Share Based Compensation (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Share Based Compensation [Abstract]
Number of additional shares approved for grant (in shares)			500,000
Total compensation cost not yet recognized	$ 2,400		$ 2,400
Total compensation cost not yet recognized, period for recognition			2 years
Information regarding options exercised [Abstract]
Intrinsic value	153	$ 39	$ 1,827	$ 513
Cash proceeds received	58	18	1,042	117
Tax benefit realized	32	14	384	180
Long-Term Incentive Plan [Member]
Share Based Compensation [Abstract]
Total compensation expense recognized	400	400	1,100	1,200
Tax benefit relating to compensation expense recognized	$ 100	100	$ 200	$ 400
Stock Options [Member]
Number of Shares [Roll Forward]
Outstanding, beginning balance (in shares)			176,055
Issued for acquisition (in shares)			187,915
Exercised (in shares)			(113,548)
Forfeited (in shares)			0
Expired (in shares)			0
Outstanding, ending balance (in shares)	250,422		250,422
Vested and expected to vest, period end (in shares)	250,422		250,422
Exercisable, period end (in shares)	250,422		250,422
Average Exercise Price [Roll Forward]
Outstanding, beginning balance (in dollars per share)			$ 5.24
Issued for acquisition (in dollars per share)			9.94
Exercised (in dollars per share)			9.18
Outstanding, ending balance (in dollars per share)	$ 6.98		6.98
Vested and expected to vest, period end (in dollars per share)	6.98		6.98
Exercisable, period end (in dollars per share)	$ 6.98		$ 6.98
Weighted-Average Remaining Contractual Term (Years) [Abstract]
Outstanding, weighted average remaining contractual term			4 years 8 months 12 days
Vested and expected to vest, weighted-average remaining contractual term			4 years 8 months 12 days
Exercisable, weighted average remaining contractual term			4 years 8 months 12 days
Aggregate Intrinsic Value [Abstract]
Outstanding, aggregate intrinsic value	$ 4,174		$ 4,174
Vested and expected to vest, aggregate intrinsic value	4,174		4,174
Exercisable, aggregate intrinsic value	$ 4,174		$ 4,174
Weighted-average assumptions used in the Black-Scholes option pricing model [Abstract]
Expected dividend yield			2.62%
Risk-free interest rate			2.40%
Expected life			3 years 1 month 20 days
Expected volatility			45.99%
Per share weighted-average fair value (in dollars per share)	$ 13.25		$ 13.25
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
Vesting period			3 years
Non-Vested Restricted Stock and PSUs [Member]
Number of Shares [Roll Forward]
Outstanding, beginning balance (in shares)			290,527
Granted (in shares)			73,406
Vested (in shares)			(96,255)
Forfeited (in shares)			(8,259)
Outstanding, ending balance (in shares)	259,419		259,419
Weighted Average Grant Date Fair Value [Roll Forward]
Outstanding, beginning balance (in dollars per share)			$ 15.88
Granted (in dollars per share)			23.62
Vested (in dollars per share)			13.17
Forfeited (in dollars per share)			18.53
Outstanding, ending balance (in dollars per share)	$ 19.00		$ 19.00
Directors [Member]
Share Based Compensation [Abstract]
Shares issues as retainer fees (in shares)			7,000	6,000
Non-Employee Directors [Member]
Share Based Compensation [Abstract]
Number of additional shares approved for grant (in shares)			200,000
Total compensation expense recognized	$ 50	50	$ 160	$ 120
Tax benefit relating to compensation expense recognized	$ 10	$ 20	$ 30	$ 40
Officers [Member] | Long-Term Incentive Plan [Member]
Share Based Compensation [Abstract]
Number of stock units or restricted shares issued in period (in shares)	0	0
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)			50,000	50,000
Vesting period			3 years	3 years
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