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Investment Securities (Narrative) (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Investments, Debt and Equity Securities [Abstract]        
Investments Guaranteed by US Treasury and Sponsored Agencies in Unrealized Loss on Position $ 894,200      
Investments Guaranteed by Puerto Rico Government and its Political Subdivisions in Unrealized Loss On Position $ 4,700      
Investments Guaranteed By Us Treasury And Sponsored Agencies in Unrealized Loss Position Percentage To Total Investment in Unrealized Loss Position 99.50%      
Investments Guaranteed By Puerto Rico Government and Its Political Subdivisions in Unrealized Loss Position Percentage To Total Investment in Unrealized Loss Position 0.50%      
Maximum GovernmentBond Probability Of Default 7.70%      
Money market investments $ 5,606 $ 4,699    
Securitized GNMA pools, amortized cost $ 112,200      
Securitized GNMA pool, yield 2.89%      
Schedule of Available-for-sale Securities [Line Items]        
Available-for-sale securities, Book Value $ 288,276 101,259 $ 210,152  
Gain (Loss) on Sale of Securities, Net 12,207 2,572 4,366  
Other Than Temporary Impairment Credit Losses Recognized In Earnings Credit Losses On Debt Securities Held 0 1,490 0 $ 0
Investments Guaranteed By Local Government And Its Political Subdivisions In Unrealized Loss On Position with Cumulative Default Probability Fair Value $ 4,100      
Investments Guaranteed By Local Government And Its Political Subdivisions In Unrealized Loss Position Fair Vaue Percentage to Total Cost 87.00%      
Government Investment with Default Probability Payment Received $ 2,000      
Collateralized Mortgage Backed Securities [Member]        
Schedule of Available-for-sale Securities [Line Items]        
Available-for-sale securities, Book Value 277,181 101,259 210,152  
Collateralized Mortgage Backed Securities [Member] | FNMA and FHLMC [Member]        
Schedule of Available-for-sale Securities [Line Items]        
Available-for-sale securities, Book Value 277,181 37,736 110,792  
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, Book Value   $ 63,523 $ 99,360  
Securities Investment [Member]        
Schedule of Available-for-sale Securities [Line Items]        
Available-for-sale securities, Book Value 11,095      
Securities Investment [Member] | Obligations of Puerto Rico Government and Public Instrumentalities        
Schedule of Available-for-sale Securities [Line Items]        
Available-for-sale securities, Book Value $ 11,095