CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Statement of Financial Position [Abstract]
Allowance for loan losses (in dollars)	$ 19,909	$ 18,773
Common stock, stated value per share (usd per share)	$ 0.125	$ 0.125
Common stock, Authorized shares (shares)	40,000,000	40,000,000
Common stock, Issued shares (shares)	14,595,320	14,578,758
Common stock, Outstanding shares (shares)	12,246,464	12,216,712
Treasury stock (shares)	2,348,856	2,362,046