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LOANS AND CREDIT QUALITY - Allowance for Credit Losses (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
ACL for LHFI
Beginning balance	$ 64,294	$ 41,772	$ 41,470
Provision for credit losses	(15,816)	21,843	(122)
Net (charge-offs) recoveries	(1,355)	(1,164)	424
Ending balance	47,123	64,294	41,772
Allowance for unfunded commitments
Beginning balance	1,588	1,065	1,443
Provision for credit losses	816	(1,374)	(378)
Allowance for credit losses-loans	(15,816)	21,843	(122)
Ending balance	2,404	1,588	1,065
Total	$ (15,000)	20,469	(500)
Cumulative Effect, Period of Adoption, Adjustment
ACL for LHFI
Beginning balance		1,843
Ending balance			1,843
Allowance for unfunded commitments
Beginning balance		$ 1,897
Ending balance			$ 1,897

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Allowance For Unfunded Commitments

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

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Amount of allowance for credit loss on financing receivable. Excludes allowance for financing receivable covered under loss sharing agreement.

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Amount of expected credit loss for credit exposure on off-balance-sheet commitment, including but not limited to, loan commitment, standby letter of credit, financial guarantee not accounted for as insurance. Excludes off-balance sheet credit exposure accounted for as insurance and instrument accounted for under derivatives and hedging.

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