Allowance For Credit Losses (Activity In The Allowance For Loan Losses) (Details) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	$ 86,575	$ 87,206	$ 83,745	$ 85,379
Financing Receivable, Allowance for Credit Loss, Writeoff	6,554	2,293	12,891	7,213
Financing Receivable, Allowance for Credit Loss, Recovery	1,901	1,269	5,775	4,958
Financing Receivable, Allowance for Credit Loss, Writeoff, after Recovery, Total	4,653	1,024	7,116	2,255
Provision for Loan, Lease, and Other Losses	5,315	(1,580)	10,608	1,095
Financing Receivable, Allowance for Credit Loss, Excluding Accrued Interest	87,237	84,602	87,237	84,602
Ending balance	87,237	84,602	87,237	84,602
Cumulative Effect, Period of Adoption, Adjustment
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance				383
Financing Receivable, Allowance for Credit Loss, Excluding Accrued Interest
Commercial Financial And Agricultural [Member]
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	16,663	16,278	15,496	16,987
Financing Receivable, Allowance for Credit Loss, Writeoff	3,151	218	3,657	755
Financing Receivable, Allowance for Credit Loss, Recovery	79	79	340	209
Financing Receivable, Allowance for Credit Loss, Writeoff, after Recovery, Total	3,072	139	3,317	546
Provision for Loan, Lease, and Other Losses	284	(1,171)	1,696	(1,695)
Financing Receivable, Allowance for Credit Loss, Excluding Accrued Interest	13,875	14,968	13,875	14,968
Ending balance	13,875	14,968	13,875	14,968
Commercial Financial And Agricultural [Member] \| Cumulative Effect, Period of Adoption, Adjustment
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance				222
Financing Receivable, Allowance for Credit Loss, Excluding Accrued Interest
Commercial Real Estate [Member]
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	16,855	19,141	16,374	17,829
Financing Receivable, Allowance for Credit Loss, Writeoff	40	0	40	530
Financing Receivable, Allowance for Credit Loss, Recovery	223	3	250	235
Financing Receivable, Allowance for Credit Loss, Writeoff, after Recovery, Total	(183)	(3)	(210)	295
Provision for Loan, Lease, and Other Losses	1,818	(526)	2,272	903
Financing Receivable, Allowance for Credit Loss, Excluding Accrued Interest	18,856	18,618	18,856	18,618
Ending balance	18,856	18,618	18,856	18,618
Commercial Real Estate [Member] \| Cumulative Effect, Period of Adoption, Adjustment
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance				181
Financing Receivable, Allowance for Credit Loss, Excluding Accrued Interest
Construction Real Estate [Member]
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	5,867	4,886	5,227	5,550
Financing Receivable, Allowance for Credit Loss, Writeoff	0	0	0	0
Financing Receivable, Allowance for Credit Loss, Recovery	25	40	1,058	548
Financing Receivable, Allowance for Credit Loss, Writeoff, after Recovery, Total	(25)	(40)	(1,058)	(548)
Provision for Loan, Lease, and Other Losses	194	373	(199)	(799)
Financing Receivable, Allowance for Credit Loss, Excluding Accrued Interest	6,086	5,299	6,086	5,299
Ending balance	6,086	5,299	6,086	5,299
Construction Real Estate [Member] \| Cumulative Effect, Period of Adoption, Adjustment
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance				0
Financing Receivable, Allowance for Credit Loss, Excluding Accrued Interest
Residential Real Estate [Member]
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	19,450	18,419	18,818	16,831
Financing Receivable, Allowance for Credit Loss, Writeoff	0	1	31	44
Financing Receivable, Allowance for Credit Loss, Recovery	40	8	307	479
Financing Receivable, Allowance for Credit Loss, Writeoff, after Recovery, Total	(40)	(7)	(276)	(435)
Provision for Loan, Lease, and Other Losses	768	(1,437)	1,164	(257)
Financing Receivable, Allowance for Credit Loss, Excluding Accrued Interest	20,258	16,989	20,258	16,989
Ending balance	20,258	16,989	20,258	16,989
Residential Real Estate [Member] \| Cumulative Effect, Period of Adoption, Adjustment
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance				(20)
Financing Receivable, Allowance for Credit Loss, Excluding Accrued Interest
Consumer [Member]
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	27,579	28,370	27,713	28,021
Financing Receivable, Allowance for Credit Loss, Writeoff	3,363	2,074	9,163	5,884
Financing Receivable, Allowance for Credit Loss, Recovery	1,534	1,139	3,820	3,487
Financing Receivable, Allowance for Credit Loss, Writeoff, after Recovery, Total	1,829	935	5,343	2,397
Provision for Loan, Lease, and Other Losses	2,247	1,185	5,627	2,996
Financing Receivable, Allowance for Credit Loss, Excluding Accrued Interest	27,997	28,620	27,997	28,620
Ending balance	27,997	28,620	27,997	28,620
Consumer [Member] \| Cumulative Effect, Period of Adoption, Adjustment
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance				0
Financing Receivable, Allowance for Credit Loss, Excluding Accrued Interest
Finance Leases Portfolio Segment [Member]
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	161	112	117	161
Financing Receivable, Allowance for Credit Loss, Writeoff	0	0	0	0
Financing Receivable, Allowance for Credit Loss, Recovery	0	0	0	0
Financing Receivable, Allowance for Credit Loss, Writeoff, after Recovery, Total	0	0	0	0
Provision for Loan, Lease, and Other Losses	4	(4)	48	(53)
Financing Receivable, Allowance for Credit Loss, Excluding Accrued Interest	165	108	165	108
Ending balance	$ 165	$ 108	$ 165	108
Finance Leases Portfolio Segment [Member] \| Cumulative Effect, Period of Adoption, Adjustment
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance				$ 0
Financing Receivable, Allowance for Credit Loss, Excluding Accrued Interest

Amount excluding accrued interest, of allowance for credit loss on financing receivable. Excludes net investment in lease.

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 326
-SubTopic 20
-Name Accounting Standards Codification
-Section 45
-Paragraph 1
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479344/326-20-45-1

+ Details

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

- Definition

Amount, after recovery, of writeoff of financing receivable, charged against allowance for credit loss.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name Regulation S-K (SK)
-Number 229
-Section 1405
-Paragraph a
-Subparagraph (4)
-Publisher SEC

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 326
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 13
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479319/326-20-50-13

Reference 3: http://www.xbrl.org/2003/role/exampleRef
-Topic 326
-SubTopic 20
-Name Accounting Standards Codification
-Section 55
-Paragraph 79
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479294/326-20-55-79

+ Details

Name:	us-gaap_FinancingReceivableAllowanceForCreditLossWriteoffAfterRecovery
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Amount of increase in allowance for credit loss on financing receivable from recovery.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/otherTransitionRef
-Topic 310
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 11B
-Subparagraph (c)(4)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481962/310-10-50-11B

Reference 2: http://www.xbrl.org/2003/role/exampleRef
-Topic 326
-SubTopic 20
-Name Accounting Standards Codification
-Section 55
-Paragraph 79
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479294/326-20-55-79

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Topic 326
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 13
-Subparagraph (e)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479319/326-20-50-13

+ Details

Name:	us-gaap_FinancingReceivableAllowanceForCreditLossesRecovery
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

+ References

No definition available.

+ Details

Name:	us-gaap_FinancingReceivableAllowanceForCreditLossesRollForward
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Amount of writeoff of financing receivable, charged against allowance for credit loss.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/otherTransitionRef
-Topic 310
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 11B
-Subparagraph (c)(3)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481962/310-10-50-11B

Reference 2: http://www.xbrl.org/2003/role/exampleRef
-Topic 326
-SubTopic 20
-Name Accounting Standards Codification
-Section 55
-Paragraph 79
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479294/326-20-55-79

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Topic 326
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 6
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479319/326-20-50-6

Reference 4: http://www.xbrl.org/2003/role/disclosureRef
-Topic 326
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 13
-Subparagraph (d)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479319/326-20-50-13

+ Details

Name:	us-gaap_FinancingReceivableAllowanceForCreditLossesWriteOffs
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Amount of credit loss expense (reversal of expense) for financing receivable.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 326
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 13
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479319/326-20-50-13

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 942
-SubTopic 220
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-04(11))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147478524/942-220-S99-1

+ Details

Name:	us-gaap_ProvisionForLoanLossesExpensed
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Details

Name:	srt_CumulativeEffectPeriodOfAdoptionAxis=srt_CumulativeEffectPeriodOfAdoptionAdjustmentMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=prk_CommercialFinancialAndAgriculturalMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=us-gaap_CommercialRealEstatePortfolioSegmentMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=prk_ConstructionRealEstateMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=us-gaap_ResidentialPortfolioSegmentMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=us-gaap_ConsumerPortfolioSegmentMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=us-gaap_FinanceLeasesPortfolioSegmentMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: