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Investment Securities (Narrative) (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Investments, Debt and Equity Securities [Abstract]        
Investments Guaranteed by US Treasury and Sponsored Agencies in Unrealized Loss on Position $ 1,100      
Money market investments 4,930 $ 7,021    
Securitized GNMA pools retained, amortized cost $ 56,800 $ 74,900 $ 112,200  
Securitized GNMA pool retained, yield 3.93% 3.14% 2.89%  
Schedule of Available-for-sale Securities [Line Items]        
Available-for-sale securities sold , Book Value $ 17,837 $ 250,100 $ 288,276  
Gain (Loss) on Sale of Securities, Net 0 6,896 12,207  
Other Than Temporary Impairment Credit Losses Recognized In Earnings Credit Losses On Debt Securities Held 0 0 0 $ 1,490
Collateralized Mortgage Backed Securities [Member]        
Schedule of Available-for-sale Securities [Line Items]        
Available-for-sale securities sold , Book Value 17,837 166,015 277,181  
Collateralized Mortgage Backed Securities [Member] | FNMA and FHLMC [Member]        
Schedule of Available-for-sale Securities [Line Items]        
Available-for-sale securities sold , Book Value 0 102,311 277,181  
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 17,837 63,704    
US Treasury Securities        
Schedule of Available-for-sale Securities [Line Items]        
Available-for-sale securities sold , Book Value $ 0 $ 84,085 11,095  
US Treasury Securities | Obligations of Puerto Rico Government and Public Instrumentalities        
Schedule of Available-for-sale Securities [Line Items]        
Available-for-sale securities sold , Book Value     $ 11,095