Loans, Allowance for Credit Losses and Credit Quality - Schedule of Information Regarding Past Due Loans (Details) - USD ($) $ in Thousands	Mar. 31, 2024	Dec. 31, 2023
Financing Receivable Recorded Investment Past Due [Line Items]
Total Loans	$ 1,079,898	$ 1,048,606
90 days or more and accruing	0	0
Loans on Non-accrual	1,203	1,213
30–59 Days
Financing Receivable Recorded Investment Past Due [Line Items]
Total Loans	910	1,083
60–89 Days
Financing Receivable Recorded Investment Past Due [Line Items]
Total Loans	273	225
90 Days or More
Financing Receivable Recorded Investment Past Due [Line Items]
Total Loans	14	817
Total Past Due
Financing Receivable Recorded Investment Past Due [Line Items]
Total Loans	1,197	2,125
Total Current
Financing Receivable Recorded Investment Past Due [Line Items]
Total Loans	1,078,701	1,046,481
Real Estate Loans | Home Equity Lines of Credit and Loans
Financing Receivable Recorded Investment Past Due [Line Items]
Total Loans	33,696	33,357
90 days or more and accruing	0	0
Loans on Non-accrual	22	22
Real Estate Loans | 30–59 Days | Home Equity Lines of Credit and Loans
Financing Receivable Recorded Investment Past Due [Line Items]
Total Loans	189	360
Real Estate Loans | 60–89 Days | Home Equity Lines of Credit and Loans
Financing Receivable Recorded Investment Past Due [Line Items]
Total Loans	0	0
Real Estate Loans | 90 Days or More | Home Equity Lines of Credit and Loans
Financing Receivable Recorded Investment Past Due [Line Items]
Total Loans	14	8
Real Estate Loans | Total Past Due | Home Equity Lines of Credit and Loans
Financing Receivable Recorded Investment Past Due [Line Items]
Total Loans	203	368
Real Estate Loans | Total Current | Home Equity Lines of Credit and Loans
Financing Receivable Recorded Investment Past Due [Line Items]
Total Loans	33,493	32,989
Real Estate Loans | One- to Four-Family Residential
Financing Receivable Recorded Investment Past Due [Line Items]
Total Loans	410,989	410,131
90 days or more and accruing	0	0
Loans on Non-accrual	1,181	1,191
Real Estate Loans | One- to Four-Family Residential | 30–59 Days
Financing Receivable Recorded Investment Past Due [Line Items]
Total Loans	717	722
Real Estate Loans | One- to Four-Family Residential | 60–89 Days
Financing Receivable Recorded Investment Past Due [Line Items]
Total Loans	272	225
Real Estate Loans | One- to Four-Family Residential | 90 Days or More
Financing Receivable Recorded Investment Past Due [Line Items]
Total Loans	0	809
Real Estate Loans | One- to Four-Family Residential | Total Past Due
Financing Receivable Recorded Investment Past Due [Line Items]
Total Loans	989	1,756
Real Estate Loans | One- to Four-Family Residential | Total Current
Financing Receivable Recorded Investment Past Due [Line Items]
Total Loans	410,000	408,375
Real Estate Loans | Multi Family
Financing Receivable Recorded Investment Past Due [Line Items]
Total Loans	311,147	287,361
90 days or more and accruing	0	0
Loans on Non-accrual	0	0
Real Estate Loans | Multi Family | 30–59 Days
Financing Receivable Recorded Investment Past Due [Line Items]
Total Loans	0	0
Real Estate Loans | Multi Family | 60–89 Days
Financing Receivable Recorded Investment Past Due [Line Items]
Total Loans	0	0
Real Estate Loans | Multi Family | 90 Days or More
Financing Receivable Recorded Investment Past Due [Line Items]
Total Loans	0	0
Real Estate Loans | Multi Family | Total Past Due
Financing Receivable Recorded Investment Past Due [Line Items]
Total Loans	0	0
Real Estate Loans | Multi Family | Total Current
Financing Receivable Recorded Investment Past Due [Line Items]
Total Loans	311,147	287,361
Real Estate Loans | Commercial Real Estate Loans
Financing Receivable Recorded Investment Past Due [Line Items]
Total Loans	202,124	196,365
90 days or more and accruing	0	0
Loans on Non-accrual	0	0
Real Estate Loans | Commercial Real Estate Loans | 30–59 Days
Financing Receivable Recorded Investment Past Due [Line Items]
Total Loans	0	0
Real Estate Loans | Commercial Real Estate Loans | 60–89 Days
Financing Receivable Recorded Investment Past Due [Line Items]
Total Loans	0	0
Real Estate Loans | Commercial Real Estate Loans | 90 Days or More
Financing Receivable Recorded Investment Past Due [Line Items]
Total Loans	0	0
Real Estate Loans | Commercial Real Estate Loans | Total Past Due
Financing Receivable Recorded Investment Past Due [Line Items]
Total Loans	0	0
Real Estate Loans | Commercial Real Estate Loans | Total Current
Financing Receivable Recorded Investment Past Due [Line Items]
Total Loans	202,124	196,365
Real Estate Loans | Construction
Financing Receivable Recorded Investment Past Due [Line Items]
Total Loans	107,428	112,000
90 days or more and accruing	0	0
Loans on Non-accrual	0	0
Real Estate Loans | Construction | 30–59 Days
Financing Receivable Recorded Investment Past Due [Line Items]
Total Loans	0	0
Real Estate Loans | Construction | 60–89 Days
Financing Receivable Recorded Investment Past Due [Line Items]
Total Loans	0	0
Real Estate Loans | Construction | 90 Days or More
Financing Receivable Recorded Investment Past Due [Line Items]
Total Loans	0	0
Real Estate Loans | Construction | Total Past Due
Financing Receivable Recorded Investment Past Due [Line Items]
Total Loans	0	0
Real Estate Loans | Construction | Total Current
Financing Receivable Recorded Investment Past Due [Line Items]
Total Loans	107,428	112,000
Other Loans | Commercial Loans
Financing Receivable Recorded Investment Past Due [Line Items]
Total Loans	14,358	9,219
90 days or more and accruing	0	0
Loans on Non-accrual	0	0
Other Loans | Commercial Loans | 30–59 Days
Financing Receivable Recorded Investment Past Due [Line Items]
Total Loans	0	0
Other Loans | Commercial Loans | 60–89 Days
Financing Receivable Recorded Investment Past Due [Line Items]
Total Loans	0	0
Other Loans | Commercial Loans | 90 Days or More
Financing Receivable Recorded Investment Past Due [Line Items]
Total Loans	0	0
Other Loans | Commercial Loans | Total Past Due
Financing Receivable Recorded Investment Past Due [Line Items]
Total Loans	0	0
Other Loans | Commercial Loans | Total Current
Financing Receivable Recorded Investment Past Due [Line Items]
Total Loans	14,358	9,219
Other Loans | Consumer
Financing Receivable Recorded Investment Past Due [Line Items]
Total Loans	156	173
90 days or more and accruing	0	0
Loans on Non-accrual	0	0
Other Loans | Consumer | 30–59 Days
Financing Receivable Recorded Investment Past Due [Line Items]
Total Loans	4	1
Other Loans | Consumer | 60–89 Days
Financing Receivable Recorded Investment Past Due [Line Items]
Total Loans	1	0
Other Loans | Consumer | 90 Days or More
Financing Receivable Recorded Investment Past Due [Line Items]
Total Loans	0	0
Other Loans | Consumer | Total Past Due
Financing Receivable Recorded Investment Past Due [Line Items]
Total Loans	5	1
Other Loans | Consumer | Total Current
Financing Receivable Recorded Investment Past Due [Line Items]
Total Loans	$ 151	$ 172