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] 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]
Balance Beginning (in shares) at Dec. 31, 2018						13,295,276
Balance beginning at Dec. 31, 2018	$ 218,985					$ 141,170	$ 94,547	$ (12,013)	$ (4,719)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	9,355		$ 9,355
Other comprehensive income, net of taxes	4,666				$ 4,666
Dividend Reinvestment and Stock Purchase Plan (in shares)		12,859
Dividend Reinvestment and Stock Purchase Plan	218	$ 218
Compensation expense relating to restricted stock (in shares)		12,504
APIC, Share-based Payment Arrangement, Restricted Stock Unit, Increase for Cost Recognition	91	$ 91
Common stock dividends, $0.34 per share	(4,502)		(4,502)
Treasury shares purchased (in shares)		(342,085)
Treasury shares purchased	(5,841)
Balance Ending (in shares) at Jun. 30, 2019		12,978,554
Balance ending at Jun. 30, 2019	222,972	$ 141,479	99,400	$ (17,854)	(53)				(53)
Balance Beginning (in shares) at Mar. 31, 2019						13,314,148
Balance beginning at Mar. 31, 2019	224,018					$ 141,349	$ 96,912	$ (12,013)	(2,230)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	4,728		4,728
Other comprehensive income, net of taxes	2,177				2,177
Dividend Reinvestment and Stock Purchase Plan (in shares)		6,491
Dividend Reinvestment and Stock Purchase Plan	109	$ 109
Compensation expense relating to restricted stock (in shares)		0
APIC, Share-based Payment Arrangement, Restricted Stock Unit, Increase for Cost Recognition	21	$ 21
Common stock dividends, $0.34 per share	(2,240)		(2,240)
Treasury shares purchased (in shares)		(342,085)
Treasury shares purchased	(5,841)
Balance Ending (in shares) at Jun. 30, 2019		12,978,554
Balance ending at Jun. 30, 2019	$ 222,972	$ 141,479	99,400	(17,854)	(53)				(53)
Balance Beginning (in shares) at Dec. 31, 2019	12,936,783	12,936,783
Balance beginning at Dec. 31, 2019	$ 228,048	$ 141,791	104,431	(18,847)	673				673
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	10,083		10,083
Other comprehensive income, net of taxes	3,195				3,195
Dividend Reinvestment and Stock Purchase Plan (in shares)		13,842
Dividend Reinvestment and Stock Purchase Plan	208	$ 208
Exercise of stock options (in shares)		9,593
Exercise of stock options	115	$ 115
Compensation expense relating to restricted stock (in shares)		15,661
APIC, Share-based Payment Arrangement, Restricted Stock Unit, Increase for Cost Recognition	67	$ 67
Common stock dividends, $0.34 per share	$ (4,669)		(4,669)
Balance Ending (in shares) at Jun. 30, 2020	12,975,879	12,975,879
Balance ending at Jun. 30, 2020	$ 237,047	$ 142,181	109,845	(18,847)	3,868
Balance Beginning (in shares) at Mar. 31, 2020		12,969,076
Balance beginning at Mar. 31, 2020	233,478	$ 142,046	107,123	(18,847)	3,156				$ 3,156
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	5,057		5,057
Other comprehensive income, net of taxes	712				712
Dividend Reinvestment and Stock Purchase Plan (in shares)		6,803
Dividend Reinvestment and Stock Purchase Plan	101	$ 101
Compensation expense relating to restricted stock (in shares)		0
APIC, Share-based Payment Arrangement, Restricted Stock Unit, Increase for Cost Recognition	34	$ 34
Common stock dividends, $0.34 per share	$ (2,335)		(2,335)
Balance Ending (in shares) at Jun. 30, 2020	12,975,879	12,975,879
Balance ending at Jun. 30, 2020	$ 237,047	$ 142,181	$ 109,845	$ (18,847)	$ 3,868