Interim Consolidated Statements of Cash Flows (USD $) In Thousands, unless otherwise specified	9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013
Cash flows from operating activities:
Net income before noncontrolling interests	$ 348,078	$ 353,213
Adjustments to reconcile net income to net cash provided by operating activities:
Provision for loan losses	19,051	35,023
Provision for unfunded credit commitments	5,533	6,135
Changes in fair values of derivatives, net	11,087	(16,594)
Gains on investment securities, net	(172,236)	(255,861)
Depreciation and amortization	29,041	26,474
Amortization of premiums and discounts on investment securities, net	18,700	21,040
Tax expense from stock exercises	(1)	(1,353)
Amortization of share-based compensation	22,285	18,945
Amortization of deferred loan fees	(59,550)	(51,941)
Deferred income tax benefit	(17,897)	(3,488)
Changes in other assets and liabilities:
Accrued interest receivable and payable, net	(17,488)	(5,183)
Accounts receivable and payable, net	(12,890)	1,463
Income tax payable and receivable, net	(14,234)	(7,787)
Accrued compensation	(24,241)	(7,481)
Foreign exchange spot contracts, net	97,357	12,442
Other, net	(25,388)	(27,005)
Net cash provided by operating activities	207,207	98,042
Cash flows from investing activities:
Purchases of available-for-sale securities	(8,060,750)	(906,495)
Proceeds from sales of available-for-sale securities	32,135	10,207
Proceeds from maturities and pay downs of available-for-sale securities	1,352,369	1,879,424
Purchases of held-to-maturity securities	(1,577,634)	0
Proceeds from maturities and pay downs of held-to-maturity securities	327,913	0
Purchases of non-marketable and other securities (cost and equity method accounting)	(23,965)	(20,019)
Proceeds from sales and distributions of non-marketable and other securities (cost and equity method accounting)	47,478	47,069
Purchases of non-marketable and other securities (fair value accounting)	(182,247)	(108,663)
Proceeds from sales and distributions of non-marketable and other securities (fair value accounting)	264,389	103,105
Net increase in loans	(1,103,447)	(867,075)
Proceeds from recoveries of charged-off loans	5,313	8,163
Purchases of premises and equipment	(29,332)	(20,837)
Net cash (used for) provided by investing activities	(8,947,778)	124,879
Cash flows from financing activities:
Net increase in deposits	8,650,156	820,539
Increase (decrease) in short-term borrowings	1,550	(160,530)
Capital contributions from noncontrolling interests, net of distributions	(37,984)	7,922
Tax benefit from stock exercises	7,973	4,501
Proceeds from issuance of common stock, ESPP, and ESOP	17,768	38,408
Net proceeds from public equity offering	434,866	0
Net cash provided by financing activities	9,074,329	710,840
Net increase in cash and cash equivalents	333,758	933,761
Cash and cash equivalents at beginning of period	1,538,779	1,008,983
Cash and cash equivalents at end of period	1,872,537	1,942,744
Cash paid during the period for:
Interest	30,259	28,339
Income taxes	154,746	107,282
Noncash items during the period:
Changes in unrealized gains and losses on available-for-sale securities, net of tax	47,758	(99,308)
Adjusted cost of transferred securities	5,418,572
Transfers from available-for-sale securities to held-to-maturity	$ 6,662,025	$ 0