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Fair Value of Financial Instruments (Assets Measured at Fair Value on a Recurring Basis) (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2012
Dec. 31, 2011
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Available-for-sale securities, fair value $ 639,185 $ 628,571
U.S. Treasury and government agencies
    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Available-for-sale securities, fair value 26 32
U.S. government sponsored agencies
    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Available-for-sale securities, fair value 516 13,037
States and political subdivisions
    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Available-for-sale securities, fair value 45,668 35,745
Residential mortgage-backed securities
    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Available-for-sale securities, fair value 514,096 527,003
Commercial mortgage-backed securities
    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Available-for-sale securities, fair value 64,416 37,289
Bank-issued trust preferred securities
    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Available-for-sale securities, fair value 10,357 12,211
Equity Securities
    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Available-for-sale securities, fair value 4,106 3,254
Recurring Basis | Fair Value
    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Available-for-sale securities, fair value 639,185 628,571
Recurring Basis | Quoted Prices in Active Markets for Identical Assets (Level 1)
    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Available-for-sale securities, fair value 4,652 3,126
Recurring Basis | Significant Other Observable Inputs (Level 2)
    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Available-for-sale securities, fair value 634,533 625,445
Recurring Basis | Significant Unobservable Inputs (Level 3)
    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Available-for-sale securities, fair value 0 0
Recurring Basis | U.S. Treasury and government agencies | Fair Value
    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Available-for-sale securities, fair value 26 32
Recurring Basis | U.S. Treasury and government agencies | Quoted Prices in Active Markets for Identical Assets (Level 1)
    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Available-for-sale securities, fair value 0 0
Recurring Basis | U.S. Treasury and government agencies | Significant Other Observable Inputs (Level 2)
    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Available-for-sale securities, fair value 26 32
Recurring Basis | U.S. Treasury and government agencies | Significant Unobservable Inputs (Level 3)
    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Available-for-sale securities, fair value 0 0
Recurring Basis | U.S. government sponsored agencies | Fair Value
    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Available-for-sale securities, fair value 516 13,037
Recurring Basis | U.S. government sponsored agencies | Quoted Prices in Active Markets for Identical Assets (Level 1)
    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Available-for-sale securities, fair value 0 0
Recurring Basis | U.S. government sponsored agencies | Significant Other Observable Inputs (Level 2)
    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Available-for-sale securities, fair value 516 13,037
Recurring Basis | U.S. government sponsored agencies | Significant Unobservable Inputs (Level 3)
    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Available-for-sale securities, fair value 0 0
Recurring Basis | States and political subdivisions | Fair Value
    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Available-for-sale securities, fair value 45,668 35,745
Recurring Basis | States and political subdivisions | Quoted Prices in Active Markets for Identical Assets (Level 1)
    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Available-for-sale securities, fair value 681 0
Recurring Basis | States and political subdivisions | Significant Other Observable Inputs (Level 2)
    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Available-for-sale securities, fair value 44,987 35,745
Recurring Basis | States and political subdivisions | Significant Unobservable Inputs (Level 3)
    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Available-for-sale securities, fair value 0 0
Recurring Basis | Residential mortgage-backed securities | Fair Value
    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Available-for-sale securities, fair value 514,096 527,003
Recurring Basis | Residential mortgage-backed securities | Quoted Prices in Active Markets for Identical Assets (Level 1)
    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Available-for-sale securities, fair value 0 0
Recurring Basis | Residential mortgage-backed securities | Significant Other Observable Inputs (Level 2)
    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Available-for-sale securities, fair value 514,096 527,003
Recurring Basis | Residential mortgage-backed securities | Significant Unobservable Inputs (Level 3)
    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Available-for-sale securities, fair value 0 0
Recurring Basis | Commercial mortgage-backed securities | Fair Value
    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Available-for-sale securities, fair value 64,416 37,289
Recurring Basis | Commercial mortgage-backed securities | Quoted Prices in Active Markets for Identical Assets (Level 1)
    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Available-for-sale securities, fair value 0 0
Recurring Basis | Commercial mortgage-backed securities | Significant Other Observable Inputs (Level 2)
    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Available-for-sale securities, fair value 64,416 37,289
Recurring Basis | Commercial mortgage-backed securities | Significant Unobservable Inputs (Level 3)
    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Available-for-sale securities, fair value 0 0
Recurring Basis | Bank-issued trust preferred securities | Fair Value
    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Available-for-sale securities, fair value 10,357 12,211
Recurring Basis | Bank-issued trust preferred securities | Quoted Prices in Active Markets for Identical Assets (Level 1)
    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Available-for-sale securities, fair value 0 0
Recurring Basis | Bank-issued trust preferred securities | Significant Other Observable Inputs (Level 2)
    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Available-for-sale securities, fair value 10,357 12,211
Recurring Basis | Bank-issued trust preferred securities | Significant Unobservable Inputs (Level 3)
    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Available-for-sale securities, fair value 0 0
Recurring Basis | Equity Securities | Fair Value
    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Available-for-sale securities, fair value 4,106 3,254
Recurring Basis | Equity Securities | Quoted Prices in Active Markets for Identical Assets (Level 1)
    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Available-for-sale securities, fair value 3,971 3,126
Recurring Basis | Equity Securities | Significant Other Observable Inputs (Level 2)
    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Available-for-sale securities, fair value 135 128
Recurring Basis | Equity Securities | Significant Unobservable Inputs (Level 3)
    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Available-for-sale securities, fair value $ 0 $ 0