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ALLOWANCE FOR CREDIT LOSSES ON LOANS AND FINANCE LEASES - Additional Information (Detail) - USD ($) $ in Thousands |  | 3 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Sep. 01, 2020 | Sep. 30, 2021 | Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Financing Receivable Allowance For Credit Losses [Line Items] |  |  |  |  |  |
Financing Receivable Allowance For Credit Losses |  |  | $ 260,464 | $ 269,030 | $ 385,887 | $ 155,139
Increase (decrease) in ACL |  |  | (8,500) |  |  |
Provision for credit losses - (benefit) expense |  |  | 25,679 | (61,720) | 168,717 |
Net charge-offs |  |  | 34,200 |  |  |
Increase (decrease) in net charge-offs |  |  | (20,900) |  |  |
Recoveries |  |  | 23,085 | 25,573 | 16,662 |
Off-Balance Sheet, Credit Loss, Liability, Credit Loss Expense (Reversal) |  |  | 2,736 | (3,568) | 1,183 |
Off-Balance Sheet, Credit Loss, Liability |  |  | 4,273 | 1,537 | 5,105 | 0
Charge-offs |  |  | 57,330 | 80,710 | 64,540 |
Residential Portfolio Segment [Member] |  |  |  |  |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |  |  |  |  |
Financing Receivable Allowance For Credit Losses |  |  | 62,760 | 74,837 | 120,311 | 44,806
Increase (decrease) in ACL |  |  | (12,000) |  |  |
Provision for credit losses - (benefit) expense |  |  | (8,734) | (16,957) | 22,427 |
Increase (decrease) in net charge-offs |  |  | (25,200) |  |  |
Recoveries |  |  | 3,547 | 4,777 | 1,519 |
Charge-offs |  |  | 6,890 | 33,294 | 11,017 |
Residential Portfolio Segment [Member] | Nonaccrual loans [Member] |  |  |  |  |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |  |  |  |  |
Charge-offs |  | $ 23,100 |  |  |  |
Commercial Portfolio Segment [Member] |  |  |  |  |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |  |  |  |  |
Increase (decrease) in ACL |  |  | (20,800) |  |  |
Increase (decrease) in net charge-offs |  |  | 1,500 |  |  |
Amount of reserve released associated with classified loans |  |  | 4,800 |  |  |
Commercial Portfolio Segment [Member] | Construction Loans [Member] |  |  |  |  |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |  |  |  |  |
Financing Receivable Allowance For Credit Losses |  |  | 2,308 | 4,048 | 5,380 | 2,370
Provision for credit losses - (benefit) expense |  |  | (2,342) | (1,408) | 2,105 |
Recoveries |  |  | 725 | 163 | 184 |
Charge-offs |  |  | 123 | 87 | 76 |
Commercial Portfolio Segment [Member] | Mortgage Receivable [Member] |  |  |  |  |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |  |  |  |  |
Financing Receivable Allowance For Credit Losses |  |  | 35,064 | 52,771 | 109,342 | 39,194
Provision for credit losses - (benefit) expense |  |  | (18,994) | (55,358) | 81,125 |
Recoveries |  |  | 1,372 | 281 | 1,936 |
Charge-offs |  |  | 85 | 1,494 | 3,330 |
Consumer Portfolio Segment [Member] |  |  |  |  |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |  |  |  |  |
Financing Receivable Allowance For Credit Losses |  |  | 127,426 | 103,090 | 112,910 | $ 53,571
Increase (decrease) in ACL |  |  | 24,300 |  |  |
Provision for credit losses - (benefit) expense |  |  | 57,519 | 20,552 | 56,433 |
Increase (decrease) in net charge-offs |  |  | 2,800 |  |  |
Recoveries |  |  | 14,982 | 13,576 | 9,831 |
Charge-offs |  |  | $ 48,165 | $ 43,948 | $ 46,483 |
Non-PCD | Santander [Member] |  |  |  |  |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |  |  |  |  |
Provision for credit losses - (benefit) expense | $ 37,500 |  |  |  |  |
Non-PCD | Santander [Member] | Residential Portfolio Segment [Member] |  |  |  |  |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |  |  |  |  |
Provision for credit losses - (benefit) expense | 13,500 |  |  |  |  |
Non-PCD | Santander [Member] | Commercial Portfolio Segment [Member] | Mortgage Receivable [Member] |  |  |  |  |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |  |  |  |  |
Provision for credit losses - (benefit) expense | 9,200 |  |  |  |  |
Non-PCD | Santander [Member] | Consumer Portfolio Segment [Member] |  |  |  |  |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |  |  |  |  |
Provision for credit losses - (benefit) expense | $ 10,200 |  |  |  |  |

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