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Fair Value Disclosures (Details) (USD $)
Sep. 30, 2012
Dec. 31, 2011
Sep. 30, 2011
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Allowance for OREO losses $ 479,000 $ 436,000 $ 602,000
Allowance for loan losses 5,062,000 2,058,000 1,627,000
Mortgage servicing rights 1,129,000 1,581,000 1,541,000
Fair Value, Inputs, Level 1 [Member]
      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Mortgage servicing rights 0    
Loans held for sale 0    
Fair Value, Inputs, Level 2 [Member]
      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Mortgage servicing rights 1,129,000    
Loans held for sale 0    
Fair Value, Inputs, Level 3 [Member]
      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Mortgage servicing rights 0    
Loans held for sale 0    
Fair Value, Measurements, Recurring [Member]
      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
U.S. Treasury and agency     16,494,000
Mortgage-backed securities 189,437,000 198,232,000 235,038,000
State and municipal bonds 108,955,000 85,726,000 74,039,000
Corporate securities 0 811,000 779,000
Other equity securities 1,508,000 1,433,000 432,000
Total assets 299,900,000 286,202,000 326,782,000
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member]
      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
U.S. Treasury and agency     0
Mortgage-backed securities 0 0 0
State and municipal bonds 0 0 0
Corporate securities 0 0 0
Other equity securities 0 0 0
Total assets 0 0 0
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member]
      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
U.S. Treasury and agency     16,494,000
Mortgage-backed securities 189,437,000 198,232,000 235,038,000
State and municipal bonds 108,955,000 85,726,000 74,039,000
Corporate securities 0 811,000 779,000
Other equity securities 1,508,000 1,433,000 432,000
Total assets 299,900,000 286,202,000 326,782,000
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member]
      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
U.S. Treasury and agency     0
Mortgage-backed securities 0 0 0
State and municipal bonds 0 0 0
Corporate securities 0 0 0
Other equity securities 0 0 0
Total assets 0 0 0
Fair Value, Measurements, Nonrecurring [Member]
      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Total assets 23,591,000 17,840,000 16,287,000
Mortgage servicing rights 1,129,000 1,581,000 1,541,000
Loans held for sale 0 0 230,000
Other real estate owned 5,471,000 4,094,000 6,310,000
Impaired loans 16,991,000 12,165,000 8,206,000
Fair Value, Measurements, Nonrecurring [Member] | Fair Value, Inputs, Level 1 [Member]
      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Total assets 0 0 0
Mortgage servicing rights 0 0 0
Loans held for sale 0 0 0
Other real estate owned 0 0 0
Impaired loans 0 0 0
Fair Value, Measurements, Nonrecurring [Member] | Fair Value, Inputs, Level 2 [Member]
      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Total assets 23,591,000 17,840,000 16,287,000
Mortgage servicing rights 1,129,000 1,581,000 1,541,000
Loans held for sale 0 0 230,000
Other real estate owned 5,471,000 4,094,000 6,310,000
Impaired loans 16,991,000 12,165,000 8,206,000
Fair Value, Measurements, Nonrecurring [Member] | Fair Value, Inputs, Level 3 [Member]
      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Total assets 0 0 0
Mortgage servicing rights 0 0 0
Loans held for sale 0 0 0
Other real estate owned 0 0 0
Impaired loans $ 0 $ 0 $ 0