ALLOWANCE FOR CREDIT LOSSES AND CREDIT QUALITY INFORMATION - Schedule of Troubled Loans Disaggregated by Portfolio Segment (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024
Financing Receivable, Troubled Debt Restructuring [Line Items]
Total	$ 40,947	$ 57,449	$ 111,850	$ 125,556
% of Total Loan Category	0.32%	0.43%	0.86%	0.94%
Term Extension
Financing Receivable, Troubled Debt Restructuring [Line Items]
Total	$ 37,522	$ 40,005	$ 98,002	$ 103,296
Interest Rate Reduction
Financing Receivable, Troubled Debt Restructuring [Line Items]
Total		121		121
More-Than-Insignificant Payment Delay
Financing Receivable, Troubled Debt Restructuring [Line Items]
Total	136	16,061	3,566	17,950
Combination- Term Extension and Payment Delay
Financing Receivable, Troubled Debt Restructuring [Line Items]
Total	3,289	1,234	10,282	4,161
Combination- Term Extension and Interest Rate Reduction
Financing Receivable, Troubled Debt Restructuring [Line Items]
Total		28		28
Commercial | Commercial and industrial
Financing Receivable, Troubled Debt Restructuring [Line Items]
Total	$ 16,167	$ 22,206	$ 21,037	$ 83,539
% of Total Loan Category	0.62%	0.84%	0.80%	3.17%
Commercial | Commercial and industrial | Term Extension
Financing Receivable, Troubled Debt Restructuring [Line Items]
Total	$ 15,895	$ 7,021	$ 18,235	$ 66,728
Commercial | Commercial and industrial | Interest Rate Reduction
Financing Receivable, Troubled Debt Restructuring [Line Items]
Total		0		0
Commercial | Commercial and industrial | More-Than-Insignificant Payment Delay
Financing Receivable, Troubled Debt Restructuring [Line Items]
Total	0	15,157	2,500	16,028
Commercial | Commercial and industrial | Combination- Term Extension and Payment Delay
Financing Receivable, Troubled Debt Restructuring [Line Items]
Total	272	0	302	755
Commercial | Commercial and industrial | Combination- Term Extension and Interest Rate Reduction
Financing Receivable, Troubled Debt Restructuring [Line Items]
Total		28		28
Commercial | Owner-occupied commercial
Financing Receivable, Troubled Debt Restructuring [Line Items]
Total	$ 3,495		$ 4,360
% of Total Loan Category	0.18%		0.23%
Commercial | Owner-occupied commercial | Term Extension
Financing Receivable, Troubled Debt Restructuring [Line Items]
Total	$ 484		$ 610
Commercial | Owner-occupied commercial | More-Than-Insignificant Payment Delay
Financing Receivable, Troubled Debt Restructuring [Line Items]
Total	0		739
Commercial | Owner-occupied commercial | Combination- Term Extension and Payment Delay
Financing Receivable, Troubled Debt Restructuring [Line Items]
Total	3,011		3,011
Commercial | Commercial mortgages
Financing Receivable, Troubled Debt Restructuring [Line Items]
Total	$ 19,158	$ 14,557	$ 56,980	$ 14,557
% of Total Loan Category	0.50%	0.35%	1.48%	0.35%
Commercial | Commercial mortgages | Term Extension
Financing Receivable, Troubled Debt Restructuring [Line Items]
Total	$ 19,158	$ 14,557	$ 50,410	$ 14,557
Commercial | Commercial mortgages | Interest Rate Reduction
Financing Receivable, Troubled Debt Restructuring [Line Items]
Total		0		0
Commercial | Commercial mortgages | More-Than-Insignificant Payment Delay
Financing Receivable, Troubled Debt Restructuring [Line Items]
Total	0	0	0	0
Commercial | Commercial mortgages | Combination- Term Extension and Payment Delay
Financing Receivable, Troubled Debt Restructuring [Line Items]
Total	0	0	6,570	0
Commercial | Commercial mortgages | Combination- Term Extension and Interest Rate Reduction
Financing Receivable, Troubled Debt Restructuring [Line Items]
Total		0		0
Commercial | Construction
Financing Receivable, Troubled Debt Restructuring [Line Items]
Total	$ 1,714	$ 18,120	$ 28,474	$ 21,294
% of Total Loan Category	0.17%	2.25%	2.84%	2.64%
Commercial | Construction | Term Extension
Financing Receivable, Troubled Debt Restructuring [Line Items]
Total	$ 1,714	$ 18,120	$ 28,474	$ 21,294
Commercial | Construction | Interest Rate Reduction
Financing Receivable, Troubled Debt Restructuring [Line Items]
Total		0		0
Commercial | Construction | More-Than-Insignificant Payment Delay
Financing Receivable, Troubled Debt Restructuring [Line Items]
Total	0	0	0	0
Commercial | Construction | Combination- Term Extension and Payment Delay
Financing Receivable, Troubled Debt Restructuring [Line Items]
Total	0	0	0	0
Commercial | Construction | Combination- Term Extension and Interest Rate Reduction
Financing Receivable, Troubled Debt Restructuring [Line Items]
Total		0		0
Residential
Financing Receivable, Troubled Debt Restructuring [Line Items]
Total		$ 146		$ 146
% of Total Loan Category		0.02%		0.02%
Residential | Term Extension
Financing Receivable, Troubled Debt Restructuring [Line Items]
Total		$ 0		$ 0
Residential | Interest Rate Reduction
Financing Receivable, Troubled Debt Restructuring [Line Items]
Total		121		121
Residential | More-Than-Insignificant Payment Delay
Financing Receivable, Troubled Debt Restructuring [Line Items]
Total		25		25
Residential | Combination- Term Extension and Payment Delay
Financing Receivable, Troubled Debt Restructuring [Line Items]
Total		0		0
Residential | Combination- Term Extension and Interest Rate Reduction
Financing Receivable, Troubled Debt Restructuring [Line Items]
Total		0		0
Consumer
Financing Receivable, Troubled Debt Restructuring [Line Items]
Total	$ 413	$ 2,420	$ 999	$ 6,020
% of Total Loan Category	0.02%	0.11%	0.05%	0.28%
Consumer | Term Extension
Financing Receivable, Troubled Debt Restructuring [Line Items]
Total	$ 271	$ 307	$ 273	$ 717
Consumer | Interest Rate Reduction
Financing Receivable, Troubled Debt Restructuring [Line Items]
Total		0		0
Consumer | More-Than-Insignificant Payment Delay
Financing Receivable, Troubled Debt Restructuring [Line Items]
Total	136	879	327	1,897
Consumer | Combination- Term Extension and Payment Delay
Financing Receivable, Troubled Debt Restructuring [Line Items]
Total	$ 6	1,234	$ 399	3,406
Consumer | Combination- Term Extension and Interest Rate Reduction
Financing Receivable, Troubled Debt Restructuring [Line Items]
Total		$ 0		$ 0