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Investment Securities (Gross realize gains and losses by category) (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Schedule of Sale of Available-for-sale Securities [Line Items]      
Sale Price $ 256,996 $ 300,483 $ 103,831
Book Value 250,100 288,276 101,259
Available-for-sale Securities, Gross Realized Gains 6,896 16,324 2,572
Available-for-sale Securities, Gross Realized Losses 0 4,117 0
Collateralized Mortgage Backed Securities [Member]      
Schedule of Sale of Available-for-sale Securities [Line Items]      
Sale Price 172,794 293,505 103,831
Book Value 166,015 277,181 101,259
Available-for-sale Securities, Gross Realized Gains 6,779 16,324 2,572
Available-for-sale Securities, Gross Realized Losses 0 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 40,307
Book Value 102,311 277,181 37,736
Available-for-sale Securities, Gross Realized Gains 5,199 16,324 2,571
Available-for-sale Securities, Gross Realized Losses 0 0 0
Collateralized Mortgage Backed Securities [Member] | GNMA [Member]      
Schedule of Sale of Available-for-sale Securities [Line Items]      
Sale Price 65,284   63,524
Book Value 63,704   63,523
Available-for-sale Securities, Gross Realized Gains 1,580   1
Available-for-sale Securities, Gross Realized Losses 0   $ 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