LOANS AND ALLOWANCE FOR CREDIT LOSSES - Modifications (Details) $ in Thousands	3 Months Ended	9 Months Ended
	Sep. 30, 2023 USD ($)	Sep. 30, 2023 USD ($)
Financing Receivable, Troubled Debt Restructuring [Line Items]
Amortized cost basis	$ 992	$ 3,187
Commercial mortgages, other
Financing Receivable, Troubled Debt Restructuring [Line Items]
Amortized cost basis	$ 875	$ 3,070
% of Loan Class	0.09%	0.32%
Weighted-average interest rate reduction (%)	0.00%	0.00%
Weighted-average term extension (in months)	6 months	19 months
Weighted-average payment delay (in months)		4 months
Home equity lines and loans
Financing Receivable, Troubled Debt Restructuring [Line Items]
Amortized cost basis	$ 117	$ 117
% of Loan Class	0.13%	0.13%
Weighted-average interest rate reduction (%)	0.00%	0.00%
Weighted-average term extension (in months)	180 months	180 months
Principal Reduction
Financing Receivable, Troubled Debt Restructuring [Line Items]
Amortized cost basis	$ 0	$ 0
Principal Reduction | Commercial mortgages, other
Financing Receivable, Troubled Debt Restructuring [Line Items]
Amortized cost basis	0	0
Principal Reduction	0	0
Principal Reduction | Home equity lines and loans
Financing Receivable, Troubled Debt Restructuring [Line Items]
Amortized cost basis	0	0
Principal Reduction	0	0
Interest Rate Reduction
Financing Receivable, Troubled Debt Restructuring [Line Items]
Amortized cost basis	0	0
Interest Rate Reduction | Commercial mortgages, other
Financing Receivable, Troubled Debt Restructuring [Line Items]
Amortized cost basis	0	0
Interest Rate Reduction | Home equity lines and loans
Financing Receivable, Troubled Debt Restructuring [Line Items]
Amortized cost basis	0	0
Term Extension
Financing Receivable, Troubled Debt Restructuring [Line Items]
Amortized cost basis	992	1,267
Term Extension | Commercial mortgages, other
Financing Receivable, Troubled Debt Restructuring [Line Items]
Amortized cost basis	875	1,150
Term Extension | Home equity lines and loans
Financing Receivable, Troubled Debt Restructuring [Line Items]
Amortized cost basis	117	117
Payment Delay
Financing Receivable, Troubled Debt Restructuring [Line Items]
Amortized cost basis	0	1,920
Payment Delay | Commercial mortgages, other
Financing Receivable, Troubled Debt Restructuring [Line Items]
Amortized cost basis	0	1,920
Payment Delay | Home equity lines and loans
Financing Receivable, Troubled Debt Restructuring [Line Items]
Amortized cost basis	0	0
Combination
Financing Receivable, Troubled Debt Restructuring [Line Items]
Amortized cost basis	0	0
Combination | Commercial mortgages, other
Financing Receivable, Troubled Debt Restructuring [Line Items]
Amortized cost basis	0	0
Combination | Home equity lines and loans
Financing Receivable, Troubled Debt Restructuring [Line Items]
Amortized cost basis	$ 0	$ 0