Consolidated Condensed Statements of Comprehensive Income (Parenthetical) (USD $) In Thousands, unless otherwise specified	3 Months Ended
Mar. 31, 2015	Mar. 31, 2014
Statement of Comprehensive Income [Abstract]
Unrealized net holding gain on securities available-for-sale, Tax expense (benefit)	$ 4,232	$ 5,891

Other Comprehensive Income Loss Available For Sale Securities Including Reclassification Adjustment Tax

No definition available.

Name:	prk_OtherComprehensiveIncomeLossAvailableForSaleSecuritiesIncludingReclassificationAdjustmentTax
Namespace Prefix:	prk_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration