Financial Instruments With Off-Balance Sheet Risk And Financial Instruments With Concentrations Of Credit Risk (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Risks and Uncertainties [Abstract]
Loan commitments	$ 885,052prk_LoanCommitments	$ 821,795prk_LoanCommitments
Standby letters of credit	$ 12,473	$ 20,590

The total amount of the contingent obligation under letters of credit outstanding as of the reporting date.

No definition available.

Name:	us-gaap_LettersOfCreditOutstandingAmount
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant