Consolidated Statements of Changes In Stockholders' Equity - USD ($) $ in Thousands		Total	Common Stock	Additional Paid-In Capital	Retained Earnings	Accumulated Other Comprehensive Loss	Treasury Stock
Stockholders' equity, beginning balance at Dec. 31, 2021		$ 371,186	$ 20,800	$ 377,996	$ 54,078	$ 347	$ (82,035)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net Income		24,549			24,549
Other Comprehensive Income (Loss)		(29,911)				(29,911)
Cash Dividends Paid	[1]	(8,647)			(8,647)
Stock Options Exercised, Net		326		188			138
Shares Issued Under the Directors' Stock Plan		193		143			50
Shares Issued Under the Employee Stock Purchase Plan		242		176			66
Shares Issued for Dividend Reinvestment Plans		949		696			253
Stock-Based Compensation Expense		224		224
Purchases of Treasury Stock		(2,613)					(2,613)
Stockholders' equity, ending balance at Jun. 30, 2022		356,498	20,800	379,423	69,980	(29,564)	(84,141)
Stockholders' equity, beginning balance at Mar. 31, 2022		357,243	20,800	378,758	62,328	(20,797)	(83,846)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net Income		11,974
Other Comprehensive Income (Loss)		(8,767)				(8,767)
Cash Dividends Paid	[1]	(4,322)			(4,322)
Stock Options Exercised, Net		85		53			32
Shares Issued Under the Directors' Stock Plan		94		68			26
Shares Issued Under the Employee Stock Purchase Plan		122		87			35
Shares Issued for Dividend Reinvestment Plans		475		343			132
Stock-Based Compensation Expense		114		114
Purchases of Treasury Stock		(520)					(520)
Stockholders' equity, ending balance at Jun. 30, 2022		356,498	20,800	379,423	69,980	(29,564)	(84,141)
Stockholders' equity, beginning balance at Dec. 31, 2022		353,538	21,424	400,270	65,401	(49,655)	(83,902)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net Income		14,609			14,609
Other Comprehensive Income (Loss)		2,042				2,042
Cash Dividends Paid	[1]	(8,934)			(8,934)
Stock Options Exercised, Net		83		50			33
Shares Issued Under the Directors' Stock Plan		114		85			29
Shares Issued Under the Employee Stock Purchase Plan		120		87			33
Shares Issued for Dividend Reinvestment Plans		472		330			142
Stock-Based Compensation Expense		247		247
Purchases of Treasury Stock		(848)					(848)
Stockholders' equity, ending balance at Jun. 30, 2023		361,443	21,424	401,069	71,076	(47,613)	(84,513)
Stockholders' equity, beginning balance at Mar. 31, 2023		363,371	21,424	400,944	69,499	(43,983)	(84,513)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net Income		6,047			6,047
Other Comprehensive Income (Loss)		(3,630)				(3,630)
Cash Dividends Paid		(4,470)			(4,470)
Stock-Based Compensation Expense		125		125
Stockholders' equity, ending balance at Jun. 30, 2023		$ 361,443	$ 21,424	$ 401,069	$ 71,076	$ (47,613)	$ (84,513)

[1] Cash dividends paid per share have been adjusted for the September 23, 2022 3% stock dividend.