Share Based Compensation (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended				9 Months Ended
	Sep. 30, 2017	Mar. 31, 2017	Sep. 30, 2016	Mar. 31, 2016	Sep. 30, 2017	Sep. 30, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of additional shares approved for grant (in shares)					500,000
Total compensation cost not yet recognized	$ 2,300				$ 2,300
Total compensation cost not yet recognized, period for recognition					2 years 2 months 12 days
Information regarding options exercised [Abstract]
Intrinsic value	39		$ 9		$ 513	$ 186
Cash proceeds received	18		5		117	64
Tax benefit realized	$ 14		$ 3		180	65
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)	0		0
Total compensation expense recognized	$ 400		$ 300		1,200	1,100
Tax benefit relating to compensation expense recognized	$ 100		100		$ 400	$ 400
Stock Options [Member]
Number of Shares [Roll Forward]
Outstanding, beginning balance (in shares)		211,018			211,018
Granted (in shares)					0
Exercised (in shares)					(28,963)
Forfeited (in shares)					0
Expired (in shares)					0
Outstanding, ending balance (in shares)	182,055				182,055
Vested and expected to vest, period end (in shares)	182,055				182,055
Exercisable, period end (in shares)	182,055				182,055
Average Exercise Price [Roll Forward]
Outstanding, beginning balance (in dollars per share)		$ 5.05			$ 5.05
Exercised (in dollars per share)					4.03
Outstanding, ending balance (in dollars per share)	$ 5.21				5.21
Vested and expected to vest, period end (in dollars per share)	5.21				5.21
Exercisable, period end (in dollars per share)	$ 5.21				$ 5.21
Weighted-Average Remaining Contractual Term (Years) [Abstract]
Outstanding, Weighted Average Remaining Contractual Term					4 years 4 months 24 days
Vested and Expected to Vest, Weighted-Average Remaining Contractual Term					4 years 4 months 24 days
Exercisable, Weighted Average Remaining Contractual Term					4 years 4 months 24 days
Aggregate Intrinsic Value [Abstract]
Outstanding, Aggregate Intrinsic Value	$ 3,175				$ 3,175
Vested and Expected to Vest, Aggregate Intrinsic Value	3,175				3,175
Exercisable, Aggregate Intrinsic Value	$ 3,175				$ 3,175
Non-Vested Restricted Stock and PSUs [Member]
Number of Shares [Roll Forward]
Outstanding, beginning balance (in shares)		296,422			296,422
Granted (in shares)					68,473
Vested (in shares)					(63,799)
Forfeited (in shares)					(8,510)
Outstanding, ending balance (in shares)	292,586				292,586
Weighted Average Grant Date Fair Value [Roll Forward]
Outstanding, beginning balance (in dollars per share)		$ 14.52			$ 14.52
Granted (in dollars per share)					21.07
Vested (in dollars per share)					14.91
Forfeited (in dollars per share)					15.59
Outstanding, ending balance (in dollars per share)	$ 15.88				$ 15.88
Directors [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares issues as retainer fees (in shares)					6,000	6,000
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	$ 50		30		$ 120	$ 90
Tax benefit relating to compensation expense recognized	$ 20		$ 10		$ 40	$ 30
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