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Segment and Related Information - Narrative (Details)	3 Months Ended
	Mar. 31, 2019 office banking_office segment subsidiary_trust
Segment Reporting Information [Line Items]
Number of reportable segments | segment	3
Nature of operations, number of subsidiary banks | subsidiary_trust	4
Tompkins, Cayuga, Cortland and Schuyler Counties, New York
Segment Reporting Information [Line Items]
Nature of operations, number of banking offices	14
Wyoming, Livingston, Genessee, Orleans and Monroe, New York
Segment Reporting Information [Line Items]
Nature of operations, number of banking offices	18
Western New York
Segment Reporting Information [Line Items]
Number of offices | office	5
Putnam Country, Dutchess Country and Westchester, New York
Segment Reporting Information [Line Items]
Nature of operations, number of banking offices	14
Berks, Montgomery, Philadelphia, Deleware and Schuylkill, Pennsylvania
Segment Reporting Information [Line Items]
Nature of operations, number of banking offices	20
Tompkins Insurance Agencies Inc
Segment Reporting Information [Line Items]
Noncontrolling interest, ownership percentage by parent	100.00%

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- Definition

Nature Of Operations, Number of Banking Offices

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Nature of Operations, Number of Subsidiary Banks

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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.

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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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