Stock-Based Compensation - Schedule of Stock Option Activity (Details) - $ / shares	3 Months Ended	6 Months Ended
	Jun. 30, 2019	Jun. 30, 2019
Shares
Options outstanding (in shares)	21,001	50,601
Forfeited (in shares)	0	0
Expired (in shares)	0	0
Exercised (in shares)	(4,475)	(34,075)
Options outstanding (in shares)	16,526	16,526
Weighted Average Exercise Price
Options outstanding, weighted average exercise price (in dollars per share)	$ 18.32	$ 18.28
Forfeited, weighted average exercise price (in dollars per share)	0	0
Expired, weighted average exercise price (in dollars per share)	0	0
Exercised, weighted average exercise price (in dollars per share)	18.27	18.25
Options outstanding, weighted average exercise price (in dollars per share)	18.33	18.33
Weighted Average Grant Date Fair Value
Options outstanding, weighted average grant date fair value (in dollars per share)	4.95	4.68
Forfeited, weighted average grant date fair value (in dollars per share)	0	0
Expired, weighted average grant date fair value (in dollars per share)	0	0
Exercised, weighted average grant date fair value (in dollars per share)	4.42	4.48
Options outstanding, weighted average grant date fair value (in dollars per share)	$ 5.09	$ 5.09