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FAIR VALUE OF FINANCIAL INSTRUMENTS - Recurring basis (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019	Dec. 31, 2019
FAIR VALUE OF FINANCIAL INSTRUMENTS
Transfer of assets from level 1 to level 2	$ 0	$ 0
Transfer of assets from level 2 to level 1	0	0
Transfer of assets in to level 3	0	0
Transfer of assets out of level 3	0	0
Transfer of liabilities from level 1 to level 2	0	0
Transfer of liabilities from level 2 to level 1	0	$ 0
Debt securities available-for-sale, at fair value	615,565		$ 592,404
Equity securities	3,207		3,241
Fair value	6,347		8,518
U.S. government agency
FAIR VALUE OF FINANCIAL INSTRUMENTS
Debt securities available-for-sale, at fair value	51,175		49,615
Municipal securities
FAIR VALUE OF FINANCIAL INSTRUMENTS
Debt securities available-for-sale, at fair value	168,245		133,738
Mortgage-backed: Agency residential
FAIR VALUE OF FINANCIAL INSTRUMENTS
Debt securities available-for-sale, at fair value	188,618		200,678
Mortgage-backed: Agency commercial
FAIR VALUE OF FINANCIAL INSTRUMENTS
Debt securities available-for-sale, at fair value	132,517		134,954
Corporate
FAIR VALUE OF FINANCIAL INSTRUMENTS
Debt securities available-for-sale, at fair value	75,010		73,419
Recurring
FAIR VALUE OF FINANCIAL INSTRUMENTS
Equity securities	3,207		3,241
Fair value	6,347		8,518
Derivative financial assets fair value	21,946		8,642
Derivative financial liabilities fair value	23,558		9,318
Recurring \| U.S. government agency
FAIR VALUE OF FINANCIAL INSTRUMENTS
Debt securities available-for-sale, at fair value	51,175		49,615
Recurring \| Municipal securities
FAIR VALUE OF FINANCIAL INSTRUMENTS
Debt securities available-for-sale, at fair value	168,245		133,738
Recurring \| Mortgage-backed: Agency residential
FAIR VALUE OF FINANCIAL INSTRUMENTS
Debt securities available-for-sale, at fair value	188,618		200,678
Recurring \| Mortgage-backed: Agency commercial
FAIR VALUE OF FINANCIAL INSTRUMENTS
Debt securities available-for-sale, at fair value	132,517		134,954
Recurring \| Corporate
FAIR VALUE OF FINANCIAL INSTRUMENTS
Debt securities available-for-sale, at fair value	75,010		73,419
Recurring \| Level 1
FAIR VALUE OF FINANCIAL INSTRUMENTS
Equity securities	3,207		3,241
Recurring \| Level 2
FAIR VALUE OF FINANCIAL INSTRUMENTS
Derivative financial assets fair value	21,946		8,642
Derivative financial liabilities fair value	23,558		9,318
Recurring \| Level 2 \| U.S. government agency
FAIR VALUE OF FINANCIAL INSTRUMENTS
Debt securities available-for-sale, at fair value	51,175		49,615
Recurring \| Level 2 \| Municipal securities
FAIR VALUE OF FINANCIAL INSTRUMENTS
Debt securities available-for-sale, at fair value	168,245		133,738
Recurring \| Level 2 \| Mortgage-backed: Agency residential
FAIR VALUE OF FINANCIAL INSTRUMENTS
Debt securities available-for-sale, at fair value	188,618		200,678
Recurring \| Level 2 \| Mortgage-backed: Agency commercial
FAIR VALUE OF FINANCIAL INSTRUMENTS
Debt securities available-for-sale, at fair value	132,517		134,954
Recurring \| Level 2 \| Corporate
FAIR VALUE OF FINANCIAL INSTRUMENTS
Debt securities available-for-sale, at fair value	75,010		73,419
Recurring \| Level 3
FAIR VALUE OF FINANCIAL INSTRUMENTS
Fair value	$ 6,347		$ 8,518