Loans Receivable and Allowance for Credit Losses - Activity in Allowance for Loan Losses by Segment (Details) - USD ($)	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Activity in allowance for loan losses
Balance, beginning of period	$ 2,032,000	$ 2,669,000
(Reversal of provision) provision for credit losses	(3,000)	(576,000)
Allowance for loan losses on loans receivable after (reversal of provision) provision for loan losses	5,238,000	2,093,000
Charge-offs	(157,000)	(62,000)
Recoveries	40,000	1,000
Net charge-offs	(117,000)	(61,000)
Balance, end of period	5,121,000	2,032,000
Activity in allowance for loan losses, prior adoption
Balance, beginning of period	2,032,000
(Reversal of provision) provision for loan losses		(576,000)
Balance, end of period		2,032,000
Adoption of ASU No. 2016-13 | Accounting Standards Update 2016-13 [Member]
Activity in allowance for loan losses
Balance, end of period	3,209,000
Residential Mortgage
Activity in allowance for loan losses
Balance, beginning of period	1,263,000	1,814,000
(Reversal of provision) provision for credit losses	(110,000)	(551,000)
Allowance for loan losses on loans receivable after (reversal of provision) provision for loan losses	4,546,000	1,263,000
Charge-offs	(75,000)
Recoveries	31,000
Net charge-offs	(44,000)
Balance, end of period	4,502,000	1,263,000
Activity in allowance for loan losses, prior adoption
Balance, beginning of period	1,263,000
Balance, end of period		1,263,000
Residential Mortgage | Adoption of ASU No. 2016-13 | Accounting Standards Update 2016-13 [Member]
Activity in allowance for loan losses
Balance, end of period	3,393,000
Construction, Commercial and Other Mortgage Loans
Activity in allowance for loan losses
Balance, beginning of period	434,000	435,000
(Reversal of provision) provision for credit losses	9,000	(1,000)
Allowance for loan losses on loans receivable after (reversal of provision) provision for loan losses	514,000	434,000
Balance, end of period	514,000	434,000
Activity in allowance for loan losses, prior adoption
Balance, beginning of period	434,000
Balance, end of period		434,000
Construction, Commercial and Other Mortgage Loans | Adoption of ASU No. 2016-13 | Accounting Standards Update 2016-13 [Member]
Activity in allowance for loan losses
Balance, end of period	71,000
Home Equity Loans and Lines of Credit
Activity in allowance for loan losses
Balance, beginning of period	1,000	1,000
Allowance for loan losses on loans receivable after (reversal of provision) provision for loan losses		1,000
Balance, end of period		1,000
Activity in allowance for loan losses, prior adoption
Balance, beginning of period	1,000
Balance, end of period		1,000
Home Equity Loans and Lines of Credit | Adoption of ASU No. 2016-13 | Accounting Standards Update 2016-13 [Member]
Activity in allowance for loan losses
Balance, end of period	(1,000)
Unallocated
Activity in allowance for loan losses
Balance, beginning of period	259,000	330,000
(Reversal of provision) provision for credit losses		(71,000)
Allowance for loan losses on loans receivable after (reversal of provision) provision for loan losses		259,000
Balance, end of period		259,000
Activity in allowance for loan losses, prior adoption
Balance, beginning of period	259,000
Balance, end of period		259,000
Unallocated | Adoption of ASU No. 2016-13 | Accounting Standards Update 2016-13 [Member]
Activity in allowance for loan losses
Balance, end of period	(259,000)
Consumer and other
Activity in allowance for loan losses
Balance, beginning of period	75,000	89,000
(Reversal of provision) provision for credit losses	98,000	47,000
Allowance for loan losses on loans receivable after (reversal of provision) provision for loan losses	178,000	136,000
Charge-offs	(82,000)	(62,000)
Recoveries	9,000	1,000
Net charge-offs	(73,000)	(61,000)
Balance, end of period	105,000	75,000
Activity in allowance for loan losses, prior adoption
Balance, beginning of period	75,000
Balance, end of period		$ 75,000
Consumer and other | Adoption of ASU No. 2016-13 | Accounting Standards Update 2016-13 [Member]
Activity in allowance for loan losses
Balance, end of period	$ 5,000