ALLOWANCE FOR CREDIT LOSSES AND CREDIT QUALITY INFORMATION - Schedule of Collateral Dependent Loans (Details) - USD ($) $ in Thousands	Sep. 30, 2025	Dec. 31, 2024
Accounts, Notes, Loans and Financing Receivable [Line Items]
Nonaccrual loans with no allowance	$ 35,042	$ 103,578
Property
Accounts, Notes, Loans and Financing Receivable [Line Items]
Amortized cost basis of non accruing collateral-dependent loans	53,722	101,477
Equipment and other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Amortized cost basis of non accruing collateral-dependent loans	8,080	20,704
Commercial | Commercial and industrial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Nonaccrual loans with no allowance	14,842	43,206
Commercial | Commercial and industrial | Discontinued Operations, Held-for-Sale
Accounts, Notes, Loans and Financing Receivable [Line Items]
Nonaccrual loans with no allowance	10,300
Commercial | Commercial and industrial | Property
Accounts, Notes, Loans and Financing Receivable [Line Items]
Amortized cost basis of non accruing collateral-dependent loans	6,788	41,105
Commercial | Commercial and industrial | Equipment and other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Amortized cost basis of non accruing collateral-dependent loans	8,054	20,704
Commercial | Owner-occupied commercial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Nonaccrual loans with no allowance	6,502	4,710
Commercial | Owner-occupied commercial | Property
Accounts, Notes, Loans and Financing Receivable [Line Items]
Amortized cost basis of non accruing collateral-dependent loans	6,502	4,710
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	3,145	22,223
Commercial | Commercial mortgages | Property
Accounts, Notes, Loans and Financing Receivable [Line Items]
Amortized cost basis of non accruing collateral-dependent loans	3,145	22,223
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	2,621	25,600
Commercial | Construction | Property
Accounts, Notes, Loans and Financing Receivable [Line Items]
Amortized cost basis of non accruing collateral-dependent loans	29,381	25,600
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	4,892	5,011
Residential | Property
Accounts, Notes, Loans and Financing Receivable [Line Items]
Amortized cost basis of non accruing collateral-dependent loans	4,892	5,011
Residential | Equipment and other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Amortized cost basis of non accruing collateral-dependent loans	0	0
Consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
Nonaccrual loans with no allowance	3,040	2,828
Consumer | Property
Accounts, Notes, Loans and Financing Receivable [Line Items]
Amortized cost basis of non accruing collateral-dependent loans	3,014	2,828
Consumer | Equipment and other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Amortized cost basis of non accruing collateral-dependent loans	$ 26	$ 0