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FAIR VALUE OF FINANCIAL INSTRUMENTS - Recurring basis (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018	Dec. 31, 2018
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
Securities available-for-sale, at fair value	618,120		618,120		$ 679,526
Equity securities	3,251		3,251		3,081
Fair value	7,936		7,936		10,918
U.S. government agency
FAIR VALUE OF FINANCIAL INSTRUMENTS
Securities available-for-sale, at fair value	39,574		39,574		46,866
Municipal securities
FAIR VALUE OF FINANCIAL INSTRUMENTS
Securities available-for-sale, at fair value	152,499		152,499		161,450
Mortgage-backed: Agency residential
FAIR VALUE OF FINANCIAL INSTRUMENTS
Securities available-for-sale, at fair value	218,246		218,246		234,303
Mortgage-backed: Agency commercial
FAIR VALUE OF FINANCIAL INSTRUMENTS
Securities available-for-sale, at fair value	129,449		129,449		150,081
Mortgage-backed: Private-label
FAIR VALUE OF FINANCIAL INSTRUMENTS
Securities available-for-sale, at fair value	22		22		256
Corporate
FAIR VALUE OF FINANCIAL INSTRUMENTS
Securities available-for-sale, at fair value	78,330		78,330		86,570
Recurring
FAIR VALUE OF FINANCIAL INSTRUMENTS
Equity securities	3,251		3,251		3,081
Fair value	7,936		7,936		10,918
Derivative financial assets	11,766		11,766		3,225
Derivative financial liabilities	12,664		12,664		3,074
Recurring \| U.S. government agency
FAIR VALUE OF FINANCIAL INSTRUMENTS
Securities available-for-sale, at fair value	39,574		39,574		46,866
Recurring \| Municipal securities
FAIR VALUE OF FINANCIAL INSTRUMENTS
Securities available-for-sale, at fair value	152,499		152,499		161,450
Recurring \| Mortgage-backed: Agency residential
FAIR VALUE OF FINANCIAL INSTRUMENTS
Securities available-for-sale, at fair value	218,246		218,246		234,303
Recurring \| Mortgage-backed: Agency commercial
FAIR VALUE OF FINANCIAL INSTRUMENTS
Securities available-for-sale, at fair value	129,449		129,449		150,081
Recurring \| Mortgage-backed: Private-label
FAIR VALUE OF FINANCIAL INSTRUMENTS
Securities available-for-sale, at fair value	22		22		256
Recurring \| Corporate
FAIR VALUE OF FINANCIAL INSTRUMENTS
Securities available-for-sale, at fair value	78,330		78,330		86,570
Recurring \| Level 1
FAIR VALUE OF FINANCIAL INSTRUMENTS
Equity securities	3,251		3,251		3,081
Recurring \| Level 2
FAIR VALUE OF FINANCIAL INSTRUMENTS
Derivative financial assets	11,766		11,766		3,225
Derivative financial liabilities	12,664		12,664		3,074
Recurring \| Level 2 \| U.S. government agency
FAIR VALUE OF FINANCIAL INSTRUMENTS
Securities available-for-sale, at fair value	39,574		39,574		46,866
Recurring \| Level 2 \| Municipal securities
FAIR VALUE OF FINANCIAL INSTRUMENTS
Securities available-for-sale, at fair value	152,499		152,499		161,450
Recurring \| Level 2 \| Mortgage-backed: Agency residential
FAIR VALUE OF FINANCIAL INSTRUMENTS
Securities available-for-sale, at fair value	218,246		218,246		234,303
Recurring \| Level 2 \| Mortgage-backed: Agency commercial
FAIR VALUE OF FINANCIAL INSTRUMENTS
Securities available-for-sale, at fair value	129,449		129,449		150,081
Recurring \| Level 2 \| Mortgage-backed: Private-label
FAIR VALUE OF FINANCIAL INSTRUMENTS
Securities available-for-sale, at fair value	22		22		256
Recurring \| Level 2 \| Corporate
FAIR VALUE OF FINANCIAL INSTRUMENTS
Securities available-for-sale, at fair value	78,330		78,330		86,570
Recurring \| Level 3
FAIR VALUE OF FINANCIAL INSTRUMENTS
Fair value	$ 7,936		$ 7,936		$ 10,918