Share Based Compensation (Details) $ / shares in Units, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018 USD ($) Officer $ / shares shares	Jun. 30, 2017 USD ($) shares	Jun. 30, 2018 USD ($) $ / shares shares	Jun. 30, 2017 USD ($) shares
Share Based Compensation [Abstract]
Number of additional shares approved for grant (in shares)			500,000
Total compensation cost not yet recognized | $	$ 2,800		$ 2,800
Total compensation cost not yet recognized, period for recognition			2 years 2 months 12 days
Information regarding options exercised [Abstract]
Intrinsic value | $	1,596	$ 195	$ 1,674	$ 474
Cash proceeds received | $	971	33	984	99
Tax benefit realized | $	336	68	352	166
Long-Term Incentive Plan [Member]
Share Based Compensation [Abstract]
Total compensation expense recognized | $	400	400	700	800
Tax benefit relating to compensation expense recognized | $	$ 100	200	$ 200	$ 300
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)			(105,208)
Forfeited (in shares)			0
Expired (in shares)			0
Outstanding, ending balance (in shares)	258,762		258,762
Vested and expected to vest, period end (in shares)	258,762		258,762
Exercisable, period end (in shares)	258,762		258,762
Average Exercise Price [Roll Forward]
Outstanding, beginning balance (in dollars per share) | $ / shares			$ 5.24
Issued for acquisition (in dollars per share) | $ / shares			9.94
Exercised (in dollars per share) | $ / shares			9.35
Outstanding, ending balance (in dollars per share) | $ / shares	$ 6.98		6.98
Vested and expected to vest, period end (in dollars per share) | $ / shares	6.98		6.98
Exercisable, period end (in dollars per share) | $ / shares	$ 6.98		$ 6.98
Weighted-Average Remaining Contractual Term (Years) [Abstract]
Outstanding, weighted average remaining contractual term			4 years 10 months 24 days
Vested and expected to vest, weighted-average remaining contractual term			4 years 10 months 24 days
Exercisable, weighted average remaining contractual term			4 years 10 months 24 days
Aggregate Intrinsic Value [Abstract]
Outstanding, aggregate intrinsic value | $	$ 4,791		$ 4,791
Vested and expected to vest, aggregate intrinsic value | $	4,791		4,791
Exercisable, aggregate intrinsic value | $	$ 4,791		$ 4,791
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 (in years)			3 years 1 month 20 days
Expected volatility			45.99%
Per share weighted-average fair value (in dollars per share) | $ / shares	$ 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)			(95,958)
Forfeited (in shares)			(7,786)
Outstanding, ending balance (in shares)	260,189		260,189
Weighted Average Grant Date Fair Value [Roll Forward]
Outstanding, beginning balance (in dollars per share) | $ / shares			$ 15.88
Granted (in dollars per share) | $ / shares			23.62
Vested (in dollars per share) | $ / shares			13.16
Forfeited (in dollars per share) | $ / shares			18.41
Outstanding, ending balance (in dollars per share) | $ / shares	$ 19.00		$ 19.00
Directors [Member]
Share Based Compensation [Abstract]
Shares issues as retainer fees (in shares)			5,000	5,000
Non-Employee Directors [Member]
Share Based Compensation [Abstract]
Number of additional shares approved for grant (in shares)			200,000
Total compensation expense recognized | $	$ 50	40	$ 110	$ 70
Tax benefit relating to compensation expense recognized | $	$ 10	$ 10	$ 20	$ 30
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)	10,000	0	50,000	50,000
Number of executive officers granted shares | Officer	1
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