Consolidated Condensed Statements of Comprehensive Income (Parenthetical) - USD ($) $ in Thousands	3 Months Ended
Mar. 31, 2017	Mar. 31, 2016
Statement of Comprehensive Income [Abstract]
Unrealized net holding gain on securities available-for-sale, Tax expense	$ 550	$ 6,290

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