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Investments (Aggregate Values and Unrealized Gains and Losses) (Details) (USD $)
In Thousands, unless otherwise specified
Jun. 30, 2013
Dec. 31, 2012
Jun. 30, 2012
Investment securities available for sale      
Cost $ 5,191,635 $ 5,192,419 $ 4,606,093
Gross Unrealized Gains 26,762 34,517 29,721
Gross Unrealized Losses 33,421 708 1,566
Fair Value 5,184,976 5,226,228 4,634,248
Investment securities held to maturity      
Cost 1,130 [1] 1,342 [2] 1,578 [1]
U. S. Treasury
     
Investment securities available for sale      
Cost 598,625 823,241 878,692
Gross Unrealized Gains 248 403 149
Gross Unrealized Losses 207 12 156
Fair Value 598,666 823,632 878,685
Government Agency
     
Investment securities available for sale      
Cost 2,725,227 3,052,040 2,976,079
Gross Unrealized Gains 1,531 3,501 2,684
Gross Unrealized Losses 5,379 337 565
Fair Value 2,721,379 3,055,204 2,978,198
Corporate Bonds
     
Investment securities available for sale      
Cost     49,987
Gross Unrealized Gains     459
Gross Unrealized Losses     0
Fair Value     50,446
Mortgage Backed Securities, Other [Member]
     
Investment securities available for sale      
Cost 1,866,204 1,315,211 699,468
Gross Unrealized Gains 4,931 14,787 9,022
Gross Unrealized Losses 27,812 341 845
Fair Value 1,843,323 1,329,657 707,645
Investment securities held to maturity      
Cost 1,130 1,342 1,578
Gross Unrealized Gains 97 133 163
Gross Unrealized Losses 27 27 27
Fair Value 1,200 1,448 1,714
Equity Securities
     
Investment securities available for sale      
Cost 543 543 841
Gross Unrealized Gains 20,050 15,822 17,397
Gross Unrealized Losses 0 0 0
Fair Value 20,593 16,365 18,238
State, County and Municipal
     
Investment securities available for sale      
Cost 186 546 1,026
Gross Unrealized Gains 1 4 10
Gross Unrealized Losses 0 0 0
Fair Value 187 550 1,036
Other Debt Obligations
     
Investment securities available for sale      
Cost 850 838  
Gross Unrealized Gains 1 0  
Gross Unrealized Losses 23 18  
Fair Value $ 828 $ 820  
[1] Unaudited
[2] Derived from 2012 Annual Report on Form 10-K.