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INCOME TAXES - Additional Information (Detail) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Dec. 31, 2020
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 Expense (Benefit) $ 37,057 $ (4,405) $ 105,171 $ (1,326)  
Estimated annual effective tax rate, excluding entities from which a tax benefit cannot be recognized and discrete items     33.00% 21.00%  
Estimated annual effective tax rate, including all entities     34.00% 17.00%  
Effective Income Tax Rate Excluding Discrete Items     34.00% 23.00%  
Deferred Tax Assets Net 243,400   $ 243,400    
Valuation allowance 106,300   106,300    
Accrued interest and penalties related to uncertain tax positions 100   100    
BSPR          
Income Tax Contingency [Line Items]          
Valuation allowance   (8,000)   $ (8,000)  
Unrecognized Tax Benefits 1,000   1,000    
United States [Member]          
Income Tax Contingency [Line Items]          
Income Tax Expense (Benefit) 2,100 $ 1,200 4,500 $ 3,400  
FirstBank [Member]          
Income Tax Contingency [Line Items]          
Deferred Tax Assets Net 243,400   243,400   $ 329,100
Valuation allowance $ 65,600   $ 65,600   $ 59,900
Domestic Tax Authority [Member] | Other taxable domestic corporations [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%