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LOAN LOSS ALLOWANCE - Allowance Activity (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Activity in the allowance for loan losses
Balance at beginning of period				$ 10,419					$ 10,419
Provision/(releases) for loan losses	$ 597	$ 660	$ 736	795	$ 225	$ 139	$ 150	$ 465	2,788	$ 979	$ 1,785
Balance at end of period	12,325				10,419				12,325	10,419
Allowance For Loan Losses
Total	12,325			10,419	10,419				10,419	10,419		$ 12,325	$ 10,419
Business Activities Loans
Activity in the allowance for loan losses
Balance at beginning of period				10,419				9,439	10,419	9,439	8,969
Charged-off loans									(701)	411	1,619
Recoveries on charged-off loans									143	412	304
Provision/(releases) for loan losses									2,292	979	1,785
Balance at end of period	12,153				10,419				12,153	10,419	9,439
Allowance For Loan Losses
Individually evaluated for impairment												459	424	$ 373
Collectively evaluated												11,694	9,995	9,066
Total	12,153			10,419	10,419			9,439	10,419	9,439	8,969	12,153	10,419	9,439
Business Activities Loans | Commercial real estate
Activity in the allowance for loan losses
Balance at beginning of period				5,145				4,430	5,145	4,430	4,613
Charged-off loans									124	133	667
Recoveries on charged-off loans									49	40	98
Provision/(releases) for loan losses									967	808	386
Balance at end of period	6,037				5,145				6,037	5,145	4,430
Allowance For Loan Losses
Individually evaluated for impairment												447	193	101
Collectively evaluated												5,590	4,952	4,329
Total	6,037			5,145	5,145			4,430	5,145	4,430	4,613	6,037	5,145	4,430
Business Activities Loans | Commercial and industrial
Activity in the allowance for loan losses
Balance at beginning of period				1,952				1,590	1,952	1,590	1,277
Charged-off loans									189	90	395
Recoveries on charged-off loans									11	289	54
Provision/(releases) for loan losses									599	163	654
Balance at end of period	2,373				1,952				2,373	1,952	1,590
Allowance For Loan Losses
Individually evaluated for impairment												3	173	175
Collectively evaluated												2,370	1,779	1,415
Total	2,373			1,952	1,952			1,590	1,952	1,590	1,277	2,373	1,952	1,590
Business Activities Loans | Residential real estate
Activity in the allowance for loan losses
Balance at beginning of period				2,721				2,747	2,721	2,747	2,714
Charged-off loans									226	141	70
Recoveries on charged-off loans									65	44	129
Provision/(releases) for loan losses									797	71	(26)
Balance at end of period	3,357				2,721				3,357	2,721	2,747
Allowance For Loan Losses
Individually evaluated for impairment												9	49	97
Collectively evaluated												3,348	2,672	2,650
Total	3,357			2,721	2,721			2,747	2,721	2,747	2,714	3,357	2,721	2,747
Business Activities Loans | Consumer
Activity in the allowance for loan losses
Balance at beginning of period				601				672	601	672	365
Charged-off loans									162	47	487
Recoveries on charged-off loans									18	39	23
Provision/(releases) for loan losses									(71)	(63)	771
Balance at end of period	386				601				386	601	672
Allowance For Loan Losses
Individually evaluated for impairment												0	9	0
Collectively evaluated												386	592	672
Total	386			601	601			$ 672	601	672	$ 365	386	601	$ 672
Acquired Loans
Activity in the allowance for loan losses
Balance at beginning of period				0					0
Charged-off loans									325
Recoveries on charged-off loans									1
Provision/(releases) for loan losses									496
Balance at end of period	172				0				172	0
Allowance For Loan Losses
Individually evaluated for impairment												0
Collectively evaluated												172
Total	172			0	0				0	0		172	0
Acquired Loans | Commercial real estate
Activity in the allowance for loan losses
Balance at beginning of period				0					0
Charged-off loans									151
Recoveries on charged-off loans									1
Provision/(releases) for loan losses									247
Balance at end of period	97				0				97	0
Allowance For Loan Losses
Individually evaluated for impairment												0
Collectively evaluated												97
Total	97			0	0				0	0		97	0
Acquired Loans | Commercial and industrial
Activity in the allowance for loan losses
Balance at beginning of period				0					0
Charged-off loans									18
Recoveries on charged-off loans									0
Provision/(releases) for loan losses									34
Balance at end of period	16				0				16	0
Allowance For Loan Losses
Individually evaluated for impairment												0
Collectively evaluated												16
Total	16			0	0				0	0		16	0
Acquired Loans | Residential real estate
Activity in the allowance for loan losses
Balance at beginning of period				0					0
Charged-off loans									29
Recoveries on charged-off loans									0
Provision/(releases) for loan losses									88
Balance at end of period	59				0				59	0
Allowance For Loan Losses
Individually evaluated for impairment												0
Collectively evaluated												59
Total	59			0	0				0	0		59	0
Acquired Loans | Consumer
Activity in the allowance for loan losses
Balance at beginning of period				0					0
Charged-off loans									127
Recoveries on charged-off loans									0
Provision/(releases) for loan losses									127
Balance at end of period	0				0				0	0
Allowance For Loan Losses
Individually evaluated for impairment												0
Collectively evaluated												0
Total	$ 0			$ 0	$ 0				$ 0	$ 0		$ 0	$ 0

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- Definition

Amount of recovery of loans and lease receivables which had previously been fully or partially written-off as bad debts.

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Amount of allowance to cover probable credit losses on loans and leases. Includes carryover of or adjustments to the allowance for loan losses in connection with business combinations. Excludes allowance for loans and leases covered under loss sharing agreements.

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