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FAIR VALUE OF FINANCIAL INSTRUMENTS - Recurring basis (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020	Dec. 31, 2020
FAIR VALUE OF FINANCIAL INSTRUMENTS
Transfer of assets from level 1 to level 2	$ 0	$ 0	$ 0	$ 0
Transfer of assets from level 2 to level 1	0	0	0	0
Transfer of assets in to level 3	0	0	0	0
Transfer of assets out of level 3	0	0	0	0
Transfer of liabilities from level 1 to level 2	0	0	0	0
Transfer of liabilities from level 2 to level 1	0	0	0	0
Transfer of liabilities in to level 3	0	0	0	0
Transfer of liabilities out of level 3	0	$ 0	0	$ 0
Debt securities available-for-sale, at fair value	896,218		896,218		$ 922,869
Equity securities	3,366		3,366		3,292
Fair value	7,359		7,359		5,934
U.S. Treasury
FAIR VALUE OF FINANCIAL INSTRUMENTS
Debt securities available-for-sale, at fair value	60,295		60,295
U.S. government agency
FAIR VALUE OF FINANCIAL INSTRUMENTS
Debt securities available-for-sale, at fair value	129,693		129,693		121,993
Municipal securities
FAIR VALUE OF FINANCIAL INSTRUMENTS
Debt securities available-for-sale, at fair value	298,747		298,747		274,261
Mortgage-backed: Agency residential
FAIR VALUE OF FINANCIAL INSTRUMENTS
Debt securities available-for-sale, at fair value	175,112		175,112		203,252
Mortgage-backed: Agency commercial
FAIR VALUE OF FINANCIAL INSTRUMENTS
Debt securities available-for-sale, at fair value	165,901		165,901		250,766
Corporate
FAIR VALUE OF FINANCIAL INSTRUMENTS
Debt securities available-for-sale, at fair value	66,470		66,470		72,597
Level 1 \| U.S. Treasury
FAIR VALUE OF FINANCIAL INSTRUMENTS
Debt securities available-for-sale, at fair value	60,295		60,295
Recurring
FAIR VALUE OF FINANCIAL INSTRUMENTS
Equity securities	3,366		3,366		3,292
Fair value	7,359		7,359		5,934
Derivative financial assets fair value	9,526		9,526		15,360
Derivative financial liabilities fair value	10,505		10,505		16,818
Recurring \| U.S. government agency
FAIR VALUE OF FINANCIAL INSTRUMENTS
Debt securities available-for-sale, at fair value	129,693		129,693		121,993
Recurring \| Municipal securities
FAIR VALUE OF FINANCIAL INSTRUMENTS
Debt securities available-for-sale, at fair value	298,747		298,747		274,261
Recurring \| Mortgage-backed: Agency residential
FAIR VALUE OF FINANCIAL INSTRUMENTS
Debt securities available-for-sale, at fair value	175,112		175,112		203,252
Recurring \| Mortgage-backed: Agency commercial
FAIR VALUE OF FINANCIAL INSTRUMENTS
Debt securities available-for-sale, at fair value	165,901		165,901		250,766
Recurring \| Corporate
FAIR VALUE OF FINANCIAL INSTRUMENTS
Debt securities available-for-sale, at fair value	66,470		66,470		72,597
Recurring \| Level 1
FAIR VALUE OF FINANCIAL INSTRUMENTS
Equity securities	3,366		3,366		3,292
Recurring \| Level 2
FAIR VALUE OF FINANCIAL INSTRUMENTS
Derivative financial assets fair value	9,526		9,526		15,360
Derivative financial liabilities fair value	10,505		10,505		16,818
Recurring \| Level 2 \| U.S. government agency
FAIR VALUE OF FINANCIAL INSTRUMENTS
Debt securities available-for-sale, at fair value	129,693		129,693		121,993
Recurring \| Level 2 \| Municipal securities
FAIR VALUE OF FINANCIAL INSTRUMENTS
Debt securities available-for-sale, at fair value	298,747		298,747		274,261
Recurring \| Level 2 \| Mortgage-backed: Agency residential
FAIR VALUE OF FINANCIAL INSTRUMENTS
Debt securities available-for-sale, at fair value	175,112		175,112		203,252
Recurring \| Level 2 \| Mortgage-backed: Agency commercial
FAIR VALUE OF FINANCIAL INSTRUMENTS
Debt securities available-for-sale, at fair value	165,901		165,901		250,766
Recurring \| Level 2 \| Corporate
FAIR VALUE OF FINANCIAL INSTRUMENTS
Debt securities available-for-sale, at fair value	66,470		66,470		72,597
Recurring \| Level 3
FAIR VALUE OF FINANCIAL INSTRUMENTS
Fair value	$ 7,359		$ 7,359		$ 5,934