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Consolidated Statements of Equity (Unaudited) - USD ($) $ in Thousands	Common Stock [Member]	Additional Paid-in Capital [Member]	Retained Earnings [Member]	AOCI Attributable to Parent [Member]	Total
Balances (in shares) at Dec. 31, 2017	26,106,623
Balance at Dec. 31, 2017	$ 5,100	$ 526	$ 332,378	$ (12,509)	$ 325,495
Net income			9,617		9,617
Other comprehensive income				699	699
Cash dividends			(3,263)		(3,263)
Balances (in shares) at Mar. 31, 2018	26,106,623
Balance at Mar. 31, 2018	$ 5,100	526	338,732	(11,810)	332,548
Balances (in shares) at Dec. 31, 2017	26,106,623
Balance at Dec. 31, 2017	$ 5,100	526	332,378	(12,509)	325,495
Net income					19,790
Other comprehensive income					765
Balances (in shares) at Jun. 30, 2018	26,108,045
Balance at Jun. 30, 2018	$ 5,100	564	345,647	(11,744)	339,567
Balances (in shares) at Mar. 31, 2018	26,106,623
Balance at Mar. 31, 2018	$ 5,100	526	338,732	(11,810)	332,548
Net income			10,173		10,173
Other comprehensive income				66	66
Stock based compensation (in shares)	1,422
Stock based compensation		38	6		44
Cash dividends			(3,264)		(3,264)
Balances (in shares) at Jun. 30, 2018	26,108,045
Balance at Jun. 30, 2018	$ 5,100	564	345,647	(11,744)	339,567
Balances (in shares) at Dec. 31, 2018	26,117,045
Balance at Dec. 31, 2018	$ 5,102	2,539	308,914	(23,423)	293,132
Net income			7,222		7,222
Other comprehensive income				164	164
Stock based compensation (in shares)	6,647
Stock based compensation	$ 1	(81)	35		(45)
Cash dividends			(3,526)		(3,526)
Balances (in shares) at Mar. 31, 2019	26,123,692
Balance at Mar. 31, 2019	$ 5,103	2,458	312,645	(23,259)	296,947
Balances (in shares) at Dec. 31, 2018	26,117,045
Balance at Dec. 31, 2018	$ 5,102	2,539	308,914	(23,423)	293,132
Net income					17,702
Other comprehensive income					1,125
Balances (in shares) at Jun. 30, 2019	26,124,393
Balance at Jun. 30, 2019	$ 5,104	2,943	319,600	(22,298)	305,349
Balances (in shares) at Mar. 31, 2019	26,123,692
Balance at Mar. 31, 2019	$ 5,103	2,458	312,645	(23,259)	296,947
Net income			10,480		10,480
Other comprehensive income				961	961
Stock based compensation (in shares)	701
Stock based compensation	$ 1	485	2		488
Cash dividends			(3,527)		(3,527)
Balances (in shares) at Jun. 30, 2019	26,124,393
Balance at Jun. 30, 2019	$ 5,104	$ 2,943	$ 319,600	$ (22,298)	$ 305,349

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