Consolidated Statements of Cash Flows $ in Thousands	12 Months Ended
	Dec. 31, 2015 USD ($)		Dec. 31, 2014 USD ($)		Dec. 31, 2013 USD ($)
Cash flows from operating activities:
Net income before noncontrolling interests	$ 374,820	[1],[2],[3],[4]	$ 478,660	[2],[3],[4],[5],[6]	$ 544,783	[2],[3],[4],[5],[6]
Adjustments to reconcile net income to net cash provided by operating activities:
Provision for loan losses	97,629		59,486		63,693
(Reduction of) Provision for unfunded credit commitments	(1,946)		6,511		7,642
Changes in fair values of derivatives, net	(53,470)		(22,139)		(31,508)
Gains on investment securities, net	(89,445)		(267,023)		(419,408)
Depreciation and amortization	40,008		39,345	[5]	36,260	[5]
Impairment loss on SVBIF Sale Transaction	0		13,934		0
Impairment (gain) loss on SVBIF Sale Transaction	(1,287)		13,934		0
Amortization of premiums and discounts on available-for-sale securities, net	18,271		25,311		29,774
Amortization of share-based compensation	32,239		29,545		25,413
Amortization of deferred loan fees	(89,384)		(82,724)		(73,008)
Deferred income tax (benefit) expense	(9,133)		(43,110)	[5]	15,050	[5]
Changes in other assets and liabilities:
Accrued interest receivable and payable, net	(8,397)		(26,642)		(3,241)
Accounts receivable and payable, net	(24,029)		(302)		(21)
Income tax payable and receivable, net	(9,857)		(4,804)		(24,811)
Accrued compensation	30,293		3,707		22,925
Foreign exchange spot contracts, net	(31,159)		25,725		2,086
Other, net	64,660		20,037		(23,851)
Net cash provided by operating activities	339,813		255,517		171,778
Cash flows from investing activities:
Purchases of available-for-sale securities	(4,586,680)		(8,462,071)		(3,336,476)
Proceeds from sales of available-for-sale securities	8,054		30,398		14,753
Proceeds from maturities and pay downs of available-for-sale securities	1,704,918		1,569,173		2,428,023
Purchases of held-to-maturity securities	(2,888,805)		(2,612,848)		0
Proceeds from maturities and paydowns of held-to-maturity securities	1,495,362		598,454		0
Purchases of nonmarketable securities (cost and equity method accounting)	(32,427)		(60,202)		(24,847)
Proceeds from sales of nonmarketable securities (cost and equity method accounting)	89,826		59,442		58,828
Purchases of non-marketable and other securities (fair value accounting)	(7,028)		(275,640)		(149,707)
Proceeds from sales and distributions of non-marketable and other securities (fair value accounting)	48,627		436,170		132,931
Net increase in loans	(2,335,153)		(3,480,531)		(1,943,650)
Proceeds from recoveries of charged-off loans	5,593		6,155		11,161
Purchases of premises and equipment	(53,918)		(42,431)		(30,004)
Effect of deconsolidation due to adoption of ASU 2015-02	15,995		0		0
Net proceeds from SVBIF sale transaction	39,284	[7]	0		0
Net cash used for investing activities	(6,496,352)		(12,233,931)		(2,838,988)
Cash flows from financing activities:
Net increase in deposits	4,719,738		11,870,520		3,296,527
Increase (decrease) in short-term borrowings	767,119		2,701		(161,030)
(Distributions to noncontrolling interests), net of contributions from noncontrolling interests	(23,518)		(89,186)		8,114
Tax benefit from stock exercises	16,602		9,602		6,826
Proceeds from issuance of common stock, ESPP, and ESOP	22,410		22,146		46,569
Proceeds from issuance of 3.50% Senior Notes	346,431		0		0
Net proceeds from public equity offering	0		434,866		0
Net cash provided by financing activities	5,848,782		12,250,649		3,197,006
Net increase (decrease) in cash and cash equivalents	(307,757)		272,235		529,796
Cash and cash equivalents at beginning of period	1,796,062		1,538,779	[7]	1,008,983
Cash and cash equivalents at end of period	1,503,257		1,796,062		1,538,779	[7]
Cash and cash equivalents, at end of period, including discontinued operations	1,503,257		1,811,014	[7]
Cash paid during the period for:
Interest	35,280		35,181		31,913
Income taxes	220,484		208,558		142,231
Noncash items during the period:
Changes in unrealized gains and losses on available-for-sale securities, net of tax	(22,692)		66,520		(154,013)
Distributions Of Stock From Investments	64,503	[8]	20,621		1,116
Transfers from available-for-sale securities to held-to-maturity	0		$ 5,418,572		$ 0
Distributions of stock from investments to NCI	$ 41,500

[1] During the second quarter of 2015 we adopted new accounting guidance related to our consolidated variable interest entities (ASU 2015-02). Amounts prior to January 1, 2015 have not been revised for the adoption of this guidance. See Note 2— "Summary of Significant Accounting Policies” of the “Notes to the Consolidated Financial Statements” under Part II, Item 8 of this report for additional details.

[2] During the second quarter of 2015 we adopted new accounting guidance related to our consolidated variable interest entities (ASU 2015-02). Amounts prior to January 1, 2015 have not been revised for the adoption of this guidance. See Note 2— "Summary of Significant Accounting Policies” of the “Notes to the Consolidated Financial Statements” under Part II, Item 8 of this report for additional details.

[3] Prior period amounts have been revised to reflect the retrospective application of new accounting guidance adopted in the first quarter of 2015 related to our investments in qualified affordable housing projects (ASU 2014-01). See Note 2— "Summary of Significant Accounting Policies” of the “Notes to the Consolidated Financial Statements” under Part II, Item 8 of this report for additional details.

[4] Prior period amounts have been revised to reflect the retrospective application of new accounting guidance adopted in the first quarter of 2015 related to our investments in qualified affordable housing projects (ASU 2014-01). See Note 2— "Summary of Significant Accounting Policies” of the “Notes to the Consolidated Financial Statements” under Part II, Item 8 of this report for additional details.

[5] Cash flows for the years ended December 31, 2014 and 2013 were revised to reflect the retrospective application of our adoption of ASU 2014-01.

[6] See Note 2— "Summary of Significant Accounting Policies-Adoptions of New Accounting Standards” of the “Notes to the Consolidated Financial Statements” under Part II, Item 8 of this report for additional details.

[7] 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. On April 13, 2015 we received net proceeds of $39.3 million consisting of the sales price of $48.6 million less $9.3 million of cash and cash equivalents held by SVBIF that were sold.

[8] For the year ended December 31, 2015, includes distributions to our noncontrolling interests of $41.5 million.