First Seacoast Bancorp 10-Q 10 May 24 2024 Q1 Quarterly report Financial data

Cover Page

Cover Page - shares	3 Months Ended
	Mar. 31, 2024	May 03, 2024
Cover [Abstract]
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Mar. 31, 2024
Document Fiscal Year Focus	2024
Document Fiscal Period Focus	Q1
Trading Symbol	FSEA
Title of 12(b) Security	Common stock, $0.01 par value per share
Security Exchange Name	NASDAQ
Entity Registrant Name	First Seacoast Bancorp, Inc.
Entity Central Index Key	0001943802
Current Fiscal Year End Date	--12-31
Entity Filer Category	Non-accelerated Filer
Entity Small Business	true
Entity Emerging Growth Company	true
Entity Ex Transition Period	false
Entity Common Stock, Shares Outstanding		5,077,164
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Shell Company	false
Document Quarterly Report	true
Document Transition Report	false
Entity Incorporation, State or Country Code	MD
Entity File Number	001-41597
Entity Address, Address Line One	633 Central Avenue
Entity Address, City or Town	Dover
Entity Address, State or Province	NH
City Area Code	603
Local Phone Number	742-4680
Entity Address, Postal Zip Code	03820
Entity Tax Identification Number	92-0334805

CONSOLIDATED BALANCE SHEETS

CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Mar. 31, 2024	Dec. 31, 2023
ASSETS
Cash and due from banks	$ 6,713	$ 6,069
Securities available-for-sale, at fair value	124,199	121,854
Federal Home Loan Bank stock	3,448	2,986
Total loans	431,851	430,031
Less allowance for credit losses on loans	(3,420)	(3,390)
Net loans	428,431	426,641
Land, building and equipment, net	3,979	4,072
Bank-owned life insurance	4,683	4,663
Accrued interest receivable	2,368	2,294
Other assets	2,650	2,456
Total assets	576,471	571,035
Deposits:
Non-interest bearing deposits	64,628	65,845
Interest bearing deposits	340,967	338,953
Total deposits	405,595	404,798
Advances from Federal Home Loan Bank	78,412	73,007
Advances from Federal Reserve Bank	20,000	20,000
Mortgagors’ tax escrow	2,079	640
Deferred compensation liability	2,117	2,071
Other liabilities	3,529	3,901
Total liabilities	511,732	504,417
Stockholders' Equity:
Preferred Stock, $.01 par value, 10,000,000 shares authorized, none issued
Common Stock, $.01 par value, 90,000,000 shares authorized; 5,192,612 issued and 5,077,164 outstanding at March 31, 2024 and December 31, 2023	52	52
Additional paid-in capital	52,698	52,642
Retained earnings	24,445	25,597
Accumulated other comprehensive loss	(6,867)	(5,944)
Treasury stock, at cost: 115,448 shares outstanding as of March 31, 2024 and December 31, 2023	(1,381)	(1,381)
Unearned stock compensation	(4,208)	(4,348)
Total stockholders' equity	64,739	66,618
Total liabilities and stockholders' equity	$ 576,471	$ 571,035

CONSOLIDATED BALANCE SHEETS (Pa

CONSOLIDATED BALANCE SHEETS (Parenthetical) - $ / shares	Mar. 31, 2024	Dec. 31, 2023
Statement Of Financial Position [Abstract]
Preferred Stock, Par or Stated Value Per Share	$ 0.01	$ 0.01
Preferred Stock, Shares Authorized	10,000,000	10,000,000
Preferred Stock, Shares Issued	0	0
Preferred Stock, Shares Outstanding	0	0
Common stock par value per share	$ 0.01	$ 0.01
Common stock,number of shares authorized	90,000,000	90,000,000
Common stock,number of shares issued	5,192,612	5,192,612
Common stock, number of shares outstanding	5,077,164	5,077,164
Treasury Stock, Shares outstanding	115,448	115,448

CONSOLIDATED STATEMENTS OF (LOS

CONSOLIDATED STATEMENTS OF (LOSS) INCOME (UNAUDITED) - USD ($)		3 Months Ended
		Mar. 31, 2024	Mar. 31, 2023
Interest and dividend income:
Interest and fees on loans		$ 4,710,000	$ 3,808,000
Interest on debt securities:
Taxable		852,000	342,000
Non-taxable		440,000	422,000
Total interest on debt securities		1,292,000	764,000
Dividends		68,000	64,000
Total interest and dividend income		6,070,000	4,636,000
Interest expense:
Interest on deposits		2,030,000	586,000
Interest on borrowings		1,149,000	854,000
Total interest expense		3,179,000	1,440,000
Net interest and dividend income		2,891,000	3,196,000
(Release) provision for credit losses		(20,000)	30,000
Net interest and dividend income after (release) provision for credit losses		2,911,000	3,166,000
Non-interest income:
Customer service fees		168,000	196,000
Gain on termination of interest rate swaps			849,000
Income from bank-owned life insurance		20,000	20,000
Loan servicing fee income		11,000	15,000
Investment services fees		89,000	71,000
Other income		9,000	10,000
Total non-interest income		297,000	1,161,000
Non-interest expense:
Salaries and employee benefits		2,314,000	2,364,000
Director compensation		105,000	100,000
Occupancy expense		179,000	186,000
Equipment expense		105,000	109,000
Marketing		81,000	89,000
Data processing		335,000	391,000
Deposit insurance fees		98,000	59,000
Professional fees and assessments		389,000	212,000
Debit card fees		30,000	49,000
Employee travel and education expenses		32,000	43,000
Other expense		330,000	221,000
Total non-interest expense		3,998,000	3,823,000
(Loss) income before income tax expense		(790,000)	504,000
Income tax expense		362,000	40,000
Net (loss) income		$ (1,152,000)	$ 464,000
(Loss) earnings per share:
Basic		$ (0.24)	$ 0.10
Diluted		$ (0.24)	$ 0.10
Weighted Average Shares:
Basic		4,713,931	4,673,732
Diluted	[1]	4,713,931	4,673,732
[1] Not adjusted for potentially dilutive shares for periods where a net loss was recognized. The three months ended March 31, 2024 excludes 66,027 stock-based awards that could potentially dilute basic earnings per share in the future that were not included in the computation of diluted earnings per share because to do so would have been antidilutive for the periods presented.

CONSOLIDATED STATEMENTS OF (L_2

CONSOLIDATED STATEMENTS OF (LOSS) INCOME (UNAUDITED) (Parenthetical)	3 Months Ended
	Mar. 31, 2024 shares
Stock-based Awards [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive shares that are not included in computation of diluted earnings per share	66,027

CONSOLIDATED STATEMENTS OF COMP

CONSOLIDATED STATEMENTS OF COMPREHENSIVE (LOSS) INCOME (UNAUDITED) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Statement Of Income And Comprehensive Income [Abstract]
Net (loss) income	$ (1,152)	$ 464
Other comprehensive (loss) income, net of income taxes:
Unrealized holding (losses) gains on securities available-for-sale arising during the period, net of income taxes of $(381) and $523, respectively	(1,033)	1,334
Reclassification adjustment for net amortization of bond premiums included in net (loss) income, net of income taxes of $40 and $64, respectively	110	175
Total unrealized (loss) income on securities available-for-sale	(923)	1,509
Change in interest rate swaps, net of income taxes of $-0- and $(30), respectively	0	(82)
Reclassification adjustment for swap unwind gains and net interest expense on swaps included in net (loss) income, net of income taxes of $-0- and $(230), respectively	0	(619)
Total change in interest rate swaps	0	(701)
Other comprehensive (loss) income	(923)	808
Comprehensive (loss) income	$ (2,075)	$ 1,272

CONSOLIDATED STATEMENTS OF CO_2

CONSOLIDATED STATEMENTS OF COMPREHENSIVE (LOSS) INCOME (UNAUDITED) (Parenthetical) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Statement Of Income And Comprehensive Income [Abstract]
Unrealized holding (losses) gains on securities available-for-sale arising during the period, income taxes	$ (381)	$ 523
Reclassification adjustment for net amortization of bond premiums included in net (loss) income, income tax	40	64
Change in interest rate swaps, income tax	0	(30)
Reclassification adjustment for net interest expense on swaps included in net income, income tax	$ 0	$ (230)

CONSOLIDATED STATEMENTS OF CHAN

CONSOLIDATED STATEMENTS OF CHANGES IN STOCKHOLDERS' EQUITY (UNAUDITED) - USD ($) $ in Thousands		Total		Cumulative Adjustment for Change in Accounting Principle [Member]	Common Stock [Member]		Additional Paid-in Capital [Member]		Retained Earnings [Member]		Retained Earnings [Member] Cumulative Adjustment for Change in Accounting Principle [Member]	Accumulated Other Comprehensive Loss [Member]		Treasury Stock		Unearned Compensation ESOP [Member]
Beginning Balance at Dec. 31, 2022		$ 49,337	[1]	$ 5	$ 62	[1]	$ 26,768	[1]	$ 36,248	[1]	$ 5	$ (9,727)	[1]	$ (1,377)	[1]	$ (2,637)	[1]
Beginning Balance (shares) at Dec. 31, 2022	[1]				5,068,637
Accounting Standards Update [Extensible Enumeration]				Accounting Standards Update 2016-13 [Member]							Accounting Standards Update 2016-13 [Member]
Net (loss) income		464							464
Other comprehensive (loss) income		808										808
Reorganization: Conversion of First Seacoast Bancorp, Inc.		25,722			$ (10)		25,732
Reorganization: Conversion of First Seacoast Bancorp, Inc. , Shares					6,598
Purchase of common stock by the ESOP		(2,244)														(2,244)
Amortization of unearned stock compensation		97														97
ESOP shares earned		38														38
Ending Balance at Mar. 31, 2023		74,227			$ 52		52,500		36,717			(8,919)		(1,377)		(4,746)
Ending Balance (shares) at Mar. 31, 2023					5,075,235
Beginning Balance at Dec. 31, 2023		66,618			$ 52		52,642		25,597			(5,944)		(1,381)		(4,348)
Beginning Balance (shares) at Dec. 31, 2023					5,077,164
Net (loss) income		(1,152)							(1,152)
Other comprehensive (loss) income		(923)										(923)
Amortization of unearned stock compensation		164					62									102
ESOP shares earned		32					(6)									38
Ending Balance at Mar. 31, 2024		$ 64,739			$ 52		$ 52,698		$ 24,445			$ (6,867)		$ (1,381)		$ (4,208)
Ending Balance (shares) at Mar. 31, 2024					5,077,164
[1] Shares adjusted for conversion of the former First Seacoast Bancorp, MHC.

CONSOLIDATED STATEMENTS OF CH_2

CONSOLIDATED STATEMENTS OF CHANGES IN STOCKHOLDERS' EQUITY (UNAUDITED) (Parenthetical) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Statement Of Stockholders Equity [Abstract]
Number of shares committed to be released each year,ESOP	3,839	3,839
Conversion, net of cost		$ 2.4
Purchase of shares of common stock		224,400

CONSOLIDATED STATEMENTS OF CASH

CONSOLIDATED STATEMENTS OF CASH FLOWS (UNAUDITED) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Cash flows from operating activities:
Net (loss) income	$ (1,152)	$ 464
Adjustments to reconcile net (loss) income to net cash used by operating activities:
Cumulative change in accounting principle (ASU 2016-13)		5
ESOP expense	32	38
Stock based compensation	164	97
Depreciation and amortization	112	118
Net amortization of bond premium	150	239
(Release) provision for credit losses	(20)	30
Gain on termination of interest rate swaps		(849)
Increase in bank-owned life insurance	(20)	(20)
Decrease (increase) in deferred costs on loans	36	(35)
Deferred tax expense	342	18
(Increase) decrease in accrued interest receivable	(74)	86
Decrease in other assets	636	618
Increase (decrease) in deferred compensation liability	46	(4)
Decrease in other liabilities	(322)	(1,166)
Net cash used by operating activities	(70)	(361)
Cash flows from investing activities:
Proceeds from sales, maturities and principal payments from securities available-for-sale	1,258	1,038
Purchase of securities available-for-sale	(5,166)	(1,146)
Purchase of property and equipment	(11)	(75)
Loan purchases	(774)	(304)
Loan originations and principal collections, net	(1,772)	(4,067)
Net (purchase) redemption of Federal Home Loan Bank stock	(462)	1,108
Proceeds from sales of interest bearing time deposits with other banks		498
Proceeds from unwind of interest rate swaps		849
Net cash used by investing activities	(6,927)	(2,099)
Cash flows from financing activities:
Net (decrease) increase in NOW, demand deposits, money market and savings accounts	(1,757)	28,198
Net increase in time deposits	2,554	4,745
Increase in mortgagors' escrow accounts	1,439	1,142
Proceeds from sale of common stock, net		25,622
Common stock purchased by ESOP		(2,244)
Net cash provided by financing activities	7,641	10,833
Net change in cash and cash equivalents	644	8,373
Cash and cash equivalents at beginning of period	6,069	8,250
Cash and cash equivalents at end of period	6,713	16,623
Cash activities:
Cash paid for interest	2,916	1,459
Cash paid for income taxes		1
Effect of change in fair value of securities available-for-sale:
Securities available-for-sale	(1,264)	2,096
Deferred taxes	341	(587)
Other comprehensive (loss) income	(923)	1,509
Cumulative fair value hedging adjustment - loans	(690)
Cumulative fair value hedging adjustment - securities available-for-sale	(149)
Effect of change in fair value of interest rate swaps:
Interest rate swaps		(961)
Deferred taxes		260
Other comprehensive loss		(701)
First Seacoast Bancorp, Inc [Member]
Cash flows from financing activities:
Return of capital from conversion of First Seacoast Bancorp, Inc.		100
ASU 2016-13 | Cumulative Adjustment for Change in Accounting Principle [Member]
Effect of the adoption of ASU
Allowance for credit losses on loans		(295)
Other liabilities		290
Federal Home Loan Bank Advances [Member]
Cash flows from financing activities:
Net proceeds (payments) from short-term FHLB advances	$ 5,405	(41,730)
Payments on long-term FHLB advances		$ (5,000)

Pay vs Performance Disclosure

Pay vs Performance Disclosure - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Pay vs Performance Disclosure
Net Income (Loss)	$ (1,152)	$ 464

Insider Trading Arrangements

Insider Trading Arrangements	3 Months Ended
	Mar. 31, 2024
Trading Arrangements, by Individual
Rule 10b5-1 Arrangement Adopted	false
Non-Rule 10b5-1 Arrangement Adopted	false
Rule 10b5-1 Arrangement Terminated	false
Non-Rule 10b5-1 Arrangement Terminated	false

Summary of Significant Accounti

Summary of Significant Accounting Policies	3 Months Ended
	Mar. 31, 2024
Accounting Policies [Abstract]
Summary of Significant Accounting Policies	1. Summary of Significant Accounting Policies The accompanying unaudited consolidated financial statements include the accounts of First Seacoast Bancorp, Inc. (the “Company”), its wholly-owned subsidiary, First Seacoast Bank (the “Bank”), and the Bank’s wholly-owned subsidiary, FSB Service Corporation, Inc. All significant intercompany balances and transactions have been eliminated in consolidation. Basis of Presentation The accompanying unaudited consolidated financial statements of the Company were prepared in accordance with generally accepted accounting principles in the United States of America (“U.S. GAAP”) for interim consolidated financial information, general practices within the banking industry and with instructions for Form 10-Q and Regulation S-X. Accordingly, these interim financial statements do not include all the information or footnotes required by U.S. GAAP for annual financial statements. However, in the opinion of management, all adjustments (consisting solely of normal recurring adjustments) necessary for a fair presentation of these consolidated financial statements have been included. The results of operations for the interim periods disclosed herein are not necessarily indicative of the results which may be expected for the entire year. These statements should be read in conjunction with the audited consolidated financial statements and notes thereto contained in the Annual Report on Form 10-K for the fiscal year ended December 31, 2023 , as filed with the U.S. Securities and Exchange Commission (“SEC”) on March 29, 2024. Corporate Structure On January 19, 2023, the conversion of First Seacoast Bancorp, MHC from mutual to stock form and the related stock offering by First Seacoast Bancorp, Inc., the new holding company for First Seacoast Bank, was completed. As a result, both First Seacoast Bancorp, MHC and First Seacoast Bancorp ceased to exist. First Seacoast Bancorp, Inc.’s common stock began trading on the Nasdaq Capital Market under the trading symbol “FSEA” on January 20, 2023. As a result of the subscription offering, the community offering and the syndicated community offering, First Seacoast Bancorp, Inc. sold a total of 2,805,000 shares of its common stock at a price of $ 10.00 per share, which includes 224,400 shares sold to First Seacoast Bank’s Employee Stock Ownership Plan. As part of the conversion transaction, each outstanding share of First Seacoast Bancorp (a federal corporation) common stock owned by the public stockholders of First Seacoast Bancorp (a federal corporation) (stockholders other than First Seacoast Bancorp, MHC) as of the closing date was converted into shares of First Seacoast Bancorp, Inc. common stock based on an exchange ratio of 0.8358 shares of First Seacoast Bancorp, Inc. common stock for each share of First Seacoast Bancorp (a federal corporation) common stock. The Bank offers a full range of banking and wealth management services to its customers. The Bank focuses on four core services that center around customer needs. The core services include residential lending, commercial banking, personal banking and wealth management. The Bank offers a full range of commercial and consumer banking services through its network of five full-service branch locations. The Bank is engaged principally in the business of attracting deposits from the public and investing those funds in various types of loans, including residential and commercial real estate loans, and a variety of commercial and consumer loans. The Bank also invests its deposits and borrowed funds in investment securities. Deposits at the Bank are insured by the Federal Deposit Insurance Corporation (“FDIC”) for the maximum amount permitted by law. The Company has one reportable segment, “Banking Services.” All of the Company’s activities are interrelated, and each activity is dependent and assessed based on how each of the activities of the Company supports the others. For example, lending is dependent upon the ability of the Company to fund itself with deposits and other borrowings and manage interest rate and credit risk. Accordingly, all significant operating decisions are based upon analysis of the Company as one segment or unit. Investment management services are offered through FSB Wealth Management. FSB Wealth Management is a division of First Seacoast Bank. The division currently consists of two financial advisors who are located in Dover, New Hampshire. FSB Wealth Management provides access to non-FDIC insured products that include retirement planning, portfolio management, investment and insurance strategies, business retirement plans and college planning to individuals throughout our primary market area. These investments and services are offered through a third-party registered broker-dealer and investment advisor. FSB Wealth Management receives fees from advisory services and commissions on individual investment and insurance products purchased by clients. The assets held for wealth management customers are not assets of the Company and, accordingly, are not reflected in the Company’s consolidated balance sheets. On August 17, 2021, the Bank entered into a definitive agreement with an investment advisory and wealth management firm (the “seller”) to purchase certain of its client accounts and client relationships for a final adjusted purchase price of $ 324,000 . The client accounts purchased are recorded as a customer list intangible asset. Identifiable intangible assets that are subject to amortization will be reviewed for impairment, at least annually, based on their fair value. Any impairment will be recognized as a charge to earnings and the adjusted carrying amount of the intangible asset will become its new accounting basis. The remaining useful life of the intangible asset will also be evaluated each reporting period to determine whether events and circumstances warrant a revision to the remaining period of amortization. The Company is amortizing the customer list intangible on a straight-line basis over a ten-year period. During the three months ended March 31, 2024 and 2023, $ 8,000 and $ 9,000 of amortization expense was recorded in other expense, respectively. Customer list intangible balances included in other assets are $ 239,000 and $ 247,000 as of March 31, 2024 and December 31, 2023, respectively. Recent Accounting Pronouncements Yet To Be Adopted As an “emerging growth company,” as defined in Title 1 of Jumpstart Our Business Startups (JOBS) Act, the Company has elected to use the extended transition period to delay adoption of new or reissued accounting pronouncements applicable to public companies until such pronouncements are made applicable to private companies. As a result, the Company’s consolidated financial statements may not be comparable to the financial statements of public companies that comply with such new or revised accounting standards without an extended transition period. As of March 31, 2024 , there was no significant difference in the comparability of the Company’s consolidated financial statements as a result of this extended transition period. The Company’s status as an “emerging growth company” will end on the earlier of: (i) the last day of the fiscal year of the Company during which it had total annual gross revenues of $1.235 billion (as adjusted for inflation) or more; (ii) the last day of the fiscal year of the Company following the fifth anniversary of the effective date of the Company’s initial public offering; (which will be December 31, 2024 for the Company) (iii) the date on which the Company has, during the previous three-year period, issued more than $1.0 billion in non-convertible debt; or (iv) the date on which the Company is deemed to be a “large accelerated filer” under Securities and Exchange Commission regulations (generally, at least $700 million of voting and non-voting equity held by non-affiliates). The Company considers the applicability and impact of all ASUs. ASUs not listed below were assessed and determined to be either not applicable or are expected to have an immaterial impact on the Company’s consolidated financial statements. In March 2024, the FASB issued ASU 2024-02, “Codification Improvements,” amends the Codification to remove references to various concepts statements and impacts a variety of topics in the Codification. The amendments apply to all reporting entities within the scope of the affected accounting guidance, but in most instances the references removed are extraneous and not required to understand or apply the guidance. Generally, the amendments in ASU 2024-02 are not intended to result in significant accounting changes for most entities. ASU 2024-02 is effective January 1, 2025 and is not expected to have a material impact on the Company's consolidated financial statements.

Securities Available-for-Sale

Securities Available-for-Sale	3 Months Ended
	Mar. 31, 2024
Available For Sale Securities [Abstract]
Securities Available For Sale	2. Securities Available-for-Sale The amortized cost and fair value of securities available-for-sale, and the corresponding amounts of gross unrealized gains and losses for which an allowance for credit losses has not been recorded, are as follows as of March 31, 2024 and December 31, 2023: March 31, 2024 Amortized Gross Gross Fair (Dollars in thousands) U.S. Government-sponsored enterprises obligations $ 1,662 $ — $ ( 282 ) $ 1,380 U.S. Government agency small business administration 15,659 18 ( 895 ) 14,782 Collateralized mortgage obligations issued by the 6,012 — ( 538 ) 5,474 Residential mortgage-backed securities 42,743 534 ( 3,954 ) 39,323 Municipal bonds 56,926 787 ( 4,219 ) 53,494 Corporate debt 500 — ( 7 ) 493 Corporate subordinated debt 10,095 82 ( 924 ) 9,253 $ 133,597 $ 1,421 $ ( 10,819 ) $ 124,199 December 31, 2023 Amortized Gross Gross Fair (Dollars in thousands) U.S. Government-sponsored enterprises obligations $ 1,668 $ — $ ( 270 ) $ 1,398 U.S. Government agency small business administration 16,410 36 ( 863 ) 15,583 Collateralized mortgage obligations issued by the 2,958 — ( 484 ) 2,474 Residential mortgage-backed securities 41,186 653 ( 3,618 ) 38,221 Municipal bonds 57,192 1,087 ( 3,587 ) 54,692 Corporate debt 500 — ( 8 ) 492 Corporate subordinated debt 10,074 3 ( 1,083 ) 8,994 $ 129,988 $ 1,779 $ ( 9,913 ) $ 121,854 The amortized cost and fair values of securities available-for-sale at March 31, 2024 by contractual maturity are shown below. Actual maturities may differ from contractual maturities because borrowers may have the right to call or prepay obligations with or without call or prepayment penalties. March 31, 2024 Amortized Fair Value (Dollars in thousands) Due in one year or less $ 1,784 $ 1,789 Due after one year through five years 500 493 Due after five years through ten years 10,917 9,734 Due after ten years 55,982 52,604 Total U.S. Government-sponsored enterprises obligations, 69,183 64,620 U.S. Government agency small business pools guaranteed (1) 15,659 14,782 Collateralized mortgage obligations issued by the FHLMC, (1) 6,012 5,474 Residential mortgage-backed securities (1) 42,743 39,323 Total $ 133,597 $ 124,199 (1) Actual maturities for these debt securities are dependent upon the interest rate environment and prepayments on the underlying loans. The following is a summary of gross unrealized losses and fair value for those investments with unrealized losses for which an allowance for credit losses has not been recorded, aggregated by investment category and length of time the individual securities have been in a continuous unrealized loss position, at March 31, 2024 and December 31, 2023. Less than 12 Months More than 12 Months Total Number of Fair Unrealized Number of Fair Unrealized Fair Unrealized (Dollars in thousands) March 31, 2024 U.S. Government sponsored — $ — $ — 3 $ 1,380 $ ( 282 ) $ 1,380 $ ( 282 ) U.S. Government agency small 8 7,831 ( 65 ) 5 3,787 ( 830 ) 11,618 ( 895 ) Collateralized mortgage 2 3,069 ( 26 ) 4 2,405 ( 512 ) 5,474 ( 538 ) Residential mortgage- 6 5,592 ( 89 ) 23 14,788 ( 3,865 ) 20,380 ( 3,954 ) Municipal bonds 5 3,217 ( 69 ) 49 30,035 ( 4,150 ) 33,252 ( 4,219 ) Corporate debt — — — 1 493 ( 7 ) 493 ( 7 ) Corporate subordinated debt — — — 5 4,601 ( 924 ) 4,601 ( 924 ) 21 $ 19,709 $ ( 249 ) 90 $ 57,489 $ ( 10,570 ) $ 77,198 $ ( 10,819 ) December 31, 2023 U.S. Government sponsored — $ — $ — 3 $ 1,398 $ ( 270 ) $ 1,398 $ ( 270 ) U.S. Government agency small 8 8,432 ( 75 ) 5 3,899 ( 788 ) 12,331 ( 863 ) Collateralized mortgage — — — 4 2,474 ( 484 ) 2,474 ( 484 ) Residential mortgage- 5 4,806 ( 53 ) 23 15,347 ( 3,565 ) 20,153 ( 3,618 ) Municipal bonds 1 1,941 ( 10 ) 49 30,729 ( 3,577 ) 32,670 ( 3,587 ) Corporate debt — — — 1 492 ( 8 ) 492 ( 8 ) Corporate subordinated debt 4 4,080 ( 82 ) 4 4,029 ( 1,001 ) 8,109 ( 1,083 ) 18 $ 19,259 $ ( 220 ) 89 $ 58,368 $ ( 9,693 ) $ 77,627 $ ( 9,913 ) Management evaluates securities available-for-sale in unrealized loss positions to determine whether the impairment is due to credit-related factors or noncredit-related factors. Consideration is given to (1) the extent to which the fair value is less than cost, (2) the financial condition and near-term prospects of the issuer, and (3) the intent and ability of the Company to retain its investment in the security for a period of time sufficient to allow for any anticipated recovery in fair value. At March 31, 2024, the Company had 111 securities available-for-sale in an unrealized loss position without an allowance for credit losses. Management does not have the intent to sell any of these securities and believes that it is more likely than not that the Company will not have to sell any such securities before a recovery of cost. The fair value is expected to recover as the securities approach their maturity date or repricing date or if market yields for such investments decline. Accordingly, as of March 31, 2024, management believes that the unrealized losses detailed in the previous table are due to noncredit-related factors, including changes in interest rates and other market conditions, and therefore the Company carried no allowance for credit losses on securities available-for-sale as of March 31, 2024. Proceeds from sales, maturities, principal payments received and gross realized gains and losses on securities available-for-sale were as follows for the three months ended March 31, 2024 and 2023: March 31, 2024 2023 (Dollars in thousands) Proceeds from sales, maturities and principal payments $ 1,258 $ 1,038 Gross realized gains — — Gross realized losses — — Net realized gains $ — $ — At March 31, 2024 and December 31, 2023, $ 72.7 million and $ 74.1 million of securities available-for-sale were pledged as collateral for the Company's Bank Term Funding Program and Borrower-In-Custody secured credit facilities, respectively (see Note 6 Borrowings for more information).As of March 31, 2024 and December 31, 2023 , there were no holdings of securities of any issuer, other than the SBA, FHLMC, GNMA and FNMA, whose aggregate carrying value exceeded 10% of consolidated stockholders’ equity.

Loans and Allowance for Credit

Loans and Allowance for Credit Losses on Loans	3 Months Ended
	Mar. 31, 2024
Receivables [Abstract]
Loans and Allowance for Credit Losses on Loans	3. Loans and Allowance for Credit Losses on Loans The Company's lending activities are primarily conducted in and around Dover, New Hampshire, and in the areas surrounding its branches. The Company grants commercial real estate loans, multifamily 5+ dwelling unit loans, commercial and industrial loans, acquisition, development and land loans, 1–4 family residential loans, home equity line of credit loans and consumer loans. Most loans are collateralized by real estate. The ability and willingness of real estate, commercial and construction loan borrowers to honor their repayment commitments is generally dependent on the health of the real estate sector in the borrowers’ geographic area and the general economy. Loans consisted of the following at March 31, 2024 and December 31, 2023: March 31, December 31, (Dollars in thousands) Commercial real estate (CRE) $ 87,779 $ 86,566 Multifamily (MF) 7,493 7,582 Commercial and industrial (C+I) 25,394 25,511 Acquisition, development, and land (ADL) 15,205 17,520 1-4 family residential (RES) 270,765 268,943 Home equity line of credit (HELOC) 15,230 14,093 Consumer (CON) 9,985 9,816 Total loans 431,851 430,031 Allowance for credit losses on loans ( 3,420 ) ( 3,390 ) Total loans, net $ 428,431 $ 426,641 Allowance for Credit Losses on Loans ("ACL") Effective January 1, 2023 , the Company adopted the accounting standard for credit losses, ASU No. 2016-13, Financial Instruments - Credit Losses (Topic 326): Measurement of Credit Losses on Financial Instruments, as amended ("ASU 2016-13"). This new accounting standard, commonly referred to as "CECL," significantly changed the methodology for accounting for reserves on loans and unfunded off-balance sheet credit exposures, including certain unfunded loan commitments and standby guarantees. ASU 2016-13 replaced the "incurred loss" methodology used to establish an allowance on loans and off-balance sheet credit exposures, with an "expected loss" approach. Under CECL, the ACL at each reporting period serves as a best estimate of projected credit losses over the contractual life of certain assets, adjusted for expected prepayments, given an expectation of economic conditions and forecasts as of the valuation date. Upon adoption of CECL, the Company made the following elections regarding accrued interest receivable: (i) present accrued interest receivable balances separately on the balance sheet on the consolidated statements of condition; (ii) exclude accrued interest from the measurement of the ACL, including investments and loans; and (iii) continue to write-off accrued interest receivable by reversing interest income. The Company has a policy in place to write-off accrued interest when a loan is placed on non-accrual. Accrued interest is written-off by reversing previously recorded interest income. For loans, write-off typically occurs when a loan has been in default for 90 days or more. An immaterial amount of accrued interest on non-accrual loans was written off during the three months ended March 31, 2024 and 2023, by reversing interest income. Historically, the Company has not experienced uncollectible accrued interest receivable on its securities available-for-sale. The ACL is the sum of various components including the following: (a) historical loss experience, (b) a reasonable and supportable forecast, (c) loans evaluated individually, and (d) changes in relevant environmental factors. The historical loss component is segmented by loan type and serves as the core of the ACL adequacy methodology. The Company has selected the Weighted Average Remaining Maturity Model (“WARM”), for the loss calculation of each of the Bank’s loan pools utilizing a third-party software application. The WARM uses a quarterly loss rate and future expectations of loan balances to calculate an ACL. A loss rate is applied to pool balances over time. CECL may create more volatility in the ACL, specifically the ACL on loans and ACL on off-balance sheet credit exposures. Under CECL, the ACL may increase or decrease period to period based on many factors, including, but not limited to: (i) macroeconomic forecasts and conditions; (ii) forecast period and reversion speed; (iii) prepayment speed assumption; (iv) loan portfolio volumes and changes in mix; (v) credit quality; and (vi) various qualitative factors outlined in ASU 2016-13. The significant key assumptions used with the ACL calculation at March 31, 2024 and December 31, 2023 using the CECL methodology, included: • Macroeconomic factors (loss drivers) : Monitoring and assessing local and national unemployment, changes in national GDP and other macroeconomic factors which may be the most predictive indicator of losses within the loan portfolio. The macroeconomic factors considered in determining the ACL may change from time to time. • Forecast Period and Reversion speed : ASU 2016-13 requires a company to use a reasonable and supportable forecast period in developing the ACL, which represents the time period that management believes it can reasonably forecast the identified loss drivers. Generally, the forecast period management believes to be reasonable and supportable will be set annually and validated through an assessment of economic leading indicators. In periods of greater volatility and uncertainty, such as the current interest rate environment, management will likely use a shorter forecast period, whereas when markets, economies, interest rate environment, political matters, and other factors are considered to be more stable and certain, a longer forecast period may be used. Also, in times of greater uncertainty, management may consider a range of possible forecasts and evaluate the probability of each scenario. Generally, the forecasted period is expected to range from one to three years. Once the reasonable and supportable forecast period is determined, ASU 2016-13 requires a company to revert its loss expectations to the long-run historical mean for the remainder of the contract life of the asset, adjusted for prepayments. In determining the length of time over which the reversion will take place (i.e. "reversion speed"), factors such as, historical credit loss experience over previous economic cycles, as well as where the Company believes it is within the current economic cycle, will be considered. The Company has chosen a forecast period of six quarters which will be similar to the historical loss period between January 2014 and December 2016 and then reverting to the long-term average over the following two quarters using the straight-line reversion method. The Company believes this historical forecast period to be representative of potential economic conditions over the next eighteen months. • Prepayment speeds: Prepayment speeds are determined for each loan segment utilizing the Company's historical loan data, as well as consideration of current environmental factors. The prepayment speed assumption is utilized with the WARM method to forecast expected cash flows over the contractual life of the loan, adjusted for expected prepayments. A higher prepayment speed assumption will drive a lower ACL, and vice versa. • Qualitative factors: As within previous accounting guidance used for the "incurred loss" model, ASU 2016-13 requires companies to consider various qualitative factors that may impact expected credit losses. The Company continues to consider qualitative factors in determining and arriving at an ACL at each reporting period such as: (i) actual or expected changes in economic trends and conditions, (ii) changes in the value of underlying collateral for loans, (iii) changes to lending policies, underwriting standards and/or management personnel performing such functions, (iv) delinquency and other credit quality trends, (v) credit risk concentrations, if any, (vi) changes to the nature of the Company's business impacting the loan portfolio, (vii) and other external factors, that may include, but are not limited to, results of internal loan reviews and examinations by bank regulatory agencies. Certain loans which may not share similar risk characteristics with other loans in the portfolio may be tested individually for estimated credit losses, including (i) loans classified as special mention, substandard or doubtful and are on non-accrual, (ii) a loan modified for a borrower experiencing financial difficulty or (iii) loans that have other unique characteristics. Factors considered in measuring the extent of the expected credit loss for these loans may include payment status, collateral value, borrower's financial condition, guarantor support and the probability of collecting scheduled principal and interest payments when due. January 1, 2023 CECL Transition (Day 1) Impact The CECL methodology reflects the Company's view of the state of the economy and forecasted macroeconomic conditions and their impact on the Company's loan portfolio as of the adoption date. The following table illustrates the impact of the adoption of ASU 2016-13: January 1, 2023 As reported under ASC 326 Pre-ASC 326 Adoption Impact of ASC 326 Adoption (Dollars in thousands) ASSETS Allowance for credit losses on loans: Commercial real estate (CRE) $ 788 $ 942 $ ( 154 ) Multifamily (MF) 55 54 1 Commercial and industrial (C+I) 273 184 89 Acquisition, development, and land (ADL) 120 138 ( 18 ) 1-4 family residential (RES) 1,847 2,048 ( 201 ) Home equity line of credit (HELOC) 88 81 7 Consumer (CON) 114 100 14 Unallocated 1 34 ( 33 ) Allowance for credit losses on loans $ 3,286 $ 3,581 ( 295 ) LIABILITIES Allowance for credit losses on OBS credit exposures $ 308 $ 18 $ 290 Changes in the ACL for the three months ended March 31, 2024 and 2023, by portfolio segment, are summarized as follows: (Dollars in thousands) CRE MF C+I ADL RES HELOC CON Unallocated Total Balance, December 31, 2023 $ 830 $ 76 $ 236 $ 105 $ 1,601 $ 156 $ 357 $ 29 $ 3,390 (Release) provision for credit losses on loans ( 85 ) ( 1 ) 15 ( 25 ) ( 1 ) 13 15 99 30 Charge-offs — — — — — — — — — Recoveries — — — — — — — — — Balance, March 31, 2024 $ 745 $ 75 $ 251 $ 80 $ 1,600 $ 169 $ 372 $ 128 $ 3,420 (Dollars in thousands) CRE MF C+I ADL RES HELOC CON Unallocated Total Balance, December 31, 2022, Prior to Adoption of ASC 326 $ 942 $ 54 $ 184 $ 138 $ 2,048 $ 81 $ 100 $ 34 $ 3,581 Impact of adopting ASC 326 ( 154 ) 1 89 ( 18 ) ( 201 ) 7 14 ( 33 ) ( 295 ) (Release) provision for credit losses on loans ( 63 ) ( 6 ) 8 ( 24 ) 57 — 4 24 — Recoveries — — — — — — 1 — 1 Balance, March 31, 2023 $ 725 $ 49 $ 281 $ 96 $ 1,904 $ 88 $ 119 $ 25 $ 3,287 The following is an aging analysis of past due loans by portfolio segment as of March 31, 2024 and December 31, 2023 including non-accrual loans without an ACL: March 31, 2024: (Dollars in thousands) 30-59 Days 60-89 Days 90 + Days Total Past Due Current Total Loans Non-Accrual CRE $ — $ — $ — $ — $ 87,779 $ 87,779 $ — MF — — — — 7,493 7,493 — C+I — — — — 25,394 25,394 — ADL — — — — 15,205 15,205 — RES — — 127 127 270,638 270,765 127 HELOC — — 14 14 15,216 15,230 14 CON — — — — 9,985 9,985 — $ — $ — $ 141 $ 141 $ 431,710 $ 431,851 $ 141 December 31, 2023: (Dollars in thousands) 30-59 60-89 90 + Total Current Total Non- CRE $ — $ — $ — $ — $ 86,566 $ 86,566 $ — MF — — — — 7,582 7,582 — C+I — — — — 25,511 25,511 — ADL — — — — 17,520 17,520 — RES — 131 — 131 268,812 268,943 127 HELOC — — 14 14 14,079 14,093 14 CON — — — — 9,816 9,816 — $ — $ 131 $ 14 $ 145 $ 429,886 $ 430,031 $ 141 The Company's collateral-dependent non-accrual RES and HELOC loans with one borrower had an amortized cost basis of $ 141,000 at March 31, 2024 and December 31, 2023, and was secured by real estate with an appraised value of $ 216,000 . There was no significant change in the extent to which the collateral secures the loan. Interest income recognized on non-accrual loans during three months ended March 31, 2024 and 2023 was $- 0 -. There were no loans past due over 90 days still accruing interest at March 31, 2024 and December 31, 2023. There were no loans collateralized by residential real estate property in the process of foreclosure at March 31, 2024 and December 31, 2023. There were no loans modified for borrowers experiencing financial difficulty during the three months ended March 31, 2024 and 2023. An assessment of whether a borrower is experiencing financial difficulty is made on the date of a modification, if applicable. The ACL incorporates an estimate of lifetime expected credit losses and is recorded on each asset upon origination. Because the effect of most modifications made to borrowers experiencing financial difficulty would already be included in the ACL as a result of the measurement methodologies used to estimate the allowance, a change in the ACL is generally not recorded upon modification. Credit Quality Information The Company utilizes a ten-grade internal loan rating system for its commercial real estate, multifamily, commercial and industrial, and acquisition, development, and land loans. Residential real estate, home equity line of credit and consumer loans are considered “pass” rated loans until they become delinquent. Once delinquent, loans can be rated an 8, 9 or 10 as applicable. Loans rated 1 through 6: Loans in these categories are considered “pass” rated loans with low to average risk. Loans rated 7: Loans in this category are considered “special mention.” These loans are starting to show signs of potential weakness and are being closely monitored by management. Loans rated 8: Loans in this category are considered “substandard.” Generally, a loan is considered substandard if it is inadequately protected by the current net worth and paying capacity of the obligors and/or the collateral pledged. There is a distinct possibility that the Bank will sustain some loss if the weakness is not corrected. Loans rated 9: Loans in this category are considered “doubtful.” Loans classified as doubtful have all the weaknesses inherent in those classified substandard with the added characteristic that the weaknesses make collection or liquidation in full, on the basis of currently existing facts, highly questionable and improbable. Loans rated 10: Loans in this category are considered uncollectible (“loss”) and of such little value that their continuance as loans is not warranted and should be charged off. On an annual basis, or more often if needed, the Company formally reviews the ratings on its commercial and industrial, commercial real estate and multifamily loans. On a periodic basis, the Company engages an independent third party to review a significant portion of loans within these segments and to assess the credit risk management practices of its commercial lending department. Management uses the results of these reviews as part of its annual review process, adequacy of the ACL on loans and overall credit risk administration. On a quarterly basis, the Company formally reviews the ratings on its applicable residential real estate and home equity loans if they have become classified as non-accrual. Criteria used to determine ratings consist of loan-to-value ratios and days delinquent. Based upon the most recent analysis performed, the risk category of loans by portfolio segment by vintage, reported under the CECL methodology, was as follows as of March 31, 2024 and December 31, 2023: March 31, 2024: (Dollars in thousands) 2024 2023 2022 2021 2020 Prior Revolving Loans Amortized Cost Basis Revolving Loans Converted to Term Total CRE: Risk rating: Pass $ 1,298 $ 7,949 $ 10,655 $ 11,498 $ 1,595 $ 20,623 $ 33,926 $ — $ 87,544 Special mention — — — — — 235 — — 235 Substandard — — — — — — — — — Total CRE 1,298 7,949 10,655 11,498 1,595 20,858 33,926 — 87,779 MF: Risk rating: Pass — — 142 5,113 1,069 836 333 — 7,493 Special mention — — — — — — — — — Substandard — — — — — — — — — Total MF — — 142 5,113 1,069 836 333 — 7,493 C+I: Risk rating: Pass 1,220 5,604 6,357 3,767 2,739 3,151 2,556 — 25,394 Special mention — — — — — — — — — Substandard — — — — — — — — — Total C+I 1,220 5,604 6,357 3,767 2,739 3,151 2,556 — 25,394 ADL: Risk rating: Pass 97 11,569 593 1,502 — 1,444 — — 15,205 Special mention — — — — — — — — — Substandard — — — — — — — — — Total ADL 97 11,569 593 1,502 — 1,444 — — 15,205 RES: Risk rating: Pass 8,420 14,888 47,659 60,073 50,784 88,814 — — 270,638 Special mention — — — — — — — — — Substandard — — — — — 127 — — 127 Total RES 8,420 14,888 47,659 60,073 50,784 88,941 — — 270,765 HELOC: Risk rating: Pass — — — — — — 15,216 — 15,216 Special mention — — — — — — — — — Substandard — — — — — — 14 — 14 Total HELOC — — — — — — 15,230 — 15,230 CON: Risk rating: Pass 518 2,780 3,013 1,932 1,476 266 — — 9,985 Special mention — — — — — — — — — Substandard — — — — — — — — — Total CON 518 2,780 3,013 1,932 1,476 266 — — 9,985 Total $ 11,553 $ 42,790 $ 68,419 $ 83,885 $ 57,663 $ 115,496 $ 52,045 $ — $ 431,851 December 31, 2023: (Dollars in thousands) 2023 2022 2021 2020 2019 Prior Revolving Loans Amortized Cost Basis Revolving Loans Converted to Term Total CRE: Risk rating: Pass $ 7,552 $ 10,849 $ 11,977 $ 2,268 $ 2,724 $ 18,713 $ 32,244 $ — $ 86,327 Special mention — — — — — 239 — — 239 Substandard — — — — — — — — — Total CRE 7,552 10,849 11,977 2,268 2,724 18,952 32,244 — 86,566 MF: Risk rating: Pass — 145 5,157 1,081 — 852 347 — 7,582 Special mention — — — — — — — — — Substandard — — — — — — — — — Total MF — 145 5,157 1,081 — 852 347 — 7,582 C+I: Risk rating: Pass 5,745 6,580 4,151 2,875 1,537 1,917 2,704 — 25,509 Special mention — — 2 — — — — — 2 Substandard — — — — — — — — — Total C+I 5,745 6,580 4,153 2,875 1,537 1,917 2,704 — 25,511 ADL: Risk rating: Pass 10,511 4,048 1,507 — 1,454 — — — 17,520 Special mention — — — — — — — — — Substandard — — — — — — — — — Total ADL 10,511 4,048 1,507 — 1,454 — — — 17,520 RES: Risk rating: Pass 19,533 43,517 64,226 50,675 20,021 70,844 — — 268,816 Special mention — — — — — — — — — Substandard — — — — — 127 — — 127 Total RES 19,533 43,517 64,226 50,675 20,021 70,971 — — 268,943 HELOC: Risk rating: Pass — — — — — — 14,079 — 14,079 Special mention — — — — — — — — — Substandard — — — — — — 14 — 14 Total HELOC — — — — — — 14,093 — 14,093 CON: Risk rating: Pass 2,902 3,145 1,966 1,512 215 76 — — 9,816 Special mention — — — — — — — — — Substandard — — — — — — — — — Total CON 2,902 3,145 1,966 1,512 215 76 — — 9,816 Total $ 46,243 $ 68,284 $ 88,986 $ 58,411 $ 25,951 $ 92,768 $ 49,388 $ — $ 430,031 Certain directors and executive officers of the Company and entities in which they have significant ownership interests are customers of the Company. Loans outstanding to these persons and entities at March 31, 2024 and December 31, 2023 were $ 5.0 million and $ 5.2 million, respectively.

Loan Servicing

Loan Servicing	3 Months Ended
	Mar. 31, 2024
Transfers And Servicing [Abstract]
Loan Servicing	4. Loan Servicing Loans serviced for others are not included in the accompanying consolidated balance sheets. The unpaid principal balances of such loans were $ 33.2 million and $ 33.9 million at March 31, 2024 and December 31, 2023, respectively. Substantially all of these loans were originated by the Bank and sold to third parties on a non-recourse basis with servicing rights retained. These retained servicing rights are recorded as a servicing asset and are initially recorded at fair value (see Note 15, Fair Values of Assets and Liabilities, for more information). Changes to the balance of mortgage servicing rights are recorded in loan servicing income in the Company’s consolidated statements of (loss) income. The Company’s mortgage servicing activities include: collecting principal, interest and escrow payments from borrowers; making tax and insurance payments on behalf of borrowers; monitoring delinquencies and executing foreclosure proceedings; and accounting for and remitting principal and interest payments to investors. Loan servicing income, including late and ancillary fees, was $ 11,000 and $ 15,000 for the three months ended March 31, 2024 and 2023, respectively. The Company's residential mortgage investor loan servicing portfolio is primarily comprised of fixed rate loans concentrated in the Company’s market areas. The following summarizes activity in mortgage servicing rights for the three months ended March 31, 2024 and 2023: (Dollars in thousands) 2024 2023 Balance, December 31, $ 339 $ 357 Payoffs ( 1 ) ( 3 ) Change in fair value due to change in assumptions ( 9 ) ( 5 ) Balance, March 31, $ 329 $ 349

Deposits

Deposits	3 Months Ended
	Mar. 31, 2024
Deposits [Abstract]
Deposits	5. Deposits Deposits consisted of the following at March 31, 2024 and December 31, 2023: (Dollars in thousands) March 31, 2024 December 31, 2023 NOW and demand deposits $ 160,731 $ 163,316 Money market deposits 86,552 85,364 Savings deposits 64,463 64,823 Time deposits of greater than $250,000 18,222 17,107 Time deposits of $250,000 or less 75,627 74,188 $ 405,595 $ 404,798 At March 31, 2024, the scheduled maturities of time deposits were as follows: (Dollars in thousands) Total 2024 $ 73,036 2025 16,945 2026 2,981 2027 596 2028 224 2029 67 $ 93,849 There were $ 23.6 million of brokered time deposits which were bifurcated into amounts below the FDIC insurance limit at March 31, 2024 and December 31, 2023. Additionally, there were $ 21.2 million and $ 20.9 million of brokered deposits included in savings deposits at March 31, 2024 and December 31, 2023, respectively. Reciprocal deposits were $ 920,000 and $ 1.1 million at March 31, 2024 and December 31, 2023, respectively. Deposits from related parties totaled $ 11.9 million and $ 10.7 million at of March 31, 2024 and December 31, 2023, respectively.

Borrowings

Borrowings	3 Months Ended
	Mar. 31, 2024
Debt Disclosure [Abstract]
Borrowings	6. Borrowings Federal Home Loan Bank (“FHLB” ) All borrowings from the FHLB are secured by a blanket security agreement on qualified collateral, principally residential mortgage loans and certain U.S. government sponsored mortgage-backed securities, in an aggregate amount equal to outstanding advances. The Bank’s unused remaining available borrowing capacity at the FHLB was approximately $ 66.4 million and $ 71.8 million at March 31, 2024 and December 31, 2023, respectively. At March 31, 2024 and December 31, 2023, the Bank had sufficient collateral at the FHLB to support its obligations and was in compliance with the FHLB’s collateral pledging program. A summary of borrowings from the FHLB is as follows: March 31, 2024 Principal Amounts Maturity Dates Interest Rates (Dollars in thousands) $ 26,544 2024 0.00 % to 5.53 % – fixed 520 2025 0.00 % – fixed 50,000 2026 4.38 % to 4.48 % – fixed 718 2028 0.00 % – fixed 200 2030 0.00 % – fixed 430 2031 0.00 % – fixed $ 78,412 December 31, 2023 Principal Amounts Maturity Dates Interest Rates (Dollars in thousands) $ 21,139 2024 0.00 % to 5.53 %– fixed 520 2025 0.00 % – fixed 50,000 2026 4.38 % to 4.48 % – fixed 718 2028 0.00 % – fixed 200 2030 0.00 % – fixed 430 2031 0.00 % – fixed $ 73,007 Included in the above borrowings from the FHLB at March 31, 2024 and December 31, 2023 is a $ 25.0 million long-term advance, with an interest rate of 4.48 %, which is callable by the FHLB on May 2, 2024 and quarterly thereafter, and a $ 25.0 million long-term advance, with an interest rate of 4.38 %, which is callable by the FHLB on December 8, 2025 and quarterly thereafter (see Note 15, Subsequent Events, for more information). As of March 31, 2024 and December 31, 2023 borrowings from the FHLB also include $ 2.7 million of advances through the FHLB’s Jobs for New England program where certain qualifying small business loans that create or preserve jobs, expand woman-, minority- or veteran-owned businesses, or otherwise stimulate the economy in New England communities are offered at an interest rate of 0 %. At March 31, 2024 and December 31, 2023, the Bank had an overnight line of credit with the FHLB that may be drawn up to $ 3.0 million. Additionally, the Bank had a total of $ 5.0 million of unsecured Fed Funds borrowing lines of credit with two correspondent banks. The entire balance of all these credit facilities was available at March 31, 2024 and December 31, 2023. Federal Reserve Bank of Boston (“FRB”) The Bank has established two secured credit facilities with the FRB – Bank Term Funding Program (“BTFP”) and Borrower-In-Custody of Collateral Program (“BIC”). As of March 31, 2024 and December 31, 2023, a $ 20.0 million BTFP advance is outstanding and collateralized by eligible collateral consisting primarily of government-sponsored enterprise obligations, mortgage-backed securities and collateralized mortgage obligations issued by various U.S. Government agencies, owned as of March 12, 2023, December 31, 2023 and March 31, 2024. The advance matures on December 13, 2024 at a fixed annual rate of 4.89 %. The interest rate for term advances under the BTFP are based upon the one-year overnight index swap rate plus 10 basis points and fixed for the term of the advance – up to one year - on the day the advance is made. Advances under the BIC would be collateralized by eligible collateral - principally general obligation municipal bonds. The entire $ 49.5 million borrowing capacity of the BIC was available at March 31, 2024.

Financial Instruments with Off-

Financial Instruments with Off-Balance Sheet Credit Exposures	3 Months Ended
	Mar. 31, 2024
Credit Loss [Abstract]
Financial Instruments with Off-Balance Sheet Credit Exposures	7. Financial Instruments with Off-Balance Sheet Credit Exposures The Company is party to financial instruments with off-balance sheet risk in the normal course of business to meet the financing needs of its customers. These financial instruments include commitments to originate loans, unadvanced funds on loans and standby letters of credit. The instruments involve, to varying degrees, elements of credit risk in excess of the amount recognized in the consolidated balance sheets. The contract amounts of those instruments reflect the extent of involvement the Company has in particular classes of financial instruments. The Company’s exposure to credit loss in the event of nonperformance by the other party to the financial instrument for loan commitments and standby letters of credit is represented by the contractual amounts of those instruments. The Company uses the same credit policies in making commitments and conditional obligations as it does for on-balance sheet instruments. Commitments to originate loans are agreements to lend to a customer provided 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. Since many of the commitments are expected to expire without being drawn upon, the total commitment amounts do not necessarily represent future cash requirements. The Company evaluates each customer’s creditworthiness on a case-by-case basis. The amount of collateral obtained, if deemed necessary by the Company upon extension of credit, is based on management’s credit evaluation of the borrower. Collateral held varies, but generally includes secured interests in mortgages. Standby letters of credit are conditional commitments issued by the Company to guarantee performance by a customer to a third-party. The credit risk involved in issuing letters of credit is essentially the same as that involved in extending loan facilities to customers. In the ordinary course of business, the Company may be subject to various legal proceedings. Management, after consultation with legal counsel, believes that the liabilities, if any, arising from such proceedings will not be material to the consolidated balance sheet or consolidated statements of (loss) income. Notional amounts of financial instruments with off-balance sheet credit risk are approximately as follows as of March 31, 2024 and December 31, 2023 : 2024 2023 Unadvanced portions of loans $ 58,061 $ 46,175 Commitments to originate loans 24,401 34,074 Standby letters of credit 125 125 The Company records an ACL for off-balance sheet credit exposures that are not unconditionally cancelable through a charge to the provision for credit losses on the Company’s consolidated statements of (loss) income. At March 31, 2024 and December 31, 2023 the ACL for off-balance sheet credit exposure totaled $ 341,000 and $ 391,000 , respectively, and was included in other liabilities on the Company’s consolidated balance sheets. The (release) provision for credit losses for off-balance sheet credit exposures for the three months ended March 31, 2024 and 2023 was $( 50,000 ) and $ 30,000 , respectively.

Employee Benefits

Employee Benefits	3 Months Ended
	Mar. 31, 2024
Compensation And Retirement Disclosure [Abstract]
Employee Benefits	8. Employee Benefits 401(k) Plan The Company sponsors a 401(k) defined contribution plan for substantially all employees pursuant to which employees of the Company could elect to make contributions to the plan subject to Internal Revenue Service limits. The Company makes matching and profit-sharing contributions to eligible participants in accordance with plan provisions. The Company’s contributions for the three months ended March 31, 2024 and 2023 were $ 59,000 and $ 56,000 , respectively. Supplemental Executive Retirement Plans Salary Continuation Plan The Company maintains a nonqualified supplemental retirement plan for its current President and its former President. The plan provides supplemental retirement benefits payable in installments over a period of years upon retirement or death. The recorded liability at March 31, 2024 and December 31, 2023 relating to this supplemental retirement plan was $ 758,000 and $ 735,000 , respectively. The discount rate used to determine the Company’s obligation was 5.00 %. The projected rate of salary increase for its current President was 3 %. The expense of this salary retirement plan was $ 37,000 and $ 33,000 for the three months ended March 31, 2024 and 2023, respectively. Directors Deferred Supplemental Retirement Plan The Company has a supplemental retirement plan for eligible directors that provides for monthly benefits based upon years of service to the Company, subject to certain limitations as set forth in the agreements. The present value of these future payments is being accrued over the estimated period of service. The estimated liability at March 31, 2024 and December 31, 2023 relating to this plan was $ 566,000 and $ 581,000 , respectively. The discount rate used to determine the Company’s obligation was 6.25 % at March 31, 2024 and December 31, 2023 . Total supplemental retirement plan expense amounted to $ 15,000 and $ 18,000 for the three months ended March 31, 2024 and 2023, respectively. The Company enacted a “hard freeze” for this supplemental retirement plan as of January 1, 2022. On February 10, 2022, the Bank and the non-employee members of the board of directors of the Bank entered into amendments to the Supplemental Director Retirement Agreements (the “Agreements”) previously entered into by the Bank and the directors. The amendments eliminate the formula for determining the normal annual retirement benefit (previously “ 70 % of Final Base Fee”) and replaces it with a fixed annual benefit of $ 20,000 . The amendments also eliminate the formula for determining the benefit payable on a change in control (previously tied to the normal annual retirement formula with certain imputed increases in the Base Fee) and replacing it with a fixed amount equal to the present value of $ 200,000 . The effect of the amendments is to eliminate the variable and increasing costs associated with the Agreements. Instead, since the normal annual retirement benefit will be a fixed amount, the future costs associated with the Agreements is now more predictable. It is the intention of the Bank that no new directors of the Bank would enter into similar agreements. Additionally, the Company has a deferred director’s fee plan, which allows members of the board of directors to defer the receipt of fees that otherwise would be paid to them in cash. At March 31, 2024 and December 31, 2023 , the total deferred directors' fees amounted to $ 757,000 and $ 718,000 , respectively.

Stock Based Compensation

Stock Based Compensation	3 Months Ended
	Mar. 31, 2024
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]
Stock Based Compensation	9. Stock Based Compensation Employee Stock Ownership Plan The Company maintains the First Seacoast Bank Employee Stock Ownership Plan (“ESOP”) to provide eligible employees of the Company the opportunity to own Company stock. The ESOP is a tax-qualified retirement plan for the benefit of Company employees. Contributions are allocated to eligible participants on the basis of compensation, subject to federal limits. The number of shares committed to be released per year through 2047 is 15,354 . The Company uses the principal and interest method to determine the release of shares amount. The ESOP funded its purchase of 423,715 shares through a loan from the Company equal to 100 % of the aggregate purchase price of the common stock. The ESOP trustee is repaying the loan principally through the Bank’s contributions to the ESOP over the remaining loan term that matures on December 31, 2047. At March 31, 2024 and December 31, 2023, the remaining principal balance on the ESOP debt was $ 4.2 million. Under applicable accounting requirements, the Company records compensation expense for the ESOP equal to fair market value of shares when they are committed to be released from the suspense account to participants’ accounts under the plan. Total compensation expense recognized in connection with the ESOP for the three months ended March 31, 2024 and 2023 was $ 32,000 and $ 38,000 , respectively. At March 31, 2024 and December 31, 2023, total unearned compensation for the ESOP was $ 4.0 million. March 31, 2024 December 31, Shares held by the ESOP include the following: Allocated 55,218 39,864 Committed to be allocated 3,839 15,354 Unallocated 364,658 368,497 Total 423,715 423,715 The fair value of unallocated shares was approximately $ 3.1 million and $ 2.8 million at March 31, 2024 and December 31, 2023, respectively. Equity Incentive Plan Effective May 27, 2021, the Company adopted the First Seacoast Bancorp 2021 Equity Incentive Plan (the “2021 Plan”). The Company’s stockholders approved the 2021 plan on that date. The 2021 Plan provides for the granting of incentive and non-statutory stock options to purchase shares of common stock and the granting of shares of restricted stock awards and restricted stock units. The 2021 Plan authorizes the issuance or delivery to participants of up to 348,801 converted shares of common stock (adjusted for the second step conversion transaction). Of this number, the maximum number of shares of common stock that may be issued pursuant to the exercise of stock options is 249,144 shares (adjusted for the second step conversion transaction) and the maximum number of shares of common stock that may be issued as restricted stock awards or restricted stock units is 99,657 shares (adjusted for the second step conversion transaction). The exercise price of stock options may not be less than the fair market value on the date the stock option is granted. Further, stock options may not be granted with a term that is longer than 10 years. On May 25, 2023, 249,144 incentive and non-statutory stock options to purchase shares of common stock were granted to directors for their services on the board of directors and certain members of management. The Company estimates the grant date fair value of each option using the Black-Scholes option pricing model. The use of the Black-Scholes option pricing model requires management to make assumptions with respect to the expected term of the option, the expected volatility of the common stock consistent with the expected life of the option, risk-free interest rates and expected dividend yields of the common stock. Since it was determined that the Company lacked sufficient historical closing stock prices, the expected volatility assumption was based upon a combination of actual historical volatility combined with the historical volatility developed for comparable companies. Also, since the Company lacked the appropriate historical data, the expected term of the option was calculated using the simplified method. Forfeitures are required to be estimated at the time of grant and revised, if necessary, in subsequent periods if actual forfeitures differ from those estimates. The estimated grant date fair value of each option is expensed as employee benefits expense ratably over the vesting period. The expense recognized for this equity incentive plan was $ 62,000 and $- 0 -, for the three months ended March 31, 2024 and 2023, respectively, which provided a tax benefit of $ 17,000 and $- 0 -, respectively. At March 31, 2024 and December 31, 2023, total unrecognized compensation expense for this equity incentive plan was $ 536,000 and $ 598,000 , respectively, with a 2.2 and 2.4 year weighted average future recognition period, respectively. A summary of stock options outstanding as of March 31, 2024 and changes during the three months ended March 31, 2024 is presented below: March 31, 2024 Number of Shares Weighted Average Exercise Price Weighted Average Remaining Contractual Term (in Years) Aggregate Intrinsic Value Stock options: (In Thousands) Balance at beginning of period 249,144 $ 8.06 9.1 $ — Granted — — — — Vested — — — — Forfeited — — — — Balance at end of period 249,144 $ 8.06 9.1 $ 80 Date of grant 5/25/2023 Options granted 249,144 Exercise price $ 8.06 Vesting period (1) 3 years Expiration date 5/25/2033 Expected volatility 27.8 % Expected term 6.5 years Expected dividend yield 0 % Expected forfeiture rate 0 % Risk free interest rate 3.9 % Fair value per option $ 3.00 (1) Vesting is ratably and the period begins on the date of the grant. On June 1, 2023, 2,478 restricted stock awards were granted to a certain member of management at $ 7.99 per share. The total fair value related to the June 1, 2023 grant was $ 20,000 . These restricted stock awards time-vest 50 % as of November 18, 2023 and 50 % as of November 18, 2024 and have been fair valued as of the date of grant. On November 18, 2021, 98,850 restricted stock awards were granted to directors and certain members of management at $ 11.95 per share (adjusted for the second step conversion transaction). The total fair value related to the November 18, 2021 grant was $ 1.2 million. Restricted stock awards time-vest over a three year period and have been fair valued as of the date of grant. The holders of restricted stock awards participate fully in the rewards of stock ownership of the Company, including voting rights when granted and dividend rights when vested. A summary of non-vested restricted shares outstanding as of March 31, 2024 and December 31, 2023 and changes during the periods then ended is presented below: Three Months Ended March 31, 2024 Number of Shares Weighted Average Grant Value Restricted stock: Non-vested at beginning of period 33,629 $ 11.80 Granted — — Vested — — Forfeited — — Non-vested at end of period 33,629 $ 11.80 Year Ended December 31, 2023 Restricted stock: Non-vested at beginning of year 64,785 $ 11.95 Granted 2,478 7.99 Vested ( 33,634 ) 11.80 Forfeited — — Non-vested at end of year 33,629 $ 11.80 For the three months ended March 31, 2024 and 2023, the expense recognized for this equity incentive plan was $ 102,000 and $ 97,000 , respectively, which provided a tax benefit of $ 27,000 and $ 26,000 , respectively. At March 31, 2024 and December 31, 2023, total unrecognized compensation expense for this equity incentive plan was $ 248,000 and $ 350,000 , respectively, with a 0.6 and 0.9 year weighted average future recognition period, respectively.

Leases

Leases	3 Months Ended
	Mar. 31, 2024
Leases [Abstract]
Leases	10. Leases The Company is obligated under various lease agreements for one of its branch offices and certain equipment. These agreements are accounted for as operating leases and their terms expire between 2024 and 2031 and, in some instances, contain options to renew for periods up to four years . The Company has no financing leases. The Company recognizes its operating leases on the consolidated balance sheet by recording a net lease liability, representing the Company’s legal obligation to make these lease payments, and a Right-Of-Use (“ROU”) asset, representing the Company’s legal right to use the leased assets. The Company, by policy, does not include renewal options for leases as part of its ROU asset and lease liabilities unless they are deemed reasonably certain to exercise. The Company does not have any sub-lease agreements. The following table summarizes information related to the Company’s right-of-use asset and net lease liability: March 31, 2024 Operating Leases Balance Sheet Location (Dollars in thousands) Right-of-use asset $ 561 Other Assets Net lease liability 561 Other Liabilities December 31, 2023 Operating Leases Balance Sheet Location (Dollars in thousands) Right-of-use asset $ 587 Other Assets Net lease liability 587 Other Liabilities The Company determines whether a contract contains a lease based on whether a contract, or a part of a contract, conveys the right to control the use of an identified asset for a period of time in exchange for consideration. The discount rate is either implicit in the lease or, when a rate cannot be readily determined, the Company’s incremental borrowing rate is used. The incremental borrowing rate is the rate of interest that the Company would have to pay to borrow on a collateralized basis over a similar term. During 2023, the Company completed a conversion of all of its branch ATMs from owned equipment to leased equipment and recognized a $ 2,000 loss on the disposition of all ATM-related equipment. The Company's obligation under the operating lease related to these ATMs expires in August 2030 and has future lease payments of $ 490,000 as of March 31, 2024. Total lease expense was $ 19,000 and $- 0 - for the three months ended March 31, 2024 and 2023, respectively. The Company's obligation under the operating lease related to one of its branches expires in August 2027 and has future lease payments of $ 142,000 as of March 31, 2024. Total lease expense was $ 10,000 and $ 9,000 for the three months ended March 31, 2024 and 2023, respectively. This lease agreement contains clauses calling for escalation of minimum lease payments contingent on increases in LIBOR, or a similar replacement index, and the consumer price index. The components of operating lease cost and other related information are as follows for the three months ended March 31: 2024 2023 (Dollars in thousands) Operating lease cost $ 26 $ 11 Short-term lease cost — — Variable lease cost (cost excluded from lease payments) — — Sublease income — — Total operating lease cost 26 11 Other Information: Cash paid for amounts included in the measurement of lease liabilities - operating cash flows from operating leases $ 26 $ 11 Operating lease - operating cash flows (liability reduction) — — Weighted average lease term remaining (in years) 5.64 4.16 Weighted average discount rate 5.00 % 3.11 % The total minimum lease payments due in future periods for lease agreements in effect at March 31, 2024 were as follows: Future Minimum Lease Payments (Dollars in thousands) Remainder of 2024 $ 93 2025 122 2026 120 2027 107 2028 77 Thereafter 122 Total minimum lease payments 641 Less: interest ( 80 ) Total lease liability $ 561

Other Comprehensive (Loss) Inco

Other Comprehensive (Loss) Income	3 Months Ended
	Mar. 31, 2024
Disclosure Of Other Comprehensive Income Loss [Abstract]
Other Comprehensive (Loss) Income	11. Other Comprehensive (Loss) Income The Company reports certain items as “other comprehensive (loss) income” and reflects total accumulated other comprehensive (loss) income (“AOCI”) in the consolidated financial statements for all periods containing elements of other comprehensive income or loss. The following table presents a reconciliation of the changes in the components of other comprehensive income or loss for the dates indicated, including the amount of income tax expense or benefit allocated to each component of other comprehensive income or loss: Three Months Ended March 31, Reclassification Adjustments 2024 2023 Affected Line Item in (Dollars in thousands) Net amortization of bond premiums $ 150 $ 239 Interest on debt securities Tax effect ( 40 ) ( 64 ) Income tax expense 110 175 Net (loss) income Gains on termination of interest rate swaps — ( 849 ) Gain on termination of interest rate swaps Tax effect — 230 Income tax expense — ( 619 ) Net (loss) income Total reclassification adjustments $ 110 $ ( 444 ) The following tables present the changes in each component of AOCI for the periods indicated: (Dollars in thousands) Net Unrealized Gains (1) Net Unrealized Gains (Losses) on Cash Flow (1) AOCI (1) Balance at December 31, 2023 $ ( 5,944 ) $ — $ ( 5,944 ) Other comprehensive loss before ( 1,033 ) — ( 1,033 ) Amounts reclassified from AOCI 110 — 110 Other comprehensive loss ( 923 ) — ( 923 ) Balance at March 31, 2024 $ ( 6,867 ) $ — $ ( 6,867 ) Balance at December 31, 2022 $ ( 10,428 ) $ 701 $ ( 9,727 ) Other comprehensive income (loss) before 1,334 ( 82 ) 1,252 Amounts reclassified from AOCI 175 ( 619 ) ( 444 ) Other comprehensive income (loss) 1,509 ( 701 ) 808 Balance at March 31, 2023 $ ( 8,919 ) $ — $ ( 8,919 ) (1) All amounts are net of tax.

Regulatory Matters

Regulatory Matters	3 Months Ended
	Mar. 31, 2024
Disclosure Of Regulatory Matters [Abstract]
Regulatory Matters	12. Regulatory Matters The Bank is subject to various regulatory capital requirements administered by the federal banking agencies. Quantitative measures established by regulation to ensure capital adequacy require the Bank to maintain minimum amounts and ratios (set forth in the table below). As of March 31, 2024, the most recent notification from the Office of the Comptroller of the Currency categorized the Bank, as well capitalized under the regulatory framework, for prompt corrective action. To be categorized as well capitalized, the Bank must maintain minimum capital amounts and ratios as set forth in the following tables. There are no conditions or events since the notification that management believes have changed the Bank’s category. Management believes that, as of March 31, 2024 and December 31, 2023, the Bank met all capital adequacy requirements to which it was subject, including the capital conservation buffer, at those dates. The following table presents actual and required capital ratios as of March 31, 2024 and December 31, 2023 for the Bank under the Basel Committee on Banking Supervisions capital guidelines for U.S. banks (“Basel III Capital Rules”) as fully phased-in on January 1, 2019. Capital levels required to be considered well capitalized are based upon prompt corrective action regulations, as amended to reflect the changes under the Basel III Capital Rules. Minimum Minimum Minimum Capital Actual Requirement Capitalized Fully Phased-In (Dollars in thousands) Amount Ratio Amount Ratio Amount Ratio Amount Ratio March 31, 2024 Total Capital (to risk-weighted assets) $ 54,737 14.88 % $ 29,425 8.00 % $ 36,781 10.00 % $ 38,620 10.50 % Tier 1 Capital (to risk-weighted assets) 50,930 13.85 22,068 6.00 29,425 8.00 31,264 8.50 Tier 1 Capital (to average assets) 50,930 8.92 22,843 4.00 28,554 5.00 22,843 4.00 Common Equity Tier 1 (to risk-weighted assets) 50,930 13.85 16,551 4.50 23,908 6.50 25,747 7.00 Minimum Minimum Minimum Capital Actual Requirement Capitalized Fully Phased-In (Dollars in thousands) Amount Ratio Amount Ratio Amount Ratio Amount Ratio December 31, 2023 Total Capital (to risk-weighted assets) $ 55,701 15.32 % $ 29,090 8.00 % $ 36,363 10.00 % $ 38,181 10.50 % Tier 1 Capital (to risk-weighted assets) 51,878 14.27 21,818 6.00 29,090 8.00 30,908 8.50 Tier 1 Capital (to average assets) 51,878 9.19 22,592 4.00 28,240 5.00 22,592 4.00 Common Equity Tier 1 (to risk-weighted assets) 51,878 14.27 16,363 4.50 23,636 6.50 25,454 7.00

Derivatives and Hedging Activit

Derivatives and Hedging Activities	3 Months Ended
	Mar. 31, 2024
Derivative Instruments And Hedging Activities Disclosure [Abstract]
Derivatives and Hedging Activities	13. Derivatives and Hedging Activities The Company is exposed to certain risks arising from both its business operations and economic conditions. The Company principally manages its exposures to a wide variety of business and operational risks through management of its core business activities. The Company manages economic risks, including interest rate, liquidity, and credit risk primarily by managing the amount, sources, and duration of its assets and liabilities and the use of derivative financial instruments. Specifically, the Company enters into derivative financial instruments to manage exposures that arise from business activities that result in the receipt or payment of future known and uncertain cash amounts, the value of which are determined by interest rates. These derivative financial instruments are reported at fair value in other assets or other liabilities and are not reported on a net basis. Derivatives Designated as Hedging Instruments Cash Flow Hedges of Interest Rate Risk The Company’s objectives in using interest rate derivatives are to add stability to interest income and expense and to manage its exposure to interest rate movements. To accomplish these objectives, the Company primarily uses interest rate swaps as part of its interest rate risk management strategy. Interest rate swaps designated as cash flow hedges involve the receipt of variable amounts from a counterparty in exchange for the Company making fixed rate payments or the receipt of fixed rate amounts from a counterparty in exchange for the Company making variable rate payments over the life of the agreements without exchange of the underlying notional amount. The Company entered into two $ 5 million notional interest rate swaps that were designated as cash flow hedges on 90-day advances from FHLB. The purpose of these cash flow hedges was to reduce potential interest rate risk by swapping a variable rate borrowing to a fixed rate. Management deemed it prudent to limit the variability of these interest payments by entering into these interest rate swap agreements. These agreements provided for the Company to receive payments at a variable rate determined by a specific index (three-month LIBOR) in exchange for making payments at a fixed rate. Publication of LIBOR is expected to cease in September of 2024. The swap agreements allowed for substitution of an alternative reference rate such as the secured overnight financing rate (“SOFR”) at that time. On January 17, 2023, the Company terminated both of its interest rate swap derivative instruments at a gain of $ 849,000 . The Company recognized the change in fair value of these hedging instruments, previously accumulated in AOCI, as a gain on termination of interest rate swaps in its consolidated statement of (loss) income for the three months ended March 31, 2023 as it was determined that it was probable that the hedged forecasted transaction - the variability in cash flows related to 90-day advances from the FHLB - would not occur by the end of the original maturity dates of the hedging instruments. The use of derivatives for debt hedging as part of the Company's overall interest rate risk management strategy has been infrequent as the Company has utilized other interest rate risk management activities to achieve similar business purposes. Also, $ 536,000 of cash posted to the counterparty as collateral on these interest rate swaps contracts was returned to the Company. The changes in the fair value of interest rate swaps were reported in other comprehensive (loss) income and were subsequently reclassified into interest expense or income in the period that the hedged transactions affected earnings. The change in fair value for these derivative instruments for the three months ended March 31, 2024 and 2023, was $- 0 - and $( 112,000 ), respectively. Fair Value Hedges of Interest Rate Risk During 2023, the Company entered into interest rate contracts that were designated as fair value hedges utilizing a pay fixed interest rate swap to hedge portions of the residential mortgage loan portfolio's change in fair value attributable to the movement in the one-month SOFR. Additionally, the Company entered into an interest rate contract that was designated as fair value hedge utilizing a pay fixed interest rate swap to hedge a portion of the securities available-for-sale municipal bond portfolio's change in fair value attributable to the movement in the one-month SOFR. The Company is exposed to changes in the fair value of certain pools of fixed-rate assets due to changes in benchmark interest rates. The Company uses interest rate swaps to manage its exposure to changes in fair value on these instruments attributable to changes in the designated benchmark interest rate. The Company's interest rate swaps designated as fair value hedges involve the payment of fixed-rate amounts to a counterparty in exchange for the Company receiving variable-rate payments over the life of the agreement without the exchange of the underlying notional amount. The hedging strategy effectively converts these fixed-rate assets to SOFR floating rate assets for the term of the swap starting on the effective date. For derivatives designated and that qualify as fair value hedges, the gain or loss on the derivative as well as the offsetting loss or gain on the hedged item attributable to the hedged risk are recognized in interest income. As of March 31, 2024 and December 31, 2023, the following amounts were recorded on the balance sheet related to cumulative basis adjustment for fair value hedges: Location in Consolidated Balance Sheets Carrying Amount of Hedged Assets/(Liabilities) Cumulative Amount of Fair Value Hedging Adjustment Included in the Carrying Amount of the Hedged Assets/(Liabilities) (Dollars in thousands) March 31, 2024 December 31, 2023 March 31, 2024 December 31, 2023 Securities available-for-sale, at fair value $ 9,977 $ 10,126 $ ( 23 ) $ 126 Total loans 49,942 50,632 ( 58 ) 632 Total $ 59,919 $ 60,758 $ ( 81 ) $ 758 The carrying amount of the hedged asset located in “total loans” includes the amortized cost basis of closed portfolios of fixed-rate residential loans used to designate hedging relationships in which the hedged items are the stated amount of assets anticipated to be outstanding for the designated hedged period. At March 31, 2024 and December 31, 2023, the amortized cost basis of the closed portfolios of fixed-rate residential loans used in the hedging relationship was $ 60.0 million and $ 62.2 million, respectively; the cumulative basis adjustments associated with this hedging relationship was $( 58,000 ) and $ 632,000 , respectively; and the notional amount of the designated hedged item was $ 50.0 million. Under the "portfolio layer" approach, the Company designated a $ 50.0 million notional amount of portfolio assets that are not expected to be affected by prepayments, defaults and other factors affecting the timing and amount of cash flows of the designated hedged layer. The carrying amount of the hedged asset located in “securities available-for-sale, at fair value” includes the principal amount of municipal bonds used to designate hedging relationships in which the hedged items are the stated amount of assets anticipated to be outstanding for the designated hedged period. At March 31, 2024 and December 31, 2023, the par value of the municipal bonds used in this hedging relationship was $ 19.3 million; the cumulative basis adjustments associated with these hedging relationships was $( 23,000 ) and $ 126,000 , respectively; and the notional amount of the designated hedged items were $ 10.0 million. Under the "portfolio layer" approach, the Company designated a $ 10.0 million notional amount of portfolio assets that are not expected to be affected by prepayments, defaults and other factors affecting the timing and amount of cash flows of the designated hedged layer. The notional amounts of these agreements do not represent amounts exchanged by the parties and, thus, are not a measure of potential loss exposure. At March 31, 2024 and December 31, 2023, the Company’s fair value hedges had a remaining maturity of 2.48 and 2.73 years, respectively, an average pay fixed rate of 4.29 % and an average received rate of 5.32 %. Derivatives not Designated as Hedging Instruments Customer Loan Swaps Derivatives not designated as hedges are not speculative and result from a service the Company provides to certain commercial banking customers. On May 19, 2023, the Company entered into an interest rate swap with a commercial loan borrower. The Company executes interest rate swaps with customers to facilitate their respective risk management strategies. The interest rate swap contract with the commercial loan borrower allows them to convert floating-rate loan payments based on SOFR to fixed-rate loan payments. This interest rate swap is simultaneously hedged by an offsetting derivative that the Company executes with a third party, such that the Company minimizes its net risk exposure resulting from such transactions. As the interest rate derivatives associated with this program do not meet hedge accounting requirements, changes in the fair value of both the customer derivative and the offsetting derivative are recognized directly in earnings. The following table presents the fair value of the Company’s derivative financial instruments as well as their classification on the consolidated balance sheet: Derivative Assets Derivative Liabilities Notional Amount Location Fair Value Notional Amount Location Fair Value (Dollars in thousands) March 31, 2024 Derivatives designated as hedging instruments: Interest rate contracts - fair value hedge $ 60,000 Other assets $ 81 $ — Other liabilities $ — Total derivatives designated as hedging instruments $ 81 $ — Derivatives not designated as hedging instruments: Customer loan swaps $ 4,732 Other assets $ 22 $ 4,732 Other liabilities $ 22 Total derivatives not designated as hedging instruments $ 22 $ 22 December 31, 2023 Derivatives designated as hedging instruments: Interest rate contracts - cash flow hedge $ 60,000 Other assets $ — $ — Other liabilities $ 758 Total derivatives designated as hedging instruments $ — $ 758 Derivatives not designated as hedging instruments: Customer loan swaps $ 4,766 Other assets $ 90 $ 4,766 Other liabilities $ 90 Total derivatives not designated as hedging instruments $ 90 $ 90 Credit-risk-related Contingent Features By entering into derivative transactions, the Company is exposed to credit risk to the extent that counterparties to the derivative contracts do not perform as required. Should a counterparty fail to perform under the terms of a derivative contract, the Company’s credit exposure on interest rate swaps is limited to the net positive fair value and accrued interest of all swaps with each counterparty. The Company seeks to minimize counterparty credit risk through credit approvals, limits, and other monitoring procedures. Institutional counterparties must have an investment grade credit rating and be approved by the Company’s board of directors. As such, management believes the risk of incurring credit losses on derivative contracts with institutional counterparties is remote. As of March 31, 2024 and December 31, 2023, the Company posted $ 1.8 million and $ 1.6 million, respectively, of cash to the counterparties as collateral on its interest rate swap contracts and customer loan swaps, which was presented within cash and due from banks on the consolidated balance sheets. Balance Sheet Offsetting Certain financial instruments may be eligible for offset in the consolidated balance sheet and/or subject to master netting arrangements or similar agreements. The Company’s derivative transactions with institutional counterparties are generally executed under International Swaps and Derivative Association (“ISDA”) master agreements which include “right of set-off” provisions. In such cases there is generally a legally enforceable right to offset recognized amounts and there may be an intention to settle such amounts on a net basis. Generally, the Company does not offset such financial instruments for financial reporting purposes. The following tables present the information about derivative positions that are eligible for offset in the consolidated balance sheets as of March 31, 2024 and December 31, 2023: Gross Amounts Not Offset (Dollars in thousands) Gross Amounts Recognized Gross Amounts Offset Net Amounts Recognized Financial Instruments Pledged (Received) Cash Collateral Pledged (Received) (1) Net Amount March 31, 2024 Derivative Assets: Interest rate contracts(2) $ 81 $ — $ 81 $ — $ 81 $ — Customer loan swaps - dealer bank(3) 22 — 22 — — 22 Total $ 103 $ — $ 103 $ — $ 81 $ 22 Derivative Liabilities: Interest rate contracts(2) $ — $ — $ — $ — $ — $ — Customer loan swaps - commercial customer(3) 22 — 22 — 22 — Total $ 22 $ — $ 22 $ — $ 22 $ — December 31, 2023 Derivative Assets: Interest rate contracts(2) $ — $ — $ — $ — $ — $ — Customer loan swaps - dealer bank(3) 90 — 90 — 90 — Total $ 90 $ — $ 90 $ — $ 90 $ — Derivative Liabilities: Interest rate contracts(2) $ 758 $ — $ 758 $ — $ 758 $ — Customer loan swaps - commercial customer(3) 90 — 90 — — 90 Total $ 848 $ — $ 848 $ — $ 758 $ 90 (1) The amount presented was the lesser of the amount pledged (received) or the net amount presented in the consolidated balance sheets. (2) Interest rate swap contracts were completed with the same dealer bank. The Company maintains a master netting arrangement with the counterparty and settles collateral on a net basis for all contracts. (3) The Company manages its net exposure on its commercial customer loan swaps by obtaining collateral as part of the normal loan policy and underwriting practices. The Company does not post collateral to its commercial customers as part of its contract.

Fair Values of Assets and Liabi

Fair Values of Assets and Liabilities	3 Months Ended
	Mar. 31, 2024
Fair Value Disclosures [Abstract]
Fair Values of Assets and Liabilities	14. Fair Values of Assets and Liabilities Determination of Fair Value The fair value of an asset or liability is the price that would be received to sell an asset or paid to transfer a liability in an orderly transaction between market participants at the measurement date. The Company uses prices and inputs that are current as of the measurement date, including during periods of market dislocation. In periods of market dislocation, the observability of prices and inputs may be reduced for many instruments. This condition could cause an instrument to be reclassified from one level to another. Fair value is best determined based upon quoted market prices. However, in many instances, there are no quoted market prices for the Company’s various assets and liabilities. In cases where quoted market prices are not available, fair values are based on estimates using present value of cash flows or other valuation techniques. Those techniques are significantly affected by the assumptions used, including the discount rate and estimates of future cash flows. Accordingly, the fair value estimates may not be realized in an immediate settlement of the instrument. The Company groups its assets and liabilities measured at fair value in three levels, based on the markets in which the assets and liabilities are traded, and the observability and reliability of the assumptions used to determine fair value. Level 1 - Level 1 inputs are quoted prices (unadjusted) in active markets for identical assets or liabilities that the reporting entity has the ability to access at the measurement date. Level 2 - Level 2 inputs are inputs other than quoted prices included within Level 1 that are observable for the asset or liability, either directly or indirectly. Level 3 - Level 3 inputs are unobservable inputs for the asset or liability. For assets and liabilities, fair value is based upon the lowest level of observable input that is significant to the fair value measurement. In general, fair value is based upon quoted market prices, where available. If such quoted market prices are not available, fair value is based upon models that primarily use, as inputs, observable market-based parameters. The Company’s valuation methodologies may produce a fair value calculation that may not be indicative of net realizable value or reflective of future fair values. While management believes the Company’s valuation methodologies are appropriate and consistent with other market participants, the use of different methodologies or assumptions to determine the fair value of certain financial instruments could result in a different estimate of fair value at the reporting date. Furthermore, the reported fair value amounts have not been comprehensively revalued since the presentation dates, and, therefore, estimates of fair value after the balance sheet date may differ significantly from the amounts presented therein. A more detailed description of the valuation methodologies used for assets and liabilities measured at fair value is set forth below. A description of the valuation methodologies used for instruments measured at fair value, as well as the general classification of such instruments pursuant to the valuation hierarchy, is set forth below. These valuation methodologies were applied to all the Company’s financial assets and financial liabilities carried at fair value at March 31, 2024 and December 31, 2023. Financial Assets and Financial Liabilities: Financial assets and financial liabilities measured at fair value on a recurring basis include the following: Securities Available-for-Sale : The Company’s investment in U.S. Government-sponsored entities bonds, U.S Government agency small business administration pools guaranteed by the SBA, collateralized mortgage obligations issued by the FHLMC, residential mortgage-backed securities and other municipal bonds is generally classified within Level 2 of the fair value hierarchy. For these securities, the Company obtains fair value measurements from independent pricing services. The fair value measurements consider observable data that may include reported trades, dealer quotes, market spreads, cash flows, the U.S. treasury yield curve, trading levels, market consensus prepayment speeds, credit information and the instrument’s terms and conditions. Mortgage Servicing Rights : Fair value is based on a valuation model that calculates the present value of estimated future net servicing income. The valuation model utilizes interest rate, prepayment speed and default rate assumptions that market participants would use in estimating future net servicing income and that can be validated against available market data (see Note 4, Loan Servicing, for more information). These assumptions are inherently sensitive to change as these unobservable inputs are not based on quoted prices in active markets or otherwise observable. Derivative Instruments and Hedges: The valuation of these instruments is determined using the discounted cash flow method on the expected cash flows of each derivative. This analysis reflects the contractual terms of the derivatives, including the period to maturity, and uses observable market-based inputs, including interest rate curves and implied volatilities. The following table summarizes financial assets and liabilities measured at fair value on a recurring basis as of March 31, 2024 and December 31, 2023, segregated by the level of the valuation inputs within the fair value hierarchy utilized to measure fair value: Total Level 1 Level 2 Level 3 (Dollars in thousands) March 31, 2024 Securities available-for-sale: U.S. Government-sponsored enterprises obligations $ 1,380 $ — $ 1,380 $ — U.S Government agency small business administration 14,782 — 14,782 — Collateralized mortgage obligations issued by 5,474 — 5,474 — Residential mortgage-backed-securities 39,323 — 39,323 — Municipal bonds 53,494 — 53,494 — Corporate debt 493 — 493 — Corporate subordinated debt 9,253 — 9,253 — Other assets: Mortgage servicing rights 329 — — 329 Derivatives 103 — 103 — Other Liabilities: Derivatives 22 — 22 — Total Level 1 Level 2 Level 3 (Dollars in thousands) December 31, 2023 Securities available-for-sale: U.S. Government-sponsored enterprises obligations $ 1,398 $ — $ 1,398 $ — U.S Government agency small business administration 15,583 — 15,583 — Collateralized mortgage obligations issued by 2,474 — 2,474 — Residential mortgage-backed securities 38,221 — 38,221 — Municipal bonds 54,692 — 54,692 — Corporate debt 492 — 492 — Corporate subordinated debt 8,994 — 8,994 — Other assets: Mortgage servicing rights $ 339 — — 339 Derivatives 90 — 90 — Other liabilities: Derivatives 848 — 848 — For the three months ended March 31, 2024 and 2023, the changes in Level 3 assets and liabilities measured at fair value on a recurring basis were as follows: (Dollars in thousands) Mortgage Servicing Rights (1) Balance as of January 1, 2024 $ 339 Included in net (loss) income ( 10 ) Balance as of March 31, 2024 $ 329 Total unrealized net gains (losses) $ — Balance as of January 1, 2023 $ 357 Included in net (loss) income ( 8 ) Balance as of March 31, 2023 $ 349 Total unrealized net gains (losses) $ — (1) Realized and unrealized gains and losses related to mortgage servicing rights are reported as a component of loan servicing fee income in the Company’s consolidated statements of (loss) income. For Level 3 assets measured at fair value on a recurring basis as of March 31, 2024 and December 31, 2023, the significant unobservable inputs used in the fair value measurements were as follows: March 31, 2024 (Dollars in thousands) Valuation Technique Description Range Weighted Average (1) Fair Value Mortgage Servicing Rights Discounted Cash Flow Prepayment Rate 5.01 % - 17.31 % 6.67 % $ 329 Discount Rate 9.75 % 9.75 % Delinquency Rate 2.16 % - 2.77 % 2.27 % Default Rate 0.14 % - 0.18 % 0.15 % December 31, 2023 (Dollars in thousands) Valuation Technique Description Range Weighted Average (1) Fair Value Mortgage Servicing Rights Discounted Cash Flow Prepayment Rate 5.35 % - 20.53 % 6.85 % $ 339 Discount Rate 9.38 % 9.38 % Delinquency Rate 2.08 % - 2.60 % 2.17 % Default Rate 0.12 % - 0.14 % 0.14 % (1) Unobservable inputs for mortgage servicing rights were weighted by loan amount. The significant unobservable inputs used in the fair value measurement of the Company’s mortgage servicing rights are the weighted-average prepayment rate, weighted-average discount rate, weighted average delinquency rate and weighted-average default rate. Significant increases (decreases) in any of those inputs in isolation could result in a significantly lower (higher) fair value measurement. Although the prepayment rate and the discount rate are not directly interrelated, they generally move in opposite directions of each other. The Company estimates the fair value of mortgage servicing rights by using a discounted cash flow model to calculate the present value of estimated future net servicing income. Observable and unobservable inputs are entered into this model as prescribed by an independent third party to arrive at an estimated fair value. Certain financial assets and financial liabilities are measured at fair value on a non-recurring basis; that is, the instruments are not measured at fair value on an ongoing basis but are subject to fair value adjustments in certain circumstances (for example, when there is evidence of impairment). Financial assets measured at fair value on a non-recurring basis during the reported periods may include certain individually evaluated loans reported at the fair value of the underlying collateral. Fair value is measured using appraised values of collateral and adjusted as necessary by management based on unobservable inputs for specific properties. However, the choice of observable data is subject to significant judgment, and there are often adjustments based on judgment in order to make observable data comparable and to consider the impact of time, the condition of properties, interest rates and other market factors on current values. Additionally, commercial real estate appraisals frequently involve discounting of projected cash flows, which relies inherently on unobservable data. Therefore, real estate collateral related nonrecurring fair value measurement adjustments have generally been classified as Level 3. Estimates of fair value used for other collateral supporting commercial loans generally are based on assumptions not observable in the marketplace and therefore such valuations have been classified as Level 3. Financial assets measured at fair value on a non-recurring basis during the reported periods also include loans held for sale. Residential mortgage loans held for sale are recorded at the lower of cost or fair value and are therefore measured at fair value on a non-recurring basis. The fair values for loans held for sale are estimated based on commitments in effect from investors or prevailing market prices for loans with similar terms to borrowers of similar credit quality and are included in Level 3. At March 31, 2024 and December 31, 2023 , there were no assets or liabilities measured at fair value on a non-recurring basis. Non-Financial Assets and Non-Financial Liabilities: The Company has no non-financial assets or non-financial liabilities measured at fair value on a recurring basis. Non-financial assets measured at fair value on a non-recurring basis generally include certain foreclosed assets which, upon initial recognition, were remeasured and reported at fair value through a charge-off to the allowance for loan losses and certain foreclosed assets which, subsequent to their initial recognition, are remeasured at fair value through a write-down included in other non-interest expense. There were no foreclosed assets at March 31, 2024 or December 31, 2023. ASC Topic 825, “Financial Instruments,” requires disclosure of the fair value of financial assets and financial liabilities, including those financial assets and financial liabilities that are not measured and reported at fair value on a recurring basis or non-recurring basis. The methodologies for estimating the fair value of financial assets and financial liabilities that are measured at fair value on a recurring or non-recurring basis are discussed above. ASU 2016-01 requires public business entities to use the exit price notion when measuring the fair value of financial instruments for disclosure purposes. The exit price notion is a market-based measurement of fair value that is represented by the price to sell an asset or transfer a liability in the principal market (or most advantageous market in the absence of a principal market) on the measurement date. At March 31, 2024 and December 31, 2023, fair values of loans are estimated on an exit price basis incorporating discounts for credit, liquidity and marketability factors. Summary of Fair Values of Financial Instruments not Carried at Fair Value The estimated fair values, and related carrying or notional amounts, of the Company’s financial instruments at March 31, 2024 and December 31, 2023 are as follows: (Dollars in thousands) Carrying Fair Level 1 Level 2 Level 3 March 31, 2024 Financial Assets: Cash and due from banks $ 6,713 $ 6,713 $ 6,713 $ — $ — Federal Home Loan Bank stock 3,448 3,448 — 3,448 — Bank-owned life insurance 4,683 4,683 — 4,683 — Loans, net 428,431 381,372 — — 381,372 Accrued interest receivable 2,368 2,368 2,368 — — Financial Liabilities: Deposits $ 405,595 $ 404,371 $ 311,745 $ 92,626 $ — Advances from Federal Home Loan Bank 78,412 78,162 — 78,162 — Advances from Federal Reserve Bank 20,000 19,966 — 19,966 — Mortgagors’ tax escrow 2,079 2,079 — 2,079 — Accrued interest payable 644 644 644 — — December 31, 2023 Financial Assets: Cash and due from banks $ 6,069 $ 6,069 $ 6,069 $ — $ — Federal Home Loan Bank stock 2,986 2,986 — 2,986 — Bank-owned life insurance 4,663 4,663 — 4,663 — Loans, net 426,641 376,772 — — 376,772 Accrued interest receivable 2,294 2,294 2,294 — — Financial Liabilities: Deposits $ 404,798 $ 403,489 $ 313,503 $ 89,986 $ — Advances from Federal Home Loan Bank 73,007 73,162 — 73,162 — Advances from Federal Reserve Bank 20,000 20,020 — 20,020 — Mortgagors’ tax escrow 640 640 — 640 — Accrued interest payable 380 380 380 — —

Subsequent Events

Subsequent Events	3 Months Ended
	Mar. 31, 2024
Subsequent Events [Abstract]
Subsequent Events	15. Subsequent Events On April 11, 2024, the board of directors authorized a stock repurchase program for up to 507,707 shares of common stock, representing approximately 10 % of shares currently outstanding. The Company intends to conduct the repurchases on the open market, including by means of a trading plan adopted under SEC Rule 10b5-1,subject to market conditions and other factors. There is no guarantee as to the number of shares that the Company may ultimately repurchase. The program will expire 12 months after the effective date, regardless of whether all shares will have been repurchased. The Company may suspend or discontinue the program at any time. On April 17 , 2024, the Bank signed a purchase and sale agreement for the sale and leaseback of five properties owned and operated by the Bank, which consists of its main office and branch, a building annex used primarily by its FSB Wealth Management division and three standalone branches for an aggregate cash purchase price of $ 7.9 million. Each of the sold branches include an adjacent drive thru. All of the sold properties include an adjacent parking lot. The Bank will concurrently enter into absolute net lease agreements with the purchaser under which the Bank will lease each of the properties under an initial term of 15 years. We will not close any branches or exit any markets as a result of the sale-leaseback trans action. This transaction is expected to close during the second quarter of 2024. On April 29, 2024, the Company borrowed $ 25.0 million from the FHLB at a rate of 4.75 %, which is callable by the FHLB on October 29, 2024 and quarterly thereafter to replace the callable advance which was called on May 2, 2024 (see Note 6, Borrowings, for more information). On May 3, 2024, the Company purchased $ 5.7 million of brokered deposits, for a term of one year , at an annual rate of 5.20 %. The brokered deposits are callable, at the option of the Company, in whole, prior to the maturity date beginning on August 3, 2024 and quarterly thereafter. Also on May 3, 2024, the Company purchased $ 2.4 million of brokered deposits, for a term of two years , at an annual rate of 5.20 %. The brokered deposits are callable, at the option of the Company, in whole, prior to the maturity date beginning on November 3, 2024 and quarterly thereafter.

Summary of Significant Accoun_2

Summary of Significant Accounting Policies (Policies)	3 Months Ended
	Mar. 31, 2024
Accounting Policies [Abstract]
Basis of Presentation	Basis of Presentation The accompanying unaudited consolidated financial statements of the Company were prepared in accordance with generally accepted accounting principles in the United States of America (“U.S. GAAP”) for interim consolidated financial information, general practices within the banking industry and with instructions for Form 10-Q and Regulation S-X. Accordingly, these interim financial statements do not include all the information or footnotes required by U.S. GAAP for annual financial statements. However, in the opinion of management, all adjustments (consisting solely of normal recurring adjustments) necessary for a fair presentation of these consolidated financial statements have been included. The results of operations for the interim periods disclosed herein are not necessarily indicative of the results which may be expected for the entire year. These statements should be read in conjunction with the audited consolidated financial statements and notes thereto contained in the Annual Report on Form 10-K for the fiscal year ended December 31, 2023 , as filed with the U.S. Securities and Exchange Commission (“SEC”) on March 29, 2024.
Corporate Structure	Corporate Structure On January 19, 2023, the conversion of First Seacoast Bancorp, MHC from mutual to stock form and the related stock offering by First Seacoast Bancorp, Inc., the new holding company for First Seacoast Bank, was completed. As a result, both First Seacoast Bancorp, MHC and First Seacoast Bancorp ceased to exist. First Seacoast Bancorp, Inc.’s common stock began trading on the Nasdaq Capital Market under the trading symbol “FSEA” on January 20, 2023. As a result of the subscription offering, the community offering and the syndicated community offering, First Seacoast Bancorp, Inc. sold a total of 2,805,000 shares of its common stock at a price of $ 10.00 per share, which includes 224,400 shares sold to First Seacoast Bank’s Employee Stock Ownership Plan. As part of the conversion transaction, each outstanding share of First Seacoast Bancorp (a federal corporation) common stock owned by the public stockholders of First Seacoast Bancorp (a federal corporation) (stockholders other than First Seacoast Bancorp, MHC) as of the closing date was converted into shares of First Seacoast Bancorp, Inc. common stock based on an exchange ratio of 0.8358 shares of First Seacoast Bancorp, Inc. common stock for each share of First Seacoast Bancorp (a federal corporation) common stock. The Bank offers a full range of banking and wealth management services to its customers. The Bank focuses on four core services that center around customer needs. The core services include residential lending, commercial banking, personal banking and wealth management. The Bank offers a full range of commercial and consumer banking services through its network of five full-service branch locations. The Bank is engaged principally in the business of attracting deposits from the public and investing those funds in various types of loans, including residential and commercial real estate loans, and a variety of commercial and consumer loans. The Bank also invests its deposits and borrowed funds in investment securities. Deposits at the Bank are insured by the Federal Deposit Insurance Corporation (“FDIC”) for the maximum amount permitted by law. The Company has one reportable segment, “Banking Services.” All of the Company’s activities are interrelated, and each activity is dependent and assessed based on how each of the activities of the Company supports the others. For example, lending is dependent upon the ability of the Company to fund itself with deposits and other borrowings and manage interest rate and credit risk. Accordingly, all significant operating decisions are based upon analysis of the Company as one segment or unit. Investment management services are offered through FSB Wealth Management. FSB Wealth Management is a division of First Seacoast Bank. The division currently consists of two financial advisors who are located in Dover, New Hampshire. FSB Wealth Management provides access to non-FDIC insured products that include retirement planning, portfolio management, investment and insurance strategies, business retirement plans and college planning to individuals throughout our primary market area. These investments and services are offered through a third-party registered broker-dealer and investment advisor. FSB Wealth Management receives fees from advisory services and commissions on individual investment and insurance products purchased by clients. The assets held for wealth management customers are not assets of the Company and, accordingly, are not reflected in the Company’s consolidated balance sheets. On August 17, 2021, the Bank entered into a definitive agreement with an investment advisory and wealth management firm (the “seller”) to purchase certain of its client accounts and client relationships for a final adjusted purchase price of $ 324,000 . The client accounts purchased are recorded as a customer list intangible asset. Identifiable intangible assets that are subject to amortization will be reviewed for impairment, at least annually, based on their fair value. Any impairment will be recognized as a charge to earnings and the adjusted carrying amount of the intangible asset will become its new accounting basis. The remaining useful life of the intangible asset will also be evaluated each reporting period to determine whether events and circumstances warrant a revision to the remaining period of amortization. The Company is amortizing the customer list intangible on a straight-line basis over a ten-year period. During the three months ended March 31, 2024 and 2023, $ 8,000 and $ 9,000 of amortization expense was recorded in other expense, respectively. Customer list intangible balances included in other assets are $ 239,000 and $ 247,000 as of March 31, 2024 and December 31, 2023, respectively.
Recent Accounting Pronouncements Yet To Be Adopted	Recent Accounting Pronouncements Yet To Be Adopted As an “emerging growth company,” as defined in Title 1 of Jumpstart Our Business Startups (JOBS) Act, the Company has elected to use the extended transition period to delay adoption of new or reissued accounting pronouncements applicable to public companies until such pronouncements are made applicable to private companies. As a result, the Company’s consolidated financial statements may not be comparable to the financial statements of public companies that comply with such new or revised accounting standards without an extended transition period. As of March 31, 2024 , there was no significant difference in the comparability of the Company’s consolidated financial statements as a result of this extended transition period. The Company’s status as an “emerging growth company” will end on the earlier of: (i) the last day of the fiscal year of the Company during which it had total annual gross revenues of $1.235 billion (as adjusted for inflation) or more; (ii) the last day of the fiscal year of the Company following the fifth anniversary of the effective date of the Company’s initial public offering; (which will be December 31, 2024 for the Company) (iii) the date on which the Company has, during the previous three-year period, issued more than $1.0 billion in non-convertible debt; or (iv) the date on which the Company is deemed to be a “large accelerated filer” under Securities and Exchange Commission regulations (generally, at least $700 million of voting and non-voting equity held by non-affiliates). The Company considers the applicability and impact of all ASUs. ASUs not listed below were assessed and determined to be either not applicable or are expected to have an immaterial impact on the Company’s consolidated financial statements. In March 2024, the FASB issued ASU 2024-02, “Codification Improvements,” amends the Codification to remove references to various concepts statements and impacts a variety of topics in the Codification. The amendments apply to all reporting entities within the scope of the affected accounting guidance, but in most instances the references removed are extraneous and not required to understand or apply the guidance. Generally, the amendments in ASU 2024-02 are not intended to result in significant accounting changes for most entities. ASU 2024-02 is effective January 1, 2025 and is not expected to have a material impact on the Company's consolidated financial statements.

Securities Available-for-Sale (

Securities Available-for-Sale (Tables)	3 Months Ended
	Mar. 31, 2024
Available For Sale Securities [Abstract]
Schedule of amortized cost and fair value of securities available-for-sale	The amortized cost and fair value of securities available-for-sale, and the corresponding amounts of gross unrealized gains and losses for which an allowance for credit losses has not been recorded, are as follows as of March 31, 2024 and December 31, 2023: March 31, 2024 Amortized Gross Gross Fair (Dollars in thousands) U.S. Government-sponsored enterprises obligations $ 1,662 $ — $ ( 282 ) $ 1,380 U.S. Government agency small business administration 15,659 18 ( 895 ) 14,782 Collateralized mortgage obligations issued by the 6,012 — ( 538 ) 5,474 Residential mortgage-backed securities 42,743 534 ( 3,954 ) 39,323 Municipal bonds 56,926 787 ( 4,219 ) 53,494 Corporate debt 500 — ( 7 ) 493 Corporate subordinated debt 10,095 82 ( 924 ) 9,253 $ 133,597 $ 1,421 $ ( 10,819 ) $ 124,199 December 31, 2023 Amortized Gross Gross Fair (Dollars in thousands) U.S. Government-sponsored enterprises obligations $ 1,668 $ — $ ( 270 ) $ 1,398 U.S. Government agency small business administration 16,410 36 ( 863 ) 15,583 Collateralized mortgage obligations issued by the 2,958 — ( 484 ) 2,474 Residential mortgage-backed securities 41,186 653 ( 3,618 ) 38,221 Municipal bonds 57,192 1,087 ( 3,587 ) 54,692 Corporate debt 500 — ( 8 ) 492 Corporate subordinated debt 10,074 3 ( 1,083 ) 8,994 $ 129,988 $ 1,779 $ ( 9,913 ) $ 121,854
Schedule of amortized cost and fair values of securities available-for-sale by contractual maturity	The amortized cost and fair values of securities available-for-sale at March 31, 2024 by contractual maturity are shown below. Actual maturities may differ from contractual maturities because borrowers may have the right to call or prepay obligations with or without call or prepayment penalties. March 31, 2024 Amortized Fair Value (Dollars in thousands) Due in one year or less $ 1,784 $ 1,789 Due after one year through five years 500 493 Due after five years through ten years 10,917 9,734 Due after ten years 55,982 52,604 Total U.S. Government-sponsored enterprises obligations, 69,183 64,620 U.S. Government agency small business pools guaranteed (1) 15,659 14,782 Collateralized mortgage obligations issued by the FHLMC, (1) 6,012 5,474 Residential mortgage-backed securities (1) 42,743 39,323 Total $ 133,597 $ 124,199 (1) Actual maturities for these debt securities are dependent upon the interest rate environment and prepayments on the underlying loans.
Summary of gross unrealized losses and fair value for those investments with unrealized losses	The following is a summary of gross unrealized losses and fair value for those investments with unrealized losses for which an allowance for credit losses has not been recorded, aggregated by investment category and length of time the individual securities have been in a continuous unrealized loss position, at March 31, 2024 and December 31, 2023. Less than 12 Months More than 12 Months Total Number of Fair Unrealized Number of Fair Unrealized Fair Unrealized (Dollars in thousands) March 31, 2024 U.S. Government sponsored — $ — $ — 3 $ 1,380 $ ( 282 ) $ 1,380 $ ( 282 ) U.S. Government agency small 8 7,831 ( 65 ) 5 3,787 ( 830 ) 11,618 ( 895 ) Collateralized mortgage 2 3,069 ( 26 ) 4 2,405 ( 512 ) 5,474 ( 538 ) Residential mortgage- 6 5,592 ( 89 ) 23 14,788 ( 3,865 ) 20,380 ( 3,954 ) Municipal bonds 5 3,217 ( 69 ) 49 30,035 ( 4,150 ) 33,252 ( 4,219 ) Corporate debt — — — 1 493 ( 7 ) 493 ( 7 ) Corporate subordinated debt — — — 5 4,601 ( 924 ) 4,601 ( 924 ) 21 $ 19,709 $ ( 249 ) 90 $ 57,489 $ ( 10,570 ) $ 77,198 $ ( 10,819 ) December 31, 2023 U.S. Government sponsored — $ — $ — 3 $ 1,398 $ ( 270 ) $ 1,398 $ ( 270 ) U.S. Government agency small 8 8,432 ( 75 ) 5 3,899 ( 788 ) 12,331 ( 863 ) Collateralized mortgage — — — 4 2,474 ( 484 ) 2,474 ( 484 ) Residential mortgage- 5 4,806 ( 53 ) 23 15,347 ( 3,565 ) 20,153 ( 3,618 ) Municipal bonds 1 1,941 ( 10 ) 49 30,729 ( 3,577 ) 32,670 ( 3,587 ) Corporate debt — — — 1 492 ( 8 ) 492 ( 8 ) Corporate subordinated debt 4 4,080 ( 82 ) 4 4,029 ( 1,001 ) 8,109 ( 1,083 ) 18 $ 19,259 $ ( 220 ) 89 $ 58,368 $ ( 9,693 ) $ 77,627 $ ( 9,913 )
Summary of sales proceeds, principal payments received and gross realized gains and losses on available for sale securities	Proceeds from sales, maturities, principal payments received and gross realized gains and losses on securities available-for-sale were as follows for the three months ended March 31, 2024 and 2023: March 31, 2024 2023 (Dollars in thousands) Proceeds from sales, maturities and principal payments $ 1,258 $ 1,038 Gross realized gains — — Gross realized losses — — Net realized gains $ — $ —

Loans and Allowance for Credi_2

Loans and Allowance for Credit Losses on Loans (Tables)	3 Months Ended
	Mar. 31, 2024
Receivables [Abstract]
Schedule of Accounts, Notes, Loans and Financing Receivable	Loans consisted of the following at March 31, 2024 and December 31, 2023: March 31, December 31, (Dollars in thousands) Commercial real estate (CRE) $ 87,779 $ 86,566 Multifamily (MF) 7,493 7,582 Commercial and industrial (C+I) 25,394 25,511 Acquisition, development, and land (ADL) 15,205 17,520 1-4 family residential (RES) 270,765 268,943 Home equity line of credit (HELOC) 15,230 14,093 Consumer (CON) 9,985 9,816 Total loans 431,851 430,031 Allowance for credit losses on loans ( 3,420 ) ( 3,390 ) Total loans, net $ 428,431 $ 426,641
Summary of Impact of Adoption	The following table illustrates the impact of the adoption of ASU 2016-13: January 1, 2023 As reported under ASC 326 Pre-ASC 326 Adoption Impact of ASC 326 Adoption (Dollars in thousands) ASSETS Allowance for credit losses on loans: Commercial real estate (CRE) $ 788 $ 942 $ ( 154 ) Multifamily (MF) 55 54 1 Commercial and industrial (C+I) 273 184 89 Acquisition, development, and land (ADL) 120 138 ( 18 ) 1-4 family residential (RES) 1,847 2,048 ( 201 ) Home equity line of credit (HELOC) 88 81 7 Consumer (CON) 114 100 14 Unallocated 1 34 ( 33 ) Allowance for credit losses on loans $ 3,286 $ 3,581 ( 295 ) LIABILITIES Allowance for credit losses on OBS credit exposures $ 308 $ 18 $ 290
Schedule of Allowance For Loans And Leases Receivable Classification	Changes in the ACL for the three months ended March 31, 2024 and 2023, by portfolio segment, are summarized as follows: (Dollars in thousands) CRE MF C+I ADL RES HELOC CON Unallocated Total Balance, December 31, 2023 $ 830 $ 76 $ 236 $ 105 $ 1,601 $ 156 $ 357 $ 29 $ 3,390 (Release) provision for credit losses on loans ( 85 ) ( 1 ) 15 ( 25 ) ( 1 ) 13 15 99 30 Charge-offs — — — — — — — — — Recoveries — — — — — — — — — Balance, March 31, 2024 $ 745 $ 75 $ 251 $ 80 $ 1,600 $ 169 $ 372 $ 128 $ 3,420 (Dollars in thousands) CRE MF C+I ADL RES HELOC CON Unallocated Total Balance, December 31, 2022, Prior to Adoption of ASC 326 $ 942 $ 54 $ 184 $ 138 $ 2,048 $ 81 $ 100 $ 34 $ 3,581 Impact of adopting ASC 326 ( 154 ) 1 89 ( 18 ) ( 201 ) 7 14 ( 33 ) ( 295 ) (Release) provision for credit losses on loans ( 63 ) ( 6 ) 8 ( 24 ) 57 — 4 24 — Recoveries — — — — — — 1 — 1 Balance, March 31, 2023 $ 725 $ 49 $ 281 $ 96 $ 1,904 $ 88 $ 119 $ 25 $ 3,287
Past Due Financing Receivables	The following is an aging analysis of past due loans by portfolio segment as of March 31, 2024 and December 31, 2023 including non-accrual loans without an ACL: March 31, 2024: (Dollars in thousands) 30-59 Days 60-89 Days 90 + Days Total Past Due Current Total Loans Non-Accrual CRE $ — $ — $ — $ — $ 87,779 $ 87,779 $ — MF — — — — 7,493 7,493 — C+I — — — — 25,394 25,394 — ADL — — — — 15,205 15,205 — RES — — 127 127 270,638 270,765 127 HELOC — — 14 14 15,216 15,230 14 CON — — — — 9,985 9,985 — $ — $ — $ 141 $ 141 $ 431,710 $ 431,851 $ 141 December 31, 2023: (Dollars in thousands) 30-59 60-89 90 + Total Current Total Non- CRE $ — $ — $ — $ — $ 86,566 $ 86,566 $ — MF — — — — 7,582 7,582 — C+I — — — — 25,511 25,511 — ADL — — — — 17,520 17,520 — RES — 131 — 131 268,812 268,943 127 HELOC — — 14 14 14,079 14,093 14 CON — — — — 9,816 9,816 — $ — $ 131 $ 14 $ 145 $ 429,886 $ 430,031 $ 141
Schedule of Risk Category of Loans by Portfolio Segment by Vintage Under CECL Methodology	Based upon the most recent analysis performed, the risk category of loans by portfolio segment by vintage, reported under the CECL methodology, was as follows as of March 31, 2024 and December 31, 2023: March 31, 2024: (Dollars in thousands) 2024 2023 2022 2021 2020 Prior Revolving Loans Amortized Cost Basis Revolving Loans Converted to Term Total CRE: Risk rating: Pass $ 1,298 $ 7,949 $ 10,655 $ 11,498 $ 1,595 $ 20,623 $ 33,926 $ — $ 87,544 Special mention — — — — — 235 — — 235 Substandard — — — — — — — — — Total CRE 1,298 7,949 10,655 11,498 1,595 20,858 33,926 — 87,779 MF: Risk rating: Pass — — 142 5,113 1,069 836 333 — 7,493 Special mention — — — — — — — — — Substandard — — — — — — — — — Total MF — — 142 5,113 1,069 836 333 — 7,493 C+I: Risk rating: Pass 1,220 5,604 6,357 3,767 2,739 3,151 2,556 — 25,394 Special mention — — — — — — — — — Substandard — — — — — — — — — Total C+I 1,220 5,604 6,357 3,767 2,739 3,151 2,556 — 25,394 ADL: Risk rating: Pass 97 11,569 593 1,502 — 1,444 — — 15,205 Special mention — — — — — — — — — Substandard — — — — — — — — — Total ADL 97 11,569 593 1,502 — 1,444 — — 15,205 RES: Risk rating: Pass 8,420 14,888 47,659 60,073 50,784 88,814 — — 270,638 Special mention — — — — — — — — — Substandard — — — — — 127 — — 127 Total RES 8,420 14,888 47,659 60,073 50,784 88,941 — — 270,765 HELOC: Risk rating: Pass — — — — — — 15,216 — 15,216 Special mention — — — — — — — — — Substandard — — — — — — 14 — 14 Total HELOC — — — — — — 15,230 — 15,230 CON: Risk rating: Pass 518 2,780 3,013 1,932 1,476 266 — — 9,985 Special mention — — — — — — — — — Substandard — — — — — — — — — Total CON 518 2,780 3,013 1,932 1,476 266 — — 9,985 Total $ 11,553 $ 42,790 $ 68,419 $ 83,885 $ 57,663 $ 115,496 $ 52,045 $ — $ 431,851 December 31, 2023: (Dollars in thousands) 2023 2022 2021 2020 2019 Prior Revolving Loans Amortized Cost Basis Revolving Loans Converted to Term Total CRE: Risk rating: Pass $ 7,552 $ 10,849 $ 11,977 $ 2,268 $ 2,724 $ 18,713 $ 32,244 $ — $ 86,327 Special mention — — — — — 239 — — 239 Substandard — — — — — — — — — Total CRE 7,552 10,849 11,977 2,268 2,724 18,952 32,244 — 86,566 MF: Risk rating: Pass — 145 5,157 1,081 — 852 347 — 7,582 Special mention — — — — — — — — — Substandard — — — — — — — — — Total MF — 145 5,157 1,081 — 852 347 — 7,582 C+I: Risk rating: Pass 5,745 6,580 4,151 2,875 1,537 1,917 2,704 — 25,509 Special mention — — 2 — — — — — 2 Substandard — — — — — — — — — Total C+I 5,745 6,580 4,153 2,875 1,537 1,917 2,704 — 25,511 ADL: Risk rating: Pass 10,511 4,048 1,507 — 1,454 — — — 17,520 Special mention — — — — — — — — — Substandard — — — — — — — — — Total ADL 10,511 4,048 1,507 — 1,454 — — — 17,520 RES: Risk rating: Pass 19,533 43,517 64,226 50,675 20,021 70,844 — — 268,816 Special mention — — — — — — — — — Substandard — — — — — 127 — — 127 Total RES 19,533 43,517 64,226 50,675 20,021 70,971 — — 268,943 HELOC: Risk rating: Pass — — — — — — 14,079 — 14,079 Special mention — — — — — — — — — Substandard — — — — — — 14 — 14 Total HELOC — — — — — — 14,093 — 14,093 CON: Risk rating: Pass 2,902 3,145 1,966 1,512 215 76 — — 9,816 Special mention — — — — — — — — — Substandard — — — — — — — — — Total CON 2,902 3,145 1,966 1,512 215 76 — — 9,816 Total $ 46,243 $ 68,284 $ 88,986 $ 58,411 $ 25,951 $ 92,768 $ 49,388 $ — $ 430,031

Loan Servicing (Tables)

Loan Servicing (Tables)	3 Months Ended
	Mar. 31, 2024
Transfers And Servicing [Abstract]
Schedule of Servicing Assets at Fair Value	The following summarizes activity in mortgage servicing rights for the three months ended March 31, 2024 and 2023: (Dollars in thousands) 2024 2023 Balance, December 31, $ 339 $ 357 Payoffs ( 1 ) ( 3 ) Change in fair value due to change in assumptions ( 9 ) ( 5 ) Balance, March 31, $ 329 $ 349

Deposits (Tables)

Deposits (Tables)	3 Months Ended
	Mar. 31, 2024
Deposits [Abstract]
Deposit Liabilities	Deposits consisted of the following at March 31, 2024 and December 31, 2023: (Dollars in thousands) March 31, 2024 December 31, 2023 NOW and demand deposits $ 160,731 $ 163,316 Money market deposits 86,552 85,364 Savings deposits 64,463 64,823 Time deposits of greater than $250,000 18,222 17,107 Time deposits of $250,000 or less 75,627 74,188 $ 405,595 $ 404,798
Maturities of Time Deposits	At March 31, 2024, the scheduled maturities of time deposits were as follows: (Dollars in thousands) Total 2024 $ 73,036 2025 16,945 2026 2,981 2027 596 2028 224 2029 67 $ 93,849

Borrowings (Tables)

Borrowings (Tables)	3 Months Ended
	Mar. 31, 2024
Debt Disclosure [Abstract]
Schedule of Federal Home Loan Bank, Advances, by Branch of FHLB Bank	A summary of borrowings from the FHLB is as follows: March 31, 2024 Principal Amounts Maturity Dates Interest Rates (Dollars in thousands) $ 26,544 2024 0.00 % to 5.53 % – fixed 520 2025 0.00 % – fixed 50,000 2026 4.38 % to 4.48 % – fixed 718 2028 0.00 % – fixed 200 2030 0.00 % – fixed 430 2031 0.00 % – fixed $ 78,412 December 31, 2023 Principal Amounts Maturity Dates Interest Rates (Dollars in thousands) $ 21,139 2024 0.00 % to 5.53 %– fixed 520 2025 0.00 % – fixed 50,000 2026 4.38 % to 4.48 % – fixed 718 2028 0.00 % – fixed 200 2030 0.00 % – fixed 430 2031 0.00 % – fixed $ 73,007

Financial Instruments with Of_2

Financial Instruments with Off-Balance Sheet Credit Exposures (Tables)	3 Months Ended
	Mar. 31, 2024
Credit Loss [Abstract]
Schedule of Notional Amounts of Financial Instruments with Off-Balance Sheet Credit Risk	Notional amounts of financial instruments with off-balance sheet credit risk are approximately as follows as of March 31, 2024 and December 31, 2023 : 2024 2023 Unadvanced portions of loans $ 58,061 $ 46,175 Commitments to originate loans 24,401 34,074 Standby letters of credit 125 125

Stock Based Compensation (Table

Stock Based Compensation (Tables)	3 Months Ended
	Mar. 31, 2024
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]
Schedule of Company Compensation Expense for the ESOP	At March 31, 2024 and December 31, 2023, total unearned compensation for the ESOP was $ 4.0 million. March 31, 2024 December 31, Shares held by the ESOP include the following: Allocated 55,218 39,864 Committed to be allocated 3,839 15,354 Unallocated 364,658 368,497 Total 423,715 423,715
Summary of Stock Options Outstanding	A summary of stock options outstanding as of March 31, 2024 and changes during the three months ended March 31, 2024 is presented below: March 31, 2024 Number of Shares Weighted Average Exercise Price Weighted Average Remaining Contractual Term (in Years) Aggregate Intrinsic Value Stock options: (In Thousands) Balance at beginning of period 249,144 $ 8.06 9.1 $ — Granted — — — — Vested — — — — Forfeited — — — — Balance at end of period 249,144 $ 8.06 9.1 $ 80 Date of grant 5/25/2023 Options granted 249,144 Exercise price $ 8.06 Vesting period (1) 3 years Expiration date 5/25/2033 Expected volatility 27.8 % Expected term 6.5 years Expected dividend yield 0 % Expected forfeiture rate 0 % Risk free interest rate 3.9 % Fair value per option $ 3.00 (1) Vesting is ratably and the period begins on the date of the grant.
Summary of Non-vested Restricted Shares Outstanding	A summary of non-vested restricted shares outstanding as of March 31, 2024 and December 31, 2023 and changes during the periods then ended is presented below: Three Months Ended March 31, 2024 Number of Shares Weighted Average Grant Value Restricted stock: Non-vested at beginning of period 33,629 $ 11.80 Granted — — Vested — — Forfeited — — Non-vested at end of period 33,629 $ 11.80 Year Ended December 31, 2023 Restricted stock: Non-vested at beginning of year 64,785 $ 11.95 Granted 2,478 7.99 Vested ( 33,634 ) 11.80 Forfeited — — Non-vested at end of year 33,629 $ 11.80

Leases (Tables)

Leases (Tables)	3 Months Ended
	Mar. 31, 2024
Leases [Abstract]
Summary of Right-of-Use Asset and Net Lease Liability	The following table summarizes information related to the Company’s right-of-use asset and net lease liability: March 31, 2024 Operating Leases Balance Sheet Location (Dollars in thousands) Right-of-use asset $ 561 Other Assets Net lease liability 561 Other Liabilities December 31, 2023 Operating Leases Balance Sheet Location (Dollars in thousands) Right-of-use asset $ 587 Other Assets Net lease liability 587 Other Liabilities
Components of Operating Lease Cost and Other Related Information	The components of operating lease cost and other related information are as follows for the three months ended March 31: 2024 2023 (Dollars in thousands) Operating lease cost $ 26 $ 11 Short-term lease cost — — Variable lease cost (cost excluded from lease payments) — — Sublease income — — Total operating lease cost 26 11 Other Information: Cash paid for amounts included in the measurement of lease liabilities - operating cash flows from operating leases $ 26 $ 11 Operating lease - operating cash flows (liability reduction) — — Weighted average lease term remaining (in years) 5.64 4.16 Weighted average discount rate 5.00 % 3.11 %
Schedule of Total Minimum Lease Payments Due In Future Periods For Lease Agreements	The total minimum lease payments due in future periods for lease agreements in effect at March 31, 2024 were as follows: Future Minimum Lease Payments (Dollars in thousands) Remainder of 2024 $ 93 2025 122 2026 120 2027 107 2028 77 Thereafter 122 Total minimum lease payments 641 Less: interest ( 80 ) Total lease liability $ 561

Other Comprehensive (Loss) In_2

Other Comprehensive (Loss) Income (Tables)	3 Months Ended
	Mar. 31, 2024
Disclosure Of Other Comprehensive Income Loss [Abstract]
Schedule of Accumulated Other Comprehensive (Loss) Income	The following table presents a reconciliation of the changes in the components of other comprehensive income or loss for the dates indicated, including the amount of income tax expense or benefit allocated to each component of other comprehensive income or loss: Three Months Ended March 31, Reclassification Adjustments 2024 2023 Affected Line Item in (Dollars in thousands) Net amortization of bond premiums $ 150 $ 239 Interest on debt securities Tax effect ( 40 ) ( 64 ) Income tax expense 110 175 Net (loss) income Gains on termination of interest rate swaps — ( 849 ) Gain on termination of interest rate swaps Tax effect — 230 Income tax expense — ( 619 ) Net (loss) income Total reclassification adjustments $ 110 $ ( 444 )
Summary of Changes in Component of AOCI	The following tables present the changes in each component of AOCI for the periods indicated: (Dollars in thousands) Net Unrealized Gains (1) Net Unrealized Gains (Losses) on Cash Flow (1) AOCI (1) Balance at December 31, 2023 $ ( 5,944 ) $ — $ ( 5,944 ) Other comprehensive loss before ( 1,033 ) — ( 1,033 ) Amounts reclassified from AOCI 110 — 110 Other comprehensive loss ( 923 ) — ( 923 ) Balance at March 31, 2024 $ ( 6,867 ) $ — $ ( 6,867 ) Balance at December 31, 2022 $ ( 10,428 ) $ 701 $ ( 9,727 ) Other comprehensive income (loss) before 1,334 ( 82 ) 1,252 Amounts reclassified from AOCI 175 ( 619 ) ( 444 ) Other comprehensive income (loss) 1,509 ( 701 ) 808 Balance at March 31, 2023 $ ( 8,919 ) $ — $ ( 8,919 ) (1) All amounts are net of tax.

Regulatory Matters (Tables)

Regulatory Matters (Tables)	3 Months Ended
	Mar. 31, 2024
Disclosure Of Regulatory Matters [Abstract]
Schedule of Compliance with Regulatory Capital Requirements under Banking Regulations	Capital levels required to be considered well capitalized are based upon prompt corrective action regulations, as amended to reflect the changes under the Basel III Capital Rules. Minimum Minimum Minimum Capital Actual Requirement Capitalized Fully Phased-In (Dollars in thousands) Amount Ratio Amount Ratio Amount Ratio Amount Ratio March 31, 2024 Total Capital (to risk-weighted assets) $ 54,737 14.88 % $ 29,425 8.00 % $ 36,781 10.00 % $ 38,620 10.50 % Tier 1 Capital (to risk-weighted assets) 50,930 13.85 22,068 6.00 29,425 8.00 31,264 8.50 Tier 1 Capital (to average assets) 50,930 8.92 22,843 4.00 28,554 5.00 22,843 4.00 Common Equity Tier 1 (to risk-weighted assets) 50,930 13.85 16,551 4.50 23,908 6.50 25,747 7.00 Minimum Minimum Minimum Capital Actual Requirement Capitalized Fully Phased-In (Dollars in thousands) Amount Ratio Amount Ratio Amount Ratio Amount Ratio December 31, 2023 Total Capital (to risk-weighted assets) $ 55,701 15.32 % $ 29,090 8.00 % $ 36,363 10.00 % $ 38,181 10.50 % Tier 1 Capital (to risk-weighted assets) 51,878 14.27 21,818 6.00 29,090 8.00 30,908 8.50 Tier 1 Capital (to average assets) 51,878 9.19 22,592 4.00 28,240 5.00 22,592 4.00 Common Equity Tier 1 (to risk-weighted assets) 51,878 14.27 16,363 4.50 23,636 6.50 25,454 7.00

Derivatives and Hedging Activ_2

Derivatives and Hedging Activities (Tables)	3 Months Ended
	Mar. 31, 2024
Derivative Instruments And Hedging Activities Disclosure [Abstract]
Summary of Balance Sheet Related to Cumulative Basis Adjustment for Fair Value Hedges	As of March 31, 2024 and December 31, 2023, the following amounts were recorded on the balance sheet related to cumulative basis adjustment for fair value hedges: Location in Consolidated Balance Sheets Carrying Amount of Hedged Assets/(Liabilities) Cumulative Amount of Fair Value Hedging Adjustment Included in the Carrying Amount of the Hedged Assets/(Liabilities) (Dollars in thousands) March 31, 2024 December 31, 2023 March 31, 2024 December 31, 2023 Securities available-for-sale, at fair value $ 9,977 $ 10,126 $ ( 23 ) $ 126 Total loans 49,942 50,632 ( 58 ) 632 Total $ 59,919 $ 60,758 $ ( 81 ) $ 758
Summary of Fair Values of Derivative Financial Instruments Classification on Consolidated Balance Sheets	The following table presents the fair value of the Company’s derivative financial instruments as well as their classification on the consolidated balance sheet: Derivative Assets Derivative Liabilities Notional Amount Location Fair Value Notional Amount Location Fair Value (Dollars in thousands) March 31, 2024 Derivatives designated as hedging instruments: Interest rate contracts - fair value hedge $ 60,000 Other assets $ 81 $ — Other liabilities $ — Total derivatives designated as hedging instruments $ 81 $ — Derivatives not designated as hedging instruments: Customer loan swaps $ 4,732 Other assets $ 22 $ 4,732 Other liabilities $ 22 Total derivatives not designated as hedging instruments $ 22 $ 22 December 31, 2023 Derivatives designated as hedging instruments: Interest rate contracts - cash flow hedge $ 60,000 Other assets $ — $ — Other liabilities $ 758 Total derivatives designated as hedging instruments $ — $ 758 Derivatives not designated as hedging instruments: Customer loan swaps $ 4,766 Other assets $ 90 $ 4,766 Other liabilities $ 90 Total derivatives not designated as hedging instruments $ 90 $ 90
Summary of Derivative Positions Offset in Consolidated Balance Sheets	The following tables present the information about derivative positions that are eligible for offset in the consolidated balance sheets as of March 31, 2024 and December 31, 2023: Gross Amounts Not Offset (Dollars in thousands) Gross Amounts Recognized Gross Amounts Offset Net Amounts Recognized Financial Instruments Pledged (Received) Cash Collateral Pledged (Received) (1) Net Amount March 31, 2024 Derivative Assets: Interest rate contracts(2) $ 81 $ — $ 81 $ — $ 81 $ — Customer loan swaps - dealer bank(3) 22 — 22 — — 22 Total $ 103 $ — $ 103 $ — $ 81 $ 22 Derivative Liabilities: Interest rate contracts(2) $ — $ — $ — $ — $ — $ — Customer loan swaps - commercial customer(3) 22 — 22 — 22 — Total $ 22 $ — $ 22 $ — $ 22 $ — December 31, 2023 Derivative Assets: Interest rate contracts(2) $ — $ — $ — $ — $ — $ — Customer loan swaps - dealer bank(3) 90 — 90 — 90 — Total $ 90 $ — $ 90 $ — $ 90 $ — Derivative Liabilities: Interest rate contracts(2) $ 758 $ — $ 758 $ — $ 758 $ — Customer loan swaps - commercial customer(3) 90 — 90 — — 90 Total $ 848 $ — $ 848 $ — $ 758 $ 90 (1) The amount presented was the lesser of the amount pledged (received) or the net amount presented in the consolidated balance sheets. (2) Interest rate swap contracts were completed with the same dealer bank. The Company maintains a master netting arrangement with the counterparty and settles collateral on a net basis for all contracts. (3) The Company manages its net exposure on its commercial customer loan swaps by obtaining collateral as part of the normal loan policy and underwriting practices. The Company does not post collateral to its commercial customers as part of its contract.

Fair Values of Assets and Lia_2

Fair Values of Assets and Liabilities (Tables)	3 Months Ended
	Mar. 31, 2024
Fair Value Disclosures [Abstract]
Summary of Changes in Level 3 Assets and Liabilities Measured at Fair Value on a Recurring Basis	The following table summarizes financial assets and liabilities measured at fair value on a recurring basis as of March 31, 2024 and December 31, 2023, segregated by the level of the valuation inputs within the fair value hierarchy utilized to measure fair value: Total Level 1 Level 2 Level 3 (Dollars in thousands) March 31, 2024 Securities available-for-sale: U.S. Government-sponsored enterprises obligations $ 1,380 $ — $ 1,380 $ — U.S Government agency small business administration 14,782 — 14,782 — Collateralized mortgage obligations issued by 5,474 — 5,474 — Residential mortgage-backed-securities 39,323 — 39,323 — Municipal bonds 53,494 — 53,494 — Corporate debt 493 — 493 — Corporate subordinated debt 9,253 — 9,253 — Other assets: Mortgage servicing rights 329 — — 329 Derivatives 103 — 103 — Other Liabilities: Derivatives 22 — 22 — Total Level 1 Level 2 Level 3 (Dollars in thousands) December 31, 2023 Securities available-for-sale: U.S. Government-sponsored enterprises obligations $ 1,398 $ — $ 1,398 $ — U.S Government agency small business administration 15,583 — 15,583 — Collateralized mortgage obligations issued by 2,474 — 2,474 — Residential mortgage-backed securities 38,221 — 38,221 — Municipal bonds 54,692 — 54,692 — Corporate debt 492 — 492 — Corporate subordinated debt 8,994 — 8,994 — Other assets: Mortgage servicing rights $ 339 — — 339 Derivatives 90 — 90 — Other liabilities: Derivatives 848 — 848 —
Summary of Financial Assets and Liabilities Measured at Fair Value on a Recurring Basis	For the three months ended March 31, 2024 and 2023, the changes in Level 3 assets and liabilities measured at fair value on a recurring basis were as follows: (Dollars in thousands) Mortgage Servicing Rights (1) Balance as of January 1, 2024 $ 339 Included in net (loss) income ( 10 ) Balance as of March 31, 2024 $ 329 Total unrealized net gains (losses) $ — Balance as of January 1, 2023 $ 357 Included in net (loss) income ( 8 ) Balance as of March 31, 2023 $ 349 Total unrealized net gains (losses) $ — (1) Realized and unrealized gains and losses related to mortgage servicing rights are reported as a component of loan servicing fee income in the Company’s consolidated statements of (loss) income.
Summary of Significant Unobservable Inputs used in Level 3 Assets Measured at Fair Value on Recurring Basis	For Level 3 assets measured at fair value on a recurring basis as of March 31, 2024 and December 31, 2023, the significant unobservable inputs used in the fair value measurements were as follows: March 31, 2024 (Dollars in thousands) Valuation Technique Description Range Weighted Average (1) Fair Value Mortgage Servicing Rights Discounted Cash Flow Prepayment Rate 5.01 % - 17.31 % 6.67 % $ 329 Discount Rate 9.75 % 9.75 % Delinquency Rate 2.16 % - 2.77 % 2.27 % Default Rate 0.14 % - 0.18 % 0.15 % December 31, 2023 (Dollars in thousands) Valuation Technique Description Range Weighted Average (1) Fair Value Mortgage Servicing Rights Discounted Cash Flow Prepayment Rate 5.35 % - 20.53 % 6.85 % $ 339 Discount Rate 9.38 % 9.38 % Delinquency Rate 2.08 % - 2.60 % 2.17 % Default Rate 0.12 % - 0.14 % 0.14 % (1) Unobservable inputs for mortgage servicing rights were weighted by loan amount.
Fair Value Measurements, Recurring and Nonrecurring	The estimated fair values, and related carrying or notional amounts, of the Company’s financial instruments at March 31, 2024 and December 31, 2023 are as follows: (Dollars in thousands) Carrying Fair Level 1 Level 2 Level 3 March 31, 2024 Financial Assets: Cash and due from banks $ 6,713 $ 6,713 $ 6,713 $ — $ — Federal Home Loan Bank stock 3,448 3,448 — 3,448 — Bank-owned life insurance 4,683 4,683 — 4,683 — Loans, net 428,431 381,372 — — 381,372 Accrued interest receivable 2,368 2,368 2,368 — — Financial Liabilities: Deposits $ 405,595 $ 404,371 $ 311,745 $ 92,626 $ — Advances from Federal Home Loan Bank 78,412 78,162 — 78,162 — Advances from Federal Reserve Bank 20,000 19,966 — 19,966 — Mortgagors’ tax escrow 2,079 2,079 — 2,079 — Accrued interest payable 644 644 644 — — December 31, 2023 Financial Assets: Cash and due from banks $ 6,069 $ 6,069 $ 6,069 $ — $ — Federal Home Loan Bank stock 2,986 2,986 — 2,986 — Bank-owned life insurance 4,663 4,663 — 4,663 — Loans, net 426,641 376,772 — — 376,772 Accrued interest receivable 2,294 2,294 2,294 — — Financial Liabilities: Deposits $ 404,798 $ 403,489 $ 313,503 $ 89,986 $ — Advances from Federal Home Loan Bank 73,007 73,162 — 73,162 — Advances from Federal Reserve Bank 20,000 20,020 — 20,020 — Mortgagors’ tax escrow 640 640 — 640 — Accrued interest payable 380 380 380 — —

Summary of Significant Accoun_3

Summary of Significant Accounting Policies - Additional Information (Detail)			3 Months Ended
	Jan. 19, 2023 $ / shares shares	Aug. 17, 2021 USD ($)	Mar. 31, 2024 USD ($) Segment Service $ / shares shares	Mar. 31, 2023 USD ($)	Dec. 31, 2023 USD ($) $ / shares shares
Common stock, price per share | $ / shares			$ 0.01		$ 0.01
Common stock issued | shares			5,192,612		5,192,612
Number of core services | Service			4
Number of reportable segment | Segment			1
Accounts purchase price | $		$ 324,000
Deposit assets, amortization expense from expirations | $			$ 8,000	$ 9,000
Emerging growth of company status			(i) the last day of the fiscal year of the Company during which it had total annual gross revenues of $1.235 billion (as adjusted for inflation) or more; (ii) the last day of the fiscal year of the Company following the fifth anniversary of the effective date of the Company’s initial public offering; (which will be December 31, 2024 for the Company) (iii) the date on which the Company has, during the previous three-year period, issued more than $1.0 billion in non-convertible debt; or (iv) the date on which the Company is deemed to be a “large accelerated filer” under Securities and Exchange Commission regulations (generally, at least $700 million of voting and non-voting equity held by non-affiliates).
Customer List Intangible [Member]
Intangible balances | $			$ 239,000		$ 247,000
First Seacoast Bancorp, Inc [Member]
Common stock shares sold | shares	2,805,000
Common stock, price per share | $ / shares	$ 10
Common stock coversion ratio	0.8358
First Seacoast Bancorp, Inc [Member] | First Seacoast Bank Employee Stock Ownership Plan [Member]
Common stock issued | shares	224,400

Securities Available-for-Sale -

Securities Available-for-Sale - Schedule of amortized cost and fair value of securities available-for-sale (Detail) - USD ($) $ in Thousands	Mar. 31, 2024		Dec. 31, 2023
Amortized Cost	$ 133,597		$ 129,988
Gross Unrealized Gains	1,421		1,779
Gross Unrealized Losses	(10,819)		(9,913)
Fair Value	124,199		121,854
U.S. Government-sponsored enterprises obligations [Member]
Amortized Cost	1,662		1,668
Gross Unrealized Losses	(282)		(270)
Fair Value	1,380		1,398
U.S. Government agency small business administration pools guaranteed by SBA [Member]
Amortized Cost	15,659	[1]	16,410
Gross Unrealized Gains	18		36
Gross Unrealized Losses	(895)		(863)
Fair Value	14,782	[1]	15,583
Collateralized mortgage obligations issued by the FHLMC, FNMA and GNMA [Member]
Amortized Cost	6,012		2,958
Gross Unrealized Losses	(538)		(484)
Fair Value	5,474		2,474
Residential mortgage backed securities [Member]
Amortized Cost	42,743	[1]	41,186
Gross Unrealized Gains	534		653
Gross Unrealized Losses	(3,954)		(3,618)
Fair Value	39,323	[1]	38,221
Municipal bonds [Member]
Amortized Cost	56,926		57,192
Gross Unrealized Gains	787		1,087
Gross Unrealized Losses	(4,219)		(3,587)
Fair Value	53,494		54,692
Corporate debt [Member]
Amortized Cost	500		500
Gross Unrealized Losses	(7)		(8)
Fair Value	493		492
Corporate subordinated debt [Member]
Amortized Cost	10,095		10,074
Gross Unrealized Gains	82		3
Gross Unrealized Losses	(924)		(1,083)
Fair Value	$ 9,253		$ 8,994
[1] Actual maturities for these debt securities are dependent upon the interest rate environment and prepayments on the underlying loans.

Securities Available-for-Sale_2

Securities Available-for-Sale - Schedule of amortized cost and fair values of securities available-for-sale by contractual maturity (Detail) - USD ($) $ in Thousands	Mar. 31, 2024		Dec. 31, 2023
Due in one year or less	$ 1,784
Due after one year through five years, Amortized Cost	500
Due after five years through ten years, Amortized Cost	10,917
Due after ten years, Amortized Cost	55,982
Total U.S. Government-sponsored enterprises obligations, municipal bonds, corporate debt and corporate subordinated debt	69,183
Mortgage-backed securities, Amortized Cost	133,597		$ 129,988
Due in one year or less, Fair value	1,789
Due after one year through five years, Fair Value	493
Due after five years through ten years, Fair Value	9,734
Due after ten years, Fair Value	52,604
Total U.S. Government-sponsored enterprises obligations, municipal bonds and corporate subordinated debt	64,620
Mortgage-backed securities, Fair Value	124,199		121,854
U.S. Government agency small business administration pools guaranteed by SBA [Member]
Mortgage-backed securities, Amortized Cost	15,659	[1]	16,410
Mortgage-backed securities, Fair Value	14,782	[1]	15,583
Collateralized mortgage obligations issued by the FHLMC, FNMA and GNMA [Member]
Mortgage-backed securities, Amortized Cost	6,012		2,958
Mortgage-backed securities, Fair Value	5,474		2,474
Residential mortgage backed securities [Member]
Mortgage-backed securities, Amortized Cost	42,743	[1]	41,186
Mortgage-backed securities, Fair Value	$ 39,323	[1]	$ 38,221
[1] Actual maturities for these debt securities are dependent upon the interest rate environment and prepayments on the underlying loans.

Securities Available-for-Sale_3

Securities Available-for-Sale - Summary of gross unrealized losses and fair value for those investments with unrealized losses (Detail) $ in Thousands	Mar. 31, 2024 USD ($) Number	Dec. 31, 2023 USD ($) Number
Less than 12 Months, Number of Securities | Number	21	18
Less than 12 Months, Fair Value	$ 19,709	$ 19,259
Less than 12 Months, Unrealized Losses	$ (249)	$ (220)
More than 12 Months, Number of Securities | Number	90	89
More than 12 Months, Fair Value	$ 57,489	$ 58,368
More than 12 Months, Unrealized Losses	(10,570)	(9,693)
Total, Fair Value	77,198	77,627
Total, Unrealized Losses	$ (10,819)	$ (9,913)
U.S. Government-sponsored enterprises obligations [Member]
More than 12 Months, Number of Securities | Number	3	3
More than 12 Months, Fair Value	$ 1,380	$ 1,398
More than 12 Months, Unrealized Losses	(282)	(270)
Total, Fair Value	1,380	1,398
Total, Unrealized Losses	$ (282)	$ (270)
U.S. Government agency small business administration pools guaranteed by SBA [Member]
Less than 12 Months, Number of Securities | Number	8	8
Less than 12 Months, Fair Value	$ 7,831	$ 8,432
Less than 12 Months, Unrealized Losses	$ (65)	$ (75)
More than 12 Months, Number of Securities | Number	5	5
More than 12 Months, Fair Value	$ 3,787	$ 3,899
More than 12 Months, Unrealized Losses	(830)	(788)
Total, Fair Value	11,618	12,331
Total, Unrealized Losses	$ (895)	$ (863)
Collateralized mortgage obligations issued by the FHLMC, FNMA and GNMA [Member]
Less than 12 Months, Number of Securities | Number	2
Less than 12 Months, Fair Value	$ 3,069
Less than 12 Months, Unrealized Losses	$ (26)
More than 12 Months, Number of Securities | Number	4	4
More than 12 Months, Fair Value	$ 2,405	$ 2,474
More than 12 Months, Unrealized Losses	(512)	(484)
Total, Fair Value	5,474	2,474
Total, Unrealized Losses	$ (538)	$ (484)
Residential mortgage backed securities [Member]
Less than 12 Months, Number of Securities | Number	6	5
Less than 12 Months, Fair Value	$ 5,592	$ 4,806
Less than 12 Months, Unrealized Losses	$ (89)	$ (53)
More than 12 Months, Number of Securities | Number	23	23
More than 12 Months, Fair Value	$ 14,788	$ 15,347
More than 12 Months, Unrealized Losses	(3,865)	(3,565)
Total, Fair Value	20,380	20,153
Total, Unrealized Losses	$ (3,954)	$ (3,618)
Municipal bonds [Member]
Less than 12 Months, Number of Securities | Number	5	1
Less than 12 Months, Fair Value	$ 3,217	$ 1,941
Less than 12 Months, Unrealized Losses	$ (69)	$ (10)
More than 12 Months, Number of Securities | Number	49	49
More than 12 Months, Fair Value	$ 30,035	$ 30,729
More than 12 Months, Unrealized Losses	(4,150)	(3,577)
Total, Fair Value	33,252	32,670
Total, Unrealized Losses	$ (4,219)	$ (3,587)
Corporate debt [Member]
More than 12 Months, Number of Securities | Number	1	1
More than 12 Months, Fair Value	$ 493	$ 492
More than 12 Months, Unrealized Losses	(7)	(8)
Total, Fair Value	493	492
Total, Unrealized Losses	$ (7)	$ (8)
Corporate subordinated debt [Member]
Less than 12 Months, Number of Securities | Number		4
Less than 12 Months, Fair Value		$ 4,080
Less than 12 Months, Unrealized Losses		$ (82)
More than 12 Months, Number of Securities | Number	5	4
More than 12 Months, Fair Value	$ 4,601	$ 4,029
More than 12 Months, Unrealized Losses	(924)	(1,001)
Total, Fair Value	4,601	8,109
Total, Unrealized Losses	$ (924)	$ (1,083)

Securities Available-for-Sale_4

Securities Available-for-Sale - Summary of sales proceeds, principal payments received and gross realized gains and losses on available for sale securities (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Available For Sale Securities [Abstract]
Proceeds from sales, maturities and principal payments received on securities available-for-sale	$ 1,258	$ 1,038

Securities Available-for-Sale_5

Securities Available-for-Sale - Additional Information (Detail) $ in Millions	3 Months Ended	12 Months Ended
	Mar. 31, 2024 USD ($) Security	Dec. 31, 2023 USD ($) Security
Available For Sale Securities [Abstract]
Number of holdings of securities aggregate carrying value exceeded ten percentage of stockholders' equity	0	0
Securities available for sale	111
Available-for-sale were pledged as collateral | $	$ 72.7	$ 74.1

Loans and Allowance for Credi_3

Loans and Allowance for Credit Losses on Loans - Additional Information (Detail) - USD ($)	3 Months Ended		12 Months Ended
	Mar. 31, 2024	Mar. 31, 2023	Dec. 31, 2023
Loans outstanding	$ 5,000,000		$ 5,200,000
Interest income recognized on non-accrual loans	0	$ 0
Loans past due over 90 days still accruing interest	0
Non-Accrual Loans	$ 141,000		141,000
ASU 2016-13
Change in accounting principle, accounting standards update, adopted	true
Change in accounting principle, accounting standards update, adoption date	Jan. 01, 2023
Residential Real Estate [Member]
Loans collateralized by real estate	$ 0		0
Real estate appraial value	216,000		216,000
RES [Member]
Non-Accrual Loans	127,000		127,000
RES and HELOC [Member]
Non-Accrual Loans	$ 141,000		$ 141,000

Loans and Allowance for Credi_4

Loans and Allowance for Credit Losses on Loans - Schedule of Accounts, Notes, Loans and Financing Receivable (Detail) - USD ($) $ in Thousands	Mar. 31, 2024	Dec. 31, 2023	Mar. 31, 2023	Dec. 31, 2022
Total loans	$ 431,851	$ 430,031
Allowance for credit losses on loans	(3,420)	(3,390)	$ (3,287)	$ (3,581)
Net loans	428,431	426,641
CRE [Member]
Total loans	87,779	86,566
Allowance for credit losses on loans	(745)	(830)	(725)	(942)
MF [Member]
Total loans	7,493	7,582
Allowance for credit losses on loans	(75)	(76)	(49)	(54)
C+I [Member]
Total loans	25,394	25,511
Allowance for credit losses on loans	(251)	(236)	(281)	(184)
ADL [Member]
Total loans	15,205	17,520
Allowance for credit losses on loans	(80)	(105)	(96)	(138)
RES [Member]
Total loans	270,765	268,943
Allowance for credit losses on loans	(1,600)	(1,601)	(1,904)	(2,048)
HELOC [Member]
Total loans	15,230	14,093
Allowance for credit losses on loans	(169)	(156)	(88)	(81)
CON [Member]
Total loans	9,985	9,816
Allowance for credit losses on loans	$ (372)	$ (357)	$ (119)	$ (100)

Loans and Allowance for Credi_5

Loans and Allowance for Credit Losses on Loans - Summary of Impact of Adoption (Detail) - USD ($) $ in Thousands	Mar. 31, 2024	Dec. 31, 2023	Mar. 31, 2023	Jan. 01, 2023	Dec. 31, 2022
Assets [Abstract]
Allowance for credit losses on loans	$ 3,420	$ 3,390	$ 3,287		$ 3,581
Liabilities [Abstract]
Allowance for credit losses on OBS credit exposures	341,000	391,000
ASU 2016-13 | As reported under ASC 326 [Member]
Assets [Abstract]
Allowance for credit losses on loans				$ 3,286
Liabilities [Abstract]
Allowance for credit losses on OBS credit exposures				308
ASU 2016-13 | Pre-ASC 326 Adoption [Member]
Assets [Abstract]
Allowance for credit losses on loans				3,581
Liabilities [Abstract]
Allowance for credit losses on OBS credit exposures				18
ASU 2016-13 | Impact of adopting ASC 326 [Member]
Assets [Abstract]
Allowance for credit losses on loans			(295)	(295)
Liabilities [Abstract]
Allowance for credit losses on OBS credit exposures				290
CRE [Member]
Assets [Abstract]
Allowance for credit losses on loans	745	830	725		942
CRE [Member] | ASU 2016-13 | As reported under ASC 326 [Member]
Assets [Abstract]
Allowance for credit losses on loans				788
CRE [Member] | ASU 2016-13 | Pre-ASC 326 Adoption [Member]
Assets [Abstract]
Allowance for credit losses on loans				942
CRE [Member] | ASU 2016-13 | Impact of adopting ASC 326 [Member]
Assets [Abstract]
Allowance for credit losses on loans			(154)	(154)
MF [Member]
Assets [Abstract]
Allowance for credit losses on loans	75	76	49		54
MF [Member] | ASU 2016-13 | As reported under ASC 326 [Member]
Assets [Abstract]
Allowance for credit losses on loans				55
MF [Member] | ASU 2016-13 | Pre-ASC 326 Adoption [Member]
Assets [Abstract]
Allowance for credit losses on loans				54
MF [Member] | ASU 2016-13 | Impact of adopting ASC 326 [Member]
Assets [Abstract]
Allowance for credit losses on loans			1	1
C+I [Member]
Assets [Abstract]
Allowance for credit losses on loans	251	236	281		184
C+I [Member] | ASU 2016-13 | As reported under ASC 326 [Member]
Assets [Abstract]
Allowance for credit losses on loans				273
C+I [Member] | ASU 2016-13 | Pre-ASC 326 Adoption [Member]
Assets [Abstract]
Allowance for credit losses on loans				184
C+I [Member] | ASU 2016-13 | Impact of adopting ASC 326 [Member]
Assets [Abstract]
Allowance for credit losses on loans			89	89
ADL [Member]
Assets [Abstract]
Allowance for credit losses on loans	80	105	96		138
ADL [Member] | ASU 2016-13 | As reported under ASC 326 [Member]
Assets [Abstract]
Allowance for credit losses on loans				120
ADL [Member] | ASU 2016-13 | Pre-ASC 326 Adoption [Member]
Assets [Abstract]
Allowance for credit losses on loans				138
ADL [Member] | ASU 2016-13 | Impact of adopting ASC 326 [Member]
Assets [Abstract]
Allowance for credit losses on loans			(18)	(18)
RES [Member]
Assets [Abstract]
Allowance for credit losses on loans	1,600	1,601	1,904		2,048
RES [Member] | ASU 2016-13 | As reported under ASC 326 [Member]
Assets [Abstract]
Allowance for credit losses on loans				1,847
RES [Member] | ASU 2016-13 | Pre-ASC 326 Adoption [Member]
Assets [Abstract]
Allowance for credit losses on loans				2,048
RES [Member] | ASU 2016-13 | Impact of adopting ASC 326 [Member]
Assets [Abstract]
Allowance for credit losses on loans			(201)	(201)
HELOC [Member]
Assets [Abstract]
Allowance for credit losses on loans	169	156	88		81
HELOC [Member] | ASU 2016-13 | As reported under ASC 326 [Member]
Assets [Abstract]
Allowance for credit losses on loans				88
HELOC [Member] | ASU 2016-13 | Pre-ASC 326 Adoption [Member]
Assets [Abstract]
Allowance for credit losses on loans				81
HELOC [Member] | ASU 2016-13 | Impact of adopting ASC 326 [Member]
Assets [Abstract]
Allowance for credit losses on loans			7	7
CON [Member]
Assets [Abstract]
Allowance for credit losses on loans	372	357	119		100
CON [Member] | ASU 2016-13 | As reported under ASC 326 [Member]
Assets [Abstract]
Allowance for credit losses on loans				114
CON [Member] | ASU 2016-13 | Pre-ASC 326 Adoption [Member]
Assets [Abstract]
Allowance for credit losses on loans				100
CON [Member] | ASU 2016-13 | Impact of adopting ASC 326 [Member]
Assets [Abstract]
Allowance for credit losses on loans			14	14
Unallocated [Member]
Assets [Abstract]
Allowance for credit losses on loans	$ 128	$ 29	25		$ 34
Unallocated [Member] | ASU 2016-13 | As reported under ASC 326 [Member]
Assets [Abstract]
Allowance for credit losses on loans				1
Unallocated [Member] | ASU 2016-13 | Pre-ASC 326 Adoption [Member]
Assets [Abstract]
Allowance for credit losses on loans				34
Unallocated [Member] | ASU 2016-13 | Impact of adopting ASC 326 [Member]
Assets [Abstract]
Allowance for credit losses on loans			$ (33)	$ (33)

Loans and Allowance for Credi_6

Loans and Allowance for Credit Losses on Loans - Transactions In The Allowance For Loan Losses ("ALL") (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023	Dec. 31, 2023	Jan. 01, 2023
Balance	$ 3,390	$ 3,581
Allowance for credit losses on OBS credit exposures	341,000		$ 391,000
(Release) provision for credit losses	30
Recoveries		1
Balance	3,420	3,287
ASU 2016-13 [Member] | Impact of adopting ASC 326 [Member]
Allowance for credit losses on OBS credit exposures				$ 290
Balance		(295)
ASU 2016-13 [Member] | As reported under ASC 326 [Member]
Allowance for credit losses on OBS credit exposures				308
ASU 2016-13 [Member] | Pre-ASC 326 Adoption [Member]
Allowance for credit losses on OBS credit exposures				$ 18
CRE [Member]
Balance	830	942
(Release) provision for credit losses	(85)	(63)
Balance	745	725
CRE [Member] | ASU 2016-13 [Member] | Impact of adopting ASC 326 [Member]
Balance		(154)
MF [Member]
Balance	76	54
(Release) provision for credit losses	(1)	(6)
Balance	75	49
MF [Member] | ASU 2016-13 [Member] | Impact of adopting ASC 326 [Member]
Balance		1
C+I [Member]
Balance	236	184
(Release) provision for credit losses	15	8
Balance	251	281
C+I [Member] | ASU 2016-13 [Member] | Impact of adopting ASC 326 [Member]
Balance		89
ADL [Member]
Balance	105	138
(Release) provision for credit losses	(25)	(24)
Balance	80	96
ADL [Member] | ASU 2016-13 [Member] | Impact of adopting ASC 326 [Member]
Balance		(18)
RES [Member]
Balance	1,601	2,048
(Release) provision for credit losses	(1)	57
Balance	1,600	1,904
RES [Member] | ASU 2016-13 [Member] | Impact of adopting ASC 326 [Member]
Balance		(201)
HELOC [Member]
Balance	156	81
(Release) provision for credit losses	13
Balance	169	88
HELOC [Member] | ASU 2016-13 [Member] | Impact of adopting ASC 326 [Member]
Balance		7
CON [Member]
Balance	357	100
(Release) provision for credit losses	15	4
Recoveries		1
Balance	372	119
CON [Member] | ASU 2016-13 [Member] | Impact of adopting ASC 326 [Member]
Balance		14
Unallocated [Member]
Balance	29	34
(Release) provision for credit losses	99	24
Balance	$ 128	25
Unallocated [Member] | ASU 2016-13 [Member] | Impact of adopting ASC 326 [Member]
Balance		$ (33)

Loans and Allowance for Credi_7

Loans and Allowance for Credit Losses on Loans - Analysis Of Past Due Loans By Portfolio Segment Including Non-Accrual Loans Without ACL (Detail) - USD ($) $ in Thousands	Mar. 31, 2024	Dec. 31, 2023
Total Past Due	$ 431,851	$ 430,031
Total	431,851	430,031
Non-Accrual Loans	141	141
60-89 Days Past Due [Member]
Total Past Due		131
Greater than 90 Days [Member]
Total Past Due	141	14
Total Past Due
Total Past Due	141	145
Current
Total Past Due	431,710	429,886
Total	431,851
CRE [Member]
Total Past Due	87,779	86,566
Total	87,779	86,566
CRE [Member] | Current
Total Past Due	87,779	86,566
Total	87,779
MF [Member]
Total Past Due	7,493	7,582
Total	7,493	7,582
MF [Member] | Current
Total Past Due	7,493	7,582
Total	7,493
C+I [Member]
Total Past Due	25,394	25,511
Total	25,394	25,511
C+I [Member] | Current
Total Past Due	25,394	25,511
Total	25,394
ADL [Member]
Total Past Due	15,205	17,520
Total	15,205	17,520
ADL [Member] | Current
Total Past Due	15,205	17,520
Total	15,205
RES [Member]
Total Past Due	270,765	268,943
Total	270,765	268,943
Non-Accrual Loans	127	127
RES [Member] | 60-89 Days Past Due [Member]
Total Past Due		131
RES [Member] | Greater than 90 Days [Member]
Total Past Due	127
RES [Member] | Total Past Due
Total Past Due	127	131
RES [Member] | Current
Total Past Due	270,638	268,812
Total	270,765
HELOC [Member]
Total Past Due	15,230	14,093
Total	15,230	14,093
Non-Accrual Loans	14	14
HELOC [Member] | Greater than 90 Days [Member]
Total Past Due	14
HELOC [Member] | Total Past Due
Total Past Due	14	14
HELOC [Member] | Current
Total Past Due	15,216	14,079
Total	15,230
CON [Member]
Total Past Due	9,985	9,816
Total	9,985	9,816
CON [Member] | Total Past Due
Total Past Due		0
CON [Member] | Current
Total Past Due	9,985	$ 9,816
Total	$ 9,985

Loans and Allowance for Credi_8

Loans and Allowance for Credit Losses on Loans - Schedule Of Risk Category Of Loans By Portfolio Segment By Vintage Under CECL Methodology (Details) - USD ($) $ in Thousands	Mar. 31, 2024	Dec. 31, 2023
Financing Receivable, Credit Quality Indicator [Line Items]
2024 / 2023	$ 11,553	$ 46,243
2023 / 2022	42,790	68,284
2022 / 2021	68,419	88,986
2021 / 2020	83,885	58,411
2020 / 2019	57,663	25,951
Prior	115,496	92,768
Revolving Loans Amortized Cost Basis	52,045	49,388
Total loans	431,851	430,031
CRE [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
2024 / 2023	1,298	7,552
2023 / 2022	7,949	10,849
2022 / 2021	10,655	11,977
2021 / 2020	11,498	2,268
2020 / 2019	1,595	2,724
Prior	20,858	18,952
Revolving Loans Amortized Cost Basis	33,926	32,244
Total loans	87,779	86,566
MF [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
2023 / 2022		145
2022 / 2021	142	5,157
2021 / 2020	5,113	1,081
2020 / 2019	1,069
Prior	836	852
Revolving Loans Amortized Cost Basis	333	347
Total loans	7,493	7,582
C+I [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
2024 / 2023	1,220	5,745
2023 / 2022	5,604	6,580
2022 / 2021	6,357	4,153
2021 / 2020	3,767	2,875
2020 / 2019	2,739	1,537
Prior	3,151	1,917
Revolving Loans Amortized Cost Basis	2,556	2,704
Total loans	25,394	25,511
ADL [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
2024 / 2023	97	10,511
2023 / 2022	11,569	4,048
2022 / 2021	593	1,507
2021 / 2020	1,502
2020 / 2019		1,454
Prior	1,444
Total loans	15,205	17,520
RES [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
2024 / 2023	8,420	19,533
2023 / 2022	14,888	43,517
2022 / 2021	47,659	64,226
2021 / 2020	60,073	50,675
2020 / 2019	50,784	20,021
Prior	88,941	70,971
Total loans	270,765	268,943
HELOC [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Revolving Loans Amortized Cost Basis	15,230	14,093
Total loans	15,230	14,093
CON [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
2024 / 2023	518	2,902
2023 / 2022	2,780	3,145
2022 / 2021	3,013	1,966
2021 / 2020	1,932	1,512
2020 / 2019	1,476	215
Prior	266	76
Total loans	9,985	9,816
Pass [Member] | CRE [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
2024 / 2023	1,298	7,552
2023 / 2022	7,949	10,849
2022 / 2021	10,655	11,977
2021 / 2020	11,498	2,268
2020 / 2019	1,595	2,724
Prior	20,623	18,713
Revolving Loans Amortized Cost Basis	33,926	32,244
Total loans	87,544	86,327
Pass [Member] | MF [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
2023 / 2022		145
2022 / 2021	142	5,157
2021 / 2020	5,113	1,081
2020 / 2019	1,069
Prior	836	852
Revolving Loans Amortized Cost Basis	333	347
Total loans	7,493	7,582
Pass [Member] | C+I [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
2024 / 2023	1,220	5,745
2023 / 2022	5,604	6,580
2022 / 2021	6,357	4,151
2021 / 2020	3,767	2,875
2020 / 2019	2,739	1,537
Prior	3,151	1,917
Revolving Loans Amortized Cost Basis	2,556	2,704
Total loans	25,394	25,509
Pass [Member] | ADL [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
2024 / 2023	97	10,511
2023 / 2022	11,569	4,048
2022 / 2021	593	1,507
2021 / 2020	1,502
2020 / 2019		1,454
Prior	1,444
Total loans	15,205	17,520
Pass [Member] | RES [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
2024 / 2023	8,420	19,533
2023 / 2022	14,888	43,517
2022 / 2021	47,659	64,226
2021 / 2020	60,073	50,675
2020 / 2019	50,784	20,021
Prior	88,814	70,844
Total loans	270,638	268,816
Pass [Member] | HELOC [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Revolving Loans Amortized Cost Basis	15,216	14,079
Total loans	15,216	14,079
Pass [Member] | CON [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
2024 / 2023	518	2,902
2023 / 2022	2,780	3,145
2022 / 2021	3,013	1,966
2021 / 2020	1,932	1,512
2020 / 2019	1,476	215
Prior	266	76
Total loans	9,985	9,816
Special Mention [Member] | CRE [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Prior	235	239
Total loans	235	239
Special Mention [Member] | C+I [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
2022 / 2021		2
Total loans		2
Substandard [Member] | RES [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Prior	127	127
Total loans	127	127
Substandard [Member] | HELOC [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Revolving Loans Amortized Cost Basis	14	14
Total loans	$ 14	$ 14

Loan Servicing - Additional Inf

Loan Servicing - Additional Information (Detail) - USD ($)	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023	Dec. 31, 2023
Transfers And Servicing [Abstract]
Transferred financial assets principal amount outstanding	$ 33,200,000		$ 33,900,000
Loan servicing income	$ 11,000	$ 15,000

Loan Servicing - Summary Of Act

Loan Servicing - Summary Of Activity In Mortgage Servicing Rights (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Transfers And Servicing [Abstract]
Beginning Balance	$ 339	$ 357
Payoffs	(1)	(3)
Change in fair value due to change in assumptions	(9)	(5)
Ending Balance	$ 329	$ 349

Deposits - Deposit Liabilities

Deposits - Deposit Liabilities (Detail) - USD ($) $ in Thousands	Mar. 31, 2024	Dec. 31, 2023
Deposits [Abstract]
NOW and demand deposits	$ 160,731	$ 163,316
Money market deposits	86,552	85,364
Savings deposits	64,463	64,823
Time deposits of greater than $250,000	18,222	17,107
Time deposits of $250,000 or less	75,627	74,188
Total deposits	$ 405,595	$ 404,798

Deposits - Time Deposit Maturit

Deposits - Time Deposit Maturities (Detail) $ in Thousands	Mar. 31, 2024 USD ($)
Deposits [Abstract]
2024	$ 73,036
2025	16,945
2026	2,981
2027	596
2028	224
2029	67
Total	$ 93,849

Deposits - Additional informati

Deposits - Additional information (Detail) - USD ($)	Mar. 31, 2024	Dec. 31, 2023
Reciprocal deposits	$ 920,000	$ 1,100,000
Deposits from related parties	11,900,000	10,700,000
Time Deposits [Member]
Brokered time deposits	23,600,000	23,600,000
Savings Deposits [Member]
Brokered time deposits	$ 21,200,000	$ 20,900,000

Borrowings - Schedule of Federa

Borrowings - Schedule of Federal Home Loan Bank Advances by Branch of FHLB Bank (Detail) - USD ($) $ in Thousands	Mar. 31, 2024	Dec. 31, 2023
Principal Amounts	$ 78,412	$ 73,007
Federal Home Loan Bank Advances One
Principal Amounts	$ 26,544	$ 21,139
Maturity Dates	2024	2024
Federal Home Loan Bank Advances One | Minimum [Member]
Interest Rates	0%	0%
Federal Home Loan Bank Advances One | Maximum [Member]
Interest Rates	5.53%	5.53%
Federal Home Loan Bank Advances Two
Principal Amounts	$ 520	$ 520
Maturity Dates	2025	2025
Interest Rates	0%	0%
Federal Home Loan Bank Advances Three
Principal Amounts	$ 50,000	$ 50,000
Maturity Dates	2026	2026
Federal Home Loan Bank Advances Three | Minimum [Member]
Interest Rates	4.38%	4.38%
Federal Home Loan Bank Advances Three | Maximum [Member]
Interest Rates	4.48%	4.48%
Federal Home Loan Bank Advances Four
Principal Amounts	$ 718	$ 718
Maturity Dates	2028	2028
Interest Rates	0%	0%
Federal Home Loan Bank Advances Five
Principal Amounts	$ 200	$ 200
Maturity Dates	2030	2030
Interest Rates	0%	0%
Federal Home Loan Bank Advances Six
Principal Amounts	$ 430	$ 430
Maturity Dates	2031	2031
Interest Rates	0%	0%

Borrowings - Additional Informa

Borrowings - Additional Information (Detail) - USD ($) $ in Thousands	Mar. 31, 2024	Dec. 31, 2023
Banks unused remaining borrowing capacity	$ 66,400	$ 71,800
Advances through FLHB	78,412	73,007
Federal home loan bank maximum borrowing capacity	3,000	3,000
Fed Funds Borrowing [Member]
Fed funds borrowing capacity	$ 5,000
Bank Term Funding Program [Member]
Fixed annual rate	4.89%
Borrowing advance outstanding	$ 20,000	20,000
Borrower-In-Custody of Collateral Program [Member]
Fed funds borrowing capacity	49,500
New England Program [Member]
Advances through FLHB	$ 2,700	$ 2,700
Interest rate	0%	0%
FHLB Callable Date May 2, 2024 [Member]
FHLB loan borrowed	$ 25,000	$ 25,000
Interest rate	4.48%	4.48%
FHLB Callable Date December 8, 2025 [Member]
FHLB loan borrowed	$ 25,000
Interest rate	4.38%

Financial Instruments with Of_3

Financial Instruments with Off-Balance Sheet Credit Exposures - Schedule of Notional Amounts of Financial Instruments with Off-Balance Sheet Credit Risk (Detail) - USD ($) $ in Thousands	Mar. 31, 2024	Dec. 31, 2023
Unadvanced portions of loans [Member]
Fair Value, off-Balance-Sheet Risks, Disclosure Information [Line Items]
Unadvanced portions of loans	$ 58,061	$ 46,175
Commitments to originate loans [Member]
Fair Value, off-Balance-Sheet Risks, Disclosure Information [Line Items]
Unadvanced portions of loans	24,401	34,074
Standby letters of credit [Member]
Fair Value, off-Balance-Sheet Risks, Disclosure Information [Line Items]
Unadvanced portions of loans	$ 125	$ 125

Financial Instruments with Of_4

Financial Instruments with Off-Balance Sheet Credit Exposures - Additional Information (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023	Dec. 31, 2023
Credit Loss [Abstract]
Allowance for credit losses on OBS credit exposures	$ 341,000		$ 391,000
Provision for credit losses for off-balance sheet	$ (50,000)	$ 30,000

Employee Benefits - Additional

Employee Benefits - Additional information (Detail) - USD ($)	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023	Dec. 31, 2023
Defined Benefit Plan, Plan Assets, Contributions by Employer	$ 59,000	$ 56,000
Deferred Compensation Liability Current and Noncurrent	2,117,000		$ 2,071,000
Salary Continuation Plan [Member] | Supplemental Employee Retirement Plan [Member]
Liability, Defined Benefit Plan	$ 758,000		735,000
Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, Discount Rate	5%
Employee salary incremental percent	3%
Defined Contribution Plan, Cost	$ 37,000	33,000
Deferred Directors Supplemental Retirement Plan [Member] | Supplemental Employee Retirement Plan [Member]
Pension Cost (Reversal of Cost)	15,000	$ 18,000
Liability, Defined Benefit Plan	$ 566,000		$ 581,000
Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, Discount Rate	6.25%		6.25%
Defined Contribution Plan, Cost	$ 20,000
Previous final base fee, percentage	70%
Revised fixed annual retirement benefits, payable	$ 200,000
Deferred Compensation Liability Current and Noncurrent	$ 757,000		$ 718,000

Stock Based Compensation - Addi

Stock Based Compensation - Additional Information (Detail) - USD ($)						3 Months Ended		12 Months Ended
	Nov. 18, 2024	Nov. 18, 2023	Jun. 01, 2023	May 25, 2023	Nov. 18, 2021	Mar. 31, 2024	Mar. 31, 2023	Dec. 31, 2023
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Number of shares committed to be released each year, ESOP						3,839		15,354
Unearned compensation for ESOP						$ 4,208,000		$ 4,348,000
Stock options granted, outstanding				249,144		249,144
Share price			$ 7.99					$ 7.99
Share based expense recognized						$ 102,000	$ 97,000
Income tax benefit						$ (362,000)	(40,000)
Restricted stock awards granted			2,478					2,478
Fair value related to grant			$ 20,000
Restricted Stock Awards [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Restricted stock awards time-vest		50%
Minimum [Member] | Restricted Stock Awards [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Issued stock option granted, term						3 years
Directors and Members [Member] | Restricted Stock Awards [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Stock Issued During Period, Shares, Restricted Stock Award,					98,850
Share price						$ 11.95
Total fair value related to stock options granted						$ 1,200,000
Scenario Forecast [Member] | Restricted Stock Awards [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Restricted stock awards time-vest	50%
2021 Equity Incentive Plan [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Unearned compensation for ESOP						$ 248,000		$ 350,000
Common stock shares issued during period, new issues						348,801
Issued stock option granted, term						10 years
Income tax benefit						$ 27,000	26,000
Weighted average future recognition period						7 months 6 days		10 months 24 days
2021 Equity Incentive Plan [Member] | Maximum [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Share-based Payment Arrangement, Exercise of Option						249,144
Stock Issued During Period, Shares, Restricted Stock Award,						99,657
2021 Equity Incentive Plan [Member] | Director [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Unearned compensation for ESOP						$ 536,000		$ 598,000
Share based expense recognized						62,000	0
Income tax benefit						$ (17,000)	0
Weighted average future recognition period						2 years 2 months 12 days		2 years 4 months 24 days
First Seacoast Bank Employee Stock Ownership Plan [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Number of shares committed to be released each year, ESOP						15,354
Employee stock option compensation recognized						$ 32,000	$ 38,000
Unearned compensation for ESOP						4,000,000		$ 4,000,000
Employee stock option unallocated share fair value						$ 3,100,000		2,800,000
Employee stock option plan [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Stock repurchase						423,715
Percentage of purchase price common stock						100%
Remaining principal balance of debt						$ 4,200,000		$ 4,200,000

Stock Based Compensation - Sche

Stock Based Compensation - Schedule of Company Compensation Expense for the ESOP (Detail) - shares	Mar. 31, 2024	Dec. 31, 2023
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]
Allocated	55,218	39,864
Committed to be allocated	3,839	15,354
Unallocated	364,658	368,497
Total	423,715	423,715

Stock Based Compensation - Summ

Stock Based Compensation - Summary of Stock Options Outstanding (Details) - USD ($) $ / shares in Units, $ in Thousands		3 Months Ended	12 Months Ended
	May 25, 2023	Mar. 31, 2024	Dec. 31, 2023
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]
Stock options at Beginning period		249,144
Stock options at end of period		249,144	249,144
Stock options at Beginning period		$ 8.06
Stock options at end of period		$ 8.06	$ 8.06
Stock options at beginning period		9 years 1 month 6 days	9 years 1 month 6 days
Stock options at end of period		9 years 1 month 6 days	9 years 1 month 6 days
Stock options at end of period		$ 80
Date of grant		May 25, 2023
Granted	249,144	249,144
Granted		$ 8.06
Vesting period		3 years
Expiration date		May 25, 2033
Expected volatility		27.80%
Expected term		6 years 6 months
Expected dividend yield		0%
Expected forfeiture rate		0%
Risk free interest rate		3.90%
Fair value per option		$ 3

Stock Based Compensation - Su_2

Stock Based Compensation - Summary of Non-vested Restricted Shares Outstanding (Detail) - $ / shares		3 Months Ended	12 Months Ended
	Jun. 01, 2023	Mar. 31, 2024	Dec. 31, 2023
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]
Non-vested at beginning of period		33,629	64,785
Granted	2,478		2,478
Vested			(33,634)
Non-vested at end of period		33,629	33,629
Non-vested at beginning of period		$ 11.8	$ 11.95
Granted	$ 7.99		7.99
Vested			11.8
Non-vested at end of period		$ 11.8	$ 11.8

Leases - Additional Information

Leases - Additional Information (Detail) - USD ($)	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Lessee Lease Description [Line Items]
Future lease payments	$ 641,000
ATM Related Equipment Expires in August 2030
Lessee Lease Description [Line Items]
Loss on disposition of equipment	$ (2,000)
Lease expiration month and year	2030-08
Future lease payments	$ 490,000
Operating lease expense	$ 19,000	$ 0
Branch Office Expires in August 2027
Lessee Lease Description [Line Items]
Lease expiration month and year	2027-08
Future lease payments	$ 142,000
Operating lease expense	$ 10,000	$ 9,000
Branch Office and Certain Equipment [Member]
Lessee Lease Description [Line Items]
Operating leases expiration beginning year	2024
Operating leases expiration ending year	2031
Operating lease option to extend	true
Operating lease, renewal term	4 years

Leases - Summary of Right-of-Us

Leases - Summary of Right-of-Use Asset and Net Lease Liability (Detail) - USD ($) $ in Thousands	Mar. 31, 2024	Dec. 31, 2023
Leases [Abstract]
Right-of-use asset	$ 561	$ 587
Operating Lease, Right-of-Use Asset, Statement of Financial Position [Extensible Enumeration]	Other assets	Other assets
Net lease liability	$ 561	$ 587
Operating Lease, Liability, Statement of Financial Position [Extensible Enumeration]	Other liabilities	Other liabilities

Leases - Components of Operatin

Leases - Components of Operating Lease Cost and Other Related Information (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Leases [Abstract]
Operating lease cost	$ 26	$ 11
Total operating lease cost	26	11
Cash paid for amounts included in the measurement of lease liabilities - operating cash flows from operating leases	$ 26	$ 11
Weighted average lease term remaining (in years)	5 years 7 months 20 days	4 years 1 month 28 days
Weighted average discount rate	5%	3.11%

Leases - Schedule of Total Mini

Leases - Schedule of Total Minimum Lease Payments Due In Future Periods For Lease Agreements (Detail) - USD ($) $ in Thousands	Mar. 31, 2024	Dec. 31, 2023
Leases [Abstract]
Remainder of 2024	$ 93
2025	122
2026	120
2027	107
2028	77
Thereafter	122
Total minimum lease payments	641
Less: interest	(80)
Net lease liability	$ 561	$ 587

Other Comprehensive (Loss) In_3

Other Comprehensive (Loss) Income - Schedule of Accumulated Other Comprehensive (Loss) Income (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Disclosure Of Other Comprehensive Income Loss [Abstract]
Net amortization of bond premiums	$ 150	$ 239
Tax effect	(40)	(64)
Net (loss) income	110	175
Gains on termination of interest rate swaps		(849)
Tax effect		230
Net (loss) income		(619)
Total reclassification adjustments	$ 110	$ (444)

Other Comprehensive (Loss) In_4

Other Comprehensive (Loss) Income - Summary of Changes in Component of AOCI (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Balance at the beginning of the period	$ (5,944)	$ (9,727)
Other comprehensive income (loss) before reclassification	(1,033)	1,252
Amounts reclassified from AOCI	110	(444)
Other comprehensive (loss) income	(923)	808
Balance at the end of the period	(6,867)	(8,919)
Net Unrealized Gains (Losses) on AFS Securities [Member]
Balance at the beginning of the period	(5,944)	(10,428)
Other comprehensive income (loss) before reclassification	(1,033)	1,334
Amounts reclassified from AOCI	110	175
Other comprehensive (loss) income	(923)	1,509
Balance at the end of the period	$ (6,867)	(8,919)
Net Unrealized Gains (Losses) on Cash Flow Hedges [Member]
Balance at the beginning of the period		701
Other comprehensive income (loss) before reclassification		(82)
Amounts reclassified from AOCI		(619)
Other comprehensive (loss) income		$ (701)

Regulatory Matters - Schedule o

Regulatory Matters - Schedule of Regulatory Capital Requirements (Detail) $ in Thousands	Mar. 31, 2024 USD ($)	Dec. 31, 2023 USD ($)
Actual, Total Capital (to risk- weighted assets)	$ 54,737	$ 55,701
Actual, Tier 1 Capital (to risk- weighted assets)	50,930	51,878
Actual, Tier 1 Capital (to average assets)	50,930	51,878
Actual, Common Equity Tier 1 (to risk-weighted assets)	$ 50,930	$ 51,878
Actual Ratio, Total Capital (to risk- weighted assets)	0.1488	0.1532
Actual Ratio, Tier 1 Capital (to risk- weighted assets)	0.1385	0.1427
Actual Ratio, Tier 1 Capital (to average assets)	0.0892	0.0919
Actual Ratio, Common Equity Tier 1 (to risk-weighted assets)	0.1385	0.1427
Minimum Capital Requirement, Total Capital (to risk-weighted assets)	$ 29,425	$ 29,090
Minimum Capital Requirement, Tier 1 Capital (to risk-weighted assets)	22,068	21,818
Minimum Capital Requirement, Tier 1 Capital (to average assets)	22,843	22,592
Minimum Capital Requirement, Common Equity Tier 1 (to risk-weighted assets)	$ 16,551	$ 16,363
Minimum Capital Requirement Ratio, Total Capital (to risk-weighted assets)	0.08	0.08
Minimum Capital Requirement Ratio, Tier 1 Capital (to risk-weighted assets)	0.06	0.06
Minimum Capital Requirement Ratio, Tier 1 Capital (to average assets)	0.04	0.04
Minimum Capital Requirement Ratio, Common Equity Tier 1 (to risk-weighted assets)	4.50%	4.50%
Minimum Capital Required to be Well Capitalized, Total Capital (to risk-weighted assets)	$ 36,781	$ 36,363
Minimum Capital Required to be Well Capitalized, Tier 1 Capital (to risk-weighted assets)	29,425	29,090
Minimum Capital Required to be Well Capitalized, Tier 1 Capital (to average assets)	28,554	28,240
Minimum Capital Required to be Well Capitalized, Common Equity Tier 1 (to risk-weighted assets)	$ 23,908	$ 23,636
Minimum Capital Requirement Ratio, Total Capital (to risk-weighted assets)	0.10	0.10
Minimum Capital Requirement Ratio, Tier 1 Capital (to risk-weighted assets)	0.08	0.08
Minimum Capital Requirement Ratio, Tier 1 Capital (to average assets)	0.05	0.05
Minimum Capital Requirement Ratio, Common Equity Tier 1 (to risk-weighted assets)	0.065	0.065
Fully Phased In [Member]
Minimum Capital Requirement, Total Capital (to risk-weighted assets)	$ 38,620	$ 38,181
Minimum Capital Requirement, Tier 1 Capital (to risk-weighted assets)	31,264	30,908
Minimum Capital Requirement, Tier 1 Capital (to average assets)	22,843	22,592
Minimum Capital Requirement, Common Equity Tier 1 (to risk-weighted assets)	$ 25,747	$ 25,454
Minimum Capital Requirement Ratio, Total Capital (to risk-weighted assets)	0.1050	0.105
Minimum Capital Requirement Ratio, Tier 1 Capital (to risk-weighted assets)	0.085	0.085
Minimum Capital Requirement Ratio, Tier 1 Capital (to average assets)	0.04	0.04
Minimum Capital Requirement Ratio, Common Equity Tier 1 (to risk-weighted assets)	7%	7%

Derivatives and Hedging Activ_3

Derivatives and Hedging Activities - Additional Information (Detail)		3 Months Ended
	Jan. 17, 2023 USD ($)	Mar. 31, 2024 USD ($) Derivative	Mar. 31, 2023 USD ($)	Dec. 31, 2023 USD ($)
Derivatives Fair Value [Line Items]
Interest rate swaps			$ (961,000)
Cumulative amount of fair value hedging adjustment included in the carrying amount of the hedged assets/(liabilities)		$ (81,000)		$ 758,000
Cash in collateral returned		6,713,000		6,069,000
Loans [Member]
Derivatives Fair Value [Line Items]
Cumulative amount of fair value hedging adjustment included in the carrying amount of the hedged assets/(liabilities)		(58,000)		632,000
Securities Available-for-sale, at Fair Value [Member]
Derivatives Fair Value [Line Items]
Cumulative amount of fair value hedging adjustment included in the carrying amount of the hedged assets/(liabilities)		(23,000)		126,000
Interest Rate Swap 2021 [Member]
Derivatives Fair Value [Line Items]
Gain on derivative	$ 849,000
Cash in collateral returned	$ 536,000
Interest Rate Swap Contracts and Customer Loan Swaps [Member]
Derivatives Fair Value [Line Items]
Cash collateral from counterparties		1,800,000		1,600,000
Designated as Hedging Instrument [Member] | Loans [Member]
Derivatives Fair Value [Line Items]
Designated hedged items		50,000,000
Derivative assets, notional amount		50,000,000
Designated as Hedging Instrument [Member] | Securities Available-for-sale, at Fair Value [Member]
Derivatives Fair Value [Line Items]
Designated hedged items		10,000,000		$ 10,000,000
Derivative assets, notional amount		10,000,000
Designated as Hedging Instrument [Member] | Interest Rate Swap [Member]
Derivatives Fair Value [Line Items]
Interest rate swaps		$ 0	$ (112,000)
Fair Value Hedging [Member]
Derivatives Fair Value [Line Items]
Remaining maturity		2 years 5 months 23 days		2 years 8 months 23 days
Average fixed interest rate		4.29%
Fixed annual rate		5.32%
Fair Value Hedging [Member] | Fixed Rate Assets [Member] | Loans [Member]
Derivatives Fair Value [Line Items]
Amortized cost basis of the closed portfolios used in hedging relationships		$ 60,000,000		$ 62,200,000
Cumulative amount of fair value hedging adjustment included in the carrying amount of the hedged assets/(liabilities)		(58,000)		632,000
Fair Value Hedging [Member] | Fixed Rate Assets [Member] | Securities Available-for-sale, at Fair Value [Member]
Derivatives Fair Value [Line Items]
Amortized cost basis of the closed portfolios used in hedging relationships		19,300,000		19,300,000
Cumulative amount of fair value hedging adjustment included in the carrying amount of the hedged assets/(liabilities)		$ (23,000)		$ 126,000
Cash Flow Hedges on 90-day Advances from FHLB [Member] | Interest Rate Swap [Member]
Derivatives Fair Value [Line Items]
Number of notional interest rate swaps | Derivative		2
Cash Flow Hedges on 90-day Advances from FHLB [Member] | Designated as Hedging Instrument [Member] | Interest Rate Swap 2021 [Member]
Derivatives Fair Value [Line Items]
Notional amount		$ 5,000,000

Derivatives and Hedging Activ_4

Derivatives and Hedging Activities - Summary of Balance Sheet Related to Cumulative Basis Adjustment for Fair Value Hedges (Detail) - USD ($) $ in Thousands	Mar. 31, 2024	Dec. 31, 2023
Derivatives Fair Value [Line Items]
Carrying Amount of Hedged Assets/(Liabilities)	$ 59,919	$ 60,758
Cumulative amount of fair value hedging adjustment included in the carrying amount of the hedged assets/(liabilities)	(81)	758
Securities Available-for-sale, at Fair Value [Member]
Derivatives Fair Value [Line Items]
Carrying Amount of Hedged Assets/(Liabilities)	9,977	10,126
Cumulative amount of fair value hedging adjustment included in the carrying amount of the hedged assets/(liabilities)	(23)	126
Loans [Member]
Derivatives Fair Value [Line Items]
Carrying Amount of Hedged Assets/(Liabilities)	49,942	50,632
Cumulative amount of fair value hedging adjustment included in the carrying amount of the hedged assets/(liabilities)	$ (58)	$ 632

Derivatives and Hedging Activ_5

Derivatives and Hedging Activities - Summary of Fair Values of Derivative Financial Instruments Classification on Consolidated Balance Sheets (Details) - USD ($) $ in Thousands		Mar. 31, 2024	Dec. 31, 2023
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Derivative Assets, Fair value		$ 103	$ 90
Derivative Liabilities, Fair value		22	848
Designated as Hedging Instrument [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Derivative Assets, Fair value		81
Derivative Liabilities, Fair value			758
Derivatives Not Designated as Hedging Instruments [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Derivative Assets, Fair value		22	90
Derivative Liabilities, Fair value		22	90
Interest Rate Contract [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Derivative Assets, Fair value	[1]	81
Derivative Liabilities, Fair value	[1]		758
Interest Rate Contract [Member] | Designated as Hedging Instrument [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Derivative Assets, Fair value		81
Derivative Liabilities, Fair value			758
Interest Rate Contract [Member] | Fair Value Hedging [Member] | Designated as Hedging Instrument [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Derivative Assets, Notional amount		$ 60,000
Hedged Asset, Statement of Financial Position [Extensible Enumeration]		Other assets
Hedged Liability, Statement of Financial Position [Extensible Enumeration]		Other liabilities
Interest Rate Contract [Member] | Cash Flow Hedging [Member] | Designated as Hedging Instrument [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Derivative Assets, Notional amount			$ 60,000
Hedged Asset, Statement of Financial Position [Extensible Enumeration]			Other assets
Hedged Liability, Statement of Financial Position [Extensible Enumeration]			Other liabilities
Customer Loan Swaps [Member] | Derivatives Not Designated as Hedging Instruments [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Derivative Assets, Notional amount		$ 4,732	$ 4,766
Hedged Asset, Statement of Financial Position [Extensible Enumeration]		Other assets	Other assets
Derivative Assets, Fair value		$ 22	$ 90
Derivative Liabilities, Notional Amount		$ 4,732	$ 4,766
Hedged Liability, Statement of Financial Position [Extensible Enumeration]		Other liabilities	Other liabilities
Derivative Liabilities, Fair value		$ 22	$ 90
[1] Interest rate swap contracts were completed with the same dealer bank. The Company maintains a master netting arrangement with the counterparty and settles collateral on a net basis for all contracts.

Derivatives and Hedging Activ_6

Derivatives and Hedging Activities - Summary of Derivative Position offset in Consolidated Balance Sheets (Details) - USD ($) $ in Thousands		Mar. 31, 2024	Dec. 31, 2023
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Derivative Assets, Gross Amounts Recognized		$ 103	$ 90
Derivative Assets, Net Amounts Recognized		103	90
Derivative Assets, Cash Collateral Pledged (Received)	[1]	81	90
Derivative Asset, Net Amount		22
Derivative Liabilities, Gross Amounts Recognized		22	848
Derivative Liabilities, Net Amounts Recognized		22	848
Derivative Liabilities, Cash Collateral Pledged (Received)	[1]	22	758
Derivative Liabilities, Net Amount			90
Interest Rate Contract [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Derivative Assets, Gross Amounts Recognized	[2]	81
Derivative Assets, Net Amounts Recognized	[2]	81
Derivative Assets, Cash Collateral Pledged (Received)	[1],[2]	81
Derivative Liabilities, Gross Amounts Recognized	[2]		758
Derivative Liabilities, Net Amounts Recognized	[2]		758
Derivative Liabilities, Cash Collateral Pledged (Received)	[1],[2]		758
Customer Loan Swaps - Commercial Customer [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Derivative Liabilities, Gross Amounts Recognized	[3]	22	90
Derivative Liabilities, Net Amounts Recognized	[3]	22	90
Derivative Liabilities, Cash Collateral Pledged (Received)	[1],[3]	22
Derivative Liabilities, Net Amount	[3]		90
Customer Loan Swaps - Dealer Bank [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Derivative Assets, Gross Amounts Recognized	[3]	22	90
Derivative Assets, Net Amounts Recognized	[3]	22	90
Derivative Assets, Cash Collateral Pledged (Received)	[1],[3]		$ 90
Derivative Asset, Net Amount	[3]	$ 22
[1] The amount presented was the lesser of the amount pledged (received) or the net amount presented in the consolidated balance sheets. Interest rate swap contracts were completed with the same dealer bank. The Company maintains a master netting arrangement with the counterparty and settles collateral on a net basis for all contracts. The Company manages its net exposure on its commercial customer loan swaps by obtaining collateral as part of the normal loan policy and underwriting practices. The Company does not post collateral to its commercial customers as part of its contract.

Fair Values of Assets and Lia_3

Fair Values of Assets and Liabilities - Summary of Financial Assets and Liabilities Measured at Fair Value on a Recurring Basis (Detail) - USD ($) $ in Thousands	Mar. 31, 2024		Dec. 31, 2023
Securities available-for-sale:
Securities available-for-sale, at fair value	$ 124,199		$ 121,854
U.S. Government-sponsored enterprises obligations [Member]
Securities available-for-sale:
Securities available-for-sale, at fair value	1,380		1,398
U.S. Government agency small business administration pools guaranteed by SBA [Member]
Securities available-for-sale:
Securities available-for-sale, at fair value	14,782	[1]	15,583
Collateralized mortgage obligations issued by the FHLMC, FNMA and GNMA [Member]
Securities available-for-sale:
Securities available-for-sale, at fair value	5,474		2,474
Residential mortgage backed securities [Member]
Securities available-for-sale:
Securities available-for-sale, at fair value	39,323	[1]	38,221
Municipal bonds [Member]
Securities available-for-sale:
Securities available-for-sale, at fair value	53,494		54,692
Corporate debt [Member]
Securities available-for-sale:
Securities available-for-sale, at fair value	493		492
Corporate subordinated debt [Member]
Securities available-for-sale:
Securities available-for-sale, at fair value	9,253		8,994
Fair Value, Measurements, Recurring [Member] | U.S. Government-sponsored enterprises obligations [Member]
Securities available-for-sale:
Securities available-for-sale, at fair value	1,380		1,398
Fair Value, Measurements, Recurring [Member] | U.S. Government agency small business administration pools guaranteed by SBA [Member]
Securities available-for-sale:
Securities available-for-sale, at fair value	14,782		15,583
Fair Value, Measurements, Recurring [Member] | Collateralized mortgage obligations issued by the FHLMC, FNMA and GNMA [Member]
Securities available-for-sale:
Securities available-for-sale, at fair value	5,474		2,474
Fair Value, Measurements, Recurring [Member] | Residential mortgage backed securities [Member]
Securities available-for-sale:
Securities available-for-sale, at fair value	39,323		38,221
Fair Value, Measurements, Recurring [Member] | Municipal bonds [Member]
Securities available-for-sale:
Securities available-for-sale, at fair value	53,494		54,692
Fair Value, Measurements, Recurring [Member] | Corporate debt [Member]
Securities available-for-sale:
Securities available-for-sale, at fair value	493		492
Fair Value, Measurements, Recurring [Member] | Corporate subordinated debt [Member]
Securities available-for-sale:
Securities available-for-sale, at fair value	9,253		8,994
Fair Value, Measurements, Recurring [Member] | Derivative [Member]
Other assets:
Other assets, at fair value	103		90
Other liabilities:
Other liabilities, at fair value	22		848
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | U.S. Government-sponsored enterprises obligations [Member]
Securities available-for-sale:
Securities available-for-sale, at fair value	1,380		1,398
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | U.S. Government agency small business administration pools guaranteed by SBA [Member]
Securities available-for-sale:
Securities available-for-sale, at fair value	14,782		15,583
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Collateralized mortgage obligations issued by the FHLMC, FNMA and GNMA [Member]
Securities available-for-sale:
Securities available-for-sale, at fair value	5,474		2,474
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Residential mortgage backed securities [Member]
Securities available-for-sale:
Securities available-for-sale, at fair value	39,323		38,221
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Municipal bonds [Member]
Securities available-for-sale:
Securities available-for-sale, at fair value	53,494		54,692
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Corporate debt [Member]
Securities available-for-sale:
Securities available-for-sale, at fair value	493		492
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Corporate subordinated debt [Member]
Securities available-for-sale:
Securities available-for-sale, at fair value	9,253		8,994
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Derivative [Member]
Other assets:
Other assets, at fair value	103		90
Other liabilities:
Other liabilities, at fair value	22		848
Fair Value, Measurements, Recurring [Member] | Mortgage servicing rights [Member]
Other assets:
Other assets, at fair value	329		339
Fair Value, Measurements, Recurring [Member] | Mortgage servicing rights [Member] | Fair Value, Inputs, Level 3 [Member]
Other assets:
Other assets, at fair value	$ 329		$ 339
[1] Actual maturities for these debt securities are dependent upon the interest rate environment and prepayments on the underlying loans.

Fair Values of Assets and Lia_4

Fair Values of Assets and Liabilities - Summary of Changes in Level 3 Assets and Liabilities Measured at Fair Value on a Recurring Basis (Detail) - Fair Value, Inputs, Level 3 [Member] - Fair Value, Measurements, Recurring [Member] - Mortgage servicing rights [Member] - USD ($) $ in Thousands		3 Months Ended
		Mar. 31, 2024	Mar. 31, 2023
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Beginning Balance	[1]	$ 339	$ 357
Included in net (loss) income	[1]	(10)	(8)
Ending Balance	[1]	$ 329	$ 349
[1] Realized and unrealized gains and losses related to mortgage servicing rights are reported as a component of loan servicing fee income in the Company’s consolidated statements of (loss) income.

Fair Values of Assets and Lia_5

Fair Values of Assets and Liabilities - Summary of Significant Unobservable Inputs used in Level 3 Assets Measured at Fair Value on Recurring Basis (Detail) - Fair Value, Inputs, Level 3 [Member] - Fair Value, Measurements, Recurring [Member] $ in Thousands		3 Months Ended	12 Months Ended
		Mar. 31, 2024 USD ($)	Dec. 31, 2023 USD ($)	Mar. 31, 2023 USD ($)	Dec. 31, 2022 USD ($)
Mortgage servicing rights [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Mortgage Servicing Rights	[1]	$ 329	$ 339	$ 349	$ 357
Prepayment Rate [Member] | Mortgage servicing rights [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Servicing Asset, Valuation Technique [Extensible List]		us-gaap:ValuationTechniqueDiscountedCashFlowMember	us-gaap:ValuationTechniqueDiscountedCashFlowMember
Mortgage Servicing Rights		$ 329	$ 339
Prepayment Rate [Member] | Minimum [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Mortgage Servicing Rights, Measuring Inputs		0.0501	0.0535
Prepayment Rate [Member] | Maximum [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Mortgage Servicing Rights, Measuring Inputs		0.1731	0.2053
Prepayment Rate [Member] | Weighted Average [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Mortgage Servicing Rights, Measuring Inputs	[2]	0.0667	0.0685
Fair value valuation techniques		Prepayment Rate	Prepayment Rate
Discount Rate [Member] | Minimum [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Mortgage Servicing Rights, Measuring Inputs		0.0975	0.0938
Discount Rate [Member] | Weighted Average [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Mortgage Servicing Rights, Measuring Inputs	[2]	0.0975	0.0938
Fair value valuation techniques		Discount Rate	Discount Rate
Delinquency Rate [Member] | Minimum [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Mortgage Servicing Rights, Measuring Inputs		0.0216	0.0208
Delinquency Rate [Member] | Maximum [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Mortgage Servicing Rights, Measuring Inputs		0.0277	0.026
Delinquency Rate [Member] | Weighted Average [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Mortgage Servicing Rights, Measuring Inputs	[2]	0.0227	0.0217
Fair value valuation techniques		Delinquency Rate	Delinquency Rate
Default Rate [Member] | Minimum [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Mortgage Servicing Rights, Measuring Inputs		0.0014	0.0012
Default Rate [Member] | Maximum [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Mortgage Servicing Rights, Measuring Inputs		0.0018	0.0014
Default Rate [Member] | Weighted Average [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Mortgage Servicing Rights, Measuring Inputs	[2]	0.0015	0.0014
Fair value valuation techniques		Default Rate	Default Rate
[1] Realized and unrealized gains and losses related to mortgage servicing rights are reported as a component of loan servicing fee income in the Company’s consolidated statements of (loss) income. Unobservable inputs for mortgage servicing rights were weighted by loan amount.

Fair Values of Assets and Lia_6

Fair Values of Assets and Liabilities - Additional Information (Detail) - USD ($)	Mar. 31, 2024	Dec. 31, 2023
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Non-financial assets and liabilities measured at fair value on a recurring basis	$ 0
Foreclosed assets	0	$ 0
Fair Value, Nonrecurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Financial Assets, Fair Value Disclosure	$ 0	$ 0

Fair Values of Assets and Lia_7

Fair Values of Assets and Liabilities - Fair Value Measurements, Recurring and Nonrecurring (Detail) - USD ($) $ in Thousands	Mar. 31, 2024	Dec. 31, 2023
Financial Assets:
Cash and due from banks	$ 6,713	$ 6,069
Federal Home Loan Bank stock	3,448	2,986
Bank-owned life insurance	4,683	4,663
Loans, net	428,431	426,641
Accrued interest receivable	2,368	2,294
Financial Liabilities:
Deposits	405,595	404,798
Advances from Federal Home Loan Bank	78,412	73,007
Advances from Federal Reserve Bank	20,000	20,000
Mortgagors’ tax escrow	2,079	640
Accrued interest payable	644	380
Cash and due from banks [Member]
Financial Assets:
Financial Assets, Fair Value Disclosure	6,713	6,069
Federal Home Loan Bank stock [Member]
Financial Assets:
Financial Assets, Fair Value Disclosure	3,448	2,986
Bank-owned life insurance [Member]
Financial Assets:
Financial Assets, Fair Value Disclosure	4,683	4,663
Loans, net [Member]
Financial Assets:
Financial Assets, Fair Value Disclosure	381,372	376,772
Accrued interest receivable [member]
Financial Assets:
Financial Assets, Fair Value Disclosure	2,368	2,294
Deposits [Member]
Financial Liabilities:
Financial Liabilities Fair Value Disclosure	404,371	403,489
Federal Home Loan Bank Borrowings [Member]
Financial Liabilities:
Financial Liabilities Fair Value Disclosure	78,162	73,162
Federal Reserve Bank Advances [Member]
Financial Liabilities:
Financial Liabilities Fair Value Disclosure	19,966	20,020
Mortgagors' tax escrow [Member]
Financial Liabilities:
Financial Liabilities Fair Value Disclosure	2,079	640
Accrued interest payable [member]
Financial Liabilities:
Financial Liabilities Fair Value Disclosure	644	380
Fair Value, Inputs, Level 1 [Member] | Cash and due from banks [Member]
Financial Assets:
Financial Assets, Fair Value Disclosure	6,713	6,069
Fair Value, Inputs, Level 1 [Member] | Accrued interest receivable [member]
Financial Assets:
Financial Assets, Fair Value Disclosure	2,368	2,294
Fair Value, Inputs, Level 1 [Member] | Deposits [Member]
Financial Liabilities:
Financial Liabilities Fair Value Disclosure	311,745	313,503
Fair Value, Inputs, Level 1 [Member] | Accrued interest payable [member]
Financial Liabilities:
Financial Liabilities Fair Value Disclosure	644	380
Fair Value, Inputs, Level 2 [Member] | Federal Home Loan Bank stock [Member]
Financial Assets:
Financial Assets, Fair Value Disclosure	3,448	2,986
Fair Value, Inputs, Level 2 [Member] | Bank-owned life insurance [Member]
Financial Assets:
Financial Assets, Fair Value Disclosure	4,683	4,663
Fair Value, Inputs, Level 2 [Member] | Deposits [Member]
Financial Liabilities:
Financial Liabilities Fair Value Disclosure	92,626	89,986
Fair Value, Inputs, Level 2 [Member] | Federal Home Loan Bank Borrowings [Member]
Financial Liabilities:
Financial Liabilities Fair Value Disclosure	78,162	73,162
Fair Value, Inputs, Level 2 [Member] | Federal Reserve Bank Advances [Member]
Financial Liabilities:
Financial Liabilities Fair Value Disclosure	19,966	20,020
Fair Value, Inputs, Level 2 [Member] | Mortgagors' tax escrow [Member]
Financial Liabilities:
Financial Liabilities Fair Value Disclosure	2,079	640
Fair Value, Inputs, Level 3 [Member] | Loans, net [Member]
Financial Assets:
Financial Assets, Fair Value Disclosure	$ 381,372	$ 376,772

Subsequent Events - Additional

Subsequent Events - Additional Information (Detail) - Subsequent Event [Member] $ in Millions	May 03, 2024 USD ($)	Apr. 17, 2024 USD ($) Branch Property	Apr. 11, 2024 shares	Apr. 29, 2024 USD ($)
Subsequent Event [Line Items]
Number of shares authorized for repurchase | shares			507,707
Percentage of repurchase of Common Stock			10%
Stock repurchase program expiration			12 months
Initial Term of Lease Agreement		15 years
FHLB loan borrowed				$ 25
Interest rate				4.75%
Brokered deposits one [Member]
Subsequent Event [Line Items]
Brokered deposits	$ 5.7
Percentage of annual rate for brokered deposits	5.20%
Maturity of time deposits	1 year
Description of maturities of time deposits	maturity date beginning on August 3, 2024 and quarterly thereafter.
Brokered deposits two [Member]
Subsequent Event [Line Items]
Brokered deposits	$ 2.4
Percentage of annual rate for brokered deposits	5.20%
Maturity of time deposits	2 years
Description of maturities of time deposits	maturity date beginning on November 3, 2024 and quarterly thereafter.
FSB Wealth Management [Member]
Subsequent Event [Line Items]
Number of Standalone Branches | Branch		3
Aggregate Cash Purchase Price		$ 7.9
Office and Branch [Member]
Subsequent Event [Line Items]
Number of properties owned and operated | Property		5