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Loans - Non-performing Loans (Details) - USD ($) $ in Thousands | Sep. 30, 2021 | Dec. 31, 2020
--- | --- | ---
Loans ninety days or more past due and still accruing | $ 1,925 | $ 2,748
Multi-family Residential Portfolio Segment [Member] |  |
Loans ninety days or more past due and still accruing |  | 201
Commercial Real Estate |  |
Loans ninety days or more past due and still accruing |  | 2,547
Commercial Business and Other Portfolio Segment [Member] |  |
Loans ninety days or more past due and still accruing | 1,052 |
Performing Financial Instruments [Member] | One-To-Four Family - Mixed-Use Property Portfolio Segment [Member] |  |
Non-accrual loans | $ 300 | 300
Performing Financial Instruments [Member] | Taxi Medallion Portfolio Segment [Member] |  |
Non-accrual loans |  | 400
Performing Financial Instruments [Member] | Commercial Business and Other Portfolio Segment [Member] |  |
Non-accrual loans |  | $ 2,200

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