ALLOWANCE FOR CREDIT LOSSES AND CREDIT QUALITY INFORMATION - Analysis of Collateral Dependent and Impaired Loans (Details) - USD ($) $ in Thousands	Jun. 30, 2022	Dec. 31, 2021
Property
Accounts, Notes, Loans and Financing Receivable [Line Items]
Amortized cost basis of nonaccruing collateral-dependent loans	$ 18,365	$ 12,597
Equipment and other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Amortized cost basis of nonaccruing collateral-dependent loans	2,646	4,012
Commercial | Commercial and industrial | Property
Accounts, Notes, Loans and Financing Receivable [Line Items]
Amortized cost basis of nonaccruing collateral-dependent loans	3,987	4,199
Commercial | Commercial and industrial | Equipment and other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Amortized cost basis of nonaccruing collateral-dependent loans	2,614	4,012
Commercial | Owner-occupied commercial | Property
Accounts, Notes, Loans and Financing Receivable [Line Items]
Amortized cost basis of nonaccruing collateral-dependent loans	353	811
Commercial | Owner-occupied commercial | Equipment and other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Amortized cost basis of nonaccruing collateral-dependent loans	0	0
Commercial | Commercial mortgages | Property
Accounts, Notes, Loans and Financing Receivable [Line Items]
Amortized cost basis of nonaccruing collateral-dependent loans	4,263	2,070
Commercial | Commercial mortgages | Equipment and other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Amortized cost basis of nonaccruing collateral-dependent loans	0	0
Commercial | Construction | Property
Accounts, Notes, Loans and Financing Receivable [Line Items]
Amortized cost basis of nonaccruing collateral-dependent loans	5,184	12
Commercial | Construction | Equipment and other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Amortized cost basis of nonaccruing collateral-dependent loans	0	0
Residential | Property
Accounts, Notes, Loans and Financing Receivable [Line Items]
Amortized cost basis of nonaccruing collateral-dependent loans	2,573	3,125
Residential | Equipment and other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Amortized cost basis of nonaccruing collateral-dependent loans	0	0
Consumer | Property
Accounts, Notes, Loans and Financing Receivable [Line Items]
Amortized cost basis of nonaccruing collateral-dependent loans	2,005	2,380
Consumer | Equipment and other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Amortized cost basis of nonaccruing collateral-dependent loans	$ 32	$ 0