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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 (loss)				699	699
Cash dividends			(3,263)		(3,263)
Balance at Mar. 31, 2018	$ 5,100	526	338,732	(11,810)	332,548
Balances (in shares) at Mar. 31, 2018	26,106,623
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					30,491
Other comprehensive income (loss)					1,190
Balance at Sep. 30, 2018	$ 5,102	840	353,116	(11,319)	347,739
Balances (in shares) at Sep. 30, 2018	26,117,045
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 (loss)				66	66
Stock based compensation (in shares)	1,422
Stock based compensation		38	6		44
Cash dividends			(3,264)		(3,264)
Balance at Jun. 30, 2018	$ 5,100	564	345,647	(11,744)	339,567
Balances (in shares) at Jun. 30, 2018	26,108,045
Net income			10,701		10,701
Other comprehensive income (loss)				425	426
Stock based compensation (in shares)	9,000
Stock based compensation	$ 2	276	32		310
Cash dividends			(3,264)		(3,264)
Balance at Sep. 30, 2018	$ 5,102	840	353,116	(11,319)	347,739
Balances (in shares) at Sep. 30, 2018	26,117,045
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 (loss)				164	164
Stock based compensation (in shares)	6,647
Stock based compensation	$ 1	(81)	35		(45)
Cash dividends			(3,526)		(3,526)
Balance at Mar. 31, 2019	$ 5,103	2,458	312,645	(23,259)	296,947
Balances (in shares) at Mar. 31, 2019	26,123,692
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					27,477
Other comprehensive income (loss)					(146)
Balance at Sep. 30, 2019	$ 5,106	2,895	325,880	(23,569)	310,312
Balances (in shares) at Sep. 30, 2019	26,133,393
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 (loss)				961	961
Stock based compensation (in shares)	701
Stock based compensation	$ 1	485	2		488
Cash dividends			(3,527)		(3,527)
Balance at Jun. 30, 2019	$ 5,104	2,943	319,600	(22,298)	305,349
Balances (in shares) at Jun. 30, 2019	26,124,393
Net income			9,775		9,775
Other comprehensive income (loss)				(1,271)	(1,271)
Stock based compensation (in shares)	9,000
Stock based compensation	$ 2	(48)	33		(13)
Cash dividends			(3,528)		(3,528)
Balance at Sep. 30, 2019	$ 5,106	$ 2,895	$ 325,880	$ (23,569)	$ 310,312
Balances (in shares) at Sep. 30, 2019	26,133,393

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