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Condensed Consolidated Statements of Changes in Stockholders' Equity (Unaudited) (Parenthetical) - $ / shares	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Statement Of Stockholders Equity [Abstract]
Cash dividends declared per common share	$ 0.40	$ 0.36	$ 0.40	$ 0.36
Issuance of common shares pursuant to the Dividend Reinvestment Plan (in shares)	13,804	13,475	13,804	13,475
Stock issued during period, shares, deferred compensation	8,163	7,398	8,163	7,398
Restricted stock issued during period, shares, pursuant to the 2017 stock incentive plan			25,200	25,950
Stock issued during period, shares, employee stock purchase plans	3,739	2,858	7,543	2,858

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- Definition

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

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