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Fair Value of Financial Assets and Liabilities (Details) (USD $) | 3 Months Ended | 9 Months Ended | 3 Months Ended | 9 Months Ended | 3 Months Ended | 9 Months Ended |  |  |  |  |  |  |  |  | 3 Months Ended |  |  |  |  |  |  |  |
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Sep. 30, 2012 | Sep. 30, 2012 | Sep. 30, 2012 Recurring [Member] Marketable Equity Securities [Member] | Sep. 30, 2011 Recurring [Member] Marketable Equity Securities [Member] | Sep. 30, 2012 Recurring [Member] Marketable Equity Securities [Member] | Sep. 30, 2011 Recurring [Member] Marketable Equity Securities [Member] | Sep. 30, 2012 Recurring [Member] Mortgage Servicing Rights [Member] | Sep. 30, 2011 Recurring [Member] Mortgage Servicing Rights [Member] | Sep. 30, 2012 Recurring [Member] Mortgage Servicing Rights [Member] | Sep. 30, 2011 Recurring [Member] Mortgage Servicing Rights [Member] | Sep. 30, 2012 Recurring [Member] Fair Value [Member] | Dec. 31, 2011 Recurring [Member] Fair Value [Member] | Sep. 30, 2012 Recurring [Member] Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Dec. 31, 2011 Recurring [Member] Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Sep. 30, 2012 Recurring [Member] Significant Other Observable Inputs (Level 2) [Member] | Dec. 31, 2011 Recurring [Member] Significant Other Observable Inputs (Level 2) [Member] | Sep. 30, 2012 Recurring [Member] Significant Unobservable Inputs (Level 3) [Member] | Dec. 31, 2011 Recurring [Member] Significant Unobservable Inputs (Level 3) [Member] | Sep. 30, 2012 Nonrecurring [Member] | Dec. 31, 2011 Nonrecurring [Member] | Sep. 30, 2011 Nonrecurring [Member] | Sep. 30, 2012 Nonrecurring [Member] Fair Value [Member] | Dec. 31, 2011 Nonrecurring [Member] Fair Value [Member] | Sep. 30, 2012 Nonrecurring [Member] Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Dec. 31, 2011 Nonrecurring [Member] Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Sep. 30, 2012 Nonrecurring [Member] Significant Other Observable Inputs (Level 2) [Member] | Dec. 31, 2011 Nonrecurring [Member] Significant Other Observable Inputs (Level 2) [Member] | Sep. 30, 2012 Nonrecurring [Member] Significant Unobservable Inputs (Level 3) [Member] | Dec. 31, 2011 Nonrecurring [Member] Significant Unobservable Inputs (Level 3) [Member]
Available-for-Sale [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. Treasury and government agencies |  |  |  |  |  |  |  |  |  |  | $ 26,655,000 | $ 33,248,000 | $ 0 | $ 0 | $ 26,655,000 | $ 33,248,000 | $ 0 | $ 0 |  |  |  |  |  |  |  |  |  |  |
State and political subdivisions |  |  |  |  |  |  |  |  |  |  | 105,364,000 | 72,144,000 | 0 | 0 | 105,364,000 | 72,144,000 | 0 | 0 |  |  |  |  |  |  |  |  |  |  |
U.S. government sponsored agency mortgage-backed securities |  |  |  |  |  |  |  |  |  |  | 452,731,000 | 400,843,000 | 0 | 507,000 | 452,731,000 | 400,336,000 | 0 | 0 |  |  |  |  |  |  |  |  |  |  |
Marketable equity securities |  |  |  |  |  |  |  |  |  |  | 36,480,000 | 21,163,000 | 36,269,000 | 20,675,000 | 0 | 277,000 | 211,000 | 211,000 |  |  |  |  |  |  |  |  |  |  |
Mortgage servicing rights |  |  |  |  |  |  |  |  |  |  | 2,281,000 | 2,282,000 | 0 | 0 | 0 | 0 | 2,281,000 | 2,282,000 |  |  |  |  |  |  |  |  |  |  |
Assets measured-nonrecurring basis [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Impaired loans (collateral dependent) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 5,927,000 | 7,898,000 | 0 | 0 | 0 | 0 | 5,927,000 | 7,898,000
Other real estate /assets owned |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 7,222,000 | 16,362,000 | 0 | 0 | 0 | 0 | 7,222,000 | 16,362,000
Impaired loan (collateral dependent) [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Impaired loans, fair value adjustments |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 500,000 | 2,100,000 | 500,000 |  |  |  |  |  |  |  |
Other real estate owned [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Other real estate /assets owned, fair value adjustment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 600,000 | 3,700,000 | 700,000 |  |  |  |  |  |  |  |
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Beginning balance |  |  | 211,000 | 211,000 | 211,000 | 211,000 | 2,503,000 | 3,029,000 | 2,282,000 | 3,161,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total recognized gains (losses) Included in net income |  |  | 0 | 0 | 0 | 0 | (257,000) | (763,000) | (85,000) | (957,000) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Issues |  |  | 0 | 0 | 0 | 0 | 170,000 | 127,000 | 510,000 | 378,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Settlements |  |  | 0 | 0 | 0 | 0 | (135,000) | 7,000 | (426,000) | (182,000) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Ending balance |  |  | 211,000 |  | 211,000 |  | 2,281,000 | 2,400,000 | 2,281,000 | 2,400,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total recognized gains (losses) Included in net income |  |  | 0 | 0 | 0 | 0 | (257,000) | (763,000) | (85,000) | (957,000) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total gains, noninterest income | (392,000) | (511,000) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total gains, noninterest expense | $ 0 | $ 0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |

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- Definition This item represent fair value disclosure in U.S. government agency mortgage-backed securities, available-for-sale at fair value. + References No definition available. + Details
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- Definition This element represents the portion of the balance sheet assertion valued at fair value by the entity whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission. This item represents investments accounted for under the equity method of accounting as of the balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Principles Board Opinion (APB) -Number 18 -Paragraph 6 -Subparagraph b -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 323 -SubTopic 10 -Section 25 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6903542&loc=d3e32014-111567 + Details
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- Definition Settlements that have taken place during the period in relation to assets measured at fair value and categorized within Level 3 of the fair value hierarchy. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=7578670&loc=d3e19207-110258 + Details
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