Consolidated Balance Sheets (Unaudited) (Parenthetical) - USD ($) $ in Thousands	Jun. 30, 2015	Dec. 31, 2014
Statement of Financial Position [Abstract]
Held-to-maturity, market value	$ 26,251	$ 28,400
Available-for-sale, amortized cost	$ 329,655	$ 347,520
Common stock, par value	$ 2.00	$ 2.00
Common stock, shares authorized	15,000,000	15,000,000
Common stock, shares issued	7,610,250	7,571,968
Net unrealized losses on available-for-sale securities, income taxes	$ 448	$ 421