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Consolidated Statements of Changes in Shareholders' Equity (Parenthetical) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Statement of Stockholders' Equity [Abstract]      
Cash dividends per share (in usd per share) $ 0.42 $ 0.35 $ 0.22
Issuance of stock including compensation expense (in shares) 4,421 22,956 50,686
Issuance of stock, compensation expense $ 1,386 $ 958 $ 740
Issuance of treasury stock, shares 56,885 25,834 0
Issuance of stock through dividend reinvestment plan (in shares) 0 0 5,239
Acquisition of treasury stock (in shares) 0 35,648 47,077