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Related Party Transactions (Details) - Director [Member] | Mar. 06, 2018 shares | Mar. 01, 2018 director $ / shares
--- | --- | ---
Related Party Transaction [Line Items] |  |
Number of shares sold (in shares) | 21,250 |
Number of directors | director |  | 2
Price per share (in dollars per share) | $ / shares |  | $ 21.70
Steven B. Tucker [Member] |  |
Related Party Transaction [Line Items] |  |
Stock purchased (in shares) | 6,250 |
W. Miller Welborn [Member] |  |
Related Party Transaction [Line Items] |  |
Stock purchased (in shares) | 15,000 |

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