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Loans - Composition of Loans (Details) - USD ($) $ in Thousands | Sep. 30, 2023 | Dec. 31, 2022
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Loans: |  |
Net unamortized premiums and unearned loan fees | $ 9,059 | $ 9,011
Total loans, net of fees and costs excluding portfolio layer basis adjustments | 6,906,713 | 6,934,769
Unallocated portfolio layer basis adjustments | (10,639) |
Total loans, net of fees and costs | 6,896,074 | 6,934,769
Multi-Family Residential |  |
Loans: |  |
Loans before allowance for credit losses, fee and costs | 2,614,219 | 2,601,384
Commercial Real Estate |  |
Loans: |  |
Loans before allowance for credit losses, fee and costs | 1,953,243 | 1,913,040
One-To-Four Family - Mixed Used Property |  |
Loans: |  |
Loans before allowance for credit losses, fee and costs | 537,744 | 554,314
One-To-Four Family - Residential |  |
Loans: |  |
Loans before allowance for credit losses, fee and costs | 222,874 | 241,246
Construction Portfolio Segment |  |
Loans: |  |
Loans before allowance for credit losses, fee and costs | 59,903 | 70,951
Total loans, net of fees and costs excluding portfolio layer basis adjustments | 59,775 | 70,824
Small Business Administration |  |
Loans: |  |
Loans before allowance for credit losses, fee and costs | 21,896 | 23,275
Commercial Business and Other |  |
Loans: |  |
Loans before allowance for credit losses, fee and costs | $ 1,487,775 | $ 1,521,548

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