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INCOME TAXES - Additional Information (Detail) - USD ($) $ in Thousands | 3 Months Ended |  |
--- | --- | --- | ---
Mar. 31, 2023 | Mar. 31, 2022 | Dec. 31, 2022 | Sep. 01, 2020
Income Tax Contingency [Line Items] |  |  |  |
Maximum corporate tax rate | 37.50% |  |  |
Income tax expense | $ 31,935 | $ 43,025 |  |
Minimum percentage of bank net taxable income for paying income tax at normal rate | 20.00% |  |  |
Estimated annual effective tax rate, including all entities | 31.20% | 32.90% |  |
Santander [Member] |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |
UTBs |  |  |  | $ 1,000
Unrecognized Tax Benefits, Income Tax Penalties and Interest Expense | $ 200 |  |  |
U S [Member] |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |
Income tax expense | 2,500 | $ 1,600 |  |
Subsidiaries [Member] |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |
Net deferred tax asset | 154,800 |  | $ 155,600 |
Valuation allowance | 139,100 |  | $ 149,500 |
Parent Company [Member] |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |
Income tax expense | $ 1,078 | $ 1,106 |  |
Domestic Country [Member] | Subsidiaries [Member] |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |
Dividend received deduction | 100.00% |  |  |
Domestic Country [Member] | Other taxable domestic corporations [Member] |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |
Dividend received deduction | 85.00% |  |  |

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- Definition Amount, after allocation of valuation allowances and deferred tax liability, of deferred tax asset attributable to deductible differences and carryforwards, without jurisdictional netting. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 2 -URI https://asc.fasb.org/extlink&oid=121826272&loc=d3e32537-109319 + Details
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