Consolidated Statements of Changes In Stockholders' Equity (Parenthetical) - $ / shares	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Statement of Stockholders' Equity [Abstract]
Cash Dividends Paid, per Share (in dollars per share)	$ 0.260	$ 0.252
Stock Options Exercised (in shares)	6,927	14,282
Shares Issued Under the Directors' Stock Plan (in shares)	3,172
Shares Issued Under Employee Stock Purchase Plan (in shares)	4,269	3,648
Shares Issued for Dividend Reinvestment Plans (in shares)	12,649	16,001
Purchase of Treasury Stock (in shares)		50,021