Acquisitions - Pro-forma Financial Information of Combined Entities (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
HCB and Subsidiary
Business Acquisition [Line Items]
Total revenues, net of interest expense	$ 64,149	$ 62,684	$ 58,400
Net income	$ 18,042	$ 16,861	$ 11,271
Diluted earnings per share (in USD per share)	$ 1.68	$ 1.57	$ 1.24
HCB and FCB
Business Acquisition [Line Items]
Total revenues, net of interest expense	$ 83,239	$ 82,191	$ 77,894
Net income	$ 21,259	$ 19,874	$ 15,133
Diluted earnings per share (in USD per share)	$ 1.73	$ 1.62	$ 1.41