Fair Value Measurements (Details) - EBP 002 - USD ($)	Dec. 31, 2025	Dec. 31, 2024
EBP, Investment, Fair Value and NAV [Line Items]
Investments, at fair value	$ 149,981,174	$ 128,204,684
Mutual funds
EBP, Investment, Fair Value and NAV [Line Items]
Investments, at fair value	148,087,714	125,872,264
Peoples Bancorp Inc. Common Stock Fund Units
EBP, Investment, Fair Value and NAV [Line Items]
Investments, at fair value	1,893,460	2,332,420
(Level 1)
EBP, Investment, Fair Value and NAV [Line Items]
Investments, at fair value	149,981,174	128,204,684
(Level 1) \| Mutual funds
EBP, Investment, Fair Value and NAV [Line Items]
Investments, at fair value	148,087,714	125,872,264
(Level 1) \| Peoples Bancorp Inc. Common Stock Fund Units
EBP, Investment, Fair Value and NAV [Line Items]
Investments, at fair value	1,893,460	2,332,420
(Level 2)
EBP, Investment, Fair Value and NAV [Line Items]
Investments, at fair value	0	0
(Level 2) \| Mutual funds
EBP, Investment, Fair Value and NAV [Line Items]
Investments, at fair value	0	0
(Level 2) \| Peoples Bancorp Inc. Common Stock Fund Units
EBP, Investment, Fair Value and NAV [Line Items]
Investments, at fair value	0	0
(Level 3)
EBP, Investment, Fair Value and NAV [Line Items]
Investments, at fair value	0	0
(Level 3) \| Mutual funds
EBP, Investment, Fair Value and NAV [Line Items]
Investments, at fair value	0	0
(Level 3) \| Peoples Bancorp Inc. Common Stock Fund Units
EBP, Investment, Fair Value and NAV [Line Items]
Investments, at fair value	$ 0	$ 0

Fair value of investment, excluding plan interest in master trust, held by employee stock purchase, saving, or similar plan (employee benefit plan (EBP)). Includes, but is not limited to, derivative, investment measured at net asset value per share as practical expedient, and insurance contract not meeting fully-benefit responsive investment criteria.

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+ Details

- Definition

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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+ Details