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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
Dec. 31, 2012
Dec. 31, 2011
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available-for-sale Securities $ 496,815 $ 414,507
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available-for-sale Securities 21,901  
Significant Other Observable Inputs (Level 2) [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available-for-sale Securities 474,878  
Significant Unobservable Inputs (Level 3) [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available-for-sale Securities 36  
U.S. treasury notes [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available-for-sale Securities 11,909  
U.S. treasury notes [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 11,909  
U.S. treasury 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]    
Available-for-sale Securities 11,909  
Federal agency obligations [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available-for-sale Securities 20,535 24,969
Federal agency obligations [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 20,535  
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 20,535  
Residential mortgage-backed securities [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available-for-sale Securities 53,784 115,364
Residential mortgage-backed securities [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 53,784  
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 53,784  
Commercial mortgage-backed securities [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available-for-sale Securities 9,969  
Commercial mortgage-backed securities [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 9,969  
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 9,969  
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 107,714 69,173
Obligations of U.S. states and political subdivisions [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 107,714  
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 469  
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 107,245  
Trust preferred securities [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available-for-sale Securities 21,249 16,187
Trust preferred securities [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 21,249  
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 21,213  
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 36  
Corporate bonds and notes [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available-for-sale Securities 237,405 173,117
Corporate bonds and notes [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 237,405  
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 237,405  
Collateralized mortgage obligations [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available-for-sale Securities 2,120 1,899
Collateralized mortgage obligations [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 2,120  
Collateralized mortgage 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 2,120  
Asset-backed securities [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available-for-sale Securities 19,742 7,653
Asset-backed securities [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 19,742  
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 19,742  
Certificates of Deposit [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available-for-sale Securities 2,865  
Certificates of Deposit [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 2,865  
Certificates of Deposit [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 2,865  
Equity securities [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available-for-sale Securities 325 262
Equity securities [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available-for-sale Securities 325  
Other securities [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available-for-sale Securities 9,198 5,883
Other securities [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available-for-sale Securities $ 9,198