and reinsurance receivables. It also applies to off-balance sheet credit exposures not accounted for as insurance (loan commitments, standby letters of credit, financial guarantees, and other similar instruments) and net investments in leases recognized by a lessor. These amendments were initially effective for fiscal years beginning after December 15, 2019 for SEC registrants and after December 15, 2020, for Public Business Entities, or PBEs. In November 2019, the FASB issued ASU 2019-10, Financial Instruments—Credit Losses (Topic 326), Derivatives and Hedging (Topic 815), and Leases (Topic 842): Effective Dates, which finalized the delay of the effective date for smaller reporting companies, as of the ASU 2019-10 effective date, such as the Company to apply the standards related to CECL, until fiscal years beginning after December 15, 2022. For debt securities with other than temporary impairment (OTTI), the guidance will be applied prospectively and for existing purchased credit impaired (PCI) assets will be grandfathered and classified as purchased credit deteriorated (PCD) assets at the date of adoption. The asset will be grossed up for the allowance for expected credit losses for all PCD assets at the date of adoption and will continue to recognize the noncredit discount in interest income based on the yield such assets as of the adoption date. Subsequent changes in expected credit losses will be recorded through the allowance. For all other assets with the scope of CECL, the cumulative effect adjustment will be recognized in retained earnings as of the beginning of the first reporting period in which the guidance is effective. In November 2018, the FASB issued ASU 2018-19, Codification Improvements to Topic 326, Financial Instruments—Credit Losses, which clarify that receivables arising from operating leases are not within the scope of Subtopic 326-20. Instead, impairment of receivables arising from operating leases should be accounted for in accordance with Topic 842, Leases. The Company formed a CECL implementation committee in 2018 which prepared a project plan to migrate towards the adoption date. As part of the project plan, the Company contracted a third-party vendor to assist in the application and analysis of ASU 2016-13 as well as a third party vendor to perform an independent model validation. As part of this process, the Company has determined preliminary loan pool segmentation under CECL, as well as evaluated the key economic loss drivers for each segment. The Company operationalized an initial CECL model during the second quarter of 2019 and is running this preliminary CECL model alongside the existing incurred loss methodology. The Company intends to continue to refine and run the model until the expected adoption date on January 1, 2023. The Company continues to evaluate the effects of ASU 2016-13 on its financial statements and disclosures. In March 2020, the FASB issued ASU 2020-04, Reference Rate Reform (Topic 848): Facilitation of the Effects of Reference Rate Reform on Financial Reporting (or “ASU 2020-04”), which provides temporary, optional guidance to ease the potential burden in accounting for, or recognizing the effects of, the transition away from the London Interbank Offered Rate (or “LIBOR”) or other interbank offered rate (reference rates) on financial reporting. On March 5, 2021, the U.K. Financial Conduct Authority, the regulatory supervisor for ICE Benchmark Administration, the administrator of LIBOR, announced that the overnight and one, three, six and twelve month USD LIBOR will be discontinued on June 30, 2023. It was originally expected that LIBOR would be discontinued by the end of 2021. To help with the transition to new reference rates, the ASU provides optional expedients and exceptions for applying GAAP to affected contract modifications and hedge accounting relationships. The guidance is applicable only to contracts or hedge accounting relationships that reference LIBOR or another reference rate expected to be discontinued. The expedients and exceptions in this update are available to all entities starting March 12, 2020 through December 31, 2022. In January 2020, the FASB issued ASU 2021-01, Reference Rate Reform (Topic 848), which clarifies the scope of Topic 848 to include derivative instruments impacted by discounting transition. The Company has created a subcommittee of the Asset Liability Management Committee to address the LIBOR transition and phase-out issues. The Company has identified its LIBOR-based contracts that will be impacted by the transition away from of LIBOR, and is incorporating fallback language in negotiated contracts and incorporating non-LIBOR reference rate and/or fallback language in new contracts to prepare for these changes. The Company is evaluating the impact that ASU 2020-04 will have on those financial assets where LIBOR is used as an index rate. Except for the updated standards discussed above, there have been no new accounting pronouncements not yet effective that have significance, or potential significance, to the Company’s consolidated financial statements.

Securities

12 Months Ended

Dec. 31, 2021

Investments, Debt and Equity Securities [Abstract]

Securities

The fair value of available-for-sale securities and their related gross unrealized gains and losses at the dates indicated are as follows:


	Available-for-sale securities
	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses		Fair Value

	(Dollars in thousands)
December 31, 2021

U.S. agency securities - excluding mortgage-backed securities	$	1,177,452	$	7,320	$	(6,005)	$	1,178,767
Residential mortgage-backed securities:
Government agency mortgage-backed securities	1,428,365		130		(14,378)		1,414,117
Government agency collateralized mortgage obligation	1,659,125		1,617		(15,739)		1,645,003
Private-label collateralized mortgage obligation	1,425		19		(11)		1,433
Commercial mortgage-backed securities:
Government agency mortgage-backed securities	1,106,680		1,886		(4,962)		1,103,604
Government agency collateralized mortgage obligation	212,266		19		(1,370)		210,915
Private-label collateralized mortgage obligation	144,204		227		(797)		143,634
Municipal bonds:
Tax-exempt	2,272,794		33,153		(8,210)		2,297,737
Taxable	403,279		341		(6,016)		397,604
Asset backed securities:
Government sponsored student loan pools	233,374		97		(1,026)		232,445
	$	8,638,964	$	44,809	$	(58,514)	$	8,625,259


	Available-for-sale securities
	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses		Fair Value

	(Dollars in thousands)
December 31, 2020


Residential mortgage-backed securities:
Government agency mortgage-backed securities	$	5,701	$	18	$	(55)	$	5,664
Government agency collateralized mortgage obligation	197,978		371		(298)		198,051
Private-label collateralized mortgage obligation	20,544		399		(256)		20,687
Commercial mortgage-backed securities:


Private-label collateralized mortgage obligation	164,214		18,322		—		182,536
Municipal bonds:
Tax-exempt	246,159		24,200		—		270,359
Taxable	15,307		695		—		16,002
Asset backed securities:
Government sponsored student loan pools	248,848		17		(3,149)		245,716
	$	898,751	$	44,022	$	(3,758)	$	939,015

There were no investment securities pledged for borrowings or for other purposes as required or permitted by law as of December 31, 2021 and 2020.

Securities with unrealized losses as of the dates indicated, aggregated by investment category and length of time that individual securities have been in a continuous unrealized loss position, are as follows:


	Available-for-sale securities
	Less than 12 Months				12 Months or More				Total
	Fair Value		Unrealized Losses		Fair Value		Unrealized Losses		Fair Value		Unrealized Losses

	(Dollars in thousands)
December 31, 2021

U.S. agency securities - excluding mortgage-backed securities	$	761,711	$	(6,005)	$	—	$	—	$	761,711	$	(6,005)
Residential mortgage-backed securities:
Government agency mortgage-backed securities	1,357,080		(14,378)		70		—		1,357,150		(14,378)
Government agency collateralized mortgage obligation	1,513,388		(15,732)		650		(7)		1,514,038		(15,739)
Private-label collateralized mortgage obligation	—		—		433		(11)		433		(11)
Commercial mortgage-backed securities:
Government agency mortgage-backed securities	435,055		(4,962)		—		—		435,055		(4,962)
Government agency collateralized mortgage obligation	189,397		(1,370)		—		—		189,397		(1,370)
Private-label collateralized mortgage obligation	98,173		(656)		6,791		(141)		104,964		(797)
Municipal bonds:
Tax-exempt	1,025,689		(8,210)		—		—		1,025,689		(8,210)
Taxable	339,041		(6,016)		—		—		339,041		(6,016)
Asset backed securities:
Government sponsored student loan pools	168,204		(803)		32,783		(223)		200,987		(1,026)
	$	5,887,738	$	(58,132)	$	40,727	$	(382)	$	5,928,465	$	(58,514)


	Available-for-sale securities
	Less than 12 Months				12 Months or More				Total
	Fair Value		Unrealized Losses		Fair Value		Unrealized Losses		Fair Value		Unrealized Losses

	(Dollars in thousands)
December 31, 2020


Residential mortgage-backed securities:
Government agency mortgage-backed securities	$	5,165	$	(55)	$	—	$	—	$	5,165	$	(55)
Government agency collateralized mortgage obligation	120,912		(172)		56,976		(126)		177,888		(298)
Private-label collateralized mortgage obligation	290		(7)		9,950		(249)		10,240		(256)




Asset backed securities:
Government sponsored student loan pools	—		—		240,825		(3,149)		240,825		(3,149)
	$	126,367	$	(234)	$	307,751	$	(3,524)	$	434,118	$	(3,758)

As indicated in the tables above, as of December 31, 2021, the Company’s investment securities had gross unrealized losses totaling approximately $58.5 million, compared to approximately $3.8 million at December 31, 2020. The Company analyzes all of its securities with an unrealized loss position. For each security, the Company analyzed the credit quality and performed a projected cash flow analysis. In analyzing the credit quality, management may consider whether the securities are issued by the federal government, its agencies or its sponsored entities, or non-governmental entities, whether downgrades by

bond rating agencies have occurred, and if credit quality has deteriorated. When performing a cash flow analysis the Company uses models that project prepayments, default rates, and loss severities on the collateral supporting the security, based on underlying loan level borrower and loan characteristics and interest rate assumptions. Based on these analyses and reviews conducted by the Company, and assisted by independent third parties, the Company determined that none of its securities required an other-than-temporary impairment charge at December 31, 2021 or December 31, 2020. Management continues to expect to recover the adjusted amortized cost basis of these bonds.

As of December 31, 2021, the Company had 323 securities whose estimated fair value declined 0.98% from the Company’s amortized cost; at December 31, 2020, the Company had 30 securities whose estimated fair value declined 0.86% from the Company’s amortized cost. These unrealized losses on securities are primarily due to widening of credit spreads or changes in market interest rates since their purchase dates. Current unrealized losses are expected to recover as the securities approach their respective maturity dates. Management believes it will more than likely not be required to sell before recovery of the amortized cost basis.

For the year ended December 31, 2021 the Company received $1.5 billion in proceeds, recognized $15.9 million in gains and $10.6 million in losses on sales of available for sale securities. For the year ended December 31, 2020 the Company received $216.4 million in proceeds, recognized $4.7 million in gains and $0.9 million in losses on sales of securities. The tax expense related to the net realized gains and losses were $1.5 million and $1.3 million for the years ended December 31, 2021 and 2020 respectively.

There were no credit losses associated with our securities portfolio recognized in earnings for the years ended December 31, 2021 and 2020.

The amortized cost and estimated fair value of investment securities as of the periods presented by contractual maturity are shown below. Expected maturities may differ from contractual maturities if borrowers have the right to call or prepay obligations with or without call or prepayment penalties. For purposes of the following table, the entire outstanding balance of residential and commercial mortgage-backed securities is categorized based on the final maturity date.


	December 31,
	2021				2020
	Amortized Cost		Fair Value		Amortized Cost		Fair Value

	(Dollars in thousands)
Available-for-sale securities
Within one year	$	—	$	—	$	—	$	—
After one year through five years	2,243		2,170		—		—
After five years through ten years	1,406,395		1,401,733		14,021		15,694
After ten years	7,230,326		7,221,356		884,730		923,321
Total	$	8,638,964	$	8,625,259	$	898,751	$	939,015

Loans

12 Months Ended

Dec. 31, 2021

Receivables [Abstract]

Loans

The following disclosure reports the Company’s loan portfolio segments and classes. Segments are groupings of similar loans at a level in which the Company has adopted systematic methods of documentation for determining its allowance for loan and credit losses. Classes are a disaggregation of the portfolio segments. The Company’s loan portfolio segments are:

Real estate. Real estate loans include loans for which the Company holds one-to-four family, multi-family, commercial and construction real property as collateral. One-to-four family real estate loans primarily consist of non-qualified single-family residential mortgage loans and purchases of loan pools. Multi-family real estate loans have been offered for the purchase or refinancing of apartment properties located primarily in the Southern California market area. Commercial real estate lending activity has historically been primarily focused on investor properties that are owned by customers with a current banking relationship. The primary risks of real estate mortgage loans include the borrower’s inability to pay, material decreases in the value of the real estate that is being held as collateral and significant increases in interest rates, which may make the real estate mortgage loan unprofitable. Real estate loans also may be adversely affected by conditions in the real estate markets or in the general economy.

Commercial and industrial. Commercial and industrial loans consist of U.S. dollar denominated loans to businesses that are collateralized almost exclusively by bitcoin or U.S. dollars, also known as our core lending product, SEN Leverage. Commercial and industrial loans may also consist of loans and lines of credit to businesses that are generally collateralized by accounts receivable, inventory, equipment, loan and lease receivables and other commercial assets, and may be supported by other credit enhancements such as personal guarantees. Risks may arise from differences between expected and actual cash flows and/or liquidity levels of the borrowers, as well as the type of collateral securing these loans and the reliability of the

conversion thereof to cash. Borrowers accessing SEN Leverage provide bitcoin or U.S. dollars as collateral in an amount greater than the line of credit eligible to be advanced. The Bank works with regulated digital currency exchanges and other indirect lenders, as the case may be, to both act as its collateral custodian for such loans, and to liquidate the collateral in the event of a decline in collateral coverage below levels required in the borrower’s loan agreement. At no time does the Bank directly hold the pledged bitcoin digital currency. The Bank sets collateral coverage ratios at levels intended to yield collateral liquidation proceeds in excess of the borrower’s loan amount, but the borrower remains obligated for the payment of any deficiency notwithstanding any change in the condition of the exchange, financial or otherwise. The outstanding balance of gross SEN Leverage loans was $335.9 million and $77.2 million at December 31, 2021 and 2020, respectively.

Reverse mortgage and other. From 2012 to 2014, the Company purchased home equity conversion mortgage (“HECM”) loans (also known as reverse mortgage loans) which are a special type of home loan, for homeowners aged 62 years or older, that requires no monthly mortgage payments and allows the borrower to receive payments from the lender. Reverse mortgage loan insurance is provided by the U. S. Federal Housing Administration through the HECM program which protects lenders from losses due to non-repayment of the loans when the outstanding loan balance exceeds collateral value at the time the loan is required to be repaid. Other loans consist of consumer loans and loans secured by personal property.

Mortgage warehouse. The Company’s mortgage warehouse lending division provides short-term interim funding primarily for single-family residential mortgage loans originated by mortgage bankers or other lenders. The Company holds legal title to such loans from the date they are funded by the Company until the loans are sold to secondary market investors pursuant to pre-existing take out commitments, generally within a few weeks of origination, with loan sale proceeds applied to pay down Company funding. The Company’s mortgage warehouse loans may either be held-for-investment or held-for-sale depending on the underlying contract. At December 31, 2021 and 2020, gross mortgage warehouse loans were approximately $1.1 billion and $963.9 million, respectively.

A summary of loans as of the periods presented are as follows:


	December 31,
	2021		2020

	(Dollars in thousands)
Real estate loans:
One-to-four family	$	105,098	$	187,855
Multi-family	56,751		77,126
Commercial	210,136		301,901
Construction	7,573		6,272
Commercial and industrial	335,862		78,909

Reverse mortgage and other	1,410		1,495
Mortgage warehouse	177,115		97,903
Total gross loans held-for-investment	893,945		751,461
Deferred fees, net	275		2,206
Total loans held-for-investment	894,220		753,667
Allowance for loan losses	(6,916)		(6,916)
Total loans held-for-investment, net	$	887,304	$	746,751
Total loans held-for-sale(1)	$	893,194	$	865,961

________________________

(1)Loans held-for-sale are comprised entirely of mortgage warehouse loans for all periods presented

At December 31, 2021 and 2020, approximately $381.0 million and $574.5 million, respectively, of the Company’s gross loans held-for-investment was collateralized by various forms of real estate, primarily located in California. Real estate loans may be more adversely affected by conditions in the real estate markets or in the general economy. At December 31, 2021 and 2020, approximately $335.9 million and $77.2 million, respectively, of the Company’s gross loans held-for-investment was collateralized primarily by bitcoin and U.S. dollars. The loan to value ratio of these loans fluctuates in relation to value of bitcoin held as collateral, which may be volatile and there is no assurance that customers will be able to timely provide additional collateral under these loans in a scenario where the value of the bitcoin drops precipitously. The Company monitors and manages concentrations of credit risk by making loans that are diversified by collateral type, placing limits on the amounts of various categories of loans relative to total Company capital, and conducting quarterly reviews of its portfolio by collateral type, geography, and other characteristics.

Recorded investment in loans excludes accrued interest receivable due to immateriality. Accrued interest on loans held-for-investment totaled approximately $3.3 million and $2.7 million at December 31, 2021 and 2020, respectively.

Allowance for Loan Losses

The following tables present the allocation of the allowance for loan losses, as well as the activity in the allowance by loan class, and recorded investment in loans held-for-investment as of and for the periods presented:


	Year Ended December 31, 2021
	One-to -Four Family		Multi- Family		Commercial Real Estate		Construction		Commercial and Industrial		Reverse Mortgage and Other		Mortgage Warehouse		Total

	(Dollars in thousands)
Balance, December 31, 2020	$	1,245	$	878	$	1,810	$	590	$	1,931	$	39	$	423	$	6,916
Charge-offs	—		—		—		—		—		—		—		—
Recoveries	—		—		—		—		—		—		—		—
Provision for loan losses	(222)		(196)		207		186		(365)		(27)		417		—
Balance, December 31, 2021	$	1,023	$	682	$	2,017	$	776	$	1,566	$	12	$	840	$	6,916


	December 31, 2021
	One-to -Four Family		Multi- Family		Commercial Real Estate		Construction		Commercial and Industrial		Reverse Mortgage and Other		Mortgage Warehouse		Total

	(Dollars in thousands)
Amount of allowance attributed to:
Specifically evaluated impaired loans	$	29	$	—	$	—	$	—	$	—	$	—	$	—	$	29
General portfolio allocation	994		682		2,017		776		1,566		12		840		6,887
Total allowance for loan losses	$	1,023	$	682	$	2,017	$	776	$	1,566	$	12	$	840	$	6,916
Loans evaluated for impairment:
Specifically evaluated	$	4,229	$	—	$	1,956	$	—	$	—	$	923	$	—	$	7,108
Collectively evaluated	101,609		56,855		208,170		7,502		335,362		499		177,115		887,112
Total loans held-for-investment	$	105,838	$	56,855	$	210,126	$	7,502	$	335,362	$	1,422	$	177,115	$	894,220


	Year Ended December 31, 2020
	One-to -Four Family		Multi- Family		Commercial Real Estate		Construction		Commercial and Industrial		Reverse Mortgage and Other		Mortgage Warehouse		Total

	(Dollars in thousands)
Balance, December 31, 2019	$	2,051	$	653	$	2,791	$	96	$	312	$	38	$	250	$	6,191
Charge-offs	(17)		—		—		—		—		—		—		(17)
Recoveries	—		—		—		—		—		—		—		—
Provision for loan losses	(789)		225		(981)		494		1,619		1		173		742
Balance, December 31, 2020	$	1,245	$	878	$	1,810	$	590	$	1,931	$	39	$	423	$	6,916


	December 31, 2020
	One-to -Four Family		Multi- Family		Commercial Real Estate		Construction		Commercial and Industrial		Reverse Mortgage and Other		Mortgage Warehouse		Total

	(Dollars in thousands)
Amount of allowance attributed to:
Specifically evaluated impaired loans	$	11	$	—	$	—	$	—	$	—	$	29	$	—	$	40
General portfolio allocation	1,234		878		1,810		590		1,931		10		423		6,876
Total allowance for loan losses	$	1,245	$	878	$	1,810	$	590	$	1,931	$	39	$	423	$	6,916
Loans evaluated for impairment:
Specifically evaluated	$	5,795	$	—	$	9,713	$	—	$	274	$	879	$	—	$	16,661
Collectively evaluated	184,405		77,288		292,367		6,137		78,275		631		97,903		737,006
Total loans held-for-investment	$	190,200	$	77,288	$	302,080	$	6,137	$	78,549	$	1,510	$	97,903	$	753,667

Impaired Loans

The following tables provide a summary of the Company’s investment in impaired loans as of and for the year then ended:


	December 31, 2021
	Unpaid Principal Balance		Recorded Investment		Related Allowance		Average Recorded Investment		Interest Income Recognized

	(Dollars in thousands)
With no related allowance recorded:
Real estate loans:
One-to-four family	$	4,616	$	3,927	$	—	$	5,719	$	303

Commercial	1,955		1,956		—		7,906		477

Commercial and industrial	—		—		—		182		15

Reverse mortgage and other	914		923		—		825		—

	7,485		6,806		—		14,632		795
With an allowance recorded:
Real estate loans:
One-to-four family	323		302		29		258		12





Reverse mortgage and other	—		—		—		65		—

	323		302		29		323		12
Total impaired loans	$	7,808	$	7,108	$	29	$	14,955	$	807


	December 31, 2020
	Unpaid Principal Balance		Recorded Investment		Related Allowance		Average Recorded Investment		Interest Income Recognized

	(Dollars in thousands)
With no related allowance recorded:
Real estate loans:
One-to-four family	$	6,432	$	5,730	$	—	$	3,748	$	215

Commercial	9,723		9,713		—		4,620		522

Commercial and industrial	274		274		—		1,680		25

Reverse mortgage and other	523		531		—		516		—

	16,952		16,248		—		10,564		762
With an allowance recorded:
Real estate loans:
One-to-four family	64		65		11		65		5





Reverse mortgage and other	346		348		29		342		—

	410		413		40		407		5
Total impaired loans	$	17,362	$	16,661	$	40	$	10,971	$	767

For purposes of this disclosure, the unpaid principal balance is not reduced for partial charge-offs. Cash basis interest income is not materially different than interest income recognized.

Nonaccrual and Past Due Loans

Nonperforming loans include individually evaluated impaired loans, loans for which the accrual of interest has been discontinued and loans 90 days or more past due and still accruing interest.

The following tables present by loan class the aging analysis based on contractual terms, nonaccrual loans, and the Company’s recorded investment in loans held-for-investment as of the periods presented:


	December 31, 2021
	30-59 Days Past Due		60-89 Days Past Due		Greater than 89 Days Past Due		Total Past Due		Current		Total		Nonaccruing		Loans Receivable > 89 Days and Accruing

	(Dollars in thousands)
Real estate loans:
One-to-four family	$	1,176	$	—	$	2,985	$	4,161	$	101,677	$	105,838	$	3,080	$	—
Multi-family	—		—		—		—		56,855		56,855		—		—
Commercial	—		—		—		—		210,126		210,126		—		—
Construction	—		—		—		—		7,502		7,502		—		—
Commercial and industrial	—		—		—		—		335,362		335,362		—		—

Reverse mortgage and other	—		—		—		—		1,422		1,422		923		—
Mortgage warehouse	—		—		—		—		177,115		177,115		—		—
Total loans held-for-investment	$	1,176	$	—	$	2,985	$	4,161	$	890,059	$	894,220	$	4,003	$	—


	December 31, 2020
	30-59 Days Past Due		60-89 Days Past Due		Greater than 89 Days Past Due		Total Past Due		Current		Total		Nonaccruing		Loans Receivable > 89 Days and Accruing

	(Dollars in thousands)
Real estate loans:
One-to-four family	$	1,006	$	26	$	3,866	$	4,898	$	185,302	$	190,200	$	4,105	$	—
Multi-family	206		—		—		206		77,082		77,288		—		—
Commercial	—		—		—		—		302,080		302,080		—		—
Construction	—		—		—		—		6,137		6,137		—		—
Commercial and industrial	—		—		—		—		78,549		78,549		—		—

Reverse mortgage and other	—		—		—		—		1,510		1,510		879		—
Mortgage warehouse	—		—		—		—		97,903		97,903		—		—
Total loans held-for-investment	$	1,212	$	26	$	3,866	$	5,104	$	748,563	$	753,667	$	4,984	$	—

Troubled Debt Restructurings

A loan is identified as a troubled debt restructuring (“TDR”) when a borrower is experiencing financial difficulties and, for economic or legal reasons related to these difficulties, the Company grants a concession to the borrower in the restructuring that it would not otherwise consider. In order to determine whether a borrower is experiencing financial difficulty, an evaluation is performed of the probability that the borrower will be in payment default on any of its debt in the foreseeable future without the modification. The Company has granted a concession when, as a result of the restructuring, it does not expect to collect all amounts due or within the time periods originally due under the original contract, including one or a combination of the following: a reduction of the stated interest rate of the loan; an extension of the maturity date at a stated rate of interest lower than the current market rate for new debt with similar risk; or a temporary forbearance with regard to the payment of principal or interest. All troubled debt restructurings are reviewed for potential impairment. Generally, a nonaccrual loan that is restructured remains on nonaccrual status for a minimum period of six months to demonstrate that the borrower can perform under the restructured terms. If the borrower’s performance under the new terms is not reasonably assured, the loan remains classified as a nonaccrual loan. Loans classified as TDRs are reported as impaired loans.

As of December 31, 2021 and 2020, the Company had a recorded investment in TDRs of $1.7 million and $1.5 million, respectively. The Company has allocated $29,000 of specific allowance for those loans at December 31, 2021 and $11,000 at December 31, 2020. The Company has not committed to advance additional amounts on these TDRs. No loans were modified as TDRs during the year ended December 31, 2020.

Modifications of loans classified as TDRs during the periods presented, are as follows:

Year Ended December 31, 2021

Number of
Loans

Pre-
Modifications
Outstanding
Recorded
Investment

Post-
Modifications
Outstanding
Recorded
Investment

(Dollars in thousands)

Troubled debt restructurings:

Real estate loans:

One-to-four family

2

$

547

$

590

The TDR’s described above increased the allowance for loan losses by $19,000 and had no impact to charge-offs during the year ended December 31, 2021.

A loan is considered to be in payment default once it is 30 days contractually past due under the modified terms. There were no loans modified as TDRs for which there was a payment default within twelve months during the year ended December 31, 2021 or 2020. There was no provision for loan loss or charge offs for TDR’s that subsequently defaulted during the year ended December 31, 2021 or 2020.

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, collateral adequacy, credit documentation, and current economic trends, among other factors. This analysis typically includes larger, nonhomogeneous loans such as commercial real estate and commercial and industrial loans. This analysis is performed on an ongoing basis as new information is obtained. The Company uses the following definitions for risk ratings:


Pass:						Loans in all classes that are not adversely rated, are contractually current as to principal and interest, and are otherwise in compliance with the contractual terms of the loan agreement. Management believes that there is a low likelihood of loss related to those loans that are considered pass.

Special mention:						Loans classified as special mention have a potential weakness that deserves management’s close attention. If left uncorrected, these potential weaknesses may result in deterioration of the repayment prospects for the loan or of the institution’s credit position at some future date.

Substandard:						Loans classified as substandard are inadequately protected by the current net worth and paying capacity of the obligor or of the collateral pledged, if any. Loans so classified have a well-defined weakness or weaknesses that jeopardize the liquidation of the debt. They are characterized by the distinct possibility that the Company will sustain some loss if the deficiencies are not corrected.

Doubtful:						Loans classified as doubtful have all the weaknesses inherent in those classified as substandard, with the added characteristic that the weaknesses make collection or liquidation in full, on the basis of currently existing facts, conditions, and values, highly questionable and improbable.

Loss:						Credits rated as loss are charged-off. Management has no expectation of the recovery of any payments in respect of credits rated as loss.

The following tables present by portfolio class the Company’s internal risk grading system as well as certain other information concerning the credit quality of the Company’s recorded investment in loans held-for-investment as of the periods presented. No assets were classified as loss or doubtful during the periods presented.


	Credit Risk Grades
	Pass		Special Mention		Substandard		Doubtful		Total

	(Dollars in thousands)
December 31, 2021
Real estate loans:
One-to-four family	$	102,307	$	451	$	3,080	$	—	$	105,838
Multi-family	56,855		—		—		—		56,855
Commercial	199,598		10,528		—		—		210,126
Construction	7,502		—		—		—		7,502
Commercial and industrial	335,362		—		—		—		335,362

Reverse mortgage and other	499		—		923		—		1,422
Mortgage warehouse	177,115		—		—		—		177,115
Total loans held-for-investment	$	879,238	$	10,979	$	4,003	$	—	$	894,220


	Credit Risk Grades
	Pass		Special Mention		Substandard		Doubtful		Total

	(Dollars in thousands)
December 31, 2020
Real estate loans:
One-to-four family	$	182,760	$	3,335	$	4,105	$	—	$	190,200
Multi-family	77,288		—		—		—		77,288
Commercial	288,471		5,854		7,755		—		302,080
Construction	6,137		—		—		—		6,137
Commercial and industrial	78,275		—		274		—		78,549

Reverse mortgage and other	631		—		879		—		1,510
Mortgage warehouse	97,903		—		—		—		97,903
Total loans held-for-investment	$	731,465	$	9,189	$	13,013	$	—	$	753,667

Purchases and Sales

The following table presents loans held-for-investment purchased and/or sold during the year by portfolio segment:


	December 31,
	2021				2020
	Purchases		Sales		Purchases		Sales

	(Dollars in thousands)
Real estate loans:
One-to-four family	$	—	$	—	$	89,873	$	—
Multi-family	1,040		—		—		—






	$	1,040	$	—	$	89,873	$	—

Related Party Loans

The Company had related-party loans with an outstanding balance of $7.7 million and $5.0 million as of December 31, 2021 and 2020, respectively. During the year ended December 31, 2021, the Company advanced $5.3 million of related party loans and received $2.7 million in principal payments. During the year ended December 31, 2020, the Company advanced $0.5 million of related party loans and received $0.1 million in principal payments.

Premises and Equipment, Net

12 Months Ended

Dec. 31, 2021

Property, Plant and Equipment [Abstract]

Premises and Equipment, Net

Year-end premises and equipment were as follows:


	December 31,
	2021		2020

	(Dollars in thousands)
Equipment, furniture, and software	$	8,286	$	6,381
Leasehold improvements	1,372		1,372

	9,658		7,753
Accumulated depreciation and amortization	(6,650)		(5,681)
Total premises and equipment, net	$	3,008	$	2,072

Depreciation expense was $1.0 million and $2.1 million for years ended December 31, 2021 and 2020, respectively. Depreciation expense during the year ended December 31, 2020, included $0.9 million related to disposal of furniture, equipment and leasehold improvements no longer in use.

Operating leases

The Company leases all of its office facilities under operating lease arrangements. Leases are typically payable in monthly installments with original lease terms ranging from 12 to 84 months and may contain renewal options. The leases provide that the Company pays real estate taxes, insurance, and certain other operating expenses applicable to the leased premises in addition to the monthly minimum payments. In the fourth quarter of 2020, the Company consolidated its branch and headquarters offices into one floor and recorded an impairment of the right-of-use assets no longer in use.

Supplemental balance sheet information related to leases were as follows:


		December 31,
		2021		2020

		(Dollars in thousands)
Operating leases	Balance Sheet Classification
Right-of-use assets	Other assets	$	4,457	$	1,799
Lease liabilities	Accrued expenses and other liabilities	5,233		3,376

The weighted-average remaining lease term and discount rate were as follows:


	December 31,
	2021		2020
Weighted-average remaining lease term	4.7 years		2.0 years
Weighted-average discount rate	4.70	%	4.21	%

The components of lease expense for the periods presented were as follows:


	Year Ended December 31,
	2021		2020

	(Dollars in thousands)
Operating lease costs(1)	$	973	$	2,943
Short-term lease costs(2)	40		102
Variable lease costs	39		77
Less: Sublease income	(201)		(155)
Total lease costs	$	851	$	2,967

________________________

(1)Includes a $1.4 million impairment charge related to leased office space no longer in use for the year ended December 31, 2020.

(2)Short-term lease costs are for leases with a term of one year or less including terms of one month or less per accounting policy election.

Maturities of lease liabilities were as follows:


	December 31, 2021
Operating leases	(Dollars in thousands)
2022	$	1,513
2023	991
2024	815
2025	820
2026	857
Thereafter	741
Total lease payments	5,737
Less: imputed lease interest	(504)
Total lease liabilities	$	5,233

As of December 31, 2021 and 2020, the Company had no additional operating lease commitments for office facilities that have not yet commenced. Cash paid for amounts included in the measurement of operating lease liabilities was $1.8 million and $1.7 million for the years ended December 31, 2021 and 2020, respectively.

Deposits

12 Months Ended

Dec. 31, 2021

Deposits [Abstract]

Deposits

The following table presents the composition of our deposits as of the dates presented:


	December 31,
	2021		2020

	(Dollars in thousands)
Noninterest bearing demand accounts	$	14,213,472	$	5,133,579
Interest bearing accounts:
Interest bearing demand accounts	7,455		42,143
Money market and savings accounts	69,161		71,460
Certificates of deposit	540		844
Interest bearing accounts	77,156		114,447





Total deposits	$	14,290,628	$	5,248,026

Certificates of deposit at December 31, 2021, are scheduled to mature as follows:


	Amount
Year Ended December 31,	(Dollars in thousands)
2022	$	448
2023	39
2024	53


Thereafter	—
Total	$	540

There were no certificates of deposit that met or exceeded the FDIC insurance limit of $250,000 at December 31, 2021 or 2020.

Deposits from officers, directors, and affiliates at December 31, 2021 and 2020, were approximately $0.5 million and $1.2 million, respectively.

The Bank’s 10 largest depositors accounted for $6.5 billion in deposits, or approximately 45.3% of total deposits at December 31, 2021 compared to $2.5 billion in deposits, or approximately 47.5% of total deposits at December 31, 2020, substantially all of which are customers operating in the digital currency industry. Deposits from digital currency exchanges represent approximately 58.0% of the Bank’s total deposits and are held by approximately 94 exchanges at December 31, 2021 compared to 47.2% of total deposits, held by 76 exchanges at December 31, 2020.

FHLB Advances and Other Borrowings	12 Months Ended
FHLB Advances and Other Borrowings	Dec. 31, 2021
Debt Disclosure [Abstract]
FHLB Advances and Other Borrowings	FHLB Advances and Other Borrowings FHLB Advances FHLB advances or borrowing capacity can be secured with eligible collateral consisting of qualifying real estate loans or certain securities. Advances from the FHLB are subject to the FHLB’s collateral and underwriting requirements, and as of December 31, 2021 and 2020, were limited in the aggregate to 35% of the Bank’s total assets. Loans with carrying values of approximately $1.4 billion and $1.5 billion were pledged to the FHLB as of December 31, 2021 and 2020, respectively. Unused borrowing capacity based on the lesser of the percentage of total assets and pledged collateral was approximately $973.9 million and $893.0 million as of December 31, 2021 and 2020, respectively. At December 31, 2021 and 2020, there were no FHLB advances outstanding. FRB Advances The Bank is also approved to borrow through the Discount Window of the Federal Reserve Bank of San Francisco on a collateralized basis without any fixed dollar limit. Loans with a carrying value of approximately $6.0 million and $6.3 million were pledged to the FRB at December 31, 2021 and 2020, respectively. The Bank’s borrowing capacity under the Federal Reserve’s discount window program was $5.2 million as of December 31, 2021. At December 31, 2021 and 2020, there were no FRB advances outstanding. Federal Funds Purchased The Bank may borrow up to an aggregate $108.0 million, overnight on an unsecured basis from two of its correspondent banks. Access to these funds is subject to liquidity availability, market conditions and any negative material change in the Bank’s credit profile. As of December 31, 2021 and 2020, the Company had no outstanding balance of federal funds purchased.

Subordinated Debentures, Net	12 Months Ended
Subordinated Debentures, Net	Dec. 31, 2021
Subordinated Debentures
Debt Instrument [Line Items]
Subordinated Debentures, Net	Subordinated Debentures, Net A trust formed by the Company issued $12.5 million of floating rate trust preferred securities in July 2001 as part of a pooled offering of such securities. The Company issued subordinated debentures to the trust in exchange for its proceeds from the offering. The debentures and related accrued interest represent substantially all of the assets of the trust. The subordinated debentures bear interest at six-month LIBOR plus 375 basis points, which adjusts every six months in January and July of each year. Interest is payable semiannually. At December 31, 2021, the interest rate for the Company’s next scheduled payment was 3.91%, based on six-month LIBOR of 0.16%. On any January 25 or July 25 the Company may redeem the 2001 subordinated debentures at 100% of principal amount plus accrued interest. The 2001 subordinated debentures mature on July 25, 2031. A second trust formed by the Company issued $3.0 million of trust preferred securities in January 2005 as part of a pooled offering of such securities. The Company issued subordinated debentures to the trust in exchange for its proceeds from the offering. The debentures and related accrued interest represent substantially all of the assets of the trust. The subordinated debentures bear interest at three-month LIBOR plus 185 basis points, which adjusts every three months. Interest is payable quarterly. At December 31, 2021, the interest rate for the Company’s next scheduled payment was 2.05%, based on three-month LIBOR of 0.20%. On the 15th day of any March, June, September, or December, the Company may redeem the 2005 subordinated debentures at 100% of principal amount plus accrued interest. The 2005 subordinated debentures mature on March 15, 2035. The Company also retained a 3% minority interest in each of these trusts which is included in subordinated debentures. The balance of the equity in the trusts is comprised of mandatorily redeemable preferred securities. The subordinated debentures may be included in Tier I capital (with certain limitations applicable) under current regulatory guidelines and interpretations. The Company has the right to defer interest payments on the subordinated debentures from time to time for a period not to exceed five years. The outstanding balance of the subordinated debentures was $15.8 million, net of $0.1 million unamortized debt issuance cost as of December 31, 2021 and 2020.

Derivative and Hedging Activities

12 Months Ended

Dec. 31, 2021

Derivative Instruments and Hedging Activities Disclosure [Abstract]

Derivative and Hedging Activities

Derivative and Hedging ActivitiesThe Company is exposed to certain risks relating to its ongoing business operations. The Company utilizes interest rate derivatives as part of its asset liability management strategy to help manage its interest rate risk position. The notional amount of the derivative does not represent amounts exchanged by the parties. The amount exchanged is determined by reference to the notional amount and the other terms of the individual derivative agreements. In accordance with accounting guidance, changes in the fair value of derivatives designated and that qualify as cash flow hedges are initially recorded in other comprehensive income (“OCI”), reclassified into earnings in the same period or periods during which the hedged transaction affects earnings and is presented in the same income statement line item as the earnings effect of the hedged item. The Company assesses the effectiveness of each hedging relationship by comparing the changes in cash flows of the derivative hedging instrument with

the changes in cash flows of the designated hedged transactions. For cash flow and fair value hedges, the initial fair value of hedge components excluded from the assessment of effectiveness is recognized in earnings under a systematic and rational method over the life of the hedging instrument and is presented in the same income statement line item as the earnings effect of the hedged item. Any difference between the change in the fair value of the hedge components excluded from the assessment of effectiveness and the amounts recognized in earnings is recorded as a component of other comprehensive income. For a fair value hedge, the gain or loss on the derivative as well as the offsetting loss or gain on the hedged item, are recognized in current earnings as fair values change. The changes in fair value of the hedged item is recorded as a basis adjustment to the hedged assets or liabilities. The amount included as basis adjustments would be reclassified to current earnings on a straight-line basis over the original life of the hedged item should the hedges no longer be considered effective.

Interest rate swaps. In 2020, the Company entered into two pay-fixed/receive floating rate interest rate swaps (the “Swap Agreements”) for a notional amount of $14.3 million that were designated as fair value hedges of certain available-for-sale securities. The Swap Agreements were determined to be fully effective during the periods presented and therefore no amount of ineffectiveness has been included in net income. In October 2021, the Company sold the swaps and related securities, which resulted in a gain of $0.9 million related to the swaps to be recognized immediately. The gain was recorded in other noninterest income on the statement of operations. The Swap Agreements were based on three-month LIBOR and had original expiration dates in 2030 and 2031.

Interest rate floors. In 2019, the Company entered into 20 interest rate floor agreements (the “Floor Agreements”) for a total notional amount of $400.0 million to hedge cash flow receipts on cash and securities or loans, if needed. The original Floor Agreements expire on various dates in April 2024 and July 2029. The Company utilizes one-month LIBOR and three-month LIBOR interest rate floors as hedges against adverse changes in cash flows on the designated cash, securities or loans attributable to fluctuations in the federal funds rate or three-month LIBOR below 2.50% or 2.25%, as applicable. The Floor Agreements were determined to be fully effective during all periods presented and, as such, no amount of ineffectiveness has been included in net income. The upfront fee paid to the counterparty in entering into these Floor Agreements was approximately $20.8 million. During the three months ended March 31, 2020, the Company sold $200.0 million of its total $400.0 million notional amount of interest rate floors for $13.0 million, which resulted in a net gain of $8.4 million, to be recognized over the weighted average remaining term of 4.1 years. The remaining agreements are one-month LIBOR floors with a strike price of 2.25% and expire in July 2029.

Interest rate caps. In 2021, the Company entered into 26 interest rate cap agreements with a total notional amount of $552.8 million (“Federal Funds Rate Cap Agreements”). The Federal Funds Rate Cap Agreements are designated as fair value hedges against changes in the fair value of certain fixed rate tax-exempt municipal bonds. The Company utilizes the interest rate caps as hedges against adverse changes in interest rates on the designated securities attributable to fluctuations in the federal funds rate above 2.00%, as applicable. An increase in the benchmark interest rate hedged reduces the fair value of these assets. The Federal Funds Rate Cap Agreements expire on various dates from 2027 to 2032. The upfront fee paid to the counterparties was approximately $24.7 million. The Company expects the Federal Funds Rate Cap Agreements to remain effective during the remaining term of the respective agreements.

In 2012 the Company entered into a $12.5 million and a $3.0 million notional forward interest rate cap agreement (the “LIBOR Cap Agreements”) to hedge its variable rate subordinated debentures. The LIBOR Cap Agreements expire July 25, 2022 and March 15, 2022, respectively. The Company utilizes interest rate caps as hedges against adverse changes in cash flows on the designated preferred trusts attributable to fluctuations in three-month LIBOR beyond 0.50% for the $3.0 million subordinated debenture and six-month LIBOR beyond 0.75% for the $12.5 million subordinated debenture. The Cap Agreements were determined to be fully effective during all periods presented and, as such, no amount of ineffectiveness has been included in net income. The upfront fee paid to the counterparty in entering into these LIBOR Cap Agreements was approximately $2.5 million.

The table below presents the fair value of the Company’s derivative financial instruments as well as the classification within the consolidated statements of financial condition.

December 31,

2021

2020

Balance Sheet
Location

Fair Value

Balance Sheet
Location

Fair Value

(Dollars in thousands)

Derivatives designated as hedging instruments:

Cash flow hedge interest rate floor

Derivative assets

$

18,992

Derivative assets

$

30,766

Cash flow hedge interest rate cap

Derivative assets

—

Derivative assets

—

Fair value hedge interest rate swap

Derivative assets

—

Derivative assets

338

Fair value hedge interest rate cap

Derivative assets

15,064

Derivative assets

—

The following table presents the cumulative basis adjustments on hedged items designated as fair value hedges and the related amortized cost of those items as of the periods presented.


	Carrying Amount of the Hedged Asset (Liability)				Cumulative Amount of Fair Value Hedging Adjustments Included in the Carrying Amount of Hedged Assets/(Liabilities)
	December 31, 2021		December 31, 2020		December 31, 2021		December 31, 2020

	(Dollars in thousands)
Line Item in the Statement of Financial Condition of Hedged Item:
Securities available-for-sale	$	697,437	$	15,367	$	—	$	(278)

The following table summarizes the effects of derivatives in cash flow and fair value hedging relationships designated as hedging instruments on the Company’s OCI and consolidated statements of operations for the periods presented:


	Amount of Gain (Loss) Recognized in OCI				Location of Gain (Loss) Reclassified from Accumulated OCI into Income	Amount of Gain (Loss) Reclassified from Accumulated OCI into Income
	Year Ended December 31,					Year Ended December 31,
	2021		2020			2021		2020

	(Dollars in thousands)
Derivatives designated as hedging instruments:
Cash flow hedge interest rate floor	$	(1,483)	$	6,167	Interest income - Other interest earning assets	$	560	$	745
Cash flow hedge interest rate floor	(5,931)		17,949		Interest income - Taxable securities	4,303		2,910
Cash flow hedge interest rate cap	—		(297)		Interest expense - Subordinated debentures	(402)		(309)
Fair value hedge interest rate cap(1)	(7,951)		—

_______________________

(1)Represents amounts excluded from the assessment of effectiveness for which the difference between changes in fair value and periodic amortization is recorded in other comprehensive income.

The Company estimates that approximately $4.1 million of net derivative gain for cash flow hedges included in OCI will be reclassified into earnings within the next 12 months. No gain or loss was reclassified from OCI into earnings as a result of forecasted transactions that failed to occur during the periods presented.

The following table presents the effect of fair value hedge accounting on the Company’s consolidated statements of operations for the periods presented.


	Location and Amount of Gain or (Loss) Recognized in Income on Fair Value Hedging Relationships
	Year Ended December 31,
	2021				2020
	Interest income - Taxable securities		Interest income - Tax-exempt securities		Interest income - Taxable securities		Interest income - Tax-exempt securities

	(Dollars in thousands)
Total interest income presented in the statement of operations in which the effects of fair value hedges are recorded	$	36,094	$	17,301	$	17,465	$	5,062
Effects of fair value hedging relationships
Interest rate contracts:
Hedged items	$	(626)	$	—	$	(390)	$	—
Derivatives designated as hedging instruments	515		—		355		—
Amount excluded from effectiveness testing recognized in earnings based on amortization approach	—		(1,729)		—		—

Income Taxes

12 Months Ended

Dec. 31, 2021

Income Tax Disclosure [Abstract]

Income Taxes

Income tax expense consists of the following for the periods presented:


	Year Ended December 31,
	2021		2020

	(Dollars in thousands)
Current provision
Federal	$	3,556	$	3,441
State	4,391		2,121

	7,947		5,562
Federal deferred tax benefit	(614)		(286)
State deferred tax benefit	(458)		(120)

	(1,072)		(406)
Income tax expense	$	6,875	$	5,156

Comparison of the federal statutory income tax rates to the Company’s effective income tax rates for the periods presented is as follows:


	Year Ended December 31,
	2021				2020
	Amount		Rate		Amount		Rate

	(Dollars in thousands)
Statutory federal tax	$	17,935	21.0	%	$	6,551	21.0	%
State tax, net of federal benefit	3,208		3.8	%	1,687		5.4	%

Tax credits	(409)		(0.5)	%	(290)		(0.9)	%
Tax-exempt income, net	(3,998)		(4.7)	%	(1,063)		(3.4)	%
Excess tax benefit from stock-based compensation	(9,846)		(11.5)	%	(1,681)		(5.4)	%
Other items, net	(15)		0.0	%	(48)		(0.2)	%
Actual tax expense	$	6,875	8.1	%	$	5,156	16.5	%

Income tax expense was $6.9 million for the year ended December 31, 2021 compared to $5.2 million for the year ended December 31, 2020. The increase was primarily related to increased pre-tax income offset by a lower effective tax rate. The effective tax rates for the years ended December 31, 2021 and 2020 were 8.1% and 16.5%, respectively. The decrease in the effective rate from 2020 to 2021 was primarily related to excess tax benefit from stock-based compensation and tax-exempt income earned on certain municipal bonds.

The tax effects of temporary differences that give rise to significant portions of the deferred tax assets and liabilities included in other assets are as follows:


	December 31,
	2021		2020

	(Dollars in thousands)
Deferred tax assets
Allowance for loan losses	$	2,027	$	1,941

Securities available-for-sale	4,016		—
Accrued vacation pay	633		448
Accrued bonus	402		301

State taxes	660		423
Operating lease liabilities	1,534		948

Other	987		279
Deferred tax assets	10,259		4,340
Deferred tax liabilities
Basis difference in fixed assets	(546)		(271)
Securities available-for-sale	—		(11,301)
Derivatives	(1,147)		(6,665)
Operating lease right-of-use assets	(1,307)		(505)


Other	(766)		(1,012)
Deferred tax liabilities	(3,766)		(19,754)
Deferred tax asset (liability), net	$	6,493	$	(15,414)

The net deferred tax assets are recorded in “Other assets” in the Company’s consolidated statements of financial condition for the year ended December 31, 2021. The net deferred tax liabilities are recorded in “Accrued expenses and other liabilities” in the Company’s consolidated statements of financial condition for the year ended December 31, 2020.

At each reporting date, the Company evaluates the positive and negative evidence used to determine the likelihood of realization of all its deferred tax assets. Based on this evaluation, management has concluded that deferred tax assets are more-likely-than-not to be realized and therefore no valuation allowance is required at December 31, 2021 and 2020.

The Company has no unrecognizable tax benefits recorded at December 31, 2021 and 2020 and does not expect the total amount of unrecognized tax benefits to significantly increase or decrease in the next twelve months. Additionally, the Company had no material interest or penalties paid or accrued related to income taxes reported in the income statement for the years ended December 31, 2021 and 2020.

The Company and its subsidiary are subject to U.S. federal income taxes as well as income taxes of various other state income taxes. The 2018 through 2021 tax years remain subject to examination by federal tax authorities, and generally, 2017 through 2021 tax years remain subject to examination by various state tax authorities.

- Definition

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.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 50
-Paragraph 21
-URI http://asc.fasb.org/extlink&oid=121826272&loc=d3e32857-109319

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SAB Topic 11.C)
-URI http://asc.fasb.org/extlink&oid=122134291&loc=d3e330215-122817

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 50
-Paragraph 17
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=121826272&loc=d3e32809-109319

Reference 4: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SAB TOPIC 6.I.5.Q1)
-URI http://asc.fasb.org/extlink&oid=122134291&loc=d3e330036-122817

Reference 5: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 50
-Paragraph 14
-URI http://asc.fasb.org/extlink&oid=121826272&loc=d3e32705-109319

Reference 6: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 270
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6424409&loc=d3e44925-109338

Reference 7: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-URI http://asc.fasb.org/topic&trid=2144680

Reference 8: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 30
-Section 50
-Paragraph 2
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=6424122&loc=d3e41874-109331

Reference 9: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 235
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.4-08(h)(2))
-URI http://asc.fasb.org/extlink&oid=120395691&loc=d3e23780-122690

+ Details

Commitments and Contingencies

12 Months Ended

Dec. 31, 2021

Commitments and Contingencies Disclosure [Abstract]

Commitments and Contingencies

Off-Balance Sheet Items

In the normal course of business, the Company enters into various transactions, which, in accordance with GAAP, are not included in the consolidated statements of financial condition. The Company enters into these transactions to meet the financing needs of its customers. These transactions include commitments to extend credit and issue letters of credit, which involve, to varying degrees, elements of credit risk and interest rate risk exceeding the amounts recognized on the consolidated statements of financial condition. The Company’s exposure to credit loss is represented by the contractual amounts of these commitments. The same credit policies and procedures are used in making these commitments as for on-balance sheet instruments. The Company is not aware of any accounting loss to be incurred by funding these commitments, however, an allowance for off-balance sheet credit risk is recorded in other liabilities on the statements of financial condition. The allowance for these commitments amounted to approximately $0.6 million and $0.1 million at December 31, 2021 and 2020, respectively.

The Company’s commitments associated with outstanding letters of credit and commitments to extend credit expiring by period as of the date indicated are summarized below. Since commitments associated with letters of credit and commitments to extend credit may expire unused, the amounts shown do not necessarily reflect the actual future cash funding requirements.


	December 31,
	2021		2020

	(Dollars in thousands)
Unfunded lines of credit	$	248,092	$	49,487
Letters of credit	484		133
Total credit extension commitments	$	248,576	$	49,620

Unfunded lines of credit represent unused credit facilities to the Company’s current borrowers that represent no change in credit risk that exist in the Company’s portfolio. Lines of credit generally have variable interest rates. Letters of credit are conditional commitments issued by the Company to guarantee the performance of a customer to a third party. In the event of nonperformance by the customer in accordance with the terms of the agreement with the third party, the Company would be required to fund the commitment. The maximum potential amount of future payments the Company could be required to make is represented by the contractual amount of the commitment. If the commitment is funded, the Company would be entitled to seek recovery from the client from the underlying collateral, which can include commercial real estate, physical plant and property, inventory, receivables, bitcoin, cash and/or marketable securities. The Company’s policies generally require that letter of credit arrangements contain security and debt covenants like those contained in loan agreements and our credit risk associated with issuing letters of credit is essentially the same as the risk involved in extending loan facilities to customers.

The Company minimizes its exposure to loss under letters of credit and credit commitments by subjecting them to the same credit approval and monitoring procedures used for on-balance sheet instruments. The effect on the Company’s revenue, expenses, cash flows and liquidity of the unused portions of these letters of credit commitments cannot be precisely predicted because there is no guarantee that the lines of credit will be used.

Commitments to extend credit are agreements to lend to a customer as long as there is no violation of any condition established in the contract, for a specific purpose. Commitments generally have variable interest rates, fixed expiration dates or other termination clauses and may require payment of a fee. Since many of the commitments are expected to expire without being drawn upon, the total commitment amounts disclosed above do not necessarily represent future cash requirements. The Company evaluates each customer’s credit worthiness on a case-by-case basis. The amount of collateral obtained if deemed necessary by the Company is based on management’s credit evaluation of the customer.

Litigation

The Company is involved in various matters of litigation which have arisen in the ordinary course of its business. In the opinion of management, the disposition of such pending litigation will not have a material adverse effect on the Company’s financial statements.

Stock-based Compensation

12 Months Ended

Dec. 31, 2021

Share-based Payment Arrangement [Abstract]

Stock-based Compensation

In June 2018, the Company adopted the 2018 Equity Compensation Plan, or 2018 Plan, that permits the Compensation Committee, in its sole discretion, to grant various forms of incentive awards. Under the 2018 Plan, the Compensation Committee has the power to grant stock options, stock appreciation rights, or SARs, restricted stock and restricted stock units. The number of shares that may be issued pursuant to awards under the 2018 Plan is 1,596,753.

In accordance with authoritative guidance for stock-based compensation, compensation expense is recognized only for those shares expected to vest, based on the Company’s historical experience and future expectations. The Company has elected a policy of estimating expected forfeitures.

Total stock-based compensation expense was $1.9 million and $0.9 million for the years ended December 31, 2021 and 2020, respectively. The total income tax benefit was $13.6 million and $2.2 million, for the years ended December 31, 2021 and 2020, respectively.

Stock Options

Stock options issued under the 2018 Plan and 2010 Plan generally have terms of 10 years, with vesting based only on performing service through the vest date, which are generally graded over three to four years. Stock options are forfeited when the participant terminates service and vested options are exercisable within 60 days. Stock options are nontransferable and non-hedgeable. Stock options are issued at an exercise price not less than 100% of the fair market value of a share of the Company’s common stock on the date of grant. Stock options are expensed on a straight-line basis over the grant vesting period, which is considered to be the requisite service period.

The fair value of each option award is estimated on the date of grant using a closed form option valuation (Black-Scholes) model that uses the assumptions noted in the table below. Expected volatilities are based on historical volatilities of the Company’s common stock, historical volatilities of a peer group or a combination of both. The Company uses the simplified method to estimate expected term for stock options because the Company does not have sufficient historical exercise data to provide a reasonable basis upon which to estimate expected term. The risk-free interest rate for the expected term of the option is based on the U.S. Treasury yield curve in effect at the time of the grant.

The fair value of the option grants for the years ended December 31, 2021 and 2020 and were estimated on the date of the grant using the Black-Scholes option pricing model with the assumptions presented below:


	Year Ended December 31,
	2021			2020
Weighted-average assumptions used:
Risk-free interest rate	0.95		%	1.45		%
Expected term	6.0 years			6.2 years
Expected stock price volatility	42.44 %			30.88		%
Dividend yield	0.00		%	0.00		%

Weighted-average grant date fair value	$	52.78		$	4.93

A summary of stock option activity as of December 31, 2021 and changes during the year then ended is presented below:


	Number of Options	Weighted Average Exercise Price		Weighted Average Remaining Contractual Life (in years)	Aggregate Intrinsic Value (in thousands)
Outstanding at January 1, 2021	595,303	$	8.01
Granted	18,585	127.56
Exercised	(414,602)	5.39
Forfeited or expired	(8,095)	16.09
Outstanding at December 31, 2021	191,191	$	24.97	7.1 years	$	23,561
Exercisable at December 31, 2021	94,434	$	12.16	6.1 years	$	12,847
Vested or Expected to Vest at December 31, 2021	182,372	$	24.73	7.1 years	$	22,518

The intrinsic value for stock options is calculated based on the exercise price of the underlying awards and the book value of the Company’s common stock as of the reporting date. The intrinsic value of options exercised was approximately $43.0 million and $7.8 million for the years ended December 31, 2021 and 2020, respectively. The tax benefit from option exercises was approximately $12.5 million and $2.1 million, for the years ended December 31, 2021 and 2020, respectively.

As of December 31, 2021, there was $1.0 million of total unrecognized compensation cost related to nonvested stock options which is expected to be recognized over a weighted-average period of 2.1 years.

Restricted Stock Units

Restricted stock unit awards are valued at the market price of a share of the Company’s common stock on the date of grant. In general, these awards vest over one to four years from the date of grant and are expensed on a straight-line basis over that period, which is considered to be the requisite service period.

A summary of the status of the Company’s nonvested restricted stock unit awards as of December 31, 2021, and changes during the year then ended, is presented below:


	Number of Shares	Weighted-Average Grant Date Fair Value Per Share
Nonvested at January 1, 2021	58,690	$	15.61
Granted	31,788	121.61
Vested	(29,499)	15.17
Forfeited	(4,108)	50.91
Nonvested at December 31, 2021	56,871	$	72.53

At December 31, 2021, there was approximately $2.6 million of total unrecognized compensation expense related to nonvested restricted stock unit awards, which is expected to be recognized over a weighted-average period of 2.1 years. The total fair value of awards vested during the years ended December 31, 2021 and 2020 was $0.4 million and $0.5 million, respectively.

Employee Benefit Plan	12 Months Ended
Employee Benefit Plan	Dec. 31, 2021
Retirement Benefits [Abstract]
Employee Benefit Plan	Employee Benefit PlanThe Company has a 401(k) plan in which approximately 93% of all employees participate. Employees may contribute a percentage of their compensation subject to certain limits based on Federal tax laws. During the years ended December 31, 2021 and 2020, the Company made an elective matching contribution up to 50% of deferrals to a maximum of the first 5% of the employee’s compensation contributed to the plan. Additionally, the Company had the option to make an elective annual discretionary contribution as determined annually by management. For the years ended December 31, 2021 and 2020, total expense attributed to the plan amounted to approximately $0.6 million and $0.5 million, respectively.

Regulatory Capital

12 Months Ended

Dec. 31, 2021

Regulated Operations [Abstract]

Regulatory Capital

Banks and bank holding companies are subject to regulatory capital requirements administered by federal banking agencies. Capital adequacy guidelines and, additionally for banks, prompt corrective action regulations, involve quantitative measures of assets, liabilities, and certain off-balance-sheet items calculated under regulatory accounting practices. Capital amounts and classifications are also subject to qualitative judgments by regulators. Failure to meet capital requirements can initiate regulatory action. The final rules implementing Basel Committee on Banking Supervision’s capital guidelines for U.S. banks (Basel III rules) became effective for the Company on January 1, 2015 with full compliance with all of the requirements being phased in over a multi-year schedule, and fully phased in by January 1, 2019. Under the Basel III rules, the Company must hold a capital conservation buffer above the adequately capitalized risk-based capital ratios. As of January 1, 2019, the capital conservation buffer had fully phased in to 2.50%. Inclusive of the fully phased-in capital conservation buffer, the common equity tier 1 capital ratio, tier 1 risk-based capital ratio and total risk-based capital ratio minimums are 7.00%, 8.50% and 10.50%, respectively. The net unrealized gain or loss on available for sale securities and derivatives are not included in computing regulatory capital. Management believes as of December 31, 2021, the Company and the Bank met all capital adequacy requirements to which they were subject.

Prompt corrective action regulations provide five classifications: well capitalized, adequately capitalized, undercapitalized, significantly undercapitalized, and critically undercapitalized, although these terms are not used to represent overall financial condition. If adequately capitalized, regulatory approval is required to accept brokered deposits. If undercapitalized, capital distributions are limited, as is asset growth and expansion, and capital restoration plans are required. For the periods presented, the most recent regulatory notifications categorized the Bank as well capitalized under the regulatory framework for prompt corrective action. There are no conditions or events since that notification that management believes have changed the institution’s category.

Actual capital amounts and ratios for the Company and the Bank as of December 31, 2021 and 2020, are presented in the following tables:


	Actual				Minimum capital adequacy(1)				To be well capitalized
	Amount		Ratio		Amount		Ratio		Amount		Ratio

	(Dollars in thousands)
December 31, 2021
The Company
Tier 1 leverage ratio	$	1,631,257	11.07	%	$	589,614	4.00	%	N/A		N/A
Common equity tier 1 capital ratio	1,422,136		49.53	%	129,198		4.50	%	N/A		N/A
Tier 1 risk-based capital ratio	1,631,257		56.82	%	172,264		6.00	%	N/A		N/A
Total risk-based capital ratio	1,638,794		57.08	%	229,686		8.00	%	N/A		N/A
The Bank
Tier 1 leverage ratio	1,546,693		10.49	%	589,595		4.00	%	$	736,994	5.00	%
Common equity tier 1 capital ratio	1,546,693		53.89	%	129,162		4.50	%	186,567		6.50	%
Tier 1 risk-based capital ratio	1,546,693		53.89	%	172,216		6.00	%	229,622		8.00	%
Total risk-based capital ratio	1,554,230		54.15	%	229,622		8.00	%	287,027		10.00	%


	Actual				Minimum capital adequacy(1)				To be well capitalized
	Amount		Ratio		Amount		Ratio		Amount		Ratio

	(Dollars in thousands)
December 31, 2020
The Company
Tier 1 leverage ratio	$	263,763	8.29	%	$	127,338	4.00	%	N/A		N/A
Common equity tier 1 capital ratio	248,263		21.53	%	51,882		4.50	%	N/A		N/A
Tier 1 risk-based capital ratio	263,763		22.88	%	69,176		6.00	%	N/A		N/A
Total risk-based capital ratio	270,803		23.49	%	92,234		8.00	%	N/A		N/A
The Bank
Tier 1 leverage ratio	261,791		8.22	%	127,344		4.00	%	$	159,180	5.00	%
Common equity tier 1 capital ratio	261,791		22.71	%	51,869		4.50	%	74,923		6.50	%
Tier 1 risk-based capital ratio	261,791		22.71	%	69,159		6.00	%	92,212		8.00	%
Total risk-based capital ratio	268,831		23.32	%	92,212		8.00	%	115,265		10.00	%

________________________

(1)Minimum capital adequacy for common equity tier 1 capital ratio, tier 1 risk-based capital ratio and total risk-based capital ratio excludes the capital conservation buffer.

The Bank is restricted as to the amount of dividends that it can pay to the Company. Dividends declared in excess of the lesser of the Bank’s undivided profits or the Bank’s net income for its last three fiscal years less the amount of any distribution made to the Bank’s shareholders during the same period must be approved by the California DFPI. Also, the Bank may not pay dividends that would result in capital levels being reduced below the minimum requirements shown above.

- Definition

The entire disclosure for regulatory capital requirement for depository and lending institutions. Institutions include, but not are not limited to, finance company, insured depository institution, bank holding company, savings and loan association holding company, bank and savings institution not federally insured, mortgage company, foreign financial institution and credit union.

+ References + Details

Fair Value

12 Months Ended

Dec. 31, 2021

Fair Value Disclosures [Abstract]

Fair Value

Fair value is defined as the exchange price that would be received for an asset or paid to transfer a liability (an exit price) in the principal or most advantageous market for the asset or liability in an orderly transaction between market participants on the measurement date. This standard’s fair value hierarchy requires an entity to maximize the use of observable inputs and minimize the use of unobservable inputs when measuring fair value. The standard describes three levels of inputs that may be used to measure fair value:

Level 1—Quoted prices (unadjusted) for identical assets or liabilities in active markets that the entity has the ability to access as of the measurement date.

Level 2—Significant observable inputs other than Level 1 prices, such as quoted prices for similar assets or liabilities; quoted prices in markets that are not active; or other inputs that are observable or can be corroborated by observable market data.

Level 3—Significant unobservable inputs that reflect a Company’s own assumptions about the assumptions that market participants would use in pricing an asset or liability.

Financial Instruments Required To Be Carried At Fair Value

The following is a description of valuation methodologies used for assets and liabilities recorded at fair value:

Securities. The fair values of securities available-for-sale and trading securities are determined by obtaining quoted prices on nationally recognized securities exchanges (Level 1). For securities where quoted prices are not available, fair values are calculated based on market prices of similar securities (Level 2), using matrix pricing. Matrix pricing is a mathematical technique commonly used to price debt securities that are not actively traded, which values debt securities without relying exclusively on quoted prices for specific securities but rather by relying on the securities’ relationship to other benchmark quoted securities (Level 2 inputs).

Derivatives. The Company’s derivative assets and liabilities are carried at fair value as required by GAAP. The estimated fair values of the derivative assets and liabilities are based on current market prices for similar instruments. Given the meaningful level of secondary market activity for derivative contracts, active pricing is available for similar assets and accordingly, the Company classifies its derivative assets and liabilities as Level 2.

Impaired loans (collateral-dependent). The Company does not record impaired loans at fair value on a recurring basis. However, from time to time, fair value adjustments are recorded on these loans to reflect (1) partial write-downs, through charge-offs or specific allowances, that are based on the current appraised or market-quoted value of the underlying collateral or (2) the full charge-off of the loan carrying value. In some cases, the properties for which market quotes or appraised values have been obtained are located in areas where comparable sales data is limited, outdated, or unavailable. Fair value estimates for collateral-dependent impaired loans are obtained from real estate brokers or other third-party consultants. These appraisals may utilize a single valuation approach or a combination of approaches, which generally include various Level 3 inputs. Adjustments are routinely made in the appraisal process by the appraisers to adjust for differences between the comparable sales and income data available and such adjustments are typically significant. Appraisals may be adjusted by management for qualitative factors such as economic factors and estimated liquidation expenses. The range of these possible adjustments may vary. Impaired loans presented in the table below as of the periods presented, include impaired loans with specific allowances as well as impaired loans that have been partially charged-off.

The following tables provide the hierarchy and fair value for each class of assets and liabilities measured at fair value for the periods presented.

As of December 31, 2021 and 2020, assets and liabilities measured at fair value on a recurring basis are as follows:


	Fair Value Measurements Using
	Quoted Prices in Active Markets for Identical Assets		Significant Other Observable Inputs		Significant Unobservable Inputs
	Level 1		Level 2		Level 3		Total

	(Dollars in thousands)
December 31, 2021
Assets

Securities available-for-sale	$	—	$	8,625,259	$	—	$	8,625,259
Derivative assets	—		34,056		—		34,056
	$	—	$	8,659,315	$	—	$	8,659,315


	Fair Value Measurements Using
	Quoted Prices in Active Markets for Identical Assets		Significant Other Observable Inputs		Significant Unobservable Inputs
	Level 1		Level 2		Level 3		Total

	(Dollars in thousands)
December 31, 2020
Assets

Securities available-for-sale	$	—	$	939,015	$	—	$	939,015
Derivative assets	—		31,104		—		31,104
	$	—	$	970,119	$	—	$	970,119

There were no assets measured at fair value on a nonrecurring basis as of December 31, 2021. As of December 31, 2020 assets measured at fair value on a non-recurring basis are summarized as follows:

Fair Value Measurements Using

Quoted Prices
in Active
Markets for
Identical Assets

Significant Other
Observable
Inputs

Significant
Unobservable
Inputs

Level 1

Level 2

Level 3

Total

(Dollars in thousands)

December 31, 2020

Assets

Impaired loans:

Reverse mortgage

$

—

$

—

$

317

$

317

Quantitative Information about Level 3 Fair Value Measurements

The following table presents the valuation methodology and unobservable inputs for Level 3 assets measured at fair value on a nonrecurring basis as of the date indicated:

Fair Value

Valuation Technique(s)

Significant
Unobservable
Inputs

Range

Weighted Average(1)

(Dollars in thousands)

December 31, 2020

Collateral-dependent impaired loans

$

317

Market comparable properties

Marketability discount

10.0

%

10.0

%

________________________

(1)Unobservable inputs were weighted by the relative fair value of the instruments.

Financial Instruments Not Required To Be Carried At Fair Value

FASB ASC Topic 825, Financial Instruments, requires the disclosure of the estimated fair value of financial instruments. The Company’s estimated fair value amounts have been determined by the Company using available market information and appropriate valuation methodologies. However, considerable judgment is required to develop the estimates of fair value. Accordingly, the estimates are not necessarily indicative of the amounts the Company could have realized in a current market exchange. The use of different market assumptions and/or estimation methodologies may have a material effect on the estimated fair value amounts.

The following tables present information about the Company’s assets and liabilities that are not measured at fair value in the consolidated statements of financial condition as of the dates presented:


	Carrying Amount		Fair Value Measurements Using
			Level 1		Level 2		Level 3		Total

	(Dollars in thousands)
December 31, 2021
Financial assets:
Cash and due from banks	$	208,193	$	208,193	$	—	$	—	$	208,193
Interest earning deposits	5,179,753		5,179,753		—		—		5,179,753

Loans held-for-sale	893,194		—		893,194		—		893,194
Loans held-for-investment, net	887,304		—		—		891,166		891,166
Accrued interest receivable	40,370		41		8,980		31,349		40,370
Financial liabilities:
Deposits	$	14,290,628	$	—	$	14,167,200	$	—	$	14,167,200




Subordinated debentures, net	15,845		—		15,646		—		15,646
Accrued interest payable	223		—		223		—		223


	Carrying Amount		Fair Value Measurements Using
			Level 1		Level 2		Level 3		Total

	(Dollars in thousands)
December 31, 2020
Financial assets:
Cash and due from banks	$	16,405	$	16,405	$	—	$	—	$	16,405
Interest earning deposits	2,945,682		2,945,682		—		—		2,945,682

Loans held-for-sale	865,961		—		865,961		—		865,961
Loans held-for-investment, net	746,751		—		—		751,165		751,165
Accrued interest receivable	8,698		8		2,630		6,060		8,698
Financial liabilities:
Deposits	$	5,248,026	$	—	$	5,458,900	$	—	$	5,458,900




Subordinated debentures, net	15,831		—		15,231		—		15,231
Accrued interest payable	260		—		260		—		260

- Definition

The entire disclosure for the fair value of financial instruments (as defined), including financial assets and financial liabilities (collectively, as defined), and the measurements of those instruments as well as disclosures related to the fair value of non-financial assets and liabilities. Such disclosures about the financial instruments, assets, and liabilities would include: (1) the fair value of the required items together with their carrying amounts (as appropriate); (2) for items for which it is not practicable to estimate fair value, disclosure would include: (a) information pertinent to estimating fair value (including, carrying amount, effective interest rate, and maturity, and (b) the reasons why it is not practicable to estimate fair value; (3) significant concentrations of credit risk including: (a) information about the activity, region, or economic characteristics identifying a concentration, (b) the maximum amount of loss the entity is exposed to based on the gross fair value of the related item, (c) policy for requiring collateral or other security and information as to accessing such collateral or security, and (d) the nature and brief description of such collateral or security; (4) quantitative information about market risks and how such risks are managed; (5) for items measured on both a recurring and nonrecurring basis information regarding the inputs used to develop the fair value measurement; and (6) for items presented in the financial statement for which fair value measurement is elected: (a) information necessary to understand the reasons for the election, (b) discussion of the effect of fair value changes on earnings, (c) a description of [similar groups] items for which the election is made and the relation thereof to the balance sheet, the aggregate carrying value of items included in the balance sheet that are not eligible for the election; (7) all other required (as defined) and desired information.

+ References + Details

Earnings Per Share

12 Months Ended

Dec. 31, 2021

Earnings Per Share [Abstract]

Earnings Per Share

The computation of basic and diluted earnings per share is shown below.


	Year Ended December 31,
	2021		2020

	(Dollars in thousands, except per share data)
Basic
Net income	$	78,528	$	26,038
Less: Dividends paid to preferred shareholders	3,016		—
Net income available to common shareholders	$	75,512	$	26,038
Weighted average common shares outstanding	25,582		18,691
Basic earnings per common share	$	2.95	$	1.39
Diluted
Net income available to common shareholders	$	75,512	$	26,038
Weighted average common shares outstanding for basic earnings per common share	25,582		18,691
Add: Dilutive effects of stock-based awards	340		486
Average shares and dilutive potential common shares	25,922		19,177
Dilutive earnings per common share	$	2.91	$	1.36

Stock-based awards for 33,000 and 160,000 shares of common stock were not considered in computing diluted earnings per share for the years ended December 31, 2021 and 2020, respectively, because they were anti-dilutive.

Shareholders' Equity

12 Months Ended

Dec. 31, 2021

Equity [Abstract]

Shareholders' Equity

Shareholders’ Equity

The Company’s Articles of Incorporation, as amended, or Articles authorize the Company to issue up to (i) 125,000,000 shares of Class A Common Stock, par value $0.01 per share (“Class A Common Stock”), (ii) 25,000,000 shares of Class B Non-Voting Common Stock, par value $0.01 per share (“Class B Non-Voting Common Stock”), and (iii) 10,000,000 shares of Preferred Stock, par value $0.01 per share.

Preferred Stock

The Company, upon authorization of the board of directors, may issue shares of one or more series of preferred stock from time to time. The board of directors may, without any action by holders of Class A and Class B Common Stock or, except as may be otherwise provided in the terms of any series of preferred stock of which there are shares outstanding, holders of preferred stock adopt resolutions to designate and establish a new series of preferred stock. Upon establishing such a series of preferred stock, the board will determine the number of shares of preferred stock of that series that may be issued and the rights and preferences of that series of preferred stock. The rights of any series of preferred stock may include, among others, general or special voting rights; preferential liquidation or preemptive rights; preferential cumulative or noncumulative dividend rights; redemption or put rights; and conversion or exchange rights.

On August 4, 2021, the Company issued and sold 8,000,000 depositary shares (the “Depositary Shares”), each representing a 1/40th interest in a share of 5.375% Fixed Rate Non-Cumulative Perpetual Preferred Stock, Series A, par value $0.01 per share (the “Series A Preferred Stock”), with a liquidation preference of $1,000 per share of Series A Preferred Stock, equivalent to $25 per Depositary Share. The aggregate gross proceeds of the offering were $200.0 million and net proceeds to the Company were approximately $193.7 million after deducting underwriting discounts and offering expenses. When, as and if declared by the board of directors of the Company, or a duly authorized board committee, dividends will be payable from the date of issuance, quarterly in arrears, beginning on November 15, 2021. The Company may redeem the Series A Preferred Stock at its option, subject to regulatory approval, on or after August 15, 2026.

Preferred Stock Dividend

On October 14, 2021, the Company’s Board of Directors declared the first quarterly dividend payment of $15.08 per share, equivalent to $0.377 per depositary share, on its Fixed Rate Non-Cumulative Perpetual Preferred Stock, Series A, for the period covering August 4, 2021 through November 14, 2021 for a total dividend of $3.0 million. The depositary shares representing the Series A Preferred Stock are traded on the New York Stock Exchange under the symbol “SI PRA.” The dividend was paid on November 15, 2021 to shareholders of record of the preferred stock as of October 29, 2021.

Common Stock

Class A Voting Common Stock. Each holder of Class A Common Stock is entitled to one vote for each share on all matters submitted to a vote of shareholders, except as otherwise required by law and subject to the rights and preferences of the holders of any outstanding shares of our preferred stock. The members of the Company’s board of directors are elected by a plurality of the votes cast. The Company’s Articles expressly prohibit cumulative voting.

Class B Non-Voting Common Stock. Class B Non-Voting Common Stock is non-voting while held by the initial holder with certain limited exceptions. Each share of Class B Non-Voting Common Stock will automatically convert into a share of Class A Common Stock upon certain sales or transfers by the initial holder of such shares including to an unaffiliated third-party and in a widely dispersed public offering. If Class B Non-Voting Common Stock is sold or transferred to an affiliate of the initial holder, the Class B Non-Voting Common Stock would not convert into Class A Common Stock.

On January 26, 2021, the Company completed its underwritten public offering of 4,563,493 shares of Class A common stock at a price of $63.00 per share, including 595,238 shares of Class A common stock upon the exercise in full by the underwriters of their option to purchase additional shares. The aggregate gross proceeds of the offering were $287.5 million and net proceeds to the Company were $272.4 million after deducting underwriting discounts and offering expenses.

On March 9, 2021, the Company entered into an equity distribution agreement pursuant to which the Company could issue and sell, from time to time, up to an aggregate gross sales price of $300.0 million of the Company’s shares of Class A common stock through an “at-the-market” equity offering program, or ATM Offering. As of June 30, 2021, the Company had completed the ATM Offering with a total of 2,793,826 shares of Class A common stock sold at an average price of $107.38. The transactions resulted in net proceeds to the Company of $295.1 million after deducting commissions and expenses.

On December 9, 2021, the Company completed its underwritten public offering of 3,806,895 shares of Class A common stock at a price of $145.00 per share, including 496,551 shares of Class A common stock upon the exercise in full by the underwriters of their option to purchase additional shares. The aggregate gross proceeds of the offering were $552.0 million and net proceeds to the Company were $530.3 million after deducting underwriting discounts and offering expenses.

Accumulated Other Comprehensive Income

The Company presents comprehensive income in accordance with FASB ASC Topic 220, Comprehensive Income, that requires the disclosure of comprehensive income or loss and its components. Other comprehensive income (loss) includes unrealized gains and losses on securities available-for-sale and the change in the fair value of cash flow hedges, net of deferred tax effects, which are also recognized as a separate component of equity.

The following table shows for the years ended December 31, 2021 and 2020, changes in the balances of each component of accumulated other comprehensive income, net of tax:


	Unrealized Gains/ (Losses) on Available-for- Sale Securities		Derivative Asset/(Liability)		Accumulated Other Comprehensive Income/(Loss)

	(Dollars in thousands)
Beginning balance, January 1, 2020	$	4,071	$	2,330	$	6,401
Current period other comprehensive income before reclassification	27,566		15,932		43,498
Amounts reclassified from accumulated other comprehensive income	(2,679)		(1,184)		(3,863)
Ending balance, December 31, 2020	28,958		17,078		46,036
Current period other comprehensive income before reclassification	(34,896)		(12,847)		(47,743)
Amounts reclassified from accumulated other comprehensive income	(3,750)		(1,465)		(5,215)
Ending balance, December 31, 2021	$	(9,688)	$	2,766	$	(6,922)

- Definition

The entire disclosure for shareholders' equity comprised of portions attributable to the parent entity and noncontrolling interest, including other comprehensive income. Includes, but is not limited to, balances of common stock, preferred stock, additional paid-in capital, other capital and retained earnings, accumulated balance for each classification of other comprehensive income and amount of comprehensive income.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section 50
-Paragraph 13
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=123467817&loc=SL123496158-112644

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
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-URI http://asc.fasb.org/extlink&oid=123467817&loc=SL123496158-112644

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
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-URI http://asc.fasb.org/extlink&oid=123467817&loc=SL123496171-112644

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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-Name Accounting Standards Codification
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-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.3-04)
-URI http://asc.fasb.org/extlink&oid=120397183&loc=d3e187085-122770

Reference 6: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section 50
-Paragraph 18
-Subparagraph (d)
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Reference 7: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
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Reference 8: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
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Reference 9: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
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Reference 10: http://www.xbrl.org/2003/role/disclosureRef
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-Name Accounting Standards Codification
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-Publisher FASB
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-Name Accounting Standards Codification
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+ Details

Parent Company Financial Information

12 Months Ended

Dec. 31, 2021

Condensed Financial Information Disclosure [Abstract]

Parent Company Financial Information

Condensed financial information for the Corporation (parent company only) is as follows:

Statements of Financial Condition


	December 31,
	2021		2020

	(Dollars in thousands)
ASSETS
Cash and due from banks	$	84,736	$	1,991


Investments in subsidiaries	1,540,392		308,740
Other assets	245		236
Total assets	$	1,625,373	$	310,967
LIABILITIES AND SHAREHOLDERS’ EQUITY

Subordinated debentures, net	$	15,845	$	15,831
Accrued expenses and other liabilities	692		837
Total liabilities	16,537		16,668
Commitments and contingencies
Preferred stock	2		—
Class A common stock	304		188
Class B non-voting common stock	—		1
Additional paid-in capital	1,421,592		129,726
Retained earnings	193,860		118,348
Accumulated other comprehensive (loss) income	(6,922)		46,036
Total shareholders’ equity	1,608,836		294,299
Total liabilities and shareholders’ equity	$	1,625,373	$	310,967

Statements of Operations


	Year Ended December 31,
	2021		2020

	(Dollars in thousands)



Total interest income	$	17	$	22
Interest expense

Subordinated debentures and other	993		1,083
Total interest expense	993		1,083
Net interest expense	(976)		(1,061)
Noninterest expense
Salaries and employee benefits	1,219		1,071
Occupancy and equipment	102		102
Communications and data processing	174		176
Professional services	1,905		1,104
Correspondent bank charges	—		1
Other general and administrative	429		280
Total noninterest expense	3,829		2,734
Loss before income taxes and equity in undistributed earnings of subsidiaries	(4,805)		(3,795)
Income tax benefit	(1,362)		(1,032)
Equity in undistributed earnings of subsidiaries	81,971		28,801
Net income	78,528		26,038
Dividends on preferred stock	(3,016)		—
Net income available to common shareholders	$	75,512	$	26,038

Statements of Cash Flows


	Year Ended December 31,
	2021		2020

	(Dollars in thousands)
Cash flows from operating activities
Net income	$	78,528	$	26,038
Adjustments to reconcile net income to net cash used in operating activities:
Equity in undistributed earnings of subsidiaries	(81,971)		(28,801)
Other, net	333		323
Changes in operating assets and liabilities:
Other assets	(35)		187
Accrued expenses and other liabilities	(145)		(424)
Net cash used in operating activities	(3,290)		(2,677)
Cash flows from investing activities
Investments in subsidiaries	(1,201,000)		(7,500)
Net cash used in investing activities	(1,201,000)		(7,500)
Cash flows from financing activities


Payments made on notes payable	—		(3,714)
Proceeds from common stock issuance, net	1,097,815		—

Proceeds from preferred stock issuance, net	193,621		—

Payments of preferred stock dividends	(3,016)		—
Proceeds from stock option exercise	1,923		41
Taxes paid related to net share settlement of equity awards	(3,308)		(3,335)
Other, net	—		90
Net cash provided by (used in) financing activities	1,287,035		(6,918)
Net increase (decrease) in cash and cash equivalents	82,745		(17,095)
Cash and cash equivalents, beginning of year	1,991		19,086
Cash and cash equivalents, end of year	$	84,736	$	1,991

Subsequent Events	12 Months Ended
Subsequent Events	Dec. 31, 2021
Subsequent Events [Abstract]
Subsequent Events	Subsequent Events Preferred Stock Dividend On January 14, 2022, the Company’s Board of Directors declared a quarterly dividend payment of $13.44 per share, equivalent to $0.336 per depositary share, on its Fixed Rate Non-Cumulative Perpetual Preferred Stock, Series A, for the period covering November 15, 2021 through February 14, 2022 for a total dividend of $2.7 million. The depositary shares representing the Series A Preferred Stock are traded on the New York Stock Exchange under the symbol “SI PRA.” The dividend was paid on February 15, 2022 to shareholders of record of the preferred stock as of January 31, 2022. Asset Purchase and Issuance of Common Stock On January 31, 2022 the Company entered into an Asset Purchase Agreement (the “Purchase Agreement”) under which it acquired from the Libra Association, Diem Networks US HoldCo, Inc., Diem Networks US, Inc., Diem Networks II LLC, Diem LLC, and Diem Networks LLC, (collectively, the “Sellers”) certain intellectual property and other technology assets related to running a blockchain-based payment network. The assets acquired by the Company included development, deployment and operations infrastructure and tools for running a blockchain-based payment network designed to facilitate payments for commerce and cross-border remittances as well as proprietary software elements that are critical to running a regulatory-compliant stablecoin network. The acquired assets included certain Diem trade names, but the Company has no intention of using such trade names going forward. Prior to the transaction, the Sellers were in a pre-launch phase of development. The Company did not retain any of the Sellers’ employees. Under the terms of the Purchase Agreement, the aggregate purchase price for the acquired assets was $201.2 million, consisting of (i) $50.0 million in cash consideration and (ii) $151.2 million payable in shares of the Company’s Class A common stock (the “Stock Consideration Value”), issued and delivered to the Sellers. The total amount of the Company’s Class A common stock issued to the Sellers was 1,221,217 shares, which was determined by dividing the Stock Consideration Value by the volume weighted average price per share of the Company’s Class A common stock (as determined by Bloomberg) for the twenty trading days ending on and including the fifth trading day prior to January 31, 2022. Based on the closing price of the Company’s Class A common stock on January 31, 2022, the value of the total transaction consideration was $181.6 million. The Company accounted for the purchase as an asset acquisition and capitalized direct transaction costs related to the purchase of approximately $6.6 million. Further development costs incurred will be capitalized in accordance with accounting guidance and the assets will be amortized over its expected useful life once it is ready for its intended use.

Nature of Business and Summary of Significant Accounting Policies (Policies)	12 Months Ended
	Dec. 31, 2021
Accounting Policies [Abstract]
Consolidation	Basis of Presentation The consolidated financial statements include the accounts of the Company and all other entities in which it has a controlling financial interest. All significant intercompany accounts and transactions have been eliminated in consolidation. Unless the context requires otherwise, all references to the Company include its wholly owned subsidiaries. The accounting and reporting policies of the Company conform with Generally Accepted Accounting Principles (“GAAP”) and conform to predominant practices within the financial services industry. Significant accounting policies followed by the Company are presented below.
Basis of Presentation	Basis of Presentation The consolidated financial statements include the accounts of the Company and all other entities in which it has a controlling financial interest. All significant intercompany accounts and transactions have been eliminated in consolidation. Unless the context requires otherwise, all references to the Company include its wholly owned subsidiaries. The accounting and reporting policies of the Company conform with Generally Accepted Accounting Principles (“GAAP”) and conform to predominant practices within the financial services industry. Significant accounting policies followed by the Company are presented below.
Reclassifications	Reclassifications Certain immaterial reclassifications have been made to the consolidated financial statements to conform to the current year’s presentation.
Use of Estimates	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 the disclosure of contingent assets and liabilities at the date of the financial statements and the accompanying notes, as well as the reported amounts of revenue and expense during the reporting period. Management bases estimates on historical experience and on various other assumptions that are believed to be reasonable under current circumstances, results of which form the basis for making judgments about the carrying value of certain assets and liabilities that are not readily available from other sources. Management evaluates estimates on an ongoing basis including the economic impact of Coronavirus Disease 2019 (or “COVID-19”). Actual results could materially differ from those estimates under different assumptions or conditions. The following accounting policies, together with those disclosed elsewhere in the consolidated financial statements, represent the significant accounting policies of the Company.
Cash and Cash Equivalents	Cash and Cash Equivalents Cash and cash equivalents include cash and due from banks and interest earning deposits in other banks, including federal funds sold. The Company maintains amounts due from Banks which exceed federally insured limits. The Company has not experienced any losses in such accounts. Net cash flows are reported for customer loan and deposit transactions. Interest earning deposits in other banks include funds held in other financial institutions that are either fixed or variable rate instruments, including certificates of deposits.
Securities	Securities Management determines the appropriate classification of debt securities at the time of purchase. The fair values of securities available-for-sale and trading securities are determined by obtaining quoted prices on nationally recognized securities exchanges (Level 1) or matrix pricing, which is a mathematical technique used widely in the industry to value debt securities without relying exclusively on quoted prices for specific securities but rather by relying on the securities’ relationship to other benchmark quoted securities (Level 2). Securities to be held for indefinite periods of time, but not necessarily to be held-to-maturity or on a long-term basis, are classified as available-for-sale and carried at fair value, with unrealized gains or losses, net of applicable deferred income taxes, reported as a separate component of shareholders’ equity in accumulated other comprehensive income. Interest income is recognized under the interest method and includes amortization of purchase premiums and accretion of purchase discounts. Premiums and discounts on securities are amortized or accreted based on a level yield methodology, without anticipating prepayments, except for mortgage-backed securities where prepayments are anticipated. Realized gains or losses on the sale of securities are determined using the specific identification method and are recorded on settlement date. Securities classified as available-for-sale include securities that management intends to use as part of its asset / liability management strategy and may be sold to provide liquidity in response to changes in interest rates, prepayment risk, or other related factors. Securities classified as held-to-maturity are carried at amortized cost when management has the positive intent to hold the securities to maturity. Management evaluates securities for other than temporary impairment (OTTI) on a monthly basis. Management considers, among other things, (i) the length of time and the extent to which the fair value has been less than cost, (ii) the financial condition and near-term prospects of the issuer, and (iii) the Company’s intent and ability to retain the investment for a period of time sufficient to allow for any anticipated recovery in fair value. Evidence evaluated includes, but is not limited to, the remaining payment terms of the instrument and economic factors that are relevant to the collectability of the instrument, such as: current prepayment speeds, the current financial condition of the issuer(s), industry analyst reports, credit ratings, credit default rates, interest rate trends, the quality of any credit enhancement and the value of any underlying collateral. For each security in an unrealized loss position, the Company assesses whether it intends to sell the security or if it is more likely than not that the Company will be required to sell the security before recovery of its amortized cost basis less any current-period credit losses. If the Company intends to sell the security or it is more likely than not the Company will be required to sell the security before recovery of its amortized cost basis less any current-period credit loss, the entire difference between the investment’s amortized cost basis and its fair value at the balance sheet date is recognized in earnings. For impaired securities that are not intended for sale and will not be required to be sold prior to recovery of the Company’s amortized cost basis, the Company determines if the impairment has a credit loss component. For both held-to-maturity and available-for-sale securities, if there is no credit loss, no further action is required. For both held-to-maturity and available-for-sale securities, if the amount or timing of cash flows expected to be collected are less than those at the last reporting date, an other-than-temporary impairment shall be considered to have occurred and the credit loss component is recognized in earnings as the present value of the change in expected future cash flows. In determining the present value of the expected cash flows the Company discounts the expected cash flows at the effective interest rate implicit in the security at the date of purchase. The remaining difference between the security’s fair value and the amortized basis is deemed to be due to factors that are not credit related and is recognized in other comprehensive income, net of applicable taxes.
Loans	Loans Held-for-investment Loans that management has the intent and ability to hold for the foreseeable future or until maturity or payoff are reported at the principal balance outstanding, net of deferred loan fees, unamortized premiums and discounts and an allowance for loan loss. Interest on loans is accrued using the effective interest method based on principal amounts outstanding. Nonrefundable loan fees and certain direct costs associated with the origination of loans are deferred and recognized as an adjustment to interest income over the contractual life of the loans using the level yield method, without anticipating prepayments, or straight-lined for loans with revolving features such as construction loans or lines of credit. The accretion of loan fees and costs is discontinued on nonaccrual loans. In addition to originating loans, the Company may, from time to time, purchases individual loans and groups of loans. For those purchased loans that management intends to hold for the foreseeable future or until maturity, the purchase premiums and discounts are amortized or accreted using the effective interest method over the remaining contractual life of the loan or straight-lined to their estimated termination for loans with revolving features such as reverse mortgages. Nonaccrual Loans Loans are placed on nonaccrual status when, in the opinion of management, the full and timely collection of principal or interest is in doubt. Generally, the accrual of interest is discontinued when principal or interest payments become 90 or more days past due. In all cases, loans are placed on nonaccrual or charged-off at an earlier date if collection of the principal or interest is considered doubtful. When a loan is placed on nonaccrual status, previously accrued but unpaid interest is reversed against current income. Subsequent collections of unpaid amounts on such a loan are applied to reduce principal when received, except when the ultimate collectability of principal is probable, in which case interest payments are credited to income. Nonaccrual loans may be restored to accrual status if and when principal and interest become current and full repayment is expected, which is typically after six months of continuous on time payments. Allowance for Loan Losses The allowance for loan losses is a valuation allowance for probable incurred credit losses. Management groups loans into different categories based on loan type to determine the appropriate allowance for each loan group. Management estimates the allowance balance required using past loan loss experience, current economic conditions, the nature and volume of the portfolio, information about specific borrower situations, estimated collateral values and other factors. Allocations of the allowance may be made for specific loans, but the entire allowance is available for any loan that, in management’s judgment, should be charged off. Amounts are charged off when available information confirms that specific loans, or portions thereof, are uncollectible. This methodology for determining charge-offs is consistently applied to each group of loans. Loans that are deemed to be uncollectible are charged off and deducted from the allowance for loan losses. The provision for loan losses and recoveries on loans previously charged off are credited to the allowance for loan losses. The allowance consists of specific and general components. The specific component relates to loans that are individually classified as impaired when, based on current information and events, it is probable that the Company will be unable to collect all amounts due according to the contractual terms of the loan agreement. Loans for which the terms have been modified resulting in a concession, and for which the borrower is experiencing financial difficulties, are considered troubled debt restructurings (TDRs) and classified as impaired. A loan is considered impaired when full payment under the loan terms is not expected. Impairment is evaluated on an individual loan basis for all loans that meet the criteria for specifically evaluated impairment. If a loan is impaired, a portion of the allowance is allocated so that the loan is reported, net of the present value of estimated future cash flows using the loan’s original effective rate or at the fair value of collateral less estimated costs to sell if repayment is expected solely from the collateral. Factors considered in determining impairment include payment status, collateral value and the probability of collecting all amounts when due. Large groups of smaller-balance homogeneous loans such as residential real estate loans are collectively evaluated for impairment and, accordingly, they are not separately identified for impairment disclosures. Loans that experience insignificant payment delays and payment shortfalls are generally not classified as impaired. Management considered the significance of payment delays on a case by case basis, taking into consideration all the circumstances of the loan and borrower, including the length of delay, the reasons for the delay, the borrower’s prior payment record, and the amount of the shortfall in relation to principal and interest owed. The general component covers loans that are collectively evaluated for impairment and loans that are not individually identified for impairment evaluation. The general component is based on historical loss experience adjusted for current factors and includes actual loss history experienced for the preceding rolling twelve-year period or less, if twelve years of data is not available. This actual loss experience is supplemented with other economic factors based on the risks present for each portfolio segment using a qualitative scorecard model. Qualitative adjustments to historic loss rates are made for each portfolio segment based on the following factors: changes in lending policies and procedures, including changes in underwriting standards and collection, charge-off, and recovery practices not considered elsewhere in estimating credit losses; changes in international, national, regional, and local economic and business conditions and developments that affect the collectability of the portfolio, including the condition of various market segments; changes in the nature and volume of the portfolio and in the terms of loans; changes in the experience, ability, and depth of lending management and other relevant staff; changes in the volume and severity of past due loans, the volume of non-accrual loans, and the volume and severity of adversely classified or graded loans; changes in the quality of the institution’s loan review system; changes in the value of underlying collateral for collateral-dependent loans; the existence and effect of any concentrations of credit, and changes in the level of such concentrations; and the effect of other external factors such as competition and legal and regulatory requirements on the level of estimated credit losses in the institution’s existing portfolio. The range of qualitative adjustments applied to each portfolio segment is based on management’s evaluation of risk factors applied to historic loan and net-charge-off experience for peer data as reported in the call report for each specific loan portfolio segment. For the commercial and industrial loan segment a different methodology is used to estimate the allowance based on qualitative adjustments only, primarily trends in collateral, changes in nature and volume of the portfolio, concentration risk and external factors, due to the lack of historical loss rates and peer data available for that portfolio segment. Troubled Debt Restructurings Loans are reported as TDRs when the Company grants concessions to a borrower experiencing financial difficulties that it would not otherwise consider. Examples of such concessions include forgiveness of principal or accrued interest, extending the maturity date, or providing a lower interest rate than would be normally available for a transaction of similar risk. As a result of these concessions, restructured loans are impaired as the Company will not collect all amounts due, both principal and interest, in accordance with the terms of the original loan agreement. TDRs are individually evaluated for impairment and included in separately identified impairment disclosures. TDRs are measured at the present value of estimated cash flows using the loan’s effective rate at inception. If a TDR is considered to be a collateral dependent loan, the loan is reported, net, at the fair value of the collateral. For TDRs that subsequently default, the Company determined the amount of the allowance on the loan in accordance with the accounting policy for the allowance for loan losses on loans individually identified as impaired. The Company incorporates recent historical experience related to TDRs, including the performance of TDRs that subsequently defaulted, into the allowance calculation by loan portfolio segment. Loans Held-for-sale Certain loans originated or acquired and intended for sale in the secondary market are carried at the lower of cost or estimated fair value in the aggregate, as determined by outstanding commitments from investors. Net unrealized losses are recognized through a valuation allowance by charges to income. Gains or losses realized on the sales of loans are recognized at the time of sale and are determined by the difference between the net sales proceeds and the carrying value of the loans sold, adjusted for any servicing asset or liability. Gains and losses on sales of loans are included in noninterest income. Transfers of loans are accounted for as sales when control over the assets has been surrendered. Control over transferred assets is deemed to be surrendered when (1) the assets have been isolated from the Company, (2) the transferee obtains the right (free of conditions that constrain it from taking advantage of that right) to pledge or exchange the transferred assets, and (3) the Company does not maintain effective control through an agreement to purchase them before their maturity. In the event of a breach of representations and warranties, the Company may be required to repurchase a mortgage loan or indemnify the purchaser, and any subsequent loss on the mortgage loan may be borne by the Company. If there is no breach of a representation and warranty provision, the Company has no obligation to repurchase the loan or indemnify the investor against loss. In cases where the Company repurchases loans, it bears the subsequent credit loss on the loans. Repurchased loans are classified as held-for-sale and are initially recorded at fair value until disposition. The Company seeks to manage the risk of repurchase and associated credit exposure through our underwriting and quality assurance practices and by servicing mortgage loans to meet investor standards.
Federal Home Loan Bank ("FHLB") and Federal Reserve Bank ("FRB") Stock	Federal Home Loan Bank (“FHLB”) and Federal Reserve Bank (“FRB”) Stock The Bank is a member of the FHLB of San Francisco and the FRB system. Members are required to own a certain amount of stock based on the level of borrowings and other factors, and may invest in additional amounts. Investments in nonmarketable equity securities, such as FHLB stock and FRB stock, are recorded at cost, classified as a restricted security and periodically evaluated for impairment based on ultimate recovery of par value. Both cash and stock dividends are reported as income.
Premises and Equipment	Premises and Equipment Premises and equipment are stated at cost less accumulated depreciation and amortization. Amortization of leasehold improvements is computed on a straight-line basis over the terms of the leases or the estimated useful lives of the improvements, whichever is shorter. Depreciation of equipment, furniture, and automobiles is charged to operating expense over the estimated useful lives of the assets on a straight-line basis. The estimated useful lives of equipment, furniture, and automobiles range from three to ten years. Software is stated at cost less accumulated amortization. Amortization of software is computed on a straight-line basis over the shorter of the estimated useful life of the software or contract, and this period is typically three to five years.
Loan Commitments	Loan Commitments Financial instruments include off-balance sheet credit instruments, such as commitments to make loans and commercial letters of credit, issued to meet customer financing needs. The face amount for these items represents the exposure to loss, before considering customer collateral or ability to repay. Such financial instruments are recorded when they are funded.
Derivative Financial Instruments	Derivative Financial Instruments At the inception of a derivative contract, the Company designates the derivative as one of three types based on the Company’s intention and belief as the likely effectiveness as a hedge. These three types are (1) a hedge of fair value of a recognized asset or liability or of an unrecognized firm commitment (“fair value hedge”), (2) a hedge of a forecasted transaction or the variability of cash flows to be received or paid related to a recognized asset or liability (“cash flow hedge”), or (3) an instrument with no hedging designation (“stand alone derivative”). For a fair value hedge, the gain or loss on the derivative as well as the offsetting loss or gain on the hedged item, are recognized in current earnings as fair values change. For a cash flow hedge, the gain or loss on the derivative is reported in other comprehensive income and is reclassified into earnings in the same period during which the hedged transaction affects the earnings. The changes in fair value of derivatives that do not qualify for hedge accounting are reported in current earnings, as noninterest income. Net cash settlements on derivatives that qualify for hedge accounting are recorded in interest income or interest expense, based on the item being hedged. Net cash settlements on derivatives that do not qualify for hedge accounting are reported in noninterest income. Cash flows on hedges are classified in the cash flow statement the same as the cash flows of the item being hedged. The Company formally documents the relationship between the derivative and hedged items, as well as the risk-management objective and the strategy for undertaking hedge transactions at the inception of the hedging relationship. This documentation includes linking fair value or cash flow hedges to specific assets and liabilities on the balance sheet or to specific firm commitments or forecasted transactions. The Company also formally assesses, both at the hedge’s inception and on an ongoing basis, whether the derivative instruments that are used are highly effective in offsetting the changes in fair values or cash flows of the hedged items. The initial fair value of hedge components excluded from the assessment of effectiveness is recognized in the statement of financial condition under a systematic and rational method over the life of the hedging instrument and is presented in the same income statement line item as the earnings effect of the hedged item. Any difference between the change in the fair value of the hedge components excluded from the assessment of effectiveness and the amounts recognized in earnings is recorded as a component of other comprehensive income. The Company discontinues hedge accounting when it determines that the derivative is no longer effective in offsetting changes in fair values or cash flows of the hedged item, the derivative is settled or terminates, a hedged forecasted transaction is no longer probable, a hedged firm commitment is no longer firm, or treatment of the derivative as a hedge is no longer appropriate or intended. When hedge accounting is discontinued, subsequent changes in fair value of the derivative are recorded as noninterest income. When a fair value hedge is discontinued, the hedged asset or liability is no longer adjusted for changes in fair value and the existing basis adjustment is amortized or accreted over the remaining life of the asset or liability. When a cash flow hedge is discontinued but the hedged cash flows or forecasted transactions are still expected to occur, gains or losses that were accumulated in other comprehensive income are amortized into earnings over the same periods which the hedged transactions will affect earnings. The Company is exposed to losses if a counterparty fails to make its payments under a contract in which the Company is in the net receiving position. The Company anticipates that the counterparties will be able to fully satisfy their obligation under the agreements. All the contracts to which the Company is a party settle monthly or quarterly. In addition, the Company obtains collateral above certain thresholds of the fair value of its hedges for each counterparty based upon their credit standing and the Company has netting agreements with the dealers with which it does business. The Company has elected to not offset fair value amounts and present derivative assets and liabilities on a gross basis in the statement of financial condition.
Income Taxes	Income Taxes Income tax expense is the total of the current year income tax due or refundable and the change in deferred tax assets and liabilities. Deferred tax assets and liabilities are recognized for the future tax amounts attributable to differences between the financial statement carrying amounts of assets and liabilities and their respective tax bases, computed using enacted tax rates. The effect on deferred tax assets and liabilities of a change in tax rates is recognized in income in the period that includes the enactment date. A valuation allowance, if needed, reduces deferred tax assets to the amount expected to be realized. The Company accounts for uncertainty in tax positions taken or expected to be taken on a tax return in accordance with FASB ASC Topic 740, Accounting for Income Taxes, and provides that the tax effects from an uncertain tax position can be recognized in the financial statements only if, based on its merits, the position is more likely than not to be sustained on audit by the taxing authorities. Management believes that all tax positions taken to date are highly certain and, accordingly, no accounting adjustment has been made to the financial statements. Interest and penalties, if any, related to uncertain tax positions are recorded as part of income tax expense.
Stock-based Compensation	Stock-based Compensation The Company accounts for stock-based compensation in accordance with FASB ASC Topic 718, Compensation—Stock Compensation, that generally requires entities to recognize the cost of employee services received in exchange for awards of stock options, restricted stock or other equity instruments, based on the grant date fair value of those awards. Compensation cost is recognized for awards issued to employees based on the fair value of these awards at the date of grant. A Black-Scholes model is utilized to estimate the fair value of stock options. This cost is recognized over the period which an employee is required to provide services in exchange for the award, generally the vesting period.
Fair Value Measurement	Fair Value Measurement The Company measures and presents fair values in accordance with FASB ASC Topic 820, Fair Value Measurement, that defines fair value, establishes a framework for measuring fair value, and requires disclosures about fair value measurements. This standard establishes a fair value hierarchy about the assumptions used to measure fair value and clarifies assumptions about risk and the effect of a restriction on the sale or use of an asset. Fair value is defined as the exchange price that would be received for an asset or paid to transfer a liability (an exit price) in the principal or most advantageous market for the asset or liability in an orderly transaction between market participants on the measurement date. This standard’s fair value hierarchy requires an entity to maximize the use of observable inputs and minimize the use of unobservable inputs when measuring fair value. The standard describes three levels of inputs that may be used to measure fair value: Level 1—Quoted prices (unadjusted) for identical assets or liabilities in active markets that the entity has the ability to access as of the measurement date. Level 2—Significant observable inputs other than Level 1 prices, such as quoted prices for similar assets or liabilities; quoted prices in markets that are not active; or other inputs that are observable or can be corroborated by observable market data. Level 3—Significant unobservable inputs that reflect a Company’s own assumptions about the assumptions that market participants would use in pricing an asset or liability.
Revenue Recognition	Revenue Recognition On January 1, 2018, the Company adopted FASB ASC 606, Revenue from Contracts with Customers (“ASC 606”), which establishes a single framework for recognizing revenue from contracts with customers that fall within its scope. The core principle of the guidance requires an entity to recognize revenue to depict the transfer of promised goods or services to customers in an amount that reflects the consideration that it expects to be entitled to receive in exchange for those goods or services recognized as performance obligations are satisfied. The majority of the Company's revenues are not subject to ASC 606, including revenue generated from financial instruments, such as loans, letters of credit, and derivatives and investment securities, as these activities are subject to other applicable GAAP. Revenue streams within the scope of and accounted under ASC 606 include service charges and fees on deposit accounts, fees from other services the Company provides its customers, such as mortgage warehouse fee income and foreign exchange fee income and gains and losses from the sale of property, premises and equipment. These revenue streams are presented in the Company's consolidated statements of operations as components of noninterest income. Service charges on deposit accounts and other service fee income consist of periodic service charges on deposit accounts and transaction based fees such as those related to wire transfer fees, ACH fees, stop payment fees, insufficient funds fees, foreign exchange fee income and mortgage warehouse fees. Performance obligations for periodic service charges are typically short-term in nature, can be canceled anytime by the customer or the Company and are generally satisfied over a monthly period, while performance obligations for other transaction based fees are typically satisfied at a point in time (which may consist of only a few moments to perform the service or transaction) with no further obligation beyond the completion of the service or transaction. Periodic service charges are generally collected directly from a customer’s deposit account on a monthly basis, at the end of a statement cycle, while transaction-based service charges are typically collected and earned at the time of or soon after the service is performed. Other revenue streams that may be applicable to the Company include gains and losses from the sale of non-financial assets such as property, premises and equipment. The Company accounts for these revenue streams in accordance with ASC 610-20, which requires the Company to refer to guidance in ASC 606 in the application of certain measurement and recognition concepts. The Company records gains and losses on the sale of non-financial assets when control of the asset has been surrendered to the buyer, which generally occurs at a specific point in time.
Operating Segments	Operating Segments While the chief decision-makers monitor the revenue streams of the various products and services, operations are managed and financial performance is evaluated on a Company-wide basis. Operating results are not reviewed by senior management to make resource allocation or performance decisions. Accordingly, all of the financial service operations are considered by management to be aggregated in one reportable operating segment.
Earnings Per Share	Earnings Per Share Basic earnings per share is computed on the basis of the weighted average number of common shares outstanding during the year. Diluted earnings per share is computed on the basis of the weighted average number of common shares outstanding and any dilutive common equivalent shares resulting from stock options or awards.
Comprehensive Income	Comprehensive Income The Company presents comprehensive income in accordance with FASB ASC Topic 220, Comprehensive Income, that requires the disclosure of comprehensive income (loss) and its components. Other comprehensive income (loss) includes unrealized gains and losses on securities available-for-sale and the change in the fair value of cash flow hedges, net of deferred tax effects, which are also recognized as a separate component of equity.
Recently Issued Accounting Pronouncements Not Yet Effective	Recently Issued Accounting Pronouncements Not Yet Effective In June 2016, the Financial Accounting Standards Board (the “FASB”) issued Accounting Standards Update (or “ASU”) 2016-13, Financial Instruments—Credit Losses (Topic 326) to replace the incurred loss model with an expected loss model, which is referred to as the current expected credit loss (or “CECL”) model. The CECL model is applicable to the measurement of credit losses on financial assets measured at amortized cost, including loan receivables, held to maturity debt securities, and reinsurance receivables. It also applies to off-balance sheet credit exposures not accounted for as insurance (loan commitments, standby letters of credit, financial guarantees, and other similar instruments) and net investments in leases recognized by a lessor. These amendments were initially effective for fiscal years beginning after December 15, 2019 for SEC registrants and after December 15, 2020, for Public Business Entities, or PBEs. In November 2019, the FASB issued ASU 2019-10, Financial Instruments—Credit Losses (Topic 326), Derivatives and Hedging (Topic 815), and Leases (Topic 842): Effective Dates, which finalized the delay of the effective date for smaller reporting companies, as of the ASU 2019-10 effective date, such as the Company to apply the standards related to CECL, until fiscal years beginning after December 15, 2022. For debt securities with other than temporary impairment (OTTI), the guidance will be applied prospectively and for existing purchased credit impaired (PCI) assets will be grandfathered and classified as purchased credit deteriorated (PCD) assets at the date of adoption. The asset will be grossed up for the allowance for expected credit losses for all PCD assets at the date of adoption and will continue to recognize the noncredit discount in interest income based on the yield such assets as of the adoption date. Subsequent changes in expected credit losses will be recorded through the allowance. For all other assets with the scope of CECL, the cumulative effect adjustment will be recognized in retained earnings as of the beginning of the first reporting period in which the guidance is effective. In November 2018, the FASB issued ASU 2018-19, Codification Improvements to Topic 326, Financial Instruments—Credit Losses, which clarify that receivables arising from operating leases are not within the scope of Subtopic 326-20. Instead, impairment of receivables arising from operating leases should be accounted for in accordance with Topic 842, Leases. The Company formed a CECL implementation committee in 2018 which prepared a project plan to migrate towards the adoption date. As part of the project plan, the Company contracted a third-party vendor to assist in the application and analysis of ASU 2016-13 as well as a third party vendor to perform an independent model validation. As part of this process, the Company has determined preliminary loan pool segmentation under CECL, as well as evaluated the key economic loss drivers for each segment. The Company operationalized an initial CECL model during the second quarter of 2019 and is running this preliminary CECL model alongside the existing incurred loss methodology. The Company intends to continue to refine and run the model until the expected adoption date on January 1, 2023. The Company continues to evaluate the effects of ASU 2016-13 on its financial statements and disclosures. In March 2020, the FASB issued ASU 2020-04, Reference Rate Reform (Topic 848): Facilitation of the Effects of Reference Rate Reform on Financial Reporting (or “ASU 2020-04”), which provides temporary, optional guidance to ease the potential burden in accounting for, or recognizing the effects of, the transition away from the London Interbank Offered Rate (or “LIBOR”) or other interbank offered rate (reference rates) on financial reporting. On March 5, 2021, the U.K. Financial Conduct Authority, the regulatory supervisor for ICE Benchmark Administration, the administrator of LIBOR, announced that the overnight and one, three, six and twelve month USD LIBOR will be discontinued on June 30, 2023. It was originally expected that LIBOR would be discontinued by the end of 2021. To help with the transition to new reference rates, the ASU provides optional expedients and exceptions for applying GAAP to affected contract modifications and hedge accounting relationships. The guidance is applicable only to contracts or hedge accounting relationships that reference LIBOR or another reference rate expected to be discontinued. The expedients and exceptions in this update are available to all entities starting March 12, 2020 through December 31, 2022. In January 2020, the FASB issued ASU 2021-01, Reference Rate Reform (Topic 848), which clarifies the scope of Topic 848 to include derivative instruments impacted by discounting transition. The Company has created a subcommittee of the Asset Liability Management Committee to address the LIBOR transition and phase-out issues. The Company has identified its LIBOR-based contracts that will be impacted by the transition away from of LIBOR, and is incorporating fallback language in negotiated contracts and incorporating non-LIBOR reference rate and/or fallback language in new contracts to prepare for these changes. The Company is evaluating the impact that ASU 2020-04 will have on those financial assets where LIBOR is used as an index rate. Except for the updated standards discussed above, there have been no new accounting pronouncements not yet effective that have significance, or potential significance, to the Company’s consolidated financial statements.

Securities (Tables)

12 Months Ended

Dec. 31, 2021

Investments, Debt and Equity Securities [Abstract]

Schedule of Available-for-Sale Securities and Gross Unrealized Gains and Losses

The fair value of available-for-sale securities and their related gross unrealized gains and losses at the dates indicated are as follows:


	Available-for-sale securities
	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses		Fair Value

	(Dollars in thousands)
December 31, 2021

U.S. agency securities - excluding mortgage-backed securities	$	1,177,452	$	7,320	$	(6,005)	$	1,178,767
Residential mortgage-backed securities:
Government agency mortgage-backed securities	1,428,365		130		(14,378)		1,414,117
Government agency collateralized mortgage obligation	1,659,125		1,617		(15,739)		1,645,003
Private-label collateralized mortgage obligation	1,425		19		(11)		1,433
Commercial mortgage-backed securities:
Government agency mortgage-backed securities	1,106,680		1,886		(4,962)		1,103,604
Government agency collateralized mortgage obligation	212,266		19		(1,370)		210,915
Private-label collateralized mortgage obligation	144,204		227		(797)		143,634
Municipal bonds:
Tax-exempt	2,272,794		33,153		(8,210)		2,297,737
Taxable	403,279		341		(6,016)		397,604
Asset backed securities:
Government sponsored student loan pools	233,374		97		(1,026)		232,445
	$	8,638,964	$	44,809	$	(58,514)	$	8,625,259


	Available-for-sale securities
	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses		Fair Value

	(Dollars in thousands)
December 31, 2020


Residential mortgage-backed securities:
Government agency mortgage-backed securities	$	5,701	$	18	$	(55)	$	5,664
Government agency collateralized mortgage obligation	197,978		371		(298)		198,051
Private-label collateralized mortgage obligation	20,544		399		(256)		20,687
Commercial mortgage-backed securities:


Private-label collateralized mortgage obligation	164,214		18,322		—		182,536
Municipal bonds:
Tax-exempt	246,159		24,200		—		270,359
Taxable	15,307		695		—		16,002
Asset backed securities:
Government sponsored student loan pools	248,848		17		(3,149)		245,716
	$	898,751	$	44,022	$	(3,758)	$	939,015

Schedule of Securities with Unrealized Losses

Securities with unrealized losses as of the dates indicated, aggregated by investment category and length of time that individual securities have been in a continuous unrealized loss position, are as follows:


	Available-for-sale securities
	Less than 12 Months				12 Months or More				Total
	Fair Value		Unrealized Losses		Fair Value		Unrealized Losses		Fair Value		Unrealized Losses

	(Dollars in thousands)
December 31, 2021

U.S. agency securities - excluding mortgage-backed securities	$	761,711	$	(6,005)	$	—	$	—	$	761,711	$	(6,005)
Residential mortgage-backed securities:
Government agency mortgage-backed securities	1,357,080		(14,378)		70		—		1,357,150		(14,378)
Government agency collateralized mortgage obligation	1,513,388		(15,732)		650		(7)		1,514,038		(15,739)
Private-label collateralized mortgage obligation	—		—		433		(11)		433		(11)
Commercial mortgage-backed securities:
Government agency mortgage-backed securities	435,055		(4,962)		—		—		435,055		(4,962)
Government agency collateralized mortgage obligation	189,397		(1,370)		—		—		189,397		(1,370)
Private-label collateralized mortgage obligation	98,173		(656)		6,791		(141)		104,964		(797)
Municipal bonds:
Tax-exempt	1,025,689		(8,210)		—		—		1,025,689		(8,210)
Taxable	339,041		(6,016)		—		—		339,041		(6,016)
Asset backed securities:
Government sponsored student loan pools	168,204		(803)		32,783		(223)		200,987		(1,026)
	$	5,887,738	$	(58,132)	$	40,727	$	(382)	$	5,928,465	$	(58,514)


	Available-for-sale securities
	Less than 12 Months				12 Months or More				Total
	Fair Value		Unrealized Losses		Fair Value		Unrealized Losses		Fair Value		Unrealized Losses

	(Dollars in thousands)
December 31, 2020


Residential mortgage-backed securities:
Government agency mortgage-backed securities	$	5,165	$	(55)	$	—	$	—	$	5,165	$	(55)
Government agency collateralized mortgage obligation	120,912		(172)		56,976		(126)		177,888		(298)
Private-label collateralized mortgage obligation	290		(7)		9,950		(249)		10,240		(256)




Asset backed securities:
Government sponsored student loan pools	—		—		240,825		(3,149)		240,825		(3,149)
	$	126,367	$	(234)	$	307,751	$	(3,524)	$	434,118	$	(3,758)

Schedule of Amortized Cost and Estimated Fair Value of Investment Securities by Contractual Maturity

The amortized cost and estimated fair value of investment securities as of the periods presented by contractual maturity are shown below. Expected maturities may differ from contractual maturities if borrowers have the right to call or prepay obligations with or without call or prepayment penalties. For purposes of the following table, the entire outstanding balance of residential and commercial mortgage-backed securities is categorized based on the final maturity date.


	December 31,
	2021				2020
	Amortized Cost		Fair Value		Amortized Cost		Fair Value

	(Dollars in thousands)
Available-for-sale securities
Within one year	$	—	$	—	$	—	$	—
After one year through five years	2,243		2,170		—		—
After five years through ten years	1,406,395		1,401,733		14,021		15,694
After ten years	7,230,326		7,221,356		884,730		923,321
Total	$	8,638,964	$	8,625,259	$	898,751	$	939,015

Loans (Tables)

12 Months Ended

Dec. 31, 2021

Receivables [Abstract]

Schedule of Loans

A summary of loans as of the periods presented are as follows:


	December 31,
	2021		2020

	(Dollars in thousands)
Real estate loans:
One-to-four family	$	105,098	$	187,855
Multi-family	56,751		77,126
Commercial	210,136		301,901
Construction	7,573		6,272
Commercial and industrial	335,862		78,909

Reverse mortgage and other	1,410		1,495
Mortgage warehouse	177,115		97,903
Total gross loans held-for-investment	893,945		751,461
Deferred fees, net	275		2,206
Total loans held-for-investment	894,220		753,667
Allowance for loan losses	(6,916)		(6,916)
Total loans held-for-investment, net	$	887,304	$	746,751
Total loans held-for-sale(1)	$	893,194	$	865,961

________________________

(1)Loans held-for-sale are comprised entirely of mortgage warehouse loans for all periods presented

Schedule of Allowance for Loan Losses

The following tables present the allocation of the allowance for loan losses, as well as the activity in the allowance by loan class, and recorded investment in loans held-for-investment as of and for the periods presented:


	Year Ended December 31, 2021
	One-to -Four Family		Multi- Family		Commercial Real Estate		Construction		Commercial and Industrial		Reverse Mortgage and Other		Mortgage Warehouse		Total

	(Dollars in thousands)
Balance, December 31, 2020	$	1,245	$	878	$	1,810	$	590	$	1,931	$	39	$	423	$	6,916
Charge-offs	—		—		—		—		—		—		—		—
Recoveries	—		—		—		—		—		—		—		—
Provision for loan losses	(222)		(196)		207		186		(365)		(27)		417		—
Balance, December 31, 2021	$	1,023	$	682	$	2,017	$	776	$	1,566	$	12	$	840	$	6,916


	December 31, 2021
	One-to -Four Family		Multi- Family		Commercial Real Estate		Construction		Commercial and Industrial		Reverse Mortgage and Other		Mortgage Warehouse		Total

	(Dollars in thousands)
Amount of allowance attributed to:
Specifically evaluated impaired loans	$	29	$	—	$	—	$	—	$	—	$	—	$	—	$	29
General portfolio allocation	994		682		2,017		776		1,566		12		840		6,887
Total allowance for loan losses	$	1,023	$	682	$	2,017	$	776	$	1,566	$	12	$	840	$	6,916
Loans evaluated for impairment:
Specifically evaluated	$	4,229	$	—	$	1,956	$	—	$	—	$	923	$	—	$	7,108
Collectively evaluated	101,609		56,855		208,170		7,502		335,362		499		177,115		887,112
Total loans held-for-investment	$	105,838	$	56,855	$	210,126	$	7,502	$	335,362	$	1,422	$	177,115	$	894,220


	Year Ended December 31, 2020
	One-to -Four Family		Multi- Family		Commercial Real Estate		Construction		Commercial and Industrial		Reverse Mortgage and Other		Mortgage Warehouse		Total

	(Dollars in thousands)
Balance, December 31, 2019	$	2,051	$	653	$	2,791	$	96	$	312	$	38	$	250	$	6,191
Charge-offs	(17)		—		—		—		—		—		—		(17)
Recoveries	—		—		—		—		—		—		—		—
Provision for loan losses	(789)		225		(981)		494		1,619		1		173		742
Balance, December 31, 2020	$	1,245	$	878	$	1,810	$	590	$	1,931	$	39	$	423	$	6,916


	December 31, 2020
	One-to -Four Family		Multi- Family		Commercial Real Estate		Construction		Commercial and Industrial		Reverse Mortgage and Other		Mortgage Warehouse		Total

	(Dollars in thousands)
Amount of allowance attributed to:
Specifically evaluated impaired loans	$	11	$	—	$	—	$	—	$	—	$	29	$	—	$	40
General portfolio allocation	1,234		878		1,810		590		1,931		10		423		6,876
Total allowance for loan losses	$	1,245	$	878	$	1,810	$	590	$	1,931	$	39	$	423	$	6,916
Loans evaluated for impairment:
Specifically evaluated	$	5,795	$	—	$	9,713	$	—	$	274	$	879	$	—	$	16,661
Collectively evaluated	184,405		77,288		292,367		6,137		78,275		631		97,903		737,006
Total loans held-for-investment	$	190,200	$	77,288	$	302,080	$	6,137	$	78,549	$	1,510	$	97,903	$	753,667

Schedule of Investments in Impaired Loans

The following tables provide a summary of the Company’s investment in impaired loans as of and for the year then ended:


	December 31, 2021
	Unpaid Principal Balance		Recorded Investment		Related Allowance		Average Recorded Investment		Interest Income Recognized

	(Dollars in thousands)
With no related allowance recorded:
Real estate loans:
One-to-four family	$	4,616	$	3,927	$	—	$	5,719	$	303

Commercial	1,955		1,956		—		7,906		477

Commercial and industrial	—		—		—		182		15

Reverse mortgage and other	914		923		—		825		—

	7,485		6,806		—		14,632		795
With an allowance recorded:
Real estate loans:
One-to-four family	323		302		29		258		12





Reverse mortgage and other	—		—		—		65		—

	323		302		29		323		12
Total impaired loans	$	7,808	$	7,108	$	29	$	14,955	$	807


	December 31, 2020
	Unpaid Principal Balance		Recorded Investment		Related Allowance		Average Recorded Investment		Interest Income Recognized

	(Dollars in thousands)
With no related allowance recorded:
Real estate loans:
One-to-four family	$	6,432	$	5,730	$	—	$	3,748	$	215

Commercial	9,723		9,713		—		4,620		522

Commercial and industrial	274		274		—		1,680		25

Reverse mortgage and other	523		531		—		516		—

	16,952		16,248		—		10,564		762
With an allowance recorded:
Real estate loans:
One-to-four family	64		65		11		65		5





Reverse mortgage and other	346		348		29		342		—

	410		413		40		407		5
Total impaired loans	$	17,362	$	16,661	$	40	$	10,971	$	767

Schedule of Aging Analysis by Loan Class

The following tables present by loan class the aging analysis based on contractual terms, nonaccrual loans, and the Company’s recorded investment in loans held-for-investment as of the periods presented:


	December 31, 2021
	30-59 Days Past Due		60-89 Days Past Due		Greater than 89 Days Past Due		Total Past Due		Current		Total		Nonaccruing		Loans Receivable > 89 Days and Accruing

	(Dollars in thousands)
Real estate loans:
One-to-four family	$	1,176	$	—	$	2,985	$	4,161	$	101,677	$	105,838	$	3,080	$	—
Multi-family	—		—		—		—		56,855		56,855		—		—
Commercial	—		—		—		—		210,126		210,126		—		—
Construction	—		—		—		—		7,502		7,502		—		—
Commercial and industrial	—		—		—		—		335,362		335,362		—		—

Reverse mortgage and other	—		—		—		—		1,422		1,422		923		—
Mortgage warehouse	—		—		—		—		177,115		177,115		—		—
Total loans held-for-investment	$	1,176	$	—	$	2,985	$	4,161	$	890,059	$	894,220	$	4,003	$	—


	December 31, 2020
	30-59 Days Past Due		60-89 Days Past Due		Greater than 89 Days Past Due		Total Past Due		Current		Total		Nonaccruing		Loans Receivable > 89 Days and Accruing

	(Dollars in thousands)
Real estate loans:
One-to-four family	$	1,006	$	26	$	3,866	$	4,898	$	185,302	$	190,200	$	4,105	$	—
Multi-family	206		—		—		206		77,082		77,288		—		—
Commercial	—		—		—		—		302,080		302,080		—		—
Construction	—		—		—		—		6,137		6,137		—		—
Commercial and industrial	—		—		—		—		78,549		78,549		—		—

Reverse mortgage and other	—		—		—		—		1,510		1,510		879		—
Mortgage warehouse	—		—		—		—		97,903		97,903		—		—
Total loans held-for-investment	$	1,212	$	26	$	3,866	$	5,104	$	748,563	$	753,667	$	4,984	$	—

Schedule of Modifications of Loans Classified as TDRs

Modifications of loans classified as TDRs during the periods presented, are as follows:

Year Ended December 31, 2021

Number of
Loans

Pre-
Modifications
Outstanding
Recorded
Investment

Post-
Modifications
Outstanding
Recorded
Investment

(Dollars in thousands)

Troubled debt restructurings:

Real estate loans:

One-to-four family

2

$

547

$

590

Schedule of Financing Receivable Credit Quality Indicators Description

The Company uses the following definitions for risk ratings:


Pass:						Loans in all classes that are not adversely rated, are contractually current as to principal and interest, and are otherwise in compliance with the contractual terms of the loan agreement. Management believes that there is a low likelihood of loss related to those loans that are considered pass.

Special mention:						Loans classified as special mention have a potential weakness that deserves management’s close attention. If left uncorrected, these potential weaknesses may result in deterioration of the repayment prospects for the loan or of the institution’s credit position at some future date.

Substandard:						Loans classified as substandard are inadequately protected by the current net worth and paying capacity of the obligor or of the collateral pledged, if any. Loans so classified have a well-defined weakness or weaknesses that jeopardize the liquidation of the debt. They are characterized by the distinct possibility that the Company will sustain some loss if the deficiencies are not corrected.

Doubtful:						Loans classified as doubtful have all the weaknesses inherent in those classified as substandard, with the added characteristic that the weaknesses make collection or liquidation in full, on the basis of currently existing facts, conditions, and values, highly questionable and improbable.

Loss:						Credits rated as loss are charged-off. Management has no expectation of the recovery of any payments in respect of credits rated as loss.

Schedule of Financing Receivable Credit Quality Indicators

The following tables present by portfolio class the Company’s internal risk grading system as well as certain other information concerning the credit quality of the Company’s recorded investment in loans held-for-investment as of the periods presented. No assets were classified as loss or doubtful during the periods presented.


	Credit Risk Grades
	Pass		Special Mention		Substandard		Doubtful		Total

	(Dollars in thousands)
December 31, 2021
Real estate loans:
One-to-four family	$	102,307	$	451	$	3,080	$	—	$	105,838
Multi-family	56,855		—		—		—		56,855
Commercial	199,598		10,528		—		—		210,126
Construction	7,502		—		—		—		7,502
Commercial and industrial	335,362		—		—		—		335,362

Reverse mortgage and other	499		—		923		—		1,422
Mortgage warehouse	177,115		—		—		—		177,115
Total loans held-for-investment	$	879,238	$	10,979	$	4,003	$	—	$	894,220


	Credit Risk Grades
	Pass		Special Mention		Substandard		Doubtful		Total

	(Dollars in thousands)
December 31, 2020
Real estate loans:
One-to-four family	$	182,760	$	3,335	$	4,105	$	—	$	190,200
Multi-family	77,288		—		—		—		77,288
Commercial	288,471		5,854		7,755		—		302,080
Construction	6,137		—		—		—		6,137
Commercial and industrial	78,275		—		274		—		78,549

Reverse mortgage and other	631		—		879		—		1,510
Mortgage warehouse	97,903		—		—		—		97,903
Total loans held-for-investment	$	731,465	$	9,189	$	13,013	$	—	$	753,667

Schedule of Loans Held-for-Investment Purchased and/or Sold

The following table presents loans held-for-investment purchased and/or sold during the year by portfolio segment:


	December 31,
	2021				2020
	Purchases		Sales		Purchases		Sales

	(Dollars in thousands)
Real estate loans:
One-to-four family	$	—	$	—	$	89,873	$	—
Multi-family	1,040		—		—		—






	$	1,040	$	—	$	89,873	$	—

Premises and Equipment, Net (Tables)

12 Months Ended

Dec. 31, 2021

Property, Plant and Equipment [Abstract]

Schedule of Premises and Equipment

Year-end premises and equipment were as follows:


	December 31,
	2021		2020

	(Dollars in thousands)
Equipment, furniture, and software	$	8,286	$	6,381
Leasehold improvements	1,372		1,372

	9,658		7,753
Accumulated depreciation and amortization	(6,650)		(5,681)
Total premises and equipment, net	$	3,008	$	2,072

Schedule of Supplemental Balance Sheet Information of Leases

Supplemental balance sheet information related to leases were as follows:


		December 31,
		2021		2020

		(Dollars in thousands)
Operating leases	Balance Sheet Classification
Right-of-use assets	Other assets	$	4,457	$	1,799
Lease liabilities	Accrued expenses and other liabilities	5,233		3,376

Schedule of Weighted-Average Remaining Lease Term and Discount Rates of Leases

The weighted-average remaining lease term and discount rate were as follows:


	December 31,
	2021		2020
Weighted-average remaining lease term	4.7 years		2.0 years
Weighted-average discount rate	4.70	%	4.21	%

Schedule of Lease Expense

The components of lease expense for the periods presented were as follows:


	Year Ended December 31,
	2021		2020

	(Dollars in thousands)
Operating lease costs(1)	$	973	$	2,943
Short-term lease costs(2)	40		102
Variable lease costs	39		77
Less: Sublease income	(201)		(155)
Total lease costs	$	851	$	2,967

________________________

(1)Includes a $1.4 million impairment charge related to leased office space no longer in use for the year ended December 31, 2020.

(2)Short-term lease costs are for leases with a term of one year or less including terms of one month or less per accounting policy election.

Schedule of Maturities of Lease Liabilities

Maturities of lease liabilities were as follows:


	December 31, 2021
Operating leases	(Dollars in thousands)
2022	$	1,513
2023	991
2024	815
2025	820
2026	857
Thereafter	741
Total lease payments	5,737
Less: imputed lease interest	(504)
Total lease liabilities	$	5,233

Deposits (Tables)

12 Months Ended

Dec. 31, 2021

Deposits [Abstract]

Schedule of Composition of Deposits

The following table presents the composition of our deposits as of the dates presented:


	December 31,
	2021		2020

	(Dollars in thousands)
Noninterest bearing demand accounts	$	14,213,472	$	5,133,579
Interest bearing accounts:
Interest bearing demand accounts	7,455		42,143
Money market and savings accounts	69,161		71,460
Certificates of deposit	540		844
Interest bearing accounts	77,156		114,447





Total deposits	$	14,290,628	$	5,248,026

Schedule of Maturities of Certificates of Deposit

Certificates of deposit at December 31, 2021, are scheduled to mature as follows:


	Amount
Year Ended December 31,	(Dollars in thousands)
2022	$	448
2023	39
2024	53


Thereafter	—
Total	$	540

- Definition

Tabular disclosure of type of deposit liability.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher SEC
-Name Regulation S-K (SK)
-Number 229
-Section 1406
-Paragraph (e)

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher SEC
-Name Regulation S-K (SK)
-Number 229
-Section 1406
-Paragraph (f)
-Subparagraph (2)(i)(ii)

Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher SEC
-Name Regulation S-K (SK)
-Number 229
-Section 1406
-Paragraph (a)
-Subparagraph (1)

Reference 4: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher SEC
-Name Regulation S-K (SK)
-Number 229
-Section 1406
-Paragraph (f)
-Subparagraph (1)

Reference 5: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher SEC
-Name Regulation S-K (SK)
-Number 229
-Section 1406
-Paragraph (d)

Reference 6: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher SEC
-Name Regulation S-K (SK)
-Number 229
-Section 1406
-Paragraph (f)
-Subparagraph (2)(i)

Reference 7: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher SEC
-Name Regulation S-K (SK)
-Number 229
-Section 1406
-Paragraph (f)
-Subparagraph (2)(i)(iv)

Reference 8: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher SEC
-Name Regulation S-K (SK)
-Number 229
-Section 1406
-Paragraph (a)
-Subparagraph (5)

Reference 9: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher SEC
-Name Regulation S-K (SK)
-Number 229
-Section 1406
-Paragraph (f)
-Subparagraph (2)(i)(iii)

Reference 10: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher SEC
-Name Regulation S-K (SK)
-Number 229
-Section 1406
-Paragraph (a)
-Subparagraph (4)

Reference 11: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher SEC
-Name Regulation S-K (SK)
-Number 229
-Section 1406
-Paragraph (f)
-Subparagraph (2)

Reference 12: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher SEC
-Name Regulation S-K (SK)
-Number 229
-Section 1406
-Paragraph (c)

Reference 13: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher SEC
-Name Regulation S-K (SK)
-Number 229
-Section 1406
-Paragraph (a)
-Subparagraph (2)

Reference 14: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher SEC
-Name Regulation S-K (SK)
-Number 229
-Section 1406
-Paragraph (a)
-Subparagraph (3)

Reference 15: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher SEC
-Name Regulation S-K (SK)
-Number 229
-Section 1406
-Paragraph (a)

+ Details

Derivative and Hedging Activities (Tables)

12 Months Ended

Dec. 31, 2021

Derivative Instruments and Hedging Activities Disclosure [Abstract]

Schedule of Fair Value of Derivative Financial Instruments and Classification within Statement of Financial Condition

The table below presents the fair value of the Company’s derivative financial instruments as well as the classification within the consolidated statements of financial condition.

December 31,

2021

2020

Balance Sheet
Location

Fair Value

Balance Sheet
Location

Fair Value

(Dollars in thousands)

Derivatives designated as hedging instruments:

Cash flow hedge interest rate floor

Derivative assets

$

18,992

Derivative assets

$

30,766

Cash flow hedge interest rate cap

Derivative assets

—

Derivative assets

—

Fair value hedge interest rate swap

Derivative assets

—

Derivative assets

338

Fair value hedge interest rate cap

Derivative assets

15,064

Derivative assets

—

Schedule of Cumulative Basis Adjustments, Related Amortized Cost, and Effect of Fair Value Hedge Accounting

The following table presents the cumulative basis adjustments on hedged items designated as fair value hedges and the related amortized cost of those items as of the periods presented.


	Carrying Amount of the Hedged Asset (Liability)				Cumulative Amount of Fair Value Hedging Adjustments Included in the Carrying Amount of Hedged Assets/(Liabilities)
	December 31, 2021		December 31, 2020		December 31, 2021		December 31, 2020

	(Dollars in thousands)
Line Item in the Statement of Financial Condition of Hedged Item:
Securities available-for-sale	$	697,437	$	15,367	$	—	$	(278)

The following table presents the effect of fair value hedge accounting on the Company’s consolidated statements of operations for the periods presented.


	Location and Amount of Gain or (Loss) Recognized in Income on Fair Value Hedging Relationships
	Year Ended December 31,
	2021				2020
	Interest income - Taxable securities		Interest income - Tax-exempt securities		Interest income - Taxable securities		Interest income - Tax-exempt securities

	(Dollars in thousands)
Total interest income presented in the statement of operations in which the effects of fair value hedges are recorded	$	36,094	$	17,301	$	17,465	$	5,062
Effects of fair value hedging relationships
Interest rate contracts:
Hedged items	$	(626)	$	—	$	(390)	$	—
Derivatives designated as hedging instruments	515		—		355		—
Amount excluded from effectiveness testing recognized in earnings based on amortization approach	—		(1,729)		—		—

Schedule of Cash Flow Hedges Included in Accumulated Other Comprehensive Income (Loss)

The following table summarizes the effects of derivatives in cash flow and fair value hedging relationships designated as hedging instruments on the Company’s OCI and consolidated statements of operations for the periods presented:


	Amount of Gain (Loss) Recognized in OCI				Location of Gain (Loss) Reclassified from Accumulated OCI into Income	Amount of Gain (Loss) Reclassified from Accumulated OCI into Income
	Year Ended December 31,					Year Ended December 31,
	2021		2020			2021		2020

	(Dollars in thousands)
Derivatives designated as hedging instruments:
Cash flow hedge interest rate floor	$	(1,483)	$	6,167	Interest income - Other interest earning assets	$	560	$	745
Cash flow hedge interest rate floor	(5,931)		17,949		Interest income - Taxable securities	4,303		2,910
Cash flow hedge interest rate cap	—		(297)		Interest expense - Subordinated debentures	(402)		(309)
Fair value hedge interest rate cap(1)	(7,951)		—

_______________________

(1)Represents amounts excluded from the assessment of effectiveness for which the difference between changes in fair value and periodic amortization is recorded in other comprehensive income.

Income Taxes (Tables)

12 Months Ended

Dec. 31, 2021

Income Tax Disclosure [Abstract]

Schedule of Components of Income Tax Expense (Benefit)

Income tax expense consists of the following for the periods presented:


	Year Ended December 31,
	2021		2020

	(Dollars in thousands)
Current provision
Federal	$	3,556	$	3,441
State	4,391		2,121

	7,947		5,562
Federal deferred tax benefit	(614)		(286)
State deferred tax benefit	(458)		(120)

	(1,072)		(406)
Income tax expense	$	6,875	$	5,156

Schedule of Effective Income Tax Rate Reconciliation

Comparison of the federal statutory income tax rates to the Company’s effective income tax rates for the periods presented is as follows:


	Year Ended December 31,
	2021				2020
	Amount		Rate		Amount		Rate

	(Dollars in thousands)
Statutory federal tax	$	17,935	21.0	%	$	6,551	21.0	%
State tax, net of federal benefit	3,208		3.8	%	1,687		5.4	%

Tax credits	(409)		(0.5)	%	(290)		(0.9)	%
Tax-exempt income, net	(3,998)		(4.7)	%	(1,063)		(3.4)	%
Excess tax benefit from stock-based compensation	(9,846)		(11.5)	%	(1,681)		(5.4)	%
Other items, net	(15)		0.0	%	(48)		(0.2)	%
Actual tax expense	$	6,875	8.1	%	$	5,156	16.5	%

Schedule of Deferred Tax Assets and Liabilities

The tax effects of temporary differences that give rise to significant portions of the deferred tax assets and liabilities included in other assets are as follows:


	December 31,
	2021		2020

	(Dollars in thousands)
Deferred tax assets
Allowance for loan losses	$	2,027	$	1,941

Securities available-for-sale	4,016		—
Accrued vacation pay	633		448
Accrued bonus	402		301

State taxes	660		423
Operating lease liabilities	1,534		948

Other	987		279
Deferred tax assets	10,259		4,340
Deferred tax liabilities
Basis difference in fixed assets	(546)		(271)
Securities available-for-sale	—		(11,301)
Derivatives	(1,147)		(6,665)
Operating lease right-of-use assets	(1,307)		(505)


Other	(766)		(1,012)
Deferred tax liabilities	(3,766)		(19,754)
Deferred tax asset (liability), net	$	6,493	$	(15,414)

Commitments and Contingencies (Tables)

12 Months Ended

Dec. 31, 2021

Commitments and Contingencies Disclosure [Abstract]

Schedule of Off-Balance Sheet Items

The Company’s commitments associated with outstanding letters of credit and commitments to extend credit expiring by period as of the date indicated are summarized below. Since commitments associated with letters of credit and commitments to extend credit may expire unused, the amounts shown do not necessarily reflect the actual future cash funding requirements.


	December 31,
	2021		2020

	(Dollars in thousands)
Unfunded lines of credit	$	248,092	$	49,487
Letters of credit	484		133
Total credit extension commitments	$	248,576	$	49,620

Stock-based Compensation (Tables)

12 Months Ended

Dec. 31, 2021

Share-based Payment Arrangement [Abstract]

Schedule of Valuation Assumptions of Stock Options

The fair value of the option grants for the years ended December 31, 2021 and 2020 and were estimated on the date of the grant using the Black-Scholes option pricing model with the assumptions presented below:


	Year Ended December 31,
	2021			2020
Weighted-average assumptions used:
Risk-free interest rate	0.95		%	1.45		%
Expected term	6.0 years			6.2 years
Expected stock price volatility	42.44 %			30.88		%
Dividend yield	0.00		%	0.00		%

Weighted-average grant date fair value	$	52.78		$	4.93

Schedule of Stock Option Activity

A summary of stock option activity as of December 31, 2021 and changes during the year then ended is presented below:


	Number of Options	Weighted Average Exercise Price		Weighted Average Remaining Contractual Life (in years)	Aggregate Intrinsic Value (in thousands)
Outstanding at January 1, 2021	595,303	$	8.01
Granted	18,585	127.56
Exercised	(414,602)	5.39
Forfeited or expired	(8,095)	16.09
Outstanding at December 31, 2021	191,191	$	24.97	7.1 years	$	23,561
Exercisable at December 31, 2021	94,434	$	12.16	6.1 years	$	12,847
Vested or Expected to Vest at December 31, 2021	182,372	$	24.73	7.1 years	$	22,518

Schedule of Nonvested Restricted Stock Unit Award Activity

A summary of the status of the Company’s nonvested restricted stock unit awards as of December 31, 2021, and changes during the year then ended, is presented below:


	Number of Shares	Weighted-Average Grant Date Fair Value Per Share
Nonvested at January 1, 2021	58,690	$	15.61
Granted	31,788	121.61
Vested	(29,499)	15.17
Forfeited	(4,108)	50.91
Nonvested at December 31, 2021	56,871	$	72.53

Regulatory Capital (Tables)

12 Months Ended

Dec. 31, 2021

Regulated Operations [Abstract]

Schedule of Compliance with Regulatory Capital Requirements under Banking Regulations

Actual capital amounts and ratios for the Company and the Bank as of December 31, 2021 and 2020, are presented in the following tables:


	Actual				Minimum capital adequacy(1)				To be well capitalized
	Amount		Ratio		Amount		Ratio		Amount		Ratio

	(Dollars in thousands)
December 31, 2021
The Company
Tier 1 leverage ratio	$	1,631,257	11.07	%	$	589,614	4.00	%	N/A		N/A
Common equity tier 1 capital ratio	1,422,136		49.53	%	129,198		4.50	%	N/A		N/A
Tier 1 risk-based capital ratio	1,631,257		56.82	%	172,264		6.00	%	N/A		N/A
Total risk-based capital ratio	1,638,794		57.08	%	229,686		8.00	%	N/A		N/A
The Bank
Tier 1 leverage ratio	1,546,693		10.49	%	589,595		4.00	%	$	736,994	5.00	%
Common equity tier 1 capital ratio	1,546,693		53.89	%	129,162		4.50	%	186,567		6.50	%
Tier 1 risk-based capital ratio	1,546,693		53.89	%	172,216		6.00	%	229,622		8.00	%
Total risk-based capital ratio	1,554,230		54.15	%	229,622		8.00	%	287,027		10.00	%


	Actual				Minimum capital adequacy(1)				To be well capitalized
	Amount		Ratio		Amount		Ratio		Amount		Ratio

	(Dollars in thousands)
December 31, 2020
The Company
Tier 1 leverage ratio	$	263,763	8.29	%	$	127,338	4.00	%	N/A		N/A
Common equity tier 1 capital ratio	248,263		21.53	%	51,882		4.50	%	N/A		N/A
Tier 1 risk-based capital ratio	263,763		22.88	%	69,176		6.00	%	N/A		N/A
Total risk-based capital ratio	270,803		23.49	%	92,234		8.00	%	N/A		N/A
The Bank
Tier 1 leverage ratio	261,791		8.22	%	127,344		4.00	%	$	159,180	5.00	%
Common equity tier 1 capital ratio	261,791		22.71	%	51,869		4.50	%	74,923		6.50	%
Tier 1 risk-based capital ratio	261,791		22.71	%	69,159		6.00	%	92,212		8.00	%
Total risk-based capital ratio	268,831		23.32	%	92,212		8.00	%	115,265		10.00	%

________________________

(1)Minimum capital adequacy for common equity tier 1 capital ratio, tier 1 risk-based capital ratio and total risk-based capital ratio excludes the capital conservation buffer.

Fair Value (Tables)

12 Months Ended

Dec. 31, 2021

Fair Value Disclosures [Abstract]

Schedule of Assets and Liabilities Measured at Fair Value on Recurring Basis

As of December 31, 2021 and 2020, assets and liabilities measured at fair value on a recurring basis are as follows:


	Fair Value Measurements Using
	Quoted Prices in Active Markets for Identical Assets		Significant Other Observable Inputs		Significant Unobservable Inputs
	Level 1		Level 2		Level 3		Total

	(Dollars in thousands)
December 31, 2021
Assets

Securities available-for-sale	$	—	$	8,625,259	$	—	$	8,625,259
Derivative assets	—		34,056		—		34,056
	$	—	$	8,659,315	$	—	$	8,659,315


	Fair Value Measurements Using
	Quoted Prices in Active Markets for Identical Assets		Significant Other Observable Inputs		Significant Unobservable Inputs
	Level 1		Level 2		Level 3		Total

	(Dollars in thousands)
December 31, 2020
Assets

Securities available-for-sale	$	—	$	939,015	$	—	$	939,015
Derivative assets	—		31,104		—		31,104
	$	—	$	970,119	$	—	$	970,119

Schedule of Assets Measured at Fair Value on Non-Recurring Basis

As of December 31, 2020 assets measured at fair value on a non-recurring basis are summarized as follows:

Fair Value Measurements Using

Quoted Prices
in Active
Markets for
Identical Assets

Significant Other
Observable
Inputs

Significant
Unobservable
Inputs

Level 1

Level 2

Level 3

Total

(Dollars in thousands)

December 31, 2020

Assets

Impaired loans:

Reverse mortgage

$

—

$

—

$

317

$

317

Schedule of Fair Value Measurement Inputs and Valuation Techniques

The following table presents the valuation methodology and unobservable inputs for Level 3 assets measured at fair value on a nonrecurring basis as of the date indicated:

Fair Value

Valuation Technique(s)

Significant
Unobservable
Inputs

Range

Weighted Average(1)

(Dollars in thousands)

December 31, 2020

Collateral-dependent impaired loans

$

317

Market comparable properties

Marketability discount

10.0

%

10.0

%

________________________

(1)Unobservable inputs were weighted by the relative fair value of the instruments.

Schedule of Fair Value by Balance Sheet Grouping

The following tables present information about the Company’s assets and liabilities that are not measured at fair value in the consolidated statements of financial condition as of the dates presented:


	Carrying Amount		Fair Value Measurements Using
			Level 1		Level 2		Level 3		Total

	(Dollars in thousands)
December 31, 2021
Financial assets:
Cash and due from banks	$	208,193	$	208,193	$	—	$	—	$	208,193
Interest earning deposits	5,179,753		5,179,753		—		—		5,179,753

Loans held-for-sale	893,194		—		893,194		—		893,194
Loans held-for-investment, net	887,304		—		—		891,166		891,166
Accrued interest receivable	40,370		41		8,980		31,349		40,370
Financial liabilities:
Deposits	$	14,290,628	$	—	$	14,167,200	$	—	$	14,167,200




Subordinated debentures, net	15,845		—		15,646		—		15,646
Accrued interest payable	223		—		223		—		223


	Carrying Amount		Fair Value Measurements Using
			Level 1		Level 2		Level 3		Total

	(Dollars in thousands)
December 31, 2020
Financial assets:
Cash and due from banks	$	16,405	$	16,405	$	—	$	—	$	16,405
Interest earning deposits	2,945,682		2,945,682		—		—		2,945,682

Loans held-for-sale	865,961		—		865,961		—		865,961
Loans held-for-investment, net	746,751		—		—		751,165		751,165
Accrued interest receivable	8,698		8		2,630		6,060		8,698
Financial liabilities:
Deposits	$	5,248,026	$	—	$	5,458,900	$	—	$	5,458,900




Subordinated debentures, net	15,831		—		15,231		—		15,231
Accrued interest payable	260		—		260		—		260

Earnings Per Share (Tables)

12 Months Ended

Dec. 31, 2021

Earnings Per Share [Abstract]

Schedule of Earnings Per Share, Basic and Diluted

The computation of basic and diluted earnings per share is shown below.


	Year Ended December 31,
	2021		2020

	(Dollars in thousands, except per share data)
Basic
Net income	$	78,528	$	26,038
Less: Dividends paid to preferred shareholders	3,016		—
Net income available to common shareholders	$	75,512	$	26,038
Weighted average common shares outstanding	25,582		18,691
Basic earnings per common share	$	2.95	$	1.39
Diluted
Net income available to common shareholders	$	75,512	$	26,038
Weighted average common shares outstanding for basic earnings per common share	25,582		18,691
Add: Dilutive effects of stock-based awards	340		486
Average shares and dilutive potential common shares	25,922		19,177
Dilutive earnings per common share	$	2.91	$	1.36

Shareholders' Equity (Tables)

12 Months Ended

Dec. 31, 2021

Equity [Abstract]

Schedule of Accumulated Other Comprehensive Income (Loss)

The following table shows for the years ended December 31, 2021 and 2020, changes in the balances of each component of accumulated other comprehensive income, net of tax:


	Unrealized Gains/ (Losses) on Available-for- Sale Securities		Derivative Asset/(Liability)		Accumulated Other Comprehensive Income/(Loss)

	(Dollars in thousands)
Beginning balance, January 1, 2020	$	4,071	$	2,330	$	6,401
Current period other comprehensive income before reclassification	27,566		15,932		43,498
Amounts reclassified from accumulated other comprehensive income	(2,679)		(1,184)		(3,863)
Ending balance, December 31, 2020	28,958		17,078		46,036
Current period other comprehensive income before reclassification	(34,896)		(12,847)		(47,743)
Amounts reclassified from accumulated other comprehensive income	(3,750)		(1,465)		(5,215)
Ending balance, December 31, 2021	$	(9,688)	$	2,766	$	(6,922)

Parent Company Financial Information (Tables)

12 Months Ended

Dec. 31, 2021

Condensed Financial Information Disclosure [Abstract]

Schedule of Condensed Financial Statements

Condensed financial information for the Corporation (parent company only) is as follows:

Statements of Financial Condition


	December 31,
	2021		2020

	(Dollars in thousands)
ASSETS
Cash and due from banks	$	84,736	$	1,991


Investments in subsidiaries	1,540,392		308,740
Other assets	245		236
Total assets	$	1,625,373	$	310,967
LIABILITIES AND SHAREHOLDERS’ EQUITY

Subordinated debentures, net	$	15,845	$	15,831
Accrued expenses and other liabilities	692		837
Total liabilities	16,537		16,668
Commitments and contingencies
Preferred stock	2		—
Class A common stock	304		188
Class B non-voting common stock	—		1
Additional paid-in capital	1,421,592		129,726
Retained earnings	193,860		118,348
Accumulated other comprehensive (loss) income	(6,922)		46,036
Total shareholders’ equity	1,608,836		294,299
Total liabilities and shareholders’ equity	$	1,625,373	$	310,967

Statements of Operations


	Year Ended December 31,
	2021		2020

	(Dollars in thousands)



Total interest income	$	17	$	22
Interest expense

Subordinated debentures and other	993		1,083
Total interest expense	993		1,083
Net interest expense	(976)		(1,061)
Noninterest expense
Salaries and employee benefits	1,219		1,071
Occupancy and equipment	102		102
Communications and data processing	174		176
Professional services	1,905		1,104
Correspondent bank charges	—		1
Other general and administrative	429		280
Total noninterest expense	3,829		2,734
Loss before income taxes and equity in undistributed earnings of subsidiaries	(4,805)		(3,795)
Income tax benefit	(1,362)		(1,032)
Equity in undistributed earnings of subsidiaries	81,971		28,801
Net income	78,528		26,038
Dividends on preferred stock	(3,016)		—
Net income available to common shareholders	$	75,512	$	26,038

Statements of Cash Flows


	Year Ended December 31,
	2021		2020

	(Dollars in thousands)
Cash flows from operating activities
Net income	$	78,528	$	26,038
Adjustments to reconcile net income to net cash used in operating activities:
Equity in undistributed earnings of subsidiaries	(81,971)		(28,801)
Other, net	333		323
Changes in operating assets and liabilities:
Other assets	(35)		187
Accrued expenses and other liabilities	(145)		(424)
Net cash used in operating activities	(3,290)		(2,677)
Cash flows from investing activities
Investments in subsidiaries	(1,201,000)		(7,500)
Net cash used in investing activities	(1,201,000)		(7,500)
Cash flows from financing activities


Payments made on notes payable	—		(3,714)
Proceeds from common stock issuance, net	1,097,815		—

Proceeds from preferred stock issuance, net	193,621		—

Payments of preferred stock dividends	(3,016)		—
Proceeds from stock option exercise	1,923		41
Taxes paid related to net share settlement of equity awards	(3,308)		(3,335)
Other, net	—		90
Net cash provided by (used in) financing activities	1,287,035		(6,918)
Net increase (decrease) in cash and cash equivalents	82,745		(17,095)
Cash and cash equivalents, beginning of year	1,991		19,086
Cash and cash equivalents, end of year	$	84,736	$	1,991

Nature of Business and Summary of Significant Accounting Policies - Premises and equipment (Details)	12 Months Ended
	Dec. 31, 2021
Equipment, Furniture and Automobiles \| Minimum
Property, Plant and Equipment [Line Items]
Estimated useful life	3 years
Equipment, Furniture and Automobiles \| Maximum
Property, Plant and Equipment [Line Items]
Estimated useful life	10 years
Software \| Minimum
Property, Plant and Equipment [Line Items]
Estimated useful life	3 years
Software \| Maximum
Property, Plant and Equipment [Line Items]
Estimated useful life	5 years

Nature of Business and Summary of Significant Accounting Policies - Operating Segments (Details)	12 Months Ended
	Dec. 31, 2021 segment
Accounting Policies [Abstract]
Number of operating segments	1
Number of reportable segments	1

Securities - Reconciliation from Amortized Cost to Estimated Fair Value (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Available-for-sale securities
Amortized Cost	$ 8,638,964	$ 898,751
Gross Unrealized Gains	44,809	44,022
Gross Unrealized Losses	(58,514)	(3,758)
Fair Value	8,625,259	939,015
U.S. agency securities - excluding mortgage-backed securities
Available-for-sale securities
Amortized Cost	1,177,452
Gross Unrealized Gains	7,320
Gross Unrealized Losses	(6,005)
Fair Value	1,178,767
Government agency mortgage-backed securities, Residential
Available-for-sale securities
Amortized Cost	1,428,365	5,701
Gross Unrealized Gains	130	18
Gross Unrealized Losses	(14,378)	(55)
Fair Value	1,414,117	5,664
Government agency collateralized mortgage obligation, Residential
Available-for-sale securities
Amortized Cost	1,659,125	197,978
Gross Unrealized Gains	1,617	371
Gross Unrealized Losses	(15,739)	(298)
Fair Value	1,645,003	198,051
Private-label collateralized mortgage obligation, Residential
Available-for-sale securities
Amortized Cost	1,425	20,544
Gross Unrealized Gains	19	399
Gross Unrealized Losses	(11)	(256)
Fair Value	1,433	20,687
Government agency mortgage-backed securities, Commercial
Available-for-sale securities
Amortized Cost	1,106,680
Gross Unrealized Gains	1,886
Gross Unrealized Losses	(4,962)
Fair Value	1,103,604
Government agency collateralized mortgage obligation, Commercial
Available-for-sale securities
Amortized Cost	212,266
Gross Unrealized Gains	19
Gross Unrealized Losses	(1,370)
Fair Value	210,915
Private-label collateralized mortgage obligation, Commercial
Available-for-sale securities
Amortized Cost	144,204	164,214
Gross Unrealized Gains	227	18,322
Gross Unrealized Losses	(797)	0
Fair Value	143,634	182,536
Tax-exempt
Available-for-sale securities
Amortized Cost	2,272,794	246,159
Gross Unrealized Gains	33,153	24,200
Gross Unrealized Losses	(8,210)	0
Fair Value	2,297,737	270,359
Taxable
Available-for-sale securities
Amortized Cost	403,279	15,307
Gross Unrealized Gains	341	695
Gross Unrealized Losses	(6,016)	0
Fair Value	397,604	16,002
Government sponsored student loan pools
Available-for-sale securities
Amortized Cost	233,374	248,848
Gross Unrealized Gains	97	17
Gross Unrealized Losses	(1,026)	(3,149)
Fair Value	$ 232,445	$ 245,716

Securities - Securities in Unrealized Loss Position (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Fair Value
Less than 12 Months	$ 5,887,738	$ 126,367
12 Months or More	40,727	307,751
Total	5,928,465	434,118
Unrealized Losses
Less than 12 Months	(58,132)	(234)
12 Months or More	(382)	(3,524)
Total	(58,514)	(3,758)
U.S. agency securities - excluding mortgage-backed securities
Fair Value
Less than 12 Months	761,711
12 Months or More	0
Total	761,711
Unrealized Losses
Less than 12 Months	(6,005)
12 Months or More	0
Total	(6,005)
Government agency mortgage-backed securities, Residential
Fair Value
Less than 12 Months	1,357,080	5,165
12 Months or More	70	0
Total	1,357,150	5,165
Unrealized Losses
Less than 12 Months	(14,378)	(55)
12 Months or More	0	0
Total	(14,378)	(55)
Government agency collateralized mortgage obligation, Residential
Fair Value
Less than 12 Months	1,513,388	120,912
12 Months or More	650	56,976
Total	1,514,038	177,888
Unrealized Losses
Less than 12 Months	(15,732)	(172)
12 Months or More	(7)	(126)
Total	(15,739)	(298)
Private-label collateralized mortgage obligation, Residential
Fair Value
Less than 12 Months	0	290
12 Months or More	433	9,950
Total	433	10,240
Unrealized Losses
Less than 12 Months	0	(7)
12 Months or More	(11)	(249)
Total	(11)	(256)
Government agency mortgage-backed securities, Commercial
Fair Value
Less than 12 Months	435,055
12 Months or More	0
Total	435,055
Unrealized Losses
Less than 12 Months	(4,962)
12 Months or More	0
Total	(4,962)
Government agency collateralized mortgage obligation, Commercial
Fair Value
Less than 12 Months	189,397
12 Months or More	0
Total	189,397
Unrealized Losses
Less than 12 Months	(1,370)
12 Months or More	0
Total	(1,370)
Private-label collateralized mortgage obligation, Commercial
Fair Value
Less than 12 Months	98,173
12 Months or More	6,791
Total	104,964
Unrealized Losses
Less than 12 Months	(656)
12 Months or More	(141)
Total	(797)
Tax-exempt
Fair Value
Less than 12 Months	1,025,689
12 Months or More	0
Total	1,025,689
Unrealized Losses
Less than 12 Months	(8,210)
12 Months or More	0
Total	(8,210)
Taxable
Fair Value
Less than 12 Months	339,041
12 Months or More	0
Total	339,041
Unrealized Losses
Less than 12 Months	(6,016)
12 Months or More	0
Total	(6,016)
Government sponsored student loan pools
Fair Value
Less than 12 Months	168,204	0
12 Months or More	32,783	240,825
Total	200,987	240,825
Unrealized Losses
Less than 12 Months	(803)	0
12 Months or More	(223)	(3,149)
Total	$ (1,026)	$ (3,149)

Securities - Narrative (Details)	12 Months Ended
Securities - Narrative (Details)	Dec. 31, 2021 USD ($) security	Dec. 31, 2020 USD ($) security
Investments, Debt and Equity Securities [Abstract]
Investment securities pledged for borrowings	$ 0	$ 0
Gross unrealized losses on securities in a continuous unrealized loss position	$ 58,514,000	$ 3,758,000
Number of securities whose estimated fair value declined \| security	323	30
Decline in fair value from amortized cost (as a percent)	0.98%	0.86%
Proceeds from sale of securities available-for-sale	$ 1,465,506,000	$ 216,355,000
Realized gain on available-for-sale securities	15,900,000	4,700,000
Realized loss on available-for-sale securities	10,600,000	900,000
Tax expense related to net realized gains and losses	1,500,000	1,300,000
Credit losses recognized in earnings	$ 0	$ 0

Securities - Amortized Cost and Estimated Fair Value of Investment Securities by Contractual Maturity (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Amortized Cost
Within one year	$ 0	$ 0
After one year through five years	2,243	0
After five years through ten years	1,406,395	14,021
After ten years	7,230,326	884,730
Total	8,638,964	898,751
Fair Value
Within one year	0	0
After one year through five years	2,170	0
After five years through ten years	1,401,733	15,694
After ten years	7,221,356	923,321
Total	$ 8,625,259	$ 939,015

Loans - Narrative (Details)	12 Months Ended
Loans - Narrative (Details)	Dec. 31, 2021 USD ($) contract	Dec. 31, 2020 USD ($) contract
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total gross loans held-for-investment	$ 893,945,000	$ 751,461,000
Accrued interest on loans held-for-investment	3,300,000	2,700,000
Investment in TDRs	1,700,000	1,500,000
Allowance allocated to investment in TDRs	29,000	$ 11,000
Loans modified as TDRs \| contract		0
Allowance for loan losses, increase by TDR's	$ 19,000
Loans modified as TDRs, subsequent default \| contract	0	0
Provision for loan loss for TDRs that subsequently defaulted	$ 0	$ 0
Related party loans	7,700,000	5,000,000
New loans advances	5,300,000	500,000
Decrease in balance of related party loans due to principal payments received	2,700,000	100,000
Real Estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total gross loans held-for-investment	381,000,000	574,500,000
SEN Leverage
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total gross loans held-for-investment	335,900,000	77,200,000
Mortgage warehouse \| Residential
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total gross loans held-for-investment	177,115,000	97,903,000
Gross mortgage warehouse loans	$ 1,100,000,000	$ 963,900,000

Loans - Summary of Loans (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total gross loans held-for-investment	$ 893,945	$ 751,461
Deferred fees, net	275	2,206
Total loans held-for-investment	894,220	753,667
Allowance for loan losses	(6,916)	(6,916)	$ (6,191)
Total loans held-for-investment, net	887,304	746,751
Total loans held-for-sale	893,194	865,961
Residential \| Mortgage warehouse
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total gross loans held-for-investment	177,115	97,903
Total loans held-for-investment	177,115	97,903
Allowance for loan losses	(840)	(423)	(250)
Reverse mortgage and other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total gross loans held-for-investment	1,410	1,495
Total loans held-for-investment	1,422	1,510
Allowance for loan losses	(12)	(39)	(38)
Real estate loans \| Residential \| One-to-four family
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total gross loans held-for-investment	105,098	187,855
Total loans held-for-investment	105,838	190,200
Allowance for loan losses	(1,023)	(1,245)	(2,051)
Real estate loans \| Residential \| Multi-family
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total gross loans held-for-investment	56,751	77,126
Total loans held-for-investment	56,855	77,288
Allowance for loan losses	(682)	(878)	(653)
Real estate loans \| Commercial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total gross loans held-for-investment	210,136	301,901
Total loans held-for-investment	210,126	302,080
Allowance for loan losses	(2,017)	(1,810)	(2,791)
Real estate loans \| Commercial \| Construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total gross loans held-for-investment	7,573	6,272
Total loans held-for-investment	7,502	6,137
Allowance for loan losses	(776)	(590)	(96)
Commercial and industrial \| Commercial and Industrial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total gross loans held-for-investment	335,862	78,909
Total loans held-for-investment	335,362	78,549
Allowance for loan losses	$ (1,566)	$ (1,931)	$ (312)

Loans - Allowance (Details) - USD ($) $ in Thousands	12 Months Ended
Loans - Allowance (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	$ 6,916	$ 6,191
Charge-offs	0	(17)
Recoveries	0	0
Provision for loan losses	0	742
Ending balance	6,916	6,916
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]
Specifically evaluated impaired loans	29	40
General portfolio allocation	6,887	6,876
Total allowance for loan losses	6,916	6,916
Specifically evaluated	7,108	16,661
Collectively evaluated	887,112	737,006
Total loans held-for-investment	894,220	753,667
Residential \| One-to-four family \| Real estate loans
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	1,245	2,051
Charge-offs	0	(17)
Recoveries	0	0
Provision for loan losses	(222)	(789)
Ending balance	1,023	1,245
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]
Specifically evaluated impaired loans	29	11
General portfolio allocation	994	1,234
Total allowance for loan losses	1,023	1,245
Specifically evaluated	4,229	5,795
Collectively evaluated	101,609	184,405
Total loans held-for-investment	105,838	190,200
Residential \| Multi-family \| Real estate loans
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	878	653
Charge-offs	0	0
Recoveries	0	0
Provision for loan losses	(196)	225
Ending balance	682	878
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]
Specifically evaluated impaired loans	0	0
General portfolio allocation	682	878
Total allowance for loan losses	682	878
Specifically evaluated	0	0
Collectively evaluated	56,855	77,288
Total loans held-for-investment	56,855	77,288
Residential \| Mortgage Warehouse
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	423	250
Charge-offs	0	0
Recoveries	0	0
Provision for loan losses	417	173
Ending balance	840	423
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]
Specifically evaluated impaired loans	0	0
General portfolio allocation	840	423
Total allowance for loan losses	840	423
Specifically evaluated	0	0
Collectively evaluated	177,115	97,903
Total loans held-for-investment	177,115	97,903
Commercial \| Real estate loans
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	1,810	2,791
Charge-offs	0	0
Recoveries	0	0
Provision for loan losses	207	(981)
Ending balance	2,017	1,810
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]
Specifically evaluated impaired loans	0	0
General portfolio allocation	2,017	1,810
Total allowance for loan losses	2,017	1,810
Specifically evaluated	1,956	9,713
Collectively evaluated	208,170	292,367
Total loans held-for-investment	210,126	302,080
Commercial \| Construction \| Real estate loans
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	590	96
Charge-offs	0	0
Recoveries	0	0
Provision for loan losses	186	494
Ending balance	776	590
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]
Specifically evaluated impaired loans	0	0
General portfolio allocation	776	590
Total allowance for loan losses	776	590
Specifically evaluated	0	0
Collectively evaluated	7,502	6,137
Total loans held-for-investment	7,502	6,137
Commercial and Industrial \| Commercial and industrial
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	1,931	312
Charge-offs	0	0
Recoveries	0	0
Provision for loan losses	(365)	1,619
Ending balance	1,566	1,931
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]
Specifically evaluated impaired loans	0	0
General portfolio allocation	1,566	1,931
Total allowance for loan losses	1,566	1,931
Specifically evaluated	0	274
Collectively evaluated	335,362	78,275
Total loans held-for-investment	335,362	78,549
Reverse Mortgage and Other
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	39	38
Charge-offs	0	0
Recoveries	0	0
Provision for loan losses	(27)	1
Ending balance	12	39
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]
Specifically evaluated impaired loans	0	29
General portfolio allocation	12	10
Total allowance for loan losses	12	39
Specifically evaluated	923	879
Collectively evaluated	499	631
Total loans held-for-investment	$ 1,422	$ 1,510

Loans - Impaired Loans (Details) - USD ($) $ in Thousands	12 Months Ended
Loans - Impaired Loans (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Financing Receivable, Impaired [Line Items]
Impaired loans with no related allowance - Unpaid Principal Balance	$ 7,485	$ 16,952
Impaired loans with no related allowance - Recorded Investment	6,806	16,248
Impaired loans with related allowance - Unpaid Principal Balance	323	410
Impaired loans with related allowance - Recorded Investment	302	413
Impaired loans - Unpaid Principal Balance	7,808	17,362
Impaired loans - Recorded Investment	7,108	16,661
Impaired loans - Related Allowance	29	40
Impaired loans with no related allowance - Average Recorded Investment	14,632	10,564
Impaired loans with no related allowance - Interest Income Recognized	795	762
Impaired loans with related allowance - Average Recorded Investment	323	407
Impaired loans with related allowance - Interest Income Recognized	12	5
Impaired loans - Average Recorded Investment	14,955	10,971
Impaired loans - Interest Income Recognized	807	767
Reverse mortgage and other
Financing Receivable, Impaired [Line Items]
Impaired loans with no related allowance - Unpaid Principal Balance	914	523
Impaired loans with no related allowance - Recorded Investment	923	531
Impaired loans with related allowance - Unpaid Principal Balance	0	346
Impaired loans with related allowance - Recorded Investment	0	348
Impaired loans - Related Allowance	0	29
Impaired loans with no related allowance - Average Recorded Investment	825	516
Impaired loans with no related allowance - Interest Income Recognized	0	0
Impaired loans with related allowance - Average Recorded Investment	65	342
Impaired loans with related allowance - Interest Income Recognized	0	0
Real estate loans \| Residential \| One-to-four family
Financing Receivable, Impaired [Line Items]
Impaired loans with no related allowance - Unpaid Principal Balance	4,616	6,432
Impaired loans with no related allowance - Recorded Investment	3,927	5,730
Impaired loans with related allowance - Unpaid Principal Balance	323	64
Impaired loans with related allowance - Recorded Investment	302	65
Impaired loans - Related Allowance	29	11
Impaired loans with no related allowance - Average Recorded Investment	5,719	3,748
Impaired loans with no related allowance - Interest Income Recognized	303	215
Impaired loans with related allowance - Average Recorded Investment	258	65
Impaired loans with related allowance - Interest Income Recognized	12	5
Real estate loans \| Commercial
Financing Receivable, Impaired [Line Items]
Impaired loans with no related allowance - Unpaid Principal Balance	1,955	9,723
Impaired loans with no related allowance - Recorded Investment	1,956	9,713
Impaired loans with no related allowance - Average Recorded Investment	7,906	4,620
Impaired loans with no related allowance - Interest Income Recognized	477	522
Commercial and industrial \| Commercial and Industrial
Financing Receivable, Impaired [Line Items]
Impaired loans with no related allowance - Unpaid Principal Balance	0	274
Impaired loans with no related allowance - Recorded Investment	0	274
Impaired loans with no related allowance - Average Recorded Investment	182	1,680
Impaired loans with no related allowance - Interest Income Recognized	$ 15	$ 25

Loans - Aging Analysis (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Financing Receivable, Past Due [Line Items]
Total	$ 894,220	$ 753,667
Nonaccruing	4,003	4,984
Loans Receivable > 89 Days and Accruing	0	0
30-59 Days Past Due
Financing Receivable, Past Due [Line Items]
Total	1,176	1,212
60-89 Days Past Due
Financing Receivable, Past Due [Line Items]
Total	0	26
Greater than 89 Days Past Due
Financing Receivable, Past Due [Line Items]
Total	2,985	3,866
Total Past Due
Financing Receivable, Past Due [Line Items]
Total	4,161	5,104
Current
Financing Receivable, Past Due [Line Items]
Total	890,059	748,563
Residential \| Mortgage warehouse
Financing Receivable, Past Due [Line Items]
Total	177,115	97,903
Nonaccruing	0	0
Loans Receivable > 89 Days and Accruing	0	0
Residential \| Mortgage warehouse \| 30-59 Days Past Due
Financing Receivable, Past Due [Line Items]
Total	0	0
Residential \| Mortgage warehouse \| 60-89 Days Past Due
Financing Receivable, Past Due [Line Items]
Total	0	0
Residential \| Mortgage warehouse \| Greater than 89 Days Past Due
Financing Receivable, Past Due [Line Items]
Total	0	0
Residential \| Mortgage warehouse \| Total Past Due
Financing Receivable, Past Due [Line Items]
Total	0	0
Residential \| Mortgage warehouse \| Current
Financing Receivable, Past Due [Line Items]
Total	177,115	97,903
Reverse mortgage and other
Financing Receivable, Past Due [Line Items]
Total	1,422	1,510
Nonaccruing	923	879
Loans Receivable > 89 Days and Accruing	0	0
Reverse mortgage and other \| 30-59 Days Past Due
Financing Receivable, Past Due [Line Items]
Total	0	0
Reverse mortgage and other \| 60-89 Days Past Due
Financing Receivable, Past Due [Line Items]
Total	0	0
Reverse mortgage and other \| Greater than 89 Days Past Due
Financing Receivable, Past Due [Line Items]
Total	0	0
Reverse mortgage and other \| Total Past Due
Financing Receivable, Past Due [Line Items]
Total	0	0
Reverse mortgage and other \| Current
Financing Receivable, Past Due [Line Items]
Total	1,422	1,510
Real estate loans \| Residential \| One-to-four family
Financing Receivable, Past Due [Line Items]
Total	105,838	190,200
Nonaccruing	3,080	4,105
Loans Receivable > 89 Days and Accruing	0	0
Real estate loans \| Residential \| One-to-four family \| 30-59 Days Past Due
Financing Receivable, Past Due [Line Items]
Total	1,176	1,006
Real estate loans \| Residential \| One-to-four family \| 60-89 Days Past Due
Financing Receivable, Past Due [Line Items]
Total	0	26
Real estate loans \| Residential \| One-to-four family \| Greater than 89 Days Past Due
Financing Receivable, Past Due [Line Items]
Total	2,985	3,866
Real estate loans \| Residential \| One-to-four family \| Total Past Due
Financing Receivable, Past Due [Line Items]
Total	4,161	4,898
Real estate loans \| Residential \| One-to-four family \| Current
Financing Receivable, Past Due [Line Items]
Total	101,677	185,302
Real estate loans \| Residential \| Multi-family
Financing Receivable, Past Due [Line Items]
Total	56,855	77,288
Nonaccruing	0	0
Loans Receivable > 89 Days and Accruing	0	0
Real estate loans \| Residential \| Multi-family \| 30-59 Days Past Due
Financing Receivable, Past Due [Line Items]
Total	0	206
Real estate loans \| Residential \| Multi-family \| 60-89 Days Past Due
Financing Receivable, Past Due [Line Items]
Total	0	0
Real estate loans \| Residential \| Multi-family \| Greater than 89 Days Past Due
Financing Receivable, Past Due [Line Items]
Total	0	0
Real estate loans \| Residential \| Multi-family \| Total Past Due
Financing Receivable, Past Due [Line Items]
Total	0	206
Real estate loans \| Residential \| Multi-family \| Current
Financing Receivable, Past Due [Line Items]
Total	56,855	77,082
Real estate loans \| Commercial
Financing Receivable, Past Due [Line Items]
Total	210,126	302,080
Nonaccruing	0	0
Loans Receivable > 89 Days and Accruing	0	0
Real estate loans \| Commercial \| 30-59 Days Past Due
Financing Receivable, Past Due [Line Items]
Total	0	0
Real estate loans \| Commercial \| 60-89 Days Past Due
Financing Receivable, Past Due [Line Items]
Total	0	0
Real estate loans \| Commercial \| Greater than 89 Days Past Due
Financing Receivable, Past Due [Line Items]
Total	0	0
Real estate loans \| Commercial \| Total Past Due
Financing Receivable, Past Due [Line Items]
Total	0	0
Real estate loans \| Commercial \| Current
Financing Receivable, Past Due [Line Items]
Total	210,126	302,080
Real estate loans \| Commercial \| Construction
Financing Receivable, Past Due [Line Items]
Total	7,502	6,137
Nonaccruing	0	0
Loans Receivable > 89 Days and Accruing	0	0
Real estate loans \| Commercial \| Construction \| 30-59 Days Past Due
Financing Receivable, Past Due [Line Items]
Total	0	0
Real estate loans \| Commercial \| Construction \| 60-89 Days Past Due
Financing Receivable, Past Due [Line Items]
Total	0	0
Real estate loans \| Commercial \| Construction \| Greater than 89 Days Past Due
Financing Receivable, Past Due [Line Items]
Total	0	0
Real estate loans \| Commercial \| Construction \| Total Past Due
Financing Receivable, Past Due [Line Items]
Total	0	0
Real estate loans \| Commercial \| Construction \| Current
Financing Receivable, Past Due [Line Items]
Total	7,502	6,137
Commercial and industrial \| Commercial and Industrial
Financing Receivable, Past Due [Line Items]
Total	335,362	78,549
Nonaccruing	0	0
Loans Receivable > 89 Days and Accruing	0	0
Commercial and industrial \| Commercial and Industrial \| 30-59 Days Past Due
Financing Receivable, Past Due [Line Items]
Total	0	0
Commercial and industrial \| Commercial and Industrial \| 60-89 Days Past Due
Financing Receivable, Past Due [Line Items]
Total	0	0
Commercial and industrial \| Commercial and Industrial \| Greater than 89 Days Past Due
Financing Receivable, Past Due [Line Items]
Total	0	0
Commercial and industrial \| Commercial and Industrial \| Total Past Due
Financing Receivable, Past Due [Line Items]
Total	0	0
Commercial and industrial \| Commercial and Industrial \| Current
Financing Receivable, Past Due [Line Items]
Total	$ 335,362	$ 78,549

Loans - Modifications Loans Classified as TDRs (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2021 USD ($) contract	Dec. 31, 2020 contract
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Loans \| contract		0
Real estate loans \| Residential \| One-to-four family
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Loans \| contract	2
Pre- Modifications Outstanding Recorded Investment \| $	$ 547
Post- Modifications Outstanding Recorded Investment \| $	$ 590

Loans - Credit Quality Indicators (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Financing Receivable, Credit Quality Indicator [Line Items]
Total	$ 894,220	$ 753,667
Pass
Financing Receivable, Credit Quality Indicator [Line Items]
Total	879,238	731,465
Special Mention
Financing Receivable, Credit Quality Indicator [Line Items]
Total	10,979	9,189
Substandard
Financing Receivable, Credit Quality Indicator [Line Items]
Total	4,003	13,013
Doubtful
Financing Receivable, Credit Quality Indicator [Line Items]
Total	0	0
Residential \| Mortgage warehouse
Financing Receivable, Credit Quality Indicator [Line Items]
Total	177,115	97,903
Residential \| Mortgage warehouse \| Pass
Financing Receivable, Credit Quality Indicator [Line Items]
Total	177,115	97,903
Residential \| Mortgage warehouse \| Special Mention
Financing Receivable, Credit Quality Indicator [Line Items]
Total	0	0
Residential \| Mortgage warehouse \| Substandard
Financing Receivable, Credit Quality Indicator [Line Items]
Total	0	0
Residential \| Mortgage warehouse \| Doubtful
Financing Receivable, Credit Quality Indicator [Line Items]
Total	0	0
Reverse mortgage and other
Financing Receivable, Credit Quality Indicator [Line Items]
Total	1,422	1,510
Reverse mortgage and other \| Pass
Financing Receivable, Credit Quality Indicator [Line Items]
Total	499	631
Reverse mortgage and other \| Special Mention
Financing Receivable, Credit Quality Indicator [Line Items]
Total	0	0
Reverse mortgage and other \| Substandard
Financing Receivable, Credit Quality Indicator [Line Items]
Total	923	879
Reverse mortgage and other \| Doubtful
Financing Receivable, Credit Quality Indicator [Line Items]
Total	0	0
Real estate loans \| Residential \| One-to-four family
Financing Receivable, Credit Quality Indicator [Line Items]
Total	105,838	190,200
Real estate loans \| Residential \| One-to-four family \| Pass
Financing Receivable, Credit Quality Indicator [Line Items]
Total	102,307	182,760
Real estate loans \| Residential \| One-to-four family \| Special Mention
Financing Receivable, Credit Quality Indicator [Line Items]
Total	451	3,335
Real estate loans \| Residential \| One-to-four family \| Substandard
Financing Receivable, Credit Quality Indicator [Line Items]
Total	3,080	4,105
Real estate loans \| Residential \| One-to-four family \| Doubtful
Financing Receivable, Credit Quality Indicator [Line Items]
Total	0	0
Real estate loans \| Residential \| Multi-family
Financing Receivable, Credit Quality Indicator [Line Items]
Total	56,855	77,288
Real estate loans \| Residential \| Multi-family \| Pass
Financing Receivable, Credit Quality Indicator [Line Items]
Total	56,855	77,288
Real estate loans \| Residential \| Multi-family \| Special Mention
Financing Receivable, Credit Quality Indicator [Line Items]
Total	0	0
Real estate loans \| Residential \| Multi-family \| Substandard
Financing Receivable, Credit Quality Indicator [Line Items]
Total	0	0
Real estate loans \| Residential \| Multi-family \| Doubtful
Financing Receivable, Credit Quality Indicator [Line Items]
Total	0	0
Real estate loans \| Commercial
Financing Receivable, Credit Quality Indicator [Line Items]
Total	210,126	302,080
Real estate loans \| Commercial \| Pass
Financing Receivable, Credit Quality Indicator [Line Items]
Total	199,598	288,471
Real estate loans \| Commercial \| Special Mention
Financing Receivable, Credit Quality Indicator [Line Items]
Total	10,528	5,854
Real estate loans \| Commercial \| Substandard
Financing Receivable, Credit Quality Indicator [Line Items]
Total	0	7,755
Real estate loans \| Commercial \| Doubtful
Financing Receivable, Credit Quality Indicator [Line Items]
Total	0	0
Real estate loans \| Commercial \| Construction
Financing Receivable, Credit Quality Indicator [Line Items]
Total	7,502	6,137
Real estate loans \| Commercial \| Construction \| Pass
Financing Receivable, Credit Quality Indicator [Line Items]
Total	7,502	6,137
Real estate loans \| Commercial \| Construction \| Special Mention
Financing Receivable, Credit Quality Indicator [Line Items]
Total	0	0
Real estate loans \| Commercial \| Construction \| Substandard
Financing Receivable, Credit Quality Indicator [Line Items]
Total	0	0
Real estate loans \| Commercial \| Construction \| Doubtful
Financing Receivable, Credit Quality Indicator [Line Items]
Total	0	0
Commercial and industrial \| Commercial and industrial
Financing Receivable, Credit Quality Indicator [Line Items]
Total	335,362	78,549
Commercial and industrial \| Commercial and industrial \| Pass
Financing Receivable, Credit Quality Indicator [Line Items]
Total	335,362	78,275
Commercial and industrial \| Commercial and industrial \| Special Mention
Financing Receivable, Credit Quality Indicator [Line Items]
Total	0	0
Commercial and industrial \| Commercial and industrial \| Substandard
Financing Receivable, Credit Quality Indicator [Line Items]
Total	0	274
Commercial and industrial \| Commercial and industrial \| Doubtful
Financing Receivable, Credit Quality Indicator [Line Items]
Total	$ 0	$ 0

Loans - Purchased and Sold (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Accounts, Notes, Loans and Financing Receivable [Line Items]
Purchases	$ 1,040	$ 89,873
Sales	0	0
Real estate loans \| Residential \| One-to-four family
Accounts, Notes, Loans and Financing Receivable [Line Items]
Purchases	0	89,873
Sales	0	0
Real estate loans \| Residential \| Multi-family
Accounts, Notes, Loans and Financing Receivable [Line Items]
Purchases	1,040	0
Sales	$ 0	$ 0

Premises and Equipment, Net - Summary (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Property, Plant and Equipment [Line Items]
Premises and equipment, gross	$ 9,658	$ 7,753
Accumulated depreciation and amortization	(6,650)	(5,681)
Total premises and equipment, net	3,008	2,072
Equipment, furniture, and software
Property, Plant and Equipment [Line Items]
Premises and equipment, gross	8,286	6,381
Leasehold improvements
Property, Plant and Equipment [Line Items]
Premises and equipment, gross	$ 1,372	$ 1,372

Premises and Equipment, Net - Narrative (Details) - USD ($)	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Property, Plant and Equipment [Abstract]
Depreciation expense	$ 1,000,000	$ 2,100,000
Depreciation expense related to disposal of furniture, equipment, and leasehold improvements no longer in use		900,000
Leases not yet commenced	0	0
Cash paid for amounts included in the measurement of operating lease liabilities	$ 1,800,000	$ 1,700,000
Minimum
Property, Plant and Equipment [Line Items]
Operating leases, original lease terms	12 months
Maximum
Property, Plant and Equipment [Line Items]
Operating leases, original lease terms	84 months

Premises and Equipment, Net - Supplemental Balance Sheet Information (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Property, Plant and Equipment [Abstract]
Right-of-use assets	$ 4,457	$ 1,799
Lease liabilities	$ 5,233	$ 3,376
Operating Lease, Right-of-Use Asset, Statement of Financial Position [Extensible List]	Other assets	Other assets
Operating Lease, Liability, Statement of Financial Position [Extensible List]	Accrued expenses and other liabilities	Accrued expenses and other liabilities

Premises and Equipment, Net - Weighted Average Lease Term and Discount Rate (Details)	Dec. 31, 2021	Dec. 31, 2020
Property, Plant and Equipment [Abstract]
Weighted-average remaining lease term	4 years 8 months 12 days	2 years
Weighted-average discount rate (as a percent)	4.70%	4.21%

Premises and Equipment, Net - Lease Expense (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Property, Plant and Equipment [Abstract]
Operating lease costs	$ 973	$ 2,943
Short-term lease costs	40	102
Variable lease costs	39	77
Less: Sublease income	(201)	(155)
Total lease costs	$ 851	2,967
Impairment charge related to leased office space		$ 1,400

Premises and Equipment, Net - Maturities of Lease Liabilities (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Property, Plant and Equipment [Abstract]
2022	$ 1,513
2023	991
2024	815
2025	820
2026	857
Thereafter	741
Total lease payments	5,737
Less: imputed lease interest	(504)
Total lease liabilities	$ 5,233	$ 3,376

Deposits - Composition (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Deposits [Abstract]
Noninterest bearing demand accounts	$ 14,213,472	$ 5,133,579
Interest bearing accounts:
Interest bearing demand accounts	7,455	42,143
Money market and savings accounts	69,161	71,460
Certificates of deposit	540	844
Interest bearing accounts	77,156	114,447
Total deposits	$ 14,290,628	$ 5,248,026

Deposits - Maturities (Details) $ in Thousands	Dec. 31, 2021 USD ($)
Time Deposits, Fiscal Year Maturity [Abstract]
2022	$ 448
2023	39
2024	53
Thereafter	0
Total	$ 540

Deposits - Narrative (Details)	Dec. 31, 2021 USD ($) exchange	Dec. 31, 2020 USD ($) exchange
Deposits [Abstract]
Certificates of deposits at or above FDIC insurance limit	$ 0	$ 0
Deposits from officers, directors, and affiliates	500,000	1,200,000
Deposits of 10 largest depositors	$ 6,500,000,000	$ 2,500,000,000
Proportion of total deposits of 10 largest depositors (as a percent)	45.30%	47.50%
Proportion of deposits from digital currency exchanges (as a percent)	58.00%	47.20%
Number of digital currency exchanges with deposits \| exchange	94	76

FHLB Advances and Other Borrowings - Narrative (Details)	Dec. 31, 2021 USD ($) bank	Dec. 31, 2020 USD ($)
Short-term Debt [Line Items]
FHLB advances, leverage ratio, maximum	35.00%	35.00%
FHLB advances, collateral pledged	$ 1,400,000,000	$ 1,500,000,000
FHLB advances, unused borrowing capacity	973,900,000	893,000,000
FHLB advances, amount outstanding	0	0
Federal funds purchased, maximum borrowing capacity	$ 108,000,000
Number of correspondent banks \| bank	2
Federal funds purchased, amount outstanding	$ 0	0
Federal Reserve Bank Advances
Short-term Debt [Line Items]
FRB advances, collateral pledged	6,000,000	6,300,000
FRB advances, current borrowing capacity	5,200,000
FRB advances, amount outstanding	$ 0	$ 0

Subordinated Debentures, Net (Details) - Subordinated Debentures - USD ($)	1 Months Ended		12 Months Ended
	Jan. 31, 2005	Jul. 31, 2001	Dec. 31, 2021	Dec. 31, 2020
Debt Instrument [Line Items]
Interest payments, deferment period			5 years
Outstanding principal balance			$ 15,800,000	$ 15,800,000
Unamortized debt issuance costs			$ 100,000	$ 100,000
Trust Two \| Trust Two
Debt Instrument [Line Items]
Minority interest (as a percent)			3.00%
2001 Subordinated Debentures Maturing July 25, 2031 \| Trust One
Debt Instrument [Line Items]
Principal amount		$ 12,500,000
Effective interest rate (as a percent)			3.91%
Redemption price (as a percent)			100.00%
2001 Subordinated Debentures Maturing July 25, 2031 \| Trust One \| London Interbank Offered Rate (LIBOR)
Debt Instrument [Line Items]
Basis spread on variable rate (as a percent)		3.75%
Interest rate (as a percent)			0.16%
2005 Subordinated Debentures Maturing March 15, 2035 \| Trust Two
Debt Instrument [Line Items]
Principal amount	$ 3,000,000
Redemption price (as a percent)			100.00%
2005 Subordinated Debentures Maturing March 15, 2035 \| Trust Two \| London Interbank Offered Rate (LIBOR)
Debt Instrument [Line Items]
Basis spread on variable rate (as a percent)	1.85%
Effective interest rate (as a percent)			2.05%
Interest rate (as a percent)			0.20%

Derivative and Hedging Activities - Narrative (Details) $ in Millions	1 Months Ended	3 Months Ended	12 Months Ended
	Oct. 31, 2021 USD ($)	Mar. 31, 2020 USD ($)	Dec. 31, 2021 USD ($) instrument	Dec. 31, 2019 USD ($) instrument	Dec. 31, 2012 USD ($)	Dec. 31, 2020 USD ($) instrument
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Estimated net derivative gain included in OCI to be reclassified into earnings			$ 4.1
Estimated time for net derivative gain included in OCI to be reclassified into earnings			12 months
Interest Rate Swap
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Number of derivative instruments \| instrument						2
Derivative, notional amount						$ 14.3
Gain on sale of derivatives	$ 0.9
Interest Rate Floor
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Number of derivative instruments \| instrument				20
Derivative, notional amount				$ 400.0
Gain on sale of derivatives		$ 8.4
Upfront fee paid to counterparty				$ 20.8
Derivative, notional amount sold		200.0
Proceeds from sale of derivative		$ 13.0
Recognition period for net gain on sale of derivative		4 years 1 month 6 days
Interest Rate Floor \| Fed Funds Rate
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Floor interest rate (as a percent)			2.50%
Interest Rate Floor \| London Interbank Offered Rate (LIBOR)
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Floor interest rate (as a percent)			2.25%
Interest Rate Cap
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Number of derivative instruments \| instrument			26
Derivative, notional amount			$ 552.8
Upfront fee paid to counterparty			$ 24.7		$ 2.5
Interest Rate Cap \| Cap Agreement Expiring July 25, 2022
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Derivative, notional amount					12.5
Interest Rate Cap \| Cap Agreement Expiring March 15, 2022
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Derivative, notional amount					$ 3.0
Interest Rate Cap \| Fed Funds Rate
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Floor interest rate (as a percent)			2.00%
Interest Rate Cap \| London Interbank Offered Rate (LIBOR) \| Cap Agreement Expiring July 25, 2022
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Cap interest rate (as a percent)					0.75%
Interest Rate Cap \| London Interbank Offered Rate (LIBOR) \| Cap Agreement Expiring March 15, 2022
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Cap interest rate (as a percent)					0.50%

Derivative and Hedging Activities - Fair Value by Balance Sheet Location (Details) - Derivative assets - Derivatives designated as hedging instruments - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Interest Rate Floor \| Cash Flow Hedging
Derivatives, Fair Value [Line Items]
Derivative assets	$ 18,992	$ 30,766
Interest Rate Cap \| Cash Flow Hedging
Derivatives, Fair Value [Line Items]
Derivative assets	0	0
Interest Rate Cap \| Fair Value Hedging
Derivatives, Fair Value [Line Items]
Derivative assets	15,064	0
Interest Rate Swap \| Fair Value Hedging
Derivatives, Fair Value [Line Items]
Derivative assets	$ 0	$ 338

Derivative and Hedging Activities - Cumulative Amount of Fair Value Hedging Adjustments (Details) - Securities available-for-sale - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Carrying Amount of the Hedged Asset (Liability)	$ 697,437	$ 15,367
Cumulative Amount of Fair Value Hedging Adjustments Included in the Carrying Amount of Hedged Assets/(Liabilities)	$ 0	$ (278)

Derivative and Hedging Activities - Amount of Gain (Loss) Recognized in OCI and Reclassified into Income (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Amount of Gain (Loss) Recognized in OCI	$ (17,780)	$ 22,186
Interest income - Other interest earning assets	6,799	1,639
Interest expense - Subordinated debentures	(993)	(1,083)
Derivatives designated as hedging instruments \| Reclassification out of Accumulated Other Comprehensive Income
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Interest income - Other interest earning assets	560	745
Interest income - Taxable securities	4,303	2,910
Interest expense - Subordinated debentures	(402)	(309)
Derivatives designated as hedging instruments \| Cash flow hedge interest rate floor
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Amount of Gain (Loss) Recognized in OCI	(1,483)	6,167
Derivatives designated as hedging instruments \| Cash flow hedge interest rate floor
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Amount of Gain (Loss) Recognized in OCI	(5,931)	17,949
Derivatives designated as hedging instruments \| Cash flow hedge interest rate cap
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Amount of Gain (Loss) Recognized in OCI	0	(297)
Derivatives designated as hedging instruments \| Cash flow hedge interest rate cap \| Fair Value Hedging
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Amount of Gain (Loss) Recognized in OCI	$ (7,951)	$ 0

Derivative and Hedging Activities - Effect of Fair Value Hedge Accounting (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Interest income - Taxable securities	$ 36,094	$ 17,465
Interest income - Tax-exempt securities	17,301	5,062
Interest Rate Cap \| Fair Value Hedging
Interest rate contracts:
Amount excluded from effectiveness testing recognized in earnings based on amortization approach	(1,729)	0
Interest Rate Cap \| Fair Value Hedging \| Interest income - Taxable securities
Interest rate contracts:
Hedged items	(626)	(390)
Interest Rate Cap \| Fair Value Hedging \| Interest income - Tax-exempt securities
Interest rate contracts:
Hedged items	0	0
Derivatives designated as hedging instruments \| Interest Rate Cap \| Fair Value Hedging \| Interest income - Taxable securities
Interest rate contracts:
Derivatives designated as hedging instruments	515	355
Derivatives designated as hedging instruments \| Interest Rate Cap \| Fair Value Hedging \| Interest income - Tax-exempt securities
Interest rate contracts:
Derivatives designated as hedging instruments	$ 0	$ 0

Income Taxes - Expense (Details) - USD ($) $ in Thousands	12 Months Ended
Income Taxes - Expense (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Current provision
Federal	$ 3,556	$ 3,441
State	4,391	2,121
Current provision	7,947	5,562
Federal deferred tax benefit	(614)	(286)
State deferred tax benefit	(458)	(120)
Deferred tax (benefit) expense	(1,072)	(406)
Income tax expense	$ 6,875	$ 5,156

- Definition

Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

+ References + Details

Income Taxes - Effective Income Tax Rate Reconciliation (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Amount
Statutory federal tax	$ 17,935	$ 6,551
State tax, net of federal benefit	3,208	1,687
Tax credits	(409)	(290)
Tax-exempt income, net	(3,998)	(1,063)
Excess tax benefit from stock-based compensation	(9,846)	(1,681)
Other items, net	(15)	(48)
Income tax expense	$ 6,875	$ 5,156
Rate
Statutory federal tax (as a percent)	21.00%	21.00%
State tax, net of federal benefit (as a percent)	3.80%	5.40%
Tax credits (as a percent)	(0.50%)	(0.90%)
Tax exempt income, net (as a percent)	(4.70%)	(3.40%)
Excess tax benefit from stock-based compensation (as a percent)	(11.50%)	(5.40%)
Other items, net (as a percent)	0.00%	(0.20%)
Actual tax expense (benefit) (as a percent)	8.10%	16.50%

Income Taxes - Narrative (Details) - USD ($) $ in Thousands	12 Months Ended
Income Taxes - Narrative (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Income Tax Disclosure [Abstract]
Income tax expense	$ 6,875	$ 5,156
Effective tax rate (as a percent)	8.10%	16.50%

- Definition

Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

+ References + Details

Income Taxes - Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Deferred tax assets
Allowance for loan losses	$ 2,027	$ 1,941
Securities available-for-sale	4,016	0
Accrued vacation pay	633	448
Accrued bonus	402	301
State taxes	660	423
Operating lease liabilities	1,534	948
Other	987	279
Deferred tax assets	10,259	4,340
Deferred tax liabilities
Basis difference in fixed assets	(546)	(271)
Securities available-for-sale	0	(11,301)
Derivatives	(1,147)	(6,665)
Operating lease right-of-use assets	(1,307)	(505)
Other	(766)	(1,012)
Deferred tax liabilities	(3,766)	(19,754)
Deferred tax asset (liability), net	$ 6,493
Deferred tax asset (liability), net		$ (15,414)

Commitments and Contingencies - Off-Balance Sheet Items (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Debt Instrument [Line Items]
Allowance for commitments	$ 600	$ 100
Total credit extension commitments	248,576	49,620
Unfunded lines of credit
Debt Instrument [Line Items]
Total credit extension commitments	248,092	49,487
Letters of credit
Debt Instrument [Line Items]
Total credit extension commitments	$ 484	$ 133

Stock-based Compensation - Narrative (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Jun. 30, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense	$ 1.9	$ 0.9
Stock based compensation expense, tax benefit	13.6	2.2
Intrinsic value of options exercised	43.0	7.8
Tax benefit from option exercises	12.5	2.1
Unrecognized stock-based compensation expense related to stock options	$ 1.0
Period unrecognized expenses is expected to be recognized	2 years 1 month 6 days
2018 Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares authorized (shares)			1,596,753
Stock Options \| 2018 and 2010 Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Terms of award	10 years
Forfeiture period after service termination	60 days
Stock option issuance exercise price, proportion of fair value (as a percent)	100.00%
Restricted Stock Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Period unrecognized expenses is expected to be recognized	2 years 1 month 6 days
Unrecognized stock-based compensation expense	$ 2.6
Fair value of awards vested during the period	$ 0.4	$ 0.5
Minimum \| Stock Options \| 2018 and 2010 Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period	3 years
Minimum \| Restricted Stock Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period	1 year
Maximum \| Stock Options \| 2018 and 2010 Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period	4 years
Maximum \| Restricted Stock Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period	4 years

Stock-based Compensation - Assumptions (Details) - $ / shares	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Weighted-average grant date fair value (USD per share)	$ 52.78	$ 4.93
Stock Options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Risk-free interest rate (as a percent)	0.95%	1.45%
Expected term	6 years	6 years 2 months 12 days
Expected stock price volatility (as a percent)	42.44%	30.88%
Dividend yield (as a percent)	0.00%	0.00%

Stock-based Compensation - Stock Compensation Plans (Details) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2021 USD ($) $ / shares shares
Number of Options
Outstanding at beginning of period (shares) \| shares	595,303
Granted (shares) \| shares	18,585
Exercised (shares) \| shares	(414,602)
Forfeited or expired (shares) \| shares	(8,095)
Outstanding at end of period (shares) \| shares	191,191
Exercisable at end of period (shares) \| shares	94,434
Vested or Expected to Vest at end of period (shares) \| shares	182,372
Weighted Average Exercise Price
Outstanding at beginning of period (USD per share) \| $ / shares	$ 8.01
Granted (USD per share) \| $ / shares	127.56
Exercised (USD per share) \| $ / shares	5.39
Forfeited or expired (USD per share) \| $ / shares	16.09
Outstanding at end of period (USD per share) \| $ / shares	24.97
Exercisable at end of period (USD per share) \| $ / shares	12.16
Vested or Expected to Vest at end of period (USD per share) \| $ / shares	$ 24.73
Weighted Average Remaining Contractual Life (in years)
Outstanding at end of period	7 years 1 month 6 days
Exercisable at end of period	6 years 1 month 6 days
Vested or Expected to Vest at end of period	7 years 1 month 6 days
Aggregate Intrinsic Value (in thousands)
Outstanding at end of period \| $	$ 23,561
Exercisable at end of period \| $	12,847
Vested or Expected to Vest at end of period \| $	$ 22,518

Stock-based Compensation - Restricted Stock Units Activity (Details) - Restricted Stock Units	12 Months Ended
	Dec. 31, 2021 $ / shares shares
Number of Shares
Balance at beginning of period (shares) \| shares	58,690
Granted (shares) \| shares	31,788
Vested (shares) \| shares	(29,499)
Forfeited (shares) \| shares	(4,108)
Balance at end of period (shares) \| shares	56,871
Weighted-Average Grant Date Fair Value Per Share
Balance at beginning of period (USD per share) \| $ / shares	$ 15.61
Granted (USD per share) \| $ / shares	121.61
Vested (USD per share) \| $ / shares	15.17
Forfeited (USD per share) \| $ / shares	50.91
Balance at end of period (USD per share) \| $ / shares	$ 72.53

Employee Benefit Plan (Details) - USD ($) $ in Millions	12 Months Ended
Employee Benefit Plan (Details) - USD ($) $ in Millions	Dec. 31, 2021	Dec. 31, 2020
Retirement Benefits [Abstract]
Employee participation (as a percent)	93.00%
Employer matching contribution, proportion of employee contribution (as a percent)	50.00%	50.00%
Employer matching contribution, proportion of employee compensation (as a percent)	5.00%	5.00%
Employer contribution amount	$ 0.6	$ 0.5

Regulatory Capital (Details) $ in Thousands	Dec. 31, 2021 USD ($)	Dec. 31, 2020 USD ($)
The Company
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Tier 1 leverage ratio, amount	$ 1,631,257	$ 263,763
Tier 1 leverage ratio	0.1107	0.0829
Tier 1 leverage ratio, minimum capital adequacy, amount	$ 589,614	$ 127,338
Tier 1 leverage ratio, minimum capital adequacy	0.0400	0.0400
Common equity tier 1 capital ratio, amount	$ 1,422,136	$ 248,263
Common equity tier 1 capital ratio	0.4953	0.2153
Common equity tier 1 capital ratio, minimum capital adequacy, amount	$ 129,198	$ 51,882
Common equity tier 1 capital ratio, minimum capital adequacy	4.50%	4.50%
Tier 1 risk-based capital ratio, amount	$ 1,631,257	$ 263,763
Tier 1 risk-based capital ratio	0.5682	0.2288
Tier 1 risk-based capital ratio, minimum capital adequacy, amount	$ 172,264	$ 69,176
Tier 1 risk-based capital ratio, minimum capital adequacy	0.0600	0.0600
Total risk-based capital ratio, amount	$ 1,638,794	$ 270,803
Total risk-based capital ratio	0.5708	0.2349
Total risk-based capital ratio, minimum capital adequacy, amount	$ 229,686	$ 92,234
Total risk-based capital ratio, minimum capital adequacy	0.0800	0.0800
The Bank
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Tier 1 leverage ratio, amount	$ 1,546,693	$ 261,791
Tier 1 leverage ratio	0.1049	0.0822
Tier 1 leverage ratio, minimum capital adequacy, amount	$ 589,595	$ 127,344
Tier 1 leverage ratio, minimum capital adequacy	0.0400	0.0400
Tier 1 leverage ratio, to be well capitalized, amount	$ 736,994	$ 159,180
Tier 1 leverage ratio, to be well capitalized	0.0500	0.0500
Common equity tier 1 capital ratio, amount	$ 1,546,693	$ 261,791
Common equity tier 1 capital ratio	0.5389	0.2271
Common equity tier 1 capital ratio, minimum capital adequacy, amount	$ 129,162	$ 51,869
Common equity tier 1 capital ratio, minimum capital adequacy	4.50%	4.50%
Common equity tier 1 capital ratio, to be well capitalized, amount	$ 186,567	$ 74,923
Common equity tier 1 capital ratio, to be well capitalized	6.50%	6.50%
Tier 1 risk-based capital ratio, amount	$ 1,546,693	$ 261,791
Tier 1 risk-based capital ratio	0.5389	0.2271
Tier 1 risk-based capital ratio, minimum capital adequacy, amount	$ 172,216	$ 69,159
Tier 1 risk-based capital ratio, minimum capital adequacy	0.0600	0.0600
Tier 1 risk-based capital ratio, to be well capitalized, amount	$ 229,622	$ 92,212
Tier 1 risk-based capital ratio, to be well capitalized	0.0800	0.0800
Total risk-based capital ratio, amount	$ 1,554,230	$ 268,831
Total risk-based capital ratio	0.5415	0.2332
Total risk-based capital ratio, minimum capital adequacy, amount	$ 229,622	$ 92,212
Total risk-based capital ratio, minimum capital adequacy	0.0800	0.0800
Total risk-based capital ratio, to be well capitalized, amount	$ 287,027	$ 115,265
Total risk-based capital ratio, to be well capitalized	0.1000	0.1000

Fair Value - Recurring Basis (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Assets
Securities available-for-sale	$ 8,625,259	$ 939,015
Derivative assets	34,056	31,104
Recurring Basis
Assets
Securities available-for-sale	8,625,259	939,015
Derivative assets	34,056	31,104
Total	8,659,315	970,119
Recurring Basis \| Level 1
Assets
Securities available-for-sale	0	0
Derivative assets	0	0
Total	0	0
Recurring Basis \| Level 2
Assets
Securities available-for-sale	8,625,259	939,015
Derivative assets	34,056	31,104
Total	8,659,315	970,119
Recurring Basis \| Level 3
Assets
Securities available-for-sale	0	0
Derivative assets	0	0
Total	$ 0	$ 0

Fair Value - Narrative (Details)	Dec. 31, 2021 USD ($)
Non-recurring basis
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets measured at fair value	$ 0

Fair Value - Non-Recurring Basis (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Assets
Impaired loans	$ 891,166	$ 751,165
Level 1
Assets
Impaired loans	0	0
Level 2
Assets
Impaired loans	0	0
Level 3
Assets
Impaired loans	$ 891,166	751,165
Reverse mortgage and other \| Non-recurring basis
Assets
Impaired loans		317
Reverse mortgage and other \| Non-recurring basis \| Level 1
Assets
Impaired loans		0
Reverse mortgage and other \| Non-recurring basis \| Level 2
Assets
Impaired loans		0
Reverse mortgage and other \| Non-recurring basis \| Level 3
Assets
Impaired loans		$ 317

Fair Value - Valuation Methodology and Unobservable Inputs (Details) $ in Thousands	Dec. 31, 2021 USD ($)	Dec. 31, 2020 USD ($)
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Loans held-for-investment, net, Fair Value	$ 891,166	$ 751,165
Non-recurring basis \| Reverse mortgage and other
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Loans held-for-investment, net, Fair Value		317
Level 3
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Loans held-for-investment, net, Fair Value	$ 891,166	751,165
Level 3 \| Non-recurring basis \| Reverse mortgage and other
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Loans held-for-investment, net, Fair Value		$ 317
Collateral Dependent Impaired Loans \| Valuation, Market Approach \| Level 3 \| Marketability discount
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Measurement input (as a percent)		0.100
Collateral Dependent Impaired Loans \| Weighted Average \| Valuation, Market Approach \| Level 3 \| Marketability discount
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Measurement input (as a percent)		0.100

Fair Value - Fair Value by Balance Sheet Grouping (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Financial assets:
Cash and due from banks, Carrying Amount	$ 208,193	$ 16,405
Cash and due from banks, Fair Value	208,193	16,405
Interest earning deposits, Carrying Amount	5,179,753	2,945,682
Loans held-for-sale, Carrying Amount	893,194	865,961
Loans held-for-sale, Fair Value	893,194	865,961
Loans held-for-investment, net, Carrying Amount	887,304	746,751
Loans held-for-investment, net, Fair Value	891,166	751,165
Accrued interest receivable, Carrying Amount	40,370	8,698
Accrued interest receivable, Fair Value	40,370	8,698
Financial liabilities:
Deposits, Carrying Amount	14,290,628	5,248,026
Deposits, Fair Value	14,167,200	5,458,900
Subordinated debentures, Carrying Amount	15,845	15,831
Subordinated debentures, Fair Value	15,646	15,231
Accrued interest payable, Carrying Amount	223	260
Accrued interest payable, Fair Value	223	260
Interest earning deposits
Financial assets:
Cash and due from banks, Fair Value	5,179,753	2,945,682
Level 1
Financial assets:
Cash and due from banks, Fair Value	208,193	16,405
Loans held-for-sale, Fair Value	0	0
Loans held-for-investment, net, Fair Value	0	0
Accrued interest receivable, Fair Value	41	8
Financial liabilities:
Deposits, Fair Value	0	0
Subordinated debentures, Fair Value	0	0
Accrued interest payable, Fair Value	0	0
Level 1 \| Interest earning deposits
Financial assets:
Cash and due from banks, Fair Value	5,179,753	2,945,682
Level 2
Financial assets:
Cash and due from banks, Fair Value	0	0
Loans held-for-sale, Fair Value	893,194	865,961
Loans held-for-investment, net, Fair Value	0	0
Accrued interest receivable, Fair Value	8,980	2,630
Financial liabilities:
Deposits, Fair Value	14,167,200	5,458,900
Subordinated debentures, Fair Value	15,646	15,231
Accrued interest payable, Fair Value	223	260
Level 2 \| Interest earning deposits
Financial assets:
Cash and due from banks, Fair Value	0	0
Level 3
Financial assets:
Cash and due from banks, Fair Value	0	0
Loans held-for-sale, Fair Value	0	0
Loans held-for-investment, net, Fair Value	891,166	751,165
Accrued interest receivable, Fair Value	31,349	6,060
Financial liabilities:
Deposits, Fair Value	0	0
Subordinated debentures, Fair Value	0	0
Accrued interest payable, Fair Value	0	0
Level 3 \| Interest earning deposits
Financial assets:
Cash and due from banks, Fair Value	$ 0	$ 0

Earnings Per Share - Summary (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Basic
Net income	$ 78,528	$ 26,038
Less: Dividends paid to preferred shareholders	3,016	0
Net income available to common shareholders. basic	$ 75,512	$ 26,038
Weighted average common shares outstanding (shares)	25,582	18,691
Basic earnings per common share (USD per share)	$ 2.95	$ 1.39
Diluted
Net income available to common shareholders	$ 75,512	$ 26,038
Weighted average common shares outstanding for basic earnings per common share (shares)	25,582	18,691
Add: Dilutive effects of stock-based awards (shares)	340	486
Average shares and dilutive potential common shares (shares)	25,922	19,177
Dilutive earnings per common share (USD per share)	$ 2.91	$ 1.36

Earnings Per Share - Narrative (Details) - shares shares in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Earnings Per Share [Abstract]
Stock awards excluded from computation of diluted earnings per share (shares)	33	160

Shareholders' Equity - Narrative (Details) - USD ($)						4 Months Ended	12 Months Ended
Shareholders' Equity - Narrative (Details) - USD ($)	Dec. 09, 2021	Oct. 14, 2021	Aug. 04, 2021	Mar. 09, 2021	Jan. 26, 2021	Jun. 30, 2021	Dec. 31, 2021	Dec. 31, 2020
Class of Stock [Line Items]
Preferred stock authorized (shares)							10,000,000	10,000,000
Preferred stock, par value (USD per share)							$ 0.01	$ 0.01
Preferred stock liquidation preference (USD per share)							$ 1,000	$ 1,000
Aggregate gross proceeds of stock offering							$ 1,291,436,000
Proceeds from preferred stock issuance, net							193,621,000	$ 0
Preferred stock, dividend declared (USD per share)		$ 15.08
Preferred stock, total dividend		$ 3,000,000					3,016,000
Proceeds from common stock issuance, net							$ 1,097,815,000	$ 0
Class A Common Stock
Class of Stock [Line Items]
Common stock authorized (shares)							125,000,000	125,000,000
Common stock, par value (USD per share)							$ 0.01	$ 0.01
Class A Common Stock \| Follow-on Offering, including Over-Allotment Option
Class of Stock [Line Items]
Stock sold during period (shares)	3,806,895				4,563,493
Offering price per share (USD per share)	$ 145.00				$ 63.00
Aggregate gross proceeds of stock offering	$ 552,000,000				$ 287,500,000
Proceeds from common stock issuance, net	$ 530,300,000				$ 272,400,000
Class A Common Stock \| Over-Allotment Option
Class of Stock [Line Items]
Stock sold during period (shares)	496,551				595,238
Class A Common Stock \| At-the-Market Program
Class of Stock [Line Items]
Stock sold during period (shares)						2,793,826
Offering price per share (USD per share)						$ 107.38
Proceeds from common stock issuance, net						$ 295,100,000
Aggregate gross sales price				$ 300,000,000
Class B Common Stock
Class of Stock [Line Items]
Common stock authorized (shares)							25,000,000	25,000,000
Common stock, par value (USD per share)							$ 0.01	$ 0.01
Series A Non-Cumulative Perpetual Preferred Stock, Depositary Share
Class of Stock [Line Items]
Stock sold during period (shares)			8,000,000
Preferred stock liquidation preference (USD per share)			$ 25
Aggregate gross proceeds of stock offering			$ 200,000,000
Proceeds from preferred stock issuance, net			$ 193,700,000
Preferred stock, dividend declared (USD per share)		$ 0.377
Fixed Rate Non-Cumulative Perpetual Preferred Stock, Series A
Class of Stock [Line Items]
Preferred stock, par value (USD per share)			$ 0.01
Ownership interest per depositary share			2.50%
Preferred stock, fixed rate			5.375%
Preferred stock liquidation preference (USD per share)			$ 1,000

Shareholders' Equity - Accumulated Other Comprehensive Income (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance at beginning of period	$ 294,299	$ 231,036
Current period other comprehensive income before reclassification	(47,743)	43,498
Amounts reclassified from accumulated other comprehensive income	(5,215)	(3,863)
Balance at end of period	1,608,836	294,299
Accumulated Other Comprehensive Income/(Loss)
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance at beginning of period	46,036	6,401
Balance at end of period	(6,922)	46,036
Unrealized Gains/ (Losses) on Available-for- Sale Securities
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance at beginning of period	28,958	4,071
Current period other comprehensive income before reclassification	(34,896)	27,566
Amounts reclassified from accumulated other comprehensive income	(3,750)	(2,679)
Balance at end of period	(9,688)	28,958
Derivative Asset/(Liability)
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance at beginning of period	17,078	2,330
Current period other comprehensive income before reclassification	(12,847)	15,932
Amounts reclassified from accumulated other comprehensive income	(1,465)	(1,184)
Balance at end of period	$ 2,766	$ 17,078

- Definition

Total of all stockholders' equity (deficit) items, net of receivables from officers, directors, owners, and affiliates of the entity which are attributable to the parent. The amount of the economic entity's stockholders' equity attributable to the parent excludes the amount of stockholders' equity which is allocable to that ownership interest in subsidiary equity which is not attributable to the parent (noncontrolling interest, minority interest). This excludes temporary equity and is sometimes called permanent equity.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 235
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.4-08(g)(1)(ii))
-URI http://asc.fasb.org/extlink&oid=120395691&loc=d3e23780-122690

Reference 2: http://www.xbrl.org/2003/role/exampleRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 852
-SubTopic 10
-Section 55
-Paragraph 10
-URI http://asc.fasb.org/extlink&oid=84165509&loc=d3e56426-112766

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SAB Topic 4.E)
-URI http://asc.fasb.org/extlink&oid=122038336&loc=d3e74512-122707

Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(31))
-URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682

Reference 5: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(29))
-URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682

Reference 6: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(30))
-URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682

Reference 7: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 50
-Paragraph 28
-Subparagraph (f)
-URI http://asc.fasb.org/extlink&oid=123596393&loc=d3e14064-108612

Reference 8: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 323
-SubTopic 10
-Section 50
-Paragraph 3
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=114001798&loc=d3e33918-111571

+ Details

Parent Company Financial Information - Statements of Financial Condition (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
ASSETS
Cash and due from banks	$ 208,193	$ 16,405
Other assets	100,348	15,696
Total assets	16,005,495	5,586,235
LIABILITIES AND SHAREHOLDERS’ EQUITY
Subordinated debentures, net	15,845	15,831
Accrued expenses and other liabilities	90,186	28,079
Total liabilities	14,396,659	5,291,936
Commitments and contingencies
Preferred stock	2	0
Additional paid-in capital	1,421,592	129,726
Retained earnings	193,860	118,348
Accumulated other comprehensive (loss) income	(6,922)	46,036
Total shareholders’ equity	1,608,836	294,299	$ 231,036
Total liabilities and shareholders’ equity	16,005,495	5,586,235
Class A Common Stock
LIABILITIES AND SHAREHOLDERS’ EQUITY
Common stock	304	188
Class B Common Stock
LIABILITIES AND SHAREHOLDERS’ EQUITY
Common stock	0	1
The Company
ASSETS
Cash and due from banks	84,736	1,991
Investments in subsidiaries	1,540,392	308,740
Other assets	245	236
Total assets	1,625,373	310,967
LIABILITIES AND SHAREHOLDERS’ EQUITY
Subordinated debentures, net	15,845	15,831
Accrued expenses and other liabilities	692	837
Total liabilities	16,537	16,668
Commitments and contingencies
Preferred stock	2	0
Additional paid-in capital	1,421,592	129,726
Retained earnings	193,860	118,348
Accumulated other comprehensive (loss) income	(6,922)	46,036
Total shareholders’ equity	1,608,836	294,299
Total liabilities and shareholders’ equity	1,625,373	310,967
The Company \| Class A Common Stock
LIABILITIES AND SHAREHOLDERS’ EQUITY
Common stock	304	188
The Company \| Class B Common Stock
LIABILITIES AND SHAREHOLDERS’ EQUITY
Common stock	$ 0	$ 1

Parent Company Financial Information - Statements of Operations (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Condensed Financial Statements, Captions [Line Items]
Total interest income	$ 130,394	$ 79,590
Interest expense
Subordinated debentures and other	993	1,083
Total interest expense	1,127	7,226
Net interest expense	129,267	72,364
Noninterest expense
Salaries and employee benefits	45,794	36,493
Occupancy and equipment	2,464	5,690
Communications and data processing	7,072	5,406
Professional services	9,776	4,460
Correspondent bank charges	2,515	1,533
Other general and administrative	6,845	4,525
Total noninterest expense	89,120	59,605
Income before income taxes	85,403	31,194
Income tax benefit	6,875	5,156
Net income	78,528	26,038
Dividends on preferred stock	(3,016)	0
Net income available to common shareholders. basic	75,512	26,038
Net income available to common shareholders, diluted	75,512	26,038
The Company
Condensed Financial Statements, Captions [Line Items]
Total interest income	17	22
Interest expense
Subordinated debentures and other	993	1,083
Total interest expense	993	1,083
Net interest expense	(976)	(1,061)
Noninterest expense
Salaries and employee benefits	1,219	1,071
Occupancy and equipment	102	102
Communications and data processing	174	176
Professional services	1,905	1,104
Correspondent bank charges	0	1
Other general and administrative	429	280
Total noninterest expense	3,829	2,734
Income before income taxes	(4,805)	(3,795)
Income tax benefit	(1,362)	(1,032)
Equity in undistributed earnings of subsidiaries	81,971	28,801
Net income	78,528	26,038
Dividends on preferred stock	(3,016)	0
Net income available to common shareholders. basic	75,512	26,038
Net income available to common shareholders, diluted	$ 75,512	$ 26,038

Parent Company Financial Information - Statements of Cash Flows (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Cash flows from operating activities
Net income	$ 78,528	$ 26,038
Adjustments to reconcile net income to net cash provided by (used in) operating activities:
Other, net	(174)	(70)
Changes in operating assets and liabilities:
Accrued interest receivable and other assets	(93,948)	(6,779)
Accrued expenses and other liabilities	71,628	(1,354)
Net cash provided by (used in) operating activities	79,758	(479,314)
Cash flows from investing activities
Net cash used in investing activities	(7,983,536)	(70,582)
Cash flows from financing activities
Payments made on notes payable	0	(3,714)
Proceeds from common stock issuance, net	1,097,815	0
Proceeds from preferred stock issuance, net	193,621	0
Payments of preferred stock dividends	(3,016)	0
Proceeds from stock option exercise	1,923	41
Taxes paid related to net share settlement of equity awards	(3,308)	(3,335)
Other, net	0	90
Net cash provided by financing activities	10,329,637	3,378,379
Net increase in cash and cash equivalents	2,425,859	2,828,483
Cash and cash equivalents, beginning of period	2,962,087	133,604
Cash and cash equivalents, end of period	5,387,946	2,962,087
The Company
Cash flows from operating activities
Net income	78,528	26,038
Adjustments to reconcile net income to net cash provided by (used in) operating activities:
Equity in undistributed earnings of subsidiaries	(81,971)	(28,801)
Other, net	333	323
Changes in operating assets and liabilities:
Accrued interest receivable and other assets	(35)	187
Accrued expenses and other liabilities	(145)	(424)
Net cash provided by (used in) operating activities	(3,290)	(2,677)
Cash flows from investing activities
Investments in subsidiaries	(1,201,000)	(7,500)
Net cash used in investing activities	(1,201,000)	(7,500)
Cash flows from financing activities
Payments made on notes payable	0	(3,714)
Proceeds from common stock issuance, net	1,097,815	0
Proceeds from preferred stock issuance, net	193,621	0
Payments of preferred stock dividends	(3,016)	0
Proceeds from stock option exercise	1,923	41
Taxes paid related to net share settlement of equity awards	(3,308)	(3,335)
Other, net	0	90
Net cash provided by financing activities	1,287,035	(6,918)
Net increase in cash and cash equivalents	82,745	(17,095)
Cash and cash equivalents, beginning of period	1,991	19,086
Cash and cash equivalents, end of period	$ 84,736	$ 1,991

Subsequent Events (Details) $ / shares in Units, $ in Thousands				12 Months Ended
	Jan. 31, 2022 USD ($) tradingDay shares	Jan. 14, 2022 USD ($) $ / shares	Oct. 14, 2021 USD ($) $ / shares	Dec. 31, 2021 USD ($)
Subsequent Event [Line Items]
Preferred stock, dividend declared (USD per share) \| $ / shares			$ 15.08
Preferred stock, total dividend			$ 3,000	$ 3,016
Series A Non-Cumulative Perpetual Preferred Stock, Depositary Share
Subsequent Event [Line Items]
Preferred stock, dividend declared (USD per share) \| $ / shares			$ 0.377
Subsequent Event
Subsequent Event [Line Items]
Preferred stock, dividend declared (USD per share) \| $ / shares		$ 13.44
Preferred stock, total dividend		$ 2,700
Subsequent Event \| Libra Association, Diem Networks US HoldCo, Inc., Diem Networks US, Inc., Diem Networks II LLC, Diem LLC, and Diem Networks LLC
Subsequent Event [Line Items]
Asset acquisition, cash paid	$ 50,000
Asset acquisition, number of trading days used to determine number of shares issued \| tradingDay	20
Asset acquisition, capitalized direct transaction costs	$ 6,600
Subsequent Event \| Series A Non-Cumulative Perpetual Preferred Stock, Depositary Share
Subsequent Event [Line Items]
Preferred stock, dividend declared (USD per share) \| $ / shares		$ 0.336
Subsequent Event \| Class A Common Stock \| Libra Association, Diem Networks US HoldCo, Inc., Diem Networks US, Inc., Diem Networks II LLC, Diem LLC, and Diem Networks LLC
Subsequent Event [Line Items]
Asset acquisition, purchase agreement, aggregate purchase price	201,200
Asset acquisition, purchase agreement, equity interest payable in shares, amount	$ 151,200
Asset acquisition, number of shares issued (shares) \| shares	1,221,217
Asset acquisition, total transaction consideration	$ 181,600