LOANS AND ALLOWANCE FOR LOAN LOSSES - Allowance (Details) $ in Thousands	1 Months Ended	12 Months Ended			36 Months Ended
	Dec. 31, 2013 USD ($)	Dec. 31, 2016 USD ($)	Dec. 31, 2015 USD ($)	Dec. 31, 2014 USD ($)	Dec. 31, 2016 USD ($)
Changes in the allowance for loan losses
Balance at beginning of period		$ 8,006	$ 6,223	$ 4,935	$ 4,935
Charge-offs		(2,557)	(747)	(1,308)
Recoveries		21	37	14
Provision		3,631	2,493	2,582
Balance at end of period	$ 4,935	9,101	8,006	6,223	9,101
Individually evaluated for impairment		543	1,013	690	543
Collectively evaluated for impairment		8,558	6,993	5,533	8,558
Commercial
Changes in the allowance for loan losses
Balance at beginning of period		6,066	4,363	3,609	3,609
Charge-offs		(1,995)	(708)	(1,110)
Recoveries		9	20	7
Provision		3,101	2,391	1,857
Balance at end of period	3,609	7,181	6,066	4,363	7,181
Individually evaluated for impairment		376	708	362	376
Collectively evaluated for impairment		6,805	5,358	4,001	6,805
Financing Receivable, Net [Abstract]
Loans acquired, purchase price	$ 74,300
Premium on loans acquired ratio	1.024
Loans acquired, premium paid	$ 1,800
Loans acquired, outstanding balance		$ 20,500	46,800		20,500
Loans acquired, outstanding balance, decrease					53,800
Loans acquired, refinanced					19,600
Loans acquired, sold in participation					10,500
Loans acquired, sold back to institution					9,700
Loans acquired, amortization					6,200
Loans acquired, principal paydowns					$ 7,800
Loans acquired, remaining portfolio, weighted average yield		5.57%			5.57%
Residential
Changes in the allowance for loan losses
Balance at beginning of period		$ 1,095	962	519	$ 519
Charge-offs		(124)	(28)	(130)
Recoveries		2	2	0
Provision		17	159	573
Balance at end of period	519	990	1,095	962	990
Individually evaluated for impairment		122	276	298	122
Collectively evaluated for impairment		868	819	664	868
Home Equity
Changes in the allowance for loan losses
Balance at beginning of period		715	691	554	554
Charge-offs		(100)	(5)	0
Recoveries		9	4	3
Provision		104	25	134
Balance at end of period	554	728	715	691	728
Individually evaluated for impairment		36	28	28	36
Collectively evaluated for impairment		692	687	663	692
Consumer
Changes in the allowance for loan losses
Balance at beginning of period		130	207	253	253
Charge-offs		(338)	(6)	(68)
Recoveries		1	11	4
Provision		409	(82)	18
Balance at end of period	$ 253	202	130	207	202
Individually evaluated for impairment		9	1	2	9
Collectively evaluated for impairment		$ 193	$ 129	$ 205	$ 193