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ALLOWANCE FOR CREDIT LOSSES ON LOANS AND FINANCE LEASES - Carrying Amount of Portfolios (Detail) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | ---
Mar. 31, 2023 | Dec. 31, 2022 | Mar. 31, 2022 | Dec. 31, 2021
Financing Receivable Allowance For Credit Losses [Line Items] |  |  |  |
Amortized cost of loans | $ 11,577,985 | $ 11,552,825 |  |
Allowance for credit losses | 265,567 | 260,464 | $ 245,447 | $ 269,030
Residential Mortgage Loans [Member] |  |  |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |  |  |
Amortized cost of loans | 2,811,528 | 2,847,290 |  |
Allowance for credit losses | $ 64,403 | $ 62,760 | 68,820 | 74,837
Residential Mortgage Loans [Member] | Allowance for loan and lease losses, numerator [Member] | Amortized cost, denominator [Member] |  |  |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |  |  |
Allowance for credit losses to amortized cost | 2.29% | 2.20% |  |
Commercial Portfolio Segment [Member] | Commercial And Industrial Sector [Member] |  |  |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |  |  |
Amortized cost of loans | $ 2,862,189 | $ 2,886,263 |  |
Allowance for credit losses | $ 31,235 | $ 32,906 | 36,784 | 34,284
Commercial Portfolio Segment [Member] | Commercial And Industrial Sector [Member] | Allowance for loan and lease losses, numerator [Member] | Amortized cost, denominator [Member] |  |  |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |  |  |
Allowance for credit losses to amortized cost | 1.09% | 1.14% |  |
Commercial Portfolio Segment [Member] | Mortgage Receivable [Member] |  |  |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |  |  |
Amortized cost of loans | $ 2,353,659 | $ 2,358,851 |  |
Allowance for credit losses | $ 36,460 | $ 35,064 | 30,138 | 52,771
Commercial Portfolio Segment [Member] | Mortgage Receivable [Member] | Allowance for loan and lease losses, numerator [Member] | Amortized cost, denominator [Member] |  |  |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |  |  |
Allowance for credit losses to amortized cost | 1.55% | 1.49% |  |
Commercial Portfolio Segment [Member] | Construction Loans [Member] |  |  |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |  |  |
Amortized cost of loans | $ 143,664 | $ 132,953 |  |
Allowance for credit losses | $ 3,231 | $ 2,308 | 1,842 | 4,048
Commercial Portfolio Segment [Member] | Construction Loans [Member] | Allowance for loan and lease losses, numerator [Member] | Amortized cost, denominator [Member] |  |  |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |  |  |
Allowance for credit losses to amortized cost | 2.25% | 1.74% |  |
Consumer Portfolio Segment [Member] |  |  |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |  |  |
Amortized cost of loans | $ 3,406,945 | $ 3,327,468 |  |
Allowance for credit losses | $ 130,238 | $ 127,426 | $ 107,863 | $ 103,090
Consumer Portfolio Segment [Member] | Allowance for loan and lease losses, numerator [Member] | Amortized cost, denominator [Member] |  |  |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |  |  |
Allowance for credit losses to amortized cost | 3.82% | 3.83% |  |
Loan Total [Member] | Allowance for loan and lease losses, numerator [Member] | Amortized cost, denominator [Member] |  |  |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |  |  |
Allowance for credit losses to amortized cost | 2.29% | 2.25% |  |

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