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Loans and Allowance for Loan Losses - Troubled Debt Restructurings That Are Performing (Details) | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2020 USD ($) contract | Sep. 30, 2019 loan | Dec. 31, 2019 USD ($) contract
Number | 1 | 3 |
Performing Financial Instruments [Member] |  |  |
Number | contract | 19 |  | 24
Amortized Cost | $ 5,182,000 |  |
Recorded investment |  |  | $ 6,494,000
Multi-Family Residential [Member] | Performing Financial Instruments [Member] |  |  |
Number | contract | 7 |  | 7
Amortized Cost | $ 1,876,000 |  |
Recorded investment |  |  | $ 1,873,000
One-To-Four Family - Mixed Used Property [Member] |  |  |
Number | 1 |  |
One-To-Four Family - Mixed Used Property [Member] | Performing Financial Instruments [Member] |  |  |
Number | contract | 5 |  | 4
Amortized Cost | $ 1,744,000 |  |
Recorded investment |  |  | $ 1,481,000
One-To-Four Family - Residential [Member] | Performing Financial Instruments [Member] |  |  |
Number | contract | 3 |  | 3
Amortized Cost | $ 513,000 |  |
Recorded investment |  |  | $ 531,000
Taxi Medallion Portfolio Segment [Member] | Performing Financial Instruments [Member] |  |  |
Number | contract | 1 |  | 7
Amortized Cost | $ 99,000 |  |
Recorded investment |  |  | $ 1,668,000
Commercial Business and Other [Member] |  |  |
Number | loan |  | 3 |
Commercial Business and Other [Member] | Performing Financial Instruments [Member] |  |  |
Number | contract | 3 |  | 3
Amortized Cost | $ 950,000 |  |
Recorded investment |  |  | $ 941,000

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