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ALLOWANCE FOR LOAN LOSSES - Allowance Activity (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Allowance for loan losses
Loan relationships having aggregate balances in excess of threshold with potential credit weakness												$ 150
Activity in the allowance for loan losses
Balance at beginning of period				$ 12,325					$ 12,325
Provision/(releases) for loan losses	$ 572	$ 643	$ 770	795	$ 597	$ 660	$ 736	$ 795	2,780	$ 2,788	$ 979
Balance at end of period	13,866				12,325				13,866	12,325
Allowance For Loan Losses
Individually evaluated for impairment												354	$ 0	$ 9
Total	13,866			12,325	12,325				12,325	12,325		13,866	12,325
Business Activities Loans
Activity in the allowance for loan losses
Balance at beginning of period				12,153				10,419	12,153	10,419	9,439
Charged-off loans									(1,382)	(701)	(411)
Recoveries on charged-off loans									535	143	412
Provision/(releases) for loan losses									2,275	2,292	979
Balance at end of period	13,581				12,153				13,581	12,153	10,419
Allowance For Loan Losses
Individually evaluated for impairment												611	459	424
Collectively evaluated												12,970	11,694	9,995
Total	13,581			12,153	12,153			10,419	12,153	10,419	9,439	13,581	12,153	10,419
Business Activities Loans | Commercial real estate
Activity in the allowance for loan losses
Balance at beginning of period				6,037				5,145	6,037	5,145	4,430
Charged-off loans									(417)	(124)	(133)
Recoveries on charged-off loans									275	49	40
Provision/(releases) for loan losses									916	967	808
Balance at end of period	6,811				6,037				6,811	6,037	5,145
Allowance For Loan Losses
Individually evaluated for impairment												422	447	193
Collectively evaluated												6,389	5,590	4,952
Total	6,811			6,037	6,037			5,145	6,037	5,145	4,430	6,811	6,037	5,145
Business Activities Loans | Commercial and industrial
Activity in the allowance for loan losses
Balance at beginning of period				2,373				1,952	2,373	1,952	1,590
Charged-off loans									(111)	(189)	(90)
Recoveries on charged-off loans									76	11	289
Provision/(releases) for loan losses									42	599	163
Balance at end of period	2,380				2,373				2,380	2,373	1,952
Allowance For Loan Losses
Individually evaluated for impairment												78	3	173
Collectively evaluated												2,302	2,370	1,779
Total	2,380			2,373	2,373			1,952	2,373	1,952	1,590	2,380	2,373	1,952
Business Activities Loans | Residential real estate
Activity in the allowance for loan losses
Balance at beginning of period				3,357				2,721	3,357	2,721	2,747
Charged-off loans									(225)	(226)	(141)
Recoveries on charged-off loans									166	65	44
Provision/(releases) for loan losses									684	797	71
Balance at end of period	3,982				3,357				3,982	3,357	2,721
Allowance For Loan Losses
Individually evaluated for impairment												111	9	49
Collectively evaluated												3,871	3,348	2,672
Total	3,982			3,357	3,357			2,721	3,357	2,721	2,747	3,982	3,357	2,721
Business Activities Loans | Consumer
Activity in the allowance for loan losses
Balance at beginning of period				386				601	386	601	672
Charged-off loans									(629)	(162)	(47)
Recoveries on charged-off loans									18	18	39
Provision/(releases) for loan losses									633	(71)	(63)
Balance at end of period	408				386				408	386	601
Allowance For Loan Losses
Individually evaluated for impairment												0	0	9
Collectively evaluated												408	386	592
Total	408			386	386			601	386	601	672	408	386	601
Acquired Loans
Activity in the allowance for loan losses
Balance at beginning of period				172				0	172	0
Charged-off loans									(525)	(325)
Recoveries on charged-off loans									133	1
Provision/(releases) for loan losses									505	496
Balance at end of period	285				172				285	172	0
Allowance For Loan Losses
Individually evaluated for impairment												41	0
Collectively evaluated												244	172
Total	285			172	172			0	172	0	0	285	172	0
Acquired Loans | Commercial real estate
Activity in the allowance for loan losses
Balance at beginning of period				97				0	97	0
Charged-off loans									(136)	(151)
Recoveries on charged-off loans									43	1
Provision/(releases) for loan losses									169	247
Balance at end of period	173				97				173	97	0
Allowance For Loan Losses
Individually evaluated for impairment												0	0
Collectively evaluated												173	97
Total	173			97	97			0	97	0	0	173	97	0
Acquired Loans | Commercial and industrial
Activity in the allowance for loan losses
Balance at beginning of period				16				0	16	0
Charged-off loans									(166)	(18)
Recoveries on charged-off loans									7	0
Provision/(releases) for loan losses									178	34
Balance at end of period	35				16				35	16	0
Allowance For Loan Losses
Individually evaluated for impairment												0	0
Collectively evaluated												35	16
Total	35			16	16			0	16	0	0	35	16	0
Acquired Loans | Residential real estate
Activity in the allowance for loan losses
Balance at beginning of period				59				0	59	0
Charged-off loans									(158)	(29)
Recoveries on charged-off loans									0	0
Provision/(releases) for loan losses									176	88
Balance at end of period	77				59				77	59	0
Allowance For Loan Losses
Individually evaluated for impairment												41	0
Collectively evaluated												36	59
Total	77			59	59			0	59	0	0	77	59	0
Acquired Loans | Consumer
Activity in the allowance for loan losses
Balance at beginning of period				0				0	0	0
Charged-off loans									(65)	(127)
Recoveries on charged-off loans									83	0
Provision/(releases) for loan losses									(18)	127
Balance at end of period	0				0				0	0	0
Allowance For Loan Losses
Individually evaluated for impairment												0	0
Collectively evaluated												0	0
Total	$ 0			$ 0	$ 0			$ 0	$ 0	$ 0	$ 0	$ 0	$ 0	$ 0

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