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Investment Securities (Narrative) (Details)
$ in Millions
Mar. 31, 2016
USD ($)
Investments, Debt and Equity Securities [Abstract]  
Investments Guaranteed by US Treasury and Sponsored Agencies in Unrealized Loss on Position $ 197.3
Investments Guaranteed by Puerto Rico Government and its Political Subdivisions in Unrealized Loss On Position $ 6.7
Investments Guaranteed By Us Treasury And Sponsored Agencies in Unrealized Loss Position Percentage To Total Investment in Unrealized Loss Position 97.00%
Investments Guaranteed By Puerto Rico Government and Its Political Subdivisions in Unrealized Loss Position Percentage To Total Investment in Unrealized Loss Position 3.00%
Minimum Government Bond Probability of Default 8.81%
Investments Guaranteed By Local Government And Its Political Subdivisions In Unrealized Loss On Position with Default Probability $ 6.7
Securitized GNMA pools $ 23.0
Securitized GNMA pool, yield 3.06%