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Fair Value Measurements and Fair Value of Financial Instruments (Assets and Liabilities Measured at Fair Value on a Recurring Basis) (Details) (USD $) In Thousands, unless otherwise specified | Jun. 30, 2012 | Dec. 31, 2011
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Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Available-for-sale Securities | $ 467,190 | $ 414,507
Estimate of Fair Value, Fair Value Disclosure [Member] | Assets Measured at Fair Value on a Recurring Basis [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Available-for-sale Securities | 467,190 | 414,507
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Assets Measured at Fair Value on a Recurring Basis [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Available-for-sale Securities | 12,112 | 10,546
Significant Other Observable Inputs (Level 2) [Member] | Assets Measured at Fair Value on a Recurring Basis [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Available-for-sale Securities | 453,222 | 401,846
Significant Unobservable Inputs (Level 3) [Member] | Assets Measured at Fair Value on a Recurring Basis [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Available-for-sale Securities | 1,856 | 2,115
Federal agency obligations [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Available-for-sale Securities | 18,683 | 24,969
Federal agency obligations [Member] | Estimate of Fair Value, Fair Value Disclosure [Member] | Assets Measured at Fair Value on a Recurring Basis [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Available-for-sale Securities | 18,683 |
Assets, Fair Value Disclosure, Recurring |  | 24,969
Federal agency obligations [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Assets Measured at Fair Value on a Recurring Basis [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Assets, Fair Value Disclosure, Recurring |  | 2,004
Federal agency obligations [Member] | Significant Other Observable Inputs (Level 2) [Member] | Assets Measured at Fair Value on a Recurring Basis [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Available-for-sale Securities | 18,683 |
Assets, Fair Value Disclosure, Recurring |  | 22,965
Residential mortgage-backed securities [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Available-for-sale Securities | 88,794 | 115,364
Residential mortgage-backed securities [Member] | Estimate of Fair Value, Fair Value Disclosure [Member] | Assets Measured at Fair Value on a Recurring Basis [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Available-for-sale Securities | 88,794 |
Assets, Fair Value Disclosure, Recurring |  | 115,364
Residential mortgage-backed securities [Member] | Significant Other Observable Inputs (Level 2) [Member] | Assets Measured at Fair Value on a Recurring Basis [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Available-for-sale Securities | 88,794 |
Assets, Fair Value Disclosure, Recurring |  | 115,364
Commercial mortgage-backed securities [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Available-for-sale Securities | 9,799 |
Commercial mortgage-backed securities [Member] | Estimate of Fair Value, Fair Value Disclosure [Member] | Assets Measured at Fair Value on a Recurring Basis [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Available-for-sale Securities | 9,799 |
Assets, Fair Value Disclosure, Recurring |  | 1,899
Commercial mortgage-backed securities [Member] | Significant Other Observable Inputs (Level 2) [Member] | Assets Measured at Fair Value on a Recurring Basis [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Available-for-sale Securities | 9,799 |
Commercial mortgage-backed securities [Member] | Significant Unobservable Inputs (Level 3) [Member] | Assets Measured at Fair Value on a Recurring Basis [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Assets, Fair Value Disclosure, Recurring |  | 1,899
Obligations of U.S. states and political subdivisions [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Available-for-sale Securities | 85,144 | 69,173
Obligations of U.S. states and political subdivisions [Member] | Estimate of Fair Value, Fair Value Disclosure [Member] | Assets Measured at Fair Value on a Recurring Basis [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Available-for-sale Securities | 85,144 |
Assets, Fair Value Disclosure, Recurring |  | 69,173
Obligations of U.S. states and political subdivisions [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Assets Measured at Fair Value on a Recurring Basis [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Available-for-sale Securities | 256 |
Assets, Fair Value Disclosure, Recurring |  | 397
Obligations of U.S. states and political subdivisions [Member] | Significant Other Observable Inputs (Level 2) [Member] | Assets Measured at Fair Value on a Recurring Basis [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Available-for-sale Securities | 84,888 |
Assets, Fair Value Disclosure, Recurring |  | 68,776
Trust preferred securities [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Available-for-sale Securities | 18,825 | 16,187
Trust preferred securities [Member] | Estimate of Fair Value, Fair Value Disclosure [Member] | Assets Measured at Fair Value on a Recurring Basis [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Available-for-sale Securities | 18,825 |
Assets, Fair Value Disclosure, Recurring |  | 16,187
Trust preferred securities [Member] | Significant Other Observable Inputs (Level 2) [Member] | Assets Measured at Fair Value on a Recurring Basis [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Available-for-sale Securities | 18,721 |
Assets, Fair Value Disclosure, Recurring |  | 15,971
Trust preferred securities [Member] | Significant Unobservable Inputs (Level 3) [Member] | Assets Measured at Fair Value on a Recurring Basis [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Available-for-sale Securities | 104 |
Assets, Fair Value Disclosure, Recurring |  | 216
Corporate bonds and notes [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Available-for-sale Securities | 212,704 | 173,117
Corporate bonds and notes [Member] | Estimate of Fair Value, Fair Value Disclosure [Member] | Assets Measured at Fair Value on a Recurring Basis [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Available-for-sale Securities | 212,704 |
Assets, Fair Value Disclosure, Recurring |  | 173,117
Corporate bonds and notes [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Assets Measured at Fair Value on a Recurring Basis [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Assets, Fair Value Disclosure, Recurring |  | 2,000
Corporate bonds and notes [Member] | Significant Other Observable Inputs (Level 2) [Member] | Assets Measured at Fair Value on a Recurring Basis [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Available-for-sale Securities | 212,704 |
Assets, Fair Value Disclosure, Recurring |  | 171,117
Collateralized mortgage obligations [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Available-for-sale Securities | 1,752 | 1,899
Collateralized mortgage obligations [Member] | Estimate of Fair Value, Fair Value Disclosure [Member] | Assets Measured at Fair Value on a Recurring Basis [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Available-for-sale Securities | 1,752 |
Collateralized mortgage obligations [Member] | Significant Unobservable Inputs (Level 3) [Member] | Assets Measured at Fair Value on a Recurring Basis [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Available-for-sale Securities | 1,752 |
Asset-backed securities [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Available-for-sale Securities | 19,633 | 7,653
Asset-backed securities [Member] | Estimate of Fair Value, Fair Value Disclosure [Member] | Assets Measured at Fair Value on a Recurring Basis [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Available-for-sale Securities | 19,633 |
Assets, Fair Value Disclosure, Recurring |  | 7,653
Asset-backed securities [Member] | Significant Other Observable Inputs (Level 2) [Member] | Assets Measured at Fair Value on a Recurring Basis [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Available-for-sale Securities | 19,633 |
Assets, Fair Value Disclosure, Recurring |  | 7,653
Equity securities [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Available-for-sale Securities | 601 | 262
Equity securities [Member] | Estimate of Fair Value, Fair Value Disclosure [Member] | Assets Measured at Fair Value on a Recurring Basis [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Available-for-sale Securities | 601 |
Assets, Fair Value Disclosure, Recurring |  | 262
Equity securities [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Assets Measured at Fair Value on a Recurring Basis [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Available-for-sale Securities | 601 |
Assets, Fair Value Disclosure, Recurring |  | 262
Other securities [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Available-for-sale Securities | 11,255 | 5,883
Other securities [Member] | Estimate of Fair Value, Fair Value Disclosure [Member] | Assets Measured at Fair Value on a Recurring Basis [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Available-for-sale Securities | 11,255 |
Other securities [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Assets Measured at Fair Value on a Recurring Basis [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Available-for-sale Securities | $ 11,255 |

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- Definition This element represents the aggregate of the assets reported on the balance sheet at period end measured at fair value on a recurring basis by the entity. This element is intended to be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. + References No definition available. + Details
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