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Consolidated Statements of Changes in Shareholders' Equity (Unaudited) (Parenthetical) - $ / shares | 6 Months Ended
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Jun. 30, 2018 | Jun. 30, 2017
Dividends declared per share (in dollars per share) | $ 0.47 | $ 0.40
Retained Earnings |  |
Dividends declared per share (in dollars per share) | $ 0.47 | $ 0.40
Treasury stock issued for restricted awards, net of forfeitures (in shares) | 75,608 | 89,351
Forfeitures of restricted stock (in shares) | 37,592 | 22,094

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