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Investments (Aggregate Values and Unrealized Gains and Losses) (Details) (USD $)
In Thousands, unless otherwise specified
Jun. 30, 2014
Dec. 31, 2013
Investment securities available for sale    
Cost $ 5,511,349 $ 5,404,335
Gross Unrealized Gains 44,311 28,188
Available For Sale Securities Gross Unrealized Loss Accumulated In Investments 17,494 44,820
Fair Value 5,538,166 5,387,703
Investment securities held to maturity    
Cost 693 907
U. S. Treasury
   
Investment securities available for sale    
Cost 1,623,564 373,223
Gross Unrealized Gains 2,084 259
Available For Sale Securities Gross Unrealized Loss Accumulated In Investments 18 45
Fair Value 1,625,630 373,437
Government Agency
   
Investment securities available for sale    
Cost 1,281,724 2,543,223
Gross Unrealized Gains 2,020 1,798
Available For Sale Securities Gross Unrealized Loss Accumulated In Investments 178 792
Fair Value 1,283,566 2,544,229
Mortgage Backed Securities, Other [Member]
   
Investment securities available for sale    
Cost 2,605,333 2,486,297
Gross Unrealized Gains 8,251 4,526
Available For Sale Securities Gross Unrealized Loss Accumulated In Investments 17,298 43,950
Fair Value 2,596,286 2,446,873
Investment securities held to maturity    
Cost 693 907
Held To Maturity Securities Accumulated Unrecognized Holding Gain 36 67
Held To Maturity Securities Accumulated Unrecognized Holding Loss 0 0
Fair Value 729 974
Equity Securities
   
Investment securities available for sale    
Cost 543 543
Gross Unrealized Gains 31,955 21,604
Available For Sale Securities Gross Unrealized Loss Accumulated In Investments 0 0
Fair Value 32,498 22,147
State, County and Municipal
   
Investment securities available for sale    
Cost 185 186
Gross Unrealized Gains 1 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   863
Gross Unrealized Gains   0
Available For Sale Securities Gross Unrealized Loss Accumulated In Investments   33
Fair Value   $ 830