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%