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DERIVATIVES (Cash flow hedges included in the Consolidated Statement of Financial Condition) (Details) - Interest rate swaps related to subordinated debt [Member] - USD ($) $ in Thousands | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2021 | Dec. 31, 2020
Derivatives, Fair Value [Line Items] |  |
Notional Amount | $ 30,000 | $ 30,000
Fair Value | $ 1,952 | $ 574
Weighted average rate paid (fixed) | 2.50% |
Weighted average maturity years | 8 years 9 months 18 days | 9 years 6 months
LIBOR plus a weighted average margin | 1.83% |

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