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CONSOLIDATED STATEMENTS OF CHANGES IN SHAREHOLDERS' EQUITY (Parenthetical) - $ / shares	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Statement of Stockholders' Equity [Abstract]
Cash dividends (in dollars per share)	$ 2.10	$ 2.02	$ 1.94
Net exercise of stock options (in shares)	3,775	18,053	10,786
Common stock repurchased and returned to unissued status (in shares)	127,690	376,021	32,483
Shares issued for dividend reinvestment plan (in shares)	29,842
Shares issued for employee stock ownership plan (in shares)			38,883
Directors deferred compensation plan (in shares)	893	1,729	1,422
Restricted stock activity (in shares)	43,963	24,180	29,577

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The number of shares issued upon the exercise of stock options during the period, net of tax benefit.

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Aggregate dividends declared during the period for each share of common stock outstanding.

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Number of shares issued during the period from a dividend reinvestment plan (DRIP). A dividend reinvestment plan allows the shareholders to reinvest dividends paid to them by the entity on new issues of stock by the entity.

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Number of shares of capital stock issued (purchased by employees) in connection with an employee stock ownership plan.

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Number of shares issued during the period related to Restricted Stock Awards, net of any shares forfeited.

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Number, after forfeiture, of shares or units issued under share-based payment arrangement. Excludes shares or units issued under employee stock ownership plan (ESOP).

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Number of shares that have been repurchased during the period and have not been retired and are not held in treasury. Some state laws may govern the circumstances under which an entity may acquire its own stock and prescribe the accounting treatment therefore. This element is used when state law does not recognize treasury stock.

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