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Investments (Aggregate Values and Unrealized Gains and Losses) (Details) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2014
Dec. 31, 2013
Investment securities available for sale    
Cost $ 5,680,970 $ 5,404,335
Gross Unrealized Gains 29,684 28,188
Available For Sale Securities Gross Unrealized Loss Accumulated In Investments 34,417 44,820
Fair Value 5,676,237 5,387,703
Investment securities held to maturity    
Cost 782 907
U. S. Treasury
   
Investment securities available for sale    
Cost 1,274,716 373,223
Gross Unrealized Gains 379 259
Available For Sale Securities Gross Unrealized Loss Accumulated In Investments 1,874 45
Fair Value 1,273,221 373,437
Government Agency
   
Investment securities available for sale    
Cost 1,811,889 2,543,223
Gross Unrealized Gains 1,764 1,798
Available For Sale Securities Gross Unrealized Loss Accumulated In Investments 879 792
Fair Value 1,812,774 2,544,229
Mortgage Backed Securities, Other [Member]
   
Investment securities available for sale    
Cost 2,592,766 2,486,297
Gross Unrealized Gains 5,524 4,526
Available For Sale Securities Gross Unrealized Loss Accumulated In Investments 31,624 43,950
Fair Value 2,566,666 2,446,873
Investment securities held to maturity    
Cost 782 907
Held To Maturity Securities Accumulated Unrecognized Holding Gain 53 67
Held To Maturity Securities Accumulated Unrecognized Holding Loss 0 0
Fair Value 835 974
Equity Securities
   
Investment securities available for sale    
Cost 543 543
Gross Unrealized Gains 22,017 21,604
Available For Sale Securities Gross Unrealized Loss Accumulated In Investments 0 0
Fair Value 22,560 22,147
State, County and Municipal
   
Investment securities available for sale    
Cost 186 186
Gross Unrealized Gains 0 1
Available For Sale Securities Gross Unrealized Loss Accumulated In Investments 0 0
Fair Value 186 187
Other Debt Obligations
   
Investment securities available for sale    
Cost 870 863
Gross Unrealized Gains 0 0
Available For Sale Securities Gross Unrealized Loss Accumulated In Investments 40 33
Fair Value $ 830 $ 830