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Consolidated Statements of Changes to Stockholders Equity (Parenthetical) - $ / shares
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Issuance of shares of restricted stock, Shares 16,150 16,000 13,250
Cash dividends declared, per share $ 0.91 $ 0.87 $ 0.84
Common Stock [Member]      
Issuance of shares of restricted stock, Shares 16,150 16,000 13,250
Issuance of shares of restricted stock, forfeitures 773 100 780
Issuance of shares of restricted stock, Repurchases 36 19