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INCOME TAXES - Additional Information (Detail) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Sep. 30, 2024
Sep. 30, 2023
Dec. 31, 2023
Income Tax Contingency [Line Items]          
Maximum corporate tax rate     37.50%    
Net deferred tax asset $ 137,500   $ 137,500   $ 150,100
Valuation allowance 121,600   121,600   139,200
Income tax expense 22,659 $ 26,968 $ 72,155 $ 89,187  
Estimated annual effective tax rate, excluding entities from which a tax benefit cannot be recognized and discrete items     23.70% 28.20%  
Current income tax expense 2,800 2,800 $ 7,700 $ 6,800  
Tax contingency accrual release in connection with the expiration of the statute of limitation on some uncertain tax positions     400    
Santander [Member]          
Income Tax Contingency [Line Items]          
UTBs 400   400    
Unrecognized Tax Benefits, Income Tax Penalties and Interest Expense     100    
Subsidiaries [Member]          
Income Tax Contingency [Line Items]          
Net deferred tax asset 137,500   137,500   150,100
Valuation allowance 93,400   93,400   $ 111,400
Parent Company [Member]          
Income Tax Contingency [Line Items]          
Income tax expense $ 0 $ 0 $ 1 $ 1