ALLOWANCE FOR LOAN LOSSES - Allowance Activity (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019	Mar. 31, 2020	Mar. 31, 2019
Activity in the allowance for loan losses
Balance at beginning of period	$ 15,353
Provision (releases) for loan losses	1,111	$ 324
Balance at end of period	15,297
Allowance For Loan Losses
Total	15,353		$ 15,297
Business Activities Loans
Activity in the allowance for loan losses
Balance at beginning of period	15,057	13,581
Charged-off loans	(1,068)	(110)
Recoveries on charged-off loans	29	38
Provision (releases) for loan losses	1,083	193
Balance at end of period	15,101	13,702
Allowance For Loan Losses
Individually evaluated for impairment			939	$ 533
Collectively evaluated			14,162	13,169
Total	15,101	13,702	15,101	13,702
Business Activities Loans | Total commercial real estate
Activity in the allowance for loan losses
Balance at beginning of period	7,668	6,811
Charged-off loans	(770)	(57)
Recoveries on charged-off loans	25	16
Provision (releases) for loan losses	738	(195)
Balance at end of period	7,661	6,575
Allowance For Loan Losses
Individually evaluated for impairment			675	396
Collectively evaluated			6,986	6,179
Total	7,661	6,575	7,661	6,575
Business Activities Loans | Commercial and industrial
Activity in the allowance for loan losses
Balance at beginning of period	3,608	2,380
Charged-off loans	(150)
Recoveries on charged-off loans	1	1
Provision (releases) for loan losses	84	397
Balance at end of period	3,543	2,778
Allowance For Loan Losses
Individually evaluated for impairment			138	53
Collectively evaluated			3,405	2,725
Total	3,543	2,778	3,543	2,778
Business Activities Loans | Residential real estate
Activity in the allowance for loan losses
Balance at beginning of period	3,402	3,982
Recoveries on charged-off loans		18
Provision (releases) for loan losses	111	(47)
Balance at end of period	3,513	3,953
Allowance For Loan Losses
Individually evaluated for impairment			126	83
Collectively evaluated			3,387	3,870
Total	3,513	3,953	3,513	3,953
Business Activities Loans | Consumer
Activity in the allowance for loan losses
Balance at beginning of period	379	408
Charged-off loans	(148)	(53)
Recoveries on charged-off loans	3	3
Provision (releases) for loan losses	150	38
Balance at end of period	384	396
Allowance For Loan Losses
Individually evaluated for impairment				1
Collectively evaluated			384	395
Total	384	396	384	396
Acquired Loans
Activity in the allowance for loan losses
Balance at beginning of period	296	285
Charged-off loans	(143)	(121)
Recoveries on charged-off loans	15
Provision (releases) for loan losses	28	131
Balance at end of period	196	295
Allowance For Loan Losses
Individually evaluated for impairment			27	38
Collectively evaluated			169	257
Total	196	295	196	295
Acquired Loans | Total commercial real estate
Activity in the allowance for loan losses
Balance at beginning of period	147	173
Charged-off loans	(101)
Provision (releases) for loan losses	18	(12)
Balance at end of period	64	161
Allowance For Loan Losses
Individually evaluated for impairment			13	16
Collectively evaluated			51	145
Total	64	161	64	161
Acquired Loans | Commercial and industrial
Activity in the allowance for loan losses
Balance at beginning of period	6	35
Charged-off loans	(29)	(16)
Recoveries on charged-off loans	9
Provision (releases) for loan losses	17	10
Balance at end of period	3	29
Allowance For Loan Losses
Collectively evaluated			3	29
Total	3	29	3	29
Acquired Loans | Residential real estate
Activity in the allowance for loan losses
Balance at beginning of period	143	77
Charged-off loans	(8)	(104)
Recoveries on charged-off loans	6
Provision (releases) for loan losses	(12)	132
Balance at end of period	129	105
Allowance For Loan Losses
Individually evaluated for impairment			14	22
Collectively evaluated			115	83
Total	129	105	$ 129	$ 105
Acquired Loans | Consumer
Activity in the allowance for loan losses
Charged-off loans	(5)	(1)
Provision (releases) for loan losses	$ 5	$ 1