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CONSOLIDATED STATEMENTS OF CHANGES IN SHAREHOLDERS' EQUITY (Parenthetical) - $ / shares
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Shares outstanding 18,619,634    
Cash dividends declared on common stock, per share $ 0.20 $ 0.20 $ 0.20
Common stock options exercised and related tax benefits, shares 23,148    
Issuance of shares for Employee Stock Purchase Plan, shares 29,273 25,404 32,190
Shares outstanding 19,337,662 18,619,634  
Common Stock [Member]      
Shares outstanding 18,619,634 17,257,995 16,068,119
Restricted stock units issued, shares 90,771 74,936  
Restricted stock awards forfeitures, shares (94,034) (479) (12,133)
Restricted stock repurchased on vesting to pay taxes, shares (45,404) (58,598) (29,088)
Common stock options exercised and related tax benefits, shares 23,148 50,473 70,632
Common stock options exercised, used to exercise, shares 2,374 8,764 9,723
Common stock options exercised, net of shares used to exercise, shares 20,774 41,709 60,909
Sales of shares (Dividend Reinvestment Program), shares 542,302 1,204,710 1,137,998
Issuance of shares for Employee Stock Purchase Plan, shares 29,273 25,404 32,190
Issuance of shares for Employee's Savings and Investment plan, shares 34,449 30,123  
Issuance of common stock for acquisition, shares 139,897 43,834  
Shares outstanding 19,337,662 18,619,634 17,257,995