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 Income (Loss)	Accumulated Other Comprehensive Income (Loss) Cumulative Effect, Period of Adoption, Adjusted Balance	Treasury Stock	Treasury Stock Cumulative Effect, Period of Adoption, Adjusted Balance
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		49,857								49,857
Other Comprehensive Income (Loss)		1,163												1,163
Stock Dividend		0	[1]			606		20,896		(21,502)	[1]
Cash Dividends Paid		(16,296)								(16,296)
Shares Issued for Stock Option Exercises, net		1,505						1,016								489
Shares Issued Under the Directors' Stock Plan		376						278								98
Shares Issued Under the Employee Stock Purchase Plan		481						350								131
Shares Issued for Dividend Reinvestment Plans		1,836						1,380								456
Stock-Based Compensation Expense		414						414
Purchases of Treasury Stock		(2,662)														(2,662)
Ending 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		48,799								48,799
Other Comprehensive Income (Loss)		(50,002)												(50,002)
Stock Dividend	[2]	0				624		19,408		(20,032)
Cash Dividends Paid	[1]	(17,444)								(17,444)
Shares Issued for Stock Option Exercises, net		631						384								247
Shares Issued Under the Directors' Stock Plan		408						295								113
Shares Issued Under the Employee Stock Purchase Plan		477						344								133
Shares Issued for Dividend Reinvestment Plans		1,904						1,392								512
Stock-Based Compensation Expense		451						451
Purchases of Treasury Stock		(2,872)														(2,872)
Ending 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		30,075								30,075
Other Comprehensive Income (Loss)		16,239												16,239
Stock Dividend	[2]	0				643		11,058		(11,701)
Cash Dividends Paid	[1]	(17,983)								(17,983)
Shares Issued for Stock Option Exercises, net		96						58								38
Shares Issued Under the Directors' Stock Plan		218						143								75
Shares Issued Under the Employee Stock Purchase Plan		120						87								33
Shares Issued for Dividend Reinvestment Plans		472						330								142
Stock-Based Compensation Expense		605						605
Purchases of Treasury Stock		(3,608)														(3,608)
Ending balance at Dec. 31, 2023		$ 379,772				$ 22,067		$ 412,551		$ 65,792				$ (33,416)		$ (87,222)

[1] Cash dividends paid per share have been adjusted for the September 26, 2023 3% stock dividend.

[2] Included in the shares issued for the 3% stock dividend in 2023 were treasury shares of 146,128.