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Consolidated Statements of Changes in Stockholders' Equity (Parenthetical) - $ / shares	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Statement of Stockholders' Equity [Abstract]
Purchase and retirement of common stock (shares)	719,573	1,063,557
Cash dividends declared on common stock (usd per share)	$ 0.28	$ 0.21
Stock options exercised (in shares)	1,752,156	198,026

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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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