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Acquisitions (Details)
$ in Thousands
 12 Months Ended
Mar. 08, 2013
USD ($)
Dec. 31, 2015
USD ($)
Branch
Dec. 31, 2014
USD ($)
Business Acquisition [Line Items]      
Goodwill acquired   $ 2,323  
Alliance Financial Corporation [Member]      
Business Acquisition [Line Items]      
Date of acquisition   Mar. 08, 2013  
Total consideration paid $ 226,000    
Number of banking centers operated by acquiree | Branch   26  
Other goodwill adjustments [Abstract]      
Deferred tax adjustments     $ (1,000)
Valuation adjustments     (400)
Decrease in goodwill     $ (1,400)
Third Party Administrators, Inc. [Member]      
Business Acquisition [Line Items]      
Total consideration paid   $ 4,100  
Goodwill acquired   $ 2,300