Consolidated Balance Sheet (Parentheticals) (USD $)	Dec. 31, 2011	Dec. 31, 2010
Cost of available for sale securities	$ 1,242,460,000	$ 1,188,807,000
Fair value of held to maturity securities	57,486,000	58,610,000
Common stock, par value	$ 1.00	$ 1.00
Common stock, shares authorized	25,000,000	25,000,000
Common stock, shares issued	16,611,671	16,611,671
Treasury stock shares	126,881	186,616
Preferred Stock [Member]
Preferred stock, par value	$ 1.00	$ 1.00
Preferred stock, shares authorized	20,604	102,302
Preferred stock, shares issued	0	0
Preferred stock, shares outstanding	0	0
Series A Preferred Stock [Member]
Preferred stock, par value	$ 1.00	$ 1.00
Preferred stock, shares authorized	16,000	16,000
Preferred stock, shares issued	0	0
Preferred stock, shares outstanding	0	0
Series B Preferred Stock [Member]
Preferred stock, par value	$ 1.00	$ 1.00
Preferred stock, shares authorized	81,698	81,698
Preferred stock, shares issued	0	81,698
Preferred stock, shares outstanding	0	81,698
Preferred stock, liquidation value	0	81,698,000
Series C Preferred Stock [Member]
Preferred stock, par value	$ 1	$ 0
Preferred stock, shares authorized	81,698	0
Preferred stock, shares issued	81,698	0
Preferred stock, shares outstanding	81,698	0
Preferred stock, liquidation value	$ 81,698,000	$ 0