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Regulations and Supervision (Details) - USD ($) | Jan. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
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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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