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ALLOWANCE FOR CREDIT LOSSES FOR LOANS AND FINANCE LEASES - Carrying Amount of Portfolios (Details) - USD ($) $ in Thousands	6 Months Ended	12 Months Ended
	Jun. 30, 2025	Dec. 31, 2024	Mar. 31, 2025	Jun. 30, 2024	Mar. 31, 2024	Dec. 31, 2023
Financing Receivable Allowance For Credit Losses [Line Items]
Amortized cost of loans	$ 12,870,002	$ 12,746,556
Allowance for credit losses	248,578	243,942	$ 247,269	$ 254,532	$ 263,592	$ 261,843
Residential Mortgage Loans [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Amortized cost of loans	2,859,158	2,828,431
Allowance for credit losses	$ 42,448	$ 40,654	41,640	46,051	56,689	57,397
Residential Mortgage Loans [Member] | Allowance for loan and lease losses, numerator [Member] | Loans Receivable [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Allowance for credit losses to amortized cost	1.48%	1.44%
Commercial Portfolio Segment [Member] | Construction Loans [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Amortized cost of loans	$ 245,350	$ 228,396
Allowance for credit losses	$ 4,551	$ 3,824	3,417	5,646	6,186	5,605
Commercial Portfolio Segment [Member] | Construction Loans [Member] | Allowance for loan and lease losses, numerator [Member] | Loans Receivable [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Allowance for credit losses to amortized cost	1.85%	1.67%
Commercial Portfolio Segment [Member] | Commercial Mortgage Loans [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Amortized cost of loans	$ 2,502,475	$ 2,565,984
Allowance for credit losses	$ 22,746	$ 22,447	24,143	30,078	32,661	32,631
Commercial Portfolio Segment [Member] | Commercial Mortgage Loans [Member] | Allowance for loan and lease losses, numerator [Member] | Loans Receivable [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Allowance for credit losses to amortized cost	0.91%	0.87%
Commercial Portfolio Segment [Member] | Commercial and Industrial Loans [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Amortized cost of loans	$ 3,516,008	$ 3,366,038
Allowance for credit losses	$ 39,359	$ 33,034	36,464	35,440	35,423	33,996
Commercial Portfolio Segment [Member] | Commercial and Industrial Loans [Member] | Allowance for loan and lease losses, numerator [Member] | Loans Receivable [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Allowance for credit losses to amortized cost	1.12%	0.98%
Consumer Portfolio Segment [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Amortized cost of loans	$ 3,747,011	$ 3,757,707
Allowance for credit losses	$ 139,474	$ 143,983	$ 141,605	$ 137,317	$ 132,633	$ 132,214
Consumer Portfolio Segment [Member] | Allowance for loan and lease losses, numerator [Member] | Loans Receivable [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Allowance for credit losses to amortized cost	3.72%	3.83%
Loan Total [Member] | Allowance for loan and lease losses, numerator [Member] | Loans Receivable [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Allowance for credit losses to amortized cost	1.93%	1.91%

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