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Consolidated Statements of Changes in Shareholders' Equity (Parenthetical) - $ / shares
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Cash dividends on common stock, per share $ 0.12 $ 0.10
Issuance of common stock dividend reinvestment plan, shares 3,949 4,109
Issuance of common stock incentive plan, shares 9,324 7,582
Repurchase of common stock, stock incentive plan, shares   138
Common Stock [Member]    
Cash dividends on common stock, per share $ 0.12 $ 0.10
Issuance of common stock dividend reinvestment plan, shares 3,949 4,109
Issuance of common stock incentive plan, shares 9,324 7,582
Repurchase of common stock, stock incentive plan, shares   138