ALLOWANCE FOR CREDIT LOSSES AND CREDIT QUALITY INFORMATION - Analysis of Collateral Dependent and Impaired Loans (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
Property
Accounts, Notes, Loans and Financing Receivable [Line Items]
Amortized cost basis of nonaccruing collateral-dependent loans	$ 62,026	$ 19,880
Equipment and other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Amortized cost basis of nonaccruing collateral-dependent loans	1,983	2,922
Commercial | Commercial and industrial | Property
Accounts, Notes, Loans and Financing Receivable [Line Items]
Amortized cost basis of nonaccruing collateral-dependent loans	17,230	3,848
Commercial | Commercial and industrial | Equipment and other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Amortized cost basis of nonaccruing collateral-dependent loans	1,983	2,922
Commercial | Owner-occupied commercial | Property
Accounts, Notes, Loans and Financing Receivable [Line Items]
Amortized cost basis of nonaccruing collateral-dependent loans	4,862	386
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	22,292	5,159
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	12,617	5,143
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	2,579	3,199
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	2,446	2,145
Consumer | Equipment and other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Amortized cost basis of nonaccruing collateral-dependent loans	$ 0	$ 0