Consolidated Balance Sheet (Unaudited) (Parentheticals) (USD $) In Thousands, except Share data, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012	Mar. 31, 2012
Held to maturity, fair value	$ 247,087	$ 261,131	$ 318,490
Preferred stock, par value	$ 1	$ 1	$ 1
Preferred stock, shares authorized	10,000,000	10,000,000	10,000,000
Common stock, par value	$ 1	$ 1	$ 1
Common stock, shares authorized	100,000,000	100,000,000	100,000,000
Common stock, shares issued	43,063,761	42,423,870	41,688,647
Common stock, shares outstanding	43,063,761	42,423,870	41,688,647
Common stock issuable, shares	133,469	133,238	90,126
Series A Preferred Stock
Preferred stock, par value	$ 10	$ 10	$ 10
Preferred stock, shares issued	21,700	21,700	21,700
Preferred stock, shares outstanding	21,700	21,700	21,700
Series B Preferred Stock
Preferred stock, par value	$ 1,000	$ 1,000	$ 1,000
Preferred stock, shares issued	180,000	180,000	180,000
Preferred stock, shares outstanding	180,000	180,000	180,000
Series D Preferred Stock
Preferred stock, par value	$ 1,000	$ 1,000	$ 1,000
Preferred stock, shares issued	16,613	16,613	16,613
Preferred stock, shares outstanding	16,613	16,613	16,613
Non-Voting Common Stock
Common stock, par value	$ 1	$ 1	$ 1
Common stock, shares authorized	30,000,000	30,000,000	30,000,000
Common stock, shares issued	14,703,636	15,316,794	15,914,209
Common stock, shares outstanding	14,703,636	15,316,794	15,914,209