Earnings Per Common Share (Narrative) (Details) (USD $)	3 Months Ended		9 Months Ended
	Sep. 30, 2011	Sep. 30, 2010	Sep. 30, 2011	Sep. 30, 2010	Dec. 31, 2010
Shares outstanding under the Incentive Stock Option Plan	74,570	82,175	74,570	82,175	78,075
Warrants to purchase common shares outstanding related to common stock issuances	227,376	227,376	227,376	227,376
Options and warrants not included in computation of diluted earnings per common shares	338,743	420,778	133,343	604,010
Dilutive effect of Capital Purchase Plan warrant			1,722
Exercise price of Capital Purchase Plan warrant to purchase common shares			$ 65.97
Park National Corp [Member]
Warrants to purchase common shares outstanding related to common stock issuances	35,992	80,500	35,992	80,500