Stock-Based Compensation - Summary of Options Outstanding and Exercisable by Price Range (Details)	12 Months Ended
	Dec. 31, 2017 $ / shares shares
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Number of Outstanding Options (in shares) | shares	50,985
Weighted- Average Remaining Contractual Life	8 months 45 days
Weighted- Average Exercise Price (in dollars per share)	$ 24.09
$20.00 to $25.00
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Exercise price range, minimum (in dollars per share)	20.00
Exercise price range, maximum (in dollars per share)	$ 25.00
Number of Outstanding Options (in shares) | shares	27,060
Weighted- Average Remaining Contractual Life	1 year 15 days
Weighted- Average Exercise Price (in dollars per share)	$ 22.10
$25.01 to $30.00
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Exercise price range, minimum (in dollars per share)	25.01
Exercise price range, maximum (in dollars per share)	$ 30.00
Number of Outstanding Options (in shares) | shares	22,275
Weighted- Average Remaining Contractual Life	5 months 50 days
Weighted- Average Exercise Price (in dollars per share)	$ 25.82
$30.01 to $41.67
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Exercise price range, minimum (in dollars per share)	30.01
Exercise price range, maximum (in dollars per share)	$ 41.67
Number of Outstanding Options (in shares) | shares	1,650
Weighted- Average Remaining Contractual Life	5 days
Weighted- Average Exercise Price (in dollars per share)	$ 33.33