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Loans and Allowance for Loan Losses - Troubled Debt Restructurings That Are Not Performing (Details) $ in Thousands | 12 Months Ended
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Dec. 31, 2019 USD ($) | Dec. 31, 2018 USD ($)
Number of contracts | 0 |
Nonperforming Financial Instruments [Member] |  |
Number of contracts | 5 | 2
Recorded investment, not performing | $ 1,344 | $ 1,785
Multi-family Residential Portfolio Segment [Member] | Nonperforming Financial Instruments [Member] |  |
Number of contracts | 0 | 1
Recorded investment, not performing | $ 0 | $ 388
Taxi Medallion Portfolio Segment [Member] | Nonperforming Financial Instruments [Member] |  |
Number of contracts | 4 | 0
Recorded investment, not performing | $ 1,065 | $ 0
Commercial Business and Other Portfolio Segment [Member] | Nonperforming Financial Instruments [Member] |  |
Number of contracts | 1 | 1
Recorded investment, not performing | $ 279 | $ 1,397

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