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INVESTMENT SECURITIES - Additional Information (Detail) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Sep. 30, 2016
Sep. 30, 2018
Sep. 30, 2017
Jun. 30, 2018
Dec. 31, 2017
Dec. 31, 2016
Schedule Of Investments [Line Items]                    
Proceeds from sale of available-for-sale securities           $ 0 $ 23,408      
Amortized cost $ 2,066,355         $ 2,066,355     $ 1,903,878  
Available for sale Securities [Member]                    
Schedule Of Investments [Line Items]                    
Percentage Of Debt Securities Government And Government Sponsored Agencies 99.00%         99.00%        
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 $ 28,981
Other Than Temporary Impairment Credit Losses Recognized In Earnings Additions Additional Credit Losses 0 0       0 12,231      
Available for sale Securities [Member] | 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 34,400       0     22,189
Other Than Temporary Impairment Credit Losses Recognized In Earnings Additions Additional Credit Losses       $ 12,200     12,231      
Other than Temporary Impairment Losses, Investments, Available-for-sale Securities, Portion Recognized in Earnings, Net, Qualitative Disclosures, Default Rate         100.00%          
Available for sale Securities [Member] | Private label MBS [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
Other Than Temporary Impairment Credit Losses Recognized In Earnings Additions Additional Credit Losses $ 0 $ 0       $ 0 $ 0      
Loans Receivable, Description of Variable Rate Basis           The interest rate on these private-label MBS is variable, tied to 3-month LIBOR and limited to the weighted-average coupon on the underlying collateral.        
Available for sale Securities [Member] | FICO Score, Greater than 700 [Member] | LTV Less than 80 Percent [Member] | Private label MBS [Member]                    
Schedule Of Investments [Line Items]                    
Financing Receivable, Credit Quality, Additional Information           The underlying mortgages are fixed-rate, single-family loans with original high FICO scores (over 700) and moderate loan-to-value ratios (under 80%), as well as moderate delinquency levels.        
Available for sale Securities [Member] | Minimum [Member] | Puerto Rico Government obligations [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%            
Available for sale Securities [Member] | Maximum [Member] | Puerto Rico Government obligations [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%            
Available for sale Securities [Member] | Weighted Average [Member] | Puerto Rico Government obligations [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%            
Available for sale Securities [Member] | Accumulated Other-than-Temporary Impairment Attributable to Parent [Member] | Puerto Rico | Puerto Rico Government obligations [Member]                    
Schedule Of Investments [Line Items]                    
Proceeds from sale of available-for-sale securities     23,400              
Amortized cost     $ 23,000              
Held-to-maturity Securities [Member]                    
Schedule Of Investments [Line Items]                    
Percentage Of Held To Maturity Securities 70.00%         70.00%