Capital Ratios (Details) $ in Thousands	Dec. 31, 2020 USD ($)	Dec. 31, 2019 USD ($)
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Capital Conservation Buffer	2.50%
Park National Bank
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Tier One Leverage Capital to Average Assets	0.0859	0.0862
Tier One Risk Based Capital to Risk Weighted Assets	0.1066	0.1105
Common Equity Tier 1	0.1066	0.1105
Capital to Risk Weighted Assets	0.1216	0.1225
Leverage Capital Required For Capital Adequacy To Average Total Assets	0.0400	0.0400
Tier One Risk Based Capital Required for Capital Adequacy to Risk Weighted Assets	0.0600	0.0600
Common Equity Tier 1 Capital Required For Capital Adequacy To Average Total Assets	4.50%	4.50%
Capital Required for Capital Adequacy to Risk Weighted Assets	0.0800	0.0800
Leverage Capital Required To Be Well Capitalized To Average Total Assets	0.0500	0.0500
Tier One Risk Based Capital Required to be Well Capitalized to Risk Weighted Assets	0.0800	0.0800
Common Equity Tier 1 Capital Required To Be Well Capitalized To Average Total Assets	6.50%	6.50%
Capital Required to be Well Capitalized to Risk Weighted Assets	0.1000	0.1000
Risk Based Capital	$ 891,585	$ 810,880
Capital Required for Capital Adequacy	586,764	529,480
Capital Required to be Well Capitalized	733,455	661,850
Tier One Risk Based Capital	782,148	731,071
Tier One Risk Based Capital Required for Capital Adequacy	440,073	397,110
Tier One Risk Based Capital Required to be Well Capitalized	586,764	529,480
Tier One Leverage Capital	782,148	731,071
Tier One Leverage Capital Required for Capital Adequacy	364,079	339,092
Tier One Leverage Capital Required to be Well Capitalized	455,098	423,866
Common Equity Tier One Capital	782,148	731,071
Common Equity Tier One Capital Required for Capital Adequacy	330,055	297,832
Common Equity Tier One Capital Required to be Well-Capitalized	$ 476,746	$ 430,202
Park
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Tier One Leverage Capital to Average Assets	0.0963	0.0964
Tier One Risk Based Capital to Risk Weighted Assets	0.1192	0.1233
Common Equity Tier 1	0.1172	0.1211
Capital to Risk Weighted Assets	0.1543	0.1319
Leverage Capital Required For Capital Adequacy To Average Total Assets	0.0400	0.0400
Tier One Risk Based Capital Required for Capital Adequacy to Risk Weighted Assets	0.0600	0.0600
Common Equity Tier 1 Capital Required For Capital Adequacy To Average Total Assets	4.50%	4.50%
Capital Required for Capital Adequacy to Risk Weighted Assets	0.0800	0.0800
Leverage Capital Required For Capital Adequacy plus capital conservation buffer To Average Total Assets	4.00%	4.00%
Tier One Risk Based Capital Required For Capital Adequacy plus capital conservation buffer To Average Total Assets	8.50%	8.50%
Common Equity Tier 1 Capital Required For Capital Adequacy plus capital conservation buffer To Average Total Assets	7.00%	7.00%
Capital Required For Capital Adequacy plus capital conservation buffer To Average Total Assets	10.50%	10.50%
Tier One Risk Based Capital Required to be Well Capitalized to Risk Weighted Assets	0.0600	0.0600
Capital Required to be Well Capitalized to Risk Weighted Assets	0.1000	0.1000
Risk Based Capital	$ 1,137,305	$ 877,108
Capital Required for Capital Adequacy	589,619	532,169
Capital Required to be Well Capitalized	737,023	665,211
Tier One Risk Based Capital	878,740	820,312
Tier One Risk Based Capital Required for Capital Adequacy	442,214	399,127
Tier One Risk Based Capital Required to be Well Capitalized	442,214	399,127
Tier One Leverage Capital	878,740	820,312
Tier One Leverage Capital Required for Capital Adequacy	365,143	340,412
Common Equity Tier One Capital	863,740	805,312
Common Equity Tier One Capital Required for Capital Adequacy	$ 331,661	$ 299,345