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INCOME TAXES - Additional Information (Detail) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2024 | Mar. 31, 2023 | Dec. 31, 2023
Income Tax Contingency [Line Items] |  |  |
Maximum corporate tax rate | 37.50% |  |
Net deferred tax asset | $ 147,700 |  | $ 150,100
Valuation allowance | 140,100 |  | $ 139,200
Income tax expense | $ 23,955 | $ 31,935 |
Minimum percentage of bank net taxable income for paying income tax at normal rate |  |  | 20.00%
Estimated annual effective tax rate, including all entities | 24.30% | 31.20% |
Santander [Member] |  |  |
Income Tax Contingency [Line Items] |  |  |
UTBs | $ 800 |  |
Unrecognized Tax Benefits, Income Tax Penalties and Interest Expense | 200 |  |
U S [Member] |  |  |
Income Tax Contingency [Line Items] |  |  |
Income tax expense | 2,200 | $ 2,500 |
Subsidiaries [Member] |  |  |
Income Tax Contingency [Line Items] |  |  |
Net deferred tax asset | 147,700 |  | $ 150,100
Valuation allowance | 112,700 |  | $ 111,400
Parent Company [Member] |  |  |
Income Tax Contingency [Line Items] |  |  |
Income tax expense | $ 1 | $ 1 |
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 -Topic 740 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482685/740-10-50-2 + Details
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