Condensed Parent Company Only Financial Statements - Condensed Statements of Condition (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
ASSETS
Investment in subsidiaries, at equity	$ 1,700	$ 1,700
Total Assets	6,648,290	6,236,756	$ 5,689,995
Liabilities and Shareholders’ Equity
Trust preferred debentures issued to non-consolidated subsidiary	16,691	37,681
Other liabilities	70,671	70,654
Tompkins Financial Corporation Shareholders’ Equity	574,780	547,953
Total Liabilities and Equity	6,648,290	6,236,756
Tompkins (the Parent Company)
ASSETS
Cash	3,326	28,398
Investment in subsidiaries, at equity	586,976	563,691
Other	10,686	10,345
Total Assets	600,988	602,434
Liabilities and Shareholders’ Equity
Borrowings	9,000	16,000
Trust preferred debentures issued to non-consolidated subsidiary	16,691	37,681
Other liabilities	517	800
Tompkins Financial Corporation Shareholders’ Equity	574,780	547,953
Total Liabilities and Equity	$ 600,988	$ 602,434