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Fair Value Disclosures - Assets and Liabilities Recorded at Fair Value on a Recurring Basis (Details) (USD $)
Sep. 30, 2013
Dec. 31, 2012
Sep. 30, 2012
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Securities available for sale $ 317,900,000 $ 291,614,000 $ 299,900,000
Fair Value, Measurements, Recurring [Member] | Level 1 [Member]
      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Securities available for sale 0 0 0
Fair Value, Measurements, Recurring [Member] | Level 2 [Member]
      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Securities available for sale 317,900,000 291,614,000 299,900,000
Fair Value, Measurements, Recurring [Member] | Level 3 [Member]
      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Securities available for sale 0 0 0
Fair Value, Measurements, Recurring [Member] | Total Fair Value [Member]
      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Securities available for sale 317,900,000 291,614,000 299,900,000
Collateralized Mortgage Backed Securities [Member]
      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Securities available for sale 188,256,000 169,093,000 189,437,000
Collateralized Mortgage Backed Securities [Member] | Fair Value, Measurements, Recurring [Member] | Level 1 [Member]
      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Securities available for sale 0 0 0
Collateralized Mortgage Backed Securities [Member] | Fair Value, Measurements, Recurring [Member] | Level 2 [Member]
      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Securities available for sale 188,256,000 169,093,000 189,437,000
Collateralized Mortgage Backed Securities [Member] | Fair Value, Measurements, Recurring [Member] | Level 3 [Member]
      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Securities available for sale 0 0 0
Collateralized Mortgage Backed Securities [Member] | Fair Value, Measurements, Recurring [Member] | Total Fair Value [Member]
      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Securities available for sale 188,256,000 169,093,000 189,437,000
US States and Political Subdivisions Debt Securities [Member]
      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Securities available for sale 127,971,000 120,944,000 108,955,000
US States and Political Subdivisions Debt Securities [Member] | Fair Value, Measurements, Recurring [Member] | Level 1 [Member]
      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Securities available for sale 0 0 0
US States and Political Subdivisions Debt Securities [Member] | Fair Value, Measurements, Recurring [Member] | Level 2 [Member]
      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Securities available for sale 127,971,000 120,944,000 108,955,000
US States and Political Subdivisions Debt Securities [Member] | Fair Value, Measurements, Recurring [Member] | Level 3 [Member]
      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Securities available for sale 0 0 0
US States and Political Subdivisions Debt Securities [Member] | Fair Value, Measurements, Recurring [Member] | Total Fair Value [Member]
      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Securities available for sale 127,971,000 120,944,000 108,955,000
Equity Securities, Other [Member]
      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Securities available for sale 1,673,000 1,577,000 1,508,000
Equity Securities, Other [Member] | Fair Value, Measurements, Recurring [Member] | Level 1 [Member]
      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Securities available for sale 0 0 0
Equity Securities, Other [Member] | Fair Value, Measurements, Recurring [Member] | Level 2 [Member]
      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Securities available for sale 1,673,000 1,577,000 1,508,000
Equity Securities, Other [Member] | Fair Value, Measurements, Recurring [Member] | Level 3 [Member]
      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Securities available for sale 0 0 0
Equity Securities, Other [Member] | Fair Value, Measurements, Recurring [Member] | Total Fair Value [Member]
      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Securities available for sale $ 1,673,000 $ 1,577,000 $ 1,508,000