Consolidated Statements Of Cash Flows (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Cash Flows from Operating Activities
Net income/(loss)	$ 100,755	$ 12,175	$ (66,779)
Adjustments to reconcile net income to net cash provided by operating activities:
Provision for credit losses	27,000	156,900	307,000
Provision for losses on other real estate owned	10,385	20,139	28,216
Deferred tax liability/(benefit)	13,808	(38,504)	(37,115)
Depreciation	6,079	4,619	7,695
Net (gains)/losses on sale and transfers of other real estate owned	(5,243)	(9,977)	2,065
Net gains on sale of loans	(3,354)	(149)	(4,761)
Net gains on sale of loans held for sale	(88)	(779)
Proceeds from sale of loans	46,377	7,481	44,597
Originations of loans held for sale	(14,027)	(7,332)	(9,418)
Write-down on loans held for sale		3,160
(Decrease)/increase in unrealized loss from interest rate swaps	(3,874)	5,814
Purchase of trading securities	(745)	(3,795)
Write-down on venture capital and other investments	379	515	1,982
Write-downs on impaired securities	200	492	817
Gain on sales and calls of securities	(21,131)	(19,253)	(56,461)
Other non-cash interest	(480)	(794)	7
Amortization of security premiums, net	4,233	6,667	2,816
Amortization of other intangible assets	5,965	6,034	6,703
Excess tax short-fall from stock options	290	539	196
Stock based compensation expense	1,758	3,337	5,725
Decrease in accrued interest receivable	3,156	600	7,621
Noncontrolling interest.	(605)	(610)	(611)
Increase/(decrease) in other assets, net	(534)	34,594	(63,426)
Increase/(decrease) in other liabilities	3,746	(13,368)	(30,461)
Net cash provided by operating activities	174,050	168,505	146,408
Cash Flows from Investing Activities
(Increase)/decrease in short-term investments	(88,634)	48,404	(229,726)
Decrease/(increase) in securities purchased under agreements to resell	110,000	(110,000)	201,000
Purchase of investment securities available-for-sale	(571,093)	(3,366,780)	(1,573,823)
Proceeds from maturity and call of investment securities available-for-sale	435,000	2,876,414	1,428,468
Proceeds from sale of investment securities available-for-sale	524,958	65,139	51,679
Purchase of mortgage-backed securities available-for-sale	(541,356)		(2,487,276)
Proceeds from repayment and sale of mortgage-backed securities available-for-sale	868,023	1,351,018	2,760,904
Purchase of investment securities held-to-maturity		(150,164)	(99,858)
Purchase of mortgage-backed securities held-to-maturity	(480,083)	(165,527)	(536,262)
Proceeds from maturity and call of investment securities held-to-maturity	163,855	108,067	1,057
Redemption of Federal Home Loan Bank stock	10,884	7,918
Net (increase)/decrease in loans	(362,054)	(151,054)	177,690
Purchase of premises and equipment	(2,888)	(4,979)	(12,222)
Proceeds from sales of other real estate owned	61,406	91,154	52,902
Net increase in investment in affordable housing	(968)	(3,015)	(14,116)
Net cash provided by/(used in) investing activities	127,050	596,595	(279,583)
Cash Flows from Financing Activities
Net increase in demand deposits, NOW accounts, money market and saving deposits	180,940	224,122	529,359
Net increase/(decrease) in time deposits	56,828	(736,549)	138,945
Net (decrease)/increase in federal funds purchased and securities sold under agreement to repurchase	(161,000)	4,000	(105,000)
Advances from Federal Home Loan Bank ..	4,734,000	528,000	816,000
Repayment of Federal Home Loan Bank borrowings	(5,059,000)	(907,362)	(1,336,000)
Cash dividends	(16,046)	(16,040)	(22,460)
Issuance of common stock		124,928	119,448
Proceeds from other borrowings		1,253	7,212
Repayment of other borrowings	(7,584)
Proceeds from shares issued to Dividend Reinvestment Plan	287	310	1,160
Proceeds from exercise of stock options	1,306		13
Excess tax short-fall from share-based payment arrangements	(290)	(539)	(196)
Net cash (used in)/provided by financing actvities	(270,559)	(777,877)	148,481
Increase/(decrease) in cash and cash equivalents	30,541	(12,777)	15,306
Cash and cash equivalents, beginning of the year	87,347	100,124	84,818
Cash and cash equivalents, end of the year	117,888	87,347	100,124
Supplemental disclosure of cash flow information
Interest	142,644	197,762	255,243
Income taxes	53,148	13,369	25,247
Non-cash investing and financing activities:
Net change in unrealized holding gain on securities available-for-sale, net of tax	(7,710)	(147)	(24,202)
Adjustment to initially apply SFAS No. 160			8,500
Transfers to other real estate owned from loans held for investment	83,941	98,653	114,354
Transfers to other real estate owned from loans held for sale	2,874	21,473
Loans transferred to loans held for sale	4,399	4,332	81,678
Loans to facilitate the sale of other real estate owned	7,472	12,204	21,272
Loans to facilitate the sale of loans	$ 6,094	$ 23,500