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Segment and Related Information - Narrative (Details)	12 Months Ended
	Dec. 31, 2023 segment	Dec. 31, 2023 banking_Office	Dec. 31, 2023 Segment	Dec. 31, 2023 office
Segment Reporting Information [Line Items]
Number of reportable business segments	3		3
Tompkins Insurance Agencies Inc
Segment Reporting Information [Line Items]
Ownership percentage by parent	100.00%	100.00%	100.00%	100.00%
Ithaca, NY
Segment Reporting Information [Line Items]
Number of banking offices		12
Genesee Valley Region
Segment Reporting Information [Line Items]
Number of banking offices		15
Counties North of New York City
Segment Reporting Information [Line Items]
Number of banking offices		13
Southeastern Pennsylvania
Segment Reporting Information [Line Items]
Number of banking offices		16
Western New York
Segment Reporting Information [Line Items]
Nature of operations, number of offices | office				4

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Nature Of Operations, Number of Banking Offices

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

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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/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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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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