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INCOME TAXES - Additional Information (Detail) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2022
Sep. 30, 2021
Sep. 30, 2022
Sep. 30, 2021
Dec. 31, 2021
Income Tax Contingency [Line Items]          
Maximum corporate tax rate     37.50%    
Valuation allowance $ 195,800   $ 195,800    
Income tax expense 32,028 $ 37,057 $ 109,156 $ 105,171  
Minimum percentage of bank net taxable income for paying income tax at normal rate     20.00%    
Estimated annual effective tax rate, excluding entities from which a tax benefit cannot be recognized and discrete items     31.80% 33.20%  
Estimated annual effective tax rate, including all entities     32.00% 33.60%  
Effective Income Tax Rate Excluding Discrete Items     32.40% 33.80%  
Deferred tax asset that will be realized 166,100   $ 166,100    
Accrued interest and penalties related to uncertain tax positions 200   200    
Current income tax expense 3,000 $ 2,100 7,100 $ 4,500  
Santander [Member]          
Income Tax Contingency [Line Items]          
UTBs 800   800    
Benefit recognized from expiration of uncertain tax postions acquired 400        
FirstBank [Member]          
Income Tax Contingency [Line Items]          
Valuation allowance 158,700   158,700   $ 69,700
Deferred tax asset that will be realized $ 166,000   $ 166,000   $ 208,400
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%