Stock Compensation Plan - Summary of Option Activity (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended	6 Months Ended	12 Months Ended
	Jun. 30, 2017	Jun. 30, 2017	Dec. 31, 2016
Options
Outstanding as of beginning of period (in shares)		62,000
Granted (in shares)		0
Exercised (in shares)	(48,586)	(48,586)
Forfeited (in shares)		0
Expired (in shares)		(8,414)
Outstanding as of end of period (in shares)	5,000	5,000	62,000
Exercisable (in shares)	5,000	5,000
Weighted-Average Exercise Price
Outstanding as of beginning of period (in dollars per share)		$ 25.71
Granted (in dollars per share)		0.00
Exercised (in dollars per share)		25.99
Forfeited (in dollars per share)		0.00
Expired (in dollars per share)		26.00
Outstanding as of end of period (in dollars per share)	$ 22.50	22.50	$ 25.71
Exercisable (in dollars per share)	$ 22.50	$ 22.50
Aggregate Intrinsic Value
Outstanding as of beginning of period		$ 219
Exercised		80
Outstanding as of end of period	$ 27	27	$ 219
Exercisable as of end of period	$ 27	$ 27
Weighted-Average Remaining Term (in years)
Outstanding		1 year 4 months 24 days	7 months 6 days
Exercisable as of the end of the period		1 year 4 months 24 days