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Regulations and Supervision (Details) - USD ($)	Jan. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
The Company (consolidated)
Total Capital (to risk-weighted assets)
Total Capital (to risk-weighted assets), Actual Amount		$ 540,109,000	$ 520,891,000
Total Capital (to risk-weighted assets), Actual Ratio		12.20%	13.00%
Total Capital (to risk-weighted assets), Required to be Adequately Capitalized, Amount		$ 353,520,000	$ 319,711,000
Total Capital (to risk-weighted assets), Required to be Adequately Capitalized, Ratio		8.00%	8.00%
Total Capital (to risk-weighted assets), Required to be Well Capitalized, Amount		$ 441,900,000	$ 399,638,000
Total Capital (to risk-weighted assets), Required to be Well Capitalized, Ratio		10.00%	10.00%
Common EquityTier 1 Capital (to risk-weighted assets)
Common EquityTier 1 Capital (to risk-weighted assets), Actual Amount		$ 486,006,000	$ 449,535,000
Common EquityTier 1 Capital (to risk-weighted assets), Actual Ratio		11.00%	11.30%
Common EquityTier 1 Capital (to risk-weighted assets), Required to be Adequately Capitalized, Amount		$ 198,855,000	$ 179,837,000
Common EquityTier 1 Capital (to risk-weighted assets), Required to be Adequately Capitalized, Ratio		4.50%	4.50%
Common EquityTier 1 Capital (to risk-weighted assets), Required to be Well Capitalized, Amount		$ 287,235,000	$ 259,765,000
Common EquityTier 1 Capital (to risk-weighted assets), Required to be Well Capitalized, Ratio		6.50%	6.50%
Tier 1 Capital (to risk-weighted assets)
Tier 1 Capital (to risk-weighted assets), Actual Amount		$ 502,525,000	$ 487,043,000
Tier 1 Capital (to risk-weighted assets), Actual Ratio		11.40%	12.20%
Tier 1 Capital (to risk-weighted assets), Required to be Adequately Capitalized, Amount		$ 265,140,000	$ 239,783,000
Tier 1 Capital (to risk-weighted assets), Required to be Adequately Capitalized, Ratio		6.00%	6.00%
Tier 1 Capital (to risk-weighted assets), Required to be Well Capitalized, Amount		$ 353,520,000	$ 319,711,000
Tier 1 Capital (to risk-weighted assets), Required to be Well Capitalized, Ratio		8.00%	8.00%
Tier 1 Capital (to average assets)
Tier 1 Capital (to average assets), Actual Amount		$ 502,525,000	$ 487,043,000
Tier 1 Capital (to average assets), Actual Ratio		8.40%	8.80%
Tier 1 Capital (to average assets), Required to be Adequately Capitalized, Amount		$ 238,872,000	$ 220,995,000
Tier 1 Capital (to average assets), Required to be Adequately Capitalized, Ratio		4.00%	4.00%
Tier 1 Capital (to average assets), Required to be Well Capitalized, Amount		$ 298,590,000	$ 276,243,000
Tier 1 Capital (to average assets), Required to be Well Capitalized, Ratio		5.00%	5.00%
Trust Company
Total Capital (to risk-weighted assets)
Total Capital (to risk-weighted assets), Actual Amount		$ 154,062,000	$ 151,299,000
Total Capital (to risk-weighted assets), Actual Ratio		12.30%	13.70%
Total Capital (to risk-weighted assets), Required to be Adequately Capitalized, Amount		$ 99,880,000	$ 88,274,000
Total Capital (to risk-weighted assets), Required to be Adequately Capitalized, Ratio		8.00%	8.00%
Total Capital (to risk-weighted assets), Required to be Well Capitalized, Amount		$ 124,850,000	$ 110,342,000
Total Capital (to risk-weighted assets), Required to be Well Capitalized, Ratio		10.00%	10.00%
Common EquityTier 1 Capital (to risk-weighted assets)
Common EquityTier 1 Capital (to risk-weighted assets), Actual Amount		$ 144,672,000	$ 143,005,000
Common EquityTier 1 Capital (to risk-weighted assets), Actual Ratio		11.60%	13.00%
Common EquityTier 1 Capital (to risk-weighted assets), Required to be Adequately Capitalized, Amount		$ 56,182,000	$ 49,654,000
Common EquityTier 1 Capital (to risk-weighted assets), Required to be Adequately Capitalized, Ratio		4.50%	4.50%
Common EquityTier 1 Capital (to risk-weighted assets), Required to be Well Capitalized, Amount		$ 81,152,000	$ 71,722,000
Common EquityTier 1 Capital (to risk-weighted assets), Required to be Well Capitalized, Ratio		6.50%	6.50%
Tier 1 Capital (to risk-weighted assets)
Tier 1 Capital (to risk-weighted assets), Actual Amount		$ 144,672,000	$ 143,005,000
Tier 1 Capital (to risk-weighted assets), Actual Ratio		11.60%	13.00%
Tier 1 Capital (to risk-weighted assets), Required to be Adequately Capitalized, Amount		$ 74,910,000	$ 66,205,000
Tier 1 Capital (to risk-weighted assets), Required to be Adequately Capitalized, Ratio		6.00%	6.00%
Tier 1 Capital (to risk-weighted assets), Required to be Well Capitalized, Amount		$ 99,880,000	$ 88,274,000
Tier 1 Capital (to risk-weighted assets), Required to be Well Capitalized, Ratio		8.00%	8.00%
Tier 1 Capital (to average assets)
Tier 1 Capital (to average assets), Actual Amount		$ 144,672,000	$ 143,005,000
Tier 1 Capital (to average assets), Actual Ratio		7.70%	8.00%
Tier 1 Capital (to average assets), Required to be Adequately Capitalized, Amount		$ 75,246,000	$ 71,319,000
Tier 1 Capital (to average assets), Required to be Adequately Capitalized, Ratio		4.00%	4.00%
Tier 1 Capital (to average assets), Required to be Well Capitalized, Amount		$ 94,057,000	$ 89,148,000
Tier 1 Capital (to average assets), Required to be Well Capitalized, Ratio		5.00%	5.00%
Castile
Total Capital (to risk-weighted assets)
Total Capital (to risk-weighted assets), Actual Amount		$ 114,282,000	$ 104,568,000
Total Capital (to risk-weighted assets), Actual Ratio		10.70%	10.50%
Total Capital (to risk-weighted assets), Required to be Adequately Capitalized, Amount		$ 85,699,000	$ 79,657,000
Total Capital (to risk-weighted assets), Required to be Adequately Capitalized, Ratio		8.00%	8.00%
Total Capital (to risk-weighted assets), Required to be Well Capitalized, Amount		$ 107,124,000	$ 99,571,000
Total Capital (to risk-weighted assets), Required to be Well Capitalized, Ratio		10.00%	10.00%
Common EquityTier 1 Capital (to risk-weighted assets)
Common EquityTier 1 Capital (to risk-weighted assets), Actual Amount		$ 105,998,000	$ 97,097,000
Common EquityTier 1 Capital (to risk-weighted assets), Actual Ratio		9.90%	9.80%
Common EquityTier 1 Capital (to risk-weighted assets), Required to be Adequately Capitalized, Amount		$ 48,206,000	$ 44,807,000
Common EquityTier 1 Capital (to risk-weighted assets), Required to be Adequately Capitalized, Ratio		4.50%	4.50%
Common EquityTier 1 Capital (to risk-weighted assets), Required to be Well Capitalized, Amount		$ 69,630,000	$ 64,721,000
Common EquityTier 1 Capital (to risk-weighted assets), Required to be Well Capitalized, Ratio		6.50%	6.50%
Tier 1 Capital (to risk-weighted assets)
Tier 1 Capital (to risk-weighted assets), Actual Amount		$ 105,998,000	$ 97,097,000
Tier 1 Capital (to risk-weighted assets), Actual Ratio		9.90%	9.80%
Tier 1 Capital (to risk-weighted assets), Required to be Adequately Capitalized, Amount		$ 64,274,000	$ 59,743,000
Tier 1 Capital (to risk-weighted assets), Required to be Adequately Capitalized, Ratio		6.00%	6.00%
Tier 1 Capital (to risk-weighted assets), Required to be Well Capitalized, Amount		$ 85,699,000	$ 79,657,000
Tier 1 Capital (to risk-weighted assets), Required to be Well Capitalized, Ratio		8.00%	8.00%
Tier 1 Capital (to average assets)
Tier 1 Capital (to average assets), Actual Amount		$ 105,998,000	$ 97,097,000
Tier 1 Capital (to average assets), Actual Ratio		7.70%	7.70%
Tier 1 Capital (to average assets), Required to be Adequately Capitalized, Amount		$ 54,851,000	$ 50,309,000
Tier 1 Capital (to average assets), Required to be Adequately Capitalized, Ratio		4.00%	4.00%
Tier 1 Capital (to average assets), Required to be Well Capitalized, Amount		$ 68,563,000	$ 62,887,000
Tier 1 Capital (to average assets), Required to be Well Capitalized, Ratio		5.00%	5.00%
Mahopac
Total Capital (to risk-weighted assets)
Total Capital (to risk-weighted assets), Actual Amount		$ 111,727,000	$ 110,158,000
Total Capital (to risk-weighted assets), Actual Ratio		12.60%	14.00%
Total Capital (to risk-weighted assets), Required to be Adequately Capitalized, Amount		$ 70,824,000	$ 62,943,000
Total Capital (to risk-weighted assets), Required to be Adequately Capitalized, Ratio		8.00%	8.00%
Total Capital (to risk-weighted assets), Required to be Well Capitalized, Amount		$ 88,530,000	$ 78,678,000
Total Capital (to risk-weighted assets), Required to be Well Capitalized, Ratio		10.00%	10.00%
Common EquityTier 1 Capital (to risk-weighted assets)
Common EquityTier 1 Capital (to risk-weighted assets), Actual Amount		$ 100,956,000	$ 100,322,000
Common EquityTier 1 Capital (to risk-weighted assets), Actual Ratio		11.40%	12.80%
Common EquityTier 1 Capital (to risk-weighted assets), Required to be Adequately Capitalized, Amount		$ 39,838,000	$ 35,405,000
Common EquityTier 1 Capital (to risk-weighted assets), Required to be Adequately Capitalized, Ratio		4.50%	4.50%
Common EquityTier 1 Capital (to risk-weighted assets), Required to be Well Capitalized, Amount		$ 57,544,000	$ 51,141,000
Common EquityTier 1 Capital (to risk-weighted assets), Required to be Well Capitalized, Ratio		6.50%	6.50%
Tier 1 Capital (to risk-weighted assets)
Tier 1 Capital (to risk-weighted assets), Actual Amount		$ 100,956,000	$ 100,322,000
Tier 1 Capital (to risk-weighted assets), Actual Ratio		11.40%	12.80%
Tier 1 Capital (to risk-weighted assets), Required to be Adequately Capitalized, Amount		$ 53,118,000	$ 47,207,000
Tier 1 Capital (to risk-weighted assets), Required to be Adequately Capitalized, Ratio		6.00%	6.00%
Tier 1 Capital (to risk-weighted assets), Required to be Well Capitalized, Amount		$ 70,824,000	$ 62,943,000
Tier 1 Capital (to risk-weighted assets), Required to be Well Capitalized, Ratio		8.00%	8.00%
Tier 1 Capital (to average assets)
Tier 1 Capital (to average assets), Actual Amount		$ 100,956,000	$ 100,322,000
Tier 1 Capital (to average assets), Actual Ratio		8.40%	9.20%
Tier 1 Capital (to average assets), Required to be Adequately Capitalized, Amount		$ 48,333,000	$ 43,865,000
Tier 1 Capital (to average assets), Required to be Adequately Capitalized, Ratio		4.00%	4.00%
Tier 1 Capital (to average assets), Required to be Well Capitalized, Amount		$ 60,416,000	$ 54,831,000
Tier 1 Capital (to average assets), Required to be Well Capitalized, Ratio		5.00%	5.00%
VIST
Total Capital (to risk-weighted assets)
Total Capital (to risk-weighted assets), Actual Amount		$ 141,193,000	$ 133,925,000
Total Capital (to risk-weighted assets), Actual Ratio		11.90%	12.40%
Total Capital (to risk-weighted assets), Required to be Adequately Capitalized, Amount		$ 95,116,000	$ 86,371,000
Total Capital (to risk-weighted assets), Required to be Adequately Capitalized, Ratio		8.00%	8.00%
Total Capital (to risk-weighted assets), Required to be Well Capitalized, Amount		$ 118,895,000	$ 107,964,000
Total Capital (to risk-weighted assets), Required to be Well Capitalized, Ratio		10.00%	10.00%
Common EquityTier 1 Capital (to risk-weighted assets)
Common EquityTier 1 Capital (to risk-weighted assets), Actual Amount		$ 133,505,000	$ 127,229,000
Common EquityTier 1 Capital (to risk-weighted assets), Actual Ratio		11.20%	11.80%
Common EquityTier 1 Capital (to risk-weighted assets), Required to be Adequately Capitalized, Amount		$ 53,503,000	$ 48,584,000
Common EquityTier 1 Capital (to risk-weighted assets), Required to be Adequately Capitalized, Ratio		4.50%	4.50%
Common EquityTier 1 Capital (to risk-weighted assets), Required to be Well Capitalized, Amount		$ 77,282,000	$ 70,177,000
Common EquityTier 1 Capital (to risk-weighted assets), Required to be Well Capitalized, Ratio		6.50%	6.50%
Tier 1 Capital (to risk-weighted assets)
Tier 1 Capital (to risk-weighted assets), Actual Amount		$ 133,505,000	$ 127,229,000
Tier 1 Capital (to risk-weighted assets), Actual Ratio		11.20%	11.80%
Tier 1 Capital (to risk-weighted assets), Required to be Adequately Capitalized, Amount		$ 71,337,000	$ 64,779,000
Tier 1 Capital (to risk-weighted assets), Required to be Adequately Capitalized, Ratio		6.00%	6.00%
Tier 1 Capital (to risk-weighted assets), Required to be Well Capitalized, Amount		$ 95,116,000	$ 86,371,000
Tier 1 Capital (to risk-weighted assets), Required to be Well Capitalized, Ratio		8.00%	8.00%
Tier 1 Capital (to average assets)
Tier 1 Capital (to average assets), Actual Amount		$ 133,505,000	$ 127,229,000
Tier 1 Capital (to average assets), Actual Ratio		8.90%	9.10%
Tier 1 Capital (to average assets), Required to be Adequately Capitalized, Amount		$ 59,984,000	$ 55,650,000
Tier 1 Capital (to average assets), Required to be Adequately Capitalized, Ratio		4.00%	4.00%
Tier 1 Capital (to average assets), Required to be Well Capitalized, Amount		$ 74,980,000	$ 69,563,000
Tier 1 Capital (to average assets), Required to be Well Capitalized, Ratio		5.00%	5.00%
Tompkins Capital Trust I
Trust preferred securities liquidation amount, per security		$ 1,000
Tompkins Capital Trust I | Subsequent Event
Stock redeemed or called during period, value	$ 20,500,000
Redemption price, percentage of liquidation amount	100.00%
Trust preferred securities liquidation amount, per security	$ 1,000

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Common Equity Tier 1 capital divided by risk weighted assets as defined by regulations.

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Preferred Stock, Redemption Price, Percentage Of Liquidation Amount

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The amount of total capital as defined in the regulations.

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The minimum Total risk based capital ratio (total capital divided by risk weighted assets) required for capital adequacy purposes under the regulatory framework for prompt corrective action.

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The amount of Total Capital required to be categorized as well as capitalized under the regulatory framework for prompt corrective action.

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Total Capital divided by risk weighted assets as defined in the regulations.

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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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Equity impact of the value of stock bought back by the entity at the exercise price or redemption price.

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Tier 1 Leverage Capital as defined in the regulations. Also called Core Capital.

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The minimum amount of Tier 1 Leverage Capital required for capital adequacy purposes under the regulatory framework for prompt corrective action.

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