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Investment Securities (Details 3) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2013
Dec. 31, 2012
Available for sale:    
Fair value, less than 12 months $ 2,534,354 $ 743,609
Unrealized losses, less than 12 months (101,585) (5,590)
Fair value, 12 months or more 434,554 43,353
Unrealized losses, 12 months or more (31,534) (12,254)
Fair value, total 2,968,908 786,962
Unrealized losses, total (133,119) (17,844)
Residential mortgage-backed securities
    
Available for sale:    
Fair value, less than 12 months 2,459,565 738,492
Unrealized losses, less than 12 months (98,022) (5,476)
Fair value, 12 months or more 420,262 32,860
Unrealized losses, 12 months or more (26,552) (10,557)
Fair value, total 2,879,827 771,352
Unrealized losses, total (124,574) (16,033)
Obligations of states and political subdivisions
    
Available for sale:    
Fair value, less than 12 months 55,327 5,117
Unrealized losses, less than 12 months (3,025) (114)
Fair value, 12 months or more 14,292 10,437
Unrealized losses, 12 months or more (4,982) (1,677)
Fair value, total 69,619 15,554
Unrealized losses, total (8,007) (1,791)
Equity Securities
    
Available for sale:    
Fair value, less than 12 months 19,462  
Unrealized losses, less than 12 months (538)  
Fair value, 12 months or more   56
Unrealized losses, 12 months or more   (20)
Fair value, total 19,462 56
Unrealized losses, total $ (538) $ (20)