Loans Receivable and Allowance for Credit Losses - Components (Details) - USD ($) $ in Thousands	Mar. 31, 2024	Dec. 31, 2023	Mar. 31, 2023	Dec. 31, 2022
Components of loans receivable, net of allowance for credit losses
Net unearned fees and discounts	$ (2,047)	$ (1,989)
Total loans, net of unearned fees and discounts	1,309,712	1,308,552
Allowance for credit/loan losses	(5,142)	(5,121)	$ (5,127)	$ (2,032)
Loans receivable, net of allowance for credit losses	1,304,570	1,303,431
Other Financing Receivables
Components of loans receivable, net of allowance for credit losses
Total loans	8,485	8,453
Unallocated
Components of loans receivable, net of allowance for credit losses
Allowance for credit/loan losses				$ (259)
Real estate loans
Components of loans receivable, net of allowance for credit losses
Total loans	1,303,274	1,302,088
Real estate loans | One- to four-family residential
Components of loans receivable, net of allowance for credit losses
Total loans	1,275,897	1,277,544
Real estate loans | Multi-family residential
Components of loans receivable, net of allowance for credit losses
Total loans	5,604	5,855
Real estate loans | Construction, Commercial and Other Mortgage Loans
Components of loans receivable, net of allowance for credit losses
Total loans	12,554	11,631
Real estate loans | Home Equity Loans and Lines of Credit
Components of loans receivable, net of allowance for credit losses
Total loans	9,219	7,058
Other loans | Loans on Deposit Accounts
Components of loans receivable, net of allowance for credit losses
Total loans	180	196
Other loans | Consumer and other
Components of loans receivable, net of allowance for credit losses
Total loans	$ 8,305	$ 8,257