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Investment Securities (Details 3) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2014
Dec. 31, 2013
Available for sale:    
Fair value, less than 12 months $ 1,078,371 $ 2,534,354
Unrealized losses, less than 12 months (24,016) (101,585)
Fair value, 12 months or more 1,774,278 434,554
Unrealized losses, 12 months or more (78,912) (31,534)
Fair value, total 2,852,649 2,968,908
Unrealized losses, total (102,928) (133,119)
Residential mortgage-backed securities
    
Available for sale:    
Fair value, less than 12 months 1,028,459 2,459,565
Unrealized losses, less than 12 months (22,666) (98,022)
Fair value, 12 months or more 1,747,859 420,262
Unrealized losses, 12 months or more (73,131) (26,552)
Fair value, total 2,776,318 2,879,827
Unrealized losses, total (95,797) (124,574)
Obligations of states and political subdivisions
    
Available for sale:    
Fair value, less than 12 months 35,096 55,327
Unrealized losses, less than 12 months (1,166) (3,025)
Fair value, 12 months or more 22,377 14,292
Unrealized losses, 12 months or more (5,574) (4,982)
Fair value, total 57,473 69,619
Unrealized losses, total (6,740) (8,007)
Equity Securities
    
Available for sale:    
Fair value, less than 12 months 14,816 19,462
Unrealized losses, less than 12 months (184) (538)
Fair value, 12 months or more 4,042  
Unrealized losses, 12 months or more (207)  
Fair value, total 18,858 19,462
Unrealized losses, total $ (391) $ (538)