Earning Per Share - Summary of Basic and Diluted Earnings Per Share (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
Basic net income per share calculation:
Numerator – Net income	$ 3,656	$ 4,419	$ 10,363	$ 1,409
Denominator – Average common shares outstanding	12,040,229	11,279,364	11,851,476	11,239,093
Basic net income per share of common stock	$ 0.30	$ 0.39	$ 0.87	$ 0.13
Diluted net income per share calculation:
Numerator – Net income	$ 3,656	$ 4,419	$ 10,363	$ 1,409
Dilutive shares contingently issuable	1,073,546	1,471,059	1,201,282	1,518,998
Average diluted common shares outstanding	13,113,775	12,750,423	13,052,758	12,758,091
Diluted net income per share of common stock	$ 0.28	$ 0.35	$ 0.79	$ 0.11