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Subordinated Debentures/Notes (Details) (USD $)
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 23, 2009
purchaser
Apr. 20, 2012
purchaser
Subordinated notes $ 45,000,000us-gaap_SubordinatedDebt $ 80,250,000us-gaap_SubordinatedDebt    
Number of purchasers     38prk_NumberOfPurchasers  
Trust I        
Preferred securities issued 15,000,000us-gaap_ProceedsFromIssuanceOfTrustPreferredSecurities
/ us-gaap_ScheduleOfSharesSubjectToMandatoryRedemptionBySettlementTermsAxis
= prk_TrustIPreferredSecuritiesMember
     
Junior subordinated notes        
Junior subordinated debt purchased by Trust I 15,500,000prk_JuniorSubordinatedDebtPurchasedByTrust
/ us-gaap_ScheduleOfSharesSubjectToMandatoryRedemptionBySettlementTermsAxis
= us-gaap_JuniorSubordinatedDebtMember
     
Trust preferred securities        
Variable rate basis three-month LIBOR plus 148 basis points      
Basis spread on variable rate (percent) 1.48%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
/ us-gaap_ScheduleOfSharesSubjectToMandatoryRedemptionBySettlementTermsAxis
= prk_TrustPreferredSecuritiesMember
     
Subordinated note        
Subordinated notes principal amount 35,250,000prk_SubordinatedNotesPrincipalAmount
/ us-gaap_ScheduleOfSharesSubjectToMandatoryRedemptionBySettlementTermsAxis
= prk_SubordinatedNoteMember
     
Portion of principal amount purchased by related parties 14,050,000prk_PortionOfPrincipalAmountPurchasedByRelatedParties
/ us-gaap_ScheduleOfSharesSubjectToMandatoryRedemptionBySettlementTermsAxis
= prk_SubordinatedNoteMember
     
Interest rate 10.00%us-gaap_SubordinatedBorrowingInterestRate
/ us-gaap_ScheduleOfSharesSubjectToMandatoryRedemptionBySettlementTermsAxis
= prk_SubordinatedNoteMember
     
Subordinated debt | 7% Subordinated notes due April 20, 2022        
Subordinated borrowing, number of purchasers       56prk_SubordinatedBorrowingNumberOfPurchasers
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SubordinatedDebtMember
/ us-gaap_SubordinatedBorrowingAxis
= prk_A7PercentSubordinatedNotesDueApril202022MemberMember
Aggregate principal amount       $ 30,000,000us-gaap_DebtInstrumentFaceAmount
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SubordinatedDebtMember
/ us-gaap_SubordinatedBorrowingAxis
= prk_A7PercentSubordinatedNotesDueApril202022MemberMember
Interest rate 7.00%us-gaap_SubordinatedBorrowingInterestRate
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SubordinatedDebtMember
/ us-gaap_SubordinatedBorrowingAxis
= prk_A7PercentSubordinatedNotesDueApril202022MemberMember
     
Purchase price as a percentage of principal amount       100.00%prk_DebtInstrumentPurchasePercentage
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SubordinatedDebtMember
/ us-gaap_SubordinatedBorrowingAxis
= prk_A7PercentSubordinatedNotesDueApril202022MemberMember
Repurchase amount as a percentage of principal       100.00%prk_DebtInstrumentRepurchaseAmountAsPercentageOfPrincipal
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SubordinatedDebtMember
/ us-gaap_SubordinatedBorrowingAxis
= prk_A7PercentSubordinatedNotesDueApril202022MemberMember