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ALLOWANCE FOR CREDIT LOSSES ON LOANS AND FINANCE LOSSES - Activity in ACL on loans and finance leases (Parenthetical) (Detail) - USD ($) $ in Thousands |  | 12 Months Ended
--- | --- | ---
Sep. 01, 2020 | Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Financing Receivable Allowance For Credit Losses [Line Items] |  |  |  |
Provision for credit losses - (benefit) expense |  | $ 25,679 | $ (61,720) | $ 168,717
Non-PCD | Santander [Member] |  |  |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |  |  |
Provision for credit losses - (benefit) expense | $ 37,500 |  |  |
Residential Portfolio Segment [Member] |  |  |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |  |  |
Provision for credit losses - (benefit) expense |  | (8,734) | (16,957) | 22,427
Residential Portfolio Segment [Member] | Non-PCD | Santander [Member] |  |  |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |  |  |
Provision for credit losses - (benefit) expense | 13,500 |  |  |
Commercial Portfolio Segment [Member] | Commercial And Industrial Sector [Member] |  |  |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |  |  |
Provision for credit losses - (benefit) expense |  | (1,770) | (8,549) | 6,627
Commercial Portfolio Segment [Member] | Mortgage Receivable [Member] |  |  |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |  |  |
Provision for credit losses - (benefit) expense |  | (18,994) | (55,358) | 81,125
Commercial Portfolio Segment [Member] | Mortgage Receivable [Member] | Non-PCD | Santander [Member] |  |  |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |  |  |
Provision for credit losses - (benefit) expense | 9,200 |  |  |
Consumer Portfolio Segment [Member] |  |  |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |  |  |
Provision for credit losses - (benefit) expense |  | $ 57,519 | $ 20,552 | $ 56,433
Consumer Portfolio Segment [Member] | Non-PCD | Santander [Member] |  |  |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |  |  |
Provision for credit losses - (benefit) expense | 10,200 |  |  |
Nonperforming Financial Instruments [Member] | Commercial Portfolio Segment [Member] | Commercial And Industrial Sector [Member] | Santander [Member] |  |  |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |  |  |
Provision for credit losses - (benefit) expense | $ 4,600 |  |  |

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- Definition Amount of expense related to estimated loss from loan and lease transactions. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (a) -URI https://asc.fasb.org/extlink&oid=126954810&loc=d3e3602-108585 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 220 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04.11) -URI https://asc.fasb.org/extlink&oid=120399700&loc=SL114874048-224260 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (c)(2) -URI https://asc.fasb.org/extlink&oid=123577603&loc=SL6953423-111524 + Details
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