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ALLOWANCE FOR CREDIT LOSSES FOR LOANS AND FINANCE LEASES - Carrying Amount of Portfolios (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | ---
Mar. 31, 2025 | Dec. 31, 2024 | Mar. 31, 2024 | Dec. 31, 2023
Financing Receivable Allowance For Credit Losses [Line Items] |  |  |  |
Amortized cost of loans | $ 12,675,398 | $ 12,746,556 |  |
Allowance for credit losses | 247,269 | 243,942 | $ 263,592 | $ 261,843
Residential Mortgage Loans [Member] |  |  |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |  |  |
Amortized cost of loans | 2,837,846 | 2,828,431 |  |
Allowance for credit losses | $ 41,640 | $ 40,654 | 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 | 1.47% | 1.44% |  |
Commercial Portfolio Segment [Member] | Construction Loans [Member] |  |  |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |  |  |
Amortized cost of loans | $ 234,441 | $ 228,396 |  |
Allowance for credit losses | $ 3,417 | $ 3,824 | 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 | 1.46% | 1.67% |  |
Commercial Portfolio Segment [Member] | Commercial Mortgage Loans [Member] |  |  |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |  |  |
Amortized cost of loans | $ 2,501,689 | $ 2,565,984 |  |
Allowance for credit losses | $ 24,143 | $ 22,447 | 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 | 0.97% | 0.87% |  |
Commercial Portfolio Segment [Member] | Commercial and Industrial Loans [Member] |  |  |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |  |  |
Amortized cost of loans | $ 3,359,868 | $ 3,366,038 |  |
Allowance for credit losses | $ 36,464 | $ 33,034 | 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 | 1.09% | 0.98% |  |
Consumer Portfolio Segment [Member] |  |  |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |  |  |
Amortized cost of loans | $ 3,741,554 | $ 3,757,707 |  |
Allowance for credit losses | $ 141,605 | $ 143,983 | $ 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 | 3.78% | 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 | 1.95% | 1.91% |  |

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