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Investment with an Unrealized Loss Position (Details) (USD $)
In Thousands, unless otherwise specified
Jun. 30, 2014
Dec. 31, 2013
Available-for-Sale, Fair Value    
Fair Value, Less than 12 Months $ 127,720 $ 995,941
Fair Value, 12 Months or More 374,900 77,856
Fair Value, Total 502,620 1,073,797
Available-for-Sale, Unrealized Loss    
Unrealized Loss, Less than 12 Months (949) (29,736)
Unrealized Loss, 12 Months or More (7,069) (6,177)
Unrealized Loss, Total (8,018) (35,913)
Held-to-Maturity, Fair Value    
Fair Value, Less than 12 Months 2,321  
Fair Value, 12 Months or More 92,583  
Fair Value, Total 94,904  
Held-to-Maturity, Unrealized Loss    
Unrealized Loss, Less than 12 Months (19)  
Unrealized Loss, 12 Months or More (4,113)  
Unrealized Loss, Total (4,132)  
U.S. government sponsored enterprises
   
Available-for-Sale, Fair Value    
Fair Value, Less than 12 Months 24 3
Fair Value, 12 Months or More 0 0
Fair Value, Total 24 3
Available-for-Sale, Unrealized Loss    
Unrealized Loss, Less than 12 Months 0 0
Unrealized Loss, 12 Months or More 0 0
Unrealized Loss, Total 0 0
State and local governments
   
Available-for-Sale, Fair Value    
Fair Value, Less than 12 Months 28,648 408,812
Fair Value, 12 Months or More 164,492 74,161
Fair Value, Total 193,140 482,973
Available-for-Sale, Unrealized Loss    
Unrealized Loss, Less than 12 Months (184) (17,838)
Unrealized Loss, 12 Months or More (4,085) (6,052)
Unrealized Loss, Total (4,269) (23,890)
Held-to-Maturity, Fair Value    
Fair Value, Less than 12 Months 2,321  
Fair Value, 12 Months or More 92,583  
Fair Value, Total 94,904  
Held-to-Maturity, Unrealized Loss    
Unrealized Loss, Less than 12 Months (19)  
Unrealized Loss, 12 Months or More (4,113)  
Unrealized Loss, Total (4,132)  
Corporate bonds
   
Available-for-Sale, Fair Value    
Fair Value, Less than 12 Months 8,004 129,515
Fair Value, 12 Months or More 12,383 1,702
Fair Value, Total 20,387 131,217
Available-for-Sale, Unrealized Loss    
Unrealized Loss, Less than 12 Months (46) (1,672)
Unrealized Loss, 12 Months or More (72) (86)
Unrealized Loss, Total (118) (1,758)
Residential mortgage-backed securities
   
Available-for-Sale, Fair Value    
Fair Value, Less than 12 Months 91,044 457,611
Fair Value, 12 Months or More 198,025 1,993
Fair Value, Total 289,069 459,604
Available-for-Sale, Unrealized Loss    
Unrealized Loss, Less than 12 Months (719) (10,226)
Unrealized Loss, 12 Months or More (2,912) (39)
Unrealized Loss, Total $ (3,631) $ (10,265)