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ALLOWANCE FOR LOAN LOSSES - Allowance Activity (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Activity in the allowance for loan losses
Balance at beginning of period				$ 15,353					$ 15,353
Provision (release) for loan losses	$ 1,360	$ 1,800	$ 1,354	1,111	$ 538	$ 893	$ 562	$ 324	5,625	$ 2,317	$ 2,780
Balance at end of period	19,082				15,353				19,082	15,353
Allowance For Loan Losses
Total	19,082			15,353	15,353				15,353	15,353		$ 19,082	$ 15,353
Business Activities Loans
Activity in the allowance for loan losses
Balance at beginning of period				15,057				13,581	15,057	13,581	12,153
Charged-off loans									(1,925)	(885)	(1,382)
Recoveries on charged-off loans									220	320	535
Provision (release) for loan losses									5,434	2,041	2,275
Balance at end of period	18,786				15,057				18,786	15,057	13,581
Allowance For Loan Losses
Individually evaluated for impairment												434	1,452	$ 611
Collectively evaluated												18,352	13,605	12,970
Total	18,786			15,057	15,057			13,581	15,057	15,057	12,153	18,786	15,057	13,581
Business Activities Loans | Total commercial real estate
Activity in the allowance for loan losses
Balance at beginning of period				7,668				6,811	7,668	6,811	6,037
Charged-off loans									(1,036)	(212)	(417)
Recoveries on charged-off loans									154	194	275
Provision (release) for loan losses									4,167	875	916
Balance at end of period	10,953				7,668				10,953	7,668	6,811
Allowance For Loan Losses
Individually evaluated for impairment												366	1,231	422
Collectively evaluated												10,587	6,437	6,389
Total	10,953			7,668	7,668			6,811	10,953	6,811	6,037	10,953	7,668	6,811
Business Activities Loans | Total commercial and industrial
Activity in the allowance for loan losses
Balance at beginning of period				3,608				2,380	3,608	2,380	2,373
Charged-off loans									(540)	(336)	(111)
Recoveries on charged-off loans									21	65	76
Provision (release) for loan losses									288	1,499	42
Balance at end of period	3,377				3,608				3,377	3,608	2,380
Allowance For Loan Losses
Individually evaluated for impairment													164	78
Collectively evaluated												3,377	3,444	2,302
Total	3,377			3,608	3,608			2,380	3,377	2,380	2,373	3,377	3,608	2,380
Business Activities Loans | Total residential real estate
Activity in the allowance for loan losses
Balance at beginning of period				3,402				3,982	3,402	3,982	3,357
Charged-off loans									(43)	(109)	(225)
Recoveries on charged-off loans										55	166
Provision (release) for loan losses									718	(526)	684
Balance at end of period	4,077				3,402				4,077	3,402	3,982
Allowance For Loan Losses
Individually evaluated for impairment												67	57	111
Collectively evaluated												4,010	3,345	3,871
Total	4,077			3,402	3,402			3,982	4,077	3,982	3,357	4,077	3,402	3,982
Business Activities Loans | Total consumer
Activity in the allowance for loan losses
Balance at beginning of period				379				408	379	408	386
Charged-off loans									(306)	(228)	(629)
Recoveries on charged-off loans									45	6	18
Provision (release) for loan losses									261	193	633
Balance at end of period	379				379				379	379	408
Allowance For Loan Losses
Individually evaluated for impairment												1
Collectively evaluated												378	379	408
Total	379			379	379			408	379	408	386	379	379	408
Acquired Loans
Activity in the allowance for loan losses
Balance at beginning of period				296				285	296	285	172
Charged-off loans									(243)	(268)	(525)
Recoveries on charged-off loans									52	3	133
Provision (release) for loan losses									191	276	505
Balance at end of period	296				296				296	296	285
Allowance For Loan Losses
Individually evaluated for impairment												296	61	41
Collectively evaluated													235	244
Total	296			296	296			285	296	285	172	296	296	285
Acquired Loans | Total commercial real estate
Activity in the allowance for loan losses
Balance at beginning of period				147				173	147	173	97
Charged-off loans									(101)		(136)
Recoveries on charged-off loans									19		43
Provision (release) for loan losses									225	(26)	169
Balance at end of period	290				147				290	147	173
Allowance For Loan Losses
Individually evaluated for impairment												290	12
Collectively evaluated													135	173
Total	290			147	147			173	147	147	97	290	147	173
Acquired Loans | Total commercial and industrial
Activity in the allowance for loan losses
Balance at beginning of period				6				35	6	35	16
Charged-off loans									(53)	(23)	(166)
Recoveries on charged-off loans									9		7
Provision (release) for loan losses									43	(6)	178
Balance at end of period	5				6				5	6	35
Allowance For Loan Losses
Individually evaluated for impairment												5
Collectively evaluated													6	35
Total	5			6	6			35	6	6	16	5	6	35
Acquired Loans | Total residential real estate
Activity in the allowance for loan losses
Balance at beginning of period				143				77	143	77	59
Charged-off loans									(11)	(240)	(158)
Recoveries on charged-off loans									13
Provision (release) for loan losses									(144)	306	176
Balance at end of period	1				143				1	143	77
Allowance For Loan Losses
Individually evaluated for impairment												1	49	41
Collectively evaluated													94	36
Total	$ 1			$ 143	$ 143			$ 77	143	143	59	$ 1	$ 143	$ 77
Acquired Loans | Total consumer
Activity in the allowance for loan losses
Charged-off loans									(78)	(5)	(65)
Recoveries on charged-off loans									11	3	83
Provision (release) for loan losses									$ 67	$ 2	$ (18)

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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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