Consolidated Statements of Changes to Stockholder's Equity - USD ($) $ in Thousands	Total	Common Stock [Member]	Treasury Stock [Member]	Retained Earnings [Member]	Accumulated Other Comprehensive Income (Loss) [Member]
Beginning balance at Dec. 31, 2015	$ 120,097	$ 12,086	$ (12,389)	$ 120,188	$ 212
Beginning balance, shares at Dec. 31, 2015		9,225,068
Net income	11,664			11,664
Other comprehensive income (loss)	(2,184)				(2,184)
Purchase of Treasury stock	(194)		(194)
Purchase of Treasury stock, shares		(14,000)
Issuance of 32,300, 32,000 and 33,000 shares of restricted stock (Net of Forfeitures - 1,546, 1,080 and 2,620) for the period ended 2016, 2017 and 2018 respectively and Repurchases - 72 for the period ended 2016, Amount	(47)	$ (541)	316	178
Issuance of 32,300, 32,000 and 33,000 shares of restricted stock (Net of Forfeitures - 1,546 , 1,080 and 2,620) for the period ended 2016, 2017 and 2018 respectively, and Repurchases - 72 for the period ended 2016, Shares		30,682
Stock-based compensation expense	402	$ 402
Cash dividends declared - 0.46, 0.50 and 0.56 per share for the period ended 2016, 2017 and 2018 respectively	(4,161)			(4,161)
Ending balance at Dec. 31, 2016	125,577	$ 11,947	(12,267)	127,869	(1,972)
Ending balance, shares at Dec. 31, 2016		9,241,750
Net income	12,720			12,720
Other comprehensive income (loss)	146				146
Purchase of Treasury stock	(196)		(196)
Purchase of Treasury stock, shares		(6,790)
Issuance of 32,300, 32,000 and 33,000 shares of restricted stock (Net of Forfeitures - 1,546, 1,080 and 2,620) for the period ended 2016, 2017 and 2018 respectively and Repurchases - 72 for the period ended 2016, Amount	(35)	$ (908)	303	570
Issuance of 32,300, 32,000 and 33,000 shares of restricted stock (Net of Forfeitures - 1,546 , 1,080 and 2,620) for the period ended 2016, 2017 and 2018 respectively, and Repurchases - 72 for the period ended 2016, Shares		30,920
Stock-based compensation expense	507	$ 507
Cash dividends declared - 0.46, 0.50 and 0.56 per share for the period ended 2016, 2017 and 2018 respectively	(4,582)			(4,582)
Ending balance at Dec. 31, 2017	134,137	$ 11,546	(12,160)	136,577	(1,826)
Ending balance, shares at Dec. 31, 2017		9,265,880
Adoption of ASU 2017-08, cumulative effect | ASU 2017-08 [Member]	(30)			(30)
Ending balance, adjusted	134,107	$ 11,546	(12,160)	136,547	(1,826)
Net income	14,949			14,949
Other comprehensive income (loss)	(829)				(829)
Adoption of ASU 2018-02 | ASU 2018-02 [Member]				359	(359)
Purchase of Treasury stock	(490)		(490)
Purchase of Treasury stock, shares		(10,999)
Issuance of 32,300, 32,000 and 33,000 shares of restricted stock (Net of Forfeitures - 1,546, 1,080 and 2,620) for the period ended 2016, 2017 and 2018 respectively and Repurchases - 72 for the period ended 2016, Amount	(53)	$ (1,468)	241	1,174
Issuance of 32,300, 32,000 and 33,000 shares of restricted stock (Net of Forfeitures - 1,546 , 1,080 and 2,620) for the period ended 2016, 2017 and 2018 respectively, and Repurchases - 72 for the period ended 2016, Shares		30,380
Stock-based compensation expense	745	$ 745
Cash dividends declared - 0.46, 0.50 and 0.56 per share for the period ended 2016, 2017 and 2018 respectively	(5,142)			(5,142)
Ending balance at Dec. 31, 2018	$ 143,287	$ 10,823	$ (12,409)	$ 147,887	$ (3,014)
Ending balance, shares at Dec. 31, 2018		9,285,261