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Investment Securities (Narrative) (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
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 $ 714,900   $ 714,900      
Investments Guaranteed by Puerto Rico Government and its Political Subdivisions in Unrealized Loss On Position $ 2,500   $ 2,500      
Investments Guaranteed By Us Treasury And Sponsored Agencies in Unrealized Loss Position Percentage To Total Investment in Unrealized Loss Position 99.70%   99.70%      
Investments Guaranteed By Puerto Rico Government and Its Political Subdivisions in Unrealized Loss Position Percentage To Total Investment in Unrealized Loss Position 0.30%   0.30%      
Maximum GovernmentBond Probability Of Default 6.60%   6.60%      
Money market investments $ 6,530   $ 6,530   $ 5,606  
Securitized GNMA pools retained, amortized cost $ 69,300 $ 71,800 $ 69,300 $ 71,800    
Securitized GNMA pool retained, yield 3.14% 2.99% 3.14% 2.99%    
Schedule of Available-for-sale Securities [Line Items]            
Available-for-sale securities sold , Book Value     $ 250,100 $ 288,276    
Gain (Loss) on Sale of Securities, Net $ 4 $ 0 6,896 12,207    
Other Than Temporary Impairment Credit Losses Recognized In Earnings Credit Losses On Debt Securities Held 0 $ 0 0 0 $ 0 $ 1,490
Investments Guaranteed By Local Government And Its Political Subdivisions In Unrealized Loss On Position with Cumulative Default Probability Fair Value $ 2,200   2,200      
Collateralized Mortgage Backed Securities [Member]            
Schedule of Available-for-sale Securities [Line Items]            
Available-for-sale securities sold , Book Value     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     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     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       $ 11,095    
US Treasury Securities            
Schedule of Available-for-sale Securities [Line Items]            
Available-for-sale securities sold , Book Value     $ 84,085