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ALLOWANCE FOR CREDIT LOSSES ON LOANS AND FINANCE LOSSES - Activity in ACL on loans and finance leases (Detail) - USD ($) $ in Thousands |  | 12 Months Ended |
--- | --- | --- | ---
Sep. 01, 2020 | Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020 | Jan. 01, 2020
Financing Receivable Allowance For Credit Losses [Line Items] |  |  |  |  |
Beginning balance |  | $ 269,030 | $ 385,887 | $ 155,139 |
Allowance established for acquired PCD loans | $ 28,744 |  |  |  |
Provision for credit losses - (benefit) expense |  | 25,679 | (61,720) | 168,717 |
Charge-offs |  | (57,330) | (80,710) | (64,540) |
Recoveries |  | 23,085 | 25,573 | 16,662 |
Ending balance |  | 260,464 | 269,030 | 385,887 |
ASC 326 [Member] | Cumulative Effect, Period of Adoption, Adjustment [Member] |  |  |  |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |  |  |  |
Impact of adopting ASC 326 |  |  |  |  | $ 81,165
Residential Portfolio Segment [Member] |  |  |  |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |  |  |  |
Beginning balance |  | 74,837 | 120,311 | 44,806 |
Allowance established for acquired PCD loans | 12,739 |  |  |  |
Provision for credit losses - (benefit) expense |  | (8,734) | (16,957) | 22,427 |
Charge-offs |  | (6,890) | (33,294) | (11,017) |
Recoveries |  | 3,547 | 4,777 | 1,519 |
Ending balance |  | 62,760 | 74,837 | 120,311 |
Residential Portfolio Segment [Member] | ASC 326 [Member] | Cumulative Effect, Period of Adoption, Adjustment [Member] |  |  |  |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |  |  |  |
Impact of adopting ASC 326 |  |  |  |  | 49,837
Commercial Portfolio Segment [Member] | Commercial And Industrial Sector [Member] |  |  |  |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |  |  |  |
Beginning balance |  | 34,284 | 37,944 | 15,198 |
Allowance established for acquired PCD loans | 1,830 |  |  |  |
Provision for credit losses - (benefit) expense |  | (1,770) | (8,549) | 6,627 |
Charge-offs |  | (2,067) | (1,887) | (3,634) |
Recoveries |  | 2,459 | 6,776 | 3,192 |
Ending balance |  | 32,906 | 34,284 | 37,944 |
Commercial Portfolio Segment [Member] | Commercial And Industrial Sector [Member] | ASC 326 [Member] | Cumulative Effect, Period of Adoption, Adjustment [Member] |  |  |  |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |  |  |  |
Impact of adopting ASC 326 |  |  |  |  | 14,731
Commercial Portfolio Segment [Member] | Mortgage Receivable [Member] |  |  |  |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |  |  |  |
Beginning balance |  | 52,771 | 109,342 | 39,194 |
Allowance established for acquired PCD loans | 9,723 |  |  |  |
Provision for credit losses - (benefit) expense |  | (18,994) | (55,358) | 81,125 |
Charge-offs |  | (85) | (1,494) | (3,330) |
Recoveries |  | 1,372 | 281 | 1,936 |
Ending balance |  | 35,064 | 52,771 | 109,342 |
Commercial Portfolio Segment [Member] | Mortgage Receivable [Member] | ASC 326 [Member] | Cumulative Effect, Period of Adoption, Adjustment [Member] |  |  |  |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |  |  |  |
Impact of adopting ASC 326 |  |  |  |  | (19,306)
Commercial Portfolio Segment [Member] | Construction Loans [Member] |  |  |  |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |  |  |  |
Beginning balance |  | 4,048 | 5,380 | 2,370 |
Allowance established for acquired PCD loans | 0 |  |  |  |
Provision for credit losses - (benefit) expense |  | (2,342) | (1,408) | 2,105 |
Charge-offs |  | (123) | (87) | (76) |
Recoveries |  | 725 | 163 | 184 |
Ending balance |  | 2,308 | 4,048 | 5,380 |
Commercial Portfolio Segment [Member] | Construction Loans [Member] | ASC 326 [Member] | Cumulative Effect, Period of Adoption, Adjustment [Member] |  |  |  |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |  |  |  |
Impact of adopting ASC 326 |  |  |  |  | 797
Consumer Portfolio Segment [Member] |  |  |  |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |  |  |  |
Beginning balance |  | 103,090 | 112,910 | 53,571 |
Allowance established for acquired PCD loans | $ 4,452 |  |  |  |
Provision for credit losses - (benefit) expense |  | 57,519 | 20,552 | 56,433 |
Charge-offs |  | (48,165) | (43,948) | (46,483) |
Recoveries |  | 14,982 | 13,576 | 9,831 |
Ending balance |  | $ 127,426 | $ 103,090 | $ 112,910 |
Consumer Portfolio Segment [Member] | ASC 326 [Member] | Cumulative Effect, Period of Adoption, Adjustment [Member] |  |  |  |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |  |  |  |
Impact of adopting ASC 326 |  |  |  |  | $ 35,106

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