CONSOLIDATED CONDENSED STATEMENTS OF SHAREHOLDERS' EQUITY - USD ($) $ in Thousands	Total	Common Stock [Member]	Retained Earnings [Member]	Treasury Shares [Member]	Accumulated Other Comprehensive Income [Member]	Calculated under Revenue Guidance in Effect before Topic 606 [Member]	Calculated under Revenue Guidance in Effect before Topic 606 [Member] Common Stock [Member]	Calculated under Revenue Guidance in Effect before Topic 606 [Member] Retained Earnings [Member]	Calculated under Revenue Guidance in Effect before Topic 606 [Member] Treasury Shares [Member]	Calculated under Revenue Guidance in Effect before Topic 606 [Member] Accumulated Other Comprehensive Income [Member]	Difference between Revenue Guidance in Effect before and after Topic 606 [Member]	Difference between Revenue Guidance in Effect before and after Topic 606 [Member] Retained Earnings [Member]	Difference between Revenue Guidance in Effect before and after Topic 606 [Member] Accumulated Other Comprehensive Income [Member]
Balance Beginning (in shares) at Dec. 31, 2016		9,998,025
Balance beginning at Dec. 31, 2016	$ 142,944	$ 76,490	$ 80,736	$ (11,665)	$ (2,617)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	3,246		3,246
Other comprehensive income, net of taxes	528				528
Dividend Reinvestment and Stock Purchase Plan (in shares)		4,192
Dividend Reinvestment and Stock Purchase Plan	93	$ 93
Exercise of stock options (in shares)		3,398
Exercise of stock options	51	$ 51
Compensation expense relating to stock options	1	$ 1
Stock Issued During Period, Shares, Restricted Stock Award, Gross		4,027
Compensation expense relating to restricted stock	56	$ 56
Common stock dividends, $0.16 per share	(1,601)		(1,601)
Balance Ending (in shares) at Mar. 31, 2017		10,009,642
Balance ending at Mar. 31, 2017	145,318	$ 76,691	82,381	(11,665)	(2,089)
Balance Beginning (in shares) at Dec. 31, 2017		10,023,059					10,023,059
Balance beginning at Dec. 31, 2017	150,271	$ 76,977	87,826	(11,665)	(2,867)	$ 150,271	$ 76,977	$ 87,301	$ (11,665)	$ (2,342)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	2,713		2,713
Other comprehensive income, net of taxes	(2,976)				(2,976)
Dividend Reinvestment and Stock Purchase Plan (in shares)		4,828
Dividend Reinvestment and Stock Purchase Plan	93	$ 93
Exercise of stock options (in shares)		2,631
Exercise of stock options	33	$ 33
Stock Issued During Period, Shares, Restricted Stock Award, Gross		10,634
Compensation expense relating to restricted stock	56	$ 56
Common stock dividends, $0.16 per share	(1,606)		(1,606)
Changes In Accounting Principles, Reclassification To Retained Earnngs From AOCI | Accounting Standards Update 2014-09 [Member]											$ (525)	$ 525	$ (525)
Balance Ending (in shares) at Mar. 31, 2018		10,041,152
Balance ending at Mar. 31, 2018	$ 148,584	$ 77,159	$ 88,933	$ (11,665)	$ (5,843)