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Investments (Aggregate Values and Unrealized Gains and Losses) (Details) (USD $)
In Thousands, unless otherwise specified
Jun. 30, 2012
Dec. 31, 2011
Jun. 30, 2011
Investment securities available for sale      
Cost $ 4,606,093 $ 4,029,858 $ 3,982,402
Gross Unrealized Gains 29,721 28,454 33,481
Gross Unrealized Losses 1,566 1,889 1,642
Fair Value 4,634,248 4,056,423 4,014,241
Investment securities held to maturity      
Cost 1,578 [1] 1,822 [2] 2,098 [1]
U. S. Treasury
     
Investment securities available for sale      
Cost 878,692 887,041 1,286,978
Gross Unrealized Gains 149 808 2,309
Gross Unrealized Losses 156 30 5
Fair Value 878,685 887,819 1,289,282
Government Agency
     
Investment securities available for sale      
Cost 2,976,079 2,591,974 1,904,135
Gross Unrealized Gains 2,684 1,747 1,848
Gross Unrealized Losses 565 1,512 1,140
Fair Value 2,978,198 2,592,209 1,904,843
Corporate Bonds
     
Investment securities available for sale      
Cost 49,987 250,476 461,756
Gross Unrealized Gains 459 2,344 5,258
Gross Unrealized Losses 0 0 43
Fair Value 50,446 252,820 466,971
Residential Mortgage-Backed Securities
     
Investment securities available for sale      
Cost 699,468 298,402 327,531
Gross Unrealized Gains 9,022 9,165 6,403
Gross Unrealized Losses 845 346 451
Fair Value 707,645 307,221 333,483
Investment securities held to maturity      
Cost 1,578 1,822 2,098
Gross Unrealized Gains 163 184 206
Gross Unrealized Losses 27 26 26
Fair Value 1,714 1,980 2,278
Equity Securities
     
Investment securities available for sale      
Cost 841 939 965
Gross Unrealized Gains 17,397 14,374 17,644
Gross Unrealized Losses 0 0 0
Fair Value 18,238 15,313 18,609
State, County and Municipal
     
Investment securities available for sale      
Cost 1,026 1,026 1,037
Gross Unrealized Gains 10 16 19
Gross Unrealized Losses 0 1 3
Fair Value $ 1,036 $ 1,041 $ 1,053
[1] Unaudited
[2] Derived from 2011 Annual Report on Form 10-K.