LOANS AND ALLOWANCE - Activity in the allowance for loan losses - (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Allowance for loan losses
Balance at the beginning of the period	$ 22,306	$ 21,468	$ 22,499	$ 22,020
Provision charged to expense	600	150	700	855
Losses charged off	(1,321)	(1,209)	(4,479)	(4,979)
Recoveries	958	1,419	3,823	3,932
Balance at the end of the period	22,543	21,828	22,543	21,828
Commercial
Allowance for loan losses
Balance at the beginning of the period	9,348	6,940	9,654	6,511
Provision charged to expense	801	1,525	664	2,352
Losses charged off	(27)	(23)	(624)	(650)
Recoveries	26	148	454	377
Balance at the end of the period	10,148	8,590	10,148	8,590
Commercial real estate
Allowance for loan losses
Balance at the beginning of the period	7,866	8,780	7,706	10,702
Provision charged to expense	(278)	(1,225)	(527)	(3,314)
Losses charged off	(99)	(33)	(556)	(614)
Recoveries	121	398	987	1,146
Balance at the end of the period	7,610	7,920	7,610	7,920
Residential
Allowance for loan losses
Balance at the beginning of the period	4,021	4,677	4,247	3,859
Provision charged to expense	(58)	(257)	(47)	1,214
Losses charged off	(286)	(122)	(739)	(967)
Recoveries	111	106	327	298
Balance at the end of the period	3,788	4,404	3,788	4,404
Consumer
Allowance for loan losses
Balance at the beginning of the period	1,071	1,071	892	948
Provision charged to expense	135	107	610	603
Losses charged off	(909)	(1,031)	(2,560)	(2,748)
Recoveries	700	767	2,055	2,111
Balance at the end of the period	$ 997	$ 914	$ 997	$ 914