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Fair Value of Financial Instruments Recurring basis (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2013
Dec. 31, 2012
Investments    
Total held-to-maturity securities $ 46,094 $ 47,124
Total available-for-sale securities 606,108 639,185
U.S. Treasury and government agencies
    
Investments    
Total available-for-sale securities 20 26
U.S. government sponsored agencies
    
Investments    
Total available-for-sale securities 319 516
States and political subdivisions
    
Investments    
Total available-for-sale securities 50,962 45,668
Residential mortgage-backed securities
    
Investments    
Total available-for-sale securities 510,097 514,096
Commercial mortgage-backed securities
    
Investments    
Total available-for-sale securities 32,304 64,416
Bank-issued trust preferred securities
    
Investments    
Total available-for-sale securities 7,829 10,357
Equity securities
    
Investments    
Total available-for-sale securities 4,577 4,106
Fair Value | Fair Value
    
Investments    
Total held-to-maturity securities 46,094 47,124
Fair Value | Recurring Basis
    
Investments    
Total available-for-sale securities 606,108 639,185
Fair Value | U.S. Treasury and government agencies | Recurring Basis
    
Investments    
Total available-for-sale securities 20 26
Fair Value | U.S. government sponsored agencies | Recurring Basis
    
Investments    
Total available-for-sale securities 319 516
Fair Value | States and political subdivisions | Fair Value
    
Investments    
Total held-to-maturity securities 3,929 4,250
Fair Value | States and political subdivisions | Recurring Basis
    
Investments    
Total available-for-sale securities 50,962 45,668
Fair Value | Residential mortgage-backed securities | Fair Value
    
Investments    
Total held-to-maturity securities 34,530 34,560
Fair Value | Residential mortgage-backed securities | Recurring Basis
    
Investments    
Total available-for-sale securities 510,097 514,096
Fair Value | Commercial mortgage-backed securities | Fair Value
    
Investments    
Total held-to-maturity securities 7,635 8,314
Fair Value | Commercial mortgage-backed securities | Recurring Basis
    
Investments    
Total available-for-sale securities 32,304 64,416
Fair Value | Bank-issued trust preferred securities | Recurring Basis
    
Investments    
Total available-for-sale securities 7,829 10,357
Fair Value | Equity securities | Recurring Basis
    
Investments    
Total available-for-sale securities 4,577 4,106
Quoted Prices in Active Markets for Identical Assets (Level 1) | Fair Value
    
Investments    
Total held-to-maturity securities 0 0
Quoted Prices in Active Markets for Identical Assets (Level 1) | Recurring Basis
    
Investments    
Total available-for-sale securities 4,443 4,652
Quoted Prices in Active Markets for Identical Assets (Level 1) | U.S. Treasury and government agencies | Recurring Basis
    
Investments    
Total available-for-sale securities 0 0
Quoted Prices in Active Markets for Identical Assets (Level 1) | U.S. government sponsored agencies | Recurring Basis
    
Investments    
Total available-for-sale securities 0 0
Quoted Prices in Active Markets for Identical Assets (Level 1) | States and political subdivisions | Fair Value
    
Investments    
Total held-to-maturity securities 0 0
Quoted Prices in Active Markets for Identical Assets (Level 1) | States and political subdivisions | Recurring Basis
    
Investments    
Total available-for-sale securities 0 681
Quoted Prices in Active Markets for Identical Assets (Level 1) | Residential mortgage-backed securities | Fair Value
    
Investments    
Total held-to-maturity securities 0 0
Quoted Prices in Active Markets for Identical Assets (Level 1) | Residential mortgage-backed securities | Recurring Basis
    
Investments    
Total available-for-sale securities 0 0
Quoted Prices in Active Markets for Identical Assets (Level 1) | Commercial mortgage-backed securities | Fair Value
    
Investments    
Total held-to-maturity securities 0 0
Quoted Prices in Active Markets for Identical Assets (Level 1) | Commercial mortgage-backed securities | Recurring Basis
    
Investments    
Total available-for-sale securities 0 0
Quoted Prices in Active Markets for Identical Assets (Level 1) | Bank-issued trust preferred securities | Recurring Basis
    
Investments    
Total available-for-sale securities 0 0
Quoted Prices in Active Markets for Identical Assets (Level 1) | Equity securities | Recurring Basis
    
Investments    
Total available-for-sale securities 4,443 3,971
Significant Other Observable Inputs (Level 2) | Fair Value
    
Investments    
Total held-to-maturity securities 46,094 47,124
Significant Other Observable Inputs (Level 2) | Recurring Basis
    
Investments    
Total available-for-sale securities 601,665 634,533
Significant Other Observable Inputs (Level 2) | U.S. Treasury and government agencies | Recurring Basis
    
Investments    
Total available-for-sale securities 20 26
Significant Other Observable Inputs (Level 2) | U.S. government sponsored agencies | Recurring Basis
    
Investments    
Total available-for-sale securities 319 516
Significant Other Observable Inputs (Level 2) | States and political subdivisions | Fair Value
    
Investments    
Total held-to-maturity securities 3,929 4,250
Significant Other Observable Inputs (Level 2) | States and political subdivisions | Recurring Basis
    
Investments    
Total available-for-sale securities 50,962 44,987
Significant Other Observable Inputs (Level 2) | Residential mortgage-backed securities | Fair Value
    
Investments    
Total held-to-maturity securities 34,530 34,560
Significant Other Observable Inputs (Level 2) | Residential mortgage-backed securities | Recurring Basis
    
Investments    
Total available-for-sale securities 510,097 514,096
Significant Other Observable Inputs (Level 2) | Commercial mortgage-backed securities | Fair Value
    
Investments    
Total held-to-maturity securities 7,635 8,314
Significant Other Observable Inputs (Level 2) | Commercial mortgage-backed securities | Recurring Basis
    
Investments    
Total available-for-sale securities 32,304 64,416
Significant Other Observable Inputs (Level 2) | Bank-issued trust preferred securities | Recurring Basis
    
Investments    
Total available-for-sale securities 7,829 10,357
Significant Other Observable Inputs (Level 2) | Equity securities | Recurring Basis
    
Investments    
Total available-for-sale securities 134 135
Significant Unobservable Inputs (Level 3) | Fair Value
    
Investments    
Total held-to-maturity securities 0 0
Significant Unobservable Inputs (Level 3) | Recurring Basis
    
Investments    
Total available-for-sale securities 0 0
Significant Unobservable Inputs (Level 3) | U.S. Treasury and government agencies | Recurring Basis
    
Investments    
Total available-for-sale securities 0 0
Significant Unobservable Inputs (Level 3) | U.S. government sponsored agencies | Recurring Basis
    
Investments    
Total available-for-sale securities 0 0
Significant Unobservable Inputs (Level 3) | States and political subdivisions | Fair Value
    
Investments    
Total held-to-maturity securities 0 0
Significant Unobservable Inputs (Level 3) | States and political subdivisions | Recurring Basis
    
Investments    
Total available-for-sale securities 0 0
Significant Unobservable Inputs (Level 3) | Residential mortgage-backed securities | Fair Value
    
Investments    
Total held-to-maturity securities 0 0
Significant Unobservable Inputs (Level 3) | Residential mortgage-backed securities | Recurring Basis
    
Investments    
Total available-for-sale securities 0 0
Significant Unobservable Inputs (Level 3) | Commercial mortgage-backed securities | Fair Value
    
Investments    
Total held-to-maturity securities 0 0
Significant Unobservable Inputs (Level 3) | Commercial mortgage-backed securities | Recurring Basis
    
Investments    
Total available-for-sale securities 0 0
Significant Unobservable Inputs (Level 3) | Bank-issued trust preferred securities | Recurring Basis
    
Investments    
Total available-for-sale securities 0 0
Significant Unobservable Inputs (Level 3) | Equity securities | Recurring Basis
    
Investments    
Total available-for-sale securities $ 0 $ 0