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Consolidated Statements of Changes to Stockholders' Equity (Parenthetical) - $ / shares
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Issuance of shares of restricted stock, Shares 16,000 13,250 11,000
Cash dividends declared, per share $ 0.87 $ 0.84 $ 0.81
Common Stock [Member]      
Issuance of shares of restricted stock, Shares 16,000 13,250 11,000
Issuance of shares of restricted stock, forfeitures 100 780 620
Issuance of shares of restricted stock, Repurchases 19