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		26,559							26,559
Other Comprehensive Income (Loss)		(1,842)										(1,842)
Cash Dividends Paid	[1]	(8,084)							(8,084)
Stock Options Exercised, Net		525					326							199
Shares Issued Under the Directors' Stock Plan		189					137							52
Shares Issued Under the Employee Stock Purchase Plan		246					175							71
Shares Issued for Dividend Reinvestment Plans		911					688							223
Stock-Based Compensation Expense		207					207
Purchases of Treasury Stock		(190)												(190)
Stockholders' equity, ending balance at Jun. 30, 2021		353,033			20,194		355,195		60,494			(2,658)		(80,192)
Stockholders' equity, beginning balance at Mar. 31, 2021		342,413			20,194		354,358		51,263			(3,096)		(80,306)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net Income		13,279
Other Comprehensive Income (Loss)		438										438
Cash Dividends Paid	[1]	(4,048)							(4,048)
Stock Options Exercised, Net		369					232							137
Shares Issued Under the Directors' Stock Plan		91					67							24
Shares Issued Under the Employee Stock Purchase Plan		122					89							33
Shares Issued for Dividend Reinvestment Plans		456					346							110
Stock-Based Compensation Expense		103					103
Purchases of Treasury Stock		(190)												(190)
Stockholders' equity, ending balance at Jun. 30, 2021		353,033			20,194		355,195		60,494			(2,658)		(80,192)
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		(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							11,974
Other Comprehensive Income (Loss)		(8,767)										(8,767)
Cash Dividends Paid		(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)

[1] Cash dividends paid per share have been adjusted for the September 24, 2021 3% stock dividend.