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Loans - Non-Accrual at Amortized Cost (Details) - USD ($) $ in Thousands | 9 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Sep. 30, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Total Non-accrual amortized cost | $ 18,611 | $ 20,947 | $ 28,026
Non-Accrual with no related Allowance | 16,986 | 16,880 |
Interest income recognized | 87 | 58 |
Loans ninety days or more past due and still accruing: | 1,925 | 2,748 |
Multi-family Residential Portfolio Segment [Member] |  |  |
Total Non-accrual amortized cost | 4,461 | 2,576 | 2,723
Non-Accrual with no related Allowance | 4,461 | 2,576 |
Interest income recognized | 19 |  |
Loans ninety days or more past due and still accruing: |  | 201 |
Commercial Real Estate |  |  |
Total Non-accrual amortized cost | 640 | 1,766 | 2,714
Non-Accrual with no related Allowance | 640 | 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 | 2,510 | 1,706 | 1,704
Non-Accrual with no related Allowance | 2,510 | 1,706 |
Interest income recognized | 4 |  |
One-To-Four Family - Residential Portfolio Segment [Member] |  |  |
Total Non-accrual amortized cost | 7,509 | 5,313 | 9,992
Non-Accrual with no related Allowance | 7,509 | 5,313 |
Interest income recognized | 1 |  |
Construction Portfolio Segment [Member] |  |  |
Loans ninety days or more past due and still accruing: | 873 |  |
Small Business Administration Portfolio Segment [Member] |  |  |
Total Non-accrual amortized cost | 991 | 1,168 | 1,169
Non-Accrual with no related Allowance | 991 | 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 | 2,500 | 5,660 | $ 7,406
Non-Accrual with no related Allowance | 875 | 1,593 |
Interest income recognized | 63 | $ 58 |
Loans ninety days or more past due and still accruing: | $ 1,052 |  |

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