Consolidated Statements of Changes in Stockholders' Equity (Unaudited) - USD ($) $ in Thousands	Common Stock [Member]	Retained Earnings [Member]	AOCI Attributable to Parent [Member]	Total
Balance at Dec. 31, 2016	$ 8,698	$ 178,224	$ (8,659)	$ 178,263
Net income		11,004		11,004
Other comprehensive income (loss), net of tax			2,291	2,291
Dividends		(3,897)		(3,897)
Balance at Sep. 30, 2017	8,698	185,331	(6,368)	187,661
Balance at Jun. 30, 2017	8,698	181,546	(5,958)	184,286
Net income		3,785		3,785
Other comprehensive income (loss), net of tax			(410)	(410)
Balance at Sep. 30, 2017	8,698	185,331	(6,368)	187,661
Balance at Dec. 31, 2017	8,698	185,893	(9,695)	184,896
Net income		11,588		11,588
Other comprehensive income (loss), net of tax			(4,291)	(4,291)
Dividends		(4,036)		(4,036)
Balance at Sep. 30, 2018	8,698	193,445	(13,986)	188,157
Balance at Jun. 30, 2018	8,698	189,194	(12,041)	184,851
Net income		4,251		4,251
Other comprehensive income (loss), net of tax			(1,945)	(1,945)
Balance at Sep. 30, 2018	$ 8,698	$ 193,445	$ (13,986)	$ 188,157