Condensed Consolidated Statements of Changes in Shareholders’ Equity (Unaudited) - USD ($) $ in Thousands	Common Stock	Additional Paid-in Capital	Retained Earnings	Treasury Stock	Accumulated Other Comprehensive Income (Loss)	Total
Beginning balance at Dec. 31, 2016	$ 230	$ 278,501	$ 95,274	$ (15,446)	$ (922)	$ 357,637
Beginning balance, shares at Dec. 31, 2016	22,971,504			(909,432)
Net income			15,567			15,567
Dividends on common stock			(2,206)			(2,206)
Stock-based compensation expense		16				16
Exercise of stock options				$ 17		17
Exercise of stock options (in shares)				1,000
Other comprehensive income, net of tax					933	933
Ending balance at Jun. 30, 2017	$ 230	278,517	108,635	$ (15,429)	11	371,964
Ending balance, shares at Jun. 30, 2017	22,971,504			(908,432)
Beginning balance at Dec. 31, 2017	$ 257	343,249	118,353	$ (15,256)	(389)	446,214
Beginning balance, shares at Dec. 31, 2017	25,731,504			(898,272)
Net income			20,154			20,154
Dividends on common stock			(2,507)			(2,507)
Stock-based compensation expense		739				739
Exercise of stock options		(181)		$ 431		250
Exercise of stock options (in shares)				25,400
Other comprehensive income, net of tax					(3,655)	(3,655)
Ending balance at Jun. 30, 2018	$ 257	$ 343,807	$ 136,000	$ (14,825)	$ (4,044)	$ 461,195
Ending balance, shares at Jun. 30, 2018	25,731,504			(872,872)