Stock Options and Restricted Shares - Summary of Activity in Stock Options (Details) - $ / shares	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Shares, Abstract
Shares Outstanding, Beginning Balance	507,903
Shares Outstanding, Granted	0	0
Shares Outstanding, Exercised	(182,002)
Shares Outstanding, Ending Balance	325,901
Shares, Fully Vested and Expected to Vest	325,305
Shares, Exercisable at End of Period	319,651
Weighted Average Exercise Price, Abstract
Weighted Average Exercise Price Outstanding, Beginning Balance	$ 8.66
Weighted Average Exercise Price Outstanding, Exercised	6.48
Weighted Average Exercise Price Outstanding, Ending Balance	9.88
Weighted Average Exercise Price, Fully vested and expected to vest	9.88
Weighted Average Exercise Price, Exercisable at End of Period	$ 9.82
Weighted Average Remaining Contractual Term (year), Abstract
Weighted Average Remaining Contractual Term Outstanding	4 years 2 months 12 days
Weighted Average Remaining Contractual Term, Fully Vested and Expected to Vest	4 years 2 months 12 days
Weighted Average Remaining Contractual Term, Exercisable at End of Period	4 years 1 month 6 days