Loans, Allowance for Credit Losses and Credit Quality - Schedule of Information Regarding Past Due Loans (Details) - USD ($) $ in Thousands	Sep. 30, 2024	Dec. 31, 2023
Financing Receivable Recorded Investment Past Due [Line Items]
Total Loans	$ 1,124,491	$ 1,048,606
90 days or more past due and accruing	0	0
Loans on Non-accrual	1,098	1,213
30–59 Days
Financing Receivable Recorded Investment Past Due [Line Items]
Total Loans	1,766	1,083
60–89 Days
Financing Receivable Recorded Investment Past Due [Line Items]
Total Loans	259	225
90 Days or More
Financing Receivable Recorded Investment Past Due [Line Items]
Total Loans	0	817
Total Past Due
Financing Receivable Recorded Investment Past Due [Line Items]
Total Loans	2,025	2,125
Total Current
Financing Receivable Recorded Investment Past Due [Line Items]
Total Loans	1,122,466	1,046,481
Real Estate Loans | Home Equity Lines of Credit and Loans
Financing Receivable Recorded Investment Past Due [Line Items]
Total Loans	39,413	33,357
90 days or more past due and accruing	0	0
Loans on Non-accrual	85	22
Real Estate Loans | 30–59 Days | Home Equity Lines of Credit and Loans
Financing Receivable Recorded Investment Past Due [Line Items]
Total Loans	220	360
Real Estate Loans | 60–89 Days | Home Equity Lines of Credit and Loans
Financing Receivable Recorded Investment Past Due [Line Items]
Total Loans	258	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	0	8
Real Estate Loans | Total Past Due | Home Equity Lines of Credit and Loans
Financing Receivable Recorded Investment Past Due [Line Items]
Total Loans	478	368
Real Estate Loans | Total Current | Home Equity Lines of Credit and Loans
Financing Receivable Recorded Investment Past Due [Line Items]
Total Loans	38,935	32,989
Real Estate Loans | One- to Four-Family Residential
Financing Receivable Recorded Investment Past Due [Line Items]
Total Loans	419,373	410,131
90 days or more past due and accruing	0	0
Loans on Non-accrual	1,012	1,191
Real Estate Loans | One- to Four-Family Residential | 30–59 Days
Financing Receivable Recorded Investment Past Due [Line Items]
Total Loans	1,545	722
Real Estate Loans | One- to Four-Family Residential | 60–89 Days
Financing Receivable Recorded Investment Past Due [Line Items]
Total Loans	0	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	1,545	1,756
Real Estate Loans | One- to Four-Family Residential | Total Current
Financing Receivable Recorded Investment Past Due [Line Items]
Total Loans	417,828	408,375
Real Estate Loans | Multi Family
Financing Receivable Recorded Investment Past Due [Line Items]
Total Loans	326,975	287,361
90 days or more past due 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	326,975	287,361
Real Estate Loans | Commercial Real Estate Loans
Financing Receivable Recorded Investment Past Due [Line Items]
Total Loans	222,680	196,365
90 days or more past due 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	222,680	196,365
Real Estate Loans | Construction
Financing Receivable Recorded Investment Past Due [Line Items]
Total Loans	101,401	112,000
90 days or more past due 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	101,401	112,000
Other Loans | Commercial
Financing Receivable Recorded Investment Past Due [Line Items]
Total Loans	14,508	9,219
90 days or more past due and accruing	0	0
Loans on Non-accrual	0	0
Other Loans | Commercial | 30–59 Days
Financing Receivable Recorded Investment Past Due [Line Items]
Total Loans	0	0
Other Loans | Commercial | 60–89 Days
Financing Receivable Recorded Investment Past Due [Line Items]
Total Loans	0	0
Other Loans | Commercial | 90 Days or More
Financing Receivable Recorded Investment Past Due [Line Items]
Total Loans	0	0
Other Loans | Commercial | Total Past Due
Financing Receivable Recorded Investment Past Due [Line Items]
Total Loans	0	0
Other Loans | Commercial | Total Current
Financing Receivable Recorded Investment Past Due [Line Items]
Total Loans	14,508	9,219
Other Loans | Consumer
Financing Receivable Recorded Investment Past Due [Line Items]
Total Loans	141	173
90 days or more past due and accruing	0	0
Loans on Non-accrual	1	0
Other Loans | Consumer | 30–59 Days
Financing Receivable Recorded Investment Past Due [Line Items]
Total Loans	1	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	2	1
Other Loans | Consumer | Total Current
Financing Receivable Recorded Investment Past Due [Line Items]
Total Loans	$ 139	$ 172