Stock-Based Compensation - Assumptions and Activity (Details) - Stock Options. - USD ($)	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Shares
Outstanding at beginning of period (in shares)	16,168
Granted (in shares)	0	0
Exercised (in shares)	0	(500)
Outstanding at end of period (in shares)	16,168
Exercisable at end of period (in shares)	8,084
Weighted Average Exercise Price
Outstanding at beginning of period (in dollars per shares)	$ 14.40
Outstanding at end of period (in dollars per share)	14.40
Exercisable at end of period (in dollars per share)	$ 15.49
Aggregate intrinsic value of all options outstanding	$ 1,000