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	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
Dividends, Common Stock, Cash	(7,004)		(7,004)
Treasury shares purchased (in shares)		(55,590)
Repurchase of common stock	(792)			$ (792)
Balance Ending (in shares) at Sep. 30, 2020		12,926,686
Balance ending at Sep. 30, 2020	$ 238,585	$ 142,310	111,760	(19,639)	4,154				4,154
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Dividends declared per common share (usd per share)	$ 0.54
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
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
Dividends, Common Stock, Cash	(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
Balance ending at Sep. 30, 2020	$ 238,585	$ 142,310	111,760	(19,639)	4,154				4,154
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	15,347		15,347
Other comprehensive income, net of taxes	(3,147)				(3,147)
Dividend Reinvestment and Stock Purchase Plan (in shares)		17,199
Dividend Reinvestment and Stock Purchase Plan	303	$ 303
Exercise of stock options (in shares)		311
Exercise of stock options	4	$ 4
Compensation expense relating to restricted stock (in shares)		25,565
APIC, Share-based Payment Arrangement, Restricted Stock Unit, Increase for Cost Recognition	196	$ 196
Dividends, Common Stock, Cash	(7,238)		(7,238)
Treasury shares purchased (in shares)		(468,072)
Repurchase of common stock	$ (7,871)			(7,871)
Balance Ending (in shares) at Sep. 30, 2021	12,433,328	12,433,328
Balance ending at Sep. 30, 2021	$ 238,419	$ 142,946	123,167	(28,590)	896
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Dividends declared per common share (usd per share)	$ 0.57
Balance Beginning (in shares) at Jun. 30, 2021		12,634,845
Balance beginning at Jun. 30, 2021	$ 239,952	$ 142,791	120,720	(25,122)	1,563				$ 1,563
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	4,817		4,817
Other comprehensive income, net of taxes	(667)				(667)
Dividend Reinvestment and Stock Purchase Plan (in shares)		6,007
Dividend Reinvestment and Stock Purchase Plan	104	$ 104
Compensation expense relating to restricted stock (in shares)		(756)
APIC, Share-based Payment Arrangement, Restricted Stock Unit, Increase for Cost Recognition	51	$ 51
Dividends, Common Stock, Cash	(2,370)		(2,370)
Treasury shares purchased (in shares)		(206,768)
Repurchase of common stock	$ (3,468)
Balance Ending (in shares) at Sep. 30, 2021	12,433,328	12,433,328
Balance ending at Sep. 30, 2021	$ 238,419	$ 142,946	$ 123,167	$ (28,590)	$ 896
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Dividends declared per common share (usd per share)	$ 0.19