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INCOME TAXES - Additional Information (Detail) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Sep. 01, 2020
Dec. 31, 2019
Income Tax Contingency [Line Items]            
Effective tax rate maximum statutory rate     37.50%      
Minimum percentage of bank net taxable income for paying Income tax at normal rate     20.00%      
Income tax (benefit) expense $ (4,405) $ 19,268 $ (1,326) $ 54,897    
Estimated annual effective tax rate, excluding entities from which a tax benefit cannot be recognized and discrete items     21.00% 29.00%    
Estimated annual effective tax rate, including all entities     17.00% 30.00%    
Effective Income Tax Rate Excluding Discrete Items     23.00% 29.00%    
Deferred Tax Assets Net Increase Decrease     $ 31,300      
Deferred Tax Assets Net 347,500   347,500      
Valuation allowance 99,600   99,600      
Provision For Loan Lease And Other Losses 46,914 7,398 163,294 $ 31,340    
Santander [Member]            
Income Tax Contingency [Line Items]            
Deferred Tax Assets Net         $ 28,900  
Valuation allowance (8,000)   (8,000)      
Non-PCD Loans [Member]            
Income Tax Contingency [Line Items]            
Provision For Loan Lease And Other Losses 38,900          
Non-PCD Loans [Member] | Santander [Member]            
Income Tax Contingency [Line Items]            
Income tax (benefit) expense (13,000)          
COVID-19            
Income Tax Contingency [Line Items]            
Income tax (benefit) expense     (39,800)      
United States [Member]            
Income Tax Contingency [Line Items]            
Income tax (benefit) expense 1,200 $ 1,200 3,400 $ 3,500    
FirstBank [Member]            
Income Tax Contingency [Line Items]            
Deferred Tax Assets Net 347,200   347,200     $ 264,800
Valuation allowance $ 62,100   $ 62,100     $ 55,600
Domestic Tax Authority [Member] | Other taxable domestic corporations member [Member]            
Income Tax Contingency [Line Items]            
Dividend received deduction     85.00%      
Domestic Tax Authority [Member] | Subsidiaries [Member]            
Income Tax Contingency [Line Items]            
Dividend received deduction     100.00%