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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

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