CONSOLIDATED STATEMENTS OF CHANGES IN STOCKHOLDERS' EQUITY - USD ($) $ in Thousands	Common Stock [Member]	Additional Paid-in Capital [Member]	Retained Earnings [Member]	Accumulated Other Comprehensive Income (Loss) [Member]	Total
Balances at Dec. 31, 2016	$ 127	$ 64,201	$ 90,964	$ (993)	$ 154,299
Net income			11,262		11,262
Other comprehensive income				(90)	(90)
Reclass of stranded tax effects from change in tax tax rate			226	(226)
Stock-based compensation		1,055			1,055
Cash dividends declared			(2,790)		(2,790)
Balances at Dec. 31, 2017	127	65,256	99,662	(1,309)	163,736
Net income			24,997		24,997
Other comprehensive income				(1,647)	(1,647)
Exercise of options and vesting of restricted stock, net of shares surrendered		(269)			(269)
Stock-based compensation		447			447
Cash dividends declared			(4,079)		(4,079)
Balances at Dec. 31, 2018	$ 127	$ 65,434	120,574	(2,950)	183,185
Cummulative effect adjustment (ASU 2016-01) | Accounting Standards Update 2016-01 [Member]			$ (6)	$ 6	$ (6)