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FAIR VALUE OF FINANCIAL INSTRUMENTS - Recurring basis (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 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	836,267		836,267		$ 922,869
Equity securities	3,338		3,338		3,292
Fair value	7,319		7,319		5,934
U.S. Treasury
FAIR VALUE OF FINANCIAL INSTRUMENTS
Debt securities available-for-sale, at fair value	60,593		60,593
U.S. government agency
FAIR VALUE OF FINANCIAL INSTRUMENTS
Debt securities available-for-sale, at fair value	129,872		129,872		121,993
Municipal
FAIR VALUE OF FINANCIAL INSTRUMENTS
Debt securities available-for-sale, at fair value	291,251		291,251		274,261
Mortgage-backed: Agency residential
FAIR VALUE OF FINANCIAL INSTRUMENTS
Debt securities available-for-sale, at fair value	147,147		147,147		203,252
Mortgage-backed: Agency commercial
FAIR VALUE OF FINANCIAL INSTRUMENTS
Debt securities available-for-sale, at fair value	133,440		133,440		250,766
Corporate
FAIR VALUE OF FINANCIAL INSTRUMENTS
Debt securities available-for-sale, at fair value	73,964		73,964		72,597
Level 1 \| U.S. Treasury
FAIR VALUE OF FINANCIAL INSTRUMENTS
Debt securities available-for-sale, at fair value	60,593		60,593
Recurring
FAIR VALUE OF FINANCIAL INSTRUMENTS
Equity securities	3,338		3,338		3,292
Fair value	7,319		7,319		5,934
Derivative financial assets fair value	10,694		10,694		15,360
Derivative financial liabilities fair value	11,770		11,770		16,818
Recurring \| U.S. government agency
FAIR VALUE OF FINANCIAL INSTRUMENTS
Debt securities available-for-sale, at fair value	129,872		129,872		121,993
Recurring \| Municipal
FAIR VALUE OF FINANCIAL INSTRUMENTS
Debt securities available-for-sale, at fair value	291,251		291,251		274,261
Recurring \| Mortgage-backed: Agency residential
FAIR VALUE OF FINANCIAL INSTRUMENTS
Debt securities available-for-sale, at fair value	147,147		147,147		203,252
Recurring \| Mortgage-backed: Agency commercial
FAIR VALUE OF FINANCIAL INSTRUMENTS
Debt securities available-for-sale, at fair value	133,440		133,440		250,766
Recurring \| Corporate
FAIR VALUE OF FINANCIAL INSTRUMENTS
Debt securities available-for-sale, at fair value	73,964		73,964		72,597
Recurring \| Level 1
FAIR VALUE OF FINANCIAL INSTRUMENTS
Equity securities	3,338		3,338		3,292
Recurring \| Level 2
FAIR VALUE OF FINANCIAL INSTRUMENTS
Derivative financial assets fair value	10,694		10,694		15,360
Derivative financial liabilities fair value	11,770		11,770		16,818
Recurring \| Level 2 \| U.S. government agency
FAIR VALUE OF FINANCIAL INSTRUMENTS
Debt securities available-for-sale, at fair value	129,872		129,872		121,993
Recurring \| Level 2 \| Municipal
FAIR VALUE OF FINANCIAL INSTRUMENTS
Debt securities available-for-sale, at fair value	291,251		291,251		274,261
Recurring \| Level 2 \| Mortgage-backed: Agency residential
FAIR VALUE OF FINANCIAL INSTRUMENTS
Debt securities available-for-sale, at fair value	147,147		147,147		203,252
Recurring \| Level 2 \| Mortgage-backed: Agency commercial
FAIR VALUE OF FINANCIAL INSTRUMENTS
Debt securities available-for-sale, at fair value	133,440		133,440		250,766
Recurring \| Level 2 \| Corporate
FAIR VALUE OF FINANCIAL INSTRUMENTS
Debt securities available-for-sale, at fair value	73,964		73,964		72,597
Recurring \| Level 3
FAIR VALUE OF FINANCIAL INSTRUMENTS
Fair value	$ 7,319		$ 7,319		$ 5,934