Consolidated Statements of Changes in Stockholders' Equity (Parenthetical) - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2023		Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Statement of Stockholders' Equity [Abstract]
Stock dividend, percent		300.00%	[1]	300.00%	300.00%
Stock dividends (in shares)		642,567	[1]	623,848	605,670
Cash Dividends Paid (in dollars per share)	[2]	$ 1.06		$ 1.03	$ 0.96
Shares Issued for Stock Option Exercises, net (in shares)		4,564		28,052	54,757
Shares Issued Under Directors Stock Plan (in shares)		9,186		12,933	11,051
Shares Issued Under the Employee Stock Purchase Plan (in shares)		3,872		15,207	14,903
Shares Issued for Dividend Reinvestment Plans (in shares)		17,753		57,745	51,403
Purchase of Treasury Stock (in shares)		140,965		84,132	73,555
Treasury Stock, Shares (in shares)		5,124,073		4,872,355
Cumulative effect of adoption		$ 379,772		$ 353,538	$ 371,186	$ 334,392
Accounting Standards Update [Extensible List]						Accounting Standards Update 2016-13 [Member]

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

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