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Investment Securities (Narrative) (Details) (USD $)
In Millions, unless otherwise specified
Sep. 30, 2014
Dec. 31, 2013
Investments, Debt and Equity Securities [Abstract]    
Fair value of securities held as collateral   $ 64.6
Puerto Rico Government obligation with mandatory tender offer repaid by user   98.7
Investments Guaranteed by US Treasury and Sponsored Agencies in Unrealized Loss on Position 479.0  
Investments Guaranteed by Puerto Rico Government and its Political Subdivisions in Unrealized Loss On Position $ 20.9  
Investments Guaranteed By Us Treasury And Sponsored Agencies in Unrealized Loss Position Percentage To Total Investment in Unrealized Loss Position 96.00%  
Investments Guaranteed By Puerto Rico Government and Its Political Subdivisions in Unrealized Loss Position Percentage To Total Investment in Unrealized Loss Position 4.00%  
Minimum Government Bond Probability of Default 2.509%  
Maximum GovernmentBond Probability Of Default 15.34%  
Minimum Government Bond Recovery Rate 84.66%  
Maximum Government Bond Recovery Rate 97.491%