Regulatory Matters - Summary of Compliance with Regulatory Capital Requirements under Banking Regulations (Details)	Dec. 31, 2024 USD ($)	Dec. 31, 2023 USD ($)
PEOPLES BANCORP, INC.
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Common equity tier one capital	$ 833,128,000	$ 766,692,000
Common equity tier one capital ratio	0.1195	0.1156
Common equity tier one capital required for capital adequacy	$ 313,717,000	$ 298,393,000
Common equity tier 1 risk based capital required for capital adequacy to risk weighted assets	4.50%	4.50%
Common equity tier one capital required to be well-capitalized	$ 453,147,000	$ 431,011,000
Common equity tier 1 risk based capital required to be well capitalized to risk weighted assets	6.50%	6.50%
Tier one risk based capital	$ 863,974,000	$ 820,496,000
Tier one risk based capital to risk weighted assets	0.1239	0.1237
Tier one risk based capital required for capital adequacy	$ 418,289,000	$ 397,857,000
Tier one risk based capital required for capital adequacy to risk weighted assets	0.0600	0.0600
Tier one risk based capital required to be well capitalized	$ 557,719,000	$ 530,476,000
Tier one risk based capital required to be well capitalized to risk weighted assets	0.0800	0.0800
Capital	$ 946,724,000	$ 873,226,000
Capital to risk ratio	0.1358	0.1317
Capital required for capital adequacy	$ 557,719,000	$ 530,476,000
Capital required for capital adequacy to risk ratio	0.0800	0.0800
Capital required to be well capitalized	$ 697,149,000	$ 663,095,000
Capital required to be well capitalized to risk ratio	0.1000	0.1000
Tier one leverage capital	$ 863,974,000	$ 820,496,000
Tier one leverage capital to ratio	0.0973	0.0948
Tier one leverage capital required for capital adequacy	$ 355,219,000	$ 346,112,000
Tier one leverage capital required for capital adequacy to average assets ratio	0.0400	0.0400
Tier one leverage capital required to be well capitalized	$ 444,024,000	$ 432,640,000
Tier one leverage capital required to be well capitalized to average assets ratio	0.0500	0.0500
Regulatory capital conservation buffer	$ 389,005,000	$ 342,750,000
Regulatory capital conservation buffer ratio	0.0560	0.0517
Risk weighted assets	6,971,489,000	6,630,945,000
PEOPLES BANK
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Common equity tier one capital	$ 840,443,000	$ 783,790,000
Common equity tier one capital ratio	0.1207	0.1185
Common equity tier one capital required for capital adequacy	$ 313,212,000	$ 297,638,000
Common equity tier 1 risk based capital required for capital adequacy to risk weighted assets	4.50%	4.50%
Common equity tier one capital required to be well-capitalized	$ 452,418,000	$ 429,921,000
Common equity tier 1 risk based capital required to be well capitalized to risk weighted assets	6.50%	6.50%
Tier one risk based capital	$ 840,443,000	$ 783,790,000
Tier one risk based capital to risk weighted assets	0.1207	0.1185
Tier one risk based capital required for capital adequacy	$ 417,617,000	$ 396,850,000
Tier one risk based capital required for capital adequacy to risk weighted assets	0.0600	0.0600
Tier one risk based capital required to be well capitalized	$ 556,822,000	$ 529,134,000
Tier one risk based capital required to be well capitalized to risk weighted assets	0.0800	0.0800
Capital	$ 903,969,000	$ 836,520,000
Capital to risk ratio	0.1299	0.1265
Capital required for capital adequacy	$ 556,822,000	$ 529,134,000
Capital required for capital adequacy to risk ratio	0.0800	0.0800
Capital required to be well capitalized	$ 696,028,000	$ 661,417,000
Capital required to be well capitalized to risk ratio	0.1000	0.1000
Tier one leverage capital	$ 840,443,000	$ 783,790,000
Tier one leverage capital to ratio	0.0948	0.0912
Tier one leverage capital required for capital adequacy	$ 354,499,000	$ 343,613,000
Tier one leverage capital required for capital adequacy to average assets ratio	0.0400	0.0400
Tier one leverage capital required to be well capitalized	$ 443,123,000	$ 429,517,000
Tier one leverage capital required to be well capitalized to average assets ratio	0.0500	0.0500
Regulatory capital conservation buffer	$ 347,147,000	$ 307,386,000
Regulatory capital conservation buffer ratio	0.0500	0.0465
Risk weighted assets	6,960,276,000	6,614,172,000
Minimum \| PEOPLES BANCORP, INC.
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Regulatory capital conservation buffer	174,287,000	165,774,000
Regulatory capital conservation buffer ratio	0.0250	0.0250
Minimum \| PEOPLES BANK
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Regulatory capital conservation buffer	174,007,000	165,354,000
Regulatory capital conservation buffer ratio	$ 0.0250	$ 0.0250

Common Equity Tier 1 Risk Based Capital Required for Capital Adequacy to Risk Weighted Assets

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Regulatory Capital Conservation Buffer

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Amount of total capital as defined by regulatory framework.

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Amount of minimum total risk-based capital required for capital adequacy as defined by regulatory framework.

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 942
-SubTopic 505
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
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-Publisher FASB
-URI https://asc.fasb.org/1943274/2147477270/942-505-50-1

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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