Cover - shares	3 Months Ended
Cover - shares	Mar. 31, 2024	Apr. 30, 2024
Cover [Abstract]
Document Type	10-Q
Document Quarterly Report	true
Document Period End Date	Mar. 31, 2024
Document Transition Report	false
Entity File Number	001-33572
Entity Registrant Name	Bank of Marin Bancorp
Entity Incorporation, State or Country Code	CA
Entity Tax Identification Number	20-8859754
Entity Address, Address Line One	504 Redwood Blvd.
Entity Address, Address Line Two	Suite 100
Entity Address, City or Town	Novato
Entity Address, State or Province	CA
Entity Address, Postal Zip Code	94947
City Area Code	415
Local Phone Number	763-4520
Title of 12(b) Security	Common stock, no par value
Trading Symbol	BMRC
Security Exchange Name	NASDAQ
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Accelerated Filer
Smaller Reporting Company	false
Emerging Growth Company	false
Entity Shell Company	false
Entity Common Stock, Shares Outstanding		16,285,786
Entity Central Index Key	0001403475
Current Fiscal Year End Date	--12-31
Document Fiscal Year Focus	2024
Document Fiscal Period Focus	Q1
Amendment Flag	false

CONSOLIDATED STATEMENTS OF CONDITION - USD ($) $ in Thousands	Mar. 31, 2024	Dec. 31, 2023
Assets
Cash, cash equivalents and restricted cash	$ 36,308	$ 30,453
Investment securities:
Held-to-maturity, at amortized cost (net of zero allowance for credit losses at March 31, 2024 and December 31, 2023)	915,068	925,198
Available-for-sale, at fair value (net of zero allowance for credit losses at March 31, 2024 and December 31, 2023)	536,365	552,028
Total investment securities	1,451,433	1,477,226
Loans, at amortized cost	2,054,963	2,073,720
Allowance for credit losses on loans	(25,501)	(25,172)
Loans, net of allowance for credit losses on loans	2,029,462	2,048,548
Goodwill	72,754	72,754
Bank-owned life insurance	69,747	68,102
Operating lease right-of-use assets	21,553	20,316
Bank premises and equipment, net	7,546	7,792
Core deposit intangible, net	3,515	3,766
Interest receivable and other assets	74,858	74,946
Total assets	3,767,176	3,803,903
Deposits:
Non-interest bearing	1,444,435	1,441,987
Interest bearing:
Transaction accounts	211,274	225,040
Savings accounts	224,262	233,298
Money market accounts	1,136,595	1,138,433
Time accounts	267,536	251,317
Total deposits	3,284,102	3,290,075
Borrowings and other obligations	260	26,298
Operating lease liabilities	24,150	22,906
Interest payable and other liabilities	21,984	25,562
Total liabilities	3,330,496	3,364,841
Commitments and contingent liabilities (Note 8)
Stockholders' Equity
Preferred stock, no par value, Authorized - 5,000,000 shares, none issued	0	0
Common stock, no par value, Authorized - 30,000,000 shares; issued and outstanding - 16,285,786 and 16,158,413 at March 31, 2024 and December 31, 2023, respectively	218,342	217,498
Retained earnings	273,450	274,570
Accumulated other comprehensive loss, net of taxes	(55,112)	(53,006)
Total stockholders' equity	436,680	439,062
Total liabilities and stockholders' equity	$ 3,767,176	$ 3,803,903

CONSOLIDATED STATEMENTS OF CONDITION (Parenthetical) - USD ($)	Mar. 31, 2024	Dec. 31, 2023
Investment securities:
Held-to-maturity, allowance for credit Loss	$ 0	$ 0
Available-for-sale, allowance for credit loss	$ 0	$ 0
Stockholders' Equity
Preferred stock, authorized (in shares)	5,000,000	5,000,000
Preferred stock, issued (in shares)	0	0
Common stock, authorized (in shares)	30,000,000	30,000,000
Common stock, issued (in shares)	16,285,786	16,158,413
Common stock, outstanding (in shares)	16,285,786	16,158,413

CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) shares in Thousands	3 Months Ended
	Mar. 31, 2024	Dec. 31, 2023	Mar. 31, 2023
Interest income
Interest and fees on loans	$ 25,020,000	$ 24,964,000	$ 24,258,000
Interest on investment securities	8,805,000	9,289,000	10,033,000
Interest on federal funds sold and due from banks	321,000	1,170,000	56,000
Total interest income	34,146,000	35,423,000	34,347,000
Interest expense
Interest on interest-bearing transaction accounts	261,000	278,000	254,000
Interest on savings accounts	371,000	322,000	170,000
Interest on money market accounts	8,449,000	7,188,000	1,085,000
Interest on time accounts	2,280,000	1,991,000	223,000
Interest on borrowings and other obligations	91,000	1,380,000	2,716,000
Total interest expense	11,452,000	11,159,000	4,448,000
Net interest income	22,694,000	24,264,000	29,899,000
Provision for credit losses on loans	350,000	1,300,000	350,000
Reversal of credit losses on unfunded loan commitments	0	0	(174,000)
Net interest income after provision for (reversal of) credit losses	22,344,000	22,964,000	29,723,000
Non-interest income
Earnings on bank-owned life insurance, net	435,000	364,000	705,000
Dividends on Federal Home Loan Bank stock	377,000	349,000	302,000
Losses on sale of investment securities, net of gains	0	(5,907,000)	0
Other income	285,000	337,000	304,000
Total non-interest income	2,754,000	(3,283,000)	2,935,000
Non-interest expense
Salaries and related benefits	12,084,000	10,361,000	10,930,000
Occupancy and equipment	1,969,000	1,939,000	2,414,000
Professional services	1,078,000	921,000	1,123,000
Data processing	1,070,000	1,081,000	1,045,000
Deposit network fees	845,000	940,000	96,000
Federal Deposit Insurance Corporation insurance	435,000	454,000	289,000
Information technology	402,000	431,000	370,000
Depreciation and amortization	388,000	393,000	882,000
Directors' expense	317,000	319,000	321,000
Amortization of core deposit intangible	251,000	330,000	345,000
Other real estate owned	0	0	4,000
Other expense	2,330,000	2,120,000	1,961,000
Total non-interest expense	21,169,000	19,289,000	19,780,000
Income before provision for income taxes	3,929,000	392,000	12,878,000
Provision for income taxes	1,007,000	(218,000)	3,438,000
Net income	$ 2,922,000	$ 610,000	$ 9,440,000
Net income per common share:
Basic (in dollars per share)	$ 0.18	$ 0.04	$ 0.59
Diluted (in dollars per share)	$ 0.18	$ 0.04	$ 0.59
Weighted average shares:
Basic (in shares)	16,081	16,040	15,970
Diluted (in shares)	16,092	16,052	15,999
Comprehensive income:
Net income	$ 2,922,000	$ 610,000	$ 9,440,000
Other comprehensive (loss) income:
Change in net unrealized gains or losses on available-for-sale securities	(4,568,000)	28,865,000	16,213,000
Reclassification adjustment for realized losses on available-for-sale securities in net income	0	5,907,000	0
Reclassification adjustment for gains or losses on fair value hedges	1,217,000	(1,726,000)	0
Amortization of net unrealized losses on securities transferred from available-for-sale to held-to-maturity	361,000	418,000	463,000
Other comprehensive (loss) income, before tax	(2,990,000)	33,464,000	16,676,000
Deferred tax (benefit) expense	(884,000)	9,890,000	4,930,000
Other comprehensive (loss) income, net of tax	(2,106,000)	23,574,000	11,746,000
Total comprehensive income	816,000	24,184,000	21,186,000
Wealth management and trust services
Non-interest income
Wealth management and trust services, debit card interchange fees net, service charges on deposit accounts and merchant interchange fees net	553,000	560,000	511,000
Service charges on deposit accounts
Non-interest income
Wealth management and trust services, debit card interchange fees net, service charges on deposit accounts and merchant interchange fees net	529,000	522,000	533,000
Debit card interchange fees, net
Non-interest income
Wealth management and trust services, debit card interchange fees net, service charges on deposit accounts and merchant interchange fees net	408,000	373,000	447,000
Merchant interchange fees, net
Non-interest income
Wealth management and trust services, debit card interchange fees net, service charges on deposit accounts and merchant interchange fees net	$ 167,000	$ 119,000	$ 133,000

CONSOLIDATED STATEMENTS OF CHANGES IN STOCKHOLDERS' EQUITY - USD ($) $ in Thousands	Total	Common Stock	Retained Earnings	Accumulated Other Comprehensive (Loss) Income, Net of Taxes
Beginning balance (in shares) at Dec. 31, 2022		16,029,138
Beginning balance at Dec. 31, 2022	$ 412,092	$ 215,057	$ 270,781	$ (73,746)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	9,440		9,440
Other comprehensive (loss) income, net of tax	11,746			11,746
Stock options exercised, net of shares surrendered for cashless exercises and tax withholdings (in shares)		11,530
Stock options exercised, net of shares surrendered for cashless exercises and tax withholdings	230	$ 230
Stock issued under employee stock purchase plan (in shares)		415
Stock issued under employee stock purchase plan	9	$ 9
Stock issued under employee stock ownership plan (in shares)		14,300
Stock issued under employee stock ownership plan	$ 423	$ 423
Restricted stock granted (in shares)		49,428
Restricted stock surrendered for tax withholdings upon vesting (in shares)	(2,847)	(2,213)
Restricted stock surrendered for tax withholdings upon vesting	$ (65)	$ (65)
Stock-based compensation - stock options	116	116
Stock-based compensation - restricted stock	45	$ 45
Cash dividends paid on common stock	(4,012)		(4,012)
Stock issued in payment of director fees (in shares)		4,612
Stock issued in payment of director fees	150	$ 150
Ending balance (in shares) at Mar. 31, 2023		16,107,210
Ending balance at Mar. 31, 2023	$ 430,174	$ 215,965	276,209	(62,000)
Beginning balance (in shares) at Dec. 31, 2023	16,158,413	16,158,413
Beginning balance at Dec. 31, 2023	$ 439,062	$ 217,498	274,570	(53,006)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	2,922		2,922
Other comprehensive (loss) income, net of tax	(2,106)			(2,106)
Stock issued under employee stock purchase plan (in shares)		621
Stock issued under employee stock purchase plan	10	$ 10
Stock issued under employee stock ownership plan (in shares)		24,600
Stock issued under employee stock ownership plan	$ 425	$ 425
Restricted stock granted (in shares)		106,964
Restricted stock surrendered for tax withholdings upon vesting (in shares)	(3,338)	(3,338)
Restricted stock surrendered for tax withholdings upon vesting	$ (55)	$ (55)
Restricted stock forfeited / cancelled (in shares)		(13,284)
Stock-based compensation - stock options	17	$ 17
Stock-based compensation - restricted stock	188	$ 188
Cash dividends paid on common stock	(4,042)		(4,042)
Stock issued in payment of director fees (in shares)		11,810
Stock issued in payment of director fees	$ 259	$ 259
Ending balance (in shares) at Mar. 31, 2024	16,285,786	16,285,786
Ending balance at Mar. 31, 2024	$ 436,680	$ 218,342	$ 273,450	$ (55,112)

CONSOLIDATED STATEMENTS OF CHANGES IN STOCKHOLDERS' EQUITY (Parenthetical) - $ / shares	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Statement of Stockholders' Equity [Abstract]
Cash dividends paid on common stock (in dollars per share)	$ 0.25	$ 0.25

CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)

3 Months Ended

Mar. 31, 2024

Mar. 31, 2023

Cash Flows from Operating Activities:

Net income

$ 2,922,000

$ 9,440,000

Adjustments to reconcile net income to net cash provided by operating activities:

Provision for credit losses on loans

350,000

Reversal of credit losses on unfunded loan commitments

0

(174,000)

Noncash contribution expense to employee stock ownership plan

425,000

423,000

Noncash director compensation expense

259,000

150,000

Stock-based compensation expense

205,000

161,000

Amortization of core deposit intangible

251,000

345,000

Amortization of investment security premiums, net of accretion of discounts

1,277,000

1,964,000

Accretion of discounts on acquired loans, net

(98,000)

(168,000)

Net change in deferred loan origination costs/fees

34,000

(324,000)

Depreciation and amortization

388,000

882,000

Loss on disposal of premises and equipment

19,000

0

Earnings on bank-owned life insurance policies

(435,000)

(705,000)

Net changes in interest receivable and other assets

1,082,000

(203,000)

Net changes in interest payable and other liabilities

(2,353,000)

1,303,000

Total adjustments

1,404,000

4,004,000

Net cash provided by operating activities

4,326,000

13,444,000

Cash Flows from Investing Activities:

Proceeds from paydowns/maturities of held-to-maturity securities

10,252,000

13,634,000

Proceeds from paydowns/maturities of available-for-sale securities

10,057,000

19,288,000

Increase (decrease) in loans receivable, net

18,690,000

(19,072,000)

Purchase of bank-owned life insurance policies

(1,210,000)

0

Purchase of premises and equipment

(161,000)

(1,438,000)

Cash paid for low income housing tax credit investment

(1,000)

(38,000)

Net cash provided by investing activities

37,627,000

12,374,000

Cash Flows from Financing Activities:

Net decrease in deposits

(5,973,000)

(322,774,000)

(Repayment of) proceeds from short-term borrowings, net

(26,000,000)

293,400,000

Repayment of finance lease obligations

(38,000)

(37,000)

Proceeds from stock options exercised

0

230,000

Restricted stock surrendered for tax withholdings upon vesting

(55,000)

(65,000)

Cash dividends paid on common stock

(4,042,000)

(4,012,000)

Proceeds from stock issued under employee and director stock purchase plans

10,000

9,000

Net cash used in financing activities

(36,098,000)

(33,249,000)

Net increase (decrease) in cash, cash equivalents and restricted cash

5,855,000

(7,431,000)

Cash, cash equivalents and restricted cash at beginning of period

30,453,000

45,424,000

Cash, cash equivalents and restricted cash at end of period

36,308,000

37,993,000

Supplemental disclosure of cash flow information:

Interest paid on deposits and borrowings

11,087,000

4,290,000

Income taxes paid, net of refunds

0

Supplemental disclosure of noncash investing and financing activities:

Change in net unrealized gains or losses on available-for-sale securities

(4,568,000)

16,213,000

Amortization of net unrealized loss on available-for-sale securities transferred to held-to-maturity

361,000

463,000

Bank-owned life insurance benefit receivable

0

765,000

Restricted cash

^[1]

$ 0

[1]	Restricted cash includes reserve requirements held with the Federal Reserve Bank of San Francisco and other cash pledged. The Federal Reserve reduced the reserve requirement ratios to zero percent effective March 26, 2020.

Basis of Presentation

3 Months Ended

Mar. 31, 2024

Organization, Consolidation and Presentation of Financial Statements [Abstract]

Basis of Presentation

The consolidated financial statements include the accounts of Bancorp, a bank holding company, and its wholly-owned bank subsidiary, Bank of Marin, a California state-chartered commercial bank. References to “we,” “our,” “us” mean Bancorp and the Bank that are consolidated for financial reporting purposes. The accompanying unaudited consolidated interim financial statements have been prepared pursuant to the rules and regulations of the Securities and Exchange Commission ("SEC"). Certain information and note disclosures normally included in annual financial statements prepared in accordance with U.S. generally accepted accounting principles ("GAAP") have been condensed or omitted pursuant to those rules and regulations.

Although we believe that the disclosures are adequate and the information presented is not misleading, we suggest that these interim financial statements be read in conjunction with the annual financial statements and the notes thereto included in our 2023 Annual Report on Form 10-K. In the opinion of management, the unaudited consolidated financial statements reflect all adjustments, which are necessary for a fair presentation of the consolidated financial position, the results of operations, changes in comprehensive income (loss), changes in stockholders’ equity, and cash flows for the periods presented. All material intercompany transactions have been eliminated. The results of these interim periods may not be indicative of the results for the full year or for any other period.

The following table shows: 1) weighted average basic shares, 2) potentially dilutive weighted average common shares related to stock options and unvested restricted stock awards, and 3) weighted average diluted shares. Basic earnings per share (“EPS”) are calculated by dividing net income by the weighted average number of common shares outstanding during each period, excluding unvested restricted stock awards. Diluted EPS are calculated using the weighted average number of potentially dilutive common shares. The number of potentially dilutive common shares included in the quarterly diluted EPS is computed using the average market prices during the three months included in the reporting period under the treasury stock method. The number of potentially dilutive common shares included in year-to-date diluted EPS is a year-to-date weighted average of potentially dilutive common shares included in each quarterly diluted EPS computation. In computing diluted EPS, we exclude anti-dilutive shares such as options whose exercise prices exceed the current common stock price, as they would not reduce EPS under the treasury stock method. We have two forms of outstanding common stock: common stock and unvested restricted stock awards. Holders of unvested restricted stock awards receive non-forfeitable dividends at the same rate as common shareholders and they both share equally in undistributed earnings. Under the two-class method, the difference in EPS is nominal for these participating securities.


	Three months ended
(in thousands, except per share data)	March 31, 2024		March 31, 2023
Weighted average basic common shares outstanding	16,081		15,970
Potentially dilutive common shares related to:
Stock options	—		14
Unvested restricted stock awards	11		15
Weighted average diluted common shares outstanding	16,092		15,999
Net income	$	2,922	$	9,440
Basic EPS	$	0.18	$	0.59
Diluted EPS	$	0.18	$	0.59
Weighted average anti-dilutive common shares not included in the calculation of diluted EPS	340		250

Recently Adopted and Issued Accounting Standards	3 Months Ended
Recently Adopted and Issued Accounting Standards	Mar. 31, 2024
Accounting Policies [Abstract]
Recently Adopted and Issued Accounting Standards	Recently Adopted and Issued Accounting Standards Accounting Standards Adopted in 2024 In June 2022, the FASB issued ASU No. 2022-03, Fair Value Measurement (Topic 820): Fair Value Measurement of Equity Securities Subject to Contractual Sale Restrictions. The amendment reduces diversity in practice by clarifying that a separate contractual restriction on the sale of an equity security is not considered part of the unit of account of the equity security and, therefore, is not considered in measuring fair value. In addition, this ASU provided amended examples to illustrate that a restriction that is a characteristic of the equity security, which market participants would take into account when pricing them, would be considered in measuring fair value. This ASU also introduced new disclosure requirements. The amendments were effective prospectively for years beginning after December 15, 2023. As discussed in Note 4, Investment Securities, in 2023 we sold our remaining shares of Visa Inc. Class B restricted common stock. As a result of the sale, this update had no impact our financial condition, results of operations or disclosures. In March 2023, the FASB issued ASU No. 2023-01, Leases (Topic 842): Common Control Arrangements. For public companies, the amendment requires entities to amortize leasehold improvements associated with common control lease arrangements over the useful life of the improvements to the common control group, as opposed to the shorter of the remaining lease term and the useful life of the improvements for all other operating leases. The amendments were effective for years beginning after December 15, 2023, and may be adopted either prospectively or retrospectively. We currently do not have common control lease arrangements, and therefore the adoption of the amendments had no impact on our financial condition, results of operations or disclosures. In March 2023, the FASB issued ASU No. 2023-02, Investments—Equity Method and Joint Ventures (Topic 323): Accounting for Investments in Tax Credit Structures Using the Proportional Amortization Method. Under current GAAP, an entity can only elect to apply the proportional amortization method to investments in low-income housing tax credit ("LIHTC") structures. The proportional amortization method results in the cost of the investment being amortized in proportion to the income tax credits and other income tax benefits received, with the amortization of the investment and the income tax credits being presented net in the consolidated statements of income as a component of income tax expense (benefit). The amendments will allow entities to elect to account for all other equity investments made primarily for the purpose of receiving income tax credits to using the proportional amortization method, regardless of the tax credit program through which the investment earns income tax credits, when certain conditions are met. The amendments were effective for fiscal years beginning after December 15, 2023, and may be adopted either on a modified retrospective basis or retrospectively. Other than investments in LIHTC funds, as disclosed in Note 4, Investment Securities, we currently have no other equity investments made primarily for the purpose of receiving income tax credits, and therefore the adoption of this ASU had no impact on our financial condition, results of operations or disclosures. Accounting Standards Not Yet Effective In November 2023, the FASB issued ASU No. 2023-07, Segment Reporting (Topic 280): Improvements to Reportable Segment Disclosures. The amendments are intended to improve reportable segment disclosure requirements, primarily through enhanced disclosures about significant segment expenses, enhanced interim disclosure requirements, clarifying circumstances in which an entity can disclose multiple segment measures of profit or loss, providing new segment disclosure requirements for entities with a single reportable segment, and requiring other disclosures. The amendments are effective for annual reporting periods beginning after December 15, 2023 (i.e., 2024 Form 10-K) and interim periods within fiscal years beginning after December 31, 2024, and shall be applied retrospectively to all prior periods presented in the financial statements. Early adoption is permitted. We currently have only one reportable segment and are evaluating the impact the amendments will have on our financial statement disclosures upon adoption. In December 2023, the FASB issued ASU No. 2023-09, Income Taxes (Topic 740): Improvements to Income Tax Disclosures. The amendments require disaggregated information about the effective tax rate reconciliation and additional disclosures on reconciling items and taxes paid that meet a quantitative threshold. The amendments are effective for annual reporting periods beginning after December 15, 2024, and may be adopted either prospectively or retrospectively. Early adoption is permitted. We are currently evaluating the impact of the amendments on our financial statement disclosures upon adoption.

- Definition

The entire disclosure for change in accounting principle. Includes, but is not limited to, nature, reason, and method of adopting amendment to accounting standards or other change in accounting principle.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 944
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-Name Accounting Standards Codification
-Section 65
-Paragraph 2
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Reference 2: http://www.xbrl.org/2003/role/disclosureRef
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Reference 3: http://www.xbrl.org/2003/role/disclosureRef
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Reference 4: http://www.xbrl.org/2003/role/disclosureRef
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Reference 5: http://www.xbrl.org/2003/role/disclosureRef
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Reference 6: http://www.xbrl.org/2003/role/disclosureRef
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Reference 7: http://www.xbrl.org/2003/role/disclosureRef
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Reference 8: http://www.xbrl.org/2003/role/disclosureRef
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-URI https://asc.fasb.org//1943274/2147480528/815-20-65-6

Reference 9: http://www.xbrl.org/2003/role/disclosureRef
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Reference 10: http://www.xbrl.org/2003/role/disclosureRef
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Reference 12: http://www.xbrl.org/2003/role/disclosureRef
-Topic 815
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-Paragraph 2
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Reference 13: http://www.xbrl.org/2003/role/disclosureRef
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-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480175/815-40-65-2

Reference 14: http://www.xbrl.org/2003/role/disclosureRef
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-Paragraph 6
-Subparagraph (f)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147479343/105-10-65-6

Reference 16: http://www.xbrl.org/2003/role/disclosureRef
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-Paragraph 1
-Subparagraph (a)
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-URI https://asc.fasb.org//1943274/2147483443/250-10-50-1

Reference 17: http://www.xbrl.org/2003/role/disclosureRef
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-Name Accounting Standards Codification
-Section 65
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-Subparagraph (e)(1)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482615/740-10-65-8

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-Name Accounting Standards Codification
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Reference 26: http://www.xbrl.org/2003/role/disclosureRef
-Topic 926
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Reference 27: http://www.xbrl.org/2003/role/disclosureRef
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Reference 28: http://www.xbrl.org/2003/role/disclosureRef
-Topic 250
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Reference 29: http://www.xbrl.org/2003/role/disclosureRef
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Reference 31: http://www.xbrl.org/2003/role/disclosureRef
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Reference 33: http://www.xbrl.org/2003/role/disclosureRef
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-URI https://asc.fasb.org//1943274/2147481925/310-20-65-2

+ Details

Fair Value of Assets and Liabilities

3 Months Ended

Mar. 31, 2024

Fair Value Disclosures [Abstract]

Fair Value of Assets and Liabilities

Fair Value Hierarchy and Fair Value Measurement

We group our assets and liabilities that are measured at fair value into three levels within the fair value hierarchy, based on the markets in which the assets and liabilities are traded and the reliability of the assumptions used to determine fair value. These levels are:

Level 1: Valuations are based on unadjusted quoted prices in active markets for identical assets or liabilities.

Level 2: Valuations are based on quoted prices for similar instruments in active markets, quoted prices for identical or similar instruments in markets that are not active and model-based valuations for which all significant assumptions are observable or can be corroborated by observable market data.

Level 3: Valuations are based on unobservable inputs that are supported by little or no market activity and that are significant to the fair value of the assets or liabilities. Values are determined using pricing models and discounted cash flow models and may include significant management judgment and estimation.

Transfers between levels of the fair value hierarchy are recognized through our monthly and/or quarterly valuation process in the reporting period during which the event or circumstances that caused the transfer occurred. No such transfers occurred in the years presented.

The following table summarizes our assets and liabilities that were required to be recorded at fair value on a recurring basis.


(in thousands) Description of Financial Instruments	Carrying Value		Quoted Prices in Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)		Measurement Categories: Changes in Fair Value Recorded In1
March 31, 2024
Securities available-for-sale:
Mortgage-backed securities and collateralized mortgage obligations issued by U.S. government-sponsored agencies	$	340,908	$	—	$	340,908	$	—	OCI
SBA-backed securities	$	17,148	$	—	$	17,148	$	—	OCI
Debentures of government sponsored agencies	$	66,688	$	—	$	66,688	$	—	OCI
U.S. Treasury securities	$	10,534	$	10,534	$	—	$	—	OCI

Obligations of state and political subdivisions	$	90,343	$	—	$	90,343	$	—	OCI
Corporate bonds	$	10,744	$	—	$	10,744	$	—	OCI

Derivative financial assets (interest rate contracts)	$	400	$	—	$	400	$	—	NI
Derivative financial liabilities (interest rate contracts)	$	142	$	—	$	142	$	—	NI
December 31, 2023
Securities available-for-sale:
Mortgage-backed securities and collateralized mortgage obligations issued by U.S. government-sponsored agencies	$	352,472	$	—	$	352,472	$	—	OCI
SBA-backed securities	$	19,471	$	—	$	19,471	$	—	OCI
Debentures of government sponsored agencies	$	66,862	$	—	$	66,862	$	—	OCI
U.S. Treasury securities	$	10,623	$	10,623	$	—	$	—	OCI

Obligations of state and political subdivisions	$	91,882	$	—	$	91,882	$	—	OCI
Corporate bonds	$	10,718	$	—	$	10,718	$	—	OCI

Derivative financial assets (interest rate contracts)	$	287	$	—	$	287	$	—	NI
Derivative financial liabilities (interest rate contracts)	$	1,361	$	—	$	1,361	$	—	NI

1 Other comprehensive income ("OCI") or net income ("NI").

Available-for-sale securities are recorded at fair value on a recurring basis. When available, quoted market prices (Level 1) are used to determine the fair value of available-for-sale securities. Level 1 securities include U.S. Treasury securities. If quoted market prices are not available, we obtain pricing information from a reputable third-party service provider, who may utilize valuation techniques that use current market-based or independently sourced parameters, such as bid/ask prices, dealer-quoted prices, interest rates, benchmark yield curves, prepayment speeds, probability of default, loss severity and credit spreads (Level 2). Level 2 securities include obligations of state and political subdivisions, U.S. agencies or government-sponsored agencies' debt securities, mortgage-backed securities, government agency-issued securities, and corporate bonds. As of March 31, 2024 and December 31, 2023, there were no Level 3 securities.

Held-to-maturity securities may be subject to an allowance for credit losses as a result of our evaluation of expected losses due to credit quality factors. We did not record any credit loss expense on held-to-maturity securities during the three months ended March 31, 2024 or March 31, 2023. Fair value of held-to-maturity securities is determined using the same techniques discussed above for available-for-sale securities.

On a recurring basis, derivative financial instruments are recorded at fair value, which is based on the income approach using observable Level 2 market inputs, reflecting market expectations of future interest rates as of the measurement date. Standard valuation techniques are used to calculate the present value of the future expected cash flows assuming an orderly transaction. Valuation adjustments may be made to reflect both our own credit risk and the counterparties’ credit risk in determining the fair value of the derivatives. These unobservable inputs are not considered significant inputs to the fair value measurement overall. Level 2 inputs for the valuations are limited to observable market prices for Secured Overnight Financing Rate ("SOFR") and Overnight Index Swap ("OIS") rates (for the very short term), quoted prices for SOFR futures contracts, observable market prices for SOFR and OIS swap rates, and one-month and three-month SOFR basis spreads at commonly quoted intervals. Mid-market pricing of the inputs is used as a practical expedient in the fair value measurements. We project spot rates at reset days specified by each swap contract to determine future cash flows, then discount to present value using OIS curves as of the measurement date. When the value of any collateral placed with counterparties is less than the interest rate derivative liability, a credit valuation adjustment ("CVA") is applied to reflect the credit risk we pose to counterparties. We have used the spread between the Standard & Poor's BBB rated U.S. Bank Composite rate and SOFR for the closest maturity term corresponding to the duration of the swaps to derive the CVA. Because there is little to no counterparty risk, we did not incorporate credit adjustments from our assessment of the counterparty credit risk in determining fair value. For further discussion on our methodology for valuing our derivative financial instruments, refer to Note 9, Derivative Financial Instruments and Hedging Activities.

Certain financial assets may be measured at fair value on a non-recurring basis. These assets are subject to fair value adjustments that result from the application of the lower of cost or fair value accounting or write-downs of individual assets, such as individually analyzed loans that are collateral dependent and other real estate owned ("OREO").

(in thousands)

Carrying Value

Quoted Prices in Active Markets for Identical Assets (Level 1)

Significant Other Observable Inputs
(Level 2)

Significant Unobservable Inputs
(Level 3)

Disclosures about Fair Value of Financial Instruments

The table below is a summary of fair value estimates for financial instruments as of March 31, 2024 and December 31, 2023, excluding financial instruments recorded at fair value on a recurring basis (summarized in the first table in this note). The carrying amounts in the following table are recorded in the consolidated statements of condition under the indicated captions. Further, we have not disclosed the fair value of financial instruments specifically excluded from disclosure requirements such as bank-owned life insurance policies ("BOLI"), lease obligations and non-maturity deposit liabilities. Additionally, we held shares of Federal Home Loan Bank ("FHLB") of San Francisco stock at cost as of March 31, 2024 and December 31, 2023. There were no impairments or changes resulting from observable price changes in orderly transactions for the identical or similar investments of the same issuer as of March 31, 2024 or December 31, 2023. See further discussion on values within Note 4, Investment Securities.


	March 31, 2024					December 31, 2023
(in thousands)	Carrying Amounts		Fair Value		Fair Value Hierarchy	Carrying Amounts		Fair Value		Fair Value Hierarchy
Financial assets (recorded at amortized cost)
Cash and cash equivalents	$	36,308	$	36,308	Level 1	$	30,453	$	30,453	Level 1
Investment securities held-to-maturity	915,068		795,909		Level 2	925,198		814,830		Level 2
Loans, net of allowance for credit losses	2,029,462		1,913,418		Level 3	2,048,548		1,939,702		Level 3
Interest receivable	11,678		11,678		Level 2	12,752		12,752		Level 2
Financial liabilities (recorded at amortized cost)
Time deposits	267,536		268,758		Level 2	251,317		252,824		Level 2

FRBSF short-term borrowings under the BTFP	—		—		Level 2	26,000		25,998		Level 2


Interest payable	3,130		3,130		Level 2	2,752		2,752		Level 2

The fair value of loans is based on exit price techniques and obtained from an independent third-party that uses its proprietary valuation model and methodology and may differ from the actual price from a prospective buyer. The discounted cash flow valuation approach reflects key inputs and assumptions that are unobservable, such as loan probability of default, loss given default, prepayment speed, and market discount rates.

The fair value of fixed-rate time deposits is estimated by discounting future contractual cash flows using discount rates that reflect the current observable market rates offered for time deposits of similar remaining maturities.

The value of off-balance-sheet financial instruments is estimated based on the fee income associated with the commitments, which in the absence of credit exposure, is considered to approximate their settlement value. The fair value of commitment fees was not material as of March 31, 2024 or December 31, 2023.

- 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

Investment Securities

3 Months Ended

Mar. 31, 2024

Investments, Debt and Equity Securities [Abstract]

Investment Securities

Our investment securities portfolio consists of U.S. Treasury securities, obligations of state and political subdivisions, U.S. federal government agencies, such as the Government National Mortgage Association ("GNMA") and Small Business Administration ("SBA"), and U.S. government-sponsored enterprises ("GSEs"), such as the Federal National Mortgage Association ("FNMA"), Federal Home Loan Mortgage Corporation ("FHLMC"), Federal Farm Credit Banks Funding Corporation and FHLB, and U.S. Corporations. We also invest in residential and commercial mortgage-backed securities (“MBS”/"CMBS") and collateralized mortgage obligations (“CMOs”) issued or guaranteed by the GSEs, as reflected in the following table.

A summary of the amortized cost, fair value and allowance for credit losses related to securities held-to-maturity as of March 31, 2024 and December 31, 2023 is presented below.


Held-to-maturity:	Amortized Cost 1		Allowance for Credit Losses		Net Carrying Amount		Gross Unrealized				Fair Value
(in thousands)							Gains		(Losses)
March 31, 2024
Securities of U.S. government-sponsored enterprises:
MBS pass-through securities issued by FHLMC, FNMA and GNMA	$	300,976	$	—	$	300,976	$	—	$	(48,474)	$	252,502
CMOs issued by FHLMC	224,676		—		224,676		—		(26,902)		197,774
CMOs issued by FNMA	98,951		—		98,951		—		(6,009)		92,942
CMOs issued by GNMA	50,695		—		50,695		—		(5,436)		45,259
SBA-backed securities	1,652		—		1,652		—		(95)		1,557
Debentures of government-sponsored agencies	146,202		—		146,202		—		(22,942)		123,260
Obligations of state and political subdivisions	61,916		—		61,916		4		(8,022)		53,898
Corporate bonds	30,000		—		30,000		—		(1,283)		28,717
Total held-to-maturity	$	915,068	$	—	$	915,068	$	4	$	(119,163)	$	795,909
December 31, 2023

Securities of U.S. government-sponsored enterprises:
MBS pass-through securities issued by FHLMC, FNMA and GNMA	$	306,261	$	—	$	306,261	$	—	$	(44,396)	$	261,865
CMOs issued by FHLMC	226,416		—		226,416		28		(24,869)		201,575
CMOs issued by FNMA	101,502		—		101,502		—		(4,779)		96,723
CMOs issued by GNMA	51,006		—		51,006		—		(5,235)		45,771
SBA-backed securities	1,853		—		1,853		—		(90)		1,763
Debentures of government-sponsored agencies	146,126		—		146,126		—		(21,994)		124,132
Obligations of state and political subdivisions	62,034		—		62,034		47		(7,884)		54,197
Corporate bonds	30,000		—		30,000		—		(1,196)		28,804
Total held-to-maturity	$	925,198	$	—	$	925,198	$	75	$	(110,443)	$	814,830
1 Amortized cost and fair values exclude accrued interest receivable of $2.5 million and $3.6 million at March 31, 2024 and December 31, 2023, respectively, which is included in interest receivable and other assets in the consolidated statements of condition.

Management measures expected credit losses on held-to-maturity securities collectively by major security type with each type sharing similar risk characteristics, and considers historical credit loss information that is adjusted for current conditions and reasonable and supportable forecasts. With regard to MBSs and CMOs issued or guaranteed by the GSEs, and SBA-backed securities, we expect to receive all the contractual principal and interest on these securities as such securities are backed by the full faith and credit of and/or guaranteed by the U.S. government. Accordingly, no allowance for credit losses has been recorded for these securities. With regard to securities issued by states and political subdivisions and corporate bonds, management considers: (i) issuer and/or guarantor credit ratings, (ii) historical probability of default and loss given default rates for given bond ratings and remaining maturity, (iii) whether issuers continue to make timely principal and interest payments under the contractual terms of the securities, (iv) internal credit review of the financial information, and (v) whether or not such securities have credit enhancements such as guarantees, contain a defeasance clause, or are pre-refunded by the issuers. Based on the comprehensive analysis, no credit losses are expected.

The following table summarizes the amortized cost of our portfolio of held-to-maturity securities issued by states and political subdivisions and corporate bonds by Moody's and/or Standard & Poor's bond ratings as of March 31, 2024 and December 31, 2023.


	Obligations of state and political subdivisions				Corporate bonds
(in thousands)	March 31, 2024		December 31, 2023		March 31, 2024		December 31, 2023
Aaa / AAA	$	42,474	$	42,577	$	—	$	—
Aa2 / AA	19,442		19,457		—		—
A2 / A	—		—		30,000		30,000
Total	$	61,916	$	62,034	$	30,000	$	30,000

A summary of the amortized cost, fair value and allowance for credit losses related to securities available-for-sale as of March 31, 2024 and December 31, 2023 is presented below.


Available-for-sale:	Amortized Cost 1		Gross Unrealized				Allowance for Credit Losses		Fair Value
(in thousands)			Gains		(Losses)
March 31, 2024
Securities of U.S. government-sponsored enterprises:
MBS pass-through securities issued by FHLMC, FNMA and GNMA	$	79,460	$	2	$	(10,073)	$	—	$	69,389
CMOs issued by FHLMC	261,797		—		(26,837)		—		234,960
CMOs issued by FNMA	23,099		—		(2,835)		—		20,264
CMOs issued by GNMA	19,486		—		(3,191)		—		16,295
SBA-backed securities	18,805		—		(1,657)		—		17,148
Debentures of government- sponsored agencies	73,906		—		(7,218)		—		66,688

U.S. Treasury securities	11,928		—		(1,394)		—		10,534
Obligations of state and political subdivisions	101,911		—		(11,568)		—		90,343
Corporate bonds	11,992		—		(1,248)		—		10,744

Total available-for-sale	$	602,384	$	2	$	(66,021)	$	—	$	536,365
December 31, 2023
Securities of U.S. government-sponsored enterprises:
MBS pass-through securities issued by FHLMC, FNMA and GNMA	$	81,937	$	2	$	(9,516)	$	—	$	72,423
CMOs issued by FHLMC	266,407		—		(24,758)		—		241,649
CMOs issued by FNMA	23,987		—		(2,715)		—		21,272
CMOs issued by GNMA	20,006		—		(2,878)		—		17,128
SBA-backed securities	21,126		—		(1,655)		—		19,471
Debentures of government- sponsored agencies	73,899		—		(7,037)		—		66,862

U.S. Treasury securities	11,923		—		(1,300)				10,623
Obligations of state and political subdivisions	102,202		1		(10,321)		—		91,882
Corporate bonds	11,992		—		(1,274)		—		10,718

Total available-for-sale	$	613,479	$	3	$	(61,454)	$	—	$	552,028
1 Amortized cost and fair value exclude accrued interest receivable of $2.3 million and $2.3 million at March 31, 2024 and December 31, 2023, respectively, which is included in interest receivable and other assets in the consolidated statements of condition.

The amortized cost and fair value of investment debt securities by contractual maturity at March 31, 2024 and December 31, 2023 are shown below. Expected maturities may differ from contractual maturities if the issuers of the securities have the right to call or prepay obligations with or without call or prepayment penalties.


	March 31, 2024								December 31, 2023
	Held-to-Maturity				Available-for-Sale				Held-to-Maturity				Available-for-Sale
(in thousands)	Amortized Cost		Fair Value		Amortized Cost		Fair Value		Amortized Cost		Fair Value		Amortized Cost		Fair Value
Within one year	$	15,000	$	14,615	$	4,181	$	4,076	$	—	$	—	$	101	$	100
After one but within five years	72,200		69,109		249,923		228,662		87,887		84,541		226,669		208,444
After five years through ten years	304,877		259,599		62,426		54,421		304,976		261,654		95,552		85,447
After ten years	522,991		452,586		285,854		249,206		532,335		468,635		291,157		258,037
Total	$	915,068	$	795,909	$	602,384	$	536,365	$	925,198	$	814,830	$	613,479	$	552,028

There were no sales of investment securities in the first quarter of 2024 or 2023.

Three months ended

The reported values of pledged investment securities are shown in the following table.


(in thousands)	March 31, 2024		December 31, 2023
Pledged to the State of California:
Secure public deposits in compliance with the Local Agency Security Program	$	282,826	$	287,436
Collateral for trust deposits	659		666
Collateral for Wealth Management and Trust Services checking account	557		562
Total investment securities pledged to the State of California	284,042		288,664
Bankruptcy trustee deposits pledged with Federal Reserve Bank	1,003		1,151
Pledged to FHLB Securities-Backed Credit Program	296,614		383,484
Pledged to the Federal Reserve "BTFP"	—		265,660
Pledged to the Federal Reserve Discount Window	345,896		—
Total pledged investment securities	$	927,555	$	938,959

There were 317 and 313 securities in unrealized loss positions at March 31, 2024 and December 31, 2023, respectively. Those securities are summarized and classified according to the duration of the loss period in the tables below:


March 31, 2024	< 12 continuous months				≥ 12 continuous months				Total securities in a loss position
(in thousands)	Fair value		Unrealized loss		Fair value		Unrealized loss		Fair value		Unrealized loss
Held-to-maturity:
MBS pass-through securities issued by FHLMC, FNMA and GNMA	$	—	$	—	$	252,501	$	(48,474)	$	252,501	$	(48,474)
CMOs issued by FHLMC	12,455		(68)		185,319		(26,834)		197,774		(26,902)
CMOs issued by FNMA	40,962		(1,054)		51,980		(4,955)		92,942		(6,009)
CMOs issued by GNMA	10,808		(350)		34,452		(5,086)		45,260		(5,436)
SBA-backed securities	—		—		1,556		(95)		1,556		(95)
Debentures of government-sponsored agencies	—		—		123,260		(22,942)		123,260		(22,942)
Obligations of state and political subdivisions	6,589		(46)		44,242		(7,976)		50,831		(8,022)
Corporate bonds	—		—		28,717		(1,283)		28,717		(1,283)
Total held-to-maturity	70,814		(1,518)		722,027		(117,645)		792,841		(119,163)
Available-for-sale:
MBS pass-through securities issued by FHLMC, FNMA and GNMA	3		—		69,152		(10,073)		69,155		(10,073)
CMOs issued by FHLMC	958		(4)		234,002		(26,833)		234,960		(26,837)
CMOs issued by FNMA	—		—		20,264		(2,835)		20,264		(2,835)
CMOs issued by GNMA	—		—		16,295		(3,191)		16,295		(3,191)
SBA-backed securities	—		—		17,148		(1,657)		17,148		(1,657)
Debentures of government- sponsored agencies	—		—		66,688		(7,218)		66,688		(7,218)
U.S. Treasury securities	—		—		10,534		(1,394)		10,534		(1,394)

Obligations of state and political subdivisions	557		(2)		89,786		(11,566)		90,343		(11,568)
Corporate bonds	—		—		10,744		(1,248)		10,744		(1,248)

Total available-for-sale	1,518		(6)		534,613		(66,015)		536,131		(66,021)
Total securities at loss position	$	72,332	$	(1,524)	$	1,256,640	$	(183,660)	$	1,328,972	$	(185,184)


December 31, 2023	< 12 continuous months				≥ 12 continuous months				Total securities in a loss position
(in thousands)	Fair value		Unrealized loss		Fair value		Unrealized loss		Fair value		Unrealized loss
Held-to-maturity:
MBS pass-through securities issued by FHLMC, FNMA and GNMA	$	—	$	—	$	261,865	$	(44,396)	$	261,865	$	(44,396)
CMOs issued by FHLMC	8,662		(21)		188,657		(24,848)		197,319		(24,869)
CMOs issued by FNMA	42,474		(411)		54,249		(4,368)		96,723		(4,779)
CMOs issued by GNMA	10,988		(244)		34,783		(4,991)		45,771		(5,235)
SBA-backed securities	—		—		1,763		(90)		1,763		(90)
Debentures of government- sponsored agencies	—		—		124,132		(21,994)		124,132		(21,994)
Obligations of state and political subdivisions	—		—		44,437		(7,884)		44,437		(7,884)
Corporate Bonds	—		—		28,804		(1,196)		28,804		(1,196)
Total held-to-maturity	62,124		(676)		738,690		(109,767)		800,814		(110,443)
Available-for-sale:
MBS pass-through securities issued by FHLMC, FNMA and GNMA	—		—		72,146		(9,516)		72,146		(9,516)
CMOs issued by FHLMC	1,235		(7)		240,414		(24,751)		241,649		(24,758)
CMOs issued by FNMA	—		—		21,272		(2,715)		21,272		(2,715)
CMOs issued by GNMA	—		—		17,128		(2,878)		17,128		(2,878)
SBA-backed securities	—		—		19,471		(1,655)		19,471		(1,655)
Debentures of government- sponsored agencies	—		—		66,862		(7,037)		66,862		(7,037)
U.S. Treasury securities	—		—		10,623		(1,300)		10,623		(1,300)
Obligations of state and political subdivisions	666		(1)		90,655		(10,320)		91,321		(10,321)
Corporate Bonds	—		—		10,718		(1,274)		10,718		(1,274)


Total available-for-sale	1,901		(8)		549,289		(61,446)		551,190		(61,454)
Total securities at loss position	$	64,025	$	(684)	$	1,287,979	$	(171,213)	$	1,352,004	$	(171,897)

As of March 31, 2024, the investment portfolio included 306 investment securities that had been in a continuous loss position for twelve months or more and 11 investment securities that had been in a loss position for less than twelve months.

Securities issued by government-sponsored agencies, such as FNMA and FHLMC, usually have implicit credit support from the U.S. federal government. However, since 2008, FNMA and FHLMC have been under government conservatorship and, therefore, contractual cash flows for these investments carry explicit guarantees by the U.S. federal government while FNMA and FHLMC remain under conservatorship. Securities issued by the SBA and GNMA have explicit credit guarantees by the U.S. federal government, which protects us from credit losses on the contractual cash flows of the securities.

Our investments in obligations of state and political subdivision bonds are deemed creditworthy after our comprehensive analysis of the issuers' latest financial information, credit ratings by major credit agencies, and/or credit enhancements.

No allowances for credit losses have been recognized on available-for-sale securities in an unrealized loss position, as management does not believe any of the securities are impaired due to credit risk factors at either March 31, 2024 or December 31, 2023. In addition, for any available-for-sale securities in an unrealized loss position at March 31, 2024 and December 31, 2023, the Bank assessed whether it intended to sell the securities, or if it was more likely than not that it would be required to sell the securities before recovery of its amortized cost basis, which would require a write-down to fair value through net income. Because the Bank did not intend to sell those securities that were in an unrealized loss position, and it was not more-likely-than-not that the Bank would be required to sell the securities before recovery of their amortized cost bases, the Bank determined that no write-down was necessary as of the reporting date.

On July 7, 2023, the Bank entered into various interest rate swap agreements with notional values totaling $101.8 million to hedge balance sheet interest rate sensitivity and protect selected securities in its available-for-sale

portfolio against changes in fair value related to changes in the benchmark interest rate. For additional details, refer to Note 9, Derivative Financial Instruments and Hedging Activities.

Non-Marketable Securities Included in Other Assets

FHLB Capital Stock

As a member of the FHLB, we are required to maintain a minimum investment in FHLB capital stock as determined by the Board of Directors of the FHLB. The minimum investment requirements can increase in the event we increase our total asset size or borrowings with the FHLB. Shares cannot be purchased or sold except between the FHLB and its members at the $100 per share par value. We held $16.7 million of FHLB stock included in other assets on the consolidated statements of condition at both March 31, 2024 and December 31, 2023. The carrying amounts of these investments are reasonable estimates of fair value because the securities are restricted to member banks and they do not have a readily determinable market value. Based on our analysis of FHLB's financial condition and certain qualitative factors, we determined that the FHLB stock was not impaired at March 31, 2024 and December 31, 2023. On April 25, 2024, FHLB announced a cash dividend for the first quarter of 2024 at an annualized dividend rate of 8.25% to be distributed in mid-May 2024. Cash dividends paid on FHLB capital stock are recorded as non-interest income.

For further information, refer to Note 8, Commitments and Contingencies.

Low Income Housing Tax Credits

We invest in low-income housing tax credit funds as a limited partner, which totaled $1.9 million and $2.0 million recorded in other assets as of March 31, 2024 and December 31, 2023, respectively. In the first three months of 2024, we recognized $133 thousand of low-income housing tax credits and other tax benefits, offset by $111 thousand of amortization expense of low-income housing tax credit investment, as a component of income tax expense. As of March 31, 2024, our unfunded commitments for these low-income housing tax credit funds totaled $343 thousand. We did not recognize any impairment losses on these low-income housing tax credit investments during the first three months of 2024 or 2023, as the value of the future tax benefits exceeds the carrying value of the investments.

Loans and Allowance for Credit Losses on Loans

3 Months Ended

Mar. 31, 2024

Receivables [Abstract]

Loans and Allowance for Credit Losses on Loans

The following table presents the amortized cost of loans by portfolio class as of March 31, 2024 and December 31, 2023.


(in thousands)	March 31, 2024		December 31, 2023
Commercial and industrial	$	150,896	$	153,750
Real estate:
Commercial owner-occupied	328,560		333,181
Commercial non-owner occupied	1,236,633		1,219,385
Construction	71,494		99,164
Home equity	86,794		82,087
Other residential	113,479		118,508
Installment and other consumer loans	67,107		67,645
Total loans, at amortized cost 1	2,054,963		2,073,720
Allowance for credit losses on loans	(25,501)		(25,172)
Total loans, net of allowance for credit losses on loans	$	2,029,462	$	2,048,548

1 Amortized cost includes net deferred loan origination costs of $2.6 million and $2.7 million at March 31, 2024 and December 31, 2023, respectively. Amounts are also net of unrecognized purchase discounts of $1.9 million and $2.0 million at March 31, 2024 and December 31, 2023, respectively. Amortized cost excludes accrued interest, which totaled $6.3 million and $6.6 million at March 31, 2024 and December 31, 2023, respectively, and is included in interest receivable and other assets in the consolidated statements of condition.

Lending Risks

Commercial and Industrial Loans - Commercial loans are generally made to established small and mid-sized businesses to provide financing for their growth and working capital needs, equipment purchases and acquisitions. Management examines historical, current, and projected cash flows to determine the ability of the

borrower to repay obligations as agreed. Commercial loans are made based primarily on the identified cash flows of the borrower and secondarily on the underlying collateral and guarantor support. The cash flows of borrowers, however, may not occur as expected, and the collateral securing these loans may fluctuate in value. Most commercial and industrial loans are secured by the assets being financed, such as accounts receivable and inventory, and typically include personal guarantees. We target stable businesses with guarantors who provide additional sources of repayment and have proven to be resilient in periods of economic stress. A weakened economy, and resultant decreased consumer and/or business spending, may have an effect on the credit quality of commercial loans.

Commercial Real Estate Loans - Commercial real estate loans, which include income producing investment properties and owner-occupied real estate used for business purposes, are subject to underwriting standards and processes similar to commercial loans discussed above. We underwrite these loans to be repaid from cash flow from either the business or investment property and supported by real property collateral. Underwriting standards for commercial real estate loans include, but are not limited to, debt coverage and loan-to-value ratios. Furthermore, a large majority of our loans are guaranteed by the owners of the properties. Conditions in the real estate markets or downturn in the general economy may adversely affect our commercial real estate loans. In the event of a vacancy, we expect guarantors to carry the loans until they find a replacement tenant. The owner's substantial equity investment provides a strong economic incentive to continue to support the commercial real estate projects. As such, we have generally experienced a relatively low level of loss and delinquencies in this portfolio.

Construction Loans - Construction loans are generally made to developers and builders to finance construction, renovation and occasionally land acquisitions in anticipation of near-term development. Construction loans include interest reserves that are used for the payment of interest during the development and marketing periods and are capitalized as part of the loan balance. When a construction loan is placed on nonaccrual status before the depletion of the interest reserve, we apply the interest funded by the interest reserve against the loan's principal balance. These loans are underwritten after evaluation of the borrower's financial strength, reputation, prior track record, and independent appraisals. We monitor all construction projects to determine whether they are on schedule, completed as planned and in accordance with the approved construction budgets. Significant events can affect the construction industry, including: the inherent volatility of real estate markets and vulnerability to delays due to weather, change orders, inability to obtain construction permits, labor or material shortages, and price changes. Estimates of construction costs and value associated with the completed project may be inaccurate. Repayment of construction loans is largely dependent on the ultimate success of the project.

Consumer Loans - Consumer loans primarily consist of home equity lines of credit, other residential loans, floating homes, and indirect luxury auto loans, along with a small number of installment loans. Our other residential loans include tenancy-in-common fractional interest loans ("TIC") located almost entirely in San Francisco County. We originate consumer loans utilizing credit score information, debt-to-income ratio and loan-to-value ratio analysis. Diversification among consumer loan types, coupled with relatively small loan amounts that are spread across many individual borrowers, mitigates risk. We do not originate sub-prime residential mortgage loans, nor is it our practice to underwrite loans commonly referred to as "Alt-A mortgages," the characteristics of which are reduced documentation, borrowers with low FICO scores or collateral with high loan-to-value ratios.

Credit Quality Indicators

We use a risk rating system to evaluate asset quality, and to identify and monitor credit risk in individual loans, and in the loan portfolio. Our definitions of “Special Mention” risk graded loans, or worse, are consistent with those used by the Federal Deposit Insurance Corporation ("FDIC"). Our internally assigned grades are as follows:

Pass and Watch - Loans to borrowers of acceptable or better credit quality. Borrowers in this category demonstrate fundamentally sound financial positions, repayment capacity, credit history and management expertise. Loans in this category must have an identifiable and stable source of repayment and meet the Bank’s policy regarding debt-service-coverage ratios. These borrowers are capable of sustaining normal economic, market or operational setbacks without significant financial consequences. Negative external industry factors are generally not present. The loan may be secured, unsecured or supported by non-real estate collateral for which the value is more difficult to determine and/or marketability is more uncertain. This category also includes “Watch” loans, where the primary source of repayment has been delayed. “Watch” is intended to be a transitional grade, with either an upgrade or downgrade within a reasonable period.

Special Mention - Potential weaknesses that deserve close attention. If left uncorrected, those potential weaknesses may result in deterioration of the payment prospects for the asset. Special Mention assets do not present sufficient risk to warrant adverse classification.

Substandard - Inadequately protected by either the current sound worth and paying capacity of the obligor or the collateral pledged, if any. A Substandard asset has well-defined weaknesses that jeopardize the liquidation of the debt. Substandard assets are characterized by the distinct possibility that we will sustain some loss if such weaknesses or deficiencies are not corrected. Well-defined weaknesses include adverse trends or developments of the borrower’s financial condition, managerial weaknesses and/or significant collateral deficiencies.

Doubtful - Critical weaknesses that make collection or liquidation in full improbable. There may be specific pending events that work to strengthen the asset; however, the amount or timing of the loss may not be determinable. Pending events generally occur within one year of the asset being classified as Doubtful. Examples include: merger, acquisition, or liquidation; capital injection; guarantee; perfecting liens on additional collateral; and refinancing. Such loans are placed on non-accrual status and usually are collateral-dependent.

We regularly review our credits for accuracy of risk grades whenever we receive new information and at each quarterly and year-end reporting period. Borrowers are generally required to submit financial information at regular intervals. Typically, commercial borrowers with lines of credit are required to submit financial information with reporting intervals ranging from monthly to annually depending on credit size, risk and complexity. In addition, investor commercial real estate borrowers with loans exceeding a certain dollar threshold are usually required to submit rent rolls or property income statements annually. We monitor construction loans monthly. We review home equity and other consumer loans based on delinquency. We also review loans graded “Watch” or worse, regardless of loan type, no less than quarterly.

The following tables present the loan portfolio by loan portfolio class, origination/renewal year and internal risk rating as of March 31, 2024 and December 31, 2023. The current year vintage table reflects gross charge-offs by loan portfolio class and year of origination. Generally, existing term loans that were re-underwritten are reflected in the table in the year of renewal. Lines of credit that have a conversion feature at the time of origination, such as construction to perm loans, are presented by year of origination.


(in thousands)	Term Loans - Amortized Cost by Origination Year												Revolving Loans Amortized Cost
March 31, 2024	2024		2023		2022		2021		2020		Prior				Total
Commercial and industrial:
Pass and Watch	$	2,650	$	23,105	$	9,107	$	2,726	$	3,474	$	33,698	$	64,683	$	139,443
Special Mention	—		—		—		—		—		306		1,443		1,749
Substandard	—		—		—		—		—		2,191		7,513		9,704
Total commercial and industrial	$	2,650	$	23,105	$	9,107	$	2,726	$	3,474	$	36,195	$	73,639	$	150,896
Gross current period charge-offs	$	—	$	—	$	—	$	—	$	—	$	—	$	(4)	$	(4)

Commercial real estate, owner-occupied:
Pass and Watch	$	3,187	$	14,053	$	45,948	$	49,506	$	36,162	$	148,036	$	5	$	296,897
Special Mention	—		386		—		15,491		816		10,113		—		26,806
Substandard	—		—		2,201		—		—		2,656		—		4,857

Total commercial real estate, owner-occupied	$	3,187	$	14,439	$	48,149	$	64,997	$	36,978	$	160,805	$	5	$	328,560

Commercial real estate, non-owner occupied:
Pass and Watch	$	20,233	$	76,466	$	171,120	$	196,087	$	161,259	$	502,571	$	10,102	$	1,137,838
Special Mention	—		—		2,776		8,309		11,696		36,797		—		59,578
Substandard	278		872		—		2,174		—		35,893		—		39,217

Total commercial real estate, non-owner occupied	$	20,511	$	77,338	$	173,896	$	206,570	$	172,955	$	575,261	$	10,102	$	1,236,633


(in thousands)	Term Loans - Amortized Cost by Origination Year												Revolving Loans Amortized Cost
March 31, 2024	2024		2023		2022		2021		2020		Prior				Total
Construction:
Pass and Watch	$	13,915	$	7,661	$	17,794	$	—	$	19,310	$	—	$	—	$	58,680
Special Mention	—		12,814		—		—		—		—		—		12,814

Total construction	$	13,915	$	20,475	$	17,794	$	—	$	19,310	$	—	$	—	$	71,494

Home equity:
Pass and Watch	$	—	$	—	$	—	$	—	$	—	$	764	$	85,149	$	85,913

Substandard	82		—		—		—		—		177		622		881
Total home equity	$	82	$	—	$	—	$	—	$	—	$	941	$	85,771	$	86,794

Other residential:
Pass and Watch	$	—	$	17,765	$	20,010	$	13,295	$	25,462	$	36,947	$	—	$	113,479


Total other residential	$	—	$	17,765	$	20,010	$	13,295	$	25,462	$	36,947	$	—	$	113,479

Installment and other consumer:
Pass and Watch	$	3,379	$	20,119	$	13,769	$	10,129	$	4,489	$	14,078	$	1,003	$	66,966

Substandard	—		—		—		141		—		—		—		141
Total installment and other consumer	$	3,379	$	20,119	$	13,769	$	10,270	$	4,489	$	14,078	$	1,003	$	67,107
Gross current period charge-offs	$	—	$	(14)	$	—	$	(3)	$	—	$	—	$	—	$	(17)
Total loans:
Pass and Watch	$	43,364	$	159,169	$	277,748	$	271,743	$	250,156	$	736,094	$	160,942	$	1,899,216
Total Special Mention	$	—	$	13,200	$	2,776	$	23,800	$	12,512	$	47,216	$	1,443	$	100,947
Total Substandard	$	360	$	872	$	2,201	$	2,315	$	—	$	40,917	$	8,135	$	54,800

Totals	$	43,724	$	173,241	$	282,725	$	297,858	$	262,668	$	824,227	$	170,520	$	2,054,963
Total gross current period charge-offs	$	—	$	(14)	$	—	$	(3)	$	—	$	—	$	(4)	$	(21)


(in thousands)	Term Loans - Amortized Cost by Origination Year												Revolving Loans Amortized Cost
December 31, 2023	2023		2022		2021		2020		2019		Prior				Total
Commercial and industrial:
Pass and Watch	$	25,615	$	9,187	$	2,970	$	3,718	$	15,128	$	21,004	$	62,486	$	140,108
Special Mention	—		—		—		—		334		—		9,300		9,634
Substandard	—		—		—		—		1,311		2,697		—		4,008
Total commercial and industrial	$	25,615	$	9,187	$	2,970	$	3,718	$	16,773	$	23,701	$	71,786	$	153,750

Commercial real estate, owner-occupied:
Pass and Watch	$	13,128	$	41,808	$	49,887	$	37,708	$	40,994	$	114,018	$	56	$	297,599
Special Mention	1,431		4,498		15,636		820		286		8,902		—		31,573
Substandard	—		2,231		—		—		—		1,778		—		4,009

Total commercial real estate, owner-occupied	$	14,559	$	48,537	$	65,523	$	38,528	$	41,280	$	124,698	$	56	$	333,181
Commercial real estate, non-owner occupied:
Pass and Watch	$	76,718	$	172,028	$	196,340	$	150,831	$	139,860	$	368,675	$	9,832	$	1,114,284
Special Mention	—		2,790		9,498		11,776		15,708		41,602		—		81,374
Substandard	878		272		2,204		—		—		20,373		—		23,727
Total commercial real estate, non-owner occupied	$	77,596	$	175,090	$	208,042	$	162,607	$	155,568	$	430,650	$	9,832	$	1,219,385
Construction:
Pass and Watch	$	13,138	$	24,403	$	19,521	$	29,512	$	—	$	—	$	—	$	86,574
Special Mention	12,590		—		—		—		—		—		—		12,590

Total construction	$	25,728	$	24,403	$	19,521	$	29,512	$	—	$	—	$	—	$	99,164
Home equity:
Pass and Watch	$	—	$	—	$	—	$	—	$	—	$	734	$	80,773	$	81,507

Substandard	—		—		—		—		—		369		211		580
Total home equity	$	—	$	—	$	—	$	—	$	—	$	1,103	$	80,984	$	82,087
Other residential:
Pass and Watch	$	17,861	$	20,114	$	13,390	$	25,637	$	20,935	$	20,571	$	—	$	118,508


Total other residential	$	17,861	$	20,114	$	13,390	$	25,637	$	20,935	$	20,571	$	—	$	118,508
Installment and other consumer:
Pass and Watch	$	22,038	$	14,528	$	10,632	$	4,687	$	5,300	$	9,399	$	1,061	$	67,645


Total installment and other consumer	$	22,038	$	14,528	$	10,632	$	4,687	$	5,300	$	9,399	$	1,061	$	67,645

Total loans:
Pass and Watch	$	168,498	$	282,068	$	292,740	$	252,093	$	222,217	$	534,401	$	154,208	$	1,906,225
Total Special Mention	$	14,021	$	7,288	$	25,134	$	12,596	$	16,328	$	50,504	$	9,300	$	135,171
Total Substandard	$	878	$	2,503	$	2,204	$	—	$	1,311	$	25,217	$	211	$	32,324

Totals	$	183,397	$	291,859	$	320,078	$	264,689	$	239,856	$	610,122	$	163,719	$	2,073,720

The following table shows the amortized cost of loans by portfolio class, payment aging and non-accrual status as of March 31, 2024 and December 31, 2023.


Loan Aging Analysis by Class
(in thousands)	Commercial and industrial		Commercial real estate, owner-occupied		Commercial real estate, non-owner occupied		Construction		Home equity		Other residential		Installment and other consumer		Total
March 31, 2024
30-59 days past due	$	13	$	101	$	872	$	1,057	$	360	$	—	$	3	$	2,406
60-89 days past due	390		—		—		—		—		—		—		390
90 days or more past due 1	29		140		10,292		—		—		—		—		10,461
Total past due	432		241		11,164		1,057		360		—		3		13,257
Current	150,464		328,319		1,225,469		70,437		86,434		113,479		67,104		2,041,706
Total loans 1	$	150,896	$	328,560	$	1,236,633	$	71,494	$	86,794	$	113,479	$	67,107	$	2,054,963
Non-accrual loans 2	$	2,220	$	416	$	3,045	$	—	$	473	$	—	$	141	$	6,295
Non-accrual loans with no allowance	$	—	$	416	$	872	$	—	$	473	$	—	$	141	$	1,902
December 31, 2023
30-59 days past due	$	2,991	$	618	$	—	$	—	$	43	$	83	$	195	$	3,930
60-89 days past due	69		—		2,204		—		—		—		1		2,274
90 days or more past due 1	1,311		149		—		—		—		—		—		1,460
Total past due	4,371		767		2,204		—		43		83		196		7,664
Current	149,379		332,414		1,217,181		99,164		82,044		118,425		67,449		2,066,056
Total loans 1	$	153,750	$	333,181	$	1,219,385	$	99,164	$	82,087	$	118,508	$	67,645	$	2,073,720
Non-accrual loans 2	$	4,008	$	434	$	3,081	$	—	$	469	$	—	$	—	$	7,992
Non-accrual loans with no allowance	$	1,311	$	434	$	877	$	—	$	469	$	—	$	—	$	3,091

1 There was one non-owner occupied commercial real estate loan 90 days past due and accruing interest as of March 31, 2024 that has been in extended renewal negotiations, but it is well-secured and expected to be restored to a current payment status in the near future. There were no non-performing loans over 90 days past due and accruing interest as of December 31, 2023.

2 None of the non-accrual loans as of March 31, 2024 or December 31, 2023 were earning interest on a cash or accrual basis. We reversed $10 thousand in accrued interest income for loans that were placed on non-accrual status during the three months ended March 31, 2024. We reversed accrued interest income of $16 thousand for loans that were placed on non-accrual status during the three months ended March 31, 2023.

Collateral Dependent Loans

The following table presents the amortized cost basis of individually analyzed collateral-dependent loans, which were all on non-accrual status, by portfolio class at March 31, 2024 and December 31, 2023.


	Amortized Cost by Collateral Type
(in thousands)	Commercial Real Estate		Residential Real Estate		Blanket Lien		Other		Total 1		Allowance for Credit Losses

March 31, 2024

Commercial real estate, owner-occupied	$	416	$	—	$	—	$	—	$	416	$	—
Commercial real estate, non-owner occupied	3,046		—		—		—		3,046		496

Home equity	—		473		—		—		473		—

Installment and other consumer	—		—		—		141		141		—
Total	$	3,462	$	473	$	—	$	141	$	4,076	$	496
December 31, 2023
Commercial and industrial	$	1,311	$	—	$	—	$	—	$	1,311	$	—
Commercial real estate, owner-occupied	434		—		—		—		434		—
Commercial real estate, non-owner occupied	3,081		—				—		3,081		408
Home equity	—		469		—		—		469		—




Total	$	4,826	$	469	$	—	$	—	$	5,295	$	408

1 There were no collateral-dependent residential real estate mortgage loans in process of foreclosure or in substance repossessed at March 31, 2024 and December 31, 2023. The weighted average loan-to-value of real estate secured collateral dependent loans was approximately 82% at March 31, 2024 and 70% at December 31, 2023.

Loan Modifications to Borrowers Experiencing Financial Difficulty

The following table summarizes the amortized cost of loans as of March 31, 2024 that were modified during the three months ended March 31, 2024 by portfolio class and type of modification granted. There were no modifications of loans during the three months ended March 31, 2023 requiring disclosure.


(in thousands)	Term Extension		Percent of Portfolio Class Total
Three months ended March 31, 2024
Commercial and industrial	$	2,191	1.5	%



Home equity	82		0.1	%


Total	$	2,273

As of March 31, 2024, there were no unfunded loan commitments for loans that were modified during the period presented.

The following table summarizes the financial effect of loan modifications presented in the table above during the three months ended March 31, 2024 by portfolio class.


(in thousands)									Weighted-Average Term Extension (in years)
Three months ended March 31, 2024
Commercial and industrial									0.3



Home equity									15.0

The loan modifications did not significantly impact the determination of the allowance for credit losses on loans during the three months ended March 31, 2024.

The Bank closely monitors the performance of the modified loans to understand the effectiveness of its modification efforts. The following table summarizes the amortized cost and payment status of loans as of March 31, 2024 that were modified during the three months ended March 31, 2024 by portfolio class.


(in thousands)	Current		30-59 Days Past Due		60-89 Days Past Due		90 Days or More Past Due		Total		Non-Accrual
Three months ended March 31, 2024
Commercial and industrial	$	2,191	$	—	$	—	$	—	$	2,191	$	2,191



Home equity	82		—		—		—		82		82


Total	$	2,273	$	—	$	—	$	—	$	2,273	$	2,273

There were no loans that defaulted (fully or partially charged-off or became 90 days or more past due) that were modified during the three months ended March 31, 2024.

Allocation of the Allowance for Credit Losses on Loans

The following table presents the details of the allowance for credit losses on loans segregated by loan portfolio class as of March 31, 2024 and December 31, 2023.


Allocation of the Allowance for Credit Losses on Loans
(in thousands)	Commercial and industrial		Commercial real estate, owner-occupied		Commercial real estate, non-owner occupied		Construction		Home equity		Other residential		Installment and other consumer		Unallocated		Total
March 31, 2024
Modeled expected credit losses	$	940	$	1,326	$	7,744	$	119	$	559	$	670	$	655	$	—	$	12,013
Qualitative adjustments	628		1,174		6,767		1,163		68		22		265		2,049		12,136
Specific allocations	159		—		1,193		—		—		—		—		—		1,352
Total	$	1,727	$	2,500	$	15,704	$	1,282	$	627	$	692	$	920	$	2,049	$	25,501
December 31, 2023
Modeled expected credit losses	$	897	$	1,270	$	7,380	$	185	$	482	$	619	$	634	$	—	$	11,467
Qualitative adjustments	622		1,205		6,327		1,647		70		33		342		2,038		12,284
Specific allocations	193		1		1,226		—		—		1		—		—		1,421
Total	$	1,712	$	2,476	$	14,933	$	1,832	$	552	$	653	$	976	$	2,038	$	25,172

Allowance for Credit Losses on Loans Rollforward

The following table discloses activity in the allowance for credit losses on loans for the periods presented.


Allowance for Credit Losses on Loans Rollforward
(in thousands)	Commercial and industrial		Commercial real estate, owner-occupied		Commercial real estate, non-owner occupied		Construction		Home equity		Other residential		Installment and other consumer		Unallocated		Total
Three months ended March 31, 2024
Beginning balance	$	1,712	$	2,476	$	14,933	$	1,832	$	552	$	653	$	976	$	2,038	$	25,172
(Reversal) Provision	19		24		771		(550)		75		39		(39)		11		350
(Charge-offs)	(4)		—		—		—		—		—		(17)		—		(21)
Recoveries	—		—		—		—		—		—		—		—		—
Ending balance	$	1,727	$	2,500	$	15,704	$	1,282	$	627	$	692	$	920	$	2,049	$	25,501
Three months ended March 31, 2023
Beginning balance	$	1,794	$	2,487	$	12,676	$	1,937	$	558	$	595	$	868	$	2,068	$	22,983
Provision (Reversal)	147		153		25		74		(20)		(18)		25		(36)		350

(Charge-offs)	(3)		—		—		—		—		—		(11)		—		(14)
Recoveries	3		—		—		8		—		—		—		—		11
Ending balance	$	1,941	$	2,640	$	12,701	$	2,019	$	538	$	577	$	882	$	2,032	$	23,330

Pledged Loans

Our FHLB line of credit is secured under terms of a blanket collateral agreement by a pledge of certain qualifying loans with unpaid principal balances of $1.299 billion and $1.288 billion at March 31, 2024 and December 31, 2023, respectively. In addition, we pledge eligible TIC loans, which totaled $108.5 million and $110.4 million at March 31, 2024 and December 31, 2023, respectively, to secure our borrowing capacity with the Federal Reserve Bank ("FRB"). For additional information, see Note 6, Borrowings.

Related Party Loans

The Bank has, and expects to have in the future, banking transactions in the ordinary course of its business with directors, officers, principal shareholders and their businesses or associates. These transactions, including loans, are granted on substantially the same terms, including interest rates and collateral on loans, as those prevailing at the same time for comparable transactions with persons not related to us. Likewise, these transactions do not involve more than the normal risk of collectability or present other unfavorable features.

The following table shows changes in net loans to related parties for each of the three years ended March 31, 2024.

Related party loans totaled $5.8 million as of both March 31, 2024 and December 31, 2023. In addition, undisbursed commitments to related parties totaled $212 thousand as of both March 31, 2024 and December 31, 2023.

Borrowings and Other Obligations

3 Months Ended

Mar. 31, 2024

Debt Disclosure [Abstract]

Borrowings and Other Obligations

Federal Home Loan Bank: The Bank had lines of credit with the FHLB totaling $951.2 million and $1.009 billion as of March 31, 2024 and December 31, 2023, respectively, based on eligible collateral of certain loans and investment securities.

Federal Funds Lines of Credit: The Bank had unsecured lines of credit with correspondent banks for overnight borrowings totaling $125.0 million and $135.0 million as of March 31, 2024 and December 31, 2023, respectively. In general, interest rates on these lines approximate the federal funds target rate.

Federal Reserve Bank: The Bank had a line of credit through the Discount Window at the Federal Reserve Bank of San Francisco ("FRBSF") totaling $350.0 million as of March 31, 2024, secured by investment securities and residential loans. As of December 31, 2023, the Bank had a line of credit through the Discount Window totaling $64.0 million, secured by residential loans, and a $270.2 million line under the Federal Reserve's temporary Bank Term Funding Program ("BTFP") based on the par values of pledged investment securities. When the BTFP program ended on March 11, 2024, the investment securities were used to collateralize borrowings through the Discount Window.

Other Obligations: Finance lease liabilities totaling $260 thousand and $298 thousand as of March 31, 2024 and December 31, 2023, respectively, are included in borrowings and other obligations in the consolidated statements of condition. Refer to Note 8, Commitments and Contingencies, for additional information.

The carrying values and weighted average interest rates on borrowings and other obligations as of March 31, 2024 and December 31, 2023 are summarized in the following table.


	March 31, 2024				December 31, 2023
(dollars in thousands)	Carrying Value		Weighted Average Rate		Carrying Value		Weighted Average Rate
FHLB short-term borrowings	$	—	—	%	$	—	—	%
Federal funds lines of credit	—		—	%	—		—	%
FRBSF federal funds purchased	—		—	%	—		—	%
FRBSF short-term borrowings under the BTFP	—		—	%	26,000		5.30	%
Other obligations (finance leases)	260		2.14	%	298		1.88	%
Total borrowings and other obligations	$	260	2.14	%	$	26,298	5.26	%

- Definition

The entire disclosure for information about short-term and long-term debt arrangements, which includes amounts of borrowings under each line of credit, note payable, commercial paper issue, bonds indenture, debenture issue, own-share lending arrangements and any other contractual agreement to repay funds, and about the underlying arrangements, rationale for a classification as long-term, including repayment terms, interest rates, collateral provided, restrictions on use of assets and activities, whether or not in compliance with debt covenants, and other matters important to users of the financial statements, such as the effects of refinancing and noncompliance with debt covenants.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 470
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 1B
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Reference 2: http://www.xbrl.org/2003/role/disclosureRef
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-Paragraph 1
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Reference 6: http://www.xbrl.org/2003/role/disclosureRef
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Reference 8: http://www.xbrl.org/2003/role/disclosureRef
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Reference 12: http://www.xbrl.org/2003/role/disclosureRef
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-URI https://asc.fasb.org//1943274/2147481139/470-20-50-1I

+ Details

Stockholders' Equity

3 Months Ended

Mar. 31, 2024

Equity [Abstract]

Stockholders' Equity

Dividends

On January 25, 2024, Bancorp declared a $0.25 per share cash dividend, paid February 15, 2024 to shareholders of record at the close of business on February 8, 2024. Subsequent to quarter end on April 25, 2024, Bancorp declared a $0.25 per share cash dividend, payable on May 16, 2024 to shareholders of record at the close of business on May 9, 2024.

Share-Based Payments

The fair value of stock options as of the grant date is recorded as stock-based compensation expense in the consolidated statements of comprehensive income over the requisite service period, which is generally the vesting period, with a corresponding increase in common stock. Stock-based compensation also includes compensation expense related to the issuance of restricted stock awards. The grant-date fair value of the restricted stock awards, which equals the grant date price, is recorded as compensation expense over the requisite service period with a corresponding increase in common stock as the shares vest. Stock options and restricted stock awards issued include a retirement eligibility clause whereby the requisite service period is satisfied at the retirement eligibility date. For those awards, we accelerate the recording of stock-based compensation when the award holder is eligible to retire. However, retirement eligibility does not affect the vesting of restricted stock or the exercisability of the stock options, which are based on the scheduled vesting period.

Performance-based stock awards (restricted stock) are issued to a selected group of employees. Stock award vesting is contingent upon the achievement of pre-established long-term performance goals set by the Compensation Committee of the Board of Directors. Performance is measured over a three-year period and cliff vested. These performance-based stock awards were granted at a maximum opportunity level, and based on the achievement of the pre-established goals, the actual payouts can range from 0% to 200% of the target award. For performance-based stock awards, an estimate is made of the number of shares expected to vest based on the probability that the performance criteria will be achieved to determine the amount of compensation expense to be recognized. The estimate is re-evaluated quarterly and total compensation expense is adjusted for any change in the current period.

We record excess tax benefits (deficiencies) resulting from the exercise of non-qualified stock options, the disqualifying disposition of incentive stock options and vesting of restricted stock awards as income tax benefits (expense) in the consolidated statements of comprehensive income with a corresponding decrease (increase) to current taxes payable.

The holders of unvested restricted stock awards are entitled to dividends on the same per-share ratio as holders of common stock. Tax benefits for dividends paid on unvested restricted stock awards are recorded as tax benefits in the consolidated statements of comprehensive income with a corresponding decrease to current taxes payable. Dividends on forfeited awards are included in stock-based compensation expense.

Stock options and restricted stock may be net settled in a cashless exercise by a reduction in the number of shares otherwise deliverable upon exercise or vesting in satisfaction of the exercise payment and/or applicable tax withholding requirements. Shares withheld under net settlement arrangements are available for future grants. The table below depicts the total number of shares, amount, and weighted average price withheld for cashless exercises for the periods presented.


	Three Months Ended
	March 31, 2024		March 31, 2023
Number of shares withheld	3,338		2,847
Total amount withheld (in thousands)	$	55	$	82
Weighted-average price	$	16.62	$	28.74

Share Repurchase Program

On July 21, 2023, the Board of Directors approved the adoption of Bancorp's new share repurchase program for up to $25.0 million and expiring on July 31, 2025. There have been no repurchases to date in 2024 or in 2023.

- Definition

The entire disclosure for equity.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 505
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-Name Accounting Standards Codification
-Section 50
-Paragraph 13
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-Publisher FASB
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Reference 2: http://www.xbrl.org/2003/role/disclosureRef
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Reference 6: http://www.xbrl.org/2003/role/disclosureRef
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Reference 7: http://www.xbrl.org/2003/role/disclosureRef
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Reference 8: http://www.xbrl.org/2003/role/disclosureRef
-Topic 505
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-Paragraph 1
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Reference 9: http://www.xbrl.org/2003/role/disclosureRef
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Reference 11: http://www.xbrl.org/2003/role/disclosureRef
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Reference 13: http://www.xbrl.org/2003/role/disclosureRef
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Reference 14: http://www.xbrl.org/2003/role/disclosureRef
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Reference 15: http://www.xbrl.org/2003/role/disclosureRef
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Reference 16: http://www.xbrl.org/2003/role/disclosureRef
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Reference 17: http://www.xbrl.org/2003/role/disclosureRef
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Reference 18: http://www.xbrl.org/2003/role/disclosureRef
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Reference 19: http://www.xbrl.org/2003/role/disclosureRef
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+ Details

Commitments and Contingent Liabilities

3 Months Ended

Mar. 31, 2024

Commitments and Contingencies Disclosure [Abstract]

Commitments and Contingent Liabilities

Financial Instruments with Off-Balance Sheet Risk

We make commitments to extend credit in the normal course of business to meet the financing needs of our customers. These financial instruments include commitments to extend credit in the form of loans or through standby letters of credit. 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. Commitments generally have fixed expiration dates or other termination clauses and may require payment of a fee. Because various commitments will expire without being fully drawn, the total commitment amount does not necessarily represent future cash requirements.

Our credit loss exposure is equal to the contractual amount of the commitment in the event of nonperformance by the borrower. We use the same credit underwriting criteria for all credit exposure. The amount of collateral obtained, if deemed necessary by us, is based on management's credit evaluation of the borrower. Collateral types pledged may include accounts receivable, inventory, other personal property and real property.

The contractual amount of unfunded loan commitments and standby letters of credit not reflected in the consolidated statements of condition are as follows:


(in thousands)	March 31, 2024		December 31, 2023
Commercial lines of credit	$	250,602	$	259,989
Revolving home equity lines	216,387		218,935
Undisbursed construction loans	10,176		13,943
Personal and other lines of credit	9,132		9,136
Standby letters of credit	3,147		3,147
Total unfunded loan commitments and standby letters of credit	$	489,444	$	505,150

We record an allowance for credit losses on unfunded loan commitments at the balance sheet date based on estimates of the probability that these commitments will be drawn upon according to historical utilization experience of the different types of commitments and expected loss rates determined for pooled funded loans. The allowance for credit losses on unfunded commitments totaled $1.1 million at both March 31, 2024 and December 31, 2023, which is included in interest payable and other liabilities in the consolidated statements of condition. There was no provision for credit losses on unfunded loan commitments in the first quarter of 2024. The $174 thousand reversal of the provision for credit losses on unfunded loan commitments in the first quarter of 2023 was due primarily to a $37.4 million decrease in total unfunded commitments.

Leases

We lease premises under long-term non-cancelable operating leases with remaining terms of 30 days to 18 years, 5 months, most of which include escalation clauses and one or more options to extend the lease term, and some of

which contain lease termination clauses. Lease terms may include certain renewal options that were considered reasonably certain to be exercised.

We lease certain equipment under finance leases with initial terms of 3 years to 5 years. The equipment finance leases do not contain renewal options, bargain purchase options or residual value guarantees.

The following table shows the balances of operating and finance lease right-of-use assets and lease liabilities.


(in thousands)	March 31, 2024		December 31, 2023
Operating leases:
Operating lease right-of-use assets	$	21,553	$	20,316
Operating lease liabilities	$	24,150	$	22,906
Finance leases:
Finance lease right-of-use assets	$	608	$	608
Accumulated amortization	(356)		(319)
Finance lease right-of-use assets, net1	$	252	$	289
Finance lease liabilities 2	$	260	$	298
1 Included in premises and equipment in the consolidated statements of condition.
2 Included in borrowings and other obligations in the consolidated statements of condition.

The following table shows supplemental disclosures of noncash investing and financing activities for the periods presented.


	Three months ended
(in thousands)	March 31, 2024		March 31, 2023
Right-of-use assets obtained in exchange for operating lease liabilities	$	2,417	$	—

The following table shows components of operating and finance lease cost.


	Three months ended
(in thousands)	March 31, 2024		March 31, 2023
Operating lease cost 1	$	1,318	$	1,610


Finance lease cost:
Amortization of right-of-use assets 2	$	37	$	37
Interest on finance lease liabilities 3	1		2
Total finance lease cost	$	38	$	39
Total lease cost	$	1,356	$	1,649
1 Included in occupancy and equipment expense in the consolidated statements of comprehensive income.
2 Included in depreciation and amortization in the consolidated statements of comprehensive income.
3 Included in interest on borrowings and other obligations in the consolidated statements of comprehensive income.

The following table shows the future minimum lease payments, weighted average remaining lease terms, and weighted average discount rates under operating and finance lease arrangements as of March 31, 2024. The discount rates used to calculate the present value of lease liabilities were based on the collateralized FHLB borrowing rates that were commensurate with lease terms and minimum payments on the lease commencement date.


(in thousands)	March 31, 2024
Year	Operating Leases			Finance Leases
2024	$	3,630		$	117
2025	4,295			108
2026	3,561			37
2027	3,291			5
2028	2,910			—
Thereafter	9,856			—
Total minimum lease payments	27,543			267
Amounts representing interest (present value discount)	(3,393)			(7)
Present value of net minimum lease payments (lease liability)	$	24,150		$	260
Weighted average remaining term (in years)	8.0			2.0
Weighted average discount rate	2.72		%	2.14		%

Litigation Matters

Bancorp may be party to legal actions that arise from time to time in the normal course of business. Bancorp's management is not aware of any pending legal proceedings to which either it or the Bank may be a party or has recently been a party that will have a material adverse effect on the financial condition or results of operations of Bancorp or the Bank.

The Bank is responsible for a proportionate share of certain litigation indemnifications provided to Visa U.S.A. ("Visa") by its member banks in connection with Visa's lawsuits related to anti-trust charges and interchange fees ("Covered Litigation"). We sold our remaining shares on July 13, 2023, however our proportionate share of the litigation indemnification liability does not change or transfer upon the sale of our Class B Visa shares to member banks or, per the terms of the sale, to the recent purchaser of our shares. Visa established an escrow account for the Covered Litigation that it periodically funds, which is expected to cover the settlement payment obligations.

Litigation is ongoing and until the court approval process is complete, there is no assurance that Visa will resolve the claims as contemplated by the amended class settlement agreement, and additional lawsuits may arise from individual merchants who opted out of the class settlement. However, until the escrow account is fully depleted and the conversion rate of Class B to Class A common stock is reduced to zero, no future cash settlement payments are required by the member banks, such as us, on the Covered Litigation. Therefore, we are not required to record any contingent liabilities for the indemnification related to the Covered Litigation, as we consider the probability of losses to be remote.

Derivative Financial Instruments and Hedging Activities

3 Months Ended

Mar. 31, 2024

Derivative Instruments and Hedging Activities Disclosure [Abstract]

Derivative Financial Instruments and Hedging Activities

The Bank is exposed to certain risks from both its business operations and changes in economic conditions. As part of our asset/liability and interest rate risk management strategy, we may enter into interest rate derivative contracts to modify repricing characteristics of certain of our interest-earning assets and interest-bearing liabilities. The Bank generally designates interest rate hedging agreements utilized in the management of interest rate risk as either fair value hedges or cash flow hedges.

Our credit exposure, if any, on interest rate swap asset positions is limited to the fair value (net of any collateral pledged to us) and interest payments of all swaps by each counterparty. Conversely, when an interest rate swap is in a liability position exceeding a certain threshold, we may be required to post collateral to the counterparty in an amount determined by the agreements. Collateral levels are monitored and adjusted on a regular basis for changes in interest rate swap values.

On July 7, 2023, the Bank entered into various interest rate swap agreements with notional values totaling $101.8 million split evenly between terms of 2.5 and 3.0 years to hedge balance sheet interest rate sensitivity and protect certain of our fixed rate available-for-sale securities against changes in fair value related to changes in the benchmark interest rate. The interest rate swaps involve the receipt of floating rate interest from a counterparty in exchange for us making fixed-rate interest payments over the lives of the agreements, without the exchange of the underlying notional values. The transactions were designated as partial term fair value hedges and structured such that the changes in the fair value of the interest rate swaps are expected to be perfectly effective in offsetting the changes in the fair value of the hedged items attributable to changes in the SOFR OIS swap rate, the designated benchmark interest rate. Because the hedges met the criteria for using the shortcut method, there is no need to periodically reassess effectiveness during the term of the hedges. For fair value designated hedges, the gains or losses on the hedging instruments as well as the offsetting loss or gain on the hedged items, are recognized in current earnings as their fair values change.

In addition, we had three interest rate swap agreements on certain loans with our customers, which are scheduled to mature at various dates ranging from June 2031 to July 2032. In December 2023, one interest rate swap, scheduled to mature in October 2037, was terminated as the hedged loan was paid off. The loan interest rate swaps were designated as fair value hedges and allowed us to offer long-term fixed-rate loans to customers without assuming the interest rate risk of a long-term asset. Converting our fixed-rate interest payments to floating-rate interest payments, generally benchmarked to the one-month U.S. dollar SOFR index, protects us against changes in the fair value of our loans associated with fluctuating interest rates. The notional amounts of the interest rate contracts are equal to the notional amounts of the hedged loans.

Information on our derivatives follows:


	Asset derivatives				Liability derivatives
(in thousands)	March 31, 2024		December 31, 2023		March 31, 2024		December 31, 2023
Available-for-sale securities:
Interest rate swaps - notional amount	$	—	$	—	$	101,770	$	101,770
Interest rate swaps - fair value1	$	—	$	—	$	142	$	1,359
Loans receivable:
Interest rate contracts - notional amount	$	8,366	$	6,441	$	—	$	2,157
Interest rate contracts - fair value1	$	400	$	287	$	—	$	2

1 Refer to Note 3, Fair Value of Assets and Liabilities, for valuation methodology.

The following table presents the carrying amount and associated cumulative basis adjustment related to the application of fair value hedge accounting that is included in the carrying amount of hedged assets as of March 31, 2024 and December 31, 2023.


	Carrying Amounts of Hedged Assets				Cumulative Amounts of Fair Value Hedging Adjustments Included in the Carrying Amounts of the Hedged Assets
(in thousands)	March 31, 2024		December 31, 2023		March 31, 2024		December 31, 2023
Available-for-sale securities 1	$	108,125	$	107,181	$	(142)	$	(1,359)
Loans receivable 2	$	7,841	$	8,183	$	(478)	$	(367)
1 Carrying value equals the amortized cost basis of the securities underlying the hedge relationship, which is the book value net of the fair value hedge adjustment. Amortized cost excludes accrued interest totaling $233 thousand and $222 thousand as of March 31, 2024 and December 31, 2023, respectively.
2 Carrying value equals the amortized cost basis of the loans underlying the hedge relationship, which is the loan balance net of deferred loan origination fees and cost and the fair value hedge adjustment. Amortized cost excludes accrued interest, which was not material.

The following table presents the pretax net gains (losses) recognized in interest income related to our fair value hedges for the years presented.


	Three months ended
(in thousands)	March 31, 2024		March 31, 2023
Interest on investment securities 1
Increase in fair value of interest rate swaps hedging available-for-sale securities	$	1,217	$	—
Hedged interest earned	206		—
Decrease in carrying value included in the hedged available-for-sale securities	(1,217)		—
Net gain (loss) recognized in interest income on investment securities	$	206	$	—
Interest and fees on loans 1
Increase (decrease) in fair value of interest rate swaps hedging loans receivable	$	115	$	(221)
Hedged interest earned	54		51
(Decrease) increase in carrying value included in the hedged loans	(110)		221
Decrease in value of yield maintenance agreement	(2)		(2)
Net gain recognized in interest income on loans	$	57	$	49
1 Represents the income line item in the statement of comprehensive income in which the effects of fair value hedges are recorded.

Our derivative transactions with the counterparty are under an International Swaps and Derivative Association (“ISDA”) master agreement that includes “right of set-off” provisions. “Right of set-off” provisions are legally enforceable rights to offset recognized amounts and there may be an intention to settle such amounts on a net basis. We do not offset such financial instruments for financial reporting purposes. Information on financial instruments that are eligible for offset in the consolidated statements of condition follows:


Offsetting of Financial Assets and Derivative Assets
			Gross Amounts		Net Amounts of		Gross Amounts Not Offset in
	Gross Amounts		Offset in the		Assets Presented		the Statements of Condition
	of Recognized		Statements of		in the Statements		Financial		Cash Collateral
(in thousands)	Assets1		Condition		of Condition1		Instruments		Received		Net Amount
March 31, 2024

Counterparty	$	400	$	—	$	400	$	—	$	—	$	400
Total	$	400	$	—	$	400	$	—	$	—	$	400
December 31, 2023

Counterparty	$	287	$	—	$	287	$	—	$	—	$	287
Total	$	287	$	—	$	287	$	—	$	—	$	287



Offsetting of Financial Liabilities and Derivative Liabilities
			Gross Amounts		Net Amounts of		Gross Amounts Not Offset in
	Gross Amounts		Offset in the		Assets Presented		the Statements of Condition
	of Recognized		Statements of		in the Statements		Financial		Cash Collateral
(in thousands)	Assets1		Condition		of Condition1		Instruments		Received		Net Amount
March 31, 2024

Counterparty	142		—		142		(142)		—		—
Total	$	142	$	—	$	142	$	(142)	$	—	$	—
December 31, 2023
Counterparty	$	1,361	$	—	$	1,361	$	(287)	$	(330)	$	744

Total	$	1,361	$	—	$	1,361	$	(287)	$	(330)	$	744

1 Amounts exclude accrued interest on swaps.

For more information on how we account for our interest rate swaps, refer to Note 1 to the Consolidated Financial Statements included in our 2023 Form 10-K filed with the SEC on March 14, 2024.

Basis of Presentation (Policies)	3 Months Ended
Basis of Presentation (Policies)	Mar. 31, 2024
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Basis of Presentation	The consolidated financial statements include the accounts of Bancorp, a bank holding company, and its wholly-owned bank subsidiary, Bank of Marin, a California state-chartered commercial bank. References to “we,” “our,” “us” mean Bancorp and the Bank that are consolidated for financial reporting purposes. The accompanying unaudited consolidated interim financial statements have been prepared pursuant to the rules and regulations of the Securities and Exchange Commission ("SEC"). Certain information and note disclosures normally included in annual financial statements prepared in accordance with U.S. generally accepted accounting principles ("GAAP") have been condensed or omitted pursuant to those rules and regulations. Although we believe that the disclosures are adequate and the information presented is not misleading, we suggest that these interim financial statements be read in conjunction with the annual financial statements and the notes thereto included in our 2023 Annual Report on Form 10-K. In the opinion of management, the unaudited consolidated financial statements reflect all adjustments, which are necessary for a fair presentation of the consolidated financial position, the results of operations, changes in comprehensive income (loss), changes in stockholders’ equity, and cash flows for the periods presented. All material intercompany transactions have been eliminated. The results of these interim periods may not be indicative of the results for the full year or for any other period.
Earnings Per Share	Basic earnings per share (“EPS”) are calculated by dividing net income by the weighted average number of common shares outstanding during each period, excluding unvested restricted stock awards. Diluted EPS are calculated using the weighted average number of potentially dilutive common shares. The number of potentially dilutive common shares included in the quarterly diluted EPS is computed using the average market prices during the three months included in the reporting period under the treasury stock method. The number of potentially dilutive common shares included in year-to-date diluted EPS is a year-to-date weighted average of potentially dilutive common shares included in each quarterly diluted EPS computation. In computing diluted EPS, we exclude anti-dilutive shares such as options whose exercise prices exceed the current common stock price, as they would not reduce EPS under the treasury stock method. We have two forms of outstanding common stock: common stock and unvested restricted stock awards. Holders of unvested restricted stock awards receive non-forfeitable dividends at the same rate as common shareholders and they both share equally in undistributed earnings. Under the two-class method, the difference in EPS is nominal for these participating securities.
Recently Adopted and Issued Accounting Standards	Recently Adopted and Issued Accounting Standards Accounting Standards Adopted in 2024 In June 2022, the FASB issued ASU No. 2022-03, Fair Value Measurement (Topic 820): Fair Value Measurement of Equity Securities Subject to Contractual Sale Restrictions. The amendment reduces diversity in practice by clarifying that a separate contractual restriction on the sale of an equity security is not considered part of the unit of account of the equity security and, therefore, is not considered in measuring fair value. In addition, this ASU provided amended examples to illustrate that a restriction that is a characteristic of the equity security, which market participants would take into account when pricing them, would be considered in measuring fair value. This ASU also introduced new disclosure requirements. The amendments were effective prospectively for years beginning after December 15, 2023. As discussed in Note 4, Investment Securities, in 2023 we sold our remaining shares of Visa Inc. Class B restricted common stock. As a result of the sale, this update had no impact our financial condition, results of operations or disclosures. In March 2023, the FASB issued ASU No. 2023-01, Leases (Topic 842): Common Control Arrangements. For public companies, the amendment requires entities to amortize leasehold improvements associated with common control lease arrangements over the useful life of the improvements to the common control group, as opposed to the shorter of the remaining lease term and the useful life of the improvements for all other operating leases. The amendments were effective for years beginning after December 15, 2023, and may be adopted either prospectively or retrospectively. We currently do not have common control lease arrangements, and therefore the adoption of the amendments had no impact on our financial condition, results of operations or disclosures. In March 2023, the FASB issued ASU No. 2023-02, Investments—Equity Method and Joint Ventures (Topic 323): Accounting for Investments in Tax Credit Structures Using the Proportional Amortization Method. Under current GAAP, an entity can only elect to apply the proportional amortization method to investments in low-income housing tax credit ("LIHTC") structures. The proportional amortization method results in the cost of the investment being amortized in proportion to the income tax credits and other income tax benefits received, with the amortization of the investment and the income tax credits being presented net in the consolidated statements of income as a component of income tax expense (benefit). The amendments will allow entities to elect to account for all other equity investments made primarily for the purpose of receiving income tax credits to using the proportional amortization method, regardless of the tax credit program through which the investment earns income tax credits, when certain conditions are met. The amendments were effective for fiscal years beginning after December 15, 2023, and may be adopted either on a modified retrospective basis or retrospectively. Other than investments in LIHTC funds, as disclosed in Note 4, Investment Securities, we currently have no other equity investments made primarily for the purpose of receiving income tax credits, and therefore the adoption of this ASU had no impact on our financial condition, results of operations or disclosures. Accounting Standards Not Yet Effective In November 2023, the FASB issued ASU No. 2023-07, Segment Reporting (Topic 280): Improvements to Reportable Segment Disclosures. The amendments are intended to improve reportable segment disclosure requirements, primarily through enhanced disclosures about significant segment expenses, enhanced interim disclosure requirements, clarifying circumstances in which an entity can disclose multiple segment measures of profit or loss, providing new segment disclosure requirements for entities with a single reportable segment, and requiring other disclosures. The amendments are effective for annual reporting periods beginning after December 15, 2023 (i.e., 2024 Form 10-K) and interim periods within fiscal years beginning after December 31, 2024, and shall be applied retrospectively to all prior periods presented in the financial statements. Early adoption is permitted. We currently have only one reportable segment and are evaluating the impact the amendments will have on our financial statement disclosures upon adoption. In December 2023, the FASB issued ASU No. 2023-09, Income Taxes (Topic 740): Improvements to Income Tax Disclosures. The amendments require disaggregated information about the effective tax rate reconciliation and additional disclosures on reconciling items and taxes paid that meet a quantitative threshold. The amendments are effective for annual reporting periods beginning after December 15, 2024, and may be adopted either prospectively or retrospectively. Early adoption is permitted. We are currently evaluating the impact of the amendments on our financial statement disclosures upon adoption.
Fair Value Hierarchy and Fair Value Measurement	We group our assets and liabilities that are measured at fair value into three levels within the fair value hierarchy, based on the markets in which the assets and liabilities are traded and the reliability of the assumptions used to determine fair value. These levels are: Level 1: Valuations are based on unadjusted quoted prices in active markets for identical assets or liabilities. Level 2: Valuations are based on quoted prices for similar instruments in active markets, quoted prices for identical or similar instruments in markets that are not active and model-based valuations for which all significant assumptions are observable or can be corroborated by observable market data. Level 3: Valuations are based on unobservable inputs that are supported by little or no market activity and that are significant to the fair value of the assets or liabilities. Values are determined using pricing models and discounted cash flow models and may include significant management judgment and estimation. Transfers between levels of the fair value hierarchy are recognized through our monthly and/or quarterly valuation process in the reporting period during which the event or circumstances that caused the transfer occurred. No such transfers occurred in the years presented. Available-for-sale securities are recorded at fair value on a recurring basis. When available, quoted market prices (Level 1) are used to determine the fair value of available-for-sale securities. Level 1 securities include U.S. Treasury securities. If quoted market prices are not available, we obtain pricing information from a reputable third-party service provider, who may utilize valuation techniques that use current market-based or independently sourced parameters, such as bid/ask prices, dealer-quoted prices, interest rates, benchmark yield curves, prepayment speeds, probability of default, loss severity and credit spreads (Level 2). Level 2 securities include obligations of state and political subdivisions, U.S. agencies or government-sponsored agencies' debt securities, mortgage-backed securities, government agency-issued securities, and corporate bonds.Held-to-maturity securities may be subject to an allowance for credit losses as a result of our evaluation of expected losses due to credit quality factors. Fair value of held-to-maturity securities is determined using the same techniques discussed above for available-for-sale securities. On a recurring basis, derivative financial instruments are recorded at fair value, which is based on the income approach using observable Level 2 market inputs, reflecting market expectations of future interest rates as of the measurement date. Standard valuation techniques are used to calculate the present value of the future expected cash flows assuming an orderly transaction. Valuation adjustments may be made to reflect both our own credit risk and the counterparties’ credit risk in determining the fair value of the derivatives. These unobservable inputs are not considered significant inputs to the fair value measurement overall. Level 2 inputs for the valuations are limited to observable market prices for Secured Overnight Financing Rate ("SOFR") and Overnight Index Swap ("OIS") rates (for the very short term), quoted prices for SOFR futures contracts, observable market prices for SOFR and OIS swap rates, and one-month and three-month SOFR basis spreads at commonly quoted intervals. Mid-market pricing of the inputs is used as a practical expedient in the fair value measurements. We project spot rates at reset days specified by each swap contract to determine future cash flows, then discount to present value using OIS curves as of the measurement date. When the value of any collateral placed with counterparties is less than the interest rate derivative liability, a credit valuation adjustment ("CVA") is applied to reflect the credit risk we pose to counterparties. We have used the spread between the Standard & Poor's BBB rated U.S. Bank Composite rate and SOFR for the closest maturity term corresponding to the duration of the swaps to derive the CVA. Because there is little to no counterparty risk, we did not incorporate credit adjustments from our assessment of the counterparty credit risk in determining fair value. For further discussion on our methodology for valuing our derivative financial instruments, refer to Note 9, Derivative Financial Instruments and Hedging Activities. Certain financial assets may be measured at fair value on a non-recurring basis. These assets are subject to fair value adjustments that result from the application of the lower of cost or fair value accounting or write-downs of individual assets, such as individually analyzed loans that are collateral dependent and other real estate owned ("OREO"). The fair value of loans is based on exit price techniques and obtained from an independent third-party that uses its proprietary valuation model and methodology and may differ from the actual price from a prospective buyer. The discounted cash flow valuation approach reflects key inputs and assumptions that are unobservable, such as loan probability of default, loss given default, prepayment speed, and market discount rates. The fair value of fixed-rate time deposits is estimated by discounting future contractual cash flows using discount rates that reflect the current observable market rates offered for time deposits of similar remaining maturities. The value of off-balance-sheet financial instruments is estimated based on the fee income associated with the commitments, which in the absence of credit exposure, is considered to approximate their settlement value.
Finance, Loan and Lease Receivables, Held-for-investment, Allowance and Nonperforming Loans	Commercial and Industrial Loans - Commercial loans are generally made to established small and mid-sized businesses to provide financing for their growth and working capital needs, equipment purchases and acquisitions. Management examines historical, current, and projected cash flows to determine the ability of the borrower to repay obligations as agreed. Commercial loans are made based primarily on the identified cash flows of the borrower and secondarily on the underlying collateral and guarantor support. The cash flows of borrowers, however, may not occur as expected, and the collateral securing these loans may fluctuate in value. Most commercial and industrial loans are secured by the assets being financed, such as accounts receivable and inventory, and typically include personal guarantees. We target stable businesses with guarantors who provide additional sources of repayment and have proven to be resilient in periods of economic stress. A weakened economy, and resultant decreased consumer and/or business spending, may have an effect on the credit quality of commercial loans. Commercial Real Estate Loans - Commercial real estate loans, which include income producing investment properties and owner-occupied real estate used for business purposes, are subject to underwriting standards and processes similar to commercial loans discussed above. We underwrite these loans to be repaid from cash flow from either the business or investment property and supported by real property collateral. Underwriting standards for commercial real estate loans include, but are not limited to, debt coverage and loan-to-value ratios. Furthermore, a large majority of our loans are guaranteed by the owners of the properties. Conditions in the real estate markets or downturn in the general economy may adversely affect our commercial real estate loans. In the event of a vacancy, we expect guarantors to carry the loans until they find a replacement tenant. The owner's substantial equity investment provides a strong economic incentive to continue to support the commercial real estate projects. As such, we have generally experienced a relatively low level of loss and delinquencies in this portfolio. Construction Loans - Construction loans are generally made to developers and builders to finance construction, renovation and occasionally land acquisitions in anticipation of near-term development. Construction loans include interest reserves that are used for the payment of interest during the development and marketing periods and are capitalized as part of the loan balance. When a construction loan is placed on nonaccrual status before the depletion of the interest reserve, we apply the interest funded by the interest reserve against the loan's principal balance. These loans are underwritten after evaluation of the borrower's financial strength, reputation, prior track record, and independent appraisals. We monitor all construction projects to determine whether they are on schedule, completed as planned and in accordance with the approved construction budgets. Significant events can affect the construction industry, including: the inherent volatility of real estate markets and vulnerability to delays due to weather, change orders, inability to obtain construction permits, labor or material shortages, and price changes. Estimates of construction costs and value associated with the completed project may be inaccurate. Repayment of construction loans is largely dependent on the ultimate success of the project. Consumer Loans - Consumer loans primarily consist of home equity lines of credit, other residential loans, floating homes, and indirect luxury auto loans, along with a small number of installment loans. Our other residential loans include tenancy-in-common fractional interest loans ("TIC") located almost entirely in San Francisco County. We originate consumer loans utilizing credit score information, debt-to-income ratio and loan-to-value ratio analysis. Diversification among consumer loan types, coupled with relatively small loan amounts that are spread across many individual borrowers, mitigates risk. We do not originate sub-prime residential mortgage loans, nor is it our practice to underwrite loans commonly referred to as "Alt-A mortgages," the characteristics of which are reduced documentation, borrowers with low FICO scores or collateral with high loan-to-value ratios. Credit Quality Indicators We use a risk rating system to evaluate asset quality, and to identify and monitor credit risk in individual loans, and in the loan portfolio. Our definitions of “Special Mention” risk graded loans, or worse, are consistent with those used by the Federal Deposit Insurance Corporation ("FDIC"). Our internally assigned grades are as follows: Pass and Watch - Loans to borrowers of acceptable or better credit quality. Borrowers in this category demonstrate fundamentally sound financial positions, repayment capacity, credit history and management expertise. Loans in this category must have an identifiable and stable source of repayment and meet the Bank’s policy regarding debt-service-coverage ratios. These borrowers are capable of sustaining normal economic, market or operational setbacks without significant financial consequences. Negative external industry factors are generally not present. The loan may be secured, unsecured or supported by non-real estate collateral for which the value is more difficult to determine and/or marketability is more uncertain. This category also includes “Watch” loans, where the primary source of repayment has been delayed. “Watch” is intended to be a transitional grade, with either an upgrade or downgrade within a reasonable period. Special Mention - Potential weaknesses that deserve close attention. If left uncorrected, those potential weaknesses may result in deterioration of the payment prospects for the asset. Special Mention assets do not present sufficient risk to warrant adverse classification. Substandard - Inadequately protected by either the current sound worth and paying capacity of the obligor or the collateral pledged, if any. A Substandard asset has well-defined weaknesses that jeopardize the liquidation of the debt. Substandard assets are characterized by the distinct possibility that we will sustain some loss if such weaknesses or deficiencies are not corrected. Well-defined weaknesses include adverse trends or developments of the borrower’s financial condition, managerial weaknesses and/or significant collateral deficiencies. Doubtful - Critical weaknesses that make collection or liquidation in full improbable. There may be specific pending events that work to strengthen the asset; however, the amount or timing of the loss may not be determinable. Pending events generally occur within one year of the asset being classified as Doubtful. Examples include: merger, acquisition, or liquidation; capital injection; guarantee; perfecting liens on additional collateral; and refinancing. Such loans are placed on non-accrual status and usually are collateral-dependent. We regularly review our credits for accuracy of risk grades whenever we receive new information and at each quarterly and year-end reporting period. Borrowers are generally required to submit financial information at regular intervals. Typically, commercial borrowers with lines of credit are required to submit financial information with reporting intervals ranging from monthly to annually depending on credit size, risk and complexity. In addition, investor commercial real estate borrowers with loans exceeding a certain dollar threshold are usually required to submit rent rolls or property income statements annually. We monitor construction loans monthly. We review home equity and other consumer loans based on delinquency. We also review loans graded “Watch” or worse, regardless of loan type, no less than quarterly.

- Definition

Describes an entity's accounting policy and methodology for estimating its allowance for loan and lease losses, and its accounting policy for nonperforming loans. The description identifies the factors that influenced management of the entity in establishing the level of the allowance (for example, historical losses and existing economic conditions) and also may include discussion of the risk elements relevant to particular categories of receivables. The disclosure also may describe any liability the entity has recorded for off-balance sheet credit losses and may include the basis for determining each element of the allowance for loan and lease losses. The disclosure also could discuss the entity's policy for (1) placing loans on nonaccrual status (or discontinuing accrual of interest) and recording payments received on nonaccrual loans, and the policy for resuming accrual of interest, (2) charging-off uncollectible loans, and (3) determining past due or delinquency status (that is, whether past due status is based on how recently payments have been received or contractual terms).

+ References + Details

Basis of Presentation (Tables)

3 Months Ended

Mar. 31, 2024

Organization, Consolidation and Presentation of Financial Statements [Abstract]

Schedule of Earnings Per Share Reconciliation

The following table shows: 1) weighted average basic shares, 2) potentially dilutive weighted average common shares related to stock options and unvested restricted stock awards, and 3) weighted average diluted shares. Basic earnings per share (“EPS”) are calculated by dividing net income by the weighted average number of common shares outstanding during each period, excluding unvested restricted stock awards. Diluted EPS are calculated using the weighted average number of potentially dilutive common shares. The number of potentially dilutive common shares included in the quarterly diluted EPS is computed using the average market prices during the three months included in the reporting period under the treasury stock method. The number of potentially dilutive common shares included in year-to-date diluted EPS is a year-to-date weighted average of potentially dilutive common shares included in each quarterly diluted EPS computation. In computing diluted EPS, we exclude anti-dilutive shares such as options whose exercise prices exceed the current common stock price, as they would not reduce EPS under the treasury stock method. We have two forms of outstanding common stock: common stock and unvested restricted stock awards. Holders of unvested restricted stock awards receive non-forfeitable dividends at the same rate as common shareholders and they both share equally in undistributed earnings. Under the two-class method, the difference in EPS is nominal for these participating securities.


	Three months ended
(in thousands, except per share data)	March 31, 2024		March 31, 2023
Weighted average basic common shares outstanding	16,081		15,970
Potentially dilutive common shares related to:
Stock options	—		14
Unvested restricted stock awards	11		15
Weighted average diluted common shares outstanding	16,092		15,999
Net income	$	2,922	$	9,440
Basic EPS	$	0.18	$	0.59
Diluted EPS	$	0.18	$	0.59
Weighted average anti-dilutive common shares not included in the calculation of diluted EPS	340		250

Fair Value of Assets and Liabilities (Tables)

3 Months Ended

Mar. 31, 2024

Fair Value Disclosures [Abstract]

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

The following table summarizes our assets and liabilities that were required to be recorded at fair value on a recurring basis.


(in thousands) Description of Financial Instruments	Carrying Value		Quoted Prices in Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)		Measurement Categories: Changes in Fair Value Recorded In1
March 31, 2024
Securities available-for-sale:
Mortgage-backed securities and collateralized mortgage obligations issued by U.S. government-sponsored agencies	$	340,908	$	—	$	340,908	$	—	OCI
SBA-backed securities	$	17,148	$	—	$	17,148	$	—	OCI
Debentures of government sponsored agencies	$	66,688	$	—	$	66,688	$	—	OCI
U.S. Treasury securities	$	10,534	$	10,534	$	—	$	—	OCI

Obligations of state and political subdivisions	$	90,343	$	—	$	90,343	$	—	OCI
Corporate bonds	$	10,744	$	—	$	10,744	$	—	OCI

Derivative financial assets (interest rate contracts)	$	400	$	—	$	400	$	—	NI
Derivative financial liabilities (interest rate contracts)	$	142	$	—	$	142	$	—	NI
December 31, 2023
Securities available-for-sale:
Mortgage-backed securities and collateralized mortgage obligations issued by U.S. government-sponsored agencies	$	352,472	$	—	$	352,472	$	—	OCI
SBA-backed securities	$	19,471	$	—	$	19,471	$	—	OCI
Debentures of government sponsored agencies	$	66,862	$	—	$	66,862	$	—	OCI
U.S. Treasury securities	$	10,623	$	10,623	$	—	$	—	OCI

Obligations of state and political subdivisions	$	91,882	$	—	$	91,882	$	—	OCI
Corporate bonds	$	10,718	$	—	$	10,718	$	—	OCI

Derivative financial assets (interest rate contracts)	$	287	$	—	$	287	$	—	NI
Derivative financial liabilities (interest rate contracts)	$	1,361	$	—	$	1,361	$	—	NI

1 Other comprehensive income ("OCI") or net income ("NI").

Schedule of Fair Value of Financial Instruments

The table below is a summary of fair value estimates for financial instruments as of March 31, 2024 and December 31, 2023, excluding financial instruments recorded at fair value on a recurring basis (summarized in the first table in this note). The carrying amounts in the following table are recorded in the consolidated statements of condition under the indicated captions. Further, we have not disclosed the fair value of financial instruments specifically excluded from disclosure requirements such as bank-owned life insurance policies ("BOLI"), lease obligations and non-maturity deposit liabilities. Additionally, we held shares of Federal Home Loan Bank ("FHLB") of San Francisco stock at cost as of March 31, 2024 and December 31, 2023. There were no impairments or changes resulting from observable price changes in orderly transactions for the identical or similar investments of the same issuer as of March 31, 2024 or December 31, 2023. See further discussion on values within Note 4, Investment Securities.


	March 31, 2024					December 31, 2023
(in thousands)	Carrying Amounts		Fair Value		Fair Value Hierarchy	Carrying Amounts		Fair Value		Fair Value Hierarchy
Financial assets (recorded at amortized cost)
Cash and cash equivalents	$	36,308	$	36,308	Level 1	$	30,453	$	30,453	Level 1
Investment securities held-to-maturity	915,068		795,909		Level 2	925,198		814,830		Level 2
Loans, net of allowance for credit losses	2,029,462		1,913,418		Level 3	2,048,548		1,939,702		Level 3
Interest receivable	11,678		11,678		Level 2	12,752		12,752		Level 2
Financial liabilities (recorded at amortized cost)
Time deposits	267,536		268,758		Level 2	251,317		252,824		Level 2

FRBSF short-term borrowings under the BTFP	—		—		Level 2	26,000		25,998		Level 2


Interest payable	3,130		3,130		Level 2	2,752		2,752		Level 2

Investment Securities (Tables)

3 Months Ended

Mar. 31, 2024

Investments, Debt and Equity Securities [Abstract]

Schedule of Held-to-Maturity Amortized Cost and Fair Value

A summary of the amortized cost, fair value and allowance for credit losses related to securities held-to-maturity as of March 31, 2024 and December 31, 2023 is presented below.


Held-to-maturity:	Amortized Cost 1		Allowance for Credit Losses		Net Carrying Amount		Gross Unrealized				Fair Value
(in thousands)							Gains		(Losses)
March 31, 2024
Securities of U.S. government-sponsored enterprises:
MBS pass-through securities issued by FHLMC, FNMA and GNMA	$	300,976	$	—	$	300,976	$	—	$	(48,474)	$	252,502
CMOs issued by FHLMC	224,676		—		224,676		—		(26,902)		197,774
CMOs issued by FNMA	98,951		—		98,951		—		(6,009)		92,942
CMOs issued by GNMA	50,695		—		50,695		—		(5,436)		45,259
SBA-backed securities	1,652		—		1,652		—		(95)		1,557
Debentures of government-sponsored agencies	146,202		—		146,202		—		(22,942)		123,260
Obligations of state and political subdivisions	61,916		—		61,916		4		(8,022)		53,898
Corporate bonds	30,000		—		30,000		—		(1,283)		28,717
Total held-to-maturity	$	915,068	$	—	$	915,068	$	4	$	(119,163)	$	795,909
December 31, 2023

Securities of U.S. government-sponsored enterprises:
MBS pass-through securities issued by FHLMC, FNMA and GNMA	$	306,261	$	—	$	306,261	$	—	$	(44,396)	$	261,865
CMOs issued by FHLMC	226,416		—		226,416		28		(24,869)		201,575
CMOs issued by FNMA	101,502		—		101,502		—		(4,779)		96,723
CMOs issued by GNMA	51,006		—		51,006		—		(5,235)		45,771
SBA-backed securities	1,853		—		1,853		—		(90)		1,763
Debentures of government-sponsored agencies	146,126		—		146,126		—		(21,994)		124,132
Obligations of state and political subdivisions	62,034		—		62,034		47		(7,884)		54,197
Corporate bonds	30,000		—		30,000		—		(1,196)		28,804
Total held-to-maturity	$	925,198	$	—	$	925,198	$	75	$	(110,443)	$	814,830
1 Amortized cost and fair values exclude accrued interest receivable of $2.5 million and $3.6 million at March 31, 2024 and December 31, 2023, respectively, which is included in interest receivable and other assets in the consolidated statements of condition.

Schedule of Bond Ratings for Held-to-Maturity Securities

The following table summarizes the amortized cost of our portfolio of held-to-maturity securities issued by states and political subdivisions and corporate bonds by Moody's and/or Standard & Poor's bond ratings as of March 31, 2024 and December 31, 2023.


	Obligations of state and political subdivisions				Corporate bonds
(in thousands)	March 31, 2024		December 31, 2023		March 31, 2024		December 31, 2023
Aaa / AAA	$	42,474	$	42,577	$	—	$	—
Aa2 / AA	19,442		19,457		—		—
A2 / A	—		—		30,000		30,000
Total	$	61,916	$	62,034	$	30,000	$	30,000

Schedule of Available-for-Sale Securities Amortized Cost and Fair Value

A summary of the amortized cost, fair value and allowance for credit losses related to securities available-for-sale as of March 31, 2024 and December 31, 2023 is presented below.


Available-for-sale:	Amortized Cost 1		Gross Unrealized				Allowance for Credit Losses		Fair Value
(in thousands)			Gains		(Losses)
March 31, 2024
Securities of U.S. government-sponsored enterprises:
MBS pass-through securities issued by FHLMC, FNMA and GNMA	$	79,460	$	2	$	(10,073)	$	—	$	69,389
CMOs issued by FHLMC	261,797		—		(26,837)		—		234,960
CMOs issued by FNMA	23,099		—		(2,835)		—		20,264
CMOs issued by GNMA	19,486		—		(3,191)		—		16,295
SBA-backed securities	18,805		—		(1,657)		—		17,148
Debentures of government- sponsored agencies	73,906		—		(7,218)		—		66,688

U.S. Treasury securities	11,928		—		(1,394)		—		10,534
Obligations of state and political subdivisions	101,911		—		(11,568)		—		90,343
Corporate bonds	11,992		—		(1,248)		—		10,744

Total available-for-sale	$	602,384	$	2	$	(66,021)	$	—	$	536,365
December 31, 2023
Securities of U.S. government-sponsored enterprises:
MBS pass-through securities issued by FHLMC, FNMA and GNMA	$	81,937	$	2	$	(9,516)	$	—	$	72,423
CMOs issued by FHLMC	266,407		—		(24,758)		—		241,649
CMOs issued by FNMA	23,987		—		(2,715)		—		21,272
CMOs issued by GNMA	20,006		—		(2,878)		—		17,128
SBA-backed securities	21,126		—		(1,655)		—		19,471
Debentures of government- sponsored agencies	73,899		—		(7,037)		—		66,862

U.S. Treasury securities	11,923		—		(1,300)				10,623
Obligations of state and political subdivisions	102,202		1		(10,321)		—		91,882
Corporate bonds	11,992		—		(1,274)		—		10,718

Total available-for-sale	$	613,479	$	3	$	(61,454)	$	—	$	552,028
1 Amortized cost and fair value exclude accrued interest receivable of $2.3 million and $2.3 million at March 31, 2024 and December 31, 2023, respectively, which is included in interest receivable and other assets in the consolidated statements of condition.

Schedule of Investments Classified by Contractual Maturity Date

The amortized cost and fair value of investment debt securities by contractual maturity at March 31, 2024 and December 31, 2023 are shown below. Expected maturities may differ from contractual maturities if the issuers of the securities have the right to call or prepay obligations with or without call or prepayment penalties.


	March 31, 2024								December 31, 2023
	Held-to-Maturity				Available-for-Sale				Held-to-Maturity				Available-for-Sale
(in thousands)	Amortized Cost		Fair Value		Amortized Cost		Fair Value		Amortized Cost		Fair Value		Amortized Cost		Fair Value
Within one year	$	15,000	$	14,615	$	4,181	$	4,076	$	—	$	—	$	101	$	100
After one but within five years	72,200		69,109		249,923		228,662		87,887		84,541		226,669		208,444
After five years through ten years	304,877		259,599		62,426		54,421		304,976		261,654		95,552		85,447
After ten years	522,991		452,586		285,854		249,206		532,335		468,635		291,157		258,037
Total	$	915,068	$	795,909	$	602,384	$	536,365	$	925,198	$	814,830	$	613,479	$	552,028

Schedule of Financial Instruments Owned and Pledged as Collateral

The reported values of pledged investment securities are shown in the following table.


(in thousands)	March 31, 2024		December 31, 2023
Pledged to the State of California:
Secure public deposits in compliance with the Local Agency Security Program	$	282,826	$	287,436
Collateral for trust deposits	659		666
Collateral for Wealth Management and Trust Services checking account	557		562
Total investment securities pledged to the State of California	284,042		288,664
Bankruptcy trustee deposits pledged with Federal Reserve Bank	1,003		1,151
Pledged to FHLB Securities-Backed Credit Program	296,614		383,484
Pledged to the Federal Reserve "BTFP"	—		265,660
Pledged to the Federal Reserve Discount Window	345,896		—
Total pledged investment securities	$	927,555	$	938,959

Schedule of Unrealized Loss on Investments

Those securities are summarized and classified according to the duration of the loss period in the tables below:


March 31, 2024	< 12 continuous months				≥ 12 continuous months				Total securities in a loss position
(in thousands)	Fair value		Unrealized loss		Fair value		Unrealized loss		Fair value		Unrealized loss
Held-to-maturity:
MBS pass-through securities issued by FHLMC, FNMA and GNMA	$	—	$	—	$	252,501	$	(48,474)	$	252,501	$	(48,474)
CMOs issued by FHLMC	12,455		(68)		185,319		(26,834)		197,774		(26,902)
CMOs issued by FNMA	40,962		(1,054)		51,980		(4,955)		92,942		(6,009)
CMOs issued by GNMA	10,808		(350)		34,452		(5,086)		45,260		(5,436)
SBA-backed securities	—		—		1,556		(95)		1,556		(95)
Debentures of government-sponsored agencies	—		—		123,260		(22,942)		123,260		(22,942)
Obligations of state and political subdivisions	6,589		(46)		44,242		(7,976)		50,831		(8,022)
Corporate bonds	—		—		28,717		(1,283)		28,717		(1,283)
Total held-to-maturity	70,814		(1,518)		722,027		(117,645)		792,841		(119,163)
Available-for-sale:
MBS pass-through securities issued by FHLMC, FNMA and GNMA	3		—		69,152		(10,073)		69,155		(10,073)
CMOs issued by FHLMC	958		(4)		234,002		(26,833)		234,960		(26,837)
CMOs issued by FNMA	—		—		20,264		(2,835)		20,264		(2,835)
CMOs issued by GNMA	—		—		16,295		(3,191)		16,295		(3,191)
SBA-backed securities	—		—		17,148		(1,657)		17,148		(1,657)
Debentures of government- sponsored agencies	—		—		66,688		(7,218)		66,688		(7,218)
U.S. Treasury securities	—		—		10,534		(1,394)		10,534		(1,394)

Obligations of state and political subdivisions	557		(2)		89,786		(11,566)		90,343		(11,568)
Corporate bonds	—		—		10,744		(1,248)		10,744		(1,248)

Total available-for-sale	1,518		(6)		534,613		(66,015)		536,131		(66,021)
Total securities at loss position	$	72,332	$	(1,524)	$	1,256,640	$	(183,660)	$	1,328,972	$	(185,184)


December 31, 2023	< 12 continuous months				≥ 12 continuous months				Total securities in a loss position
(in thousands)	Fair value		Unrealized loss		Fair value		Unrealized loss		Fair value		Unrealized loss
Held-to-maturity:
MBS pass-through securities issued by FHLMC, FNMA and GNMA	$	—	$	—	$	261,865	$	(44,396)	$	261,865	$	(44,396)
CMOs issued by FHLMC	8,662		(21)		188,657		(24,848)		197,319		(24,869)
CMOs issued by FNMA	42,474		(411)		54,249		(4,368)		96,723		(4,779)
CMOs issued by GNMA	10,988		(244)		34,783		(4,991)		45,771		(5,235)
SBA-backed securities	—		—		1,763		(90)		1,763		(90)
Debentures of government- sponsored agencies	—		—		124,132		(21,994)		124,132		(21,994)
Obligations of state and political subdivisions	—		—		44,437		(7,884)		44,437		(7,884)
Corporate Bonds	—		—		28,804		(1,196)		28,804		(1,196)
Total held-to-maturity	62,124		(676)		738,690		(109,767)		800,814		(110,443)
Available-for-sale:
MBS pass-through securities issued by FHLMC, FNMA and GNMA	—		—		72,146		(9,516)		72,146		(9,516)
CMOs issued by FHLMC	1,235		(7)		240,414		(24,751)		241,649		(24,758)
CMOs issued by FNMA	—		—		21,272		(2,715)		21,272		(2,715)
CMOs issued by GNMA	—		—		17,128		(2,878)		17,128		(2,878)
SBA-backed securities	—		—		19,471		(1,655)		19,471		(1,655)
Debentures of government- sponsored agencies	—		—		66,862		(7,037)		66,862		(7,037)
U.S. Treasury securities	—		—		10,623		(1,300)		10,623		(1,300)
Obligations of state and political subdivisions	666		(1)		90,655		(10,320)		91,321		(10,321)
Corporate Bonds	—		—		10,718		(1,274)		10,718		(1,274)


Total available-for-sale	1,901		(8)		549,289		(61,446)		551,190		(61,454)
Total securities at loss position	$	64,025	$	(684)	$	1,287,979	$	(171,213)	$	1,352,004	$	(171,897)

- Definition

Tabular disclosure of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
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+ Details

- Definition

Tabular disclosure of information about investment in debt security measured at amortized cost (held-to-maturity).

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 320
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Reference 8: http://www.xbrl.org/2009/role/commonPracticeRef
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Reference 9: http://www.xbrl.org/2009/role/commonPracticeRef
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Reference 10: http://www.xbrl.org/2009/role/commonPracticeRef
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Reference 11: http://www.xbrl.org/2009/role/commonPracticeRef
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Reference 12: http://www.xbrl.org/2009/role/commonPracticeRef
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+ Details

Loans and Allowance for Credit Losses on Loans (Tables)

3 Months Ended

Mar. 31, 2024

Receivables [Abstract]

Schedule of Loans by Class

The following table presents the amortized cost of loans by portfolio class as of March 31, 2024 and December 31, 2023.


(in thousands)	March 31, 2024		December 31, 2023
Commercial and industrial	$	150,896	$	153,750
Real estate:
Commercial owner-occupied	328,560		333,181
Commercial non-owner occupied	1,236,633		1,219,385
Construction	71,494		99,164
Home equity	86,794		82,087
Other residential	113,479		118,508
Installment and other consumer loans	67,107		67,645
Total loans, at amortized cost 1	2,054,963		2,073,720
Allowance for credit losses on loans	(25,501)		(25,172)
Total loans, net of allowance for credit losses on loans	$	2,029,462	$	2,048,548

1 Amortized cost includes net deferred loan origination costs of $2.6 million and $2.7 million at March 31, 2024 and December 31, 2023, respectively. Amounts are also net of unrecognized purchase discounts of $1.9 million and $2.0 million at March 31, 2024 and December 31, 2023, respectively. Amortized cost excludes accrued interest, which totaled $6.3 million and $6.6 million at March 31, 2024 and December 31, 2023, respectively, and is included in interest receivable and other assets in the consolidated statements of condition.

Schedule of Loans by Risk Grade and Origination Year

The following tables present the loan portfolio by loan portfolio class, origination/renewal year and internal risk rating as of March 31, 2024 and December 31, 2023. The current year vintage table reflects gross charge-offs by loan portfolio class and year of origination. Generally, existing term loans that were re-underwritten are reflected in the table in the year of renewal. Lines of credit that have a conversion feature at the time of origination, such as construction to perm loans, are presented by year of origination.


(in thousands)	Term Loans - Amortized Cost by Origination Year												Revolving Loans Amortized Cost
March 31, 2024	2024		2023		2022		2021		2020		Prior				Total
Commercial and industrial:
Pass and Watch	$	2,650	$	23,105	$	9,107	$	2,726	$	3,474	$	33,698	$	64,683	$	139,443
Special Mention	—		—		—		—		—		306		1,443		1,749
Substandard	—		—		—		—		—		2,191		7,513		9,704
Total commercial and industrial	$	2,650	$	23,105	$	9,107	$	2,726	$	3,474	$	36,195	$	73,639	$	150,896
Gross current period charge-offs	$	—	$	—	$	—	$	—	$	—	$	—	$	(4)	$	(4)

Commercial real estate, owner-occupied:
Pass and Watch	$	3,187	$	14,053	$	45,948	$	49,506	$	36,162	$	148,036	$	5	$	296,897
Special Mention	—		386		—		15,491		816		10,113		—		26,806
Substandard	—		—		2,201		—		—		2,656		—		4,857

Total commercial real estate, owner-occupied	$	3,187	$	14,439	$	48,149	$	64,997	$	36,978	$	160,805	$	5	$	328,560

Commercial real estate, non-owner occupied:
Pass and Watch	$	20,233	$	76,466	$	171,120	$	196,087	$	161,259	$	502,571	$	10,102	$	1,137,838
Special Mention	—		—		2,776		8,309		11,696		36,797		—		59,578
Substandard	278		872		—		2,174		—		35,893		—		39,217

Total commercial real estate, non-owner occupied	$	20,511	$	77,338	$	173,896	$	206,570	$	172,955	$	575,261	$	10,102	$	1,236,633


(in thousands)	Term Loans - Amortized Cost by Origination Year												Revolving Loans Amortized Cost
March 31, 2024	2024		2023		2022		2021		2020		Prior				Total
Construction:
Pass and Watch	$	13,915	$	7,661	$	17,794	$	—	$	19,310	$	—	$	—	$	58,680
Special Mention	—		12,814		—		—		—		—		—		12,814

Total construction	$	13,915	$	20,475	$	17,794	$	—	$	19,310	$	—	$	—	$	71,494

Home equity:
Pass and Watch	$	—	$	—	$	—	$	—	$	—	$	764	$	85,149	$	85,913

Substandard	82		—		—		—		—		177		622		881
Total home equity	$	82	$	—	$	—	$	—	$	—	$	941	$	85,771	$	86,794

Other residential:
Pass and Watch	$	—	$	17,765	$	20,010	$	13,295	$	25,462	$	36,947	$	—	$	113,479


Total other residential	$	—	$	17,765	$	20,010	$	13,295	$	25,462	$	36,947	$	—	$	113,479

Installment and other consumer:
Pass and Watch	$	3,379	$	20,119	$	13,769	$	10,129	$	4,489	$	14,078	$	1,003	$	66,966

Substandard	—		—		—		141		—		—		—		141
Total installment and other consumer	$	3,379	$	20,119	$	13,769	$	10,270	$	4,489	$	14,078	$	1,003	$	67,107
Gross current period charge-offs	$	—	$	(14)	$	—	$	(3)	$	—	$	—	$	—	$	(17)
Total loans:
Pass and Watch	$	43,364	$	159,169	$	277,748	$	271,743	$	250,156	$	736,094	$	160,942	$	1,899,216
Total Special Mention	$	—	$	13,200	$	2,776	$	23,800	$	12,512	$	47,216	$	1,443	$	100,947
Total Substandard	$	360	$	872	$	2,201	$	2,315	$	—	$	40,917	$	8,135	$	54,800

Totals	$	43,724	$	173,241	$	282,725	$	297,858	$	262,668	$	824,227	$	170,520	$	2,054,963
Total gross current period charge-offs	$	—	$	(14)	$	—	$	(3)	$	—	$	—	$	(4)	$	(21)


(in thousands)	Term Loans - Amortized Cost by Origination Year												Revolving Loans Amortized Cost
December 31, 2023	2023		2022		2021		2020		2019		Prior				Total
Commercial and industrial:
Pass and Watch	$	25,615	$	9,187	$	2,970	$	3,718	$	15,128	$	21,004	$	62,486	$	140,108
Special Mention	—		—		—		—		334		—		9,300		9,634
Substandard	—		—		—		—		1,311		2,697		—		4,008
Total commercial and industrial	$	25,615	$	9,187	$	2,970	$	3,718	$	16,773	$	23,701	$	71,786	$	153,750

Commercial real estate, owner-occupied:
Pass and Watch	$	13,128	$	41,808	$	49,887	$	37,708	$	40,994	$	114,018	$	56	$	297,599
Special Mention	1,431		4,498		15,636		820		286		8,902		—		31,573
Substandard	—		2,231		—		—		—		1,778		—		4,009

Total commercial real estate, owner-occupied	$	14,559	$	48,537	$	65,523	$	38,528	$	41,280	$	124,698	$	56	$	333,181
Commercial real estate, non-owner occupied:
Pass and Watch	$	76,718	$	172,028	$	196,340	$	150,831	$	139,860	$	368,675	$	9,832	$	1,114,284
Special Mention	—		2,790		9,498		11,776		15,708		41,602		—		81,374
Substandard	878		272		2,204		—		—		20,373		—		23,727
Total commercial real estate, non-owner occupied	$	77,596	$	175,090	$	208,042	$	162,607	$	155,568	$	430,650	$	9,832	$	1,219,385
Construction:
Pass and Watch	$	13,138	$	24,403	$	19,521	$	29,512	$	—	$	—	$	—	$	86,574
Special Mention	12,590		—		—		—		—		—		—		12,590

Total construction	$	25,728	$	24,403	$	19,521	$	29,512	$	—	$	—	$	—	$	99,164
Home equity:
Pass and Watch	$	—	$	—	$	—	$	—	$	—	$	734	$	80,773	$	81,507

Substandard	—		—		—		—		—		369		211		580
Total home equity	$	—	$	—	$	—	$	—	$	—	$	1,103	$	80,984	$	82,087
Other residential:
Pass and Watch	$	17,861	$	20,114	$	13,390	$	25,637	$	20,935	$	20,571	$	—	$	118,508


Total other residential	$	17,861	$	20,114	$	13,390	$	25,637	$	20,935	$	20,571	$	—	$	118,508
Installment and other consumer:
Pass and Watch	$	22,038	$	14,528	$	10,632	$	4,687	$	5,300	$	9,399	$	1,061	$	67,645


Total installment and other consumer	$	22,038	$	14,528	$	10,632	$	4,687	$	5,300	$	9,399	$	1,061	$	67,645

Total loans:
Pass and Watch	$	168,498	$	282,068	$	292,740	$	252,093	$	222,217	$	534,401	$	154,208	$	1,906,225
Total Special Mention	$	14,021	$	7,288	$	25,134	$	12,596	$	16,328	$	50,504	$	9,300	$	135,171
Total Substandard	$	878	$	2,503	$	2,204	$	—	$	1,311	$	25,217	$	211	$	32,324

Totals	$	183,397	$	291,859	$	320,078	$	264,689	$	239,856	$	610,122	$	163,719	$	2,073,720

Schedule of Loans Outstanding and Aging Analysis

The following table shows the amortized cost of loans by portfolio class, payment aging and non-accrual status as of March 31, 2024 and December 31, 2023.


Loan Aging Analysis by Class
(in thousands)	Commercial and industrial		Commercial real estate, owner-occupied		Commercial real estate, non-owner occupied		Construction		Home equity		Other residential		Installment and other consumer		Total
March 31, 2024
30-59 days past due	$	13	$	101	$	872	$	1,057	$	360	$	—	$	3	$	2,406
60-89 days past due	390		—		—		—		—		—		—		390
90 days or more past due 1	29		140		10,292		—		—		—		—		10,461
Total past due	432		241		11,164		1,057		360		—		3		13,257
Current	150,464		328,319		1,225,469		70,437		86,434		113,479		67,104		2,041,706
Total loans 1	$	150,896	$	328,560	$	1,236,633	$	71,494	$	86,794	$	113,479	$	67,107	$	2,054,963
Non-accrual loans 2	$	2,220	$	416	$	3,045	$	—	$	473	$	—	$	141	$	6,295
Non-accrual loans with no allowance	$	—	$	416	$	872	$	—	$	473	$	—	$	141	$	1,902
December 31, 2023
30-59 days past due	$	2,991	$	618	$	—	$	—	$	43	$	83	$	195	$	3,930
60-89 days past due	69		—		2,204		—		—		—		1		2,274
90 days or more past due 1	1,311		149		—		—		—		—		—		1,460
Total past due	4,371		767		2,204		—		43		83		196		7,664
Current	149,379		332,414		1,217,181		99,164		82,044		118,425		67,449		2,066,056
Total loans 1	$	153,750	$	333,181	$	1,219,385	$	99,164	$	82,087	$	118,508	$	67,645	$	2,073,720
Non-accrual loans 2	$	4,008	$	434	$	3,081	$	—	$	469	$	—	$	—	$	7,992
Non-accrual loans with no allowance	$	1,311	$	434	$	877	$	—	$	469	$	—	$	—	$	3,091

1 There was one non-owner occupied commercial real estate loan 90 days past due and accruing interest as of March 31, 2024 that has been in extended renewal negotiations, but it is well-secured and expected to be restored to a current payment status in the near future. There were no non-performing loans over 90 days past due and accruing interest as of December 31, 2023.

2 None of the non-accrual loans as of March 31, 2024 or December 31, 2023 were earning interest on a cash or accrual basis. We reversed $10 thousand in accrued interest income for loans that were placed on non-accrual status during the three months ended March 31, 2024. We reversed accrued interest income of $16 thousand for loans that were placed on non-accrual status during the three months ended March 31, 2023.

Schedule of Collateral Dependent Non-Accrual Loans

The following table presents the amortized cost basis of individually analyzed collateral-dependent loans, which were all on non-accrual status, by portfolio class at March 31, 2024 and December 31, 2023.


	Amortized Cost by Collateral Type
(in thousands)	Commercial Real Estate		Residential Real Estate		Blanket Lien		Other		Total 1		Allowance for Credit Losses

March 31, 2024

Commercial real estate, owner-occupied	$	416	$	—	$	—	$	—	$	416	$	—
Commercial real estate, non-owner occupied	3,046		—		—		—		3,046		496

Home equity	—		473		—		—		473		—

Installment and other consumer	—		—		—		141		141		—
Total	$	3,462	$	473	$	—	$	141	$	4,076	$	496
December 31, 2023
Commercial and industrial	$	1,311	$	—	$	—	$	—	$	1,311	$	—
Commercial real estate, owner-occupied	434		—		—		—		434		—
Commercial real estate, non-owner occupied	3,081		—				—		3,081		408
Home equity	—		469		—		—		469		—




Total	$	4,826	$	469	$	—	$	—	$	5,295	$	408

1 There were no collateral-dependent residential real estate mortgage loans in process of foreclosure or in substance repossessed at March 31, 2024 and December 31, 2023. The weighted average loan-to-value of real estate secured collateral dependent loans was approximately 82% at March 31, 2024 and 70% at December 31, 2023.

Schedule of Loan Modifications to Borrowers Experiencing Financial Difficulty

The following table summarizes the amortized cost of loans as of March 31, 2024 that were modified during the three months ended March 31, 2024 by portfolio class and type of modification granted. There were no modifications of loans during the three months ended March 31, 2023 requiring disclosure.


(in thousands)	Term Extension		Percent of Portfolio Class Total
Three months ended March 31, 2024
Commercial and industrial	$	2,191	1.5	%



Home equity	82		0.1	%


Total	$	2,273

The following table summarizes the financial effect of loan modifications presented in the table above during the three months ended March 31, 2024 by portfolio class.


(in thousands)									Weighted-Average Term Extension (in years)
Three months ended March 31, 2024
Commercial and industrial									0.3



Home equity									15.0

The following table summarizes the amortized cost and payment status of loans as of March 31, 2024 that were modified during the three months ended March 31, 2024 by portfolio class.


(in thousands)	Current		30-59 Days Past Due		60-89 Days Past Due		90 Days or More Past Due		Total		Non-Accrual
Three months ended March 31, 2024
Commercial and industrial	$	2,191	$	—	$	—	$	—	$	2,191	$	2,191



Home equity	82		—		—		—		82		82


Total	$	2,273	$	—	$	—	$	—	$	2,273	$	2,273

Schedule of Allowance for Credit Losses on Financing Receivables

The following table presents the details of the allowance for credit losses on loans segregated by loan portfolio class as of March 31, 2024 and December 31, 2023.


Allocation of the Allowance for Credit Losses on Loans
(in thousands)	Commercial and industrial		Commercial real estate, owner-occupied		Commercial real estate, non-owner occupied		Construction		Home equity		Other residential		Installment and other consumer		Unallocated		Total
March 31, 2024
Modeled expected credit losses	$	940	$	1,326	$	7,744	$	119	$	559	$	670	$	655	$	—	$	12,013
Qualitative adjustments	628		1,174		6,767		1,163		68		22		265		2,049		12,136
Specific allocations	159		—		1,193		—		—		—		—		—		1,352
Total	$	1,727	$	2,500	$	15,704	$	1,282	$	627	$	692	$	920	$	2,049	$	25,501
December 31, 2023
Modeled expected credit losses	$	897	$	1,270	$	7,380	$	185	$	482	$	619	$	634	$	—	$	11,467
Qualitative adjustments	622		1,205		6,327		1,647		70		33		342		2,038		12,284
Specific allocations	193		1		1,226		—		—		1		—		—		1,421
Total	$	1,712	$	2,476	$	14,933	$	1,832	$	552	$	653	$	976	$	2,038	$	25,172

The following table discloses activity in the allowance for credit losses on loans for the periods presented.


Allowance for Credit Losses on Loans Rollforward
(in thousands)	Commercial and industrial		Commercial real estate, owner-occupied		Commercial real estate, non-owner occupied		Construction		Home equity		Other residential		Installment and other consumer		Unallocated		Total
Three months ended March 31, 2024
Beginning balance	$	1,712	$	2,476	$	14,933	$	1,832	$	552	$	653	$	976	$	2,038	$	25,172
(Reversal) Provision	19		24		771		(550)		75		39		(39)		11		350
(Charge-offs)	(4)		—		—		—		—		—		(17)		—		(21)
Recoveries	—		—		—		—		—		—		—		—		—
Ending balance	$	1,727	$	2,500	$	15,704	$	1,282	$	627	$	692	$	920	$	2,049	$	25,501
Three months ended March 31, 2023
Beginning balance	$	1,794	$	2,487	$	12,676	$	1,937	$	558	$	595	$	868	$	2,068	$	22,983
Provision (Reversal)	147		153		25		74		(20)		(18)		25		(36)		350

(Charge-offs)	(3)		—		—		—		—		—		(11)		—		(14)
Recoveries	3		—		—		8		—		—		—		—		11
Ending balance	$	1,941	$	2,640	$	12,701	$	2,019	$	538	$	577	$	882	$	2,032	$	23,330

Borrowings and Other Obligations (Tables)

3 Months Ended

Mar. 31, 2024

Debt Disclosure [Abstract]

Schedule of Debt

The carrying values and weighted average interest rates on borrowings and other obligations as of March 31, 2024 and December 31, 2023 are summarized in the following table.


	March 31, 2024				December 31, 2023
(dollars in thousands)	Carrying Value		Weighted Average Rate		Carrying Value		Weighted Average Rate
FHLB short-term borrowings	$	—	—	%	$	—	—	%
Federal funds lines of credit	—		—	%	—		—	%
FRBSF federal funds purchased	—		—	%	—		—	%
FRBSF short-term borrowings under the BTFP	—		—	%	26,000		5.30	%
Other obligations (finance leases)	260		2.14	%	298		1.88	%
Total borrowings and other obligations	$	260	2.14	%	$	26,298	5.26	%

Stockholders' Equity (Tables)

3 Months Ended

Mar. 31, 2024

Equity [Abstract]

Schedule of Information of Cashless Exercise Prices

The table below depicts the total number of shares, amount, and weighted average price withheld for cashless exercises for the periods presented.


	Three Months Ended
	March 31, 2024		March 31, 2023
Number of shares withheld	3,338		2,847
Total amount withheld (in thousands)	$	55	$	82
Weighted-average price	$	16.62	$	28.74

Commitments and Contingencies (Tables)

3 Months Ended

Mar. 31, 2024

Commitments and Contingencies Disclosure [Abstract]

Schedule of Undrawn Loan Commitments and Standby Letters of Credit

The contractual amount of unfunded loan commitments and standby letters of credit not reflected in the consolidated statements of condition are as follows:


(in thousands)	March 31, 2024		December 31, 2023
Commercial lines of credit	$	250,602	$	259,989
Revolving home equity lines	216,387		218,935
Undisbursed construction loans	10,176		13,943
Personal and other lines of credit	9,132		9,136
Standby letters of credit	3,147		3,147
Total unfunded loan commitments and standby letters of credit	$	489,444	$	505,150

Schedule of Operating and Finance Lease Right-of-Use Assets and Lease Liabilities

The following table shows the balances of operating and finance lease right-of-use assets and lease liabilities.


(in thousands)	March 31, 2024		December 31, 2023
Operating leases:
Operating lease right-of-use assets	$	21,553	$	20,316
Operating lease liabilities	$	24,150	$	22,906
Finance leases:
Finance lease right-of-use assets	$	608	$	608
Accumulated amortization	(356)		(319)
Finance lease right-of-use assets, net1	$	252	$	289
Finance lease liabilities 2	$	260	$	298
1 Included in premises and equipment in the consolidated statements of condition.
2 Included in borrowings and other obligations in the consolidated statements of condition.

Schedule of Components of Operating and Finance Lease Cost

The following table shows supplemental disclosures of noncash investing and financing activities for the periods presented.


	Three months ended
(in thousands)	March 31, 2024		March 31, 2023
Right-of-use assets obtained in exchange for operating lease liabilities	$	2,417	$	—

The following table shows components of operating and finance lease cost.


	Three months ended
(in thousands)	March 31, 2024		March 31, 2023
Operating lease cost 1	$	1,318	$	1,610


Finance lease cost:
Amortization of right-of-use assets 2	$	37	$	37
Interest on finance lease liabilities 3	1		2
Total finance lease cost	$	38	$	39
Total lease cost	$	1,356	$	1,649
1 Included in occupancy and equipment expense in the consolidated statements of comprehensive income.
2 Included in depreciation and amortization in the consolidated statements of comprehensive income.
3 Included in interest on borrowings and other obligations in the consolidated statements of comprehensive income.

Schedule of Operating Lease Liability Maturities

The following table shows the future minimum lease payments, weighted average remaining lease terms, and weighted average discount rates under operating and finance lease arrangements as of March 31, 2024. The discount rates used to calculate the present value of lease liabilities were based on the collateralized FHLB borrowing rates that were commensurate with lease terms and minimum payments on the lease commencement date.


(in thousands)	March 31, 2024
Year	Operating Leases			Finance Leases
2024	$	3,630		$	117
2025	4,295			108
2026	3,561			37
2027	3,291			5
2028	2,910			—
Thereafter	9,856			—
Total minimum lease payments	27,543			267
Amounts representing interest (present value discount)	(3,393)			(7)
Present value of net minimum lease payments (lease liability)	$	24,150		$	260
Weighted average remaining term (in years)	8.0			2.0
Weighted average discount rate	2.72		%	2.14		%

Schedule of Finance Lease Liability Maturities

The following table shows the future minimum lease payments, weighted average remaining lease terms, and weighted average discount rates under operating and finance lease arrangements as of March 31, 2024. The discount rates used to calculate the present value of lease liabilities were based on the collateralized FHLB borrowing rates that were commensurate with lease terms and minimum payments on the lease commencement date.


(in thousands)	March 31, 2024
Year	Operating Leases			Finance Leases
2024	$	3,630		$	117
2025	4,295			108
2026	3,561			37
2027	3,291			5
2028	2,910			—
Thereafter	9,856			—
Total minimum lease payments	27,543			267
Amounts representing interest (present value discount)	(3,393)			(7)
Present value of net minimum lease payments (lease liability)	$	24,150		$	260
Weighted average remaining term (in years)	8.0			2.0
Weighted average discount rate	2.72		%	2.14		%

Derivative Financial Instruments and Hedging Activities (Tables)

3 Months Ended

Mar. 31, 2024

Derivative Instruments and Hedging Activities Disclosure [Abstract]

Schedule of Derivative Instruments in Statement of Financial Position, Fair Value

Information on our derivatives follows:


	Asset derivatives				Liability derivatives
(in thousands)	March 31, 2024		December 31, 2023		March 31, 2024		December 31, 2023
Available-for-sale securities:
Interest rate swaps - notional amount	$	—	$	—	$	101,770	$	101,770
Interest rate swaps - fair value1	$	—	$	—	$	142	$	1,359
Loans receivable:
Interest rate contracts - notional amount	$	8,366	$	6,441	$	—	$	2,157
Interest rate contracts - fair value1	$	400	$	287	$	—	$	2

1 Refer to Note 3, Fair Value of Assets and Liabilities, for valuation methodology.

The following table presents the carrying amount and associated cumulative basis adjustment related to the application of fair value hedge accounting that is included in the carrying amount of hedged assets as of March 31, 2024 and December 31, 2023.


	Carrying Amounts of Hedged Assets				Cumulative Amounts of Fair Value Hedging Adjustments Included in the Carrying Amounts of the Hedged Assets
(in thousands)	March 31, 2024		December 31, 2023		March 31, 2024		December 31, 2023
Available-for-sale securities 1	$	108,125	$	107,181	$	(142)	$	(1,359)
Loans receivable 2	$	7,841	$	8,183	$	(478)	$	(367)
1 Carrying value equals the amortized cost basis of the securities underlying the hedge relationship, which is the book value net of the fair value hedge adjustment. Amortized cost excludes accrued interest totaling $233 thousand and $222 thousand as of March 31, 2024 and December 31, 2023, respectively.
2 Carrying value equals the amortized cost basis of the loans underlying the hedge relationship, which is the loan balance net of deferred loan origination fees and cost and the fair value hedge adjustment. Amortized cost excludes accrued interest, which was not material.

Schedule of Derivative Instruments, Losses in Statement of Financial Performance

The following table presents the pretax net gains (losses) recognized in interest income related to our fair value hedges for the years presented.


	Three months ended
(in thousands)	March 31, 2024		March 31, 2023
Interest on investment securities 1
Increase in fair value of interest rate swaps hedging available-for-sale securities	$	1,217	$	—
Hedged interest earned	206		—
Decrease in carrying value included in the hedged available-for-sale securities	(1,217)		—
Net gain (loss) recognized in interest income on investment securities	$	206	$	—
Interest and fees on loans 1
Increase (decrease) in fair value of interest rate swaps hedging loans receivable	$	115	$	(221)
Hedged interest earned	54		51
(Decrease) increase in carrying value included in the hedged loans	(110)		221
Decrease in value of yield maintenance agreement	(2)		(2)
Net gain recognized in interest income on loans	$	57	$	49
1 Represents the income line item in the statement of comprehensive income in which the effects of fair value hedges are recorded.

Schedule of Offsetting Assets and Liabilities

Information on financial instruments that are eligible for offset in the consolidated statements of condition follows:


Offsetting of Financial Assets and Derivative Assets
			Gross Amounts		Net Amounts of		Gross Amounts Not Offset in
	Gross Amounts		Offset in the		Assets Presented		the Statements of Condition
	of Recognized		Statements of		in the Statements		Financial		Cash Collateral
(in thousands)	Assets1		Condition		of Condition1		Instruments		Received		Net Amount
March 31, 2024

Counterparty	$	400	$	—	$	400	$	—	$	—	$	400
Total	$	400	$	—	$	400	$	—	$	—	$	400
December 31, 2023

Counterparty	$	287	$	—	$	287	$	—	$	—	$	287
Total	$	287	$	—	$	287	$	—	$	—	$	287



Offsetting of Financial Liabilities and Derivative Liabilities
			Gross Amounts		Net Amounts of		Gross Amounts Not Offset in
	Gross Amounts		Offset in the		Assets Presented		the Statements of Condition
	of Recognized		Statements of		in the Statements		Financial		Cash Collateral
(in thousands)	Assets1		Condition		of Condition1		Instruments		Received		Net Amount
March 31, 2024

Counterparty	142		—		142		(142)		—		—
Total	$	142	$	—	$	142	$	(142)	$	—	$	—
December 31, 2023
Counterparty	$	1,361	$	—	$	1,361	$	(287)	$	(330)	$	744

Total	$	1,361	$	—	$	1,361	$	(287)	$	(330)	$	744

1 Amounts exclude accrued interest on swaps.

Basis of Presentation (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2024	Dec. 31, 2023	Mar. 31, 2023
Earnings Per Share, Basic and Diluted [Abstract]
Weighted average basic common shares outstanding (in shares)	16,081	16,040	15,970
Potentially dilutive common shares related to:
Stock options (in shares)	0		14
Unvested restricted stock awards (in shares)	11		15
Weighted average diluted shares outstanding (in shares)	16,092	16,052	15,999
Net income	$ 2,922	$ 610	$ 9,440
Basic EPS (in dollars per share)	$ 0.18	$ 0.04	$ 0.59
Diluted EPS (in dollars per share)	$ 0.18	$ 0.04	$ 0.59
Weighted average anti-dilutive common shares not included in the calculation of diluted EPS (in shares)	340		250

Recently Adopted and Issued Accounting Standards (Details)	3 Months Ended
	Mar. 31, 2024 segment
Accounting Policies [Abstract]
Number of reportable segments	1

Fair Value of Assets and Liabilities - Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis (Details) - USD ($) $ in Thousands	Mar. 31, 2024	Dec. 31, 2023
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities	$ 536,365	$ 552,028
SBA-backed securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities	17,148	19,471
Debentures of government- sponsored agencies
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities	66,688	66,862
U.S. Treasury securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities	10,534	10,623
Obligations of state and political subdivisions
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities	90,343	91,882
Corporate bonds
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities	10,744	10,718
Carrying Value \| Assets and liabilities at fair value measured on a recurring basis \| Mortgage-backed securities and collateralized mortgage obligations issued by U.S. government-sponsored agencies
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities	340,908	352,472
Carrying Value \| Assets and liabilities at fair value measured on a recurring basis \| SBA-backed securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities	17,148	19,471
Carrying Value \| Assets and liabilities at fair value measured on a recurring basis \| Debentures of government- sponsored agencies
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities	66,688	66,862
Carrying Value \| Assets and liabilities at fair value measured on a recurring basis \| U.S. Treasury securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities	10,534	10,623
Carrying Value \| Assets and liabilities at fair value measured on a recurring basis \| Obligations of state and political subdivisions
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities	90,343	91,882
Carrying Value \| Assets and liabilities at fair value measured on a recurring basis \| Corporate bonds
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities	10,744	10,718
Carrying Value \| Assets and liabilities at fair value measured on a recurring basis \| Interest rate contracts
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative financial assets (interest rate contracts)	400	287
Derivative financial liabilities (interest rate contracts)	142	1,361
Fair Value \| Assets and liabilities at fair value measured on a recurring basis \| Mortgage-backed securities and collateralized mortgage obligations issued by U.S. government-sponsored agencies \| Quoted Prices in Active Markets for Identical Assets (Level 1)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities	0	0
Fair Value \| Assets and liabilities at fair value measured on a recurring basis \| Mortgage-backed securities and collateralized mortgage obligations issued by U.S. government-sponsored agencies \| Significant Other Observable Inputs (Level 2)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities	340,908	352,472
Fair Value \| Assets and liabilities at fair value measured on a recurring basis \| Mortgage-backed securities and collateralized mortgage obligations issued by U.S. government-sponsored agencies \| Significant Unobservable Inputs (Level 3)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities	0	0
Fair Value \| Assets and liabilities at fair value measured on a recurring basis \| SBA-backed securities \| Quoted Prices in Active Markets for Identical Assets (Level 1)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities	0	0
Fair Value \| Assets and liabilities at fair value measured on a recurring basis \| SBA-backed securities \| Significant Other Observable Inputs (Level 2)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities	17,148	19,471
Fair Value \| Assets and liabilities at fair value measured on a recurring basis \| SBA-backed securities \| Significant Unobservable Inputs (Level 3)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities	0	0
Fair Value \| Assets and liabilities at fair value measured on a recurring basis \| Debentures of government- sponsored agencies \| Quoted Prices in Active Markets for Identical Assets (Level 1)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities	0	0
Fair Value \| Assets and liabilities at fair value measured on a recurring basis \| Debentures of government- sponsored agencies \| Significant Other Observable Inputs (Level 2)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities	66,688	66,862
Fair Value \| Assets and liabilities at fair value measured on a recurring basis \| Debentures of government- sponsored agencies \| Significant Unobservable Inputs (Level 3)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities	0	0
Fair Value \| Assets and liabilities at fair value measured on a recurring basis \| U.S. Treasury securities \| Quoted Prices in Active Markets for Identical Assets (Level 1)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities	10,534	10,623
Fair Value \| Assets and liabilities at fair value measured on a recurring basis \| U.S. Treasury securities \| Significant Other Observable Inputs (Level 2)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities	0	0
Fair Value \| Assets and liabilities at fair value measured on a recurring basis \| U.S. Treasury securities \| Significant Unobservable Inputs (Level 3)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities	0	0
Fair Value \| Assets and liabilities at fair value measured on a recurring basis \| Obligations of state and political subdivisions \| Quoted Prices in Active Markets for Identical Assets (Level 1)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities	0	0
Fair Value \| Assets and liabilities at fair value measured on a recurring basis \| Obligations of state and political subdivisions \| Significant Other Observable Inputs (Level 2)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities	90,343	91,882
Fair Value \| Assets and liabilities at fair value measured on a recurring basis \| Obligations of state and political subdivisions \| Significant Unobservable Inputs (Level 3)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities	0	0
Fair Value \| Assets and liabilities at fair value measured on a recurring basis \| Corporate bonds \| Quoted Prices in Active Markets for Identical Assets (Level 1)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities	0	0
Fair Value \| Assets and liabilities at fair value measured on a recurring basis \| Corporate bonds \| Significant Other Observable Inputs (Level 2)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities	10,744	10,718
Fair Value \| Assets and liabilities at fair value measured on a recurring basis \| Corporate bonds \| Significant Unobservable Inputs (Level 3)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities	0	0
Fair Value \| Assets and liabilities at fair value measured on a recurring basis \| Interest rate contracts \| Quoted Prices in Active Markets for Identical Assets (Level 1)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative financial assets (interest rate contracts)	0	0
Derivative financial liabilities (interest rate contracts)	0	0
Fair Value \| Assets and liabilities at fair value measured on a recurring basis \| Interest rate contracts \| Significant Other Observable Inputs (Level 2)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative financial assets (interest rate contracts)	400	287
Derivative financial liabilities (interest rate contracts)	142	1,361
Fair Value \| Assets and liabilities at fair value measured on a recurring basis \| Interest rate contracts \| Significant Unobservable Inputs (Level 3)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative financial assets (interest rate contracts)	0	0
Derivative financial liabilities (interest rate contracts)	$ 0	$ 0

Fair Value of Assets and Liabilities - Narrative (Details)	3 Months Ended
	Mar. 31, 2024 USD ($) security	Mar. 31, 2023 USD ($)	Dec. 31, 2023 security
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Credit loss expense on held-to-maturity securities \| $	$ 0	$ 0
Significant Unobservable Inputs (Level 3)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Number of securities \| security	0		0

Fair Value of Assets and Liabilities - Schedule of Fair Value of Financial Instruments (Details) - USD ($) $ in Thousands	Mar. 31, 2024	Dec. 31, 2023
Financial assets (recorded at amortized cost)
Investment securities held-to-maturity	$ 795,909	$ 814,830
Level 1 \| Carrying Value
Financial assets (recorded at amortized cost)
Cash and cash equivalents	36,308	30,453
Level 1 \| Fair Value
Financial assets (recorded at amortized cost)
Cash and cash equivalents	36,308	30,453
Level 2 \| Carrying Value
Financial assets (recorded at amortized cost)
Investment securities held-to-maturity	915,068	925,198
Interest receivable	11,678	12,752
Financial liabilities (recorded at amortized cost)
Time deposits	267,536	251,317
FRBSF short-term borrowings under the BTFP	0	26,000
Interest payable	3,130	2,752
Level 2 \| Fair Value
Financial assets (recorded at amortized cost)
Investment securities held-to-maturity	795,909	814,830
Interest receivable	11,678	12,752
Financial liabilities (recorded at amortized cost)
Time deposits	268,758	252,824
FRBSF short-term borrowings under the BTFP	0	25,998
Interest payable	3,130	2,752
Level 3 \| Carrying Value
Financial assets (recorded at amortized cost)
Loans, net of allowance for credit losses	2,029,462	2,048,548
Level 3 \| Fair Value
Financial assets (recorded at amortized cost)
Loans, net of allowance for credit losses	$ 1,913,418	$ 1,939,702

Investment Securities - Schedule of Held-to-Maturity Amortized Cost and Fair Value (Details) - USD ($)	Mar. 31, 2024	Dec. 31, 2023
Schedule of Available-for-sale Securities and Held-to-maturity Securities [Line Items]
Debt securities, held-to-maturity	$ 915,068,000	$ 925,198,000
Allowance for Credit Losses	0	0
Net Carrying Amount	915,068,000	925,198,000
Held-to-maturity, gross unrealized gains	4,000	75,000
Held-to-maturity, gross unrealized losses	(119,163,000)	(110,443,000)
Total	795,909,000	814,830,000
Accrued interest	2,500,000	3,600,000
MBS pass-through securities issued by FHLMC, FNMA and GNMA
Schedule of Available-for-sale Securities and Held-to-maturity Securities [Line Items]
Debt securities, held-to-maturity	300,976,000	306,261,000
Allowance for Credit Losses	0	0
Net Carrying Amount	300,976,000	306,261,000
Held-to-maturity, gross unrealized gains	0	0
Held-to-maturity, gross unrealized losses	(48,474,000)	(44,396,000)
Total	252,502,000	261,865,000
CMOs issued by FHLMC
Schedule of Available-for-sale Securities and Held-to-maturity Securities [Line Items]
Debt securities, held-to-maturity	224,676,000	226,416,000
Allowance for Credit Losses	0	0
Net Carrying Amount	224,676,000	226,416,000
Held-to-maturity, gross unrealized gains	0	28,000
Held-to-maturity, gross unrealized losses	(26,902,000)	(24,869,000)
Total	197,774,000	201,575,000
CMOs issued by FNMA
Schedule of Available-for-sale Securities and Held-to-maturity Securities [Line Items]
Debt securities, held-to-maturity	98,951,000	101,502,000
Allowance for Credit Losses	0	0
Net Carrying Amount	98,951,000	101,502,000
Held-to-maturity, gross unrealized gains	0	0
Held-to-maturity, gross unrealized losses	(6,009,000)	(4,779,000)
Total	92,942,000	96,723,000
CMOs issued by GNMA
Schedule of Available-for-sale Securities and Held-to-maturity Securities [Line Items]
Debt securities, held-to-maturity	50,695,000	51,006,000
Allowance for Credit Losses	0	0
Net Carrying Amount	50,695,000	51,006,000
Held-to-maturity, gross unrealized gains	0	0
Held-to-maturity, gross unrealized losses	(5,436,000)	(5,235,000)
Total	45,259,000	45,771,000
SBA-backed securities
Schedule of Available-for-sale Securities and Held-to-maturity Securities [Line Items]
Debt securities, held-to-maturity	1,652,000	1,853,000
Allowance for Credit Losses	0	0
Net Carrying Amount	1,652,000	1,853,000
Held-to-maturity, gross unrealized gains	0	0
Held-to-maturity, gross unrealized losses	(95,000)	(90,000)
Total	1,557,000	1,763,000
Debentures of government- sponsored agencies
Schedule of Available-for-sale Securities and Held-to-maturity Securities [Line Items]
Debt securities, held-to-maturity	146,202,000	146,126,000
Allowance for Credit Losses	0	0
Net Carrying Amount	146,202,000	146,126,000
Held-to-maturity, gross unrealized gains	0	0
Held-to-maturity, gross unrealized losses	(22,942,000)	(21,994,000)
Total	123,260,000	124,132,000
Obligations of state and political subdivisions
Schedule of Available-for-sale Securities and Held-to-maturity Securities [Line Items]
Debt securities, held-to-maturity	61,916,000	62,034,000
Allowance for Credit Losses	0	0
Net Carrying Amount	61,916,000	62,034,000
Held-to-maturity, gross unrealized gains	4,000	47,000
Held-to-maturity, gross unrealized losses	(8,022,000)	(7,884,000)
Total	53,898,000	54,197,000
Corporate bonds
Schedule of Available-for-sale Securities and Held-to-maturity Securities [Line Items]
Debt securities, held-to-maturity	30,000,000	30,000,000
Allowance for Credit Losses	0	0
Net Carrying Amount	30,000,000	30,000,000
Held-to-maturity, gross unrealized gains	0	0
Held-to-maturity, gross unrealized losses	(1,283,000)	(1,196,000)
Total	$ 28,717,000	$ 28,804,000

Investment Securities - Narrative (Details)	Mar. 31, 2024 USD ($) security	Dec. 31, 2023 USD ($) security	Jul. 07, 2023 USD ($)
Debt Securities, Available-for-sale [Line Items]
Held-to-maturity, allowance for credit Loss \| $	$ 0	$ 0
Number of investment securities in unrealized loss position \| security	317	313
Number of investment securities in unrealized loss position longer than 12 months \| security	306
Number of investment securities in unrealized loss position less than 12 months \| security	11
Debt securities, available-for-sale unrealized loss position, allowance for credit loss \| $	$ 0	$ 0
Interest rate swap
Debt Securities, Available-for-sale [Line Items]
Derivative, notional amount \| $			$ 101,800,000

- Definition

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

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 320
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147481800/320-10-50-2

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 320
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147481800/320-10-50-2

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Topic 320
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (aa)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147481800/320-10-50-2

Reference 4: http://www.xbrl.org/2003/role/disclosureRef
-Topic 320
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (aaa)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147481800/320-10-50-2

Reference 5: http://www.xbrl.org/2003/role/disclosureRef
-Topic 320
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147481800/320-10-50-2

Reference 6: http://www.xbrl.org/2003/role/disclosureRef
-Topic 320
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (c)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147481800/320-10-50-2

Reference 7: http://www.xbrl.org/2003/role/disclosureRef
-Topic 320
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (d)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147481800/320-10-50-2

Reference 8: http://www.xbrl.org/2003/role/disclosureRef
-Topic 320
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 3
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147481800/320-10-50-3

Reference 9: http://www.xbrl.org/2003/role/disclosureRef
-Topic 320
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 3
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147481800/320-10-50-3

Reference 10: http://www.xbrl.org/2003/role/disclosureRef
-Topic 320
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 3
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147481800/320-10-50-3

Reference 11: http://www.xbrl.org/2003/role/disclosureRef
-Topic 320
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 3
-Subparagraph (c)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147481800/320-10-50-3

Reference 12: http://www.xbrl.org/2003/role/disclosureRef
-Topic 320
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 3
-Subparagraph (d)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147481800/320-10-50-3

+ Details

Investment Securities - Schedule of Bond Ratings For Held-to-Maturity Securities (Details) - USD ($) $ in Thousands	Mar. 31, 2024	Dec. 31, 2023
Debt Securities, Held-to-maturity, Credit Quality Indicator [Line Items]
Debt securities, held-to-maturity	$ 915,068	$ 925,198
Obligations of state and political subdivisions
Debt Securities, Held-to-maturity, Credit Quality Indicator [Line Items]
Debt securities, held-to-maturity	61,916	62,034
Corporate bonds
Debt Securities, Held-to-maturity, Credit Quality Indicator [Line Items]
Debt securities, held-to-maturity	30,000	30,000
Aaa / AAA \| Obligations of state and political subdivisions
Debt Securities, Held-to-maturity, Credit Quality Indicator [Line Items]
Debt securities, held-to-maturity	42,474	42,577
Aaa / AAA \| Corporate bonds
Debt Securities, Held-to-maturity, Credit Quality Indicator [Line Items]
Debt securities, held-to-maturity	0	0
Aa2 / AA \| Obligations of state and political subdivisions
Debt Securities, Held-to-maturity, Credit Quality Indicator [Line Items]
Debt securities, held-to-maturity	19,442	19,457
Aa2 / AA \| Corporate bonds
Debt Securities, Held-to-maturity, Credit Quality Indicator [Line Items]
Debt securities, held-to-maturity	0	0
A2 / A \| Obligations of state and political subdivisions
Debt Securities, Held-to-maturity, Credit Quality Indicator [Line Items]
Debt securities, held-to-maturity	0	0
A2 / A \| Corporate bonds
Debt Securities, Held-to-maturity, Credit Quality Indicator [Line Items]
Debt securities, held-to-maturity	$ 30,000	$ 30,000

Investment Securities - Schedule of Available-for-Sale Securities Amortized Cost and Fair Value (Details) - USD ($)	Mar. 31, 2024	Dec. 31, 2023
Debt Securities, Available-for-sale [Line Items]
Available-for-sale, amortized cost	$ 602,384,000	$ 613,479,000
Available-for-sale, gross unrealized gains	2,000	3,000
Available-for-sale, gross unrealized losses	(66,021,000)	(61,454,000)
Allowance for Credit Losses	0	0
Fair Value	$ 536,365,000	$ 552,028,000
Debt securities, available-for-sale, accrued interest, after allowance for credit loss, statement of financial position [Extensible Enumeration]	Interest receivable and other assets	Interest receivable and other assets
Accrued interest	$ 2,300,000	$ 2,300,000
MBS pass-through securities issued by FHLMC, FNMA and GNMA
Debt Securities, Available-for-sale [Line Items]
Available-for-sale, amortized cost	79,460,000	81,937,000
Available-for-sale, gross unrealized gains	2,000	2,000
Available-for-sale, gross unrealized losses	(10,073,000)	(9,516,000)
Allowance for Credit Losses	0	0
Fair Value	69,389,000	72,423,000
CMOs issued by FHLMC
Debt Securities, Available-for-sale [Line Items]
Available-for-sale, amortized cost	261,797,000	266,407,000
Available-for-sale, gross unrealized gains	0	0
Available-for-sale, gross unrealized losses	(26,837,000)	(24,758,000)
Allowance for Credit Losses	0	0
Fair Value	234,960,000	241,649,000
CMOs issued by FNMA
Debt Securities, Available-for-sale [Line Items]
Available-for-sale, amortized cost	23,099,000	23,987,000
Available-for-sale, gross unrealized gains	0	0
Available-for-sale, gross unrealized losses	(2,835,000)	(2,715,000)
Allowance for Credit Losses	0	0
Fair Value	20,264,000	21,272,000
CMOs issued by GNMA
Debt Securities, Available-for-sale [Line Items]
Available-for-sale, amortized cost	19,486,000	20,006,000
Available-for-sale, gross unrealized gains	0	0
Available-for-sale, gross unrealized losses	(3,191,000)	(2,878,000)
Allowance for Credit Losses	0	0
Fair Value	16,295,000	17,128,000
SBA-backed securities
Debt Securities, Available-for-sale [Line Items]
Available-for-sale, amortized cost	18,805,000	21,126,000
Available-for-sale, gross unrealized gains	0	0
Available-for-sale, gross unrealized losses	(1,657,000)	(1,655,000)
Allowance for Credit Losses	0	0
Fair Value	17,148,000	19,471,000
Debentures of government- sponsored agencies
Debt Securities, Available-for-sale [Line Items]
Available-for-sale, amortized cost	73,906,000	73,899,000
Available-for-sale, gross unrealized gains	0	0
Available-for-sale, gross unrealized losses	(7,218,000)	(7,037,000)
Allowance for Credit Losses	0	0
Fair Value	66,688,000	66,862,000
U.S. Treasury securities
Debt Securities, Available-for-sale [Line Items]
Available-for-sale, amortized cost	11,928,000	11,923,000
Available-for-sale, gross unrealized gains	0	0
Available-for-sale, gross unrealized losses	(1,394,000)	(1,300,000)
Allowance for Credit Losses	0
Fair Value	10,534,000	10,623,000
Obligations of state and political subdivisions
Debt Securities, Available-for-sale [Line Items]
Available-for-sale, amortized cost	101,911,000	102,202,000
Available-for-sale, gross unrealized gains	0	1,000
Available-for-sale, gross unrealized losses	(11,568,000)	(10,321,000)
Allowance for Credit Losses	0	0
Fair Value	90,343,000	91,882,000
Corporate bonds
Debt Securities, Available-for-sale [Line Items]
Available-for-sale, amortized cost	11,992,000	11,992,000
Available-for-sale, gross unrealized gains	0	0
Available-for-sale, gross unrealized losses	(1,248,000)	(1,274,000)
Allowance for Credit Losses	0	0
Fair Value	$ 10,744,000	$ 10,718,000

Investment Securities - Schedule of Investments Classified by Contractual Maturity Date (Details) - USD ($) $ in Thousands	Mar. 31, 2024	Dec. 31, 2023
Held-to-maturity Securities, Amortized Cost
Within one year	$ 15,000	$ 0
After one but within five years	72,200	87,887
After five years through ten years	304,877	304,976
After ten years	522,991	532,335
Total	915,068	925,198
Held-to-maturity Securities, Fair Value
Within one year	14,615	0
After one but within five years	69,109	84,541
After five years through ten years	259,599	261,654
After ten years	452,586	468,635
Total	795,909	814,830
Available-for-sale Securities, Amortized Cost
Within one year	4,181	101
After one but within five years	249,923	226,669
After five years through ten years	62,426	95,552
After ten years	285,854	291,157
Total	602,384	613,479
Available-for-sale Securities, Fair Value
Within one year	4,076	100
After one but within five years	228,662	208,444
After five years through ten years	54,421	85,447
After ten years	249,206	258,037
Total	$ 536,365	$ 552,028

Investment Securities - Schedule of Financial Instruments Owned and Pledged as Collateral (Details) - USD ($) $ in Thousands	Mar. 31, 2024	Dec. 31, 2023
Financial Instruments Owned and Pledged as Collateral [Line Items]
Available-for-sale securities pledged as collateral	$ 927,555	$ 938,959
State of California
Financial Instruments Owned and Pledged as Collateral [Line Items]
Available-for-sale securities pledged as collateral	284,042	288,664
Public deposits
Financial Instruments Owned and Pledged as Collateral [Line Items]
Available-for-sale securities pledged as collateral	282,826	287,436
Trust deposits
Financial Instruments Owned and Pledged as Collateral [Line Items]
Available-for-sale securities pledged as collateral	659	666
Internal checking account
Financial Instruments Owned and Pledged as Collateral [Line Items]
Available-for-sale securities pledged as collateral	557	562
Bankruptcy trustee deposits
Financial Instruments Owned and Pledged as Collateral [Line Items]
Available-for-sale securities pledged as collateral	1,003	1,151
FHLB Securities Backed Credit Program
Financial Instruments Owned and Pledged as Collateral [Line Items]
Available-for-sale securities pledged as collateral	296,614	383,484
FRBSF short-term borrowings under the BTFP
Financial Instruments Owned and Pledged as Collateral [Line Items]
Available-for-sale securities pledged as collateral	0	265,660
Federal Reserve Discount Window
Financial Instruments Owned and Pledged as Collateral [Line Items]
Available-for-sale securities pledged as collateral	$ 345,896	$ 0

Investment Securities - Schedule of Unrealized Loss on Investments (Details) - USD ($) $ in Thousands	Mar. 31, 2024	Dec. 31, 2023
Debt Securities, Held-to-maturity, Fair Value
Less than 12 continuous months	$ 70,814	$ 62,124
Greater than or equal to 12 continuous months	722,027	738,690
Total securities in a loss position	792,841	800,814
Debt Securities, Held-to-maturity, Unrealized Loss
Less than 12 continuous months	(1,518)	(676)
Greater than or equal to 12 continuous months	(117,645)	(109,767)
Held-to-maturity, gross unrealized losses	(119,163)	(110,443)
Debt Securities, Available-For-Sale, Fair Value
Available-for-sale, less than 12 continuous months, fair value	1,518	1,901
Available-for-sale, greater than 12 continuous months, fair value	534,613	549,289
Available-for-sale, total securities in a loss position, fair value	536,131	551,190
Debt Securities, Available-for-sale, Unrealized Loss
Available-for-sale, less than 12 continuous months, unrealized loss	(6)	(8)
Available-for-sale, greater than 12 continuous months, unrealized loss	(66,015)	(61,446)
Available-for-sale, total securities in a loss position, unrealized loss	(66,021)	(61,454)
Marketable Securities, Fair Value
Marketable securities, less than 12 continuous months, fair value	72,332	64,025
Marketable securities, greater than 12 continuous months, fair value	1,256,640	1,287,979
Marketable securities, total securities in a loss position, fair value	1,328,972	1,352,004
Marketable Securities, Continuous Unrealized Loss
Marketable securities, less than 12 continuous months, unrealized loss	(1,524)	(684)
Marketable securities, greater than 12 continuous months, unrealized loss	(183,660)	(171,213)
Marketable securities, total securities in a loss position, unrealized loss	(185,184)	(171,897)
MBS pass-through securities issued by FHLMC, FNMA and GNMA
Debt Securities, Held-to-maturity, Fair Value
Less than 12 continuous months	0	0
Greater than or equal to 12 continuous months	252,501	261,865
Total securities in a loss position	252,501	261,865
Debt Securities, Held-to-maturity, Unrealized Loss
Less than 12 continuous months	0	0
Greater than or equal to 12 continuous months	(48,474)	(44,396)
Held-to-maturity, gross unrealized losses	(48,474)	(44,396)
Debt Securities, Available-For-Sale, Fair Value
Available-for-sale, less than 12 continuous months, fair value	3	0
Available-for-sale, greater than 12 continuous months, fair value	69,152	72,146
Available-for-sale, total securities in a loss position, fair value	69,155	72,146
Debt Securities, Available-for-sale, Unrealized Loss
Available-for-sale, less than 12 continuous months, unrealized loss	0	0
Available-for-sale, greater than 12 continuous months, unrealized loss	(10,073)	(9,516)
Available-for-sale, total securities in a loss position, unrealized loss	(10,073)	(9,516)
CMOs issued by FHLMC
Debt Securities, Held-to-maturity, Fair Value
Less than 12 continuous months	12,455	8,662
Greater than or equal to 12 continuous months	185,319	188,657
Total securities in a loss position	197,774	197,319
Debt Securities, Held-to-maturity, Unrealized Loss
Less than 12 continuous months	(68)	(21)
Greater than or equal to 12 continuous months	(26,834)	(24,848)
Held-to-maturity, gross unrealized losses	(26,902)	(24,869)
Debt Securities, Available-For-Sale, Fair Value
Available-for-sale, less than 12 continuous months, fair value	958	1,235
Available-for-sale, greater than 12 continuous months, fair value	234,002	240,414
Available-for-sale, total securities in a loss position, fair value	234,960	241,649
Debt Securities, Available-for-sale, Unrealized Loss
Available-for-sale, less than 12 continuous months, unrealized loss	(4)	(7)
Available-for-sale, greater than 12 continuous months, unrealized loss	(26,833)	(24,751)
Available-for-sale, total securities in a loss position, unrealized loss	(26,837)	(24,758)
CMOs issued by FNMA
Debt Securities, Held-to-maturity, Fair Value
Less than 12 continuous months	40,962	42,474
Greater than or equal to 12 continuous months	51,980	54,249
Total securities in a loss position	92,942	96,723
Debt Securities, Held-to-maturity, Unrealized Loss
Less than 12 continuous months	(1,054)	(411)
Greater than or equal to 12 continuous months	(4,955)	(4,368)
Held-to-maturity, gross unrealized losses	(6,009)	(4,779)
Debt Securities, Available-For-Sale, Fair Value
Available-for-sale, less than 12 continuous months, fair value	0	0
Available-for-sale, greater than 12 continuous months, fair value	20,264	21,272
Available-for-sale, total securities in a loss position, fair value	20,264	21,272
Debt Securities, Available-for-sale, Unrealized Loss
Available-for-sale, less than 12 continuous months, unrealized loss	0	0
Available-for-sale, greater than 12 continuous months, unrealized loss	(2,835)	(2,715)
Available-for-sale, total securities in a loss position, unrealized loss	(2,835)	(2,715)
CMOs issued by GNMA
Debt Securities, Held-to-maturity, Fair Value
Less than 12 continuous months	10,808	10,988
Greater than or equal to 12 continuous months	34,452	34,783
Total securities in a loss position	45,260	45,771
Debt Securities, Held-to-maturity, Unrealized Loss
Less than 12 continuous months	(350)	(244)
Greater than or equal to 12 continuous months	(5,086)	(4,991)
Held-to-maturity, gross unrealized losses	(5,436)	(5,235)
Debt Securities, Available-For-Sale, Fair Value
Available-for-sale, less than 12 continuous months, fair value	0	0
Available-for-sale, greater than 12 continuous months, fair value	16,295	17,128
Available-for-sale, total securities in a loss position, fair value	16,295	17,128
Debt Securities, Available-for-sale, Unrealized Loss
Available-for-sale, less than 12 continuous months, unrealized loss	0	0
Available-for-sale, greater than 12 continuous months, unrealized loss	(3,191)	(2,878)
Available-for-sale, total securities in a loss position, unrealized loss	(3,191)	(2,878)
SBA-backed securities
Debt Securities, Held-to-maturity, Fair Value
Less than 12 continuous months	0	0
Greater than or equal to 12 continuous months	1,556	1,763
Total securities in a loss position	1,556	1,763
Debt Securities, Held-to-maturity, Unrealized Loss
Less than 12 continuous months	0	0
Greater than or equal to 12 continuous months	(95)	(90)
Held-to-maturity, gross unrealized losses	(95)	(90)
Debt Securities, Available-For-Sale, Fair Value
Available-for-sale, less than 12 continuous months, fair value	0	0
Available-for-sale, greater than 12 continuous months, fair value	17,148	19,471
Available-for-sale, total securities in a loss position, fair value	17,148	19,471
Debt Securities, Available-for-sale, Unrealized Loss
Available-for-sale, less than 12 continuous months, unrealized loss	0	0
Available-for-sale, greater than 12 continuous months, unrealized loss	(1,657)	(1,655)
Available-for-sale, total securities in a loss position, unrealized loss	(1,657)	(1,655)
Debentures of government- sponsored agencies
Debt Securities, Held-to-maturity, Fair Value
Less than 12 continuous months	0	0
Greater than or equal to 12 continuous months	123,260	124,132
Total securities in a loss position	123,260	124,132
Debt Securities, Held-to-maturity, Unrealized Loss
Less than 12 continuous months	0	0
Greater than or equal to 12 continuous months	(22,942)	(21,994)
Held-to-maturity, gross unrealized losses	(22,942)	(21,994)
Debt Securities, Available-For-Sale, Fair Value
Available-for-sale, less than 12 continuous months, fair value	0	0
Available-for-sale, greater than 12 continuous months, fair value	66,688	66,862
Available-for-sale, total securities in a loss position, fair value	66,688	66,862
Debt Securities, Available-for-sale, Unrealized Loss
Available-for-sale, less than 12 continuous months, unrealized loss	0	0
Available-for-sale, greater than 12 continuous months, unrealized loss	(7,218)	(7,037)
Available-for-sale, total securities in a loss position, unrealized loss	(7,218)	(7,037)
U.S. Treasury securities
Debt Securities, Available-For-Sale, Fair Value
Available-for-sale, less than 12 continuous months, fair value	0	0
Available-for-sale, greater than 12 continuous months, fair value	10,534	10,623
Available-for-sale, total securities in a loss position, fair value	10,534	10,623
Debt Securities, Available-for-sale, Unrealized Loss
Available-for-sale, less than 12 continuous months, unrealized loss	0	0
Available-for-sale, greater than 12 continuous months, unrealized loss	(1,394)	(1,300)
Available-for-sale, total securities in a loss position, unrealized loss	(1,394)	(1,300)
Obligations of state and political subdivisions
Debt Securities, Held-to-maturity, Fair Value
Less than 12 continuous months	6,589	0
Greater than or equal to 12 continuous months	44,242	44,437
Total securities in a loss position	50,831	44,437
Debt Securities, Held-to-maturity, Unrealized Loss
Less than 12 continuous months	(46)	0
Greater than or equal to 12 continuous months	(7,976)	(7,884)
Held-to-maturity, gross unrealized losses	(8,022)	(7,884)
Debt Securities, Available-For-Sale, Fair Value
Available-for-sale, less than 12 continuous months, fair value	557	666
Available-for-sale, greater than 12 continuous months, fair value	89,786	90,655
Available-for-sale, total securities in a loss position, fair value	90,343	91,321
Debt Securities, Available-for-sale, Unrealized Loss
Available-for-sale, less than 12 continuous months, unrealized loss	(2)	(1)
Available-for-sale, greater than 12 continuous months, unrealized loss	(11,566)	(10,320)
Available-for-sale, total securities in a loss position, unrealized loss	(11,568)	(10,321)
Corporate bonds
Debt Securities, Held-to-maturity, Fair Value
Less than 12 continuous months	0	0
Greater than or equal to 12 continuous months	28,717	28,804
Total securities in a loss position	28,717	28,804
Debt Securities, Held-to-maturity, Unrealized Loss
Less than 12 continuous months	0	0
Greater than or equal to 12 continuous months	(1,283)	(1,196)
Held-to-maturity, gross unrealized losses	(1,283)	(1,196)
Debt Securities, Available-For-Sale, Fair Value
Available-for-sale, less than 12 continuous months, fair value	0	0
Available-for-sale, greater than 12 continuous months, fair value	10,744	10,718
Available-for-sale, total securities in a loss position, fair value	10,744	10,718
Debt Securities, Available-for-sale, Unrealized Loss
Available-for-sale, less than 12 continuous months, unrealized loss	0	0
Available-for-sale, greater than 12 continuous months, unrealized loss	(1,248)	(1,274)
Available-for-sale, total securities in a loss position, unrealized loss	$ (1,248)	$ (1,274)

Investment Securities - Non-Marketable Securities Included in Other Assets (Details) - USD ($)	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023	Apr. 25, 2024	Dec. 31, 2023
Schedule of Equity Method Investments [Line Items]
Federal home loan bank stock, par value (in usd per share)	$ 100
Investments in low income housing tax credit funds	$ 1,900,000			$ 2,000,000
Low income housing tax credits and other tax benefits	133,000
Low income housing amortization expense	111,000
Unfunded commitments for low income housing tax credit funds	343,000
Impairment losses	0	$ 0
Subsequent event
Schedule of Equity Method Investments [Line Items]
Federal home loan bank, dividend rate percentage			8.25%
Asset derivatives
Schedule of Equity Method Investments [Line Items]
Federal home loan bank stock	$ 16,700,000			$ 16,700,000

Loans and Allowance for Credit Losses on Loans - Schedule of Loans by Class (Details) - USD ($) $ in Thousands	Mar. 31, 2024	Dec. 31, 2023	Mar. 31, 2023	Dec. 31, 2022
Financing Receivable, Allowance for Credit Loss [Line Items]
Loans, at amortized cost	$ 2,054,963	$ 2,073,720
Allowance for credit losses on loans	(25,501)	(25,172)	$ (23,330)	$ (22,983)
Loans, net of allowance for credit losses on loans	2,029,462	2,048,548
Net deferred loan origination costs	2,600	2,700
Unrecognized purchase discounts on non-PCI loans	1,900	2,000
Financing receivable, accrued interest, net	$ 6,300	$ 6,600
Financing Receivable, Accrued Interest, after Allowance for Credit Loss, Statement of Financial Position [Extensible Enumeration]	Interest receivable and other assets	Interest receivable and other assets
Commercial loans \| Commercial and industrial
Financing Receivable, Allowance for Credit Loss [Line Items]
Loans, at amortized cost	$ 150,896	$ 153,750
Allowance for credit losses on loans	(1,727)	(1,712)	(1,941)	(1,794)
Commercial real estate loans \| Commercial owner-occupied
Financing Receivable, Allowance for Credit Loss [Line Items]
Loans, at amortized cost	328,560	333,181
Allowance for credit losses on loans	(2,500)	(2,476)	(2,640)	(2,487)
Commercial real estate loans \| Commercial non-owner occupied
Financing Receivable, Allowance for Credit Loss [Line Items]
Loans, at amortized cost	1,236,633	1,219,385
Allowance for credit losses on loans	(15,704)	(14,933)	(12,701)	(12,676)
Commercial real estate loans \| Construction
Financing Receivable, Allowance for Credit Loss [Line Items]
Loans, at amortized cost	71,494	99,164
Allowance for credit losses on loans	(1,282)	(1,832)	(2,019)	(1,937)
Residential loans \| Home equity
Financing Receivable, Allowance for Credit Loss [Line Items]
Loans, at amortized cost	86,794	82,087
Allowance for credit losses on loans	(627)	(552)	(538)	(558)
Residential loans \| Other residential
Financing Receivable, Allowance for Credit Loss [Line Items]
Loans, at amortized cost	113,479	118,508
Allowance for credit losses on loans	(692)	(653)	(577)	(595)
Consumer loans \| Installment and other consumer loans
Financing Receivable, Allowance for Credit Loss [Line Items]
Loans, at amortized cost	67,107	67,645
Allowance for credit losses on loans	$ (920)	$ (976)	$ (882)	$ (868)

Loans and Allowance for Credit Losses on Loans - Schedule of Loans by Risk Grade and Origination Year (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023	Dec. 31, 2023
Financing Receivable, Credit Quality Indicator [Line Items]
Financing receivable, originated, year one	$ 43,724		$ 183,397
Financing receivable, originated, year two	173,241		291,859
Financing receivable, originated, year three	282,725		320,078
Financing receivable, originated, year four	297,858		264,689
Financing receivable, originated, year five	262,668		239,856
Prior	824,227		610,122
Revolving Loans Amortized Cost	170,520		163,719
Total	2,054,963		2,073,720
Gross current period charge-offs, originated, year one	0
Gross current period charge-offs, originated, year two	(14)
Gross current period charge-offs, originated, year three	0
Gross current period charge-offs, originated, year four	(3)
Gross current period charge-offs, originated, year five	0
Gross current period charge-offs, originated, prior	0
Gross current period charge-offs, originated, revolving loans amortized cost	(4)
Gross current period charge-offs, originated, total	(21)	$ (14)
Pass and Watch
Financing Receivable, Credit Quality Indicator [Line Items]
Financing receivable, originated, year one	43,364		168,498
Financing receivable, originated, year two	159,169		282,068
Financing receivable, originated, year three	277,748		292,740
Financing receivable, originated, year four	271,743		252,093
Financing receivable, originated, year five	250,156		222,217
Prior	736,094		534,401
Revolving Loans Amortized Cost	160,942		154,208
Total	1,899,216		1,906,225
Special Mention
Financing Receivable, Credit Quality Indicator [Line Items]
Financing receivable, originated, year one	0		14,021
Financing receivable, originated, year two	13,200		7,288
Financing receivable, originated, year three	2,776		25,134
Financing receivable, originated, year four	23,800		12,596
Financing receivable, originated, year five	12,512		16,328
Prior	47,216		50,504
Revolving Loans Amortized Cost	1,443		9,300
Total	100,947		135,171
Substandard
Financing Receivable, Credit Quality Indicator [Line Items]
Financing receivable, originated, year one	360		878
Financing receivable, originated, year two	872		2,503
Financing receivable, originated, year three	2,201		2,204
Financing receivable, originated, year four	2,315		0
Financing receivable, originated, year five	0		1,311
Prior	40,917		25,217
Revolving Loans Amortized Cost	8,135		211
Total	54,800		32,324
Commercial loans \| Commercial and industrial
Financing Receivable, Credit Quality Indicator [Line Items]
Financing receivable, originated, year one	2,650		25,615
Financing receivable, originated, year two	23,105		9,187
Financing receivable, originated, year three	9,107		2,970
Financing receivable, originated, year four	2,726		3,718
Financing receivable, originated, year five	3,474		16,773
Prior	36,195		23,701
Revolving Loans Amortized Cost	73,639		71,786
Total	150,896		153,750
Gross current period charge-offs, originated, year one	0
Gross current period charge-offs, originated, year two	0
Gross current period charge-offs, originated, year three	0
Gross current period charge-offs, originated, year four	0
Gross current period charge-offs, originated, year five	0
Gross current period charge-offs, originated, prior	0
Gross current period charge-offs, originated, revolving loans amortized cost	(4)
Gross current period charge-offs, originated, total	(4)	(3)
Commercial loans \| Commercial and industrial \| Pass and Watch
Financing Receivable, Credit Quality Indicator [Line Items]
Financing receivable, originated, year one	2,650		25,615
Financing receivable, originated, year two	23,105		9,187
Financing receivable, originated, year three	9,107		2,970
Financing receivable, originated, year four	2,726		3,718
Financing receivable, originated, year five	3,474		15,128
Prior	33,698		21,004
Revolving Loans Amortized Cost	64,683		62,486
Total	139,443		140,108
Commercial loans \| Commercial and industrial \| Special Mention
Financing Receivable, Credit Quality Indicator [Line Items]
Financing receivable, originated, year one	0		0
Financing receivable, originated, year two	0		0
Financing receivable, originated, year three	0		0
Financing receivable, originated, year four	0		0
Financing receivable, originated, year five	0		334
Prior	306		0
Revolving Loans Amortized Cost	1,443		9,300
Total	1,749		9,634
Commercial loans \| Commercial and industrial \| Substandard
Financing Receivable, Credit Quality Indicator [Line Items]
Financing receivable, originated, year one	0		0
Financing receivable, originated, year two	0		0
Financing receivable, originated, year three	0		0
Financing receivable, originated, year four	0		0
Financing receivable, originated, year five	0		1,311
Prior	2,191		2,697
Revolving Loans Amortized Cost	7,513		0
Total	9,704		4,008
Commercial real estate loans \| Commercial owner-occupied
Financing Receivable, Credit Quality Indicator [Line Items]
Financing receivable, originated, year one	3,187		14,559
Financing receivable, originated, year two	14,439		48,537
Financing receivable, originated, year three	48,149		65,523
Financing receivable, originated, year four	64,997		38,528
Financing receivable, originated, year five	36,978		41,280
Prior	160,805		124,698
Revolving Loans Amortized Cost	5		56
Total	328,560		333,181
Gross current period charge-offs, originated, total	0	0
Commercial real estate loans \| Commercial owner-occupied \| Pass and Watch
Financing Receivable, Credit Quality Indicator [Line Items]
Financing receivable, originated, year one	3,187		13,128
Financing receivable, originated, year two	14,053		41,808
Financing receivable, originated, year three	45,948		49,887
Financing receivable, originated, year four	49,506		37,708
Financing receivable, originated, year five	36,162		40,994
Prior	148,036		114,018
Revolving Loans Amortized Cost	5		56
Total	296,897		297,599
Commercial real estate loans \| Commercial owner-occupied \| Special Mention
Financing Receivable, Credit Quality Indicator [Line Items]
Financing receivable, originated, year one	0		1,431
Financing receivable, originated, year two	386		4,498
Financing receivable, originated, year three	0		15,636
Financing receivable, originated, year four	15,491		820
Financing receivable, originated, year five	816		286
Prior	10,113		8,902
Revolving Loans Amortized Cost	0		0
Total	26,806		31,573
Commercial real estate loans \| Commercial owner-occupied \| Substandard
Financing Receivable, Credit Quality Indicator [Line Items]
Financing receivable, originated, year one	0		0
Financing receivable, originated, year two	0		2,231
Financing receivable, originated, year three	2,201		0
Financing receivable, originated, year four	0		0
Financing receivable, originated, year five	0		0
Prior	2,656		1,778
Revolving Loans Amortized Cost	0		0
Total	4,857		4,009
Commercial real estate loans \| Commercial non-owner occupied
Financing Receivable, Credit Quality Indicator [Line Items]
Financing receivable, originated, year one	20,511		77,596
Financing receivable, originated, year two	77,338		175,090
Financing receivable, originated, year three	173,896		208,042
Financing receivable, originated, year four	206,570		162,607
Financing receivable, originated, year five	172,955		155,568
Prior	575,261		430,650
Revolving Loans Amortized Cost	10,102		9,832
Total	1,236,633		1,219,385
Gross current period charge-offs, originated, total	0	0
Commercial real estate loans \| Commercial non-owner occupied \| Pass and Watch
Financing Receivable, Credit Quality Indicator [Line Items]
Financing receivable, originated, year one	20,233		76,718
Financing receivable, originated, year two	76,466		172,028
Financing receivable, originated, year three	171,120		196,340
Financing receivable, originated, year four	196,087		150,831
Financing receivable, originated, year five	161,259		139,860
Prior	502,571		368,675
Revolving Loans Amortized Cost	10,102		9,832
Total	1,137,838		1,114,284
Commercial real estate loans \| Commercial non-owner occupied \| Special Mention
Financing Receivable, Credit Quality Indicator [Line Items]
Financing receivable, originated, year one	0		0
Financing receivable, originated, year two	0		2,790
Financing receivable, originated, year three	2,776		9,498
Financing receivable, originated, year four	8,309		11,776
Financing receivable, originated, year five	11,696		15,708
Prior	36,797		41,602
Revolving Loans Amortized Cost	0		0
Total	59,578		81,374
Commercial real estate loans \| Commercial non-owner occupied \| Substandard
Financing Receivable, Credit Quality Indicator [Line Items]
Financing receivable, originated, year one	278		878
Financing receivable, originated, year two	872		272
Financing receivable, originated, year three	0		2,204
Financing receivable, originated, year four	2,174		0
Financing receivable, originated, year five	0		0
Prior	35,893		20,373
Revolving Loans Amortized Cost	0		0
Total	39,217		23,727
Commercial real estate loans \| Construction
Financing Receivable, Credit Quality Indicator [Line Items]
Financing receivable, originated, year one	13,915		25,728
Financing receivable, originated, year two	20,475		24,403
Financing receivable, originated, year three	17,794		19,521
Financing receivable, originated, year four	0		29,512
Financing receivable, originated, year five	19,310		0
Prior	0		0
Revolving Loans Amortized Cost	0		0
Total	71,494		99,164
Gross current period charge-offs, originated, total	0	0
Commercial real estate loans \| Construction \| Pass and Watch
Financing Receivable, Credit Quality Indicator [Line Items]
Financing receivable, originated, year one	13,915		13,138
Financing receivable, originated, year two	7,661		24,403
Financing receivable, originated, year three	17,794		19,521
Financing receivable, originated, year four	0		29,512
Financing receivable, originated, year five	19,310		0
Prior	0		0
Revolving Loans Amortized Cost	0		0
Total	58,680		86,574
Commercial real estate loans \| Construction \| Special Mention
Financing Receivable, Credit Quality Indicator [Line Items]
Financing receivable, originated, year one	0		12,590
Financing receivable, originated, year two	12,814		0
Financing receivable, originated, year three	0		0
Financing receivable, originated, year four	0		0
Financing receivable, originated, year five	0		0
Prior	0		0
Revolving Loans Amortized Cost	0		0
Total	12,814		12,590
Residential loans \| Home equity
Financing Receivable, Credit Quality Indicator [Line Items]
Financing receivable, originated, year one	82		0
Financing receivable, originated, year two	0		0
Financing receivable, originated, year three	0		0
Financing receivable, originated, year four	0		0
Financing receivable, originated, year five	0		0
Prior	941		1,103
Revolving Loans Amortized Cost	85,771		80,984
Total	86,794		82,087
Gross current period charge-offs, originated, total	0	0
Residential loans \| Home equity \| Pass and Watch
Financing Receivable, Credit Quality Indicator [Line Items]
Financing receivable, originated, year one	0		0
Financing receivable, originated, year two	0		0
Financing receivable, originated, year three	0		0
Financing receivable, originated, year four	0		0
Financing receivable, originated, year five	0		0
Prior	764		734
Revolving Loans Amortized Cost	85,149		80,773
Total	85,913		81,507
Residential loans \| Home equity \| Substandard
Financing Receivable, Credit Quality Indicator [Line Items]
Financing receivable, originated, year one	82		0
Financing receivable, originated, year two	0		0
Financing receivable, originated, year three	0		0
Financing receivable, originated, year four	0		0
Financing receivable, originated, year five	0		0
Prior	177		369
Revolving Loans Amortized Cost	622		211
Total	881		580
Residential loans \| Other residential
Financing Receivable, Credit Quality Indicator [Line Items]
Financing receivable, originated, year one	0		17,861
Financing receivable, originated, year two	17,765		20,114
Financing receivable, originated, year three	20,010		13,390
Financing receivable, originated, year four	13,295		25,637
Financing receivable, originated, year five	25,462		20,935
Prior	36,947		20,571
Revolving Loans Amortized Cost	0		0
Total	113,479		118,508
Gross current period charge-offs, originated, total	0	0
Residential loans \| Other residential \| Pass and Watch
Financing Receivable, Credit Quality Indicator [Line Items]
Financing receivable, originated, year one	0		17,861
Financing receivable, originated, year two	17,765		20,114
Financing receivable, originated, year three	20,010		13,390
Financing receivable, originated, year four	13,295		25,637
Financing receivable, originated, year five	25,462		20,935
Prior	36,947		20,571
Revolving Loans Amortized Cost	0		0
Total	113,479		118,508
Consumer loans \| Installment and other consumer loans
Financing Receivable, Credit Quality Indicator [Line Items]
Financing receivable, originated, year one	3,379		22,038
Financing receivable, originated, year two	20,119		14,528
Financing receivable, originated, year three	13,769		10,632
Financing receivable, originated, year four	10,270		4,687
Financing receivable, originated, year five	4,489		5,300
Prior	14,078		9,399
Revolving Loans Amortized Cost	1,003		1,061
Total	67,107		67,645
Gross current period charge-offs, originated, year one	0
Gross current period charge-offs, originated, year two	(14)
Gross current period charge-offs, originated, year three	0
Gross current period charge-offs, originated, year four	(3)
Gross current period charge-offs, originated, year five	0
Gross current period charge-offs, originated, prior	0
Gross current period charge-offs, originated, revolving loans amortized cost	0
Gross current period charge-offs, originated, total	(17)	$ (11)
Consumer loans \| Installment and other consumer loans \| Pass and Watch
Financing Receivable, Credit Quality Indicator [Line Items]
Financing receivable, originated, year one	3,379		22,038
Financing receivable, originated, year two	20,119		14,528
Financing receivable, originated, year three	13,769		10,632
Financing receivable, originated, year four	10,129		4,687
Financing receivable, originated, year five	4,489		5,300
Prior	14,078		9,399
Revolving Loans Amortized Cost	1,003		1,061
Total	66,966		$ 67,645
Consumer loans \| Installment and other consumer loans \| Substandard
Financing Receivable, Credit Quality Indicator [Line Items]
Financing receivable, originated, year one	0
Financing receivable, originated, year two	0
Financing receivable, originated, year three	0
Financing receivable, originated, year four	141
Financing receivable, originated, year five	0
Prior	0
Revolving Loans Amortized Cost	0
Total	$ 141

Loans and Allowance for Credit Losses on Loans - Schedule of Loans Outstanding and Aging Analysis (Details)	3 Months Ended
	Mar. 31, 2024 USD ($) loan	Mar. 31, 2023 USD ($)	Dec. 31, 2023 USD ($) loan
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, at amortized cost	$ 2,054,963,000		$ 2,073,720,000
Number of loans 90 days past due and still accruing \| loan			0
Financing receivable, nonaccrual, earning interest on cash basis	0		$ 0
Nonaccrual interest income reversal	10,000	$ 16,000
Financial asset, other than financial asset acquired with credit deterioration
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, at amortized cost	2,054,963,000		2,073,720,000
Non-accrual loans	6,295,000		7,992,000
Non-accrual loans with no allowance	1,902,000		3,091,000
Total past due \| Financial asset, other than financial asset acquired with credit deterioration
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, at amortized cost	13,257,000		7,664,000
30-59 days past due \| Financial asset, other than financial asset acquired with credit deterioration
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, at amortized cost	2,406,000		3,930,000
60-89 days past due \| Financial asset, other than financial asset acquired with credit deterioration
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, at amortized cost	390,000		2,274,000
90 days or more past due \| Financial asset, other than financial asset acquired with credit deterioration
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, at amortized cost	10,461,000		1,460,000
Current \| Financial asset, other than financial asset acquired with credit deterioration
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, at amortized cost	2,041,706,000		2,066,056,000
Commercial loans \| Commercial and industrial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, at amortized cost	150,896,000		153,750,000
Commercial loans \| Commercial and industrial \| Financial asset, other than financial asset acquired with credit deterioration
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, at amortized cost	150,896,000		153,750,000
Non-accrual loans	2,220,000		4,008,000
Non-accrual loans with no allowance	0		1,311,000
Commercial loans \| Commercial and industrial \| Total past due \| Financial asset, other than financial asset acquired with credit deterioration
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, at amortized cost	432,000		4,371,000
Commercial loans \| Commercial and industrial \| 30-59 days past due \| Financial asset, other than financial asset acquired with credit deterioration
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, at amortized cost	13,000		2,991,000
Commercial loans \| Commercial and industrial \| 60-89 days past due \| Financial asset, other than financial asset acquired with credit deterioration
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, at amortized cost	390,000		69,000
Commercial loans \| Commercial and industrial \| 90 days or more past due \| Financial asset, other than financial asset acquired with credit deterioration
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, at amortized cost	29,000		1,311,000
Commercial loans \| Commercial and industrial \| Current \| Financial asset, other than financial asset acquired with credit deterioration
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, at amortized cost	150,464,000		149,379,000
Commercial real estate loans \| Commercial owner-occupied
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, at amortized cost	328,560,000		333,181,000
Commercial real estate loans \| Commercial owner-occupied \| Financial asset, other than financial asset acquired with credit deterioration
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, at amortized cost	328,560,000		333,181,000
Non-accrual loans	416,000		434,000
Non-accrual loans with no allowance	416,000		434,000
Commercial real estate loans \| Commercial owner-occupied \| Total past due \| Financial asset, other than financial asset acquired with credit deterioration
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, at amortized cost	241,000		767,000
Commercial real estate loans \| Commercial owner-occupied \| 30-59 days past due \| Financial asset, other than financial asset acquired with credit deterioration
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, at amortized cost	101,000		618,000
Commercial real estate loans \| Commercial owner-occupied \| 60-89 days past due \| Financial asset, other than financial asset acquired with credit deterioration
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, at amortized cost	0		0
Commercial real estate loans \| Commercial owner-occupied \| 90 days or more past due \| Financial asset, other than financial asset acquired with credit deterioration
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, at amortized cost	140,000		149,000
Commercial real estate loans \| Commercial owner-occupied \| Current \| Financial asset, other than financial asset acquired with credit deterioration
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, at amortized cost	328,319,000		332,414,000
Commercial real estate loans \| Commercial non-owner occupied
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, at amortized cost	1,236,633,000		1,219,385,000
Commercial real estate loans \| Commercial non-owner occupied \| Financial asset, other than financial asset acquired with credit deterioration
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, at amortized cost	1,236,633,000		1,219,385,000
Non-accrual loans	3,045,000		3,081,000
Non-accrual loans with no allowance	872,000		877,000
Commercial real estate loans \| Commercial non-owner occupied \| Total past due \| Financial asset, other than financial asset acquired with credit deterioration
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, at amortized cost	11,164,000		2,204,000
Commercial real estate loans \| Commercial non-owner occupied \| 30-59 days past due \| Financial asset, other than financial asset acquired with credit deterioration
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, at amortized cost	872,000		0
Commercial real estate loans \| Commercial non-owner occupied \| 60-89 days past due \| Financial asset, other than financial asset acquired with credit deterioration
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, at amortized cost	$ 0		2,204,000
Commercial real estate loans \| Commercial non-owner occupied \| 90 days or more past due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of loans 90 days past due and still accruing \| loan	1
Commercial real estate loans \| Commercial non-owner occupied \| 90 days or more past due \| Financial asset, other than financial asset acquired with credit deterioration
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, at amortized cost	$ 10,292,000		0
Commercial real estate loans \| Commercial non-owner occupied \| Current \| Financial asset, other than financial asset acquired with credit deterioration
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, at amortized cost	1,225,469,000		1,217,181,000
Commercial real estate loans \| Construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, at amortized cost	71,494,000		99,164,000
Commercial real estate loans \| Construction \| Financial asset, other than financial asset acquired with credit deterioration
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, at amortized cost	71,494,000		99,164,000
Non-accrual loans	0		0
Non-accrual loans with no allowance	0		0
Commercial real estate loans \| Construction \| Total past due \| Financial asset, other than financial asset acquired with credit deterioration
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, at amortized cost	1,057,000		0
Commercial real estate loans \| Construction \| 30-59 days past due \| Financial asset, other than financial asset acquired with credit deterioration
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, at amortized cost	1,057,000		0
Commercial real estate loans \| Construction \| 60-89 days past due \| Financial asset, other than financial asset acquired with credit deterioration
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, at amortized cost	0		0
Commercial real estate loans \| Construction \| 90 days or more past due \| Financial asset, other than financial asset acquired with credit deterioration
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, at amortized cost	0		0
Commercial real estate loans \| Construction \| Current \| Financial asset, other than financial asset acquired with credit deterioration
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, at amortized cost	70,437,000		99,164,000
Residential loans \| Home equity
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, at amortized cost	86,794,000		82,087,000
Residential loans \| Home equity \| Financial asset, other than financial asset acquired with credit deterioration
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, at amortized cost	86,794,000		82,087,000
Non-accrual loans	473,000		469,000
Non-accrual loans with no allowance	473,000		469,000
Residential loans \| Home equity \| Total past due \| Financial asset, other than financial asset acquired with credit deterioration
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, at amortized cost	360,000		43,000
Residential loans \| Home equity \| 30-59 days past due \| Financial asset, other than financial asset acquired with credit deterioration
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, at amortized cost	360,000		43,000
Residential loans \| Home equity \| 60-89 days past due \| Financial asset, other than financial asset acquired with credit deterioration
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, at amortized cost	0		0
Residential loans \| Home equity \| 90 days or more past due \| Financial asset, other than financial asset acquired with credit deterioration
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, at amortized cost	0		0
Residential loans \| Home equity \| Current \| Financial asset, other than financial asset acquired with credit deterioration
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, at amortized cost	86,434,000		82,044,000
Residential loans \| Other residential
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, at amortized cost	113,479,000		118,508,000
Residential loans \| Other residential \| Financial asset, other than financial asset acquired with credit deterioration
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, at amortized cost	113,479,000		118,508,000
Non-accrual loans	0		0
Non-accrual loans with no allowance	0		0
Residential loans \| Other residential \| Total past due \| Financial asset, other than financial asset acquired with credit deterioration
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, at amortized cost	0		83,000
Residential loans \| Other residential \| 30-59 days past due \| Financial asset, other than financial asset acquired with credit deterioration
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, at amortized cost	0		83,000
Residential loans \| Other residential \| 60-89 days past due \| Financial asset, other than financial asset acquired with credit deterioration
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, at amortized cost	0		0
Residential loans \| Other residential \| 90 days or more past due \| Financial asset, other than financial asset acquired with credit deterioration
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, at amortized cost	0		0
Residential loans \| Other residential \| Current \| Financial asset, other than financial asset acquired with credit deterioration
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, at amortized cost	113,479,000		118,425,000
Consumer loans \| Installment and other consumer loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, at amortized cost	67,107,000		67,645,000
Consumer loans \| Installment and other consumer loans \| Financial asset, other than financial asset acquired with credit deterioration
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, at amortized cost	67,107,000		67,645,000
Non-accrual loans	141,000		0
Non-accrual loans with no allowance	141,000		0
Consumer loans \| Installment and other consumer loans \| Total past due \| Financial asset, other than financial asset acquired with credit deterioration
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, at amortized cost	3,000		196,000
Consumer loans \| Installment and other consumer loans \| 30-59 days past due \| Financial asset, other than financial asset acquired with credit deterioration
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, at amortized cost	3,000		195,000
Consumer loans \| Installment and other consumer loans \| 60-89 days past due \| Financial asset, other than financial asset acquired with credit deterioration
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, at amortized cost	0		1,000
Consumer loans \| Installment and other consumer loans \| 90 days or more past due \| Financial asset, other than financial asset acquired with credit deterioration
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, at amortized cost	0		0
Consumer loans \| Installment and other consumer loans \| Current \| Financial asset, other than financial asset acquired with credit deterioration
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, at amortized cost	$ 67,104,000		$ 67,449,000

Loans and Allowance for Credit Losses on Loans - Schedule of Collateral-Dependent Non-Accrual Loans (Details) - USD ($)	Mar. 31, 2024	Dec. 31, 2023	Mar. 31, 2023	Dec. 31, 2022
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for credit losses	$ 25,501,000	$ 25,172,000	$ 23,330,000	$ 22,983,000
Nonaccrual collateral dependent loans in process of foreclosure	$ 0	$ 0
Weighted average ratio of loans value to collateral dependent loans value	82.00%	70.00%
Collateral Pledged
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non-accrual loans	$ 4,076,000	$ 5,295,000
Allowance for credit losses	496,000	408,000
Commercial Real Estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non-accrual loans	3,462,000	4,826,000
Residential Real Estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non-accrual loans	473,000	469,000
Blanket Lien
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non-accrual loans	0	0
Other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non-accrual loans	141,000	0
Commercial loans \| Commercial and industrial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for credit losses	1,727,000	1,712,000	1,941,000	1,794,000
Commercial loans \| Commercial and industrial \| Collateral Pledged
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non-accrual loans		1,311,000
Allowance for credit losses		0
Commercial loans \| Commercial and industrial \| Commercial Real Estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non-accrual loans		1,311,000
Commercial loans \| Commercial and industrial \| Residential Real Estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non-accrual loans		0
Commercial loans \| Commercial and industrial \| Blanket Lien
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non-accrual loans		0
Commercial loans \| Commercial and industrial \| Other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non-accrual loans		0
Commercial real estate loans \| Commercial owner-occupied
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for credit losses	2,500,000	2,476,000	2,640,000	2,487,000
Commercial real estate loans \| Commercial owner-occupied \| Collateral Pledged
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non-accrual loans	416,000	434,000
Allowance for credit losses	0	0
Commercial real estate loans \| Commercial owner-occupied \| Commercial Real Estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non-accrual loans	416,000	434,000
Commercial real estate loans \| Commercial owner-occupied \| Residential Real Estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non-accrual loans	0	0
Commercial real estate loans \| Commercial owner-occupied \| Blanket Lien
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non-accrual loans	0	0
Commercial real estate loans \| Commercial owner-occupied \| Other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non-accrual loans	0	0
Commercial real estate loans \| Commercial non-owner occupied
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for credit losses	15,704,000	14,933,000	12,701,000	12,676,000
Commercial real estate loans \| Commercial non-owner occupied \| Collateral Pledged
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non-accrual loans	3,046,000	3,081,000
Allowance for credit losses	496,000	408,000
Commercial real estate loans \| Commercial non-owner occupied \| Commercial Real Estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non-accrual loans	3,046,000	3,081,000
Commercial real estate loans \| Commercial non-owner occupied \| Residential Real Estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non-accrual loans	0	0
Commercial real estate loans \| Commercial non-owner occupied \| Blanket Lien
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non-accrual loans	0
Commercial real estate loans \| Commercial non-owner occupied \| Other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non-accrual loans	0	0
Residential loans \| Home equity
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for credit losses	627,000	552,000	538,000	558,000
Residential loans \| Home equity \| Collateral Pledged
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non-accrual loans	473,000	469,000
Allowance for credit losses	0	0
Residential loans \| Home equity \| Commercial Real Estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non-accrual loans	0	0
Residential loans \| Home equity \| Residential Real Estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non-accrual loans	473,000	469,000
Residential loans \| Home equity \| Blanket Lien
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non-accrual loans	0	0
Residential loans \| Home equity \| Other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non-accrual loans	0	0
Consumer loans \| Installment and other consumer loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for credit losses	920,000	$ 976,000	$ 882,000	$ 868,000
Consumer loans \| Installment and other consumer loans \| Collateral Pledged
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non-accrual loans	141,000
Allowance for credit losses	0
Consumer loans \| Installment and other consumer loans \| Commercial Real Estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non-accrual loans	0
Consumer loans \| Installment and other consumer loans \| Residential Real Estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non-accrual loans	0
Consumer loans \| Installment and other consumer loans \| Blanket Lien
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non-accrual loans	0
Consumer loans \| Installment and other consumer loans \| Other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non-accrual loans	$ 141,000

Loans and Allowance for Credit Losses on Loans - Schedule of Amortized Cost Of Loan Modifications (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2024 USD ($)
Financing Receivable, Troubled Debt Restructuring [Line Items]
Total Modifications	$ 2,273
Term Extension
Financing Receivable, Troubled Debt Restructuring [Line Items]
Total Modifications	2,273
Commercial and industrial \| Commercial loans
Financing Receivable, Troubled Debt Restructuring [Line Items]
Total Modifications	2,191
Commercial and industrial \| Term Extension \| Commercial loans
Financing Receivable, Troubled Debt Restructuring [Line Items]
Total Modifications	$ 2,191
Percent of Portfolio Class Total	1.50%
Home equity \| Residential loans
Financing Receivable, Troubled Debt Restructuring [Line Items]
Total Modifications	$ 82
Home equity \| Term Extension \| Residential loans
Financing Receivable, Troubled Debt Restructuring [Line Items]
Total Modifications	$ 82
Percent of Portfolio Class Total	0.10%

Loans and Allowance for Credit Losses on Loans - Schedule of Amortized Cost Of Loans Modifications (Details) - Term Extension	3 Months Ended
	Mar. 31, 2024
Commercial and industrial \| Commercial loans
Financing Receivable, Troubled Debt Restructuring [Line Items]
Weighted-Average Term Extension (in years)	3 months 18 days
Home equity \| Residential loans
Financing Receivable, Troubled Debt Restructuring [Line Items]
Weighted-Average Term Extension (in years)	15 years

Loans and Allowance for Credit Losses on Loans - Schedule of Amortized Cost Of Loan (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2024 USD ($)
Financing Receivable, Troubled Debt Restructuring [Line Items]
Total Modifications	$ 2,273
Non-Accrual	2,273
Total past due
Financing Receivable, Troubled Debt Restructuring [Line Items]
Total Modifications	2,273
30-59 days past due
Financing Receivable, Troubled Debt Restructuring [Line Items]
Total Modifications	0
60-89 days past due
Financing Receivable, Troubled Debt Restructuring [Line Items]
Total Modifications	0
90 days or more past due
Financing Receivable, Troubled Debt Restructuring [Line Items]
Total Modifications	0
Commercial loans \| Commercial and industrial
Financing Receivable, Troubled Debt Restructuring [Line Items]
Total Modifications	2,191
Non-Accrual	2,191
Commercial loans \| Commercial and industrial \| Total past due
Financing Receivable, Troubled Debt Restructuring [Line Items]
Total Modifications	2,191
Commercial loans \| Commercial and industrial \| 30-59 days past due
Financing Receivable, Troubled Debt Restructuring [Line Items]
Total Modifications	0
Commercial loans \| Commercial and industrial \| 60-89 days past due
Financing Receivable, Troubled Debt Restructuring [Line Items]
Total Modifications	0
Commercial loans \| Commercial and industrial \| 90 days or more past due
Financing Receivable, Troubled Debt Restructuring [Line Items]
Total Modifications	0
Residential loans \| Home equity
Financing Receivable, Troubled Debt Restructuring [Line Items]
Total Modifications	82
Non-Accrual	82
Residential loans \| Home equity \| Total past due
Financing Receivable, Troubled Debt Restructuring [Line Items]
Total Modifications	82
Residential loans \| Home equity \| 30-59 days past due
Financing Receivable, Troubled Debt Restructuring [Line Items]
Total Modifications	0
Residential loans \| Home equity \| 90 days or more past due
Financing Receivable, Troubled Debt Restructuring [Line Items]
Total Modifications	$ 0

Loans and Allowance for Credit Losses on Loans - Schedule of Allocation of the Allowance for Credit Losses on Loans (Details) - USD ($) $ in Thousands	Mar. 31, 2024	Dec. 31, 2023	Mar. 31, 2023	Dec. 31, 2022
Financing Receivable, Troubled Debt Restructuring [Line Items]
Allowance for credit losses	$ 25,501	$ 25,172	$ 23,330	$ 22,983
Modeled expected credit losses
Financing Receivable, Troubled Debt Restructuring [Line Items]
Allowance for credit losses	12,013	11,467
Qualitative adjustments
Financing Receivable, Troubled Debt Restructuring [Line Items]
Allowance for credit losses	12,136	12,284
Specific allocations
Financing Receivable, Troubled Debt Restructuring [Line Items]
Allowance for credit losses	1,352	1,421
Commercial loans \| Commercial and industrial
Financing Receivable, Troubled Debt Restructuring [Line Items]
Allowance for credit losses	1,727	1,712	1,941	1,794
Commercial loans \| Commercial and industrial \| Modeled expected credit losses
Financing Receivable, Troubled Debt Restructuring [Line Items]
Allowance for credit losses	940	897
Commercial loans \| Commercial and industrial \| Qualitative adjustments
Financing Receivable, Troubled Debt Restructuring [Line Items]
Allowance for credit losses	628	622
Commercial loans \| Commercial and industrial \| Specific allocations
Financing Receivable, Troubled Debt Restructuring [Line Items]
Allowance for credit losses	159	193
Commercial real estate loans \| Commercial owner-occupied
Financing Receivable, Troubled Debt Restructuring [Line Items]
Allowance for credit losses	2,500	2,476	2,640	2,487
Commercial real estate loans \| Commercial owner-occupied \| Modeled expected credit losses
Financing Receivable, Troubled Debt Restructuring [Line Items]
Allowance for credit losses	1,326	1,270
Commercial real estate loans \| Commercial owner-occupied \| Qualitative adjustments
Financing Receivable, Troubled Debt Restructuring [Line Items]
Allowance for credit losses	1,174	1,205
Commercial real estate loans \| Commercial owner-occupied \| Specific allocations
Financing Receivable, Troubled Debt Restructuring [Line Items]
Allowance for credit losses	0	1
Commercial real estate loans \| Commercial non-owner occupied
Financing Receivable, Troubled Debt Restructuring [Line Items]
Allowance for credit losses	15,704	14,933	12,701	12,676
Commercial real estate loans \| Commercial non-owner occupied \| Modeled expected credit losses
Financing Receivable, Troubled Debt Restructuring [Line Items]
Allowance for credit losses	7,744	7,380
Commercial real estate loans \| Commercial non-owner occupied \| Qualitative adjustments
Financing Receivable, Troubled Debt Restructuring [Line Items]
Allowance for credit losses	6,767	6,327
Commercial real estate loans \| Commercial non-owner occupied \| Specific allocations
Financing Receivable, Troubled Debt Restructuring [Line Items]
Allowance for credit losses	1,193	1,226
Commercial real estate loans \| Construction
Financing Receivable, Troubled Debt Restructuring [Line Items]
Allowance for credit losses	1,282	1,832	2,019	1,937
Commercial real estate loans \| Construction \| Modeled expected credit losses
Financing Receivable, Troubled Debt Restructuring [Line Items]
Allowance for credit losses	119	185
Commercial real estate loans \| Construction \| Qualitative adjustments
Financing Receivable, Troubled Debt Restructuring [Line Items]
Allowance for credit losses	1,163	1,647
Commercial real estate loans \| Construction \| Specific allocations
Financing Receivable, Troubled Debt Restructuring [Line Items]
Allowance for credit losses	0	0
Residential loans \| Home equity
Financing Receivable, Troubled Debt Restructuring [Line Items]
Allowance for credit losses	627	552	538	558
Residential loans \| Home equity \| Modeled expected credit losses
Financing Receivable, Troubled Debt Restructuring [Line Items]
Allowance for credit losses	559	482
Residential loans \| Home equity \| Qualitative adjustments
Financing Receivable, Troubled Debt Restructuring [Line Items]
Allowance for credit losses	68	70
Residential loans \| Home equity \| Specific allocations
Financing Receivable, Troubled Debt Restructuring [Line Items]
Allowance for credit losses	0	0
Residential loans \| Other residential
Financing Receivable, Troubled Debt Restructuring [Line Items]
Allowance for credit losses	692	653	577	595
Residential loans \| Other residential \| Modeled expected credit losses
Financing Receivable, Troubled Debt Restructuring [Line Items]
Allowance for credit losses	670	619
Residential loans \| Other residential \| Qualitative adjustments
Financing Receivable, Troubled Debt Restructuring [Line Items]
Allowance for credit losses	22	33
Residential loans \| Other residential \| Specific allocations
Financing Receivable, Troubled Debt Restructuring [Line Items]
Allowance for credit losses	0	1
Consumer loans \| Installment and other consumer loans
Financing Receivable, Troubled Debt Restructuring [Line Items]
Allowance for credit losses	920	976	882	868
Consumer loans \| Installment and other consumer loans \| Modeled expected credit losses
Financing Receivable, Troubled Debt Restructuring [Line Items]
Allowance for credit losses	655	634
Consumer loans \| Installment and other consumer loans \| Qualitative adjustments
Financing Receivable, Troubled Debt Restructuring [Line Items]
Allowance for credit losses	265	342
Consumer loans \| Installment and other consumer loans \| Specific allocations
Financing Receivable, Troubled Debt Restructuring [Line Items]
Allowance for credit losses	0	0
Unallocated
Financing Receivable, Troubled Debt Restructuring [Line Items]
Allowance for credit losses	2,049	2,038	$ 2,032	$ 2,068
Unallocated \| Modeled expected credit losses
Financing Receivable, Troubled Debt Restructuring [Line Items]
Allowance for credit losses	0	0
Unallocated \| Qualitative adjustments
Financing Receivable, Troubled Debt Restructuring [Line Items]
Allowance for credit losses	2,049	2,038
Unallocated \| Specific allocations
Financing Receivable, Troubled Debt Restructuring [Line Items]
Allowance for credit losses	$ 0	$ 0

Loans and Allowance for Credit Losses on Loans - Schedule of Allowance for Credit Losses on Loans (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2024	Dec. 31, 2023	Mar. 31, 2023
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	$ 25,172		$ 22,983
(Reversal) Provision	350	$ 1,300	350
(Charge-offs)	(21)		(14)
Recoveries	0		11
Ending balance	25,501	25,172	23,330
Commercial loans \| Commercial and industrial
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	1,712		1,794
(Reversal) Provision	19		147
(Charge-offs)	(4)		(3)
Recoveries	0		3
Ending balance	1,727	1,712	1,941
Commercial real estate loans \| Commercial owner-occupied
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	2,476		2,487
(Reversal) Provision	24		153
(Charge-offs)	0		0
Recoveries	0		0
Ending balance	2,500	2,476	2,640
Commercial real estate loans \| Commercial non-owner occupied
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	14,933		12,676
(Reversal) Provision	771		25
(Charge-offs)	0		0
Recoveries	0		0
Ending balance	15,704	14,933	12,701
Commercial real estate loans \| Construction
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	1,832		1,937
(Reversal) Provision	(550)		74
(Charge-offs)	0		0
Recoveries	0		8
Ending balance	1,282	1,832	2,019
Residential loans \| Home equity
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	552		558
(Reversal) Provision	75		(20)
(Charge-offs)	0		0
Recoveries	0		0
Ending balance	627	552	538
Residential loans \| Other residential
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	653		595
(Reversal) Provision	39		(18)
(Charge-offs)	0		0
Recoveries	0		0
Ending balance	692	653	577
Consumer loans \| Installment and other consumer loans
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	976		868
(Reversal) Provision	(39)		25
(Charge-offs)	(17)		(11)
Recoveries	0		0
Ending balance	920	976	882
Unallocated
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	2,038		2,068
(Reversal) Provision	11		(36)
(Charge-offs)	0		0
Recoveries	0		0
Ending balance	$ 2,049	$ 2,038	$ 2,032

Loans and Allowance for Credit Losses on Loans - Pledged Loans (Details) - USD ($) $ in Millions	Mar. 31, 2024	Dec. 31, 2023
Other residential \| Federal Reserve Bank
Financial Instruments Owned and Pledged as Collateral [Line Items]
Collateral pledged	$ 108.5	$ 110.4
Federal Home Loan Bank of San Francisco
Financial Instruments Owned and Pledged as Collateral [Line Items]
Collateral pledged	$ 1,299.0	$ 1,288.0

Loans and Allowance for Credit Losses on Loans - Related Party (Details) - Related Party - USD ($) $ in Thousands	Mar. 31, 2024	Dec. 31, 2023
Related Party Transaction [Line Items]
Related party loans	$ 5,800	$ 5,800
Undisbursed commitment to related parties	$ 212	$ 212

Borrowings and Other Obligations - Lines of Credit (Details) - Line of credit - USD ($) $ in Millions	Mar. 31, 2024	Dec. 31, 2023
FHLB short-term borrowings
Line of Credit Facility [Line Items]
Lines of credit	$ 951.2	$ 1,009.0
Federal reserve bank of san francisco \| FRBSF short-term borrowings under the BTFP
Line of Credit Facility [Line Items]
Lines of credit	350.0
Federal reserve line of credit
Line of Credit Facility [Line Items]
Lines of credit		64.0
Federal reserve line of credit \| FRBSF short-term borrowings under the BTFP
Line of Credit Facility [Line Items]
Lines of credit		270.2
Unsecured debt \| FRBSF federal funds purchased
Line of Credit Facility [Line Items]
Lines of credit	$ 125.0	$ 135.0

Borrowings and Other Obligations- Other Obligations (Details) - USD ($) $ in Thousands	Mar. 31, 2024	Dec. 31, 2023
Debt Disclosure [Abstract]
Finance lease liabilities	$ 260	$ 298
Finance lease, liability, statement of financial position [Extensible List]	Debt and Lease Obligation	Debt and Lease Obligation

Borrowings and Other Obligations - Schedule of Borrowings (Details) - USD ($) $ in Thousands	Mar. 31, 2024	Dec. 31, 2023
Line of Credit Facility [Line Items]
Finance lease liabilities	$ 260	$ 298
Borrowings and other obligations	$ 260	$ 26,298
Weighted Average Rate	2.14%	1.88%
Weighted Average Rate	2.14%	5.26%
Line of credit \| Federal funds lines of credit
Line of Credit Facility [Line Items]
Carrying Value	$ 0	$ 0
Weighted Average Rate	0.00%	0.00%
Line of credit \| FRBSF federal funds purchased
Line of Credit Facility [Line Items]
Carrying Value	$ 0	$ 0
Weighted Average Rate	0.00%	0.00%
Line of credit \| FHLB short-term borrowings
Line of Credit Facility [Line Items]
Carrying Value	$ 0	$ 0
Weighted Average Rate	0.00%	0.00%
Line of credit \| FRBSF short-term borrowings under the BTFP
Line of Credit Facility [Line Items]
Carrying Value	$ 0	$ 26,000
Weighted Average Rate	0.00%	5.30%

Stockholders' Equity - Narrative (Details) - USD ($) $ / shares in Units, $ in Millions			3 Months Ended	12 Months Ended
	Apr. 25, 2024	Jan. 25, 2024	Mar. 31, 2024	Dec. 31, 2023	Jul. 21, 2023
Class of Stock [Line Items]
Dividends declared per common share (in usd per share)		$ 0.25
Subsequent event
Class of Stock [Line Items]
Dividends declared per common share (in usd per share)	$ 0.25
Common Stock
Class of Stock [Line Items]
Share repurchase program, amount approved to repurchase					$ 25.0
Stock repurchased, including commissions (in shares)			0	0
Performance-based stock awards
Class of Stock [Line Items]
Vesting period of performance-based stock awards			3 years
Performance-based stock awards \| Minimum
Class of Stock [Line Items]
Vesting percentage of performance-based awards			0.00%
Performance-based stock awards \| Maximum
Class of Stock [Line Items]
Vesting percentage of performance-based awards			200.00%

Stockholders' Equity - Schedule of Cashless Exercise Information (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Equity [Abstract]
Number of shares withheld (in shares)	3,338	2,847
Amount of shares withheld for tax withholding and exercise of options	$ 55	$ 82
Weighted-average price (usd per share)	$ 16.62	$ 28.74

Commitments and Contingent Liabilities - Schedule of Undrawn Loan Commitments and Standby Letters of Credit (Details) - USD ($) $ in Thousands	Mar. 31, 2024	Dec. 31, 2023
Total unfunded loan commitments and standby letters of credit
Other Commitments [Line Items]
Total unfunded loan commitments and standby letters of credit	$ 489,444	$ 505,150
Commercial lines of credit
Other Commitments [Line Items]
Total unfunded loan commitments and standby letters of credit	250,602	259,989
Revolving home equity lines
Other Commitments [Line Items]
Total unfunded loan commitments and standby letters of credit	216,387	218,935
Undisbursed construction loans
Other Commitments [Line Items]
Total unfunded loan commitments and standby letters of credit	10,176	13,943
Personal and other lines of credit
Other Commitments [Line Items]
Total unfunded loan commitments and standby letters of credit	9,132	9,136
Standby letters of credit
Other Commitments [Line Items]
Total unfunded loan commitments and standby letters of credit	$ 3,147	$ 3,147

Commitments and Contingent Liabilities - Narrative (Details) - USD ($)	3 Months Ended
	Mar. 31, 2024	Dec. 31, 2023	Mar. 31, 2023
Loss Contingencies [Line Items]
Reversal of credit losses on unfunded loan commitments	$ 0	$ 0	$ 174,000
Unfunded loan commitments			$ 37,400,000
Minimum
Loss Contingencies [Line Items]
Weighted average remaining term (in years)	30 days
Finance lease, initial contract terms (in years)	3 years
Maximum
Loss Contingencies [Line Items]
Weighted average remaining term (in years)	18 years 5 months
Finance lease, initial contract terms (in years)	5 years
Interest payable and other liabilities \| Total unfunded loan commitments and standby letters of credit
Loss Contingencies [Line Items]
Allowance for off balance sheet commitments	$ 1,100,000	$ 1,100,000

Commitments and Contingent Liabilities - Schedule of Operating and Finance Lease Right-of-Use Assets and Lease Liabilities (Details) - USD ($) $ in Thousands	Mar. 31, 2024	Dec. 31, 2023
Operating leases:
Operating lease right-of-use assets	$ 21,553	$ 20,316
Operating lease liabilities	$ 24,150	$ 22,906
Finance leases:
Finance lease, right-of-use asset, statement of financial position [Extensible List]	Bank premises and equipment, net	Bank premises and equipment, net
Finance lease right-of-use assets	$ 608	$ 608
Accumulated amortization	(356)	(319)
Finance lease right-of-use assets, net	252	289
Finance lease liabilities	$ 260	$ 298

Commitments and Contingent Liabilities - Schedule of Noncash Investing and Financing Activities (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Commitments and Contingencies Disclosure [Abstract]
Right-of-use assets obtained in exchange for operating lease liabilities	$ 2,417	$ 0

Commitments and Contingent Liabilities - Schedule of Lease Cost (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Commitments and Contingencies Disclosure [Abstract]
Operating lease cost	$ 1,318	$ 1,610
Finance lease cost:
Amortization of right-of-use assets	37	37
Interest on finance lease liabilities	1	2
Total finance lease cost	38	39
Total lease cost	$ 1,356	$ 1,649

Commitments and Contingent Liabilities - Schedule of Operating and Finance Lease Liability Maturity Schedule (Details) - USD ($) $ in Thousands	Mar. 31, 2024	Dec. 31, 2023
Operating Leases
2024	$ 3,630
2025	4,295
2026	3,561
2027	3,291
2028	2,910
Thereafter	9,856
Total minimum lease payments	27,543
Amounts representing interest (present value discount)	(3,393)
Present value of net minimum lease payments (lease liability)	$ 24,150	$ 22,906
Weighted average remaining term (in years)	8 years
Weighted average discount rate	2.72%
Finance Leases
2024	$ 117
2025	108
2026	37
2027	5
2028	0
Thereafter	0
Total minimum lease payments	267
Amounts representing interest (present value discount)	(7)
Present value of net minimum lease payments (lease liability)	$ 260	$ 298
Weighted average remaining term (in years)	2 years
Weighted average discount rate	2.14%

Derivative Financial Instruments and Hedging Activities - Narrative (Details) - Interest rate swap $ in Millions	Jul. 07, 2023 USD ($)	Mar. 31, 2024 interest_rate_swap
Derivatives, Fair Value [Line Items]
Derivative, notional amount \| $	$ 101.8
Minimum
Derivatives, Fair Value [Line Items]
Derivative, term of contract	2 years 6 months
Maximum
Derivatives, Fair Value [Line Items]
Derivative, term of contract	3 years
Fair value hedge \| Designated as hedging instrument
Derivatives, Fair Value [Line Items]
Number of instruments held \| interest_rate_swap		3

Derivative Financial Instruments and Hedging Activities - Schedule of Information on Derivatives (Details) - USD ($) $ in Thousands	Mar. 31, 2024	Dec. 31, 2023
Derivatives, Fair Value [Line Items]
Accrued interest	$ 2,300	$ 2,300
Available For Sale Securities
Derivatives, Fair Value [Line Items]
Carrying Amounts of Hedged Assets	108,125	107,181
Cumulative Amounts of Fair Value Hedging Adjustments Included in the Carrying Amounts of the Hedged Assets	(142)	(1,359)
Loans Receivable
Derivatives, Fair Value [Line Items]
Carrying Amounts of Hedged Assets	7,841	8,183
Cumulative Amounts of Fair Value Hedging Adjustments Included in the Carrying Amounts of the Hedged Assets	(478)	(367)
Fair value hedge
Derivatives, Fair Value [Line Items]
Accrued interest	233	222
Fair value hedge \| Designated as hedging instrument \| Interest rate swap \| Available For Sale Securities
Derivatives, Fair Value [Line Items]
Interest rate contracts notional amount, asset derivatives	0	0
Interest rate contracts notional amount, liability derivatives	101,770	101,770
Interest rate contracts fair value, asset derivatives	0	0
Interest rate contracts fair value, liability derivatives	142	1,359
Fair value hedge \| Designated as hedging instrument \| Interest rate contract \| Loans Receivable
Derivatives, Fair Value [Line Items]
Interest rate contracts notional amount, asset derivatives	8,366	6,441
Interest rate contracts notional amount, liability derivatives	0	2,157
Interest rate contracts fair value, asset derivatives	400	287
Interest rate contracts fair value, liability derivatives	$ 0	$ 2

Derivative Financial Instruments and Hedging Activities - Schedule of Interest Income (Details) - Fair value hedge - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Interest on Investment Securities
Derivatives, Fair Value [Line Items]
Increase (decrease) in fair value	$ 1,217	$ 0
Hedged interest earned	206	0
(Decrease) increase in carrying value included in the hedged loans	(1,217)	0
Net gain recognized in interest income on loans	206	0
Interest and Fees on Loans
Derivatives, Fair Value [Line Items]
Increase (decrease) in fair value	115	(221)
Hedged interest earned	54	51
(Decrease) increase in carrying value included in the hedged loans	(110)	221
Decrease in value of yield maintenance agreement	(2)	(2)
Net gain recognized in interest income on loans	$ 57	$ 49

Derivative Financial Instruments and Hedging Activities - Schedule of Offsetting of Assets (Details) - USD ($) $ in Thousands	Mar. 31, 2024	Dec. 31, 2023
Derivatives, Fair Value [Line Items]
Gross amounts of recognized assets	$ 400	$ 287
Gross amounts offset in the statements of condition	0	0
Net amounts of assets presented in the statements of condition	400	287
Gross amounts not offset in the statements of condition, financial instruments	0	0
Gross amounts not offset in the statements of condition, cash collateral received	0	0
Net Amount	400	287
Counterparty
Derivatives, Fair Value [Line Items]
Gross amounts of recognized assets	400	287
Gross amounts offset in the statements of condition	0	0
Net amounts of assets presented in the statements of condition	400	287
Gross amounts not offset in the statements of condition, financial instruments	0	0
Gross amounts not offset in the statements of condition, cash collateral received	0	0
Net Amount	$ 400	$ 287

Derivative Financial Instruments and Hedging Activities - Schedule of Offsetting of Liabilities (Details) - USD ($) $ in Thousands	Mar. 31, 2024	Dec. 31, 2023
Derivatives, Fair Value [Line Items]
Gross amounts of recognized liabilities	$ 142	$ 1,361
Gross amounts offset in the statements of condition	0	0
Net amounts of liabilities presented in the statements of condition	142	1,361
Gross amounts not offset in the statements of condition, financial instruments	(142)	(287)
Gross amounts not offset in the statements of condition, cash collateral pledged	0	(330)
Net Amount	0	744
Counterparty
Derivatives, Fair Value [Line Items]
Gross amounts of recognized liabilities	142	1,361
Gross amounts offset in the statements of condition	0	0
Net amounts of liabilities presented in the statements of condition	142	1,361
Gross amounts not offset in the statements of condition, financial instruments	(142)	(287)
Gross amounts not offset in the statements of condition, cash collateral pledged	0	(330)
Net Amount	$ 0	$ 744