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Segment and Related Information - Narrative (Details)	6 Months Ended
	Jun. 30, 2018 office subsidiary_trust banking_office segment
Segment Reporting Information [Line Items]
Number of reportable segments | segment	3
Nature of operations, number of unconsolidated subsidiary trusts | subsidiary_trust	4
Tompkins Insurance Agencies Inc
Segment Reporting Information [Line Items]
Noncontrolling interest, ownership percentage by parent	100.00%
Ithaca, NY
Segment Reporting Information [Line Items]
Nature of operations, number of banking offices	14
Genesee Valley Region, New York State
Segment Reporting Information [Line Items]
Nature of operations, number of banking offices	17
Counties North of New York City
Segment Reporting Information [Line Items]
Nature of operations, number of banking offices	14
Southeastern Pennsylvania
Segment Reporting Information [Line Items]
Nature of operations, number of banking offices	21
Western New York
Segment Reporting Information [Line Items]
Number of offices | office	5
Tompkins County, New York
Segment Reporting Information [Line Items]
Number of offices | office	1
Montgomery County, Pennsylvania
Segment Reporting Information [Line Items]
Number of offices | office	1

X

- Definition

Nature Of Operations, Number of Banking Offices

+ References

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+ Details

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- Definition

Nature of Operations, Number of Unconsolidated Subsidiary Trusts

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- Definition

Nature Of Operations, Number of Offices

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- Definition

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

+ References

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+ Details

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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

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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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No definition available.

+ Details

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- Details

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- Details

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- Details

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- Details

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- Details

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