Interim Consolidated Statements of Cash Flows (USD $) In Thousands, unless otherwise specified	9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011
Cash flows from operating activities:
Net income before noncontrolling interests	$ 150,151	$ 238,903
Adjustments to reconcile net income to net cash provided by operating activities:
Provision for (reduction of) loan losses	29,316	(2,144)
Provision for unfunded credit commitments	1,264	2,131
Changes in fair values of derivatives, net	(4,411)	(20,334)
Gains on investment securities, net	(53,876)	(175,279)
Depreciation and amortization	22,651	19,999
Amortization of premiums and discounts on available-for-sale securities, net	42,511	18,170
Tax benefit from stock exercises	1,245	854
Amortization of share-based compensation	16,594	13,501
Amortization of deferred loan fees	(42,308)	(43,806)
Deferred income tax expense	(997)	3,135
Gain on the sale of certain assets related to our equity services management business	(4,243)	0
Net gain from note repurchases and termination of corresponding interest rate swaps	0	(3,123)
Changes in other assets and liabilities:
Accrued interest receivable and payable, net	(9,084)	(13,919)
Accounts receivable and payable, net	33,277	(3,441)
Income tax payable and receivable, net	6,223	8,174
Prepaid FDIC assessments and amortization	6,896	6,468
Accrued compensation	(40,600)	9,968
Foreign exchange spot contracts, net	(41,188)	10,587
Other, net	12,244	20,344
Net cash (used for) provided by operating activities	125,665	90,188
Cash flows from investing activities:
Purchases of available-for-sale securities	(2,859,155)	(5,034,425)
Proceeds from sales of available-for-sale securities	326,178	1,414,794
Proceeds from maturities and pay downs of available-for-sale securities	2,047,753	2,048,439
Purchases of nonmarketable securities (cost and equity method accounting)	(114,134)	(43,260)
Proceeds from sales of nonmarketable securities (cost and equity method accounting)	31,903	21,524
Purchases of nonmarketable securities (fair value accounting)	(99,062)	(127,362)
Proceeds from sales and distributions of nonmarketable securities (fair value accounting)	94,188	66,541
Net increase in loans	(1,218,366)	(792,169)
Proceeds from recoveries of charged-off loans	8,018	21,626
Purchases of premises and equipment	(31,548)	(21,600)
Proceeds from the sale of certain assets related to our equity services management business	2,870	0
Net cash used for investing activities	(1,811,355)	(2,445,892)
Cash flows from financing activities:
Net increase in deposits	1,015,530	1,802,281
Increase (decrease) in short-term borrowings	508,170	(37,245)
Principal payments of other long term debt	(1,222)	0
Capital contributions from noncontrolling interests, net of distributions	63,956	79,727
Tax benefit from stock exercises	5,067	5,694
Proceeds from issuance of common stock and ESPP	27,350	30,271
Principal payments of 5.70% Senior Notes	(141,429)	0
Payments for repurchases of portions of 5.70% Senior Notes and 6.05% Subordinated Notes, including repurchase premiums and associated fees	0	(346,443)
Proceeds from termination of portions of interest rate swaps associated with 5.70% Senior Notes and 6.05% Subordinated Notes	0	36,959
Payments for settlement of 3.875% Convertible Notes	0	(250,000)
Net cash provided by financing activities	1,477,422	1,321,244
Net increase (decrease) in cash and cash equivalents	(208,268)	(1,034,460)
Cash and cash equivalents at beginning of period	1,114,948	3,076,432
Cash and cash equivalents at end of period	906,680	2,041,972
Cash paid during the period for:
Interest	28,000	37,776
Income taxes	69,094	74,313
Noncash items during the period:
Unrealized gains (losses) on available-for-sale securities, net of tax	$ 36,170	$ 77,486