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INVESTMENT SECURITIES - Additional Information (Detail) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Jun. 30, 2017
Mar. 31, 2017
Sep. 30, 2016
Jun. 30, 2016
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Schedule Of Investments [Line Items]                
Proceeds from sale of available-for-sale securities         $ 47,805 $ 23,408 $ 219,780  
Amortized cost         1,975,230 1,903,878    
Net impairment losses on available-for-sale debt securities         50 12,231 6,687  
Fair value         1,942,568 1,891,016    
Other Debt Obligations [Member]                
Schedule Of Investments [Line Items]                
Equity Securities, FV-NI         400      
Amortized cost         500 100    
Fair value         500 100    
Available-for-sale Securities [Member]                
Schedule Of Investments [Line Items]                
Equity Securities, FV-NI         $ (400)      
Percentage Of Debt Securities Government And Government Sponsored Agencies         99.00%      
Proceeds from sale of available-for-sale securities         $ 47,800 23,400 219,800  
Other Than Temporary Impairment Credit Losses Recognized In Earnings Credit Losses On Debt Securities Held         6,842 6,792 28,981 $ 22,294
Available-for-sale Securities [Member] | PRHFA [Member] | Zero-coupon bonds [Member]                
Schedule Of Investments [Line Items]                
Amortized cost         8,200      
Fair value         7,000      
Available-for-sale Securities [Member] | Puerto Rico-government obligations [Member] | PUERTO RICO [Member]                
Schedule Of Investments [Line Items]                
Default Rate     100.00%          
Available-for-sale Securities [Member] | Puerto Rico-government obligations [Member] | PUERTO RICO [Member] | Minimum [Member]                
Schedule Of Investments [Line Items]                
Recovery Rate   15.00%            
Available-for-sale Securities [Member] | Puerto Rico-government obligations [Member] | PUERTO RICO [Member] | Maximum [Member]                
Schedule Of Investments [Line Items]                
Recovery Rate   80.00%            
Available-for-sale Securities [Member] | Puerto Rico-government obligations [Member] | PUERTO RICO [Member] | Weighted Average [Member]                
Schedule Of Investments [Line Items]                
Recovery Rate   41.00%            
Available-for-sale Securities [Member] | Puerto Rico-government obligations [Member] | PUERTO RICO [Member] | Accumulated Other-than-Temporary Impairment Attributable to Parent [Member]                
Schedule Of Investments [Line Items]                
Proceeds from sale of available-for-sale securities $ 23,400              
Amortized cost 23,000              
Other Than Temporary Impairment Credit Losses Recognized In Earnings Credit Losses On Debt Securities Held 34,400              
Gain on Sale of Investments 400              
Net impairment losses on available-for-sale debt securities $ 12,200     $ 6,300        
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         6,842 $ 6,792 6,792 $ 6,405
Net impairment losses on available-for-sale debt securities         $ 50   400  
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] | Private label MBS [Member] | FICO Score, Greater than 700 [Member] | LTV Less than 80 Percent [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] | U.S. agency MBS [Member]                
Schedule Of Investments [Line Items]                
Proceeds from sale of available-for-sale securities         $ 36,200   204,800  
Gain on Sale of Investments             6,100  
Loss on Sale of Investments         59      
Available-for-sale Securities [Member] | U S Treasury Securities [Member]                
Schedule Of Investments [Line Items]                
Proceeds from sale of available-for-sale securities             15,000  
Gain on Sale of Investments             $ 8  
Available-for-sale Securities [Member] | U.S. agency debt securities | Call Option [Member]                
Schedule Of Investments [Line Items]                
Proceeds from sale of available-for-sale securities         11,600      
Gain on Sale of Investments         22      
Available-for-sale Securities [Member] | Residential pass-through mortgage-backed securities [Member] | PRHFA [Member] | Zero-coupon bonds [Member]                
Schedule Of Investments [Line Items]                
Amortized cost         4,200      
Fair value         $ 2,800      
Held-to-maturity Securities [Member]                
Schedule Of Investments [Line Items]                
Percentage Of Held To Maturity Securities         70.00%