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Segment and Related Information - Narrative (Details)	3 Months Ended
	Mar. 31, 2025 office banking_office segment
Segment Reporting Information [Line Items]
Number of reportable segments | segment	3
Tompkins Insurance Agencies, Inc.
Segment Reporting Information [Line Items]
Noncontrolling interest, ownership percentage by parent	100.00%
Tompkins, Cayuga, Cortland and Schuyler Counties, New York
Segment Reporting Information [Line Items]
Nature of operations, number of banking offices	12
Wyoming, Livingston, Genessee, Orleans and Monroe, New York
Segment Reporting Information [Line Items]
Nature of operations, number of banking offices	14
Putnam Country, Dutchess Country and Westchester, New York
Segment Reporting Information [Line Items]
Nature of operations, number of banking offices	12
Berks, Montgomery, Philadelphia, Deleware and Schuylkill, Pennsylvania
Segment Reporting Information [Line Items]
Nature of operations, number of banking offices	16
Western New York
Segment Reporting Information [Line Items]
Number of offices | office	4

X

- Definition

Nature Of Operations, Number of Banking Offices

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- Definition

The parent entity's interest in net assets of the subsidiary, expressed as a percentage.

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- Definition

Number of segments reported by the entity. A reportable segment is a component of an entity for which there is an accounting requirement to report separate financial information on that component in the entity's financial statements.

+ References

Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Topic 280
-SubTopic 10
-Name Accounting Standards Codification
-Section 55
-Paragraph 47
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482785/280-10-55-47

Reference 2: http://www.xbrl.org/2003/role/exampleRef
-Topic 280
-SubTopic 10
-Name Accounting Standards Codification
-Section 55
-Paragraph 54
-Subparagraph (e)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482785/280-10-55-54

Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 280
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 18
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482810/280-10-50-18

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- 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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