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Consolidated Statements of Changes in Shareholders’ Equity (Unaudited) (Parenthetical) - USD ($)
$ in Thousands
9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Statement of Stockholders' Equity [Abstract]    
Cash dividends per share (in usd per share) $ 0.30 $ 0.26
Stock-based compensation plans, issuance of stock, shares 5,418 37,462
Compensation expense, issuance of stock $ 1,048 $ 778
Issuance of treasury stock, shares 56,885 15,334
Acquisition of treasury stock, shares   35,648