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Condensed Consolidated Statements of Stockholders' Equity (Parenthetical) - $ / shares | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2019 | Mar. 31, 2018 | Dec. 31, 2018
Statement of Stockholders' Equity [Abstract] |  |  |
Cash dividends declared per common share (in dollars per share) | $ 0.22 | $ 0.21 | $ 0.66
Common stock issued per share for stock bonus (in USD per share) | $ 54.31 | $ 57.41 | $ 57.41

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- Definition The amount of each share issued during the period as a result of share-based compensation plans other than an employee stock ownership plan (ESOP). + References No definition available. + Details
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- Definition Aggregate dividends declared during the period for each share of common stock outstanding. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770 + Details
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- References No definition available. + Details
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