Interim Consolidated Statements of Cash Flows (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Cash flows from operating activities:
Net income before noncontrolling interests	$ 274,706	$ 60,545
Adjustments to reconcile net income to net cash provided by operating activities:
Provision for loan losses	494	5,813
Provision for unfunded credit commitments	1,123	2,014
Changes in fair values of derivatives, net	13,356	757
Gains on investment securities, net	(223,912)	(27,438)
Depreciation and amortization	9,459	8,479
Amortization of premiums and discounts on available-for-sale securities, net	7,541	8,348
Tax expense from stock exercises	0	(1,247)
Amortization of share-based compensation	7,078	5,826
Amortization of deferred loan fees	(20,502)	(15,040)
Deferred income tax expense (benefit)	15,783	(19)
Losses from the write-off of premises and equipment	0	363
Changes in other assets and liabilities:
Accrued interest receivable and payable, net	(6,604)	(4,735)
Accounts receivable and payable, net	(7,885)	6,220
Income tax payable and receivable, net	25,159	6,236
Accrued compensation	(74,687)	(62,375)
Foreign exchange spot contracts, net	22,634	26,534
Other, net	1,821	(21,325)
Net cash provided by (used for) operating activities	45,564	(1,044)
Cash flows from investing activities:
Purchases of available-for-sale securities	(1,531,045)	(219,987)
Proceeds from sales of available-for-sale securities	2,097	581
Proceeds from maturities and pay downs of available-for-sale securities	694,243	653,764
Purchases of non-marketable and other securities (cost and equity method accounting)	(5,398)	(5,112)
Proceeds from sales and distributions of non-marketable and other securities (cost and equity method accounting)	19,053	7,942
Purchases of non-marketable and other securities (fair value accounting)	(45,125)	(30,342)
Proceeds from sales and distributions of non-marketable and other securities (fair value accounting)	92,558	21,748
Net increase in loans	66,086	108,971
Proceeds from recoveries of charged-off loans	1,312	1,367
Purchases of premises and equipment	(5,974)	(6,606)
Net cash (used for) provided by investing activities	(712,193)	532,326
Cash flows from financing activities:
Net increase in deposits	3,003,926	133,456
Decrease in short-term borrowings	(270)	(158,650)
Capital contributions from noncontrolling interests, net of distributions	(23,482)	(14,493)
Tax benefit from stock exercises	1,996	610
Proceeds from issuance of common stock, ESPP, and ESOP	8,144	18,061
Net cash provided by (used for) financing activities	2,990,314	(21,016)
Net increase in cash and cash equivalents	2,323,685	510,266
Cash and cash equivalents at beginning of period	1,538,779	1,008,983
Cash and cash equivalents at end of period	3,862,464	1,519,249
Cash paid during the period for:
Interest	12,688	12,372
Income taxes	15,486	19,318
Noncash items during the period:
Changes in unrealized gains and losses on available-for-sale securities, net of tax	$ 17,488	$ (12,409)