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Fair Market Value of Financial Assets and Liabilities (Details) (USD $) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2013 | Mar. 31, 2012 | Dec. 31, 2012
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |
Total gains, noninterest income | $ (69,000) | $ 207,000 |
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 | 211,000
Total recognized gains (losses) Included in net income | 0 | 0 |
Issues | 0 | 0 |
Settlements | 0 | 0 |
Ending balance | 0 | 211,000 |
Total gains for the period included in net income | 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 | 2,282,000
Total recognized gains (losses) Included in net income | 117,000 | 341,000 |
Issues | 357,000 | 151,000 |
Settlements | (186,000) | (134,000) |
Ending balance | 2,652,000 | 2,640,000 |
Total gains for the period included in net income | 117,000 | 341,000 |
Recurring [Member] | Fair Value [Member] |  |  |
Available-for-sale securities [Abstract] |  |  |
U.S. Treasury and government agencies | 61,263,000 |  | 60,915,000
State and political subdivisions | 120,448,000 |  | 113,221,000
U.S. government sponsored agency mortgage-backed securities | 440,470,000 |  | 383,581,000
Marketable equity securities | 55,329,000 |  | 45,626,000
Mortgage servicing rights | 2,652,000 |  | 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 | 55,329,000 |  | 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 | 61,263,000 |  | 60,915,000
State and political subdivisions | 120,448,000 |  | 113,221,000
U.S. government sponsored agency mortgage-backed securities | 440,470,000 |  | 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 | 2,652,000 |  | 2,364,000
Nonrecurring [Member] |  |  |
Impaired loan (collateral dependent) [Abstract] |  |  |
Impaired loans, fair value adjustments | 500,000 | 100,000 | 500,000
Other real estate owned [Abstract] |  |  |
Other real estate /assets owned, fair value adjustment | 1,100,000 | 200,000 | 1,800,000
Nonrecurring [Member] | Fair Value [Member] |  |  |
Assets measured-nonrecurring basis [Abstract] |  |  |
Impaired loans (collateral dependent) | 2,326,000 |  | 5,465,000
Other real estate /assets owned | 4,365,000 |  | 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) | 2,326,000 |  | 5,465,000
Other real estate /assets owned | $ 4,365,000 |  | $ 13,892,000

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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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