CONSOLIDATED BALANCE SHEETS (Parenthetical) (USD $) In Thousands, except Share data, unless otherwise specified	Mar. 31, 2014	Dec. 31, 2013	Mar. 31, 2013
Securities, fair value	$ 587,100	$ 527,735	$ 565,708
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	15,363,728	15,333,622	15,228,277
Common stock, shares outstanding	15,363,728	15,333,622	15,228,277
Accumulated other comprehensive income, tax	$ 2,486	$ 2,103	$ 3,169
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