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Goodwill and Intangible Assets (Details Textual) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Dec. 31, 2016
Goodwill And Intangible Assets Disclosure [Abstract]          
Goodwill associated with the Company's purchase of National Associates, Inc. and Farmers Trust Company $ 37,164   $ 37,164   $ 37,164
Aggregate amortization expense $ 364 $ 335 $ 729 $ 672