FAIR VALUE OF FINANCIAL INSTRUMENTS - Recurring basis (Details) - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2019	Dec. 31, 2018
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
Transfer of liabilities in to level 3	0	0
Transfer of liabilities out of level 3	0	0
Securities available-for-sale, at fair value	592,404	679,526
Equity securities	3,241	3,081
Fair value	8,518	10,918
U.S. government agency
FAIR VALUE OF FINANCIAL INSTRUMENTS
Securities available-for-sale, at fair value	49,615	46,866
Municipal securities
FAIR VALUE OF FINANCIAL INSTRUMENTS
Securities available-for-sale, at fair value	133,738	161,450
Mortgage-backed: Agency residential
FAIR VALUE OF FINANCIAL INSTRUMENTS
Securities available-for-sale, at fair value	200,678	234,303
Mortgage-backed: Agency commercial
FAIR VALUE OF FINANCIAL INSTRUMENTS
Securities available-for-sale, at fair value	134,954	150,081
Mortgage-backed: Private-label
FAIR VALUE OF FINANCIAL INSTRUMENTS
Securities available-for-sale, at fair value		256
Corporate
FAIR VALUE OF FINANCIAL INSTRUMENTS
Securities available-for-sale, at fair value	73,419	86,570
Recurring
FAIR VALUE OF FINANCIAL INSTRUMENTS
Equity securities	3,241	3,081
Fair value	8,518	10,918
Derivative financial assets	8,642	3,225
Derivative financial liabilities	9,318	3,074
Recurring \| U.S. government agency
FAIR VALUE OF FINANCIAL INSTRUMENTS
Securities available-for-sale, at fair value	49,615	46,866
Recurring \| Municipal securities
FAIR VALUE OF FINANCIAL INSTRUMENTS
Securities available-for-sale, at fair value	133,738	161,450
Recurring \| Mortgage-backed: Agency residential
FAIR VALUE OF FINANCIAL INSTRUMENTS
Securities available-for-sale, at fair value	200,678	234,303
Recurring \| Mortgage-backed: Agency commercial
FAIR VALUE OF FINANCIAL INSTRUMENTS
Securities available-for-sale, at fair value	134,954	150,081
Recurring \| Mortgage-backed: Private-label
FAIR VALUE OF FINANCIAL INSTRUMENTS
Securities available-for-sale, at fair value		256
Recurring \| Corporate
FAIR VALUE OF FINANCIAL INSTRUMENTS
Securities available-for-sale, at fair value	73,419	86,570
Recurring \| Level 1
FAIR VALUE OF FINANCIAL INSTRUMENTS
Equity securities	3,241	3,081
Recurring \| Level 2
FAIR VALUE OF FINANCIAL INSTRUMENTS
Derivative financial assets	8,642	3,225
Derivative financial liabilities	9,318	3,074
Recurring \| Level 2 \| U.S. government agency
FAIR VALUE OF FINANCIAL INSTRUMENTS
Securities available-for-sale, at fair value	49,615	46,866
Recurring \| Level 2 \| Municipal securities
FAIR VALUE OF FINANCIAL INSTRUMENTS
Securities available-for-sale, at fair value	133,738	161,450
Recurring \| Level 2 \| Mortgage-backed: Agency residential
FAIR VALUE OF FINANCIAL INSTRUMENTS
Securities available-for-sale, at fair value	200,678	234,303
Recurring \| Level 2 \| Mortgage-backed: Agency commercial
FAIR VALUE OF FINANCIAL INSTRUMENTS
Securities available-for-sale, at fair value	134,954	150,081
Recurring \| Level 2 \| Mortgage-backed: Private-label
FAIR VALUE OF FINANCIAL INSTRUMENTS
Securities available-for-sale, at fair value		256
Recurring \| Level 2 \| Corporate
FAIR VALUE OF FINANCIAL INSTRUMENTS
Securities available-for-sale, at fair value	73,419	86,570
Recurring \| Level 3
FAIR VALUE OF FINANCIAL INSTRUMENTS
Fair value	$ 8,518	$ 10,918

Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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Amount of transfers of financial instrument classified as a liability into level 3 of the fair value hierarchy.

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Fair value of an asset representing net future revenue from contractually specified servicing fees, late charges, and other ancillary revenues, in excess of future costs related to servicing arrangements.

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