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Investment Securities (Gross realize gains and losses by category) (Details) - USD ($)
$ in Thousands
9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Schedule of Sale of Available-for-sale Securities [Line Items]    
Sale Price $ 14,746 $ 256,996
Book Value 14,746 250,100
Available-for-sale Securities, Gross Realized Gains 0 6,896
Available-for-sale Securities, Gross Realized Losses 0 0
Collateralized Mortgage Backed Securities [Member]    
Schedule of Sale of Available-for-sale Securities [Line Items]    
Sale Price 14,746 172,794
Book Value 14,746 166,015
Available-for-sale Securities, Gross Realized Gains 0 6,779
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 0 107,510
Book Value 0 102,311
Available-for-sale Securities, Gross Realized Gains 0 5,199
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 14,746 65,284
Book Value 14,746 63,704
Available-for-sale Securities, Gross Realized Gains 0 1,580
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   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]    
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] | 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