Consolidated Statements of Changes In Stockholders' Equity - USD ($) $ in Thousands		Total	Cumulative Effect, Period of Adoption, Adjustment	Cumulative Effect, Period of Adoption, Adjusted Balance	Common Stock	Common Stock Cumulative Effect, Period of Adoption, Adjusted Balance	Additional Paid-In Capital	Additional Paid-In Capital Cumulative Effect, Period of Adoption, Adjusted Balance	Retained Earnings	Retained Earnings Cumulative Effect, Period of Adoption, Adjustment	Retained Earnings Cumulative Effect, Period of Adoption, Adjusted Balance	Accumulated Other Comprehensive Loss	Accumulated Other Comprehensive Loss Cumulative Effect, Period of Adoption, Adjusted Balance	Treasury Stock	Treasury Stock Cumulative Effect, Period of Adoption, Adjusted Balance
Stockholders' equity, beginning balance at Dec. 31, 2020		$ 334,392	$ 120	$ 334,512	$ 20,194	$ 20,194	$ 353,662	$ 353,662	$ 41,899	$ 120	$ 42,019	$ (816)	$ (816)	$ (80,547)	$ (80,547)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net Income		39,548							39,548
Other Comprehensive Income (Loss)		(2,903)										(2,903)
Stock Dividend		0			606		20,896		(21,502)
Cash Dividends Paid	[1]	(12,129)							(12,129)
Stock Options Exercised, Net		1,453					983							470
Shares Issued Under the Directors' Stock Plan		284					208							76
Shares Issued Under the Employee Stock Purchase Plan		363					262							101
Shares Issued for Dividend Reinvestment Plans		1,366					1,028							338
Stock-Based Compensation Expense		310					310
Purchases of Treasury Stock		(2,633)												(2,633)
Stockholders' equity, ending balance at Sep. 30, 2021		360,171			20,800		377,349		47,936			(3,719)		(82,195)
Stockholders' equity, beginning balance at Jun. 30, 2021		353,033			20,194		355,195		60,494			(2,658)		(80,192)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net Income		12,989
Other Comprehensive Income (Loss)		(1,061)										(1,061)
Stock Dividend		0			606		20,896		(21,502)
Cash Dividends Paid	[1]	(4,045)							(4,045)
Stock Options Exercised, Net		928					657							271
Shares Issued Under the Directors' Stock Plan		95					71							24
Shares Issued Under the Employee Stock Purchase Plan		117					87							30
Shares Issued for Dividend Reinvestment Plans		455					340							115
Stock-Based Compensation Expense		103					103
Purchases of Treasury Stock		(2,443)												(2,443)
Stockholders' equity, ending balance at Sep. 30, 2021		360,171			20,800		377,349		47,936			(3,719)		(82,195)
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		36,712							36,712
Other Comprehensive Income (Loss)		(49,417)										(49,417)
Stock Dividend		0			624		19,408		(20,032)
Cash Dividends Paid	[1]	(12,980)							(12,980)
Stock Options Exercised, Net		366					215							151
Shares Issued Under the Directors' Stock Plan		285					210							75
Shares Issued Under the Employee Stock Purchase Plan		361					261							100
Shares Issued for Dividend Reinvestment Plans		1,420					1,033							387
Stock-Based Compensation Expense		338					338
Purchases of Treasury Stock		(2,721)												(2,721)
Stockholders' equity, ending balance at Sep. 30, 2022		345,550			21,424		399,461		57,778			(49,070)		(84,043)
Stockholders' equity, beginning balance at Jun. 30, 2022		356,498			20,800		379,423		69,980			(29,564)		(84,141)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net Income		12,163							12,163
Other Comprehensive Income (Loss)		(19,506)										(19,506)
Stock Dividend		0			624		19,408		(20,032)
Cash Dividends Paid	[1]	(4,333)							(4,333)
Stock Options Exercised, Net		40					27							13
Shares Issued Under the Directors' Stock Plan		92					67							25
Shares Issued Under the Employee Stock Purchase Plan		119					85							34
Shares Issued for Dividend Reinvestment Plans		471					337							134
Stock-Based Compensation Expense		114					114
Purchases of Treasury Stock		(108)												(108)
Stockholders' equity, ending balance at Sep. 30, 2022		$ 345,550			$ 21,424		$ 399,461		$ 57,778			$ (49,070)		$ (84,043)

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