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Consolidated Statements of Changes to Stockholders Equity (Parenthetical)
 12 Months Ended
Dec. 31, 2017
$ / shares
shares
Dec. 31, 2016
$ / shares
shares
Dec. 31, 2015
$ / shares
shares
Issuance of shares of restricted stock, Shares 32,000 32,300 32,000
Cash dividends declared, per share | $ / shares $ 0.50 $ 0.46 $ 0.44
Common Stock [Member]      
Issuance of shares of restricted stock, Shares 32,000 32,300 32,000
Issuance of shares of restricted stock, forfeitures 1,080 1,546 200
Issuance of shares of restricted stock, Repurchases   72 38