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Loans and Allowance for Loan Losses - Troubled Debt Restructurings That Are Performing (Details) $ in Thousands | 12 Months Ended
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Dec. 31, 2020 USD ($) contract | Dec. 31, 2019 USD ($) | Dec. 31, 2018
Number | 2 | 3 | 1
Performing Financial Instruments [Member] |  |  |
Number | 25 | 24 |
Amortized Cost | $ 15,911 |  |
Recorded investment |  | $ 6,494 |
Multi-Family Residential [Member] | Performing Financial Instruments [Member] |  |  |
Number | 6 | 7 |
Amortized Cost | $ 1,700 |  |
Recorded investment |  | $ 1,873 |
Commercial Real Estate |  |  |
Number | 1 |  |
Commercial Real Estate | Performing Financial Instruments [Member] |  |  |
Number | contract | 1 |  |
Amortized Cost | $ 7,702 |  |
One-To-Four Family - Mixed Used Property [Member] |  |  |
Number | 1 |  |
One-To-Four Family - Mixed Used Property [Member] | Performing Financial Instruments [Member] |  |  |
Number | 5 | 4 |
Amortized Cost | $ 1,731 |  |
Recorded investment |  | $ 1,481 |
One-To-Four Family - Residential [Member] | Performing Financial Instruments [Member] |  |  |
Number | 3 | 3 |
Amortized Cost | $ 507 |  |
Recorded investment |  | $ 531 |
Taxi Medallion Portfolio Segment [Member] | Performing Financial Instruments [Member] |  |  |
Number | 2 | 7 |
Amortized Cost | $ 440 |  |
Recorded investment |  | $ 1,668 |
Commercial Business and Other [Member] | Performing Financial Instruments [Member] |  |  |
Number | 8 | 3 |
Amortized Cost | $ 3,831 |  |
Recorded investment |  | $ 941 |

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