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Loans and Allowance for Loan Losses (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019
Aggregate outstanding loans | $ 6,704,674 | $ 5,772,206
Non-accrual loans |  | $ 12,813
Servicing Mortgage Loans [Member] |  |
Servicing Asset, Loans Serviced, Amount | 62,000 |
Commercial Real Estate |  |
Aggregate outstanding loans | 1,758,384 |
Multi-family Residential Portfolio Segment [Member] |  |
Aggregate outstanding loans | $ 2,535,977 |
Multi-family Residential Property and Commercial Real Estate and Commercial Business and Other Loans [Member] |  |
Loan Origination, Underwriting Requirements, Minimum Debt Service Coverage | 125.00% |
Loan Origination, Value, Maximum Percentage | 75.00% |
Multi-family Residential Property and Commercial Real Estate and Commercial Business and Other Loans [Member] | Gross Loans [Member] | Credit Concentration Risk [Member] |  |
Concentration Risk, Percentage | 83.40% | 84.80%
Taxi Medallion Portfolio Segment [Member] |  |
Aggregate outstanding loans | $ 2,597 |
Taxi Medallion Portfolio Segment [Member] | Performing Financial Instruments [Member] |  |
Non-accrual loans | 1,700 |
Taxi Medallion Portfolio Segment [Member] | Performing Financial Instruments [Member] |  |
Non-accrual loans | 400 |
Commercial Business and Other Portfolio Segment [Member] |  |
Aggregate outstanding loans | 1,299,409 |
Commercial Business and Other Portfolio Segment [Member] | Performing Financial Instruments [Member] |  |
Non-accrual loans | 900 |
Commercial Business and Other Portfolio Segment [Member] | Performing Financial Instruments [Member] |  |
Non-accrual loans | $ 2,200 |

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