Acquisition of The Scottdale Bank and Trust Company (Pro Forma Information) (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Business Acquisition [Line Items]
Net interest income after loan loss provision	$ 15,811	$ 9,516	$ 37,978	$ 27,876
Noninterest income	2,165	1,564	5,371	4,362
Noninterest expense	15,264	7,960	36,189	23,320
Scottdale Bank and Trust Company [Member]
Business Acquisition [Line Items]
Net interest income after loan loss provision	15,811	11,074	37,978	32,455
Noninterest income	2,165	1,658	5,371	4,729
Noninterest expense	15,232	9,411	34,895	28,759
Net income	$ 2,196	$ 2,424	$ 7,109	$ 6,150
Net income per common share	$ 0.29	$ 0.40	$ 1.16	$ 1.01