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Consolidated Statements of Changes in Shareholders' Equity (Parenthetical) - $ / shares | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Retained Earnings |  |  |
Cash dividends declared on common shares, per share | $ 1.1247 | $ 0.6808 | $ 0.6862
Serial Preferred Stock |  |  |
Preference Shares authorized | 20,000,000.0 | 20,000,000.0 | 20,000,000.0
Preference Shares issued | 0 | 0 | 0
Preferred Shares outstanding | 0 | 0 | 0
Voting Preferred Stock |  |  |
Preference Shares authorized | 5,000,000 | 5,000,000 | 5,000,000
Preference Shares issued | 0 | 0 | 0

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