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Segment and Related Information - Narrative (Details) - 12 months ended Dec. 31, 2018 | segment | banking_office | subsidiary_bank | subsidiary_trust | office
--- | --- | --- | --- | --- | ---
Segment Reporting Information [Line Items] |  |  |  |  |
Number of reportable business segments | segment | 3 |  |  |  |
Number of subsidiary banks |  | 4 | 3 | 4 |
Ithaca, NY |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Number of banking offices |  | 14 |  |  |
Genesee Valley Region |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Number of banking offices |  | 18 |  |  |
Counties North of New York City |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Number of banking offices |  | 14 |  |  |
Southeastern Pennsylvania |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Number of banking offices |  | 20 |  |  |
Western New York |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Nature of operations, number of offices | office |  |  |  |  | 5

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- Definition Nature Of Operations, Number of Banking Offices + References No definition available. + Details
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- Definition Nature of Operations, Number of Subsidiary Banks + References No definition available. + Details
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- Definition Nature Of Operations, Number of Offices + References No definition available. + 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 No definition available. + Details
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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. + References No definition available. + Details
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- Details
Name: | srt_StatementGeographicalAxis=tmp_TompkinsCayugaCortlandandSchuylerCountiesNewYorkMember
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- Details
Name: | srt_StatementGeographicalAxis=tmp_WyomingLivingstonGenesseeOrleansandMonroeNewYorkMember
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Balance Type: |
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- Details
Name: | srt_StatementGeographicalAxis=tmp_PutnamCountryDutchessCountryandWestchesterNewYorkMember
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- Details
Name: | srt_StatementGeographicalAxis=tmp_BerksMontgomeryPhiladelphiaDelewareandSchuylkillPennsylvaniaMember
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- Details
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