Share-Based Compensation - Stock Option Activity (Details) - $ / shares	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Outstanding, beginning of year (in shares)	75,456	77,369	142,000
Granted (in shares)	0	0	0
Exercised (in shares)	(16,594)	(1,463)	(62,331)
Cancelled/Forfeited (in shares)	(3,750)	(450)	(2,300)
Outstanding, end of year (in shares)	55,112	75,456	77,369
Outstanding, Weighted average exercise price (in dollars per share)	$ 14.00	$ 14.00	$ 14.00	$ 14.00
Granted, Weighted average exercise price (in dollars per share)	0.00	0.00	0.00
Exercised, Weighted average exercise price (in dollars per share)	14.00	14.00	14.00
Canceled/Forfeited, Weighted average exercise price (in dollars per share)	$ 14.00	$ 14.00	$ 14.00
Exercisable at end of year (in shares)	39,688	37,108	19,131
Exercisable at end of year, Weighted average exercise price (in dollars per share)	$ 14.00	$ 14.00	$ 14.00