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INCOME TAXES - Additional Information (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Income Tax Contingency [Line Items]      
Minimum Percentage Of Bank Net Taxable Income For Paying Income Tax At Normal Rate 20.00%    
Deferred tax asset $ 434,361 $ 510,523  
Valuation allowance $ 100,661 191,183  
Evidence used to determinate the partial reversal of valuation allowance The positive evidence considered by management in arriving at its conclusion to reverse part of the deferred tax asset valuation allowance includes factors such as: FirstBank’s three-year cumulative income position; the continued profitability following the hurricane events in 2017; and forecasts of future profitability, under several potential scenarios, that support significant utilization of NOLs prior to their expiration ranging between the years 2021 through 2024. The negative evidence considered by management includes: uncertainties around the state of the Puerto Rico economy, including the effect of hurricane recovery funds together with Puerto Rico government debt renegotiation efforts and the ultimate sustainability of the approved Fiscal Plan; and consideration of the Corporation’s still elevated levels of non-performing assets.    
Income tax expense $ 10,970 4,973 $ (37,030)
Deferred tax asset not subject to expiration period $ 104,000 125,600  
Domestic Country [Member] | Other taxable domestic corporations [Member]      
Income Tax Contingency [Line Items]      
Dividend received deduction 85.00%    
Domestic Country [Member] | Subsidiaries [Member]      
Income Tax Contingency [Line Items]      
Dividend received deduction 100.00%    
U S [Member]      
Income Tax Contingency [Line Items]      
Income tax expense $ 3,800 2,300  
United States And Virign Islands Operations [Member]      
Income Tax Contingency [Line Items]      
Income tax expense 0 $ 0  
FirstBank [Member]      
Income Tax Contingency [Line Items]      
Valuation allowance 68,100    
Deferred tax asset related to NOLs 220,500    
Holding Company and First Management [Member]      
Income Tax Contingency [Line Items]      
Valuation allowance $ 32,600