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 (Loss)
Beginning balance at Dec. 31, 2017	$ 207,345		$ 11,921	$ 155,601	$ 66,037		$ (20,087)	$ (6,127)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net earnings	20,596				20,596
Other comprehensive income (loss)	(2,549)							(2,549)
Reclassification of certain tax effects from accumulated other comprehensive income					486			(486)
Exercise of stock options	327		14	313
Purchase of treasury stock	(4,265)						(4,265)
Sale/Issuance of common stock	29,568		900	28,668
Stock based compensation	592			592
Dividends: Common Stock	(7,031)				(7,031)
Ending 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
Exercise of stock options	925		39	886
Purchase of treasury stock	(10,140)						(10,140)
Restricted stock grants			31	(31)
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
Exercise of stock options	638		27	611
Purchase of treasury stock	(16,927)						(16,927)
Restricted stock grants			20	(20)
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