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LOANS AND ALLOWANCE FOR CREDIT LOSSES - Allowance Activity (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Activity in the allowance for loan losses
Balance at beginning of period	$ 22,815	$ 16,509	$ 19,082	$ 15,353
Charged-off loans	(286)	(439)	(741)	(1,870)
Recoveries on charged-off loans	93	37	307	159
Provision for credit losses	(174)	1,800	(1,428)	4,265
Balance at end of period	22,448	17,907	22,448	17,907
Impact of CECL Adoption
Activity in the allowance for loan losses
Balance at beginning of period			5,228
Commercial construction | Total commercial loans
Activity in the allowance for loan losses
Balance at beginning of period	2,372	532	824	317
Recoveries on charged-off loans			18
Provision for credit losses	(286)	185	48	400
Balance at end of period	2,086	717	2,086	717
Commercial construction | Total commercial loans | Impact of CECL Adoption
Activity in the allowance for loan losses
Balance at beginning of period			1,196
Commercial real estate owner occupied | Total commercial loans
Activity in the allowance for loan losses
Balance at beginning of period				2,368
Provision for credit losses				(474)
Balance at end of period		1,894		1,894
Commercial real estate owner occupied | Total commercial real estate
Activity in the allowance for loan losses
Balance at beginning of period	2,552	1,524	1,783
Charged-off loans	(142)		(403)
Recoveries on charged-off loans	72		72
Provision for credit losses	237	370	559
Balance at end of period	2,719	1,894	2,719	1,894
Commercial real estate owner occupied | Total commercial real estate | Impact of CECL Adoption
Activity in the allowance for loan losses
Balance at beginning of period			708
Commercial real estate non-owner occupied | Total commercial loans
Activity in the allowance for loan losses
Balance at beginning of period		5,926		4,695
Charged-off loans		(266)		(1,137)
Recoveries on charged-off loans		14		109
Provision for credit losses		783		2,790
Balance at end of period		6,457		6,457
Commercial real estate non-owner occupied | Total commercial real estate
Activity in the allowance for loan losses
Balance at beginning of period	5,604		7,864
Recoveries on charged-off loans			4
Provision for credit losses	(22)		(278)
Balance at end of period	5,582		5,582
Commercial real estate non-owner occupied | Total commercial real estate | Impact of CECL Adoption
Activity in the allowance for loan losses
Balance at beginning of period			(2,008)
Tax exempt
Activity in the allowance for loan losses
Balance at beginning of period	91	64	58	67
Provision for credit losses	(6)	4	(13)	1
Balance at end of period	85	68	85	68
Tax exempt | Impact of CECL Adoption
Activity in the allowance for loan losses
Balance at beginning of period			40
Commercial and industrial | Total commercial and industrial
Activity in the allowance for loan losses
Balance at beginning of period	5,225	3,056	3,137	3,262
Charged-off loans	(24)	(24)	(44)	(360)
Recoveries on charged-off loans		14	14	25
Provision for credit losses	105	236	(797)	355
Balance at end of period	5,306	3,282	5,306	3,282
Commercial and industrial | Total commercial and industrial | Impact of CECL Adoption
Activity in the allowance for loan losses
Balance at beginning of period			2,996
Residential mortgages | Total residential real estate
Activity in the allowance for loan losses
Balance at beginning of period	6,069	4,991	5,010	4,213
Charged-off loans	(6)		(67)	(32)
Recoveries on charged-off loans	19	1	141	12
Provision for credit losses	(290)	86	(1,024)	885
Balance at end of period	5,792	5,078	5,792	5,078
Residential mortgages | Total residential real estate | Impact of CECL Adoption
Activity in the allowance for loan losses
Balance at beginning of period			1,732
Home equity
Activity in the allowance for loan losses
Balance at beginning of period	822	318	285	320
Charged-off loans	(49)		(108)
Recoveries on charged-off loans	1		48
Provision for credit losses	30	(4)	(24)	(6)
Balance at end of period	804	314	804	314
Home equity | Impact of CECL Adoption
Activity in the allowance for loan losses
Balance at beginning of period			603
Consumer other | Total consumer
Activity in the allowance for loan losses
Balance at beginning of period	80	98	121	111
Charged-off loans	(65)	(149)	(119)	(341)
Recoveries on charged-off loans	1	8	10	13
Provision for credit losses	58	140	101	314
Balance at end of period	74	97	74	97
Consumer other | Total consumer | Impact of CECL Adoption
Activity in the allowance for loan losses
Balance at beginning of period			(39)
Unfunded Loan Commitment
Activity in the allowance for loan losses
Balance at beginning of period	1,921	319	359	314
Provision for credit losses	280	2	226	7
Balance at end of period	$ 2,201	$ 321	2,201	$ 321
Unfunded Loan Commitment | Impact of CECL Adoption
Activity in the allowance for loan losses
Balance at beginning of period			$ 1,616

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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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