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ALLOWANCE FOR CREDIT LOSSES FOR LOANS AND FINANCE LEASES - Carrying Amount of Portfolios (Details) - USD ($) $ in Thousands | 9 Months Ended | 12 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | ---
Sep. 30, 2025 | Dec. 31, 2024 | Jun. 30, 2025 | Sep. 30, 2024 | Jun. 30, 2024 | Dec. 31, 2023
Financing Receivable Allowance For Credit Losses [Line Items] |  |  |  |  |  |
Amortized cost of loans | $ 13,048,684 | $ 12,746,556 |  |  |  |
Allowance for credit losses | 246,990 | 243,942 | $ 248,578 | $ 246,996 | $ 254,532 | $ 261,843
Residential Mortgage Loans [Member] |  |  |  |  |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |  |  |  |  |
Amortized cost of loans | 2,889,081 | 2,828,431 |  |  |  |
Allowance for credit losses | $ 40,272 | $ 40,654 | 42,448 | 40,651 | 46,051 | 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 | 1.39% | 1.44% |  |  |  |
Commercial Portfolio Segment [Member] | Construction Loans [Member] |  |  |  |  |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |  |  |  |  |
Amortized cost of loans | $ 259,863 | $ 228,396 |  |  |  |
Allowance for credit losses | $ 5,360 | $ 3,824 | 4,551 | 3,998 | 5,646 | 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 | 2.06% | 1.67% |  |  |  |
Commercial Portfolio Segment [Member] | Commercial Mortgage Loans [Member] |  |  |  |  |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |  |  |  |  |
Amortized cost of loans | $ 2,549,375 | $ 2,565,984 |  |  |  |
Allowance for credit losses | $ 25,366 | $ 22,447 | 22,746 | 24,205 | 30,078 | 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 | 0.99% | 0.87% |  |  |  |
Commercial Portfolio Segment [Member] | Commercial and Industrial Loans [Member] |  |  |  |  |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |  |  |  |  |
Amortized cost of loans | $ 3,614,241 | $ 3,366,038 |  |  |  |
Allowance for credit losses | $ 37,854 | $ 33,034 | 39,359 | 35,099 | 35,440 | 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 | 1.05% | 0.98% |  |  |  |
Consumer Portfolio Segment [Member] |  |  |  |  |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |  |  |  |  |
Amortized cost of loans | $ 3,736,124 | $ 3,757,707 |  |  |  |
Allowance for credit losses | $ 138,138 | $ 143,983 | $ 139,474 | $ 143,043 | $ 137,317 | $ 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 | 3.70% | 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 | 1.89% | 1.91% |  |  |  |

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