Note 25 - Condensed Parent Company Financial Statements (Detail) - Statements of Income (Parent Company Only) (USD $)	3 Months Ended		12 Months Ended
	Dec. 31, 2012	Mar. 31, 2012	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Income
Interest income			$ 300,569,000	$ 321,511,000	$ 328,867,000
Net losses on early extinguishment of debt	(814,000)	256,000	(558,000)
Securities transactions and other			8,393,000	5,345,000	9,573,000
Expenses
Interest expense			34,901,000	39,891,000	49,518,000
Other expenses			24,777,000	23,792,000	22,772,000
(Loss) income before income tax benefit and equity in undistributed (loss) income of subsidiaries			(49,936,000)	41,071,000	(38,228,000)
Income tax benefit			(28,882,000)	4,508,000	(28,544,000)
Equity in undistributed (loss) income of subsidiaries			(40,355,000)	(52,408,000)	4,818,000
Net (loss) income			(21,054,000)	36,563,000	(9,684,000)
Net loss (income) applicable to non-vested restricted shares			(306,000)	350,000	(266,000)
Net (loss) income applicable to common shares			(20,748,000)	25,437,000	(19,717,000)
Parent Company [Member]
Income
Dividends from subsidiaries			38,000,000	104,000,000
Interest income			619,000	259,000	518,000
Net losses on early extinguishment of debt			(558,000)
Securities transactions and other			1,982,000	(189,000)	1,950,000
Total income			40,043,000	104,070,000	2,468,000
Expenses
Interest expense			14,840,000	9,892,000	9,124,000
Salaries and employee benefits			13,232,000	10,865,000	11,056,000
Other expenses			5,740,000	4,756,000	6,178,000
Total expenses			33,812,000	25,513,000	26,358,000
(Loss) income before income tax benefit and equity in undistributed (loss) income of subsidiaries			6,231,000	78,557,000	(23,890,000)
Income tax benefit			13,070,000	10,414,000	9,388,000
(Loss) income before undistributed (loss) income of subsidiaries			19,301,000	88,971,000	(14,502,000)
Equity in undistributed (loss) income of subsidiaries			(40,355,000)	(52,408,000)	4,818,000
Net (loss) income			(21,054,000)	36,563,000	(9,684,000)
Preferred dividends and accretion on preferred stock				(10,776,000)	(10,299,000)
Net loss (income) applicable to non-vested restricted shares			306,000	(350,000)	266,000
Net (loss) income applicable to common shares			$ (20,748,000)	$ 25,437,000	$ (19,717,000)