Loans Receivable and Allowance for Credit Losses - Allowance for Loan Losses and Loans, Net of Unearned Fees and Discounts, by Segment (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Allowance for loan losses:
Collectively evaluated for impairment		$ 2,032
Total ending allowance balance	$ 5,121	2,032	$ 2,669
Total ending allowance balance		2,032
Loans:
Individually evaluated for impairment		2,715
Collectively evaluated for impairment		1,294,081
Total ending loan balance	1,308,552	1,296,796
Residential Mortgage
Allowance for loan losses:
Collectively evaluated for impairment		1,263
Total ending allowance balance	4,502	1,263	1,814
Total ending allowance balance		1,263
Loans:
Individually evaluated for impairment		2,693
Collectively evaluated for impairment		1,255,300
Total ending loan balance		1,257,993
Construction, Commercial and Other Mortgage Loans
Allowance for loan losses:
Collectively evaluated for impairment		434
Total ending allowance balance	514	434	435
Total ending allowance balance		434
Loans:
Collectively evaluated for impairment		23,775
Total ending loan balance		23,775
Home Equity Loans and Lines of Credit
Allowance for loan losses:
Collectively evaluated for impairment		1
Total ending allowance balance		1	1
Total ending allowance balance		1
Loans:
Individually evaluated for impairment		16
Collectively evaluated for impairment		6,411
Total ending loan balance		6,427
Consumer and other
Allowance for loan losses:
Collectively evaluated for impairment		75
Total ending allowance balance	$ 105	75	89
Total ending allowance balance		75
Loans:
Collectively evaluated for impairment		8,595
Total ending loan balance		8,595
Unallocated
Allowance for loan losses:
Collectively evaluated for impairment		259
Total ending allowance balance		259	$ 330
Total ending allowance balance		259
Loans:
Individually evaluated for impairment		6
Total ending loan balance		$ 6