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Fair Market Value of Financial Assets and Liabilities (Details) (USD $) | 12 Months Ended
--- | ---
Dec. 31, 2012 | Dec. 31, 2011
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |
Total gains, noninterest income | $ (600,000) | $ (1,405,000)
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 | 211,000 | 211,000
Total recognized gains (losses) Included in net income | 0 | 0
Issues | 0 | 0
Sales | (170,000) | 0
Settlements | 0 | 0
Ending balance | 0 | 211,000
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 | 0 | 0
Recurring [Member] | Mortgage Servicing Rights [Member] |  |
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |
Beginning balance | 2,282,000 | 3,161,000
Total recognized gains (losses) Included in net income | 35,000 | (842,000)
Issues | 641,000 | 526,000
Sales | 0 | 0
Settlements | (594,000) | (563,000)
Ending balance | 2,364,000 | 2,282,000
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 | 35,000 | (842,000)
Recurring [Member] | Fair Value [Member] |  |
Available-for-sale securities [Abstract] |  |
U.S. Treasury and government agencies | 60,915,000 | 33,248,000
State and political subdivisions | 113,221,000 | 72,144,000
U.S. government sponsored agency mortgage-backed securities | 383,581,000 | 400,843,000
Marketable equity securities | 45,626,000 | 21,163,000
Mortgage servicing rights | 2,364,000 | 2,282,000
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 | 507,000
Marketable equity securities | 45,626,000 | 20,675,000
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 | 60,915,000 | 33,248,000
State and political subdivisions | 113,221,000 | 72,144,000
U.S. government sponsored agency mortgage-backed securities | 383,581,000 | 400,336,000
Marketable equity securities | 0 | 277,000
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 | 211,000
Mortgage servicing rights | 2,364,000 | 2,282,000
Nonrecurring [Member] |  |
Impaired loan (collateral dependent) [Abstract] |  |
Impaired loans, fair value adjustments | 1,200,000 | 2,600,000
Other real estate owned [Abstract] |  |
Other real estate /assets owned, fair value adjustment | 2,700,000 | 6,500,000
Nonrecurring [Member] | Fair Value [Member] |  |
Assets measured-nonrecurring basis [Abstract] |  |
Impaired loans (collateral dependent) | 5,465,000 | 7,898,000
Other real estate /assets owned | 13,892,000 | 16,362,000
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) | 5,465,000 | 7,898,000
Other real estate /assets owned | $ 13,892,000 | $ 16,362,000

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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 This item represents the amount of the total realized and unrealized gains or losses for the period which are included in the statement of income (or changes in net assets) in other income; the fair value of which assets was or is measured on a recurring basis using significant unobservable inputs (Level 3). + 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)(1) -URI http://asc.fasb.org/extlink&oid=7578670&loc=d3e19207-110258 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 157 -Paragraph 32 -Subparagraph c(1) -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. + Details
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- Definition Sales 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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- 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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