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Consolidated Statements of Changes in Stockholders' Equity (Parenthetical) - $ / shares	9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017
Statement of Stockholders' Equity [Abstract]
Share-based compensation arrangement by share-based payment award, options, exercisable, number (in shares)	0	198,026
Cash dividends declared on common stock (in dollars per share)	$ 0.27	$ 0.20
Repurchase and retirement of common stock (in shares)	752,174	614,673,000

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

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

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Number of shares that have been repurchased and retired during the period.

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