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Investments (Aggregate Values and Unrealized Gains and Losses) (Details) (USD $)
In Thousands, unless otherwise specified
Sep. 30, 2013
Dec. 31, 2012
Investment securities available for sale    
Cost $ 5,164,774 $ 5,192,419
Gross Unrealized Gains 28,826 34,517
Available For Sale Securities Gross Unrealized Loss Accumulated In Investments 32,015 708
Fair Value 5,161,585 [1] 5,226,228 [2]
Investment securities held to maturity    
Cost 1,013 [1] 1,342 [2]
U. S. Treasury
   
Investment securities available for sale    
Cost 448,201 823,241
Gross Unrealized Gains 372 403
Available For Sale Securities Gross Unrealized Loss Accumulated In Investments 41 12
Fair Value 448,532 823,632
Government Agency
   
Investment securities available for sale    
Cost 2,583,888 3,052,040
Gross Unrealized Gains 2,320 3,501
Available For Sale Securities Gross Unrealized Loss Accumulated In Investments 1,428 337
Fair Value 2,584,780 3,055,204
Mortgage Backed Securities, Other [Member]
   
Investment securities available for sale    
Cost 2,131,099 1,315,211
Gross Unrealized Gains 5,452 14,787
Available For Sale Securities Gross Unrealized Loss Accumulated In Investments 30,519 341
Fair Value 2,106,032 1,329,657
Investment securities held to maturity    
Cost 1,013 1,342
Held To Maturity Securities Accumulated Unrecognized Holding Gain 67 133
Held To Maturity Securities Accumulated Unrecognized Holding Loss 0 27
Fair Value 1,080 1,448
Equity Securities
   
Investment securities available for sale    
Cost 543 543
Gross Unrealized Gains 20,681 15,822
Available For Sale Securities Gross Unrealized Loss Accumulated In Investments 0 0
Fair Value 21,224 16,365
State, County and Municipal
   
Investment securities available for sale    
Cost 186 546
Gross Unrealized Gains 1 4
Available For Sale Securities Gross Unrealized Loss Accumulated In Investments 0 0
Fair Value 187 550
Other Debt Obligations
   
Investment securities available for sale    
Cost 857 838
Gross Unrealized Gains 0 0
Available For Sale Securities Gross Unrealized Loss Accumulated In Investments 27 18
Fair Value $ 830 $ 820
[1] Unaudited
[2] Derived from 2012 Annual Report on Form 10-K.