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CONSOLIDATED STATEMENTS OF CHANGES IN SHAREHOLDERS' EQUITY (Parenthetical) - $ / shares	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Statement of Stockholders' Equity [Abstract]
Cash dividends (in dollars per share)	$ 2.02	$ 1.94	$ 1.82
Net exercise of stock options (in shares)	18,053	10,786	22,277
Shares issued for dividend reinvestment plan (in shares)			34,750
Common stock repurchased and returned to unissued status (in shares)	376,021	32,483
Shares issued for employee stock ownership plan (in shares)		38,883	27,412
Directors deferred compensation plan (in shares)	1,729	1,422	2,808
Restricted stock activity (in shares)	24,180	29,577	45,269

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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 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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