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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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- Definition Amount excluding accrued interest, of allowance for credit loss on financing receivable. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=124255206&loc=SL82895884-210446 + Details
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- Definition Amount excluding accrued interest, before allowance for credit loss, of financing receivable. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 50 -Paragraph 5 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=124255953&loc=SL82919230-210447 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=124255206&loc=SL82895884-210446 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 50 -Paragraph 3B -URI http://asc.fasb.org/extlink&oid=124255953&loc=SL120267963-210447 + Details
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