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Stock Option Plan | 12 Months Ended
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Dec. 31, 2011
Stock Option Plan [Abstract] |
Stock Option Plan | 12. Stock Option Plan The Park National Corporation 2005 Incentive Stock Option Plan (the "2005 Plan") was adopted by the Board of Directors of Park on January 18, 2005, and was approved by the shareholders at the Annual Meeting of Shareholders on April 18, 2005. Under the 2005 Plan, 1,500,000 common shares are authorized for delivery upon the exercise of incentive stock options. All of the common shares delivered upon the exercise of incentive stock options granted under the 2005 Plan are to be treasury shares. At December 31, 2011, 1,425,980 common shares were available for future grants under the 2005 Plan. Under the terms of the 2005 Plan, incentive stock options may be granted at a price not less than the fair market value at the date of the grant, and for an option term of up to five years. No additional incentive stock options may be granted under the 2005 Plan after January 17, 2015. The fair value of each incentive stock option granted is estimated on the date of grant using a closed form option valuation (Black-Scholes) model. Expected volatilities are based on historical volatilities of Park's common stock. The Corporation uses historical data to estimate option exercise behavior. The expected term of incentive stock options granted is based on historical data and represents the period of time that options granted are expected to be outstanding, which takes into account that the options are not transferable. The risk-free interest rate for the expected term of the incentive stock options is based on the U.S. Treasury yield curve in effect at the time of the grant. The activity in the 2005 Plan is listed in the following table for 2011:
|  | Number |  |  | Weighted Average Exercise Price per Share |
January 1, 2011 |  |  | 78,075 |  |  | $ | 74.96 |
Granted |  |  | — |  |  |  | — |
Exercised |  |  | — |  |  |  | — |
Forfeited/Expired |  |  | 4,055 |  |  |  | 74.96 |
December 31, 2011 |  |  | 74,020 |  |  | $ | 74.96 |
Exercisable at year end |  |  |  |  |  |  | 74,020 |
Weighted-average remaining contractual life |  |  |  |  |  |  | 0.94years |
Aggregate intrinsic value |  |  |  |  |  | $ | 0 |
There were no options granted or exercised in 2011, 2010 or 2009. Additionally, no expense was recognized for 2011, 2010 or 2009.

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- Definition The entire disclosure for compensation-related costs for equity-based compensation, which may include disclosure of policies, compensation plan details, allocation of equity compensation, incentive distributions, equity-based arrangements to obtain goods and services, deferred compensation arrangements, employee stock ownership plan details and employee stock purchase plan details. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5444-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Statement of Position (SOP) -Number 93-6 -Paragraph 53 -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 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 14 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 123R -Paragraph 64, 65, A240 -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 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 40 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6418621&loc=d3e17540-113929 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5047-113901 Reference 7: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 50 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6406099&loc=d3e25284-112666 Reference 8: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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