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ALLOWANCE FOR CREDIT LOSSES FOR LOANS AND FINANCE LEASES - Carrying Amount of Portfolios (Detail) - USD ($) $ in Thousands | 9 Months Ended | 12 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | ---
Sep. 30, 2021 | Dec. 31, 2020 | Jun. 30, 2021 | Sep. 30, 2020 | Jun. 30, 2020 | Dec. 31, 2019
Financing Receivable Allowance For Credit Losses [Line Items] |  |  |  |  |  |
Financing Receivable, before Allowance for Credit Loss | $ 11,140,582 | $ 11,777,289 |  |  |  |
Allowance for credit losses on loans and finance leases | $ 288,360 | $ 385,887 | $ 324,958 | $ 384,718 | $ 319,297 | $ 155,139
Allowance for credit losses, numerator [Member] | Amortized cost, denominator [Member] |  |  |  |  |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |  |  |  |  |
Allowance for credit losses to amortized cost | 2.59% | 3.28% |  |  |  |
Residential mortgage loans [Member] |  |  |  |  |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |  |  |  |  |
Financing Receivable, before Allowance for Credit Loss | $ 3,095,015 | $ 3,521,954 |  |  |  |
Allowance for credit losses on loans and finance leases | 83,226 | 120,311 | 112,882 | 131,781 | 111,450 | 44,806
Residential mortgage loans [Member] | Loans held for investmet [Member] |  |  |  |  |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |  |  |  |  |
Financing Receivable, before Allowance for Credit Loss | $ 3,095,015 | $ 3,521,954 |  |  |  |
Residential mortgage loans [Member] | Allowance for credit losses, numerator [Member] | Amortized cost, denominator [Member] |  |  |  |  |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |  |  |  |  |
Allowance for credit losses to amortized cost | 2.69% | 3.42% |  |  |  |
Commercial Portfolio Segment [Member] | Commercial And Industrial Sector [Member] |  |  |  |  |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |  |  |  |  |
Financing Receivable, before Allowance for Credit Loss | $ 2,932,712 | $ 3,202,590 |  |  |  |
Allowance for credit losses on loans and finance leases | 33,348 | 37,944 | 37,470 | 42,909 | 38,310 | 15,198
Commercial Portfolio Segment [Member] | Commercial And Industrial Sector [Member] | Loans held for investmet [Member] |  |  |  |  |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |  |  |  |  |
Financing Receivable, before Allowance for Credit Loss | $ 2,932,712 | $ 3,202,590 |  |  |  |
Commercial Portfolio Segment [Member] | Commercial And Industrial Sector [Member] | Allowance for credit losses, numerator [Member] | Amortized cost, denominator [Member] |  |  |  |  |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |  |  |  |  |
Allowance for credit losses to amortized cost | 1.14% | 1.18% |  |  |  |
Commercial Portfolio Segment [Member] | Mortgage Receivable [Member] |  |  |  |  |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |  |  |  |  |
Financing Receivable, before Allowance for Credit Loss | $ 2,136,502 | $ 2,230,602 |  |  |  |
Allowance for credit losses on loans and finance leases | 67,406 | 109,342 | 72,452 | 75,726 | 49,435 | 39,194
Commercial Portfolio Segment [Member] | Mortgage Receivable [Member] | Loans held for investmet [Member] |  |  |  |  |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |  |  |  |  |
Financing Receivable, before Allowance for Credit Loss | $ 2,136,502 | $ 2,230,602 |  |  |  |
Commercial Portfolio Segment [Member] | Mortgage Receivable [Member] | Allowance for credit losses, numerator [Member] | Amortized cost, denominator [Member] |  |  |  |  |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |  |  |  |  |
Allowance for credit losses to amortized cost | 3.15% | 4.90% |  |  |  |
Commercial Portfolio Segment [Member] | Construction Loans [Member] |  |  |  |  |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |  |  |  |  |
Financing Receivable, before Allowance for Credit Loss | $ 170,208 | $ 212,500 |  |  |  |
Allowance for credit losses on loans and finance leases | 5,319 | 5,380 | 4,757 | 10,241 | 7,800 | 2,370
Commercial Portfolio Segment [Member] | Construction Loans [Member] | Loans held for investmet [Member] |  |  |  |  |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |  |  |  |  |
Financing Receivable, before Allowance for Credit Loss | $ 170,208 | $ 212,500 |  |  |  |
Commercial Portfolio Segment [Member] | Construction Loans [Member] | Allowance for credit losses, numerator [Member] | Amortized cost, denominator [Member] |  |  |  |  |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |  |  |  |  |
Allowance for credit losses to amortized cost | 3.13% | 2.53% |  |  |  |
Consumer Portfolio Segment [Member] |  |  |  |  |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |  |  |  |  |
Financing Receivable, before Allowance for Credit Loss | $ 2,806,145 | $ 2,609,643 |  |  |  |
Allowance for credit losses on loans and finance leases | 99,061 | 112,910 | $ 97,397 | $ 124,061 | $ 112,302 | $ 53,571
Consumer Portfolio Segment [Member] | Loans held for investmet [Member] |  |  |  |  |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |  |  |  |  |
Financing Receivable, before Allowance for Credit Loss | $ 2,806,145 | $ 2,609,643 |  |  |  |
Consumer Portfolio Segment [Member] | Allowance for credit losses, numerator [Member] | Amortized cost, denominator [Member] |  |  |  |  |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |  |  |  |  |
Allowance for credit losses to amortized cost | 3.53% | 4.33% |  |  |  |

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