Share Based Compensation (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Share Based Compensation [Abstract]
Number of additional shares approved for grant (in shares)			500,000
Total compensation cost not yet recognized	$ 2,700		$ 2,700
Total compensation cost not yet recognized, period for recognition			2 years
Information regarding options exercised [Abstract]
Intrinsic value	0	$ 1,596	$ 836	$ 1,674
Cash proceeds received	0	971	695	984
Tax benefit realized	0	336	176	352
Long-Term Incentive Plan [Member]
Share Based Compensation [Abstract]
Total compensation expense recognized	400	400	800	700
Tax benefit relating to compensation expense recognized	$ 100	$ 100	$ 200	200
Stock Options [Member]
Number of Shares [Roll Forward]
Outstanding, beginning balance (in shares)			211,421
Granted (in shares)			0
Exercised (in shares)			(68,399)
Forfeited (in shares)			0
Expired (in shares)			(558)
Outstanding, ending balance (in shares)	142,464		142,464
Vested and expected to vest, period end (in shares)	142,464		142,464
Exercisable, period end (in shares)	142,464		142,464
Average Exercise Price [Roll Forward]
Outstanding, beginning balance (in dollars per share)			$ 6.48
Exercised (in dollars per share)			10.16
Expired (in dollars per share)			22.35
Outstanding, ending balance (in dollars per share)	$ 4.66		4.66
Vested and expected to vest, period end (in dollars per share)	4.66		4.66
Exercisable, period end (in dollars per share)	$ 4.66		$ 4.66
Weighted-Average Remaining Contractual Term (Years) [Abstract]
Outstanding, weighted average remaining contractual term			3 years 6 months
Vested and expected to vest, weighted-average remaining contractual term			3 years 6 months
Exercisable, weighted average remaining contractual term			3 years 6 months
Aggregate Intrinsic Value [Abstract]
Outstanding, aggregate intrinsic value	$ 2,442		$ 2,442
Vested and expected to vest, aggregate intrinsic value	2,442		2,442
Exercisable, aggregate intrinsic value	$ 2,442		$ 2,442
Restricted Stock [Member] | Long-Term Incentive Plan [Member]
Share Based Compensation [Abstract]
Number of stock units or restricted shares issued in period (in shares)	2,000	2,000
Vesting period	3 years	3 years
Non-Vested Restricted Stock and PSUs [Member]
Number of Shares [Roll Forward]
Outstanding, beginning balance (in shares)			258,419
Granted (in shares)			78,283
Vested (in shares)			(85,788)
Forfeited (in shares)			(11,475)
Outstanding, ending balance (in shares)	239,439		239,439
Weighted Average Grant Date Fair Value [Roll Forward]
Outstanding, beginning balance (in dollars per share)			$ 19.00
Granted (in dollars per share)			22.98
Vested (in dollars per share)			14.55
Forfeited (in dollars per share)			22.91
Outstanding, ending balance (in dollars per share)	$ 21.72		$ 21.72
Non-Employee Directors [Member]
Share Based Compensation [Abstract]
Number of additional shares approved for grant (in shares)			200,000
Total compensation expense recognized	$ 60	$ 50	$ 110	110
Tax benefit relating to compensation expense recognized	$ 10	$ 10	$ 20	$ 20
Executive Officers [Member] | Restricted Stock [Member] | Long-Term Incentive Plan [Member]
Share Based Compensation [Abstract]
Number of stock units or restricted shares issued in period (in shares)	4,000	9,000	50,000	50,000
Vesting period			3 years	3 years
Executive Officers [Member] | Performance Stock Units [Member] | Long-Term Incentive Plan [Member]
Share Based Compensation [Abstract]
Number of stock units or restricted shares issued in period (in shares)			20,000	20,000
Vesting period			3 years	3 years
Performance feature comparison period			3 years
Directors [Member]
Share Based Compensation [Abstract]
Shares issues as retainer fees (in shares)			5,000	5,000