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Trust Preferred Debentures (Details)			12 Months Ended
	Jan. 31, 2017 USD ($)	Apr. 10, 2009	Dec. 31, 2016 USD ($) subsidiary_trust $ / shares
Number of unconsolidated subsidiary trusts | subsidiary_trust			4
Madison Statutory Trust I
Issuance Date			Jun. 26, 2003
Par Amount			$ 5,000,000
Interest rate, basis spread			3.10%
Interest rate, variable rate			3-month LIBOR
Maturity Date			Jun. 26, 2033
Leesport Capital Trust II
Issuance Date			Sep. 26, 2002
Par Amount			$ 10,000,000
Interest rate, basis spread			3.45%
Interest rate, variable rate			3-month LIBOR
Maturity Date			Sep. 26, 2032
Sleepy Hollow Capital Trust I
Issuance Date			Aug. 30, 2003
Par Amount			$ 4,000,000
Interest rate, basis spread			3.05%
Interest rate, variable rate			3-month LIBOR
Maturity Date			Aug. 30, 2033
Common equity securities issued to the Company			$ 100,000
Tompkins Capital Trust I
Issuance Date			Apr. 10, 2009
Par Amount			$ 20,500,000
Interest Rate			7.00%
Maturity Date			Apr. 10, 2039
Capital contribution to trust			$ 636,000
Debt Instrument, Term		30 years
Trust preferred securities liquidation amount, per security			$ 1,000
Waiting period until redemption (no earlier than) (in years)		5 years
Conversion price (USD per share) | $ / shares			$ 41.35
Tompkins Capital Trust I | Unconsolidated subsidiary
Ownership percentage by parent			100.00%
Sleepy Hollow Capital Trust I | Unconsolidated subsidiary
Ownership percentage by parent			100.00%
Leesport Capital Trust II | Unconsolidated subsidiary
Ownership percentage by parent			100.00%
Madison Statutory Trust I | Unconsolidated subsidiary
Ownership percentage by parent			100.00%
Subsequent Event | Tompkins Capital Trust I
Trust preferred securities liquidation amount, per security	$ 1,000
Redemption price, percentage of liquidation amount	100.00%

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- Definition

The amount of contributed capital (in cash) to the trust, that was used to acquired Subordinated Debentures.

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The value of common equity securities issued to the Company from the trust. Proceeds of these offerings were used to acquire Subordinated Debentures currently held in trust.

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Nature of Operations, Number of Unconsolidated Subsidiary Trusts

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Preferred Stock, Redemption Price, Percentage Of Liquidation Amount

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- Definition

Percentage points added to the reference rate to compute the variable rate on the debt instrument.

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- Definition

The price per share of the conversion feature embedded in the debt instrument.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 470
-SubTopic 20
-Section 50
-Paragraph 5
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=6928298&loc=SL6031898-161870

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- Definition

The reference rate for the variable rate of the debt instrument, such as LIBOR or the US Treasury rate and the maturity of the reference rate used, such as three months or six months LIBOR.

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- Definition

Effective interest rate for the funds borrowed under the debt agreement considering interest compounding and original issue discount or premium.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.22(a)(1))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 45
-Paragraph 2
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Date the debt instrument was issued, in CCYY-MM-DD format.

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-Name Accounting Standards Codification
-Topic 210
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- Definition

Date when the debt instrument is scheduled to be fully repaid, in CCYY-MM-DD format.

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-Name Accounting Standards Codification
-Topic 210
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-Paragraph 1
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-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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Period of time between issuance and maturity of debt instrument, in PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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- Definition

Including the current and noncurrent portions, the carrying value of junior subordinated long-term debt owed to unconsolidated subsidiary trusts as of the balance sheet date. Such debt places a lender in a lien position behind debt having a higher priority of repayment in liquidation of the entity's assets and was initially scheduled to be repaid after one year or beyond the normal operating cycle if longer.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03.16)
-URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910

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

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Value of the difference between preference in liquidation and the par or stated values of the preferred shares.

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