Stock Compensation - Summary of Transactions of Stock Option Plans (Details) - Stock Options - $ / shares	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Weighted-average exercise price
Options granted (in dollars per share)	$ 13.58	$ 11.54
Omnibus Incentive Plan
Number of shares
Beginning balance (in shares)	369,612	406,640	404,756
Options granted (in shares)	42,302	49,510	47,916
Options exercised (in shares)	(27,656)	(86,538)	(46,032)
Options forfeited (in shares)	0	0	0
Ending balance (in shares)	384,258	369,612	406,640
Exercisable options (in shares)	242,522	210,940	222,032
Weighted-average exercise price
Beginning balance (in dollars per share)	$ 22.35	$ 20.90	$ 19.64
Options granted (in dollars per share)	33.98	28.33	27.18
Options exercised (in dollars per share)	20.59	18.98	16.29
Ending balance (in dollars per share)	23.75	22.35	20.90
Exercisable options (in dollars per share)	$ 21.01	$ 20.48	$ 19.84
Omnibus Incentive Plan | Price range $18.08 — $18.30
Number of shares
Ending balance (in shares)	106,660
Weighted-average exercise price
Ending balance (in dollars per share)	$ 18.15
Price range - minimum (in dollars per share)	18.08
Price range - maximum (in dollars per share)	$ 18.30
Weighted-average contractual life	5 years
Omnibus Incentive Plan | Price range $18.30 — $19.35
Number of shares
Ending balance (in shares)	119,516
Weighted-average exercise price
Ending balance (in dollars per share)	$ 21.48
Price range - minimum (in dollars per share)	18.30
Price range - maximum (in dollars per share)	$ 19.35
Weighted-average contractual life	4 years 1 month 6 days
Omnibus Incentive Plan | Price range $19.35 — $33.75
Number of shares
Ending balance (in shares)	158,082
Weighted-average exercise price
Ending balance (in dollars per share)	$ 29.25
Price range - minimum (in dollars per share)	19.35
Price range - maximum (in dollars per share)	$ 33.75
Weighted-average contractual life	7 years 2 months 12 days