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Consolidated Statements of Changes in Shareholders' Equity (Parenthetical) - $ / shares
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Statement of Stockholders' Equity [Abstract]      
Issuance of restricted stock, stock incentive plan, shares 13,196 14,363 14,009
Stock options exercised, shares 0 0 927
Issuance of common stock, dividend investment plan, shares 23,180 32,340 31,904
Issuance of common stock, employee benefit plan, shares 3,326 8,030 8,893
Stock Repurchased During Period, Shares 89,607 0 0
Dividends declared, per share (in USD per share) $ 0.82 $ 0.8 $ 0.77