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LOANS AND ALLOWANCE FOR CREDIT LOSSES - Additional Information (Details)	3 Months Ended
	Mar. 31, 2022 USD ($) loan	Mar. 31, 2021 USD ($) loan	Dec. 31, 2021 USD ($)	Dec. 31, 2020 USD ($)
Financing Receivable, Allowance for Credit Loss [Line Items]
Allowance for credit loss	$ 38,117,000	$ 35,555,000	$ 37,588,000	$ 34,340,000
Loans	3,756,363,000		3,634,792,000
Provision (Benefit) for Credit Losses on Loans	1,600,000	$ 2,122,000
Amortized cost in troubled debt restructurings	18,100,000		16,600,000
Financing receivable, troubled debt restructuring, allowance for loans	$ 2,600,000		2,600,000
Number of Loans | loan	1	2
Minimum period to be considered for loan to have defaulted	90 days
Loans modified as troubled debt restructuring with subsequent defaults | loan	0	0
Principal balances forgiven in connection with loan restructuring	$ 0	$ 0
Syndicated
Financing Receivable, Allowance for Credit Loss [Line Items]
Loans	147,085,000		125,761,000
Unfunded Loan Commitment
Financing Receivable, Allowance for Credit Loss [Line Items]
Provision (Benefit) for Credit Losses on Loans	586,000	0
Commercial and Industrial
Financing Receivable, Allowance for Credit Loss [Line Items]
Allowance for credit loss	9,090,000	6,479,000	8,837,000	$ 6,233,000
Loans	717,252,000		708,989,000
Provision (Benefit) for Credit Losses on Loans		$ 297,000
Commercial and Industrial | Syndicated
Financing Receivable, Allowance for Credit Loss [Line Items]
Loans	$ 147,100,000		$ 125,800,000

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Amount excluding accrued interest, of allowance for credit loss on financing receivable.

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Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 326
-SubTopic 20
-Section 45
-Paragraph 1
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Amount excluding accrued interest, before allowance for credit loss, of financing receivable.

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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Amount of credit loss expense (reversal of expense) for financing receivable.

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