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Investment Securities (Gross realize gains and losses by category) (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Schedule of Sale of Available-for-sale Securities [Line Items]      
Sale Price $ 17,837 $ 256,996 $ 300,483
Book Value 17,837 250,100 288,276
Available-for-sale Securities, Gross Realized Gains 0 6,896 16,324
Available-for-sale Securities, Gross Realized Losses 0 0 4,117
Collateralized Mortgage Backed Securities [Member]      
Schedule of Sale of Available-for-sale Securities [Line Items]      
Sale Price 17,837 172,794 293,505
Book Value 17,837 166,015 277,181
Available-for-sale Securities, Gross Realized Gains 0 6,779 16,324
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 0 107,510 293,505
Book Value 0 102,311 277,181
Available-for-sale Securities, Gross Realized Gains 0 5,199 16,324
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 17,837 65,284  
Book Value 17,837 63,704  
Available-for-sale Securities, Gross Realized Gains 0 1,580  
Available-for-sale Securities, Gross Realized Losses 0 0  
Securities Investment [Member]      
Schedule of Sale of Available-for-sale Securities [Line Items]      
Sale Price 0 84,202 6,978
Book Value 0 84,085 11,095
Available-for-sale Securities, Gross Realized Gains 0 117 0
Available-for-sale Securities, Gross Realized Losses 0 0 4,117
Securities Investment [Member] | US Treasury Securities [Member]      
Schedule of Sale of Available-for-sale Securities [Line Items]      
Sale Price 0 84,202  
Book Value 0 84,085  
Available-for-sale Securities, Gross Realized Gains 0 117  
Available-for-sale Securities, Gross Realized Losses $ 0 $ 0  
Securities Investment [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