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Fair Value of Financial Instruments (Assets Measured at Fair Value Recurring) (Details) (USD $)
In Thousands, unless otherwise specified
Sep. 30, 2014
Dec. 31, 2013
Recurring Basis    
Available-for-sale securities $ 631,827 $ 606,108
Held-to-maturity securities 48,234 46,094
U.S. Treasury and government agencies
    
Recurring Basis    
Available-for-sale securities 7 20
U.S. government sponsored agencies
    
Recurring Basis    
Available-for-sale securities 8,689 319
States and political subdivisions
    
Recurring Basis    
Available-for-sale securities 64,048 50,962
Residential mortgage-backed securities
    
Recurring Basis    
Available-for-sale securities 518,159 510,097
Commercial mortgage-backed securities
    
Recurring Basis    
Available-for-sale securities 27,542 32,304
Bank-issued trust preferred securities
    
Recurring Basis    
Available-for-sale securities 8,194 7,829
Equity securities
    
Recurring Basis    
Available-for-sale securities 5,188 4,577
Fair Value of Securities | Fair Value
    
Recurring Basis    
Held-to-maturity securities 48,234 46,094
Fair Value of Securities | Quoted Prices in Active Markets for Identical Assets (Level 1)
    
Recurring Basis    
Held-to-maturity securities 0 0
Fair Value of Securities | Significant Other Observable Inputs (Level 2)
    
Recurring Basis    
Held-to-maturity securities 48,234 46,094
Fair Value of Securities | Significant Unobservable Inputs (Level 3)
    
Recurring Basis    
Held-to-maturity securities 0 0
Fair Value of Securities | States and political subdivisions | Fair Value
    
Recurring Basis    
Held-to-maturity securities 4,251 3,929
Fair Value of Securities | States and political subdivisions | Quoted Prices in Active Markets for Identical Assets (Level 1)
    
Recurring Basis    
Held-to-maturity securities 0 0
Fair Value of Securities | States and political subdivisions | Significant Other Observable Inputs (Level 2)
    
Recurring Basis    
Held-to-maturity securities 4,251 3,929
Fair Value of Securities | States and political subdivisions | Significant Unobservable Inputs (Level 3)
    
Recurring Basis    
Held-to-maturity securities 0 0
Fair Value of Securities | Residential mortgage-backed securities | Fair Value
    
Recurring Basis    
Held-to-maturity securities 36,582 34,530
Fair Value of Securities | Residential mortgage-backed securities | Quoted Prices in Active Markets for Identical Assets (Level 1)
    
Recurring Basis    
Held-to-maturity securities 0 0
Fair Value of Securities | Residential mortgage-backed securities | Significant Other Observable Inputs (Level 2)
    
Recurring Basis    
Held-to-maturity securities 36,582 34,530
Fair Value of Securities | Residential mortgage-backed securities | Significant Unobservable Inputs (Level 3)
    
Recurring Basis    
Held-to-maturity securities 0 0
Fair Value of Securities | Commercial mortgage-backed securities | Fair Value
    
Recurring Basis    
Held-to-maturity securities 7,401 7,635
Fair Value of Securities | Commercial mortgage-backed securities | Quoted Prices in Active Markets for Identical Assets (Level 1)
    
Recurring Basis    
Held-to-maturity securities 0 0
Fair Value of Securities | Commercial mortgage-backed securities | Significant Other Observable Inputs (Level 2)
    
Recurring Basis    
Held-to-maturity securities 7,401 7,635
Fair Value of Securities | Commercial mortgage-backed securities | Significant Unobservable Inputs (Level 3)
    
Recurring Basis    
Held-to-maturity securities 0 0
Recurring Basis [Member] | Fair Value
    
Recurring Basis    
Available-for-sale securities 631,827 606,108
Recurring Basis [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1)
    
Recurring Basis    
Available-for-sale securities 4,984 4,443
Recurring Basis [Member] | Significant Other Observable Inputs (Level 2)
    
Recurring Basis    
Available-for-sale securities 626,843 601,665
Recurring Basis [Member] | Significant Unobservable Inputs (Level 3)
    
Recurring Basis    
Available-for-sale securities 0 0
Recurring Basis [Member] | U.S. Treasury and government agencies | Fair Value
    
Recurring Basis    
Available-for-sale securities 7 20
Recurring Basis [Member] | U.S. Treasury and government agencies | Quoted Prices in Active Markets for Identical Assets (Level 1)
    
Recurring Basis    
Available-for-sale securities 0 0
Recurring Basis [Member] | U.S. Treasury and government agencies | Significant Other Observable Inputs (Level 2)
    
Recurring Basis    
Available-for-sale securities 7 20
Recurring Basis [Member] | U.S. Treasury and government agencies | Significant Unobservable Inputs (Level 3)
    
Recurring Basis    
Available-for-sale securities 0 0
Recurring Basis [Member] | U.S. government sponsored agencies | Fair Value
    
Recurring Basis    
Available-for-sale securities 8,689 319
Recurring Basis [Member] | U.S. government sponsored agencies | Quoted Prices in Active Markets for Identical Assets (Level 1)
    
Recurring Basis    
Available-for-sale securities 0 0
Recurring Basis [Member] | U.S. government sponsored agencies | Significant Other Observable Inputs (Level 2)
    
Recurring Basis    
Available-for-sale securities 8,689 319
Recurring Basis [Member] | U.S. government sponsored agencies | Significant Unobservable Inputs (Level 3)
    
Recurring Basis    
Available-for-sale securities 0 0
Recurring Basis [Member] | States and political subdivisions | Fair Value
    
Recurring Basis    
Available-for-sale securities 64,048 50,962
Recurring Basis [Member] | States and political subdivisions | Quoted Prices in Active Markets for Identical Assets (Level 1)
    
Recurring Basis    
Available-for-sale securities 0 0
Recurring Basis [Member] | States and political subdivisions | Significant Other Observable Inputs (Level 2)
    
Recurring Basis    
Available-for-sale securities 64,048 50,962
Recurring Basis [Member] | States and political subdivisions | Significant Unobservable Inputs (Level 3)
    
Recurring Basis    
Available-for-sale securities 0 0
Recurring Basis [Member] | Residential mortgage-backed securities | Fair Value
    
Recurring Basis    
Available-for-sale securities 518,159 510,097
Recurring Basis [Member] | Residential mortgage-backed securities | Quoted Prices in Active Markets for Identical Assets (Level 1)
    
Recurring Basis    
Available-for-sale securities 0 0
Recurring Basis [Member] | Residential mortgage-backed securities | Significant Other Observable Inputs (Level 2)
    
Recurring Basis    
Available-for-sale securities 518,159 510,097
Recurring Basis [Member] | Residential mortgage-backed securities | Significant Unobservable Inputs (Level 3)
    
Recurring Basis    
Available-for-sale securities 0 0
Recurring Basis [Member] | Commercial mortgage-backed securities | Fair Value
    
Recurring Basis    
Available-for-sale securities 27,542 32,304
Recurring Basis [Member] | Commercial mortgage-backed securities | Quoted Prices in Active Markets for Identical Assets (Level 1)
    
Recurring Basis    
Available-for-sale securities 0 0
Recurring Basis [Member] | Commercial mortgage-backed securities | Significant Other Observable Inputs (Level 2)
    
Recurring Basis    
Available-for-sale securities 27,542 32,304
Recurring Basis [Member] | Commercial mortgage-backed securities | Significant Unobservable Inputs (Level 3)
    
Recurring Basis    
Available-for-sale securities 0 0
Recurring Basis [Member] | Bank-issued trust preferred securities | Fair Value
    
Recurring Basis    
Available-for-sale securities 8,194 7,829
Recurring Basis [Member] | Bank-issued trust preferred securities | Quoted Prices in Active Markets for Identical Assets (Level 1)
    
Recurring Basis    
Available-for-sale securities 0 0
Recurring Basis [Member] | Bank-issued trust preferred securities | Significant Other Observable Inputs (Level 2)
    
Recurring Basis    
Available-for-sale securities 8,194 7,829
Recurring Basis [Member] | Bank-issued trust preferred securities | Significant Unobservable Inputs (Level 3)
    
Recurring Basis    
Available-for-sale securities 0 0
Recurring Basis [Member] | Equity securities | Fair Value
    
Recurring Basis    
Available-for-sale securities 5,188 4,577
Recurring Basis [Member] | Equity securities | Quoted Prices in Active Markets for Identical Assets (Level 1)
    
Recurring Basis    
Available-for-sale securities 4,984 4,443
Recurring Basis [Member] | Equity securities | Significant Other Observable Inputs (Level 2)
    
Recurring Basis    
Available-for-sale securities 204 134
Recurring Basis [Member] | Equity securities | Significant Unobservable Inputs (Level 3)
    
Recurring Basis    
Available-for-sale securities $ 0 $ 0