Share-Based Compensation - Summary of Stock Options (Details) - $ / shares	6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]
Outstanding at beginning of period, shares	452,530	337,696
Granted, shares	0	0
Forfeited or expired, shares	(44,350)	0
Exercised, shares	(19,591)	0
Stock dividend or split, shares	0	0
Outstanding at end of period, shares	388,589	337,696
Exercisable at end of period, shares	262,718	230,732
Weighted Average Exercise Price (in usd per share)	$ 12.42
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Roll Forward]
Outstanding at beginning of period, Weighted Average Exercise Price Per Share (in dollars per share)	12.09	$ 12.43
Granted, Weighted Average Exercise Price Per Share (in dollars per share)	0.00	0.00
Forfeited or expired, Weighted Average Exercise Price per Share (in dollars per share)	15.97	0.00
Exercised, Weighted Average Exercise Price per Share (in dollars per share)	9.30	0.00
Stock dividend or split, Weighted Average Exercise Price per Share (in dollars per share)	0.00	0.00
Outstanding at end of period, Weighted Average Exercise Price per Share (in dollars per share)	$ 11.78	12.43
Weighted Average Exercise Price per Share, Exercisable (in dollars per share)		$ 14.12