Share-based Compensation Plans - Share-Based Compensation Expense (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Summary of the expenses the Company has recognized related to share-based compensation
Compensation expense:	$ 1,362	$ 1,092	$ 993
Unrecognized compensation expense:	2,122	1,762	2,032
Stock options
Summary of the expenses the Company has recognized related to share-based compensation
Compensation expense:	416	506	490
Unrecognized compensation expense:	$ 564	963	1,065
Weighted-average period over which expense is expected to be recognized	2 years
Restricted stock awards
Summary of the expenses the Company has recognized related to share-based compensation
Compensation expense:	$ 674	586	503
Unrecognized compensation expense:	$ 834	799	967
Weighted-average period over which expense is expected to be recognized	1 year 8 months 12 days
Restricted stock units
Summary of the expenses the Company has recognized related to share-based compensation
Compensation expense:	$ 272	$ 0	$ 0
Unrecognized compensation expense:	724
Allocated Share-based Compensation Expense, Settle in Cash	224
Allocated Share-based Compensation Expense, Settle in Shares	$ 48
Weighted-average period over which expense is expected to be recognized	2 years 3 months 18 days