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Loans and Allowance for Loan Losses - Non-Accrual at Amortized Cost (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Mar. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Total Non-accrual amortized cost | $ 20,823 | $ 20,947 | $ 28,026
Non-Accrual with no related Allowance | 16,806 | 16,880 |
Interest income recognized | 48 | 58 |
Loans ninety days or more past due and still accruing: | 2,582 | 2,748 |
Multi-family Residential Portfolio Segment [Member] |  |  |
Total Non-accrual amortized cost | 4,435 | 2,576 | 2,723
Non-Accrual with no related Allowance | 4,435 | 2,576 |
Loans ninety days or more past due and still accruing: | 201 | 201 |
Commercial Real Estate |  |  |
Total Non-accrual amortized cost | 35 | 1,766 | 2,714
Non-Accrual with no related Allowance | 35 | 1,766 |
Loans ninety days or more past due and still accruing: |  | 2,547 |
One-To-Four Family - Mixed-Use Property Portfolio Segment [Member] |  |  |
Total Non-accrual amortized cost | 2,753 | 1,706 | 1,704
Non-Accrual with no related Allowance | 2,753 | 1,706 |
One-To-Four Family - Residential Portfolio Segment [Member] |  |  |
Total Non-accrual amortized cost | 6,789 | 5,313 | 9,992
Non-Accrual with no related Allowance | 6,789 | 5,313 |
Construction Portfolio Segment [Member] |  |  |
Loans ninety days or more past due and still accruing: | 2,381 |  |
Small Business Administration Portfolio Segment [Member] |  |  |
Total Non-accrual amortized cost | 1,168 | 1,168 | 1,169
Non-Accrual with no related Allowance | 1,168 | 1,168 |
Taxi Medallion Portfolio Segment [Member] |  |  |
Total Non-accrual amortized cost |  | 2,758 | 2,318
Non-Accrual with no related Allowance |  | 2,758 |
Commercial Business and Other Portfolio Segment [Member] |  |  |
Total Non-accrual amortized cost | 5,643 | 5,660 | $ 7,406
Non-Accrual with no related Allowance | 1,626 | 1,593 |
Interest income recognized | $ 48 | $ 58 |

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