Condensed Consolidated Statements Of Cash Flows (USD $)	9 Months Ended
	Sep. 30, 2011	Sep. 30, 2010
Cash Flows from Operating Activities
Net income/(loss)	$ 72,901,000	$ (6,094,000)
Adjustments to reconcile net income to net cash provided by/(used in) operating activities:
Provision for loan losses	25,000,000	146,900,000
Provision for losses on other real estate owned	9,088,000	8,062,000
Deferred tax liability/(benefit)	4,380,000	(14,713,000)
Depreciation	4,577,000	4,753,000
Net gains on sale and transfer of other real estate owned	(4,842,000)	(7,049,000)
Net gains on sale of loans	(2,851,000)	(149,000)
Proceeds from sale of loans	20,699,000	12,681,000
Originations of loans held-for-sale	(10,992,000)	(7,332,000)
Write-downs on loans held-for-sale		3,160,000
Increase in trading securities, net	(153,440,000)
Mark-to-market of trading securities	281,000
Write-downs on venture capital investments	57,000	392,000
Write-downs on impaired securities		492,000
Gain on sales and calls of securities	(20,243,000)	(9,603,000)
Increase in fair value of warrants	(12,000)	(17,000)
(Decrease)/increase in unrealized loss from interest rate swaps mark-to-market	(2,580,000)	7,146,000
Other non-cash interest	(399,000)	(562,000)
Amortization/accretion of security premiums/discounts, net	2,903,000	4,073,000
Amortization of intangibles	4,475,000	4,534,000
Excess tax short-fall from share-based payment arrangements	276,000	362,000
Stock based compensation expense	1,278,000	2,690,000
Increase/(decrease) in deferred loan fees, net	739,000	(599,000)
Decrease in accrued interest receivable	5,463,000	2,309,000
Decrease in other assets, net	7,427,000	15,559,000
Increase/(decrease) in other liabilities	4,214,000	(12,377,000)
Net cash provided by operating activities	(31,601,000)	154,618,000
Cash Flows from Investing Activities
Decrease in short-term investments	172,629,000	6,171,000
Decrease in securities purchased under agreements to resell	30,000,000
Purchase of investment securities available-for-sale	(371,116,000)	(3,047,136,000)
Proceeds from maturity and calls of investment securities available-for-sale	385,000,000	2,272,239,000
Proceeds from sale of investment securities available-for-sale	503,561,000	65,073,000
Purchase of mortgage-backed securities available-for-sale	(403,123,000)
Proceeds from repayment and sale of mortgage-backed securities available-for-sale	843,248,000	913,226,000
Purchase of investment securities held-to-maturity		(30,541,000)
Purchase of mortgage-backed securities held-to-maturity	(480,083,000)
Proceeds from maturity and call of investment securities held-to-maturity	82,703,000	60,660,000
Redemption of Federal Home Loan Bank stock	7,698,000	5,284,000
Net increase in loans	(283,232,000)	(147,884,000)
Purchase of premises and equipment	(1,995,000)	(4,484,000)
Proceeds from sale of other real estate owned	50,115,000	68,791,000
Net increase in investment in affordable housing	(968,000)	(2,767,000)
Net cash provided by investing activities	534,437,000	158,632,000
Cash Flows from Financing Activities
Net increase in demand deposits, NOW accounts, money market and savings deposits	108,622,000	195,548,000
Net increase/(decrease) in time deposits	25,062,000	(592,296,000)
Net (decrease)/increase in federal funds purchased and securities sold under agreements to repurchase	(153,500,000)	9,000,000
Advances from Federal Home Loan Bank	3,473,000
Repayment of Federal Home Loan Bank borrowings	(348,473,000)	(65,000,000)
Dividends paid on common stock	(2,359,000)	(2,355,000)
Dividends paid on preferred stock	(9,675,000)	(9,675,000)
Issuance of common stock		124,922,000
Proceeds from other borrowings		1,139,000
Repayment of other borrowings	(5,695,000)
Proceeds from shares issued under Dividend Reinvestment Plan	205,000	229,000
Proceeds from exercise of stock options	1,306,000
Excess tax short-fall from share-based payment arrangements	(276,000)	(362,000)
Net cash used in financing activities	(381,310,000)	(338,850,000)
Increase/(decrease) in cash and cash equivalents	121,526,000	(25,600,000)
Cash and cash equivalents, beginning of the period	87,347,000	100,124,000
Cash and cash equivalents, end of the period	208,873,000	74,524,000
Supplemental disclosure of cash flow information
Interest	111,300,000	154,195,000
Income taxes paid/(refunded)	39,750,000	(3,942,000)
Non-cash investing and financing activities:
Net change in unrealized holding (loss)/gain on securities available-for-sale, net of tax	(4,469,000)	25,193,000
Loans to facilitate sale of loans	6,094,000	22,700,000
Transfers to other real estate owned from loans held for investment	73,161,000	69,727,000
Transfers to other real estate owned from loans held-for-sale	2,873,000	20,922,000
Loans transferred from investment to held for sale	4,139,000	1,329,000
Loans to facilitate the sale of other real estate owned	$ 7,703,000	$ 11,775,000