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Goodwill and Intangible Assets (Details Textual) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Goodwill And Intangible Assets [Line Items]      
Goodwill associated with the Company's purchase of National Associates, Inc. and Farmers Trust Company $ 37,164 $ 35,090  
Impairment charges     $ 763
Other intangibles 7,990 7,821  
Aggregate amortization expense 1,461 $ 983 $ 767
Core Deposits      
Goodwill And Intangible Assets [Line Items]      
Other intangibles $ 5,600