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Fair Value of Financial Instruments Fair Value - Recurring and Nonrecurring (Details) (USD $)
In Thousands, unless otherwise specified
Sep. 30, 2013
Dec. 31, 2012
Sep. 30, 2012
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Available-for-Sale $ 486,888 $ 478,698 $ 425,416
Other Real Estate and Repossessed Assets, Net 499 1,034 834
Fair Value of Assets and Liabilities Measured on a Recurring Basis [Member]
      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Available-for-Sale 486,888 478,698 425,416
Fair Value of Assets and Liabilities Measured on a Recurring Basis [Member] | Quoted Prices In Active Markets for Indentical Assets (Level 1) [Member]
      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Available-for-Sale 0 0 0
Fair Value of Assets and Liabilities Measured on a Recurring Basis [Member] | Significant Other Observable Inputs (Level 2) [Member]
      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Available-for-Sale 486,888 478,698 425,416
Fair Value of Assets and Liabilities Measured on a Recurring Basis [Member] | Significant Unobservable Inputs (Level 3) [Member]
      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Available-for-Sale 0 0 0
Fair Value of Assets and Liabilities Measured on a Nonrecurring Basis [Member]
      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Collateral Dependent Impaired Loans 0 1,020 486
Other Real Estate and Repossessed Assets, Net 499 1,034 834
Fair Value of Assets and Liabilities Measured on a Nonrecurring Basis [Member] | Quoted Prices In Active Markets for Indentical Assets (Level 1) [Member]
      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Collateral Dependent Impaired Loans 0 0 0
Other Real Estate and Repossessed Assets, Net 0 0 0
Fair Value of Assets and Liabilities Measured on a Nonrecurring Basis [Member] | Significant Other Observable Inputs (Level 2) [Member]
      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Collateral Dependent Impaired Loans 0 0 0
Other Real Estate and Repossessed Assets, Net 0 0 0
Fair Value of Assets and Liabilities Measured on a Nonrecurring Basis [Member] | Significant Unobservable Inputs (Level 3) [Member]
      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Collateral Dependent Impaired Loans 0 1,020 486
Other Real Estate and Repossessed Assets, Net 499 1,034 834
U.S. Agency Obligations [Member]
      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Available-for-Sale 149,774 122,457 56,391
U.S. Agency Obligations [Member] | Fair Value of Assets and Liabilities Measured on a Recurring Basis [Member]
      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Available-for-Sale 149,774 122,457 56,391
U.S. Agency Obligations [Member] | Fair Value of Assets and Liabilities Measured on a Recurring Basis [Member] | Quoted Prices In Active Markets for Indentical Assets (Level 1) [Member]
      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Available-for-Sale 0 0 0
U.S. Agency Obligations [Member] | Fair Value of Assets and Liabilities Measured on a Recurring Basis [Member] | Significant Other Observable Inputs (Level 2) [Member]
      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Available-for-Sale 149,774 122,457 56,391
U.S. Agency Obligations [Member] | Fair Value of Assets and Liabilities Measured on a Recurring Basis [Member] | Significant Unobservable Inputs (Level 3) [Member]
      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Available-for-Sale 0 0 0
State and Municipal Obligations [Member]
      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Available-for-Sale 133,919 84,838 62,965
State and Municipal Obligations [Member] | Fair Value of Assets and Liabilities Measured on a Recurring Basis [Member]
      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Available-for-Sale 133,919 84,838 62,965
State and Municipal Obligations [Member] | Fair Value of Assets and Liabilities Measured on a Recurring Basis [Member] | Quoted Prices In Active Markets for Indentical Assets (Level 1) [Member]
      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Available-for-Sale 0 0 0
State and Municipal Obligations [Member] | Fair Value of Assets and Liabilities Measured on a Recurring Basis [Member] | Significant Other Observable Inputs (Level 2) [Member]
      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Available-for-Sale 133,919 84,838 62,965
State and Municipal Obligations [Member] | Fair Value of Assets and Liabilities Measured on a Recurring Basis [Member] | Significant Unobservable Inputs (Level 3) [Member]
      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Available-for-Sale 0 0 0
Mortgage-Backed Securities - Residential [Member] | Fair Value of Assets and Liabilities Measured on a Recurring Basis [Member]
      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Available-for-Sale 185,215 261,804 304,085
Mortgage-Backed Securities - Residential [Member] | Fair Value of Assets and Liabilities Measured on a Recurring Basis [Member] | Quoted Prices In Active Markets for Indentical Assets (Level 1) [Member]
      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Available-for-Sale 0 0 0
Mortgage-Backed Securities - Residential [Member] | Fair Value of Assets and Liabilities Measured on a Recurring Basis [Member] | Significant Other Observable Inputs (Level 2) [Member]
      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Available-for-Sale 185,215 261,804 304,085
Mortgage-Backed Securities - Residential [Member] | Fair Value of Assets and Liabilities Measured on a Recurring Basis [Member] | Significant Unobservable Inputs (Level 3) [Member]
      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Available-for-Sale 0 0 0
Corporate and Other Debt Securities [Member]
      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Available-for-Sale 16,798 8,451 800
Corporate and Other Debt Securities [Member] | Fair Value of Assets and Liabilities Measured on a Recurring Basis [Member]
      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Available-for-Sale 16,798 8,451 800
Corporate and Other Debt Securities [Member] | Fair Value of Assets and Liabilities Measured on a Recurring Basis [Member] | Quoted Prices In Active Markets for Indentical Assets (Level 1) [Member]
      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Available-for-Sale 0 0 0
Corporate and Other Debt Securities [Member] | Fair Value of Assets and Liabilities Measured on a Recurring Basis [Member] | Significant Other Observable Inputs (Level 2) [Member]
      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Available-for-Sale 16,798 8,451 800
Corporate and Other Debt Securities [Member] | Fair Value of Assets and Liabilities Measured on a Recurring Basis [Member] | Significant Unobservable Inputs (Level 3) [Member]
      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Available-for-Sale 0 0 0
Mutual Funds and Equity Securities [Member]
      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Available-for-Sale 1,182 1,148 1,175
Mutual Funds and Equity Securities [Member] | Fair Value of Assets and Liabilities Measured on a Recurring Basis [Member]
      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Available-for-Sale 1,182 1,148 1,175
Mutual Funds and Equity Securities [Member] | Fair Value of Assets and Liabilities Measured on a Recurring Basis [Member] | Quoted Prices In Active Markets for Indentical Assets (Level 1) [Member]
      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Available-for-Sale 0 0 0
Mutual Funds and Equity Securities [Member] | Fair Value of Assets and Liabilities Measured on a Recurring Basis [Member] | Significant Other Observable Inputs (Level 2) [Member]
      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Available-for-Sale 1,182 1,148 1,175
Mutual Funds and Equity Securities [Member] | Fair Value of Assets and Liabilities Measured on a Recurring Basis [Member] | Significant Unobservable Inputs (Level 3) [Member]
      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Available-for-Sale $ 0 $ 0 $ 0