Share-based Compensation Plans - Stock Options (Details) - USD ($) $ / shares in Units, $ in Thousands	6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015
Aggregate intrinsic value of options exercised
Income tax benefit recognized related to share-based compensation	$ 108	$ 69
Stock options
Number of shares
Options outstanding, at the beginning of the period (in shares)	932,553
Granted (in shares)	36,022
Forfeited (in shares)	(28,490)
Exercised (in shares)	(7,877)
Options outstanding, at the end of the period (in shares)	932,208
Exercisable, at the end of the period (in shares)	443,434
Vested and expected to vest , at the end of the period (in shares)	898,496
Weighted Average Exercise Price
Options outstanding, at the beginning of the period (in dollars per share)	$ 7.19
Granted (in dollars per share)	7.27
Forfeited (in dollars per share)	7.47
Exercised (in dollars per share)	6.15
Options outstanding, at the end of the period (in dollars per share)	7.20
Exercisable, at the end of the period (in dollars per share)	7.00
Vested and expected to vest , at the end of the period (in dollars per share)	$ 7.19
Average Remaining Life (years)
Outstanding, at end of period	7 years 3 months 22 days
Exercisable, at the end of the period	5 years 11 months 12 days
Vested and expected to vest, at the end of the period	7 years 3 months 4 days
Average Intrinsic Value
Outstanding, at the end of the period	$ 1,019,659
Exercisable, at the end of the period	729,326
Vested and expected to vest, at the end of the period	1,003,426
Aggregate intrinsic value of options exercised
Total intrinsic value of options exercised	12
Income tax benefit recognized related to share-based compensation	$ 108
Stock options | Minimum
Summary of the expenses the Company has recognized related to share-based compensation
Vesting period	3 years
Stock options | Maximum
Summary of the expenses the Company has recognized related to share-based compensation
Vesting period	5 years