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	14,082		$ 14,082
Other comprehensive income, net of taxes	5,511				$ 5,511
Dividend Reinvestment and Stock Purchase Plan (in shares)		19,683
Dividend Reinvestment and Stock Purchase Plan	336	$ 336
Compensation expense relating to restricted stock (in shares)		12,504
APIC, Share-based Payment Arrangement, Restricted Stock Unit, Increase for Cost Recognition	112	$ 112
Common stock dividends, $0.51 per share	(6,700)		(6,700)
Treasury shares purchased (in shares)		(400,000)
Repurchase of common stock	(6,834)
Balance Ending (in shares) at Sep. 30, 2019		12,927,463
Balance ending at Sep. 30, 2019	225,492	$ 141,618	101,929	$ (18,847)	792				792
Balance Beginning (in shares) at Jun. 30, 2019						12,978,554
Balance beginning at Jun. 30, 2019	222,972					$ 141,479	$ 99,400	$ (17,854)	(53)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	4,727		4,727
Other comprehensive income, net of taxes	845				845
Dividend Reinvestment and Stock Purchase Plan (in shares)		6,824
Dividend Reinvestment and Stock Purchase Plan	118	$ 118
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, $0.51 per share	(2,198)		(2,198)
Treasury shares purchased (in shares)		(57,915)
Repurchase of common stock	(993)
Balance Ending (in shares) at Sep. 30, 2019		12,927,463
Balance ending at Sep. 30, 2019	$ 225,492	$ 141,618	101,929	(18,847)	792				792
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	14,333		14,333
Other comprehensive income, net of taxes	3,481				3,481
Dividend Reinvestment and Stock Purchase Plan (in shares)		20,239
Dividend Reinvestment and Stock Purchase Plan	302	$ 302
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	102	$ 102
Common stock dividends, $0.51 per share	(7,004)		(7,004)
Treasury shares purchased (in shares)		(55,590)
Repurchase of common stock	$ (792)
Balance Ending (in shares) at Sep. 30, 2020	12,926,686	12,926,686
Balance ending at Sep. 30, 2020	$ 238,585	$ 142,310	111,760	(19,639)	4,154
Balance Beginning (in shares) at Jun. 30, 2020		12,975,879
Balance beginning at Jun. 30, 2020	237,047	$ 142,181	109,845	(18,847)	3,868				$ 3,868
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	4,250		4,250
Other comprehensive income, net of taxes	286				286
Dividend Reinvestment and Stock Purchase Plan (in shares)		6,397
Dividend Reinvestment and Stock Purchase Plan	94	$ 94
Compensation expense relating to restricted stock (in shares)		0
APIC, Share-based Payment Arrangement, Restricted Stock Unit, Increase for Cost Recognition	35	$ 35
Common stock dividends, $0.51 per share	(2,335)		(2,335)
Treasury shares purchased (in shares)		(55,590)
Repurchase of common stock	$ (792)
Balance Ending (in shares) at Sep. 30, 2020	12,926,686	12,926,686
Balance ending at Sep. 30, 2020	$ 238,585	$ 142,310	$ 111,760	$ (19,639)	$ 4,154