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Trust Preferred Debentures (Details)
1 Months Ended 12 Months Ended
Jan. 31, 2017
USD ($)
Apr. 10, 2009
USD ($)
Jun. 26, 2003
USD ($)
Sep. 26, 2002
USD ($)
Aug. 31, 2003
USD ($)
Dec. 31, 2017
USD ($)
subsidiary_trust
Debt Instrument [Line Items]            
Number of unconsolidated subsidiary trusts | subsidiary_trust           3
Tompkins Capital Trust I            
Debt Instrument [Line Items]            
Par Amount $ 20,500,000.0          
Redemption price, percentage of liquidation amount 100.00%          
Trust preferred securities liquidation amount, per security $ 1,000 $ 1,000        
Trust preferred securities and debentures maturity   30 years        
Fixed interest rate   7.00%        
Waiting period until redemption (no earlier than) (in years)   5 years        
Sleepy Hollow Capital Trust I            
Debt Instrument [Line Items]            
Par Amount         $ 4,000,000 $ 4,000,000.0
Interest rate, basis spread         3.05%  
Common equity securities issued to the Company         $ 100,000  
Sleepy Hollow Capital Trust I | LIBOR            
Debt Instrument [Line Items]            
Interest rate, basis spread           3.05%
Leesport Capital Trust II            
Debt Instrument [Line Items]            
Par Amount       $ 10,000,000   $ 10,000,000.0
Interest rate, basis spread       3.45%    
Leesport Capital Trust II | LIBOR            
Debt Instrument [Line Items]            
Interest rate, basis spread           3.45%
Madison Statutory Trust I            
Debt Instrument [Line Items]            
Par Amount     $ 5,000,000     $ 5,000,000.0
Interest rate, basis spread     3.10%      
Madison Statutory Trust I | LIBOR            
Debt Instrument [Line Items]            
Interest rate, basis spread           3.10%
Tompkins Capital Trust I | Unconsolidated subsidiary            
Debt Instrument [Line Items]            
Ownership percentage by parent           100.00%
Sleepy Hollow Capital Trust I | Unconsolidated subsidiary            
Debt Instrument [Line Items]            
Ownership percentage by parent           100.00%
Leesport Capital Trust II | Unconsolidated subsidiary            
Debt Instrument [Line Items]            
Ownership percentage by parent           100.00%
Madison Statutory Trust I | Unconsolidated subsidiary            
Debt Instrument [Line Items]            
Ownership percentage by parent           100.00%