Consolidated Balance Sheet (Parentheticals) (USD $)	Mar. 31, 2012	Dec. 31, 2011
Cost of available for sale securities	$ 1,135,679,000	$ 1,242,460,000
Fair value of held to maturity securities	57,441,000	57,486,000
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	125,132	126,881
Preferred Stock [Member]
Preferred stock, par value	$ 1.00	$ 1.00
Preferred stock, shares authorized	20,604	20,604
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	0
Preferred stock, shares outstanding	0	0
Preferred stock, liquidation value	0	0
Series C Preferred Stock [Member]
Preferred stock, par value	$ 1	$ 1
Preferred stock, shares authorized	81,698	81,698
Preferred stock, shares issued	81,698	81,698
Preferred stock, shares outstanding	81,698	81,698
Preferred stock, liquidation value	$ 81,698,000	$ 81,698,000