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 [Member]		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]				5,068,540
Accounting Standards Update [Extensible Enumeration]				Accounting Standards Update 2016-13 [Member]							Accounting Standards Update 2016-13 [Member]
Net Income (Loss)		(987)							(987)
Other comprehensive loss		(5,056)										(5,056)
Reorganization: Conversion of First Seacoast Bancorp, Inc.		25,722			$ (10)		25,732
Reorganization: Conversion of First Seacoast Bancorp, Inc. , Shares					6,598
Issuance of stock compensation							20									(20)
Issuance of stock compensation, (shares)					2,478
Purchase of common stock by the ESOP		(2,244)														(2,244)
Amortization of unearned stock compensation		386					88									298
ESOP shares earned		99					(16)									115
Ending Balance at Sep. 30, 2023		67,262			$ 52		52,592		35,266			(14,783)		(1,377)		(4,488)
Ending Balance (shares) at Sep. 30, 2023					5,077,616
Beginning Balance at Jun. 30, 2023		72,836			$ 52		52,534		36,177			(9,922)		(1,377)		(4,628)
Beginning Balance (shares) at Jun. 30, 2023					5,077,616
Net Income (Loss)		(911)							(911)
Other comprehensive loss		(4,861)										(4,861)
Amortization of unearned stock compensation		169					67									102
ESOP shares earned		29					(9)									38
Ending Balance at Sep. 30, 2023		67,262			$ 52		52,592		35,266			(14,783)		(1,377)		(4,488)
Ending Balance (shares) at Sep. 30, 2023					5,077,616
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 Income (Loss)		895							895
Other comprehensive loss		969										969
Treasury stock activity		(3,288)												(3,288)
Treasury stock activity (shares)					(358,702)
Amortization of unearned stock compensation		492					186									306
ESOP shares earned		103					(12)									115
Ending Balance at Sep. 30, 2024		65,789			$ 52		52,816		26,492			(4,975)		(4,669)		(3,927)
Ending Balance (shares) at Sep. 30, 2024					4,718,462
Beginning Balance at Jun. 30, 2024		64,500			$ 52		52,757		26,448			(7,153)		(3,537)		(4,067)
Beginning Balance (shares) at Jun. 30, 2024					4,841,445
Net Income (Loss)		44							44
Other comprehensive loss		2,178										2,178
Treasury stock activity		(1,132)												(1,132)
Treasury stock activity (shares)					(122,983)
Amortization of unearned stock compensation		164					62									102
ESOP shares earned		35					(3)									38
Ending Balance at Sep. 30, 2024		$ 65,789			$ 52		$ 52,816		$ 26,492			$ (4,975)		$ (4,669)		$ (3,927)
Ending Balance (shares) at Sep. 30, 2024					4,718,462

[1] Adjusted for conversion of First Seacoast Bancorp, Inc.