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Consolidated Statements of Changes in Stockholders' Equity (Parenthetical) - $ / shares | 12 Months Ended
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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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