Consolidated Balance Sheets (Parenthetical) (USD $) In Thousands, except Share data, unless otherwise specified	Sep. 30, 2014	Dec. 31, 2013	Sep. 30, 2013
Securities, fair value	$ 535,665	$ 527,735	$ 474,755
Common stock, par value	$ 1.00	$ 1.00	$ 1.00
Common stock, shares authorized	20,000,000	20,000,000	20,000,000
Common stock, shares issued	15,449,546	15,333,622	15,298,308
Common stock, shares outstanding	15,449,546	15,333,622	15,298,308
Accumulated other comprehensive income, tax	$ 2,880	$ 2,103	$ 2,083
Senior Preferred Stock [Member]
Preferred stock, par value	$ 1.00	$ 1.00	$ 1.00
Preferred stock, shares authorized	10,000,000	10,000,000	10,000,000
Preferred stock, shares issued	0	0	0
Cumulative Preferred Stock [Member]
Preferred stock, par value	$ 5.00	$ 5.00	$ 5.00
Preferred stock, shares authorized	900,000	900,000	900,000
Preferred stock, shares issued	0	0	0