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INVESTMENT SECURITIES - Additional Information (Detail) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
May 17, 2017
Dec. 31, 2016
Schedule Of Investments [Line Items]                
Proceeds from sale of available-for-sale securities         $ 23,408 $ 219,780    
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         $ 172,493 270,345    
Total investment securities available for sale $ 1,750,472       1,750,472     $ 1,881,920
Impairement on equity securities 0     $ 6,096 371 6,104    
Fair value 1,750,472       1,750,472     1,881,920
Amortized cost $ 1,753,629       $ 1,753,629     $ 1,908,557
Weighted average yield 2.20%       2.20%     2.14%
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 $ 12,231 6,687    
Percentage Of Held To Maturity Securities 70.00%              
Interest Receivable $ 49,231       49,231     $ 45,453
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 Losses Investments Portion Recognized In Earnings Net           400    
Puerto Rico Government obligations [Member]                
Schedule Of Investments [Line Items]                
Other Than Temporary Impairment Losses Investments Portion Recognized In Earnings Net         $ 12,200 $ 6,300    
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]
For the nine-month periods ended September 30, 2017 and 2016, approximately $12.2 million and $6.3 million, respectively, of the credit impairment recognized in earnings consisted of credit losses on Puerto Rico Government debt securities that were sold in the second quarter of 2017, as further discussed below. For the nine-month period ended September 30, 2016, $0.4 million of the credit impairment recognized in earnings was associated with credit losses on private label MBS.