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Investment Securities (Gross realize gains and losses by category) (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Schedule of Available-for-sale Securities [Line Items]      
Sale Price $ 300,483 $ 103,831 $ 214,518
Book Value 288,276 101,259 210,152
Available-for-sale Securities, Gross Realized Gains 16,324 2,572 4,366
Available-for-sale Securities, Gross Realized Losses 4,117 0 0
Collateralized Mortgage Backed Securities [Member]      
Schedule of Available-for-sale Securities [Line Items]      
Sale Price 293,505 103,831 214,518
Book Value 277,181 101,259 210,152
Available-for-sale Securities, Gross Realized Gains 16,324 2,572 4,366
Available-for-sale Securities, Gross Realized Losses 0 0 0
Collateralized Mortgage Backed Securities [Member] | FNMA and FHLMC [Member]      
Schedule of Available-for-sale Securities [Line Items]      
Sale Price 293,505 40,307 115,158
Book Value 277,181 37,736 110,792
Available-for-sale Securities, Gross Realized Gains 16,324 2,571 4,366
Available-for-sale Securities, Gross Realized Losses 0 0 0
Collateralized Mortgage Backed Securities [Member] | GNMA [Member]      
Schedule of Available-for-sale Securities [Line Items]      
Sale Price   63,524 99,360
Book Value   63,523 99,360
Available-for-sale Securities, Gross Realized Gains   1 0
Available-for-sale Securities, Gross Realized Losses   $ 0 $ 0
Securities Investment [Member]      
Schedule 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] | Obligations of Puerto Rico Government and Public Instrumentalities      
Schedule 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