LOANS AND ALLOWANCE FOR LOAN LOSSES - Allowance (Details) - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Changes in the allowance for loan losses
Balance at beginning of period	$ 25,760	$ 11,775	$ 10,939
Charge-offs	(1,616)	(2,179)	(1,008)
Recoveries	316	34	55
Provision (release)	(6,857)	16,484	1,789
Allowance contributed with mortgage combination transaction		(354)
Balance at end of period	17,603	25,760	11,775
Individually evaluated for impairment	475	1,296	574
Collectively evaluated for impairment, allowance	17,128	24,464	11,201
Collectively evaluated for impairment	1,830,317	1,399,968
Purchased credit impaired loans
Changes in the allowance for loan losses
Balance at beginning of period	84	0
Charge-offs	(3)	(11)
Provision (release)	(582)	(95)
Balance at end of period	663	84	0
Collectively evaluated for impairment, allowance	663	84
Collectively evaluated for impairment	18,700
Commercial
Changes in the allowance for loan losses
Balance at beginning of period	24,033	10,098	8,605
Charge-offs	(1,367)	(1,932)	(998)
Recoveries	231	22	1
Provision (release)	(8,797)	15,845	2,490
Allowance contributed with mortgage combination transaction		0
Balance at end of period	14,100	24,033	10,098
Individually evaluated for impairment	475	1,296	574
Collectively evaluated for impairment, allowance	13,625	22,737	9,524
Collectively evaluated for impairment	1,466,727	1,127,780
Commercial \| Purchased credit impaired loans
Changes in the allowance for loan losses
Collectively evaluated for impairment	13,900
Residential
Changes in the allowance for loan losses
Balance at beginning of period	1,378	1,272	1,405
Charge-offs	(2)	(224)	0
Recoveries	0	0	1
Provision (release)	(428)	684	(134)
Allowance contributed with mortgage combination transaction		(354)
Balance at end of period	948	1,378	1,272
Individually evaluated for impairment	0	0	0
Collectively evaluated for impairment, allowance	948	1,378	1,272
Collectively evaluated for impairment	297,961	238,304
Residential \| Purchased credit impaired loans
Changes in the allowance for loan losses
Balance at beginning of period	84	0
Charge-offs	(3)	(11)
Provision (release)	(463)	(95)
Balance at end of period	544	84	0
Collectively evaluated for impairment, allowance	544	84
Collectively evaluated for impairment	4,400
Home equity
Changes in the allowance for loan losses
Balance at beginning of period	298	327	684
Charge-offs	0	(23)	0
Recoveries	24	9	4
Provision (release)	(194)	(15)	(361)
Allowance contributed with mortgage combination transaction		0
Balance at end of period	128	298	327
Individually evaluated for impairment	0	0	0
Collectively evaluated for impairment, allowance	128	298	327
Collectively evaluated for impairment	21,969	30,733
Consumer
Changes in the allowance for loan losses
Balance at beginning of period	51	78	245
Charge-offs	(247)	0	(10)
Recoveries	61	3	49
Provision (release)	2,562	(30)	(206)
Allowance contributed with mortgage combination transaction		0
Balance at end of period	2,427	51	78
Individually evaluated for impairment	0	0	0
Collectively evaluated for impairment, allowance	2,427	51	78
Collectively evaluated for impairment	43,660	3,151
Consumer \| Purchased credit impaired loans
Changes in the allowance for loan losses
Balance at beginning of period	0	0
Charge-offs	0	0
Provision (release)	(119)	0
Balance at end of period	119	0	$ 0
Collectively evaluated for impairment, allowance	119	$ 0
Collectively evaluated for impairment	$ 400

Financing Receivable, Allowance for Credit Loss, Excluding Purchased Credit Deteriorated Loans Acquired During Period

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- Definition

Financing Receivable, Credit Loss, Allowance Contributed In Business Combination

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- Definition

The valuation allowance for financing receivables that are expected to be uncollectible that were collectively evaluated for impairment.

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Amount of valuation allowance for financing receivables that are expected to be uncollectible that were individually evaluated for impairment.

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Amount of increase in allowance for credit loss on financing receivable from recovery.

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A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

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Amount of writeoff of financing receivable, charged against allowance for credit loss.

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The balance of financing receivables that were collectively evaluated for impairment.

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Amount of credit loss expense (reversal of expense) for financing receivable.

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