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Consolidated Statements of Changes to Stockholder's Equity (Parenthetical) - $ / shares | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Issuance of shares of restricted stock, Shares | 33,000 | 32,000 | 32,300
Cash dividends declared, per share | $ 0.56 | $ 0.50 | $ 0.46
Common Stock [Member] |  |  |
Issuance of shares of restricted stock, Shares | 33,000 | 32,000 | 32,300
Issuance of shares of restricted stock, forfeitures | 2,620 | 1,080 | 1,546
Issuance of shares of restricted stock, Repurchases |  |  | 72

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