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Investment Securities (Narrative) (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Dec. 31, 2017
Investments, Debt and Equity Securities [Abstract]          
Investments Guaranteed by US Treasury and Sponsored Agencies in Unrealized Loss on Position $ 1,200   $ 1,200    
Investments Guaranteed by Puerto Rico Government and its Political Subdivisions in Unrealized Loss On Position 2,500   2,500    
Money market investments 6,991   6,991   $ 7,021
Securitized GNMA pools retained, amortized cost $ 37,600 $ 49,800 $ 37,600 $ 49,800  
Securitized GNMA pool retained, yield 3.45% 3.15% 3.45% 3.15%  
Schedule of Available-for-sale Securities [Line Items]          
Available-for-sale securities sold , Book Value       $ 205,312  
Gain (Loss) on Sale of Securities, Net $ 0 $ 6,891 $ 0 6,891  
Investments Guaranteed By Local Government And Its Political Subdivisions In Unrealized Loss On Position with Cumulative Default Probability Fair Value $ 2,500   $ 2,500    
Collateralized Mortgage Backed Securities [Member]          
Schedule of Available-for-sale Securities [Line Items]          
Available-for-sale securities sold , Book Value       166,015  
Collateralized Mortgage Backed Securities [Member] | FNMA and FHLMC [Member]          
Schedule of Available-for-sale Securities [Line Items]          
Available-for-sale securities sold , Book Value       102,311  
Collateralized Mortgage Backed Securities [Member] | Government National Mortgage Association Certificates and Obligations (GNMA) [Member]          
Schedule of Available-for-sale Securities [Line Items]          
Available-for-sale securities sold , Book Value       63,704  
Collateralized Mortgage Backed Securities [Member] | Obligations of Puerto Rico Government and Public Instrumentalities          
Schedule of Available-for-sale Securities [Line Items]          
Available-for-sale securities sold , Book Value       39,297  
US Treasury Securities          
Schedule of Available-for-sale Securities [Line Items]          
Available-for-sale securities sold , Book Value       $ 39,297