CONSOLIDATED STATEMENTS OF CHANGES IN SHAREHOLDERS' EQUITY - USD ($) $ in Thousands	Total	Impact of adoption of ASC 326	Common Stock	Additional Paid-in Capital	Retained Earnings	Retained Earnings Impact of adoption of ASC 326	Treasury Stock	Accumulated Other Comprehensive Income
Beginning balance at Dec. 31, 2018	$ 244,583		$ 12,835	$ 185,174	$ 80,088		$ (24,352)	$ (9,162)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net earnings	26,279				26,279
Other comprehensive income (loss)	7,369							7,369
10% stock dividend	0
Exercise of stock options	925		39	886
Restricted stock grants			31	(31)
Purchase of treasury stock	(10,140)						10,140
Stock based compensation	663			663
Dividends: Common Stock	(8,128)				8,128
Ending balance at Dec. 31, 2019	261,551		12,905	186,692	98,239		(34,492)	(1,793)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net earnings	27,402				27,402
Other comprehensive income (loss)	11,422							11,422
10% stock dividend	0
Exercise of stock options	638		27	611
Restricted stock grants			20	(20)
Purchase of treasury stock	(16,927)						16,927
Stock based compensation	749			749
Dividends: Common Stock	(8,599)				8,599
Ending balance at Dec. 31, 2020	272,643	$ (3,593)	12,952	188,032	113,449	$ (3,593)	(51,419)	9,629
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net earnings	39,806				39,806
Other comprehensive income (loss)	(3,324)							(3,324)
10% stock dividend	35,947		1,094	34,853	(35,947)
Exercise of stock options	2,019		90	1,929
Restricted stock grants			3	(3)
Stock based compensation	733			733
Dividends: Common Stock	(9,663)				9,663
Ending balance at Dec. 31, 2021	$ 302,214		$ 14,139	$ 225,544	$ 107,645		$ (51,419)	$ 6,305