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Goodwill and Other Intangible Assets (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Goodwill [Roll Forward]    
Balance at the beginning of the period $ 91,792 $ 92,243
Acquisitions   1,149
Reduction of goodwill [1] (318) (451)
Balance at the end of the period 92,623 91,792
Reduction of goodwill [1] 318 451
Banking    
Goodwill [Roll Forward]    
Balance at the beginning of the period 64,369 64,369
Acquisitions   0
Reduction of goodwill [1] 0 0
Balance at the end of the period 64,369 64,369
Reduction of goodwill [1] 0 0
Insurance    
Goodwill [Roll Forward]    
Balance at the beginning of the period 19,212 19,663
Acquisitions   1,149
Reduction of goodwill [1] (318) (451)
Balance at the end of the period 20,043 19,212
Reduction of goodwill [1] 318 451
Wealth Management    
Goodwill [Roll Forward]    
Balance at the beginning of the period 8,211 8,211
Acquisitions   0
Reduction of goodwill [1] 0 0
Balance at the end of the period 8,211 8,211
Reduction of goodwill [1] $ 0 $ 0
[1] The $318,000 and $451,000 reduction of goodwill in 2016 and 2015, respectively, reflects an adjustment related to the sale of a portion of insurance revenues. In 2015 and 2016, Tompkins Insurance sold a portion of its personal lines insurance revenues, which had been acquired in a previous acquisition, to a third party.