Loans - Amortized Cost of Collateral (Details) - USD ($) $ in Thousands	Sep. 30, 2023	Dec. 31, 2022
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans	$ 6,906,713	$ 6,934,769
Basis adjustments	10,639
Portfolio Layer Hedges on Closed Portfolio of Loans [Member] | Designated as Hedging Instrument [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Basis adjustments	10,600
Real Estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans	8,333	11,652
Business Assets
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans	8,945	18,290
Multi-family Residential Portfolio Segment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans	2,617,629	2,605,172
Multi-family Residential Portfolio Segment [Member] | Real Estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans	3,600	3,547
Commercial Real Estate [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans	1,954,462	1,914,898
Commercial Real Estate [Member] | Real Estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans		254
One-To-Four Family - Mixed-Use Property Portfolio Segment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans	540,519	557,295
One-To-Four Family - Mixed-Use Property Portfolio Segment [Member] | Real Estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans	1,090	1,045
One-To-Four Family - Residential Portfolio Segment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans	224,127	242,480
One-To-Four Family - Residential Portfolio Segment [Member] | Real Estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans	3,643	3,953
Construction Portfolio Segment
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans	59,775	70,824
Small Business Administration Portfolio Segment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans	21,836	23,193
Small Business Administration Portfolio Segment [Member] | Business Assets
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans	1,265	950
Commercial Business and Other Portfolio Segment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans	1,488,365	1,520,907
Commercial Business and Other Portfolio Segment [Member] | Real Estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans		2,853
Commercial Business and Other Portfolio Segment [Member] | Business Assets
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans	$ 7,680	$ 17,340