Note 25 - Condensed Parent Company Financial Statements (Detail) - Statements of Cash Flows (Parent Company Only) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009	Dec. 31, 2008
Operating Activities
Net income (loss)		$ 36,563	$ (9,684)	$ (25,750)
Adjustments to reconcile net income (loss) to net cash provided by (used in) operating activities:
Equity in undistributed loss (income) of subsidiaries		52,408	(4,818)	22,513
Depreciation of premises, furniture, and equipment	10,995	10,995	11,397	10,917
Net losses on securities		(2,410)	(12,216)	(2,110)
Gains on early extinguishment of debt				(15,258)
Share-based compensation expense		6,362	5,638	3,516
Net (increase) decrease in other assets		7,674	31,130	(22,945)
Net increase (decrease) in other liabilities		(1,903)	14,412	(48,589)
Investing Activities
Purchases of securities available-for-sale		(391,282)	(375,342)	(187,412)
Proceeds from sales of premises, furniture, and equipment		1,252	(92)	(6)
Purchase of premises, furniture, and equipment		(11,018)	(22,265)	(4,682)
Net cash used in investing activities		113,344	413,195	915,774
Financing Activities
Proceeds (payments) for the issuance (retirement) of subordinated debt		(114,387)		19,400
Redemption of Preferred Shares and related Warrant					193,000
Proceeds from the issuance of Common Stock			196,035
Cash dividends paid		(12,838)	(12,422)	(12,423)
Exercise of stock options and restricted stock activity		1,256	401	379
Excess tax benefit (expense) related to share-based compensation		47	(189)	(177)
Net cash (used in) provided by financing activities		(224,711)	(148,367)	(987,244)
Net decrease in cash and cash equivalents		55,754	458,397	13,071
Cash and cash equivalents at beginning of year		585,776	127,379	114,308
Cash and cash equivalents at end of year	641,530	641,530	585,776	127,379	114,308
Parent Company [Member]
Operating Activities
Net income (loss)		36,563	(9,684)	(25,750)
Adjustments to reconcile net income (loss) to net cash provided by (used in) operating activities:
Equity in undistributed loss (income) of subsidiaries		52,408	(4,818)	22,513
Depreciation of premises, furniture, and equipment		9	10	8
Net losses on securities			110
Gains on early extinguishment of debt				(15,258)
Share-based compensation expense		6,362	5,638	3,516
Tax (expense) benefit related to share-based compensation		(179)	350	581
Net (increase) decrease in other assets		(10,290)	4,053	(10,370)
Net increase (decrease) in other liabilities		4,618	(263)	(9,850)
Net cash provided by (used in) operating activities		89,491	(4,604)	(34,610)
Investing Activities
Purchases of securities available-for-sale				(1,050)
Proceeds from sales and maturities of securities available-for-sale		14	16	800
Proceeds from sales of premises, furniture, and equipment		103
Purchase of premises, furniture, and equipment		(16)	(96)	(15)
Capital injection into subsidiary bank			(100,000)
Capital injection into non-bank subsidiary		(363)	(750)
Purchase of non-performing assets from subsidiary bank (1)			(168,088)
Net cash used in investing activities		(262)	(268,918)	(265)
Financing Activities
Proceeds (payments) for the issuance (retirement) of subordinated debt		114,387		(19,400)
Redemption of Preferred Shares and related Warrant		(193,910)
Proceeds from the issuance of Common Stock			196,035
Cash dividends paid		(12,838)	(12,422)	(12,423)
Exercise of stock options and restricted stock activity		(1,256)	(401)	(379)
Excess tax benefit (expense) related to share-based compensation		47	(189)	(177)
Net cash (used in) provided by financing activities		(93,570)	183,023	(32,379)
Net decrease in cash and cash equivalents		(4,341)	(90,499)	(67,254)
Cash and cash equivalents at beginning of year		51,442	141,941	209,195
Cash and cash equivalents at end of year	$ 47,101	$ 47,101	$ 51,442	$ 141,941