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Fair Market Value of Financial Assets and Liabilities (Details) (USD $) | 3 Months Ended | 6 Months Ended | 3 Months Ended | 6 Months Ended | 3 Months Ended | 6 Months Ended |  |  |  |  |  |  |  |  | 6 Months Ended | 12 Months Ended |  |  |  |  |  |  |  |
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Jun. 30, 2013 | Jun. 30, 2012 | Jun. 30, 2013 | Jun. 30, 2012 | Jun. 30, 2013 Recurring [Member] Marketable Equity Securities [Member] | Jun. 30, 2012 Recurring [Member] Marketable Equity Securities [Member] | Jun. 30, 2013 Recurring [Member] Marketable Equity Securities [Member] | Jun. 30, 2012 Recurring [Member] Marketable Equity Securities [Member] | Jun. 30, 2013 Recurring [Member] Mortgage Servicing Rights [Member] | Jun. 30, 2012 Recurring [Member] Mortgage Servicing Rights [Member] | Jun. 30, 2013 Recurring [Member] Mortgage Servicing Rights [Member] | Jun. 30, 2012 Recurring [Member] Mortgage Servicing Rights [Member] | Jun. 30, 2013 Recurring [Member] Fair Value [Member] | Dec. 31, 2012 Recurring [Member] Fair Value [Member] | Jun. 30, 2013 Recurring [Member] Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Dec. 31, 2012 Recurring [Member] Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Jun. 30, 2013 Recurring [Member] Significant Other Observable Inputs (Level 2) [Member] | Dec. 31, 2012 Recurring [Member] Significant Other Observable Inputs (Level 2) [Member] | Jun. 30, 2013 Recurring [Member] Significant Unobservable Inputs (Level 3) [Member] | Dec. 31, 2012 Recurring [Member] Significant Unobservable Inputs (Level 3) [Member] | Jun. 30, 2013 Nonrecurring [Member] | Jun. 30, 2012 Nonrecurring [Member] | Dec. 31, 2012 Nonrecurring [Member] | Jun. 30, 2013 Nonrecurring [Member] Fair Value [Member] | Dec. 31, 2012 Nonrecurring [Member] Fair Value [Member] | Jun. 30, 2013 Nonrecurring [Member] Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Dec. 31, 2012 Nonrecurring [Member] Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Jun. 30, 2013 Nonrecurring [Member] Significant Other Observable Inputs (Level 2) [Member] | Dec. 31, 2012 Nonrecurring [Member] Significant Other Observable Inputs (Level 2) [Member] | Jun. 30, 2013 Nonrecurring [Member] Significant Unobservable Inputs (Level 3) [Member] | Dec. 31, 2012 Nonrecurring [Member] Significant Unobservable Inputs (Level 3) [Member]
Available-for-sale securities [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. Treasury and government agencies |  |  |  |  |  |  |  |  |  |  |  |  | $ 67,608,000 | $ 60,915,000 | $ 0 | $ 0 | $ 67,608,000 | $ 60,915,000 | $ 0 | $ 0 |  |  |  |  |  |  |  |  |  |  |
State and political subdivisions |  |  |  |  |  |  |  |  |  |  |  |  | 115,942,000 | 113,221,000 | 0 | 0 | 115,942,000 | 113,221,000 | 0 | 0 |  |  |  |  |  |  |  |  |  |  |
U.S. government sponsored agency mortgage-backed securities |  |  |  |  |  |  |  |  |  |  |  |  | 450,336,000 | 383,581,000 | 0 | 0 | 450,336,000 | 383,581,000 | 0 | 0 |  |  |  |  |  |  |  |  |  |  |
Marketable equity securities |  |  |  |  |  |  |  |  |  |  |  |  | 53,476,000 | 45,626,000 | 53,476,000 | 45,626,000 | 0 | 0 | 0 | 0 |  |  |  |  |  |  |  |  |  |  |
Mortgage servicing rights |  |  |  |  |  |  |  |  |  |  |  |  | 3,222,000 | 2,364,000 | 0 | 0 | 0 | 0 | 3,222,000 | 2,364,000 |  |  |  |  |  |  |  |  |  |  |
Assets measured-nonrecurring basis [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Impaired loans (collateral dependent) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 5,419,000 | 5,465,000 | 0 | 0 | 0 | 0 | 5,419,000 | 5,465,000
Other real estate /assets owned |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 9,587,000 | 13,892,000 | 0 | 0 | 0 | 0 | 9,587,000 | 13,892,000
Impaired loan (collateral dependent) [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Impaired loans, fair value adjustments |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,500,000 | 100,000 | 500,000 |  |  |  |  |  |  |  |
Other real estate owned [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Other real estate /assets owned, fair value adjustment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 600,000 | 200,000 | 1,800,000 |  |  |  |  |  |  |  |
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Beginning balance |  |  |  |  | 0 | 211,000 | 0 | 211,000 | 2,652,000 | 2,640,000 | 2,364,000 | 2,282,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total recognized gains (losses) Included in net income |  |  |  |  | 0 | 0 | 0 | 0 | 529,000 | (169,000) | 646,000 | 172,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Issues |  |  |  |  | 0 | 0 | 0 | 0 | 205,000 | 189,000 | 562,000 | 340,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Settlements |  |  |  |  | 0 | 0 | 0 | 0 | (164,000) | (157,000) | (350,000) | (291,000) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Ending balance |  |  |  |  | 0 | 211,000 | 0 | 211,000 | 3,222,000 | 2,503,000 | 3,222,000 | 2,503,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total gains for the period included in net income |  |  |  |  | 0 | 0 | 0 | 0 | 529,000 | (169,000) | 646,000 | 172,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total gains, noninterest income | 365,000 | (326,000) | 296,000 | (119,000) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total gains, noninterest expense | $ 0 | $ 0 | $ 0 | $ 0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |

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