Employee Benefits and Stock Compensation - Summary of Information Related to Stock Options (Details)	12 Months Ended
	Dec. 31, 2018 $ / shares shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options outstanding (in shares) | shares	933,495
Remaining Contractual Life (Years)	7 years 1 month 6 days
Options exercisable (in shares) | shares	447,033
Weighted average exercise price (in dollars per share)	$ 16.50
$10.54 to $14.82
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options outstanding (in shares) | shares	391,113
Remaining Contractual Life (Years)	5 years 2 months 12 days
Options exercisable (in shares) | shares	311,759
Weighted average exercise price (in dollars per share)	$ 12.23
Range of exercise prices, lower limit	10.54
Range of exercise prices,upper limit	$ 14.82
$15.99 to $28.69
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options outstanding (in shares) | shares	333,281
Remaining Contractual Life (Years)	8 years
Options exercisable (in shares) | shares	135,274
Weighted average exercise price (in dollars per share)	$ 26.35
Range of exercise prices, lower limit	15.99
Range of exercise prices,upper limit	$ 28.69
$31.15 to $31.15
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options outstanding (in shares) | shares	209,101
Remaining Contractual Life (Years)	9 years 3 months 18 days
Options exercisable (in shares) | shares	0
Weighted average exercise price (in dollars per share)	$ 0.00
Range of exercise prices, lower limit	31.15
Range of exercise prices,upper limit	$ 31.15