ALLOWANCE FOR CREDIT LOSSES AND CREDIT QUALITY INFORMATION - Schedule of Collateral Dependent Loans (Details) - USD ($) $ in Thousands	Jun. 30, 2026	Dec. 31, 2025
Accounts, Notes, Loans and Financing Receivable [Line Items]
Nonaccrual loans with no allowance	$ 62,836	$ 56,245
Property
Accounts, Notes, Loans and Financing Receivable [Line Items]
Amortized cost basis of non accruing collateral-dependent loans	61,497	62,370
Equipment and other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Amortized cost basis of non accruing collateral-dependent loans	6,774	9,528
Commercial \| Commercial and Industrial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Nonaccrual loans with no allowance	19,847	16,842
Commercial \| Commercial and Industrial \| Property
Accounts, Notes, Loans and Financing Receivable [Line Items]
Amortized cost basis of non accruing collateral-dependent loans	13,094	17,557
Commercial \| Commercial and Industrial \| Equipment and other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Amortized cost basis of non accruing collateral-dependent loans	6,753	9,504
Commercial \| Owner-occupied commercial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Nonaccrual loans with no allowance	20,343	6,581
Commercial \| Owner-occupied commercial \| Property
Accounts, Notes, Loans and Financing Receivable [Line Items]
Amortized cost basis of non accruing collateral-dependent loans	20,343	6,580
Commercial \| Owner-occupied commercial \| Equipment and other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Amortized cost basis of non accruing collateral-dependent loans	0	0
Commercial \| Commercial mortgages
Accounts, Notes, Loans and Financing Receivable [Line Items]
Nonaccrual loans with no allowance	11,522	7,565
Commercial \| Commercial mortgages \| Property
Accounts, Notes, Loans and Financing Receivable [Line Items]
Amortized cost basis of non accruing collateral-dependent loans	11,522	7,565
Commercial \| Commercial mortgages \| Equipment and other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Amortized cost basis of non accruing collateral-dependent loans	0	0
Commercial \| Construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Nonaccrual loans with no allowance	2,504	16,946
Commercial \| Construction \| Property
Accounts, Notes, Loans and Financing Receivable [Line Items]
Amortized cost basis of non accruing collateral-dependent loans	7,939	22,381
Commercial \| Construction \| Equipment and other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Amortized cost basis of non accruing collateral-dependent loans	0	0
Residential
Accounts, Notes, Loans and Financing Receivable [Line Items]
Nonaccrual loans with no allowance	5,114	5,002
Residential \| Property
Accounts, Notes, Loans and Financing Receivable [Line Items]
Amortized cost basis of non accruing collateral-dependent loans	5,114	5,002
Residential \| Equipment and other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Amortized cost basis of non accruing collateral-dependent loans	0	0
Consumer(3)
Accounts, Notes, Loans and Financing Receivable [Line Items]
Nonaccrual loans with no allowance	3,506	3,309
Consumer(3) \| Property
Accounts, Notes, Loans and Financing Receivable [Line Items]
Amortized cost basis of non accruing collateral-dependent loans	3,485	3,285
Consumer(3) \| Equipment and other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Amortized cost basis of non accruing collateral-dependent loans	$ 21	$ 24

Accounts, Notes, Loans and Financing Receivable [Line Items]