CONSOLIDATED STATEMENT OF CHANGES IN STOCKHOLDERS' EQUITY (UNAUDITED) - 6 months ended Jun. 30, 2018 - USD ($) $ in Thousands	Common Stock [Member]	Retained Earnings [Member]	Accumulated Other Comprehensive Income (Loss) [Member]	Total
Balances at Dec. 31, 2017	$ 110,445	$ 74,983	$ (2,073)	$ 183,355
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	0	9,508	0	9,508
Other comprehensive income (loss)	0	0	(3,921)	(3,921)
Cash dividends paid ($0.27 per share)	0	(3,606)	0	(3,606)
Cash in lieu of fractional share for 5 for 4 stock split	0	(13)	0	(13)
Stock options exercised	101	0	0	101
Stock based compensation expense	181	0	0	181
Balances at Jun. 30, 2018	$ 110,727	$ 80,872	$ (5,994)	$ 185,605