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LOANS AND ALLOWANCE FOR CREDIT LOSSES - Summary of Total Loans (Details) $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2021 USD ($) loan	Dec. 31, 2020 USD ($) loan	Mar. 31, 2020 USD ($)	Dec. 31, 2019 USD ($)
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	$ 2,551,064	$ 2,562,885
Allowance for credit losses	23,653	19,082	$ 15,297	$ 15,353
Net loans	2,527,411	2,543,803
Accrued interest receivable for loans	11,900	11,400
Tax exempt
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	46,541	47,862
Allowance for credit losses	94	58	57	67
Net loans	46,541
Home equity
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	93,625	100,096
Allowance for credit losses	$ 823	$ 285	328	320
Paycheck Protection Program [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of loans outstanding | loan	1,057	746
Outstanding principal balance	$ 77,900	$ 53,800
Paycheck Protection Program, Round 2021 [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of loans outstanding | loan	956
Outstanding principal balance		57,400
Total commercial loans | Commercial construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	$ 117,464	117,882
Allowance for credit losses	1,792	824	395	317
Net loans	117,464
Total commercial real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans		1,084,381
Total commercial real estate | Commercial real estate owner occupied
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	233,847	219,217
Allowance for credit losses	3,352	1,783	1,486	2,368
Net loans	233,847
Total commercial real estate | Commercial real estate non-owner occupied
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	733,507	716,776
Allowance for credit losses	5,902	7,864	5,314	4,695
Net loans	733,507
Total commercial and industrial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans		441,069
Total commercial and industrial | Commercial and industrial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	376,395	355,684
Allowance for credit losses	5,040	3,137	3,323	3,262
Net loans	376,395
Total residential real estate | Residential mortgages
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	940,127	995,216
Allowance for credit losses	6,569	5,010	4,291	4,213
Total consumer | Consumer other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	9,558	10,152
Allowance for credit losses	$ 81	$ 121	$ 103	$ 111

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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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