Employee Benefits and Stock Compensation - Summary of Stock Options Outstanding and Exercisable (Details) - Stock options $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2018 USD ($) $ / shares shares
Options
Options, outstanding at beginning of period (in shares) | shares	951,349
Options granted (in shares) | shares	219,118
Options, exercised (in shares) | shares	(175,541)
Options, forfeited (in shares) | shares	(61,431)
Options, outstanding at end of period (in shares) | shares	933,495
Options, exercisable at end of period (in shares) | shares	447,033
Weighted-Average Exercise Price
Weighted-average exercise price at beginning of period (in dollars per share) | $ / shares	$ 17.29
Weighted-average exercise price, granted (in dollars per share) | $ / shares	30.98
Weighted-average exercise price, exercised (in dollars per share) | $ / shares	11.45
Weighted-average exercise price, forfeited (in dollars per share) | $ / shares	11.17
Weighted-average exercise price at end of period (in dollars per share) | $ / shares	22.00
Weighted-average exercise price, exercisable at end of period (in dollars per share) | $ / shares	$ 16.50
Weighted- Average Remaining Contractual Term and Aggregate Intrinsic Value
Weighted-average remaining contractual term, outstanding	7 years 1 month 2 days
Weighted-average remaining contractual term, exercisable	6 years 14 days
Aggregate intrinsic value, outstanding | $	$ 5,569
Aggregate intrinsic value, exercisable | $	$ 4,511