Consolidated Statements of Changes In Stockholders' Equity (Parenthetical) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Statement of Stockholders' Equity [Abstract]
Stock dividends (in shares)	588,025	570,884	588,025	570,884
Cash Dividends Paid, per Share (in dollars per share)	$ 0.252	$ 0.245	$ 0.757	$ 0.735
Stock Options Exercised (in shares)	8,884	14,063	26,039	76,775
Shares Issued Under the Directors' Stock Plan (in shares)			4,245	3,997
Shares Issued Under Employee Stock Purchase Plan (in shares)	4,739	3,455	13,697	11,403
Shares Issued for Dividend Reinvestment Plans (in shares)	16,443	12,380	48,473	39,078
Purchase of Treasury Stock (in shares)	2,236	10,151	52,257	70,711
Stock dividend, percent	300.00%	300.00%	300.00%	300.00%
Stock Dividend	$ 0	$ 0	$ 0	$ 0