Consolidated Statements of Cash Flows (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014		Dec. 31, 2013	Dec. 31, 2012
Cash flows from operating activities:
Net income before noncontrolling interests	$ 478,715		$ 546,119	$ 249,813
Adjustments to reconcile net income to net cash provided by operating activities:
Provision for loan losses	59,486		63,693	44,330
Provision for unfunded credit commitments	6,511		7,642	488
Changes in fair values of derivatives, net	(22,139)		(31,508)	(10,123)
Gains on investment securities, net	(267,023)		(419,408)	(122,114)
Depreciation and amortization	39,696		35,894	28,122
Impairment loss on SVBIF Sale Transaction	13,934		0	0
Amortization of premiums and discounts on available-for-sale securities, net	25,311		29,774	55,580
Tax (expense) benefit from stock exercises	(7)		(1,167)	2,189
Amortization of share-based compensation	29,545		25,413	21,861
Amortization of deferred loan fees	(82,724)		(73,008)	(58,517)
Deferred income tax (benefit) expense	(43,516)		14,080	1,800
Gain on the sale of certain assets related to our equity services management business	0		0	(4,243)
Changes in other assets and liabilities:
Accrued interest receivable and payable, net	(26,642)		(3,241)	(6,254)
Accounts receivable and payable, net	(302)		(21)	35,221
Income tax payable and receivable, net	(4,804)		(24,811)	9,631
Accrued compensation	3,707		22,925	(15,918)
Foreign exchange spot contracts, net	25,725		2,086	(50,901)
Other, net	20,044		(22,684)	15,143
Net cash provided by operating activities	255,517		171,778	196,108
Cash flows from investing activities:
Purchases of available-for-sale securities	(8,462,071)		(3,336,476)	(3,877,852)
Proceeds from sales of available-for-sale securities	30,398		14,753	329,161
Proceeds from maturities and pay downs of available-for-sale securities	1,569,173		2,428,023	2,734,166
Purchases of held-to-maturity securities	(2,612,848)		0	0
Proceeds from maturities and paydowns of held-to-maturity securities	598,454		0	0
Purchases of nonmarketable securities (cost and equity method accounting)	(60,202)		(24,847)	(126,318)
Proceeds from sales of nonmarketable securities (cost and equity method accounting)	59,442		58,828	51,246
Purchases of non-marketable and other securities (fair value accounting)	(275,640)		(149,707)	(135,362)
Proceeds from sales and distributions of non-marketable and other securities (fair value accounting)	436,170		132,931	124,538
Net increase in loans	(3,480,531)		(1,943,650)	(1,964,250)
Proceeds from recoveries of charged-off loans	6,155		11,161	9,693
Purchases of premises and equipment	(42,431)		(30,004)	(34,260)
Proceeds from the sale of certain assets related to our equity services management business	0		0	2,870
Net cash used for investing activities	(12,233,931)		(2,838,988)	(2,886,368)
Cash flows from financing activities:
Net increase in deposits	11,870,520		3,296,527	2,466,916
Increase (decrease) in short-term borrowings	2,701		(161,030)	166,110
Principal payments of other long term debt	0		0	(1,222)
Capital contributions from noncontrolling interests, net of distributions	(89,186)		8,114	59,057
Tax benefit from stock exercises	9,602		6,826	5,581
Proceeds from issuance of common stock and ESPP	22,146		46,569	29,282
Net proceeds from public equity offering	434,866		0	0
Principal payments of 5.70% Senior Notes	0		0	(141,429)
Net cash provided by financing activities	12,250,649		3,197,006	2,584,295
Net increase (decrease) in cash and cash equivalents	272,235		529,796	(105,965)
Cash and cash equivalents at beginning of period	1,538,779		1,008,983	1,114,948
Cash and cash equivalents at end of period	1,796,062		1,538,779	1,008,983
Cash and cash equivalents, at end of period, including discontinued operations	1,811,014	[1]
Cash paid during the period for:
Interest	35,181		31,913	31,048
Income taxes	208,558		142,231	95,678
Noncash items during the period:
Changes in unrealized gains and losses on available-for-sale securities, net of tax	66,520		(154,013)	23,612
Transfers from available-for-sale securities to held-to-maturity	$ 5,418,572		$ 0	$ 0

[1] Cash and cash equivalents at December 31, 2014 included $15.0 million recognized in assets held-for-sale in conjunction with the SVBIF Sale Transaction.