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Share-Based Compensation - Summary of Stock Option Activity (Details) | 3 Months Ended
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Mar. 31, 2018 $ / shares shares
Options outstanding and exercisable |
Options outstanding and exercisable Beginning Balance, Shares | shares | 63,773
Exercised, Shares | shares | (5,084)
Option outstanding and exercisable Ending Balance, Shares | shares | 58,689
Weighted-Average Exercise Price |
Options outstanding and exercisable Beginning Balance, Weighted-Average Exercise Price | $ / shares | $ 16.62
Exercised, Weighted-Average Exercise Price | $ / shares | 16.62
Options outstanding and exercisable Ending Balance, Weighted-Average Exercise Price | $ / shares | $ 16.62

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