Share Based Compensation (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016	Mar. 31, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of additional shares approved for grant (in shares)	100,000
Total compensation cost not yet recognized	$ 3,200
Total compensation cost not yet recognized, period for recognition	2 years 6 months
Information regarding options exercised [Abstract]
Intrinsic value	$ 279	$ 117
Cash proceeds received	66	32
Tax benefit realized	98	41
Long-term Incentive Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total compensation expense recognized	400	400
Tax benefit relating to compensation expense recognized	$ 100	$ 100
Stock Options [Member]
Number of Shares [Roll Forward]
Outstanding, beginning balance (in shares)	211,018
Granted (in shares)	0
Exercised (in shares)	(15,992)
Forfeited (in shares)	0
Expired (in shares)	0
Outstanding, ending balance (in shares)	195,026
Vested and expected to vest, period end (in shares)	195,026
Exercisable, period end (in shares)	195,026
Average Exercise Price [Roll Forward]
Outstanding, beginning balance (in dollars per share)	$ 5.05
Exercised (in dollars per share)	4.14
Outstanding, ending balance (in dollars per share)	5.12
Vested and expected to vest, period end (in dollars per share)	5.12
Exercisable, period end (in dollars per share)	$ 5.12
Weighted-Average Remaining Contractual Term (Years) [Abstract]
Outstanding, Weighted Average Remaining Contractual Term	4 years 10 months 6 days
Vested and Expected to Vest, Weighted-Average Remaining Contractual Term	4 years 10 months 6 days
Exercisable, Weighted Average Remaining Contractual Term	4 years 10 months 6 days
Aggregate Intrinsic Value [Abstract]
Outstanding, Aggregate Intrinsic Value	$ 3,038
Vested and Expected to Vest, Outstanding, Aggregate Intrinsic Value	3,038
Exercisable, Aggregate Intrinsic Value	$ 3,038
Non Vested Restricted Stock and PSU's [Member]
Number of Shares [Roll Forward]
Outstanding, beginning balance (in shares)	296,422
Granted (in shares)	68,473
Vested (in shares)	(50,297)
Forfeited (in shares)	(5,727)
Outstanding, ending balance (in shares)	308,871
Weighted Average Grant Date Fair Value [Roll Forward]
Outstanding, beginning balance (in dollars per share)	$ 14.52
Granted (in dollars per share)	21.07
Vested (in dollars per share)	14.81
Forfeited (in dollars per share)	15.57
Outstanding, ending balance (in dollars per share)	$ 15.85
Directors [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares issues as retainer fees (in shares)	2,000	2,000
Non-Employee Directors [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of additional shares approved for grant (in shares)	200,000
Total compensation expense recognized	$ 40	$ 30
Tax benefit relating to compensation expense recognized	$ 10	$ 10
Officers [Member] | Restricted Stock [Member] | Long-term Incentive Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of stock units or restricted shares issued in period (in shares)	50,000	70,000
Vesting period	3 years	3 years
Officers [Member] | Performance Stock Units [Member] | Long-term Incentive Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of stock units or restricted shares issued in period (in shares)	20,000	30,000
Vesting period		3 years	3 years