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Fair Value Disclosures (Details) (USD $)
Mar. 31, 2012
Dec. 31, 2011
Mar. 31, 2011
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
U.S. Treasury and agency $ 0 $ 0 $ 15,943,000
Mortgage-backed securities 232,115,000 198,232,000 253,110,000
State and municipal bonds 83,162,000 85,726,000 55,081,000
Corporate securities   811,000 923,000
Other equity securities 1,834,000 1,433,000 394,000
Total assets 317,111,000 286,202,000 325,451,000
Allowance for loan losses 0 0 0
Mortgage servicing rights 994,000 1,581,000 2,205,000
Loans held for sale 184,000 0 450,000
Other real estate owned 4,214,000 4,094,000 4,575,000
Impaired loans 12,082,000 12,165,000 7,002,000
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 0 0
Mortgage-backed securities 0 0 0
State and municipal bonds 0 0 0
Corporate securities   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 0 0 15,943,000
Mortgage-backed securities 232,115,000 198,232,000 253,110,000
State and municipal bonds 83,162,000 85,726,000 55,081,000
Corporate securities   811,000 923,000
Other equity securities 1,834,000 1,433,000 394,000
Total assets 317,111,000 286,202,000 325,451,000
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 0 0
Mortgage-backed securities 0 0 0
State and municipal bonds 0 0 0
Corporate securities   0 0
Other equity securities 0 0 0
Total assets 0 0 0
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
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 17,474,000 17,840,000 14,232,000
Loans held for sale 184,000 0 450,000
Other real estate owned 4,214,000 4,094,000 4,575,000
Impaired loans 12,082,000 12,165,000 7,002,000
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  
Allowance for OREO losses     0
Loans held for sale 0 0 0
Other real estate owned 0 0 0
Impaired loans $ 0 $ 0 $ 0