Loans - Amortized Cost of Collateral (Details) - USD ($) $ in Thousands	Mar. 31, 2023	Dec. 31, 2022
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	$ 6,904,176
Real Estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	12,021	$ 11,652
Business Assets
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	8,934	18,290
Multi-family Residential Portfolio Segment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	2,604,174
Multi-family Residential Portfolio Segment [Member] | Real Estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	3,975	3,547
Commercial Real Estate [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	1,905,707
Commercial Real Estate [Member] | Real Estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total		254
One-To-Four Family - Mixed-Use Property Portfolio Segment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	551,971
One-To-Four Family - Mixed-Use Property Portfolio Segment [Member] | Real Estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	797	1,045
One-To-Four Family - Residential Portfolio Segment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	239,585
One-To-Four Family - Residential Portfolio Segment [Member] | Real Estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	4,396	3,953
Construction Portfolio Segment
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	60,373
Small Business Administration Portfolio Segment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	22,760
Small Business Administration Portfolio Segment [Member] | Business Assets
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	949	950
Commercial Business and Other Portfolio Segment [Member] | Real Estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	2,853	2,853
Commercial Business and Other Portfolio Segment [Member] | Business Assets
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	$ 7,985	$ 17,340