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Consolidated Balance Sheets (Parenthetical) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Assets:    
Securities available-for-sale at amortized cost $ 590,199 $ 608,939
Securities held-to-maturity at fair value 660 867
Core deposit intangible, accumulated amortization $ 8,616 $ 8,483
Shareholders' equity:    
Preferred stock, shares authorized (in shares) 300,000 300,000
Common stock, par value (in dollars per share) $ 5 $ 5
Common stock, shares authorized (in shares) 25,000,000 25,000,000
Common stock, shares outstanding (in shares) 17,692,912 17,628,695