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LOANS AND ALLOWANCE FOR CREDIT LOSSES - Allowance Activity (Details) - USD ($) $ in Thousands	3 Months Ended		12 Months Ended
	Mar. 31, 2021	Mar. 31, 2020	Dec. 31, 2020
Activity in the allowance for loan losses
Balance at beginning of period	$ 19,082	$ 15,353	$ 15,353
Charged-off loans	(216)	(1,211)
Recoveries on charged-off loans	48	44
Provision for credit losses	(489)	1,111
Balance at end of period	23,653	15,297	19,082
Impact of CECL Adoption
Activity in the allowance for loan losses
Balance at beginning of period	5,228
Balance at end of period			5,228
Commercial construction | Total commercial loans
Activity in the allowance for loan losses
Balance at beginning of period	824	317	317
Recoveries on charged-off loans	18
Provision for credit losses	(246)	78
Balance at end of period	1,792	395	824
Commercial construction | Total commercial loans | Impact of CECL Adoption
Activity in the allowance for loan losses
Balance at beginning of period	1,196
Balance at end of period			1,196
Commercial real estate owner occupied | Total commercial real estate
Activity in the allowance for loan losses
Balance at beginning of period	1,783	2,368	2,368
Charged-off loans	(153)
Recoveries on charged-off loans	0
Provision for credit losses	1,014	(882)
Balance at end of period	3,352	1,486	1,783
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
Balance at end of period			708
Commercial real estate non-owner occupied | Total commercial real estate
Activity in the allowance for loan losses
Balance at beginning of period	7,864	4,695	4,695
Charged-off loans		(871)
Recoveries on charged-off loans	4	25
Provision for credit losses	42	1,465
Balance at end of period	5,902	5,314	7,864
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)
Balance at end of period			(2,008)
Tax exempt
Activity in the allowance for loan losses
Balance at beginning of period	58	67	67
Provision for credit losses	(4)	(10)
Balance at end of period	94	57	58
Tax exempt | Impact of CECL Adoption
Activity in the allowance for loan losses
Balance at beginning of period	40
Balance at end of period			40
Commercial and industrial | Total commercial and industrial
Activity in the allowance for loan losses
Balance at beginning of period	3,137	3,262	3,262
Charged-off loans		(179)
Recoveries on charged-off loans	1	9
Provision for credit losses	(1,094)	231
Balance at end of period	5,040	3,323	3,137
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
Balance at end of period			2,996
Residential mortgages | Total residential real estate
Activity in the allowance for loan losses
Balance at beginning of period	5,010	4,213	4,213
Charged-off loans	(40)	(8)
Recoveries on charged-off loans	13	7
Provision for credit losses	(146)	79
Balance at end of period	6,569	4,291	5,010
Residential mortgages | Total residential real estate | Impact of CECL Adoption
Activity in the allowance for loan losses
Balance at beginning of period	1,732
Balance at end of period			1,732
Home equity
Activity in the allowance for loan losses
Balance at beginning of period	285	320	320
Charged-off loans	(22)
Recoveries on charged-off loans	11
Provision for credit losses	(54)	8
Balance at end of period	823	328	285
Home equity | Impact of CECL Adoption
Activity in the allowance for loan losses
Balance at beginning of period	603
Balance at end of period			603
Consumer other | Total consumer
Activity in the allowance for loan losses
Balance at beginning of period	121	111	111
Charged-off loans	(1)	(153)
Recoveries on charged-off loans	1	3
Provision for credit losses	(1)	142
Balance at end of period	81	103	121
Consumer other | Total consumer | Impact of CECL Adoption
Activity in the allowance for loan losses
Balance at beginning of period	(39)
Balance at end of period			(39)
Unfunded Loan Commitment
Activity in the allowance for loan losses
Balance at beginning of period	359	$ 314	314
Provision for credit losses	(156)		45
Balance at end of period	1,819		359
Unfunded Loan Commitment | Impact of CECL Adoption
Activity in the allowance for loan losses
Balance at beginning of period	$ 1,616
Balance at end 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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Amount of loans and leases that have been written off from both loan receivables and allowance reserve for credit loss.

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