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Benefit Plans - Share Option Activity (Details) - Share Options [Member] - $ / shares | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward] |  |
Number of shares outstanding, beginning (in shares) | 134,790 | 406,241
Number of shares exercised (in shares) | (16,390) | (271,451)
Number of shares outstanding, ending (in shares) | 118,400 | 134,790
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Abstract] |  |
Price per share outstanding, beginning (usd per share) | $ 7.39 | $ 6.78
Price per share exercised (usd per share) | 6.99 | 6.48
Price per share outstanding, ending (usd per share) | $ 7.44 | $ 7.39

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