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Investments (Details 4) (USD $)
In Thousands, unless otherwise specified
Sep. 30, 2012
Dec. 31, 2011
Investment securities continuous unrealized loss position    
Fair Value of Investment with Unrealized Losses, Less Than 12 months $ 32,504 $ 43,211
Gross Unrealized Loss, Less Than 12 Months 336 579
Fair Value of Investment with Unrealized Losses, 12 Months or Greater 5,399 10,610
Gross Unrealized Losses, 12 Months or Greater 322 1,231
Fair Value of Investment with Unrealized Losses, Total 37,903 53,821
Gross Unrealized Losses, Total 658 1,810
Total held-to-maturity securities [Member]
    
Investment securities continuous unrealized loss position    
Held-to-Maturity, Fair Value of Investments with Unrealized Losses, Less Than 12 Months 14,523 25,899
Held-to-Maturity, Gross Unrealized Losses, Less Than 12 Months 42 148
Held-to-Maturity, Fair Value of Investments with Unrealized Losses 12 Months or Greater 5,399 10,610
Held-to-Maturity, Gross Unrealized Losses, 12 Months or Greater 322 1,231
Held-to-Maturity, Fair Value of Investments with Unrealized Losses, Total 19,922 36,509
Held-to-Maturity, Gross Unrealized Losses, Total 364 1,379
Total held-to-maturity securities [Member] | Corporate bonds [Member]
    
Investment securities continuous unrealized loss position    
Held-to-Maturity, Fair Value of Investments with Unrealized Losses, Less Than 12 Months 4,676 23,063
Held-to-Maturity, Gross Unrealized Losses, Less Than 12 Months 8 130
Held-to-Maturity, Fair Value of Investments with Unrealized Losses, Total 4,676 23,063
Held-to-Maturity, Gross Unrealized Losses, Total 8 130
Total held-to-maturity securities [Member] | States and political subdivisions [Member]
    
Investment securities continuous unrealized loss position    
Held-to-Maturity, Fair Value of Investments with Unrealized Losses, Less Than 12 Months 9,847 2,291
Held-to-Maturity, Gross Unrealized Losses, Less Than 12 Months 34 3
Held-to-Maturity, Fair Value of Investments with Unrealized Losses 12 Months or Greater 3,000 5,718
Held-to-Maturity, Gross Unrealized Losses, 12 Months or Greater 16 357
Held-to-Maturity, Fair Value of Investments with Unrealized Losses, Total 12,847 8,009
Held-to-Maturity, Gross Unrealized Losses, Total 50 360
Total held-to-maturity securities [Member] | U.S. agency-based mortgage-backed securities [Member]
    
Investment securities continuous unrealized loss position    
Held-to-Maturity, Fair Value of Investments with Unrealized Losses 12 Months or Greater 137 1,012
Held-to-Maturity, Gross Unrealized Losses, 12 Months or Greater 8 44
Held-to-Maturity, Fair Value of Investments with Unrealized Losses, Total 137 1,012
Held-to-Maturity, Gross Unrealized Losses, Total 8 44
Total held-to-maturity securities [Member] | Asset-backed securities [Member]
    
Investment securities continuous unrealized loss position    
Held-to-Maturity, Fair Value of Investments with Unrealized Losses, Less Than 12 Months   545
Held-to-Maturity, Gross Unrealized Losses, Less Than 12 Months   15
Held-to-Maturity, Fair Value of Investments with Unrealized Losses 12 Months or Greater 2,262 3,880
Held-to-Maturity, Gross Unrealized Losses, 12 Months or Greater 298 830
Held-to-Maturity, Fair Value of Investments with Unrealized Losses, Total 2,262 4,425
Held-to-Maturity, Gross Unrealized Losses, Total 298 845
Total available-for-sale securities [Member]
    
Investment securities continuous unrealized loss position    
Available-for Sale, Fair value of Investments with Unrealized Losses, Less Than 12 Months 17,981 17,312
Available-for Sale, Gross Unrealized Losses, Less Than 12 Months 294 431
Available-for Sale, Fair Value of Investments with Unrealized Losses, Total 17,981 17,312
Available-for Sale, Gross Unrealized Losses, Total 294 431
Fair Value of Investment with Unrealized Losses, 12 Months or Greater      
Gross Unrealized Losses, 12 Months or Greater      
Total available-for-sale securities [Member] | Corporate bonds [Member]
    
Investment securities continuous unrealized loss position    
Available-for Sale, Fair value of Investments with Unrealized Losses, Less Than 12 Months 5,965 14,301
Available-for Sale, Gross Unrealized Losses, Less Than 12 Months 21 233
Available-for Sale, Fair Value of Investments with Unrealized Losses, Total 5,965 14,301
Available-for Sale, Gross Unrealized Losses, Total 21 233
Fair Value of Investment with Unrealized Losses, 12 Months or Greater      
Gross Unrealized Losses, 12 Months or Greater      
Total available-for-sale securities [Member] | States and political subdivisions [Member]
    
Investment securities continuous unrealized loss position    
Available-for Sale, Fair value of Investments with Unrealized Losses, Less Than 12 Months 1,322 222
Available-for Sale, Gross Unrealized Losses, Less Than 12 Months 51 1
Available-for Sale, Fair Value of Investments with Unrealized Losses, Total 1,322 222
Available-for Sale, Gross Unrealized Losses, Total 51 1
Fair Value of Investment with Unrealized Losses, 12 Months or Greater      
Gross Unrealized Losses, 12 Months or Greater      
Total available-for-sale securities [Member] | U.S. agency-based mortgage-backed securities [Member]
    
Investment securities continuous unrealized loss position    
Available-for Sale, Fair value of Investments with Unrealized Losses, Less Than 12 Months 7,867  
Available-for Sale, Gross Unrealized Losses, Less Than 12 Months 142  
Available-for Sale, Fair Value of Investments with Unrealized Losses, Total 7,867  
Available-for Sale, Gross Unrealized Losses, Total 142  
Fair Value of Investment with Unrealized Losses, 12 Months or Greater     
Gross Unrealized Losses, 12 Months or Greater     
Total available-for-sale securities [Member] | Equity Securities [Member]
    
Investment securities continuous unrealized loss position    
Available-for Sale, Fair value of Investments with Unrealized Losses, Less Than 12 Months 2,827 2,789
Available-for Sale, Gross Unrealized Losses, Less Than 12 Months 80 197
Available-for Sale, Fair Value of Investments with Unrealized Losses, Total 2,827 2,789
Available-for Sale, Gross Unrealized Losses, Total 80 197
Fair Value of Investment with Unrealized Losses, 12 Months or Greater      
Gross Unrealized Losses, 12 Months or Greater