Consolidated Statements of Changes in Stockholders' Equity (Unaudited) - USD ($) $ in Thousands	Common Stock [Member]	Retained Earnings [Member]	AOCI Attributable to Parent [Member]	Total
Balances at Dec. 31, 2015	$ 8,698	$ 171,353	$ (7,937)	$ 172,114
Net income		11,472		11,472
Dividends		(3,827)		(3,827)
Other comprehensive income (loss), net of tax			4,385	4,385
Balances at Sep. 30, 2016	8,698	178,998	(3,552)	184,144
Balances at Dec. 31, 2016	8,698	178,224	(8,659)	178,263
Net income		11,004		11,004
Dividends		(3,897)		(3,897)
Other comprehensive income (loss), net of tax			2,291	2,291
Balances at Sep. 30, 2017	$ 8,698	$ 185,331	$ (6,368)	$ 187,661