INTERIM CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $) In Thousands	9 Months Ended
	Sep. 30, 2011	Sep. 30, 2010
Cash flows from operating activities:
Net income before noncontrolling interests	$ 238,903	$ 102,835
Adjustments to reconcile net income to net cash provided by operating activities:
Net gain from note repurchases and termination of corresponding interest rate swaps	(3,123)
(Reduction of) provision for loan losses	(2,144)	29,124
Provision for unfunded credit commitments	2,131	2,561
Changes in fair values of derivatives, net	(20,334)	1,556
Gains on investment securities, net	(175,279)	(67,420)
Depreciation and amortization	19,999	17,554
Amortization of premiums on available-for-sale securities, net	18,170	15,593
Tax benefit (expense) from stock exercises	854	(306)
Amortization of share-based compensation	13,501	9,904
Amortization of deferred loan fees	(43,806)	(36,652)
Deferred income tax expense	3,135	1,794
Losses on sale of and valuation adjustments to other real estate owned property		24
Changes in other assets and liabilities:
Accrued interest receivable and payable, net	(13,919)	5,817
Accounts receivable	(2,724)	(10,768)
Income tax receivable, net	8,174	23,933
Prepaid FDIC assessments and amortization	6,468	7,704
Accrued compensation	9,968	22,567
Foreign exchange spot contracts, net	10,587	4,849
Other, net	19,627	14,193
Net cash provided by operating activities	90,188	144,862
Cash flows from investing activities:
Purchases of available-for-sale securities	(5,034,425)	(4,167,462)
Proceeds from sales of available-for-sale securities	1,414,794	653,122
Proceeds from maturities and pay downs of available-for-sale securities	2,048,439	1,526,562
Purchases of nonmarketable securities (cost and equity method accounting)	(43,260)	(36,847)
Proceeds from sales of nonmarketable securities (cost and equity method accounting)	21,524	12,185
Purchases of nonmarketable securities (investment fair value accounting)	(127,362)	(78,667)
Proceeds from sales and distributions of nonmarketable securities (investment fair value accounting)	66,541	25,866
Net increase in loans	(792,169)	(322,723)
Proceeds from recoveries of charged-off loans	21,626	13,397
Proceeds from sale of other real estate owned		196
Payment for acquisition of intangibles, net of cash acquired		(360)
Purchases of premises and equipment	(21,600)	(21,031)
Net cash used for investing activities	(2,445,892)	(2,395,762)
Cash flows from financing activities:
Net increase in deposits	1,802,281	2,083,008
(Decrease) increase in short-term borrowings	(37,245)	20,980
Payments for repurchases of 5.70% Senior Notes and 6.05% Subordinated Notes, including repurchase premiums and associated fees	(346,443)
Proceeds from termination of portions of interest rate swaps associated with 5.70% Senior Notes and 6.05% Subordinated Notes	36,959
Payments for settlement of 3.875% Convertible Notes	(250,000)
Proceeds from issuance of 5.375% Senior Notes, net of discount and issuance cost		344,294
Capital contributions from noncontrolling interests, net of distributions	79,727	56,547
Tax benefit from stock exercises	5,694	3,197
Proceeds from issuance of common stock and Employee Stock Purchase Plan	30,271	15,210
Repurchase of warrant under Capital Purchase Program		(6,820)
Net cash provided by financing activities	1,321,244	2,516,416
Net (decrease) increase in cash and cash equivalents	(1,034,460)	265,516
Cash and cash equivalents at beginning of period	3,076,432	3,512,853
Cash and cash equivalents at end of period	2,041,972	3,778,369
Cash paid during the period for:
Interest	37,776	22,903
Income taxes	74,313	21,360
Noncash items during the period:
Unrealized gains on available-for-sale securities, net of tax	77,486	40,534
Net change in fair value of interest rate swaps	$ (1,753)	$ 20,362