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Capital Ratios - Capital Ratios for Park and Each Subsidiary (Details) - USD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
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Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items] |  |  |
Capital Conservation Buffer | 1.875% | 1.25% |
Park National Bank |  |  |
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items] |  |  |
Tier 1 Risk-Based Capital | 11.01% | 10.35% |
Tier One Risk Based Capital Required for Capital Adequacy | $ 345,970 | $ 325,054 |
Common Equity Tier 1 | 11.01% | 10.35% |
Common Equity Tier One Capital Required for Capital Adequacy | $ 259,478 | $ 243,791 |
Total Risk-Based | 12.30% | 11.60% |
Capital Required for Capital Adequacy | $ 461,293 | $ 433,406 |
Leverage Capital Required For Capital Adequacy To Average Total Assets | 4.00% | 4.00% |
Tier One Risk Based Capital Required for Capital Adequacy to Risk Weighted Assets | 6.00% | 6.00% |
Tier One Risk Based Capital Required to be Well Capitalized | $ 461,293 | $ 433,406 |
Common Equity Tier 1 Capital Required For Capital Adequacy To Average Total Assets | 4.50% | 4.50% |
Common Equity Tier One Capital Required to be Well-Capitalized | $ 374,801 | $ 352,142 |
Leverage | 8.29% | 7.36% |
Tier One Leverage Capital Required for Capital Adequacy | $ 306,485 | $ 304,722 |
Capital Required for Capital Adequacy to Risk Weighted Assets | 8.00% | 8.00% |
Capital Required to be Well Capitalized | $ 576,617 | $ 541,757 |
Tier One Risk Based Capital | $ 634,909 | $ 560,530 |
Common Equity Tier 1 Capital Required To Be Well Capitalized To Average Total Assets | 6.50% | 6.50% |
Common Equity Tier One Capital | $ 634,909 | $ 560,530 |
Risk Based Capital | $ 709,101 | $ 628,440 |
Leverage Capital Required To Be Well Capitalized To Average Total Assets | 5.00% | 5.00% |
Tier One Risk Based Capital Required to be Well Capitalized to Risk Weighted Assets | 8.00% | 8.00% |
Capital Required to be Well Capitalized to Risk Weighted Assets | 10.00% | 10.00% |
Tier One Leverage Capital | $ 634,909 | $ 560,530 |
Tier One Leverage Capital Required to be Well Capitalized | $ 383,106 | $ 380,903 |
Park |  |  |
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items] |  |  |
Tier 1 Risk-Based Capital | 13.30% | 13.22% |
Tier One Risk Based Capital Required for Capital Adequacy | $ 349,299 | $ 329,235 |
Common Equity Tier 1 | 13.04% | 12.94% |
Common Equity Tier One Capital Required for Capital Adequacy | $ 261,975 | $ 246,927 |
Total Risk-Based | 14.19% | 14.14% |
Capital Required for Capital Adequacy | $ 465,732 | $ 438,981 |
Leverage Capital Required For Capital Adequacy To Average Total Assets | 4.00% | 4.00% |
Tier One Risk Based Capital Required for Capital Adequacy to Risk Weighted Assets | 6.00% | 6.00% |
Tier One Risk Based Capital Required to be Well Capitalized | $ 349,299 | $ 329,235 |
Common Equity Tier 1 Capital Required For Capital Adequacy To Average Total Assets | 4.50% | 4.50% |
Leverage | 10.04% | 9.44% |
Tier One Leverage Capital Required for Capital Adequacy | $ 308,397 | $ 307,441 |
Capital Required for Capital Adequacy to Risk Weighted Assets | 8.00% | 8.00% |
Capital Required to be Well Capitalized | $ 582,166 | $ 548,726 |
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 | $ 774,369 | $ 725,221 |
Common Equity Tier One Capital | 759,369 | 710,221 |
Risk Based Capital | $ 826,006 | $ 775,867 |
Tier One Risk Based Capital Required to be Well Capitalized to Risk Weighted Assets | 6.00% | 6.00% |
Capital Required to be Well Capitalized to Risk Weighted Assets | 10.00% | 10.00% |
Tier One Leverage Capital | $ 774,369 | $ 725,221 |
Minimum |  |  |
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items] |  |  |
Capital Conservation Buffer |  |  | 0.625%
Maximum |  |  |
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items] |  |  |
Capital Conservation Buffer | 2.50% |  |

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