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Fair Market Value of Financial Assets and Liabilities (Details) (USD $)
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Total gains, noninterest income $ 60,000 $ (600,000)
Total gains, noninterest expense 0 0
Recurring [Member] | Marketable Equity Securities [Member]
    
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Beginning balance 0 211,000
Total recognized gains (losses) Included in net income 0 0
Issues 0 0
Sales 0 (170,000)
Settlements 0 0
Ending balance 0 0
Total gains (losses) for the period included in net income attributable to the change in unrealized gains or losses related to assets still held at the reporting date 0 0
Recurring [Member] | Mortgage Servicing Rights [Member]
    
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Beginning balance 2,364,000 2,282,000
Total recognized gains (losses) Included in net income 788,000 35,000
Issues 854,000 641,000
Sales 0 0
Settlements (582,000) (594,000)
Ending balance 3,424,000 2,364,000
Total gains (losses) for the period included in net income attributable to the change in unrealized gains or losses related to assets still held at the reporting date 788,000 35,000
Recurring [Member] | Fair Value [Member]
    
Available-for-sale securities [Abstract]    
U.S. Treasury and government agencies 60,610,000 60,915,000
State and political subdivisions 116,703,000 113,221,000
U.S. government sponsored agency mortgage-backed securities 379,310,000 383,581,000
Marketable equity securities 52,782,000 45,626,000
Mortgage servicing rights 3,424,000 2,364,000
Recurring [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]
    
Available-for-sale securities [Abstract]    
U.S. Treasury and government agencies 0 0
State and political subdivisions 0 0
U.S. government sponsored agency mortgage-backed securities 0 0
Marketable equity securities 52,782,000 45,626,000
Mortgage servicing rights 0 0
Recurring [Member] | Significant Other Observable Inputs (Level 2) [Member]
    
Available-for-sale securities [Abstract]    
U.S. Treasury and government agencies 60,610,000 60,915,000
State and political subdivisions 116,703,000 113,221,000
U.S. government sponsored agency mortgage-backed securities 379,310,000 383,581,000
Marketable equity securities 0 0
Mortgage servicing rights 0 0
Recurring [Member] | Significant Unobservable Inputs (Level 3) [Member]
    
Available-for-sale securities [Abstract]    
U.S. Treasury and government agencies 0 0
State and political subdivisions 0 0
U.S. government sponsored agency mortgage-backed securities 0 0
Marketable equity securities 0 0
Mortgage servicing rights 3,424,000 2,364,000
Nonrecurring [Member]
    
Impaired loan (collateral dependent) [Abstract]    
Impaired loans, fair value adjustments 600,000 1,200,000
Other real estate owned [Abstract]    
Other real estate /assets owned, fair value adjustment 2,500,000 2,700,000
Nonrecurring [Member] | Fair Value [Member]
    
Assets measured-nonrecurring basis [Abstract]    
Impaired loans (collateral dependent) 6,830,000 5,465,000
Other real estate /assets owned 11,111,000 13,892,000
Nonrecurring [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]
    
Assets measured-nonrecurring basis [Abstract]    
Impaired loans (collateral dependent) 0 0
Other real estate /assets owned 0 0
Nonrecurring [Member] | Significant Other Observable Inputs (Level 2) [Member]
    
Assets measured-nonrecurring basis [Abstract]    
Impaired loans (collateral dependent) 0 0
Other real estate /assets owned 0 0
Nonrecurring [Member] | Significant Unobservable Inputs (Level 3) [Member]
    
Assets measured-nonrecurring basis [Abstract]    
Impaired loans (collateral dependent) 6,830,000 5,465,000
Other real estate /assets owned $ 11,111,000 $ 13,892,000