Consolidated Statements Of Changes In Shareholders' Equity (Parenthetical) - $ / shares	9 Months Ended
Sep. 30, 2018	Sep. 30, 2017
Consolidated Statements Of Changes In Shareholders' Equity [Abstract]
Cash dividends per share	$ 0.443	$ 0.368
Stock dividend, rate	5.00%	5.00%
Common stock dividend, shares at fair value	447,700	423,053
Issuance and reissuance of stock:
Shares under the dividend reinvestment and stock purchase plan	12,718	12,655
Shares under the stock option plan	30,535	11,397
Shares of stock-based compensation awards	4,217	7,037
Shares under employee stock purchase plan	5,125	4,844

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Number of shares of common stock issued as dividends during the period. Excludes stock splits.

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The per share amount of a dividend declared, but not paid, as of the financial reporting date.

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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 issued during the period as a result of an employee stock purchase plan.

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Number of shares (or other type of equity) issued during the period as a result of any equity-based compensation plan other than an employee stock ownership plan (ESOP), net of any shares forfeited. Shares issued could result from the issuance of restricted stock, the exercise of stock options, stock issued under employee stock purchase plans, and/or other employee benefit plans.

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Number of share options (or share units) exercised during the current period.

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