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Investment Securities (Gross realize gains and losses by category) (Details) - USD ($)
$ in Thousands
9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Schedule of Sale of Available-for-sale Securities [Line Items]    
Sale Price $ 256,996 $ 300,483
Book Value 250,100 288,276
Available-for-sale Securities, Gross Realized Gains 6,896 16,324
Available-for-sale Securities, Gross Realized Losses 0 4,117
Collateralized Mortgage Backed Securities [Member]    
Schedule of Sale of Available-for-sale Securities [Line Items]    
Sale Price 172,794 293,505
Book Value 166,015 277,181
Available-for-sale Securities, Gross Realized Gains 6,779 16,324
Available-for-sale Securities, Gross Realized Losses 0 0
Collateralized Mortgage Backed Securities [Member] | FNMA and FHLMC [Member]    
Schedule of Sale of Available-for-sale Securities [Line Items]    
Sale Price 107,510 293,505
Book Value 102,311 277,181
Available-for-sale Securities, Gross Realized Gains 5,199 16,324
Available-for-sale Securities, Gross Realized Losses 0 0
Collateralized Mortgage Backed Securities [Member] | GNMA [Member]    
Schedule of Sale of Available-for-sale Securities [Line Items]    
Sale Price 65,284  
Book Value 63,704  
Available-for-sale Securities, Gross Realized Gains 1,580  
Available-for-sale Securities, Gross Realized Losses 0  
Collateralized Mortgage Backed Securities [Member] | Obligations of Puerto Rico Government and Public Instrumentalities    
Schedule of Sale of Available-for-sale Securities [Line Items]    
Sale Price   6,978
Book Value   11,095
Available-for-sale Securities, Gross Realized Gains   0
Available-for-sale Securities, Gross Realized Losses   $ 4,117
Securities Investment [Member]    
Schedule of Sale of Available-for-sale Securities [Line Items]    
Sale Price 84,202  
Book Value 84,085  
Available-for-sale Securities, Gross Realized Gains 117  
Available-for-sale Securities, Gross Realized Losses 0  
Securities Investment [Member] | US Treasury Securities [Member]    
Schedule of Sale of Available-for-sale Securities [Line Items]    
Sale Price 84,202  
Book Value 84,085  
Available-for-sale Securities, Gross Realized Gains 117  
Available-for-sale Securities, Gross Realized Losses $ 0