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CONSOLIDATED STATEMENTS OF CHANGES IN SHAREHOLERS' EQUITY (Parenthetical) - $ / shares	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Cash dividends declared, per share (in USD per share)	$ 0.82	$ 0.77	$ 0.73
Retained Earnings
Cash dividends declared, per share (in USD per share)	$ 0.82	$ 0.77	$ 0.73
Treasury stock issued (in shares)	58,906	102,649	80,862
Common Stock
Common stock issued in acquisition (in shares)			4,933,115

X

- Definition

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

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.3-04)
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Number of shares of stock issued during the period pursuant to acquisitions.

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+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
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