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Investments (Details 6) (USD $) In Thousands, unless otherwise specified | Dec. 31, 2012 | Dec. 31, 2011
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Investment securities continuous unrealized loss position |  |
Fair Value of Investments with Unrealized Losses, Less Than 12 months | $ 50,561 | $ 43,211
Gross Unrealized Loss, Less Than 12 Months | 1,828 | 579
Fair Value of Investments with Unrealized Losses, 12 Months or Greater | 2,345 | 10,610
Gross Unrealized Losses, 12 Months or Greater | 181 | 1,231
Fair Value of Investments with Unrealized Losses, Total | 52,906 | 53,821
Gross Unrealized Losses, Total | 2,009 | 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 | 22,764 | 25,899
Held-to-Maturity, Gross Unrealized Losses, Less Than 12 Months | 118 | 148
Held-to-Maturity, Fair Value of Investments with Unrealized Losses 12 Months or Greater | 2,345 | 10,610
Held-to-Maturity, Gross Unrealized Losses, 12 Months or Greater | 181 | 1,231
Held-to-Maturity, Fair Value of Investments with Unrealized Losses, Total | 25,109 | 36,509
Held-to-Maturity, Gross Unrealized Losses, Total | 299 | 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 | 10,734 | 23,063
Held-to-Maturity, Gross Unrealized Losses, Less Than 12 Months | 12 | 130
Held-to-Maturity, Fair Value of Investments with Unrealized Losses, Total | 10,734 | 23,063
Held-to-Maturity, Gross Unrealized Losses, Total | 12 | 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 | 11,913 | 2,291
Held-to-Maturity, Gross Unrealized Losses, Less Than 12 Months | 106 | 3
Held-to-Maturity, Fair Value of Investments with Unrealized Losses 12 Months or Greater |  | 5,718
Held-to-Maturity, Gross Unrealized Losses, 12 Months or Greater |  | 357
Held-to-Maturity, Fair Value of Investments with Unrealized Losses, Total | 11,913 | 8,009
Held-to-Maturity, Gross Unrealized Losses, Total | 106 | 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, Less Than 12 Months | 117 |
Held-to-Maturity, Fair Value of Investments with Unrealized Losses 12 Months or Greater | 68 | 1,012
Held-to-Maturity, Gross Unrealized Losses, 12 Months or Greater | 5 | 44
Held-to-Maturity, Fair Value of Investments with Unrealized Losses, Total | 185 | 1,012
Held-to-Maturity, Gross Unrealized Losses, Total | 5 | 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 | 2,277 | 3,880
Held-to-Maturity, Gross Unrealized Losses, 12 Months or Greater | 176 | 830
Held-to-Maturity, Fair Value of Investments with Unrealized Losses, Total | 2,277 | 4,425
Held-to-Maturity, Gross Unrealized Losses, Total | 176 | 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 | 27,797 | 17,312
Available-for Sale, Gross Unrealized Losses, Less Than 12 Months | 1,710 | 431
Available-for Sale, Fair Value of Investments with Unrealized Losses, Total | 27,797 | 17,312
Available-for Sale, Gross Unrealized Losses, Total | 1,710 | 431
Fair Value of Investments 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 | 6,411 | 14,301
Available-for Sale, Gross Unrealized Losses, Less Than 12 Months | 24 | 233
Available-for Sale, Fair Value of Investments with Unrealized Losses, Total | 6,411 | 14,301
Available-for Sale, Gross Unrealized Losses, Total | 24 | 233
Fair Value of Investments 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 | 6,281 | 222
Available-for Sale, Gross Unrealized Losses, Less Than 12 Months | 142 | 1
Available-for Sale, Fair Value of Investments with Unrealized Losses, Total | 6,281 | 222
Available-for Sale, Gross Unrealized Losses, Total | 142 | 1
Fair Value of Investments 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 | 10,919 |
Available-for Sale, Gross Unrealized Losses, Less Than 12 Months | 859 |
Available-for Sale, Fair Value of Investments with Unrealized Losses, Total | 10,919 |
Available-for Sale, Gross Unrealized Losses, Total | 859 |
Fair Value of Investments 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 | 4,186 | 2,789
Available-for Sale, Gross Unrealized Losses, Less Than 12 Months | 685 | 197
Available-for Sale, Fair Value of Investments with Unrealized Losses, Total | 4,186 | 2,789
Available-for Sale, Gross Unrealized Losses, Total | 685 | 197
Fair Value of Investments with Unrealized Losses, 12 Months or Greater |  |
Gross Unrealized Losses, 12 Months or Greater |  |

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