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, 2019						12,936,783
Balance beginning at Dec. 31, 2019	$ 228,048					$ 141,791	$ 104,431	$ (18,847)	$ 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
Dividends, Common Stock, Cash	(4,669)		(4,669)
Balance Ending (in shares) at Jun. 30, 2020		12,975,879
Balance ending at Jun. 30, 2020	$ 237,047	$ 142,181	109,845	$ (18,847)	3,868				3,868
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Dividends declared per common share (usd per share)	$ 0.36
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
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
Dividends, Common Stock, Cash	(2,335)		(2,335)
Balance Ending (in shares) at Jun. 30, 2020		12,975,879
Balance ending at Jun. 30, 2020	$ 237,047	$ 142,181	109,845	(18,847)	3,868				3,868
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Dividends declared per common share (usd per share)	$ 0.18
Balance Beginning (in shares) at Dec. 31, 2020	12,858,325	12,858,325
Balance beginning at Dec. 31, 2020	$ 240,825	$ 142,443	115,058	(20,719)	4,043				4,043
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	10,530		10,530
Other comprehensive income, net of taxes	(2,480)				(2,480)
Dividend Reinvestment and Stock Purchase Plan (in shares)		11,192
Dividend Reinvestment and Stock Purchase Plan	199	$ 199
Exercise of stock options (in shares)		311
Exercise of stock options	4	$ 4
Compensation expense relating to restricted stock (in shares)		26,321
APIC, Share-based Payment Arrangement, Restricted Stock Unit, Increase for Cost Recognition	145	$ 145
Dividends, Common Stock, Cash	(4,868)		(4,868)
Treasury shares purchased (in shares)		(261,304)
Repurchase of common stock	$ (4,403)			(4,403)
Balance Ending (in shares) at Jun. 30, 2021	12,634,845	12,634,845
Balance ending at Jun. 30, 2021	$ 239,952	$ 142,791	120,720	(25,122)	1,563
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Dividends declared per common share (usd per share)	$ 0.38
Balance Beginning (in shares) at Mar. 31, 2021		12,820,108
Balance beginning at Mar. 31, 2021	$ 239,246	$ 142,639	117,863	(21,859)	603				$ 603
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	5,290		5,290
Other comprehensive income, net of taxes	960				960
Dividend Reinvestment and Stock Purchase Plan (in shares)		5,720
Dividend Reinvestment and Stock Purchase Plan	100	$ 100
Compensation expense relating to restricted stock (in shares)		0
APIC, Share-based Payment Arrangement, Restricted Stock Unit, Increase for Cost Recognition	52	$ 52
Dividends, Common Stock, Cash	(2,433)		(2,433)
Treasury shares purchased (in shares)		(190,983)
Repurchase of common stock	$ (3,263)
Balance Ending (in shares) at Jun. 30, 2021	12,634,845	12,634,845
Balance ending at Jun. 30, 2021	$ 239,952	$ 142,791	$ 120,720	$ (25,122)	$ 1,563
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Dividends declared per common share (usd per share)	$ 0.19