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Investment Securities (Gross realize gains and losses by category) (Details)
$ in Thousands
6 Months Ended
Jun. 30, 2017
USD ($)
Schedule of Sale of Available-for-sale Securities [Line Items]  
Sale Price $ 212,203
Book Value 205,312
Available-for-sale Securities, Gross Realized Gains 6,891
Available-for-sale Securities, Gross Realized Losses 0
Collateralized Mortgage Backed Securities [Member]  
Schedule of Sale of Available-for-sale Securities [Line Items]  
Sale Price 172,794
Book Value 166,015
Available-for-sale Securities, Gross Realized Gains 6,779
Available-for-sale Securities, Gross Realized Losses 0
Collateralized Mortgage Backed Securities [Member] | FNMA and FHLMC [Member]  
Schedule of Sale of Available-for-sale Securities [Line Items]  
Sale Price 107,510
Book Value 102,311
Available-for-sale Securities, Gross Realized Gains 5,199
Available-for-sale Securities, Gross Realized Losses 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 39,409
Book Value 39,297
Available-for-sale Securities, Gross Realized Gains 112
Available-for-sale Securities, Gross Realized Losses 0
Securities Investment [Member]  
Schedule of Sale of Available-for-sale Securities [Line Items]  
Sale Price 39,409
Book Value 39,297
Available-for-sale Securities, Gross Realized Gains 112
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 39,409
Book Value 39,297
Available-for-sale Securities, Gross Realized Gains 112
Available-for-sale Securities, Gross Realized Losses $ 0