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INCOME TAXES - Additional Information (Detail) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Dec. 31, 2021
Income Tax Contingency [Line Items]      
Maximum corporate tax rate 37.50%    
Valuation allowance $ 147,000    
Income tax expense $ 43,025 $ 28,022  
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 32.90% 30.60%  
Estimated annual effective tax rate, including all entities 33.20% 30.60%  
Effective Income Tax Rate Excluding Discrete Items 33.50% 31.10%  
Deferred tax asset that will be realized $ 176,800    
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 1,600 $ 1,100  
FirstBank [Member]      
Income Tax Contingency [Line Items]      
Valuation allowance 107,500   $ 69,700
Deferred tax asset that will be realized $ 176,700   $ 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%