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Consolidated Statements of Changes in Shareholders' Equity (Parenthetical) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Statement of Stockholders' Equity [Abstract]      
Cash dividends per share (in usd per share) $ 0.51 $ 0.42 $ 0.35
Shares of common stock issued for acquisition (in shares) 1,052,635 0 0
Issuance of stock including compensation expense (in shares) 38,764 4,421 22,956
Issuance of stock, compensation expense $ 1,483 $ 1,386 $ 958
Issuance of treasury stock, shares 8,214 56,885 25,834
Issuance of stock through dividend reinvestment plan (in shares) 0 0 0
Acquisition of treasury stock (in shares) 0 0 35,648