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INVESTMENT SECURITIES - Additional Information (Detail) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Mar. 31, 2017
Jun. 30, 2018
Jun. 30, 2017
Mar. 31, 2018
Dec. 31, 2017
May 17, 2017
Dec. 31, 2016
Schedule Of Investments [Line Items]                  
Proceeds from sale of available-for-sale securities       $ 0 $ 23,408        
Percentage Of Debt Securities Government And Government Sponsored Agencies 99.00%     99.00%          
Maximum loan to value ratio       80.00%          
Proceeds From Maturities Prepayments And Calls Of Available For Sale Securities       $ 174,574 119,664        
Total investment securities available for sale $ 2,036,010     2,036,010     $ 1,891,016    
Impairement on equity securities 0 $ 371   0 371        
Fair value 2,036,010     2,036,010     1,891,016    
Amortized cost $ 2,080,364     $ 2,080,364     $ 1,903,878    
Weighted average yield 2.44%     2.44%     2.27%    
Other than Temporary Impairment Losses, Investments, Available-for-sale Securities, Portion Recognized in Earnings, Net, Qualitative Disclosures, Default Rate     100.00%            
Other Than Temporary Impairment Losses Investments Portion Recognized In Earnings Net [1] $ 0 0   $ 0 12,231        
Percentage Of Held To Maturity Securities 70.00%                
Interest Receivable $ 47,171     47,171     $ 57,172    
Other Than Temporary Impairment Credit Losses Recognized In Earnings Credit Losses On Debt Securities Held   6,792 $ 41,212   6,792       $ 28,981
Maximum [Member]                  
Schedule Of Investments [Line Items]                  
Other than Temporary Impairment Losses, Investments, Available-for-sale Securities, Portion Recognized in Earnings, Net, Qualitative Disclosures, Recovery Rate     80.00%            
Minimum [Member]                  
Schedule Of Investments [Line Items]                  
Other than Temporary Impairment Losses, Investments, Available-for-sale Securities, Portion Recognized in Earnings, Net, Qualitative Disclosures, Recovery Rate     15.00%            
Weighted Average [Member]                  
Schedule Of Investments [Line Items]                  
Other than Temporary Impairment Losses, Investments, Available-for-sale Securities, Portion Recognized in Earnings, Net, Qualitative Disclosures, Recovery Rate     41.00%            
Mortgage Backed Securities Issued By Private Enterprises [Member]                  
Schedule Of Investments [Line Items]                  
Other Than Temporary Impairment Credit Losses Recognized In Earnings Credit Losses On Debt Securities Held 6,792 6,792 $ 6,792 6,792 6,792 $ 6,792 6,792   6,792
Puerto Rico Government obligations [Member]                  
Schedule Of Investments [Line Items]                  
Other Than Temporary Impairment Credit Losses Recognized In Earnings Credit Losses On Debt Securities Held $ 0 0 $ 34,420 $ 0 $ 0   $ 0   $ 22,189
Puerto Rico Government obligations [Member] | Puerto Rico Government Debt Securities Other Than Temporary Impairment [Member]                  
Schedule Of Investments [Line Items]                  
Proceeds from sale of available-for-sale securities   $ 23,400              
Amortized cost               $ 23,000  
[1]
Credit losses on Puerto Rico government debt securities, recorded in the first quarter of 2017.