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Consolidated Statements of Changes in Shareholders' Equity (Parenthetical) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Statement of Stockholders' Equity [Abstract]      
Cash dividends per share (in usd per share) $ 0.35 $ 0.22  
Issuance of stock including compensation expense (in shares) 22,956 50,686 157,207
Issuance of treasury stock (in shares) 25,834    
Issuance of stock, compensation expense $ 958 $ 740 $ 190
Issuance of stock through dividend reinvestment plan (in shares)   5,239 73
Acquisition of treasury stock (in shares) 35,648 47,077