Loans - Non-Accrual at Amortized Cost (Details) - USD ($) $ in Thousands	9 Months Ended	12 Months Ended
	Sep. 30, 2023	Dec. 31, 2022
Financing Receivable, Excluding Accrued Interest, Nonaccrual
Non-accrual amortized cost beginning of the reporting period	$ 29,942	$ 15,254
Non-accrual amortized cost end of the reporting period	17,278	29,942
Non-accrual with no related allowance	13,344	13,040
Interest income recognized	20	171
Loans ninety days or more past due and still accruing		2,600
Multi-family Residential Portfolio Segment [Member]
Financing Receivable, Excluding Accrued Interest, Nonaccrual
Non-accrual amortized cost beginning of the reporting period	3,547	2,652
Non-accrual amortized cost end of the reporting period	3,600	3,547
Non-accrual with no related allowance	3,600	3,547
Interest income recognized	2
Commercial Real Estate [Member]
Financing Receivable, Excluding Accrued Interest, Nonaccrual
Non-accrual amortized cost beginning of the reporting period	254	640
Non-accrual amortized cost end of the reporting period		254
Non-accrual with no related allowance		254
One-To-Four Family - Mixed-Use Property Portfolio Segment [Member]
Financing Receivable, Excluding Accrued Interest, Nonaccrual
Non-accrual amortized cost beginning of the reporting period	1,045	1,582
Non-accrual amortized cost end of the reporting period	1,090	1,045
Non-accrual with no related allowance	1,090	1,045
Interest income recognized	2
One-To-Four Family - Mixed-Use Property Portfolio Segment [Member] | Performing Financial Instruments [Member]
Non-accrual loans		200
One-To-Four Family - Residential Portfolio Segment [Member]
Financing Receivable, Excluding Accrued Interest, Nonaccrual
Non-accrual amortized cost beginning of the reporting period	3,953	7,483
Non-accrual amortized cost end of the reporting period	3,643	3,953
Non-accrual with no related allowance	3,643	3,953
Construction Portfolio Segment
Financing Receivable, Excluding Accrued Interest, Nonaccrual
Loans ninety days or more past due and still accruing		2,600
Small Business Administration Portfolio Segment [Member]
Financing Receivable, Excluding Accrued Interest, Nonaccrual
Non-accrual amortized cost beginning of the reporting period	950	952
Non-accrual amortized cost end of the reporting period	1,265	950
Non-accrual with no related allowance	1,265	950
Commercial Business and Other Portfolio Segment [Member]
Financing Receivable, Excluding Accrued Interest, Nonaccrual
Non-accrual amortized cost beginning of the reporting period	20,193	1,945
Non-accrual amortized cost end of the reporting period	7,680	20,193
Non-accrual with no related allowance	3,746	3,291
Interest income recognized	$ 16	171
Commercial Business and Other Portfolio Segment [Member] | Performing Financial Instruments [Member]
Non-accrual loans		$ 100