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Consolidated Statements of Changes in Shareholders' Equity (Unaudited) (Parenthetical) - $ / shares
9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Statement of Stockholders' Equity [Abstract]    
Cash dividends on common stock, per share (in usd per share) $ 0.105 $ 0.09
Issuance of common stock dividend reinvestment plan, shares (in shares) 2,389 3,192
Issuance of common stock incentive plan, shares (in shares) 13,264 7,224