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Investments (Aggregate Values and Unrealized Gains and Losses) (Details) (USD $)
In Thousands, unless otherwise specified
Sep. 30, 2012
Dec. 31, 2011
Sep. 30, 2011
Investment securities available for sale      
Cost $ 4,969,135 $ 4,029,858 $ 3,965,995
Gross Unrealized Gains 43,347 28,454 31,463
Gross Unrealized Losses 441 1,889 2,633
Fair Value 5,012,041 4,056,423 3,994,825
Investment securities held to maturity      
Cost 1,459 [1] 1,822 [2] 1,943 [1]
U. S. Treasury
     
Investment securities available for sale      
Cost 872,411 887,041 986,507
Gross Unrealized Gains 409 808 1,427
Gross Unrealized Losses 30 30 0
Fair Value 872,790 887,819 987,934
Government Agency
     
Investment securities available for sale      
Cost 2,656,974 2,591,974 2,261,000
Gross Unrealized Gains 3,851 1,747 2,344
Gross Unrealized Losses 78 1,512 2,435
Fair Value 2,660,747 2,592,209 2,260,909
Corporate Bonds
     
Investment securities available for sale      
Cost 50,826 250,476 401,048
Gross Unrealized Gains 243 2,344 3,595
Gross Unrealized Losses 0 0 0
Fair Value 51,069 252,820 404,643
Residential Mortgage-Backed Securities
     
Investment securities available for sale      
Cost 1,387,482 298,402 315,474
Gross Unrealized Gains 20,622 9,165 8,916
Gross Unrealized Losses 333 346 198
Fair Value 1,407,771 307,221 324,192
Investment securities held to maturity      
Cost 1,459 1,822 1,943
Gross Unrealized Gains 151 184 191
Gross Unrealized Losses 27 26 26
Fair Value 1,583 1,980 2,108
Equity Securities
     
Investment securities available for sale      
Cost 841 939 939
Gross Unrealized Gains 18,215 14,374 15,165
Gross Unrealized Losses 0 0 0
Fair Value 19,056 15,313 16,104
State, County and Municipal
     
Investment securities available for sale      
Cost 601 1,026 1,027
Gross Unrealized Gains 7 16 16
Gross Unrealized Losses 0 1 0
Fair Value $ 608 $ 1,041 $ 1,043
[1] Unaudited
[2] Derived from 2011 Annual Report on Form 10-K.