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Investments (Aggregate Values and Unrealized Gains and Losses) (Details) (USD $)
Dec. 31, 2013
Dec. 31, 2012
Schedule of Investments [Line Items]    
Investment securities, aggregate fair value, continuous unrealized losses of more than 12 months $ 56,800,000  
Investment securities available for sale    
Cost 5,404,335,000 5,192,419,000
Gross Unrealized Gains 28,188,000 34,517,000
Available For Sale Securities Gross Unrealized Loss Accumulated In Investments 44,820,000 708,000
Fair Value 5,387,703,000 5,226,228,000
Investment securities held to maturity    
Cost 907,000 1,342,000
Investment securities, aggregate unrealized loss, continuous unrealized losses of more than 12 months 1,100,000  
U. S. Treasury
   
Investment securities available for sale    
Cost 373,223,000 823,241,000
Gross Unrealized Gains 259,000 403,000
Available For Sale Securities Gross Unrealized Loss Accumulated In Investments 45,000 12,000
Fair Value 373,437,000 823,632,000
Government Agency
   
Investment securities available for sale    
Cost 2,543,223,000 3,052,040,000
Gross Unrealized Gains 1,798,000 3,501,000
Available For Sale Securities Gross Unrealized Loss Accumulated In Investments 792,000 337,000
Fair Value 2,544,229,000 3,055,204,000
Mortgage Backed Securities, Other [Member]
   
Investment securities available for sale    
Cost 2,486,297,000 1,315,211,000
Gross Unrealized Gains 4,526,000 14,787,000
Available For Sale Securities Gross Unrealized Loss Accumulated In Investments 43,950,000 341,000
Fair Value 2,446,873,000 1,329,657,000
Investment securities held to maturity    
Cost 907,000 1,342,000
Held To Maturity Securities Accumulated Unrecognized Holding Gain 67,000 133,000
Held To Maturity Securities Accumulated Unrecognized Holding Loss 0 27,000
Fair Value 974,000 1,448,000
Equity Securities
   
Investment securities available for sale    
Cost 543,000 543,000
Gross Unrealized Gains 21,604,000 15,822,000
Available For Sale Securities Gross Unrealized Loss Accumulated In Investments 0 0
Fair Value 22,147,000 16,365,000
State, County and Municipal
   
Investment securities available for sale    
Cost 186,000 546,000
Gross Unrealized Gains 1,000 4,000
Available For Sale Securities Gross Unrealized Loss Accumulated In Investments 0 0
Fair Value 187,000 550,000
Other Debt Obligations
   
Investment securities available for sale    
Cost 863,000 838,000
Gross Unrealized Gains 0 0
Available For Sale Securities Gross Unrealized Loss Accumulated In Investments 33,000 18,000
Fair Value $ 830,000 $ 820,000