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INCOME TAXES - Additional Information (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Sep. 01, 2020
Income Tax Contingency [Line Items]        
Maximum corporate tax rate 37.50% 37.50% 37.50%  
Net deferred tax asset $ 155,584 $ 208,482    
Deferred tax asset related to NOLs 279,900 177,900    
Valuation allowance 185,506 107,323    
Income tax expense $ 142,512 146,792 $ 14,050  
Minimum percentage of bank net taxable income for paying income tax at normal rate 20.00%      
Current income tax expense $ 88,296 28,469 18,421  
NOL and capital losses carryforward 72,485 137,860    
Year 2023 Through 2027 [Member]        
Income Tax Contingency [Line Items]        
NOL and capital losses carryforward 61,200      
Year 2023 [Member]        
Income Tax Contingency [Line Items]        
NOL and capital losses carryforward 30,500      
Santander [Member]        
Income Tax Contingency [Line Items]        
UTBs       $ 1,000
Unrecognized Tax Benefits, Income Tax Penalties and Interest Expense 200      
Benefit recognized from expiration of uncertain tax positions acquired 400      
U S [Member]        
Income Tax Contingency [Line Items]        
Income tax expense 10,300 6,800 4,900  
Subsidiaries [Member]        
Income Tax Contingency [Line Items]        
Net deferred tax asset 155,600 208,400    
Valuation allowance 149,500 69,700    
Parent Company [Member]        
Income Tax Contingency [Line Items]        
Valuation allowance 36,000      
Income tax expense $ 3,448 $ 2,854 $ 2,429  
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%