Consolidated Condensed Statements of Comprehensive Income (Parenthetical) (USD $) In Thousands, unless otherwise specified	3 Months Ended	9 Months Ended
Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Statement of Comprehensive Income [Abstract]
Unrealized net holding (loss) gain on securities available-for-sale, Tax expense (benefit)	$ (1,564)	$ (5,931)	$ 11,369	$ (18,270)

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