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Investment Securities (Details 3) (USD $)
In Thousands, unless otherwise specified
Sep. 30, 2014
Dec. 31, 2013
Available for sale:    
Fair value, less than 12 Months $ 665,818 $ 2,534,354
Unrealized losses, less than 12 Months (3,378) (101,585)
Fair value, 12 Months or More 1,930,562 434,554
Unrealized losses, 12 Months or More (63,155) (31,534)
Fair value, total 2,596,380 2,968,908
Unrealized losses, total (66,533) (133,119)
Collateralized Mortgage Backed Securities [Member]
    
Available for sale:    
Fair value, less than 12 Months 664,223 2,459,565
Unrealized losses, less than 12 Months (3,327) (98,022)
Fair value, 12 Months or More 1,889,249 420,262
Unrealized losses, 12 Months or More (57,373) (26,552)
Fair value, total 2,553,472 2,879,827
Unrealized losses, total (60,700) (124,574)
US States and Political Subdivisions Debt Securities [Member]
    
Available for sale:    
Fair value, less than 12 Months 1,595 55,327
Unrealized losses, less than 12 Months (51) (3,025)
Fair value, 12 Months or More 30,833 14,292
Unrealized losses, 12 Months or More (5,512) (4,982)
Fair value, total 32,428 69,619
Unrealized losses, total (5,563) (8,007)
Equity Securities [Member]
    
Available for sale:    
Fair value, less than 12 Months   19,462
Unrealized losses, less than 12 Months   (538)
Fair value, 12 Months or More 10,480  
Unrealized losses, 12 Months or More (270)  
Fair value, total 10,480 19,462
Unrealized losses, total $ (270) $ (538)