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Segment and Related Information - Narrative (Details) | 9 Months Ended
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Sep. 30, 2018 subsidiary office banking_office segment
Segment Reporting Information [Line Items] |
Number of reportable segments | segment | 3
Nature of operations, number of unconsolidated subsidiary trusts | subsidiary | 4
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
Tompkins Insurance Agencies Inc [Member] |
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 + References No definition available. + Details
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Namespace Prefix: | tmp_
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Balance Type: | na
Period Type: | duration

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- Definition Nature of Operations, Number of Unconsolidated Subsidiaries + References No definition available. + Details
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Namespace Prefix: | tmp_
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Period Type: | duration

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- Definition Nature Of Operations, Number of Offices + References No definition available. + Details
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Namespace Prefix: | tmp_
Data Type: | xbrli:integerItemType
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- Definition The parent entity's interest in net assets of the subsidiary, expressed as a percentage. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
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Balance Type: | na
Period Type: | instant

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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_IthacaNYMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | srt_StatementGeographicalAxis=tmp_GeneseeValleyRegionNewYorkStateMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | srt_StatementGeographicalAxis=tmp_CountiesNorthofNewYorkCityMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | srt_StatementGeographicalAxis=tmp_SoutheasternPennsylvaniaMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | srt_StatementGeographicalAxis=tmp_WesternNewYorkMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | srt_StatementGeographicalAxis=tmp_MontgomeryCountyPennsylvaniaMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
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Balance Type: |
Period Type: |