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Investment Securities (Details 3) (USD $)
In Thousands, unless otherwise specified
Jun. 30, 2014
Dec. 31, 2013
Available for sale:    
Fair value, less than 12 Months $ 223,881 $ 2,534,354
Unrealized losses, less than 12 Months (971) (101,585)
Fair value, 12 Months or More 2,291,359 434,554
Unrealized losses, 12 Months or More (59,478) (31,534)
Fair value, total 2,515,240 2,968,908
Unrealized losses, total (60,449) (133,119)
Mortgage Backed Securities [Member]
    
Available for sale:    
Fair value, less than 12 Months 219,141 2,459,565
Unrealized losses, less than 12 Months (755) (98,022)
Fair value, 12 Months or More 2,240,363 420,262
Unrealized losses, 12 Months or More (53,636) (26,552)
Fair value, total 2,459,504 2,879,827
Unrealized losses, total (54,391) (124,574)
U S States And Political Subdivisions [Member]
    
Available for sale:    
Fair value, less than 12 Months 4,740 55,327
Unrealized losses, less than 12 Months (216) (3,025)
Fair value, 12 Months or More 40,487 14,292
Unrealized losses, 12 Months or More (5,601) (4,982)
Fair value, total 45,227 69,619
Unrealized losses, total (5,817) (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 10,509  
Unrealized losses, 12 Months or More (241)  
Fair value, total 10,509 19,462
Unrealized losses, total $ (241) $ (538)