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Investment with an Unrealized Loss Position (Details) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2014
Dec. 31, 2013
Available-for-Sale, Fair Value    
Fair Value, Less than 12 Months $ 494,105 $ 995,941
Fair Value, 12 Months or More 227,412 77,856
Fair Value, Total 721,517 1,073,797
Available-for-Sale, Unrealized Loss    
Unrealized Loss, Less than 12 Months (9,506) (29,736)
Unrealized Loss, 12 Months or More (6,496) (6,177)
Unrealized Loss, Total (16,002) (35,913)
Held-to-Maturity, Fair Value    
Fair Value, Less than 12 Months 19,803  
Fair Value, 12 Months or More 75,916  
Fair Value, Total 95,719  
Held-to-Maturity, Unrealized Loss    
Unrealized Loss, Less than 12 Months (979)  
Unrealized Loss, 12 Months or More (5,100)  
Unrealized Loss, Total (6,079)  
U.S. government sponsored enterprises
   
Available-for-Sale, Fair Value    
Fair Value, Less than 12 Months 25 3
Fair Value, 12 Months or More 0 0
Fair Value, Total 25 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 155,418 408,812
Fair Value, 12 Months or More 77,090 74,161
Fair Value, Total 232,508 482,973
Available-for-Sale, Unrealized Loss    
Unrealized Loss, Less than 12 Months (4,861) (17,838)
Unrealized Loss, 12 Months or More (3,490) (6,052)
Unrealized Loss, Total (8,351) (23,890)
Held-to-Maturity, Fair Value    
Fair Value, Less than 12 Months 19,803  
Fair Value, 12 Months or More 75,916  
Fair Value, Total 95,719  
Held-to-Maturity, Unrealized Loss    
Unrealized Loss, Less than 12 Months (979)  
Unrealized Loss, 12 Months or More (5,100)  
Unrealized Loss, Total (6,079)  
Corporate bonds
   
Available-for-Sale, Fair Value    
Fair Value, Less than 12 Months 65,131 129,515
Fair Value, 12 Months or More 17,722 1,702
Fair Value, Total 82,853 131,217
Available-for-Sale, Unrealized Loss    
Unrealized Loss, Less than 12 Months (536) (1,672)
Unrealized Loss, 12 Months or More (177) (86)
Unrealized Loss, Total (713) (1,758)
Residential mortgage-backed securities
   
Available-for-Sale, Fair Value    
Fair Value, Less than 12 Months 273,531 457,611
Fair Value, 12 Months or More 132,600 1,993
Fair Value, Total 406,131 459,604
Available-for-Sale, Unrealized Loss    
Unrealized Loss, Less than 12 Months (4,109) (10,226)
Unrealized Loss, 12 Months or More (2,829) (39)
Unrealized Loss, Total $ (6,938) $ (10,265)