Share-Based Payments and Other Compensation - Summary of Stock Option Activity (Details) - $ / shares	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Stock options
Outstanding as of beginning of year, in shares	445,036	545,036	555,036
Granted, in shares	95,674
Forfeited, in shares		(100,000)	(10,000)
Outstanding at beginning of year, in shares	540,710	445,036	545,036
Exercisable at end of year, in shares	468,958	333,777	272,518
Weighted Average Exercise Price Per Share
Outstanding at beginning of year, in dollars per share	$ 17.05	$ 17.01	$ 17.00
Granted, in dollars per share	17.74
Forfeited, in dollars per share		16.80	16.80
Outstanding at end of year, in dollars per share	17.17	17.05	17.01
Exercisable at the end of year, in dollars per share	$ 17.09	$ 17.05	$ 17.01
Stock options, additional information
Weighted average remaining contractual life of stock options	9 years 1 month 6 days