SVB Financial (SIVBQ) 10-Q 6 Nov 15 2015 Q3 Quarterly report Financial data

Document and Entity Information

Document and Entity Information - shares	9 Months Ended
	Sep. 30, 2015	Oct. 31, 2015
Document and Entity Information [Abstract]
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Sep. 30, 2015
Document Fiscal Year Focus	2,015
Document Fiscal Period Focus	Q3
Trading Symbol	SIVB
Entity Registrant Name	SVB FINANCIAL GROUP
Entity Central Index Key	719,739
Current Fiscal Year End Date	--12-31
Entity Filer Category	Large Accelerated Filer
Entity Common Stock, Shares Outstanding		51,493,211

Interim Consolidated Balance Sh

Interim Consolidated Balance Sheets - USD ($) $ in Thousands		Sep. 30, 2015	Dec. 31, 2014
Assets
Cash and cash equivalents		$ 1,674,145	$ 1,796,062
Available-for-sale securities, at fair value (cost of $15,167,233 and $13,497,945, respectively)		15,307,661	13,540,655
Held-to-maturity securities, at cost (fair value of $8,367,003 and $7,415,656, respectively)		8,306,526	7,421,042
Non-marketable and other securities	[1]	650,555	1,728,140
Total investment securities		24,264,742	22,689,837
Loans, net of unearned income		15,314,580	14,384,276
Allowance for loan losses		(197,507)	(165,359)
Net loans		15,117,073	14,218,917
Premises and equipment, net of accumulated depreciation and amortization		94,652	79,845
Accrued interest receivable and other assets	[1]	580,370	553,208
Total assets		41,730,982	39,337,869
Liabilities:
Noninterest-bearing demand deposits		28,658,963	24,583,682
Interest-bearing deposits		8,390,454	9,759,817
Total deposits		37,049,417	34,343,499
Short-term borrowings		3,756	7,781
Other liabilities		566,370	483,493
Long-term debt		797,211	451,362
Total liabilities		$ 38,416,754	$ 35,286,135
Commitments and contingencies (Note 13 and Note 16)
SVBFG stockholders’ equity:
Preferred stock, $0.001 par value, 20,000,000 shares authorized; no shares issued and outstanding		$ 0	$ 0
Common stock, $0.001 par value, 150,000,000 shares authorized; 51,488,985 shares and 50,924,925 shares outstanding, respectively		51	51
Additional paid-in capital		1,171,649	1,120,350
Retained earnings	[1]	1,906,135	1,649,967
Accumulated other comprehensive income		97,064	42,704
Total SVBFG stockholders’ equity		3,174,899	2,813,072
Noncontrolling interests		139,329	1,238,662
Total equity		3,314,228	4,051,734	[2]
Total liabilities and total equity		$ 41,730,982	$ 39,337,869
[1]	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 1— "Basis of Presentation" of the "Notes to Interim Consolidated Financial Statements" under Part I, Item 1 in this report.
[2]	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 1— "Basis of Presentation" of the "Notes to Interim Consolidated Financial Statements" under Part I, Item 1 in this report.

Interim Consolidated Balance S3

Interim Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands	Sep. 30, 2015	Dec. 31, 2014
Statement of Financial Position [Abstract]
Available-for-sale securities, cost	$ 15,167,233	$ 13,497,945
Held-to-maturity securities	$ 8,367,003	$ 7,415,656
Preferred stock, par value	$ 0.001	$ 0.001
Preferred stock, shares authorized	20,000,000	20,000,000
Preferred stock, shares issued	0	0
Preferred stock, shares outstanding	0	0
Common stock, par value	$ 0.001	$ 0.001
Common stock, shares authorized	150,000,000	150,000,000
Common stock, shares outstanding	51,488,985	50,924,925

Interim Consolidated Statements

Interim Consolidated Statements of Income - USD ($) $ in Thousands		3 Months Ended		9 Months Ended
		Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	[1]	Sep. 30, 2014
Interest income:
Loans		$ 174,993	$ 153,292	$ 507,746		$ 449,144
Investment securities:
Taxable		87,609	73,540	253,496		191,384
Non-taxable		707	772	2,220		2,362
Federal funds sold, securities purchased under agreements to resell and other short-term investment securities		1,482	1,722	4,071		5,301
Total interest income		264,791	229,326	767,533		648,191
Interest expense:
Deposits		1,158	2,961	4,283		8,933
Borrowings		8,973	5,800	25,894		17,400
Total interest expense		10,131	8,761	30,177		26,333
Net interest income		254,660	220,565	737,356		621,858
Provision for loan losses		33,403	16,610	66,368		19,051
Net interest income after provision for loan losses		221,257	203,955	670,988		602,807
Noninterest income:
Gains on investment securities, net		18,768	5,644	77,006		172,236
Gains on derivative instruments, net		10,244	26,538	66,290		63,480
Foreign exchange fees		22,995	17,911	63,037		53,035
Credit card fees		14,536	10,909	40,841		31,440
Deposit service charges		12,272	10,126	34,309		29,344
Lending related fees		7,561	6,029	23,746		18,208
Client investment fees		5,683	3,814	15,429		10,751
Letters of credit and standby letters of credit fees		5,341	4,557	15,315		11,507
Other		11,077	(5,361)	22,315		14,601
Total noninterest income		108,477	80,167	358,288		404,602
Noninterest expense:
Compensation and benefits		109,345	99,932	350,030		302,259
Professional services		21,137	26,081	58,834		68,383
Premises and equipment		12,356	12,631	36,800		36,267
Business development and travel		8,028	10,022	28,904		29,465
Net occupancy		8,548	7,437	24,010		22,436
FDIC and state assessments		6,954	4,587	18,705		13,660
Correspondent bank fees		3,070	3,278	9,775		9,755
Provision for unfunded credit commitments		1,047	2,225	249		5,533
Other	[2]	14,270	13,568	42,101		33,355
Total noninterest expense	[2]	184,755	179,761	569,408		521,113
Income before income tax expense	[2]	144,979	104,361	459,868		486,296
Income tax expense	[2]	57,017	40,207	175,057		137,431
Net income before noncontrolling interests	[2],[3],[4]	87,962	64,154	284,811	[5]	348,865	[5],[6]
Net income attributable to noncontrolling interests	[3]	(6,229)	(177)	(28,419)		(142,985)
Net income available to common stockholders	[2]	$ 81,733	$ 63,977	$ 256,392		$ 205,880
Earnings per common share—basic (dollars per share)	[2]	$ 1.59	$ 1.26	$ 5		$ 4.26
Earnings per common share—diluted (dollars per share)		$ 1.57	$ 1.24	$ 4.94		$ 4.18
[1]	Amounts for the nine months ended September 30, 2015, have been revised to reflect the retrospective application of new accounting guidance adopted in the second quarter of 2015 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 1— "Basis of Presentation” of the “Notes to Interim Consolidated Financial Statements (unaudited)” under Part I, Item 1 of this report for additional details.
[2]	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 1— "Basis of Presentation" of the "Notes to Interim Consolidated Financial Statements" under Part I, Item 1 in this report.
[3]	Amounts for the nine months ended September 30, 2015, have been revised to reflect the retrospective application of new accounting guidance adopted in the second quarter of 2015 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 1— "Basis of Presentation” of the “Notes to Interim Consolidated Financial Statements (unaudited)” under Part I, Item 1 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 1— "Basis of Presentation" of the "Notes to Interim Consolidated Financial Statements" under Part I, Item 1 in this report.
[5]	Cash flows for the nine months ended September 30, 2015 were revised to reflect the adoption of ASU 2015-02 as of January 1, 2015 and cash flows for the nine months ended September 30, 2014 were revised to reflect the retrospective application of our adoption of ASU 2014-01.
[6]	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 1— "Basis of Presentation" of the "Notes to Interim Consolidated Financial Statements" under Part I, Item 1 in this report.

Interim Consolidated Statement5

Interim Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands		3 Months Ended		9 Months Ended
		Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015		Sep. 30, 2014
Statement of Comprehensive Income [Abstract]
Net income before noncontrolling interests	[1],[2],[3]	$ 87,962	$ 64,154	$ 284,811	[4],[5]	$ 348,865	[5],[6]
Change in cumulative translation gains:
Foreign currency translation gains (losses)		(102)	(2,259)	2,588		(638)
Related tax benefit (expense)		87	935	(1,054)		281
Change in unrealized gains on available-for-sale securities:
Unrealized holding gains (losses)		58,902	(48,724)	100,468		62,669
Related tax (expense) benefit		(24,200)	19,716	(41,224)		(25,292)
Reclassification adjustment for (gains) losses included in net income		(13)	990	(2,750)		17,411
Related tax expense (benefit)		6	(400)	1,111		(7,030)
Cumulative-effect adjustment for unrealized gains on securities transferred from available-for-sale to held-to-maturity		0	0	0		37,700
Related tax expense		0	0	0		(15,178)
Amortization of unrealized losses on securities transferred from available-for-sale to held-to-maturity		(2,565)	(2,996)	(7,997)		(4,043)
Related tax benefit		1,032	1,206	3,218		1,628
Other comprehensive income (loss), net of tax		33,147	(31,532)	54,360		67,508
Comprehensive income		121,109	32,622	339,171		416,373
Comprehensive income attributable to noncontrolling interests (2)	[1]	(6,229)	(177)	(28,419)	[4]	(142,985)
Comprehensive income attributable to SVBFG		$ 114,880	$ 32,445	$ 310,752		$ 273,388
[1]	Amounts for the nine months ended September 30, 2015, have been revised to reflect the retrospective application of new accounting guidance adopted in the second quarter of 2015 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 1— "Basis of Presentation” of the “Notes to Interim Consolidated Financial Statements (unaudited)” under Part I, Item 1 of this report for additional details.
[2]	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 1— "Basis of Presentation" of the "Notes to Interim Consolidated Financial Statements" under Part I, Item 1 in this report.
[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 1— "Basis of Presentation" of the "Notes to Interim Consolidated Financial Statements" under Part I, Item 1 in this report.
[4]	Amounts for the nine months ended September 30, 2015, have been revised to reflect the retrospective application of new accounting guidance adopted in the second quarter of 2015 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 1— "Basis of Presentation” of the “Notes to Interim Consolidated Financial Statements (unaudited)” under Part I, Item 1 of this report for additional details.
[5]	Cash flows for the nine months ended September 30, 2015 were revised to reflect the adoption of ASU 2015-02 as of January 1, 2015 and cash flows for the nine months ended September 30, 2014 were revised to reflect the retrospective application of our adoption of ASU 2014-01.
[6]	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 1— "Basis of Presentation" of the "Notes to Interim Consolidated Financial Statements" under Part I, Item 1 in this report.

Interim Consolidated Statement6

Interim Consolidated Statements of Stockholders' Equity - USD ($) $ in Thousands		Total		Common Stock	Additional Paid-in Capital	Retained Earnings	Accumulated Other Comprehensive Income (Loss)	Total SVBFG Stockholders’ Equity	Noncontrolling Interests
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Cumulative effective of adopting ASU 2014-01 | Accounting Standards Update 2014-01	[1]	$ (4,635)				$ (4,635)		$ (4,635)
Balance (in shares) (Previously Reported) at Dec. 31, 2013				45,800,418
Balance (in shares) at Dec. 31, 2013				45,800,418
Balance (Previously Reported) at Dec. 31, 2013		3,079,328		$ 46	$ 624,256	1,390,732	$ (48,764)	1,966,270	$ 1,113,058
Balance at Dec. 31, 2013		3,074,693		$ 46	624,256	1,386,097	(48,764)	1,961,635	1,113,058
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Common stock issued under employee benefit plans, net of restricted stock cancellations (in shares)				504,766
Common stock issued under employee benefit plans, net of restricted stock cancellations		13,878		$ 0	13,878			13,878
Common stock issued under ESOP (in shares)				30,762
Common stock issued under ESOP		3,890			3,890			3,890
Income tax benefit from stock options exercised, vesting of restricted stock and other		7,973			7,973			7,973
Net income	[1]	348,865	[2],[3],[4],[5]			205,880		205,880	142,985
Capital calls and distributions, net		(37,984)							(37,984)
Net change in unrealized gains and losses on available-for-sale securities, net of tax		47,758					47,758	47,758
Held-to-maturity securities, transferred securities, unrealized gains, net of tax		22,522					22,522	22,522
Amortization of unrealized gains on securities transferred from available-for-sale to held-to-maturity, net of tax		(2,415)					(2,415)	(2,415)
Foreign currency translation adjustments, net of tax		(357)					(357)	(357)
Common stock issued in public offering (in shares)				4,485,000
Common stock issued in public offering		434,866		$ 5	434,861	0		434,866
Share-based compensation expense		22,479			22,479			22,479
Balance (in shares) at Sep. 30, 2014	[1]			50,820,946
Balance at Sep. 30, 2014	[1]	3,936,168		$ 51	1,107,337	1,591,977	18,744	2,718,109	1,218,059
Balance (in shares) at Dec. 31, 2014	[1]			50,924,925
Balance at Dec. 31, 2014	[1]	4,051,734		$ 51	1,120,350	1,649,967	42,704	2,813,072	1,238,662
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Common stock issued under employee benefit plans, net of restricted stock cancellations (in shares)				536,635
Common stock issued under employee benefit plans, net of restricted stock cancellations		14,712			14,712			14,712
Common stock issued under ESOP (in shares)				27,425
Common stock issued under ESOP		3,512			3,512			3,512
Income tax benefit from stock options exercised, vesting of restricted stock and other		10,813			10,813			10,813
Deconsolidation of noncontrolling interest		(1,069,437)							(1,069,437)
Net income		284,811	[2],[3],[4],[5],[6]			256,392		256,392	28,419
Capital calls and distributions, net		(58,315)							(58,315)
Net change in unrealized gains and losses on available-for-sale securities, net of tax		57,605					57,605	57,605
Amortization of unrealized gains on securities transferred from available-for-sale to held-to-maturity, net of tax		(4,779)					(4,779)	(4,779)
Foreign currency translation adjustments, net of tax		1,534					1,534	1,534
Share-based compensation expense		22,262			22,262			22,262
Other, net		(224)			0	(224)		(224)
Balance (in shares) at Sep. 30, 2015				51,488,985
Balance at Sep. 30, 2015		$ 3,314,228		$ 51	$ 1,171,649	$ 1,906,135	$ 97,064	$ 3,174,899	$ 139,329
[1]	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 1— "Basis of Presentation" of the "Notes to Interim Consolidated Financial Statements" under Part I, Item 1 in this report.
[2]	Amounts for the nine months ended September 30, 2015, have been revised to reflect the retrospective application of new accounting guidance adopted in the second quarter of 2015 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 1— "Basis of Presentation” of the “Notes to Interim Consolidated Financial Statements (unaudited)” under Part I, Item 1 of this report for additional details.
[3]	Cash flows for the nine months ended September 30, 2015 were revised to reflect the adoption of ASU 2015-02 as of January 1, 2015 and cash flows for the nine months ended September 30, 2014 were revised to reflect the retrospective application of our adoption of ASU 2014-01.
[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 1— "Basis of Presentation" of the "Notes to Interim Consolidated Financial Statements" under Part I, Item 1 in this report.
[5]	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 1— "Basis of Presentation" of the "Notes to Interim Consolidated Financial Statements" under Part I, Item 1 in this report.
[6]	Amounts for the nine months ended September 30, 2015, have been revised to reflect the retrospective application of new accounting guidance adopted in the second quarter of 2015 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 1— "Basis of Presentation” of the “Notes to Interim Consolidated Financial Statements (unaudited)” under Part I, Item 1 of this report for additional details.

Interim Consolidated Statement7

Interim Consolidated Statements of Cash Flows - USD ($) $ in Thousands		9 Months Ended
		Sep. 30, 2015		Sep. 30, 2014
Cash flows from operating activities:
Net income before noncontrolling interests	[2],[3],[4],[5]	$ 284,811	[1]	$ 348,865	[6]
Adjustments to reconcile net income to net cash provided by operating activities:
Provision for loan losses		66,368	[1]	19,051
Provision for unfunded credit commitments		249	[1]	5,533
Changes in fair values of derivatives, net		(42,295)		2,028
Gains on investment securities, net		(77,006)	[1]	(172,236)
Depreciation and amortization	[3]	28,504		29,273
Amortization of premiums and discounts on investment securities, net		14,659		18,700
Amortization of share-based compensation		24,174		22,285
Amortization of deferred loan fees		(64,275)		(59,550)
Pre-tax net gain on SVBIF sale transaction		(1,287)		0
Deferred income tax expense (benefit)		3,131		(18,916)
Changes in other assets and liabilities:
Accrued interest receivable and payable, net		(6,312)		(17,488)
Accounts receivable and payable, net		(13,159)		(12,890)
Income tax payable and receivable, net	[3]	(29,398)		(14,234)
Accrued compensation		(7,702)		(24,241)
Foreign exchange spot contracts, net		7,522		97,357
Other, net		57,445		12,837
Net cash provided by operating activities		245,429		236,374
Cash flows from investing activities:
Purchases of available-for-sale securities		(2,911,486)		(8,060,750)
Proceeds from sales of available-for-sale securities		7,762		26,926
Proceeds from maturities and pay downs of available-for-sale securities		1,238,950		1,352,369
Purchases of held-to-maturity securities		(2,057,030)		(1,577,634)
Proceeds from maturities and pay downs of held-to-maturity securities		1,153,363		327,913
Purchases of non-marketable and other securities (cost and equity method accounting)		(15,856)		(47,923)
Proceeds from sales and distributions of non-marketable and other securities (cost and equity method accounting)		79,575		47,478
Purchases of non-marketable and other securities (fair value accounting)		(5,611)		(182,247)
Proceeds from sales and distributions of non-marketable and other securities (fair value accounting)		77,289		264,389
Net increase in loans		(911,694)		(1,103,447)
Proceeds from recoveries of charged-off loans		5,119		5,313
Effect of deconsolidation of noncontrolling interest		15,995		0
Purchases of premises and equipment		(37,465)		(29,332)
Net proceeds from SVBIF sale transaction (2)	[7]	39,284		0
Net cash used for investing activities		(3,321,805)		(8,976,945)
Cash flows from financing activities:
Net increase in deposits		2,626,379		8,650,156
Net (decrease) increase in short-term borrowings		(4,025)		1,550
Net distributions to noncontrolling interests		(58,315)		(37,984)
Tax benefit from stock exercises		10,813		7,973
Proceeds from issuance of common stock, ESPP, and ESOP		18,224		17,768
Net proceeds from public equity offering		0		434,866
Proceeds from issuance of 3.50% Senior Notes		346,431		0
Net cash provided by financing activities		2,939,507		9,074,329
Net (decrease) increase in cash and cash equivalents		(136,869)		333,758
Cash and cash equivalents at beginning of period		1,796,062		1,538,779	[3],[7]
Cash and cash equivalents at end of period		1,674,145		1,872,537	[3]
Cash and cash equivalents, including discontinued operations, at beginning of period	[3]	1,811,014
Cash and cash equivalents, including discontinued operations, at end of period	[3]	1,674,145
Cash paid during the period for:
Interest		62,129		30,259
Income taxes		182,479		154,746
Noncash items during the period:
Changes in unrealized gains and losses on available-for-sale securities, net of tax		57,605		47,758
Distributions of stock from investments		24,778		21,385
Transfers from available-for-sale securities to held-to-maturity		$ 0		$ 5,418,572
[1]	Amounts for the nine months ended September 30, 2015, have been revised to reflect the retrospective application of new accounting guidance adopted in the second quarter of 2015 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 1— "Basis of Presentation” of the “Notes to Interim Consolidated Financial Statements (unaudited)” under Part I, Item 1 of this report for additional details.
[2]	Amounts for the nine months ended September 30, 2015, have been revised to reflect the retrospective application of new accounting guidance adopted in the second quarter of 2015 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 1— "Basis of Presentation” of the “Notes to Interim Consolidated Financial Statements (unaudited)” under Part I, Item 1 of this report for additional details.
[3]	Cash flows for the nine months ended September 30, 2015 were revised to reflect the adoption of ASU 2015-02 as of January 1, 2015 and cash flows for the nine months ended September 30, 2014 were revised to reflect the retrospective application of our adoption of ASU 2014-01.
[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 1— "Basis of Presentation" of the "Notes to Interim Consolidated Financial Statements" under Part I, Item 1 in this report.
[5]	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 1— "Basis of Presentation" of the "Notes to Interim Consolidated Financial Statements" under Part I, Item 1 in this report.
[6]	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 1— "Basis of Presentation" of the "Notes to Interim Consolidated Financial Statements" under Part I, Item 1 in this report.
[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.

Interim Consolidated Statement8

Interim Consolidated Statements of Cash Flows (Parenthetical) - USD ($) $ in Thousands		9 Months Ended
		Sep. 30, 2015	Dec. 31, 2014
Cash and cash equivalents, including discontinued operations	[1]	$ 1,674,145	$ 1,811,014
Net proceeds from SVBIF sale transaction (2)	[2]	39,284
Assets held-for-sale, sales price		48,600
Assets held-for-sale, cash and cash equivalents included in sale		$ 9,300
Other assets
Cash and cash equivalents, including discontinued operations			$ 15,000
[1]	Cash flows for the nine months ended September 30, 2015 were revised to reflect the adoption of ASU 2015-02 as of January 1, 2015 and cash flows for the nine months ended September 30, 2014 were revised to reflect the retrospective application of our adoption of ASU 2014-01.
[2]	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.

Basis of Presentation

Basis of Presentation	9 Months Ended
	Sep. 30, 2015
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Basis of Presentation	Basis of Presentation SVB Financial Group is a diversified financial services company, as well as a bank holding company and financial holding company. SVB Financial was incorporated in the state of Delaware in March 1999. Through our various subsidiaries and divisions, we offer a variety of banking and financial products and services to support our clients of all sizes and stages throughout their life cycles. In these notes to our consolidated financial statements, when we refer to “SVB Financial Group,” “SVBFG”, the “Company,” “we,” “our,” “us” or use similar words, we mean SVB Financial Group and all of its subsidiaries collectively, including Silicon Valley Bank (the “Bank”), unless the context requires otherwise. When we refer to “SVB Financial” or the “Parent” we are referring only to the parent company, SVB Financial Group, unless the context requires otherwise. The accompanying unaudited interim consolidated financial statements reflect all adjustments of a normal and recurring nature that are, in the opinion of management, necessary to fairly present our financial position, results of operations and cash flows in accordance with GAAP. Such unaudited interim consolidated financial statements have been prepared in accordance with the instructions to Form 10-Q pursuant to the rules and regulations of the SEC. Certain information and footnote disclosures normally included in financial statements prepared in accordance with GAAP have been condensed or omitted pursuant to such rules and regulations. The results of operations for the three and nine months ended September 30, 2015 are not necessarily indicative of results to be expected for any future periods. These unaudited interim consolidated financial statements should be read in conjunction with our Annual Report on Form 10-K for the year ended December 31, 2014 (“ 2014 Form 10-K”). The preparation of unaudited interim consolidated financial statements in conformity with GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities, the disclosure of contingent assets and liabilities at the date of the financial statements, and the reported amounts of revenues and expenses during the reporting period. Actual results could differ from those estimates. Estimates may change as new information is obtained. Significant items that are subject to such estimates include measurements of fair value, the valuation of non-marketable securities, the valuation of equity warrant assets, the adequacy of the allowance for loan losses and reserve for unfunded credit commitments, and the recognition and measurement of income tax assets and liabilities. Principles of Consolidation and Presentation Prior to April 1, 2015, the Company’s consolidated financial statements included the accounts of SVB Financial Group and entities in which we had a controlling interest. The determination of whether we had controlling interest was based on consolidation principles prescribed by ASC Topic 810 and whether the controlling interest in an entity was a voting interest entity or a variable interest entity (“VIE”). However, during the three months ended June 30, 2015, we early adopted the provisions of ASU 2015-02, Amendments to the Consolidation Analysis (ASU 2015-02)(see "Adoption of New Accounting Standards" below), which simplifies consolidation accounting by reducing the number of consolidation models and changing various aspects of current GAAP, including certain consolidation criteria for variable interest entities. The new guidance eliminates the presumption that a general partner of a limited partnership arrangement should consolidate a limited partnership. The amendments to ASC Topic 810 in ASU 2015-02 modify the evaluation of whether limited partnerships and similar entities are VIEs or voting entities. With these changes, we determined that the majority of our investments in limited partnership arrangements are VIEs under the new guidance while these entities were typically voting interest entities under the prior guidance. ASU 2015-02 provided a single model for evaluating VIE entities for consolidation. VIEs are entities where investors lack sufficient equity at risk for the entity to finance its activities without additional subordinated financial support or equity investors, as a group, lack one of the following characteristics: (a) the power to direct the activities that most significantly impact the entity’s economic performance, (b) the obligation to absorb the expected losses of the entity, or (c) the right to receive the expected returns of the entity. We assess VIEs to determine if we are the primary beneficiary of a VIE. A primary beneficiary is defined as a variable interest holder that has a controlling financial interest. A controlling financial interest requires both: (a) power to direct the activities that most significantly impact the VIE’s economic performance, and (b) obligation to absorb losses or receive benefits of a VIE that could potentially be significant to a VIE. Under this analysis, we evaluate kick-out rights and other participating rights which could provide us a controlling financial interest. The primary beneficiary of a VIE is required to consolidate the VIE. ASU 2015-02 also changed how we evaluate fees paid to managers of our limited partnership investments. Under the new guidance, we exclude those fee arrangements that are not deemed to be variable interests from the analysis of our interests in our investments in VIEs and the determination of a primary beneficiary, if any. Our consolidated financial statements include the accounts of SVB Financial Group and consolidated entities. We consolidate voting entities in which we have control through voting interests. We determine whether we have a controlling financial interest in a VIE by determining if we have the power to direct the activities of the VIE that most significantly impact the entity’s economic performance and whether we have significant variable interests. Generally, we have significant variable interests if our commitments to a limited partnership investment represent a significant amount of the total commitments to the entity. We also evaluate the impact of related parties on our determination of variable interests in our consolidation conclusions. We consolidate VIEs in which we are the primary beneficiary based on a controlling financial interest. If we are not the primary beneficiary of a VIE, we record our pro-rata interests or our cost basis in the VIE, as appropriate, based on other accounting guidance within GAAP. All significant intercompany accounts and transactions with consolidated entities have been eliminated. We have not provided financial or other support during the periods presented to any VIE that we were not previously contractually required to provide. Adoption of New Accounting Standards In May 2015, the FASB issued a new accounting standard (ASU 2015-07, Fair Value Measurement (Topic 820)), which removes the requirement to categorize within the fair value hierarchy all investments for which fair value is measured using the net asset value per share practical expedient. The standard is required to be applied retrospectively to all periods presented. The guidance will be effective for fiscal years beginning after December 15, 2015, with early adoption permitted. We early adopted this guidance in the second quarter of 2015. The adoption of this guidance impacts our fair value disclosures and has no impact on our financial position, results of operations or stockholders' equity. In April 2015, the FASB issued a new accounting standard (ASU 2015-03, Interest- Imputation of Interest (Subtopic 835-30), which simplifies the presentation of debt issuance costs. The guidance will be effective for annual and quarterly periods beginning on January 1, 2016, with early adoption permitted. We early adopted this guidance in the third quarter of 2015 using the retrospective method, which required the restatement of prior period results. The adoption of this guidance impacted our statement of financial position, but had no impact on our results of operations or retained earnings. We reclassified $5.1 million and $2.1 million of debt issuance costs from other assets to a direct deduction from the carrying amounts of long-term debt for the periods ended September 30, 2015, and December 31, 2014, respectively. In February 2015, the FASB issued a new accounting standard, ASU 2015-02, which amends the consolidation requirement for certain legal entities. As outlined above in "Principles of Consolidation and Presentation", we early adopted this guidance in the second quarter of 2015 using the modified retrospective method, which results in an effective date of adoption of January 1, 2015 and will not require the restatement of prior period results. The adoption of this guidance impacted our statement of financial position and results of operations, but had no impact on retained earnings, SVBFG stockholders' equity or net income as investments that were consolidated in previous reporting periods are now deconsolidated and no new investments were consolidated. Refer to Note 4—”Variable Interest Entities” of the “Notes to Interim Consolidated Financial Statements (unaudited)” under Part I, Item 1 of this report for additional details regarding our assessment of the adoption of this guidance. In January 2014, the FASB issued a new accounting standard (ASU 2014-01, Investments - Equity Method and Joint Ventures (Topic 323), Accounting for Investments in Qualified Affordable Housing Projects), which is effective for us for interim and annual reporting periods beginning after December 15, 2014. The standard is required to be applied retrospectively, with an adjustment to retained earnings in the earliest period presented. The ASU is applicable to our portfolio of low income housing tax credit ("LIHTC") partnership interests. We adopted this guidance in the first quarter of 2015. For prior periods, pursuant to ASU 2014-01, (i) amortization expense related to our low income housing tax credits was reclassified from Other noninterest expense to Income tax expense, (ii) additional amortization, net of the associated tax benefits, was recognized in Income tax expense as a result of our adoption of the proportional amortization method and (iii) net deferred tax assets, related to our low income housing tax investments, were written-off. The cumulative effect to retained earnings as of January 1, 2015 of adopting this guidance was a reduction of $4.7 million , inclusive of a $4.6 million reduction to retained earnings as of January 1, 2014. Our previously reported net income and diluted earnings per share for the three and nine months ended September 30, 2014 were not materially impacted by the adoption of ASU 2014-01. Recent Accounting Pronouncements In May 2014, the FASB issued a new accounting standard (ASU 2014-09, Revenue from Contracts with Customers (Topic 606)), which provides revenue recognition guidance that is intended to create greater consistency with respect to how and when revenue from contracts with customers is shown in the income statement. This guidance will be effective on a retrospective basis beginning on January 1, 2018. We do not expect the adoption of this guidance to have a material impact on our financial position, results of operations or stockholders' equity. In August 2014, the FASB issued a new accounting standard (ASU 2014-15, Going Concern (Topic 205-40)), which requires management to evaluate for each annual and interim reporting period whether there is substantial doubt about an entity's ability to continue as a going concern. The guidance will be effective for annual and quarterly periods beginning on or after December 15, 2016, with early adoption permitted. We are currently developing processes and controls to adopt this guidance by the adoption deadline and do not expect the adoption of this guidance to have a material impact on our financial position, results of operations or stockholders' equity. Reclassifications Certain prior period amounts, including amounts related to the adoption of ASU 2014-01, ASU 2015-02 and ASU 2015-03, have been reclassified to conform to current period presentations.

Stockholders' Equity and EPS

Stockholders' Equity and EPS	9 Months Ended
	Sep. 30, 2015
Equity and Earnings Per Share [Abstract]
Stockholders' Equity and EPS	Stockholders’ Equity and EPS Accumulated Other Comprehensive Income The following table summarizes the items reclassified out of accumulated other comprehensive income into the Consolidated Statements of Income (unaudited) for the three and nine months ended September 30, 2015 and 2014 : Three months ended September 30, Nine months ended September 30, (Dollars in thousands) Income Statement Location 2015 2014 2015 2014 Reclassification adjustment for (gains) losses included in net income Gains (losses) on investment securities, net $ (13 ) $ 990 $ (2,750 ) $ 17,411 Related tax expense (benefit) Income tax expense 6 (400 ) 1,111 (7,030 ) Total reclassification adjustment for (gains) losses included in net income, net of tax $ (7 ) $ 590 $ (1,639 ) $ 10,381 EPS Basic EPS is the amount of earnings available to each share of common stock outstanding during the reporting period. Diluted EPS is the amount of earnings available to each share of common stock outstanding during the reporting period adjusted to include the effect of potentially dilutive common shares. Potentially dilutive common shares include incremental shares issued for stock options and restricted stock units outstanding under our equity incentive plans and our ESPP. Potentially dilutive common shares are excluded from the computation of dilutive EPS in periods in which the effect would be antidilutive. The following is a reconciliation of basic EPS to diluted EPS for the three and nine months ended September 30, 2015 and 2014 : Three months ended September 30, Nine months ended September 30, (Dollars and shares in thousands, except per share amounts) 2015 2014 2015 2014 Numerator: Net income available to common stockholders (1) $ 81,733 $ 63,977 $ 256,392 $ 205,880 Denominator: Weighted average common shares outstanding-basic 51,479 50,752 51,254 48,281 Weighted average effect of dilutive securities: Stock options and ESPP 382 534 411 580 Restricted stock units 187 285 213 339 Denominator for diluted calculation 52,048 51,571 51,878 49,200 Earnings per common share: Basic (1) $ 1.59 $ 1.26 $ 5.00 $ 4.26 Diluted $ 1.57 $ 1.24 $ 4.94 $ 4.18 (1) 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 1— "Basis of Presentation" of the "Notes to Interim Consolidated Financial Statements" under Part I, Item 1 in this report. The following table summarizes the weighted-average common shares excluded from the diluted EPS calculation as they were deemed to be antidilutive for the three and nine months ended September 30, 2015 and 2014 : Three months ended September 30, Nine months ended September 30, (Shares in thousands) 2015 2014 2015 2014 Stock options 142 241 169 140 Restricted stock units 1 1 — 2 Total 143 242 169 142

Share-Based Compensation

Share-Based Compensation	9 Months Ended
	Sep. 30, 2015
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Share-Based Compensation	Share-Based Compensation For the three and nine months ended September 30, 2015 and 2014 , we recorded share-based compensation and related tax benefits as follows: Three months ended September 30, Nine months ended September 30, (Dollars in thousands) 2015 2014 2015 2014 Share-based compensation expense $ 8,188 $ 7,520 $ 24,174 $ 22,285 Income tax benefit related to share-based compensation expense (3,051 ) (2,676 ) (8,381 ) (7,351 ) Unrecognized Compensation Expense As of September 30, 2015 , unrecognized share-based compensation expense was as follows: (Dollars in thousands) Unrecognized Expense Average Expected Recognition Period - in Years Stock options $ 12,756 2.45 Restricted stock units 41,726 2.64 Total unrecognized share-based compensation expense $ 54,482 Share-Based Payment Award Activity The table below provides stock option information related to the 2006 Equity Incentive Plan for the nine months ended September 30, 2015 : Options Weighted Average Exercise Price Weighted Average Remaining Contractual Life in Years Aggregate Intrinsic Value of In-The- Money Options Outstanding at December 31, 2014 1,394,888 $ 66.03 Granted 122,120 129.30 Exercised (311,575 ) 51.34 Forfeited (22,008 ) 84.40 Expired (1,520 ) 48.76 Outstanding at September 30, 2015 1,181,905 76.12 4.00 $ 48,295,069 Vested and expected to vest at September 30, 2015 1,145,732 75.24 3.95 47,717,566 Exercisable at September 30, 2015 656,191 60.34 3.01 36,230,256 The aggregate intrinsic value of outstanding options shown in the table above represents the pretax intrinsic value based on our closing stock price of $115.54 as of September 30, 2015 . The total intrinsic value of options exercised during the three and nine months ended September 30, 2015 was $2.2 million and $24.0 million , respectively, compared to $7.7 million and $18.4 million for the comparable 2014 periods. The table below provides information for restricted stock units under the 2006 Equity Incentive Plan for the nine months ended September 30, 2015 : Shares Weighted Average Grant Date Fair Value Nonvested at December 31, 2014 614,666 $ 79.92 Granted 231,205 129.22 Vested (211,652 ) 74.02 Forfeited (19,292 ) 88.51 Nonvested at September 30, 2015 614,927 101.01

Variable Interest Entities

Variable Interest Entities	9 Months Ended
	Sep. 30, 2015
Investments In Variable Interest Entities [Abstract]
Variable Interest Entities	Variable Interest Entities Our involvement with VIEs includes our investments in venture capital and private equity funds, debt funds, private and public portfolio companies and our investments in qualified affordable housing projects. The following table presents the carrying amounts and classification of significant variable interests in consolidated and unconsolidated VIEs as of September 30, 2015: (Dollars in thousands) Consolidated VIEs Unconsolidated VIEs (1) Maximum Exposure to Loss in Unconsolidated VIEs September 30, 2015: Assets: Cash and cash equivalents $ 18,769 $ — $ — Non-marketable and other securities (2) 204,555 341,065 341,065 Accrued interest receivable and other assets 375 — — Total assets $ 223,699 $ 341,065 $ 341,065 Liabilities: Other liabilities 421 — — Accrued expenses and other liabilities (2) — 65,305 — Total liabilities $ 421 $ 65,305 $ — (1) During the second quarter of 2015 we adopted ASU 2015-02 and certain previously consolidated VIEs are no longer included in our Consolidated Balance Sheet. We applied the accounting guidance as of the beginning of the fiscal year of adoption, January 1, 2015. Upon adoption, we deconsolidated 16 entities, which reduced our total assets and total equity (which includes total SVBFG stockholders' equity plus noncontrolling interests) by $1.1 billion and $1.2 billion , respectively, primarily as a result of the reduction of our non-marketable and other securities and noncontrolling interests, respectively. SVB Financial continues to consolidate its interest in five SVB Capital funds that meet the new consolidated criteria. (2) Included in our non-marketable and other securities portfolio are investments in qualified affordable housing projects of $125.5 million and related unfunded commitments of $65.3 million . Non-marketable and other securities Our non-marketable and other securities portfolio primarily represents investments in venture capital and private equity funds, debt funds, private and public portfolio companies and investments in qualified affordable housing projects. A majority of these investments are through third party funds held by SVB Financial in which we do not have controlling or significant variable interests. These investments represent our unconsolidated VIEs in the table above. Our non-marketable and other securities portfolio also includes investments from SVB Capital. SVB Capital is the venture capital investment arm of SVB Financial, which focuses primarily on funds management. The SVB Capital family of funds is comprised of direct venture funds that invest in companies and funds of funds that invest in other venture capital funds. We have a controlling and significant variable interest in five of these SVB Capital funds and consolidate these funds for financial reporting purposes. All investments are generally nonredeemable and distributions are expected to be received through the liquidation of the underlying investments throughout the life of the investment fund. Investments may be sold or transferred subject to the notice and approval provisions of the underlying investment agreement. Subject to applicable regulatory requirements, including the Volcker Rule, we also make commitments to invest in venture capital and private equity funds, but are not obligated to fund commitments beyond our initial investment. For additional details, see Note 13—"Off-Balance Sheet Arrangements, Guarantees, and Other Commitments" of the "Notes to Interim Consolidated Financial Statements (unaudited)" under Part I, Item 1 of this report. The Bank also has variable interests in low income housing tax credit funds that are designed to generate a return primarily through the realization of federal tax credits. These investments are typically limited partnerships in which the general partner, other than the Bank, holds the power over significant activities of the VIE. We have not consolidated these investments in accordance with the new guidelines in ASU 2015-02. For additional information on our investments in qualified affordable housing projects see Note 6—“Investment Securities" of the "Notes to Interim Consolidated Financial Statements" under Part I, Item 1 of this report. As of September 30, 2015, our exposure to loss with respect to the consolidated VIEs is limited to our net assets of $223.3 million and our exposure to loss for our unconsolidated VIEs is equal to our investment in these assets of $341.1 million .

Cash and Cash Equivalents

Cash and Cash Equivalents	9 Months Ended
	Sep. 30, 2015
Cash and Cash Equivalents [Abstract]
Cash and Cash Equivalents	Cash and Cash Equivalents The following table details our cash and cash equivalents at September 30, 2015 and December 31, 2014 : (Dollars in thousands) September 30, 2015 December 31, 2014 Cash and due from banks (1) $ 1,454,538 $ 1,694,329 Securities purchased under agreements to resell (2) 214,484 95,611 Other short-term investment securities 5,123 6,122 Total cash and cash equivalents $ 1,674,145 $ 1,796,062 (1) At September 30, 2015 and December 31, 2014 , $639 million and $861 million , respectively, of our cash and due from banks was deposited at the Federal Reserve Bank and was earning interest at the Federal Funds target rate, and interest-earning deposits in other financial institutions were $429 million and $440 million , respectively. (2) At September 30, 2015 and December 31, 2014 , securities purchased under agreements to resell were collateralized by U.S. Treasury securities and U.S. agency securities with aggregate fair values of $219 million and $98 million , respectively. None of these securities received as collateral were sold or pledged as of September 30, 2015 or December 31, 2014 .

Investment Securities

Investment Securities	9 Months Ended
	Sep. 30, 2015
Investments, Debt and Equity Securities [Abstract]
Investment Securities	Investment Securities Our investment securities portfolio consists of i) an available-for-sale securities portfolio and a held-to-maturity securities portfolio, both of which represent interest-earning investment securities, and ii) a non-marketable and other securities portfolio, which primarily represents investments managed as part of our funds management business. Available-for-Sale Securities The components of our available-for-sale investment securities portfolio at September 30, 2015 and December 31, 2014 are as follows: September 30, 2015 (Dollars in thousands) Amortized Cost Unrealized Gains Unrealized Losses Carrying Value Available-for-sale securities, at fair value: U.S. treasury securities $ 10,103,580 $ 93,458 $ (13 ) $ 10,197,025 U.S. agency debentures 2,902,479 40,502 (13 ) 2,942,968 Residential mortgage-backed securities: Agency-issued collateralized mortgage obligations—fixed rate 1,513,691 10,652 (6,641 ) 1,517,702 Agency-issued collateralized mortgage obligations—variable rate 641,057 4,231 — 645,288 Equity securities 6,426 216 (1,964 ) 4,678 Total available-for-sale securities $ 15,167,233 $ 149,059 $ (8,631 ) $ 15,307,661 December 31, 2014 (Dollars in thousands) Amortized Cost Unrealized Gains Unrealized Losses Carrying Value Available-for-sale securities, at fair value: U.S. treasury securities $ 7,289,135 $ 17,524 $ (4,386 ) $ 7,302,273 U.S. agency debentures 3,540,055 30,478 (8,977 ) $ 3,561,556 Residential mortgage-backed securities: Agency-issued collateralized mortgage obligations—fixed rate 1,884,450 14,851 (14,458 ) 1,884,843 Agency-issued collateralized mortgage obligations—variable rate 779,103 5,372 — 784,475 Equity securities 5,202 2,628 (322 ) 7,508 Total available-for-sale securities $ 13,497,945 $ 70,853 $ (28,143 ) $ 13,540,655 The following table summarizes our unrealized losses on our available-for-sale securities portfolio into categories of less than 12 months and 12 months or longer as of September 30, 2015 : September 30, 2015 Less than 12 months 12 months or longer Total (Dollars in thousands) Fair Value of Investments Unrealized Losses Fair Value of Investments Unrealized Losses Fair Value of Investments Unrealized Losses Available-for-sale securities: U.S. treasury securities $ 51,576 $ (13 ) $ — $ — $ 51,576 $ (13 ) U.S. agency debentures 17,424 (13 ) — — 17,424 (13 ) Residential mortgage-backed securities: Agency-issued collateralized mortgage obligations—fixed rate 230,141 (465 ) 396,781 (6,176 ) 626,922 (6,641 ) Equity securities 3,222 (1,964 ) 3,222 (1,964 ) Total temporarily impaired securities: (1) $ 302,363 $ (2,455 ) $ 396,781 $ (6,176 ) $ 699,144 $ (8,631 ) (1) As of September 30, 2015 , we identified a total of 43 investments that were in unrealized loss positions, of which 18 investments totaling $396.8 million with unrealized losses of $6.2 million have been in an impaired position for a period of time greater than 12 months. As of September 30, 2015 , we do not intend to sell any impaired fixed income investment securities prior to recovery of our adjusted cost basis, and it is more likely than not that we will not be required to sell any of our securities prior to recovery of our adjusted cost basis. Based on our analysis as of September 30, 2015 , we deem all impairments to be temporary, and therefore changes in value for our temporarily impaired securities as of the same date are included in other comprehensive income. Market valuations and impairment analyses on assets in the available-for-sale securities portfolio are reviewed and monitored on a quarterly basis. The following table summarizes our unrealized losses on our available-for-sale securities portfolio into categories of less than 12 months and 12 months or longer as of December 31, 2014 : December 31, 2014 Less than 12 months 12 months or longer Total (Dollars in thousands) Fair Value of Investments Unrealized Losses Fair Value of Investments Unrealized Losses Fair Value of Investments Unrealized Losses Available-for-sale securities: U.S. treasury securities $ 2,297,895 $ (4,386 ) $ — $ — $ 2,297,895 $ (4,386 ) U.S. agency debentures 249,266 (489 ) 507,385 (8,488 ) 756,651 (8,977 ) Residential mortgage-backed securities: Agency-issued collateralized mortgage obligations—fixed rate 662,092 (3,104 ) 453,801 (11,354 ) 1,115,893 (14,458 ) Equity securities 568 (322 ) — — 568 (322 ) Total temporarily impaired securities (1): $ 3,209,821 $ (8,301 ) $ 961,186 $ (19,842 ) $ 4,171,007 $ (28,143 ) (1) As of December 31, 2014, we identified a total of 115 investments that were in unrealized loss positions, of which 33 investments totaling $961.2 million with unrealized losses of $19.8 million have been in an impaired position for a period of time greater than 12 months. The following table summarizes the remaining contractual principal maturities and fully taxable equivalent yields on fixed income investment securities classified as available-for-sale as of September 30, 2015 . The weighted average yield is computed using the amortized cost of fixed income investment securities, which are reported at fair value. For U.S. treasury securities and U.S. Agency debentures, the expected maturity is the actual contractual maturity of the notes. Expected maturities for mortgage-backed securities may differ significantly from their contractual maturities because mortgage borrowers have the right to prepay outstanding loan obligations with or without penalties. Mortgage-backed securities classified as available-for-sale typically have original contractual maturities from 10 to 30 years whereas expected average lives of these securities tend to be significantly shorter and vary based upon structure and prepayments in lower rate environments. September 30, 2015 Total One Year or Less After One Year to Five Years After Five Years to Ten Years After Ten Years (Dollars in thousands) Carrying Value Weighted- Average Yield Carrying Value Weighted- Average Yield Carrying Value Weighted- Average Yield Carrying Value Weighted- Average Yield Carrying Value Weighted- Average Yield U.S. treasury securities $ 10,197,025 1.16 % $ 953,659 0.45 % $ 8,806,490 1.20 % $ 436,876 1.75 % $ — — % U.S. agency debentures 2,942,968 1.63 821,073 1.73 1,971,243 1.53 150,652 2.49 — — Residential mortgage-backed securities: Agency-issued collateralized mortgage obligations - fixed rate 1,517,702 1.96 — — — — 570,403 2.50 947,299 1.65 Agency-issued collateralized mortgage obligations - variable rate 645,288 0.71 — — — — — — 645,288 0.71 Total $ 15,302,983 1.31 $ 1,774,732 1.04 $ 10,777,733 1.26 $ 1,157,931 2.21 $ 1,592,587 1.27 Held-to-Maturity Securities The components of our held-to-maturity investment securities portfolio at September 30, 2015 and December 31, 2014 are as follows: September 30, 2015 (Dollars in thousands) Amortized Cost Unrealized Gains Unrealized Losses Fair Value Held-to-maturity securities, at cost: U.S. agency debentures (1) $ 545,753 $ 11,923 $ — $ 557,676 Residential mortgage-backed securities: Agency-issued mortgage-backed securities 2,457,328 18,925 (1,005 ) 2,475,248 Agency-issued collateralized mortgage obligations—fixed rate 4,045,172 24,146 (5,372 ) 4,063,946 Agency-issued collateralized mortgage obligations—variable rate 109,478 577 — 110,055 Agency-issued commercial mortgage-backed securities 1,073,160 12,449 (309 ) 1,085,300 Municipal bonds and notes 75,635 36 (893 ) 74,778 Total held-to-maturity securities $ 8,306,526 $ 68,056 $ (7,579 ) $ 8,367,003 (1) Consists of pools of Small Business Investment Company debentures issued and guaranteed by the U.S. Small Business Administration, an independent agency of the United States. December 31, 2014 (Dollars in thousands) Amortized Unrealized Unrealized Fair Value Held-to-maturity securities, at cost: U.S. agency debentures (1) $ 405,899 $ 4,589 $ (38 ) $ 410,450 Residential mortgage-backed securities: Agency-issued mortgage-backed securities 2,799,923 5,789 (2,320 ) 2,803,392 Agency-issued collateralized mortgage obligations—fixed rate 3,185,109 4,521 (14,885 ) 3,174,745 Agency-issued collateralized mortgage obligations—variable rate 131,580 371 — 131,951 Agency-issued commercial mortgage-backed securities 814,589 1,026 (3,800 ) 811,815 Municipal bonds and notes 83,942 18 (657 ) 83,303 Total held-to-maturity securities $ 7,421,042 $ 16,314 $ (21,700 ) $ 7,415,656 (1) Consists of pools of Small Business Investment Company debentures issued and guaranteed by the U.S. Small Business Administration, an independent agency of the United States. The following table summarizes our unrealized losses on our held-to-maturity securities portfolio into categories of less than 12 months and 12 months or longer as of September 30, 2015 : September 30, 2015 Less than 12 months 12 months or longer Total (Dollars in thousands) Fair Value of Investments Unrealized Losses Fair Value of Investments Unrealized Losses Fair Value of Investments Unrealized Losses Held-to-maturity securities: Residential mortgage-backed securities: Agency-issued mortgage-backed securities $ 308,687 $ (438 ) $ 23,732 $ (567 ) $ 332,419 $ (1,005 ) Agency-issued collateralized mortgage obligations—fixed rate 705,362 (5,264 ) 8,945 (108 ) 714,307 (5,372 ) Agency-issued commercial mortgage-backed securities — — 42,179 (309 ) 42,179 (309 ) Municipal bonds and notes 29,712 (235 ) 32,706 (658 ) 62,418 (893 ) Total temporarily impaired securities (1): $ 1,043,761 $ (5,937 ) $ 107,562 $ (1,642 ) $ 1,151,323 $ (7,579 ) (1) As of September 30, 2015 , we identified a total of 157 investments that were in unrealized loss positions, 63 of which have been in an impaired position for a period of time greater than 12 months. As of September 30, 2015 , we do not intend to sell any impaired fixed income investment securities prior to recovery of our adjusted cost basis, and it is more likely than not that we will not be required to sell any of our securities prior to recovery of our adjusted cost basis, which is consistent with our classification of these securities. Based on our analysis as of September 30, 2015 , we deem all impairments to be temporary. Market valuations and impairment analyses on assets in the held-to-maturity securities portfolio are reviewed and monitored on a quarterly basis. The following table summarizes our unrealized losses on our held-to-maturity securities portfolio into categories of less than 12 months and 12 months or longer as of December 31, 2014 : December 31, 2014 Less than 12 months 12 months or longer (1) Total (Dollars in thousands) Fair Value of Unrealized Fair Value of Unrealized Fair Value of Unrealized Held-to-maturity securities: U.S. agency debentures $ 48,335 $ (38 ) $ — $ — $ 48,335 $ (38 ) Residential mortgage-backed securities: Agency-issued mortgage-backed securities 999,230 (2,320 ) — — 999,230 (2,320 ) Agency-issued collateralized mortgage obligations—fixed rate 1,682,348 (9,705 ) 783,558 (5,180 ) 2,465,906 (14,885 ) Agency-issued commercial mortgage-backed securities 629,840 (3,800 ) — — 629,840 (3,800 ) Municipal bonds and notes 79,141 (657 ) — — 79,141 (657 ) Total temporarily impaired securities (2): $ 3,438,894 $ (16,520 ) $ 783,558 $ (5,180 ) $ 4,222,452 $ (21,700 ) (1) Represents securities in an unrealized loss position for twelve months or longer in which the amortized cost basis was re-set for those securities re-designated from AFS to HTM effective June 1, 2014. (2) As of December 31, 2014, we identified a total of 292 investments that were in unrealized loss positions, of which 26 investments totaling $783.6 million with unrealized losses of $5.2 million have been in an impaired position for a period of time greater than 12 months. The following table summarizes the remaining contractual principal maturities and fully taxable equivalent yields on fixed income investment securities classified as held-to-maturity as of September 30, 2015 . Interest income on certain municipal bonds and notes (non-taxable investments) are presented on a fully taxable equivalent basis using the federal statutory tax rate of 35% . The weighted average yield is computed using the amortized cost of fixed income investment securities. For U.S. Agency debentures, the expected maturity is the actual contractual maturity of the notes. Expected maturities for mortgage-backed securities may differ significantly from their contractual maturities because mortgage borrowers have the right to prepay outstanding loan obligations with or without penalties. Mortgage-backed securities classified as held-to-maturity typically have original contractual maturities from 10 to 30 years whereas expected average lives of these securities tend to be significantly shorter and vary based upon structure and prepayments in lower rate environments. September 30, 2015 Total One Year or Less After One Year to Five Years After Five Years to Ten Years After Ten Years (Dollars in thousands) Amortized Cost Weighted- Average Yield Amortized Cost Weighted- Average Yield Amortized Cost Weighted- Average Yield Amortized Cost Weighted- Average Yield Amortized Cost Weighted- Average Yield U.S. agency debentures $ 545,753 2.69 % — % $ — — % $ 545,753 2.69 % $ — — % Residential mortgage-backed securities: Agency-issued mortgage-backed securities 2,457,328 2.43 — — 39,527 2.38 674,584 2.20 1,743,217 2.52 Agency-issued collateralized mortgage obligations - fixed rate 4,045,172 1.70 — — — — — — 4,045,172 1.70 Agency-issued collateralized mortgage obligations - variable rate 109,478 0.65 — — — — — — 109,478 0.65 Agency-issued commercial mortgage-backed securities 1,073,160 2.12 — — — — — — 1,073,160 2.12 Municipal bonds and notes 75,635 6.05 4,711 5.58 29,083 5.95 35,698 6.14 6,143 6.35 Total $ 8,306,526 2.06 $ 4,711 5.58 $ 68,610 3.89 $ 1,256,035 2.53 $ 6,977,170 1.95 Non-marketable and Other Securities The components of our non-marketable and other investment securities portfolio at September 30, 2015 and December 31, 2014 are as follows: (Dollars in thousands) September 30, 2015 December 31, 2014 Non-marketable and other securities (1): Non-marketable securities (fair value accounting): Venture capital and private equity fund investments (2) $ 154,660 $ 1,130,882 Other venture capital investments (3) 3,390 71,204 Other securities (fair value accounting) (4) 779 108,251 Non-marketable securities (equity method accounting) (5): Venture capital and private equity fund investments 84,197 — Debt funds 21,217 26,672 Other investments 119,731 116,002 Non-marketable securities (cost method accounting): Venture capital and private equity fund investments (6) 123,550 140,551 Other investments (7) 17,499 13,423 Investments in qualified affordable housing projects, net (7) 125,532 121,155 Total non-marketable and other securities $ 650,555 $ 1,728,140 (1) During the second quarter of 2015 we adopted new accounting guidance related to our consolidated variable interest entities (ASU 2015-02) under a modified retrospective approach. Periods prior to January 1, 2015 have not been revised. See Note 1— "Basis of Presentation” and Note 4— "Variable Interest Entities" of the “Notes to Interim Consolidated Financial Statements (unaudited)” under Part I, Item 1 of this report for additional details regarding our non-marketable and other securities. (2) The following table shows the amounts of venture capital and private equity fund investments held by the following funds and our ownership percentage of each fund at September 30, 2015 and December 31, 2014 (fair value accounting): September 30, 2015 December 31, 2014 (Dollars in thousands) Amount Ownership % Amount Ownership % SVB Strategic Investors Fund, LP $ 23,229 12.6 % $ 24,645 12.6 % SVB Strategic Investors Fund II, LP (i) — — 97,250 8.6 SVB Strategic Investors Fund III, LP (i) — — 269,821 5.9 SVB Strategic Investors Fund IV, LP (i) — — 291,291 5.0 Strategic Investors Fund V Funds (i) — — 226,111 Various Strategic Investors Fund VI Funds (i) — — 89,605 — SVB Capital Preferred Return Fund, LP 61,869 20.0 62,110 20.0 SVB Capital—NT Growth Partners, LP 62,818 33.0 61,973 33.0 SVB Capital Partners II, LP (i) — — 302 5.1 Other private equity fund (ii) 6,744 58.2 7,774 58.2 Total venture capital and private equity fund investments $ 154,660 $ 1,130,882 (i) Funds were deconsolidated during the second quarter of 2015 upon adoption of ASU 2015-02 and are now reported under equity method accounting. Periods prior to January 1, 2015 have not been revised. See Note 1— "Basis of Presentation” of the “Notes to Interim Consolidated Financial Statements (unaudited)” under Part I, Item 1 of this report for additional details. (ii) At September 30, 2015 , we had a direct ownership interest of 41.5 percent in other private equity funds and an indirect ownership interest of 12.6 percent through our ownership interest of SVB Capital—NT Growth Partners, LP and an indirect ownership interest of 4.1 percent through our ownership interest of SVB Capital Preferred Return Fund, LP. (3) The following table shows the amounts of other venture capital investments held by the following funds and our ownership percentage of each fund at September 30, 2015 and December 31, 2014 (fair value accounting): September 30, 2015 December 31, 2014 (Dollars in thousands) Amount Ownership % Amount Ownership % Silicon Valley BancVentures, LP $ 3,390 10.7 % $ 3,291 10.7 % SVB Capital Partners II, LP (i) — — 20,481 5.1 Capital Partners III, LP (i) — — 41,055 — SVB Capital Shanghai Yangpu Venture Capital Fund (i) — — 6,377 6.8 Total other venture capital investments $ 3,390 $ 71,204 (i) Funds were deconsolidated during the second quarter of 2015 upon adoption of ASU 2015-02 and are now reported under equity method accounting, within "Other venture capital and private equity fund investments". Periods prior to January 1, 2015 have not been revised. See Note 1— "Basis of Presentation” of the “Notes to Interim Consolidated Financial Statements (unaudited)” under Part I, Item 1 of this report for additional details. (4) Investments classified as other securities (fair value accounting) represent direct equity investments in public companies held by our consolidated funds. At December 31, 2014 , the amount primarily included total unrealized gains in one public company, FireEye, Inc. ("FireEye") that were realized during the first quarter of 2015. Funds were deconsolidated during the second quarter of 2015 upon adoption of ASU 2015-02. See Note 1— "Basis of Presentation” of the “Notes to Interim Consolidated Financial Statements (unaudited)” under Part I, Item 1 of this report for additional details. (5) The following table shows the carrying value and our ownership percentage of each investment at September 30, 2015 and December 31, 2014 (equity method accounting): September 30, 2015 December 31, 2014 (Dollars in thousands) Amount Ownership % Amount Ownership % Venture capital and private equity fund investments: SVB Strategic Investors Fund II, LP (i) $ 11,204 8.6 % $ — — % SVB Strategic Investors Fund III, LP (i) 24,781 5.9 — — SVB Strategic Investors Fund IV, LP (i) 25,542 5.0 — — Other venture capital and private equity fund investments (i) 22,670 Various — — Total venture capital and private equity fund investments 84,197 — Debt funds: Gold Hill Capital 2008, LP (ii) $ 17,662 15.5 $ 21,294 15.5 Other debt funds 3,555 Various 5,378 Various Total debt funds 21,217 26,672 Other investments: China Joint Venture investment 79,299 50.0 79,569 50.0 Other investments 40,432 Various 36,433 Various Total other investments $ 119,731 $ 116,002 (i) Represents funds previously consolidated and reported under fair value accounting in (2) above prior to adoption of ASU 2015-02 during the second quarter of 2015. Periods prior to January 1, 2015 have not been revised. See Note 1— "Basis of Presentation” of the “Notes to Interim Consolidated Financial Statements (unaudited)” under Part I, Item 1 of this report for additional details. (ii) At September 30, 2015 , we had a direct ownership interest of 11.5 percent in the fund and an indirect interest in the fund through our investment in Gold Hill Capital 2008, LLC of 4.0 percent . (6) Represents investments in 270 and 281 funds (primarily venture capital funds) at September 30, 2015 and December 31, 2014 , respectively, where our ownership interest is typically less than 5% of the voting interests of each such fund and in which we do not have the ability to exercise significant influence over the partnerships operating activities and financial policies. The carrying value, and estimated fair value, of these venture capital and private equity fund investments (cost method accounting) was $124 million and $244 million , respectively, as of September 30, 2015 . The carrying value, and estimated fair value, of these venture capital and private equity fund investments (cost method accounting) was $141 million and $234 million , respectively, as of December 31, 2014 . (7) 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 1— "Basis of Presentation" of the "Notes to Interim Consolidated Financial Statements" under Part I, Item 1 in this report. The following table presents the balances of our investments in qualified affordable housing projects and related unfunded commitments at September 30, 2015 and December 31, 2014 : (Dollars in thousands) September 30, 2015 December 31, 2014 Investments in qualified affordable housing projects, net $ 125,532 $ 121,155 Accrued expenses and other liabilities 65,305 65,921 The following table presents other information relating to our investments in qualified affordable housing projects for the three and nine months ended September 30, 2015 and 2014 : Three months ended September 30, Nine months ended September 30, (Dollars in thousands) 2015 2014 2015 2014 Tax credits and other tax benefits recognized $ 4,780 $ 3,087 $ 11,207 $ 9,312 Amortization expense included in provision for income taxes (i) 2,011 1,246 7,549 5,971 (i) All investments are amortized using the proportional amortization method and are included in provision for income taxes. The following table presents the components of gains and losses (realized and unrealized) on investment securities for the three and nine months ended September 30, 2015 and 2014 : Three months ended September 30, Nine months ended September 30, (Dollars in thousands) 2015 2014 2015 2014 Gross gains on investment securities: Available-for-sale securities, at fair value (1) $ 46 $ 45 $ 2,971 $ 642 Non-marketable securities (fair value accounting): Venture capital and private equity fund investments 6,746 69,044 24,767 268,483 Other venture capital investments 15 6,779 198 11,334 Other securities (fair value accounting) 40 5,444 9,108 136,010 Non-marketable securities (equity method accounting): Venture capital and private equity fund investments 7,655 275 22,111 1,284 Debt funds 379 1,037 2,067 4,076 Other investments 1,282 927 2,147 3,635 Non-marketable securities (cost method accounting): Venture capital and private equity fund investments 5,624 2,641 21,101 7,706 Other investments — 19 576 5,174 Total gross gains on investment securities 21,787 86,211 85,046 438,344 Gross losses on investment securities: Available-for-sale securities, at fair value (1) (33 ) (1,035 ) (221 ) (18,052 ) Non-marketable securities (fair value accounting): Venture capital and private equity fund investments (1,148 ) (25,584 ) (2,695 ) (76,243 ) Other venture capital investments — (1,233 ) (52 ) (3,274 ) Other securities (fair value accounting) (325 ) (52,264 ) (1,117 ) (166,051 ) Non-marketable securities (equity method accounting): Venture capital and private equity fund investments (914 ) (115 ) (1,351 ) (231 ) Debt funds (1 ) (64 ) (589 ) (457 ) Other investments (460 ) — (1,470 ) (759 ) Non-marketable securities (cost method accounting): Venture capital and private equity fund investments (2) (132 ) (272 ) (530 ) (781 ) Other investments (6 ) — (15 ) (260 ) Total gross losses on investment securities (3,019 ) (80,567 ) (8,040 ) (266,108 ) Gains on investment securities, net $ 18,768 $ 5,644 $ 77,006 $ 172,236 (1) Includes realized gains (losses) on sales of available-for-sale equity securities that are recognized in the income statement. Unrealized gains (losses) on available-for-sale fixed income and equity securities are recognized in other comprehensive income. The cost basis of available-for-sale securities sold is determined on a specific identification basis. (2) For the three months ended September 30, 2015 and 2014 , includes OTTI losses of $0.1 million from the declines in value for 4 of the 270 investments and $0.3 million from the declines in value for 5 of the 281 investments, respectively. For the nine months ended September 30, 2015 and 2014, includes OTTI losses of $0.4 million from the declines in value for 19 of the 270 investments and $0.7 million from the declines in value for 22 of the 281 investments, respectively. We concluded that any declines in value for the remaining investments were temporary, and as such, no OTTI was required to be recognized.

Loans and Allowance for Loan Lo

Loans and Allowance for Loan Losses	9 Months Ended
	Sep. 30, 2015
Receivables [Abstract]
Loans and Allowance for Loan Losses	Loans and Allowance for Loan Losses We serve a variety of clients in the technology and life science & healthcare industries. Our technology clients tend to be in the industries of: hardware (such as semiconductors, communications, data storage, and electronics); software and internet (such as infrastructure software, applications, software services, digital content and advertising technology), and energy and resource innovation ("ERI"). Because of the diverse nature of ERI products and services, for our loan-related reporting purposes, ERI-related loans are reported under hardware and software, as applicable. Our life science & healthcare clients primarily tend to be in the industries of biotechnology, medical devices, healthcare information technology and healthcare services. Loans made to private equity/venture capital firm clients typically enable them to fund investments prior to their receipt of funds from capital calls. Loans to the premium wine industry focus on vineyards and wineries that produce grapes and wines of high quality. In addition to commercial loans, we make consumer loans through SVB Private Bank and provide real estate secured loans to eligible employees through our EHOP. Our private banking clients are primarily private equity/venture capital professionals and executive leaders in the innovation companies they support. These products and services include real estate secured home equity lines of credit, which may be used to finance real estate investments and loans used to purchase, renovate or refinance personal residences. These products and services also include restricted stock purchase loans and capital call lines of credit. We also provide community development loans made as part of our responsibilities under the Community Reinvestment Act. These loans are included within “Construction loans” below and are primarily secured by real estate. The composition of loans, net of unearned income of $115 million and $104 million at September 30, 2015 and December 31, 2014 , respectively, is presented in the following table: (Dollars in thousands) September 30, 2015 December 31, 2014 Commercial loans: Software and internet $ 5,272,825 $ 4,954,676 Hardware 962,295 1,131,006 Private equity/venture capital 4,571,102 4,582,906 Life science & healthcare 1,598,362 1,289,904 Premium wine 193,712 187,568 Other 295,550 234,551 Total commercial loans 12,893,846 12,380,611 Real estate secured loans: Premium wine (1) 633,248 606,753 Consumer loans (2) 1,444,067 1,118,115 Other 38,043 39,651 Total real estate secured loans 2,115,358 1,764,519 Construction loans 92,551 78,626 Consumer loans 212,825 160,520 Total loans, net of unearned income (3) $ 15,314,580 $ 14,384,276 (1) Included in our premium wine portfolio are gross construction loans of $119 million and $112 million at September 30, 2015 and December 31, 2014 , respectively. (2) Consumer loans secured by real estate at September 30, 2015 and December 31, 2014 were comprised of the following: (Dollars in thousands) September 30, 2015 December 31, 2014 Loans for personal residence $ 1,225,794 $ 918,629 Loans to eligible employees 149,612 133,568 Home equity lines of credit 68,661 65,918 Consumer loans secured by real estate $ 1,444,067 $ 1,118,115 (3) Included within our total loan portfolio are credit card loans of $186 million and $131 million at September 30, 2015 and December 31, 2014 , respectively. Credit Quality The composition of loans, net of unearned income of $115 million and $104 million at September 30, 2015 and December 31, 2014 , respectively, broken out by portfolio segment and class of financing receivable, is as follows: (Dollars in thousands) September 30, 2015 December 31, 2014 Commercial loans: Software and internet $ 5,272,825 $ 4,954,676 Hardware 962,295 1,131,006 Private equity/venture capital 4,571,102 4,582,906 Life science & healthcare 1,598,362 1,289,904 Premium wine 826,960 794,321 Other 426,144 352,828 Total commercial loans 13,657,688 13,105,641 Consumer loans: Real estate secured loans 1,444,067 1,118,115 Other consumer loans 212,825 160,520 Total consumer loans 1,656,892 1,278,635 Total loans, net of unearned income $ 15,314,580 $ 14,384,276 The following table summarizes the aging of our gross loans, broken out by portfolio segment and class of financing receivable as of September 30, 2015 and December 31, 2014 : (Dollars in thousands) 30 - 59 Days Past Due 60 - 89 Days Past Due Greater Than 90 Days Past Due Total Past Due Current Loans Past Due 90 Days or More Still Accruing Interest September 30, 2015: Commercial loans: Software and internet $ 9,729 $ 1,168 $ 169 $ 11,066 $ 5,244,198 $ 169 Hardware 620 1,021 — 1,641 965,511 — Private equity/venture capital 410 — — 410 4,611,543 — Life science & healthcare 377 729 — 1,106 1,566,185 — Premium wine 295 — — 295 827,709 — Other — 8 — 8 429,145 — Total commercial loans 11,431 2,926 169 14,526 13,644,291 169 Consumer loans: Real estate secured loans — — — — 1,443,011 — Other consumer loans 1,313 — — 1,313 211,339 — Total consumer loans 1,313 — — 1,313 1,654,350 — Total gross loans excluding impaired loans 12,744 2,926 169 15,839 15,298,641 169 Impaired loans — 1,798 8,295 10,093 105,368 — Total gross loans $ 12,744 $ 4,724 $ 8,464 $ 25,932 $ 15,404,009 $ 169 December 31, 2014: Commercial loans: Software and internet $ 10,989 $ 1,627 $ 52 $ 12,668 $ 4,950,291 $ 52 Hardware 13,424 126 — 13,550 1,124,423 — Private equity/venture capital 40,773 — — 40,773 4,580,526 — Life science & healthcare 738 786 — 1,524 1,298,728 — Premium wine — — — — 795,345 — Other 178 3 — 181 354,939 — Total commercial loans 66,102 2,542 52 68,696 13,104,252 52 Consumer loans: Real estate secured loans 1,592 341 1,250 3,183 1,114,286 1,250 Other consumer loans — — — — 160,212 — Total consumer loans 1,592 341 1,250 3,183 1,274,498 1,250 Total gross loans excluding impaired loans 67,694 2,883 1,302 71,879 14,378,750 1,302 Impaired loans 598 1,293 22,320 24,211 13,926 — Total gross loans $ 68,292 $ 4,176 $ 23,622 $ 96,090 $ 14,392,676 $ 1,302 The following table summarizes our impaired loans as they relate to our allowance for loan losses, broken out by portfolio segment and class of financing receivable as of September 30, 2015 and December 31, 2014 : (Dollars in thousands) Impaired loans for which there is a related allowance for loan losses Impaired loans for which there is no related allowance for loan losses Total carrying value of impaired loans Total unpaid principal of impaired loans September 30, 2015: Commercial loans: Software and internet $ 64,792 $ — $ 64,792 $ 89,471 Hardware 3,586 177 3,763 3,802 Private equity/venture capital — — — — Life science & healthcare 45,389 — 45,389 45,904 Premium wine — 1,201 1,201 1,716 Other 157 — 157 157 Total commercial loans 113,924 1,378 115,302 141,050 Consumer loans: Real estate secured loans — 159 159 1,399 Other consumer loans — — — — Total consumer loans — 159 159 1,399 Total $ 113,924 $ 1,537 $ 115,461 $ 142,449 December 31, 2014: Commercial loans: Software and internet $ 33,287 $ — $ 33,287 $ 34,218 Hardware 1,403 1,118 2,521 2,535 Private equity/venture capital — — — — Life science & healthcare 475 — 475 2,453 Premium wine — 1,304 1,304 1,743 Other 233 — 233 233 Total commercial loans 35,398 2,422 37,820 41,182 Consumer loans: Real estate secured loans — 192 192 1,412 Other consumer loans 125 — 125 305 Total consumer loans 125 192 317 1,717 Total $ 35,523 $ 2,614 $ 38,137 $ 42,899 The following table summarizes our average impaired loans, broken out by portfolio segment and class of financing receivable for the three and nine months ended September 30, 2015 and 2014 : Three months ended September 30, Nine months ended September 30, (Dollars in thousands) 2015 2014 2015 2014 Average impaired loans: Commercial loans: Software and internet $ 77,156 $ 10,651 $ 54,543 $ 13,690 Hardware 2,796 1,540 1,944 8,140 Life science & healthcare 17,184 333 6,526 636 Premium wine 1,213 1,364 1,245 1,398 Other 3,132 674 3,498 1,383 Total commercial loans 101,481 14,562 67,756 25,247 Consumer loans: Real estate secured loans 162 212 180 224 Other consumer loans — 261 55 375 Total consumer loans 162 473 235 599 Total average impaired loans $ 101,643 $ 15,035 $ 67,991 $ 25,846 The following tables summarize the activity relating to our allowance for loan losses for the three and nine months ended September 30, 2015 and 2014 , broken out by portfolio segment: Three months ended September 30, 2015 (dollars in thousands) Beginning Balance June 30, 2015 Charge-offs Recoveries Provision for (Reduction of) Loan Losses Ending Balance September 30, 2015 Commercial loans: Software and internet $ 106,728 $ (24,815 ) $ 195 $ 5,958 $ 88,066 Hardware 20,472 — 240 (70 ) 20,642 Private equity/venture capital 29,276 — — 3,166 32,442 Life science & healthcare 17,233 (117 ) 50 19,793 36,959 Premium wine 4,409 — — 253 4,662 Other 5,894 (4,186 ) 89 2,976 4,773 Total commercial loans 184,012 (29,118 ) 574 32,076 187,544 Consumer loans 8,632 — 4 1,327 9,963 Total allowance for loan losses $ 192,644 $ (29,118 ) $ 578 $ 33,403 $ 197,507 Three months ended September 30, 2014 (dollars in thousands) Beginning Balance June 30, 2014 Charge-offs Recoveries Provision for (Reduction of) Loan Losses Ending Balance September 30, 2014 Commercial loans: Software and internet $ 53,239 $ (6,907 ) $ 790 $ 11,078 $ 58,200 Hardware 24,780 (2,643 ) 113 2,491 24,741 Private equity/venture capital 19,004 — — 845 19,849 Life science & healthcare 10,597 — 53 1,591 12,241 Premium wine 3,546 (35 ) — 710 4,221 Other 3,218 (1,072 ) 1,306 (530 ) 2,922 Total commercial loans 114,384 (10,657 ) 2,262 16,185 122,174 Consumer loans 6,344 — 118 425 6,887 Total allowance for loan losses $ 120,728 $ (10,657 ) $ 2,380 $ 16,610 $ 129,061 Nine months ended September 30, 2015 (dollars in thousands) Beginning Balance December 31, 2014 Charge-offs Recoveries Provision for Ending Balance September 30, 2015 Commercial loans: Software and internet $ 80,981 $ (26,980 ) $ 1,239 $ 32,826 $ 88,066 Hardware 25,860 (4,049 ) 3,049 (4,218 ) 20,642 Private equity/venture capital 27,997 — — 4,445 32,442 Life science & healthcare 15,208 (3,336 ) 129 24,958 36,959 Premium wine 4,473 — 7 182 4,662 Other 3,253 (4,974 ) 559 5,935 4,773 Total commercial loans 157,772 (39,339 ) 4,983 64,128 187,544 Consumer loans 7,587 — 136 2,240 9,963 Total allowance for loan losses $ 165,359 $ (39,339 ) $ 5,119 $ 66,368 $ 197,507 Nine months ended September 30, 2014 (dollars in thousands) Beginning Balance December 31, 2013 Charge-offs Recoveries Provision for (Reduction of) Loan Losses Ending Balance September 30, 2014 Commercial loans: Software and internet $ 64,084 $ (18,932 ) $ 1,023 $ 12,025 $ 58,200 Hardware 36,553 (15,230 ) 2,070 1,348 24,741 Private equity/venture capital 16,385 — — 3,464 19,849 Life science & healthcare 11,926 (930 ) 341 904 12,241 Premium wine 3,914 (35 ) 238 104 4,221 Other 3,680 (3,062 ) 1,316 988 2,922 Total commercial loans 136,542 (38,189 ) 4,988 18,833 122,174 Consumer loans 6,344 — 325 218 6,887 Total allowance for loan losses $ 142,886 $ (38,189 ) $ 5,313 $ 19,051 $ 129,061 The following table summarizes the allowance for loan losses individually and collectively evaluated for impairment as of September 30, 2015 and December 31, 2014 , broken out by portfolio segment: September 30, 2015 December 31, 2014 Individually Evaluated for Impairment Collectively Evaluated for Impairment Individually Evaluated for Impairment Collectively Evaluated for Impairment (Dollars in thousands) Allowance for loan losses Recorded investment in loans Allowance for loan losses Recorded investment in loans Allowance for loan losses Recorded investment in loans Allowance for loan losses Recorded investment in loans Commercial loans: Software and internet $ 25,260 $ 64,792 $ 62,806 $ 5,208,033 $ 13,695 $ 33,287 $ 67,286 $ 4,921,389 Hardware 1,100 3,763 19,542 958,532 1,133 2,521 24,727 1,128,485 Private equity/venture capital — — 32,442 4,571,102 — — 27,997 4,582,906 Life science & healthcare 19,739 45,389 17,220 1,552,973 121 475 15,087 1,289,429 Premium wine — 1,201 4,662 825,759 — 1,304 4,473 793,017 Other 157 157 4,616 425,987 71 233 3,182 352,595 Total commercial loans 46,256 115,302 141,288 13,542,386 15,020 37,820 142,752 13,067,821 Consumer loans — 159 9,963 1,656,733 31 317 7,556 1,278,318 Total $ 46,256 $ 115,461 $ 151,251 $ 15,199,119 $ 15,051 $ 38,137 $ 150,308 $ 14,346,139 Credit Quality Indicators For each individual client, we establish an internal credit risk rating for that loan, which is used for assessing and monitoring credit risk as well as performance of the loan and the overall portfolio. Our internal credit risk ratings are also used to summarize the risk of loss due to failure by an individual borrower to repay the loan. For our internal credit risk ratings, each individual loan is given a risk rating of 1 through 10. Loans risk-rated 1 through 4 are performing loans and translate to an internal rating of “Pass”, with loans risk-rated 1 being cash secured. Loans risk-rated 5 through 7 are performing loans, however, we consider them as demonstrating higher risk, which requires more frequent review of the individual exposures; these translate to an internal rating of “Performing (Criticized)”. Loans risk-rated 8 and 9 are loans that are considered to be impaired and are on nonaccrual status. (For further description of nonaccrual loans, refer to Note 2—“Summary of Significant Accounting Policies” under Part II, Item 8 of our 2014 Form 10-K). Loans rated 10 are charged-off and are not included as part of our loan portfolio balance. We review our credit quality indicators for performance and appropriateness of risk ratings as part of our evaluation process for our allowance for loan losses. The following table summarizes the credit quality indicators, broken out by portfolio segment and class of financing receivables as of September 30, 2015 and December 31, 2014 : (Dollars in thousands) Pass Performing (Criticized) Impaired Total September 30, 2015: Commercial loans: Software and internet $ 4,802,522 $ 452,742 $ 64,792 $ 5,320,056 Hardware 834,067 133,085 3,763 970,915 Private equity/venture capital 4,611,953 — — 4,611,953 Life science & healthcare 1,446,972 120,319 45,389 1,612,680 Premium wine 804,411 23,593 1,201 829,205 Other 417,459 11,694 157 429,310 Total commercial loans 12,917,384 741,433 115,302 13,774,119 Consumer loans: Real estate secured loans 1,433,926 9,085 159 1,443,170 Other consumer loans 211,366 1,286 — 212,652 Total consumer loans 1,645,292 10,371 159 1,655,822 Total gross loans $ 14,562,676 $ 751,804 $ 115,461 $ 15,429,941 December 31, 2014: Commercial loans: Software and internet $ 4,611,253 $ 351,706 $ 33,287 $ 4,996,246 Hardware 945,998 191,975 2,521 1,140,494 Private equity/venture capital 4,615,231 6,068 — 4,621,299 Life science & healthcare 1,165,266 134,986 475 1,300,727 Premium wine 774,962 20,383 1,304 796,649 Other 346,153 8,967 233 355,353 Total commercial loans 12,458,863 714,085 37,820 13,210,768 Consumer loans: Real estate secured loans 1,112,396 5,073 192 1,117,661 Other consumer loans 158,162 2,050 125 160,337 Total consumer loans 1,270,558 7,123 317 1,277,998 Total gross loans $ 13,729,421 $ 721,208 $ 38,137 $ 14,488,766 TDRs As of September 30, 2015 we had thirteen TDRs with a total carrying value of $91.3 million where concessions have been granted to borrowers experiencing financial difficulties, in an attempt to maximize collection. There were less than $0.5 million of unfunded commitments available for funding to the clients associated with these TDRs as of September 30, 2015 . The following table summarizes our loans modified in TDRs, broken out by portfolio segment and class of financing receivables at September 30, 2015 and December 31, 2014 : (Dollars in thousands) September 30, 2015 December 31, 2014 Loans modified in TDRs: Commercial loans: Software and internet $ 57,766 $ 3,784 Hardware 2,301 1,118 Life science & healthcare 29,529 — Premium wine 1,202 1,891 Other 518 233 Total commercial loans 91,316 7,026 Consumer loans: Other consumer loans — 125 Total consumer loans — 125 Total $ 91,316 $ 7,151 The following table summarizes the recorded investment in loans modified in TDRs, broken out by portfolio segment and class of financing receivable, for modifications made during the three and nine months ended September 30, 2015 and 2014 : Three months ended September 30, Nine months ended September 30, (Dollars in thousands) 2015 2014 2015 2014 Loans modified in TDRs during the period: Commercial loans: Software and internet (1) $ 51,749 $ 496 $ 57,766 $ 7,848 Hardware — — 2,031 — Life science & healthcare 29,530 — 29,530 — Premium wine — — — 614 Other 518 — 518 — Total loans modified in TDRs during the period (1) $ 81,797 $ 496 $ 89,845 $ 8,462 (1) There were partial charge-offs of two loans classified as TDRs in our software and internet loan portfolio for $22.4 million during the three and nine months ended September 30, 2015 and no partial charge-offs during the three and nine months ended September 30, 2014. During the three and nine months ended September 30, 2015 , new TDRs of $81.8 million and $89.8 million were modified through payment deferrals granted to our clients. During the three months ended September 30, 2014 , new TDRs of $0.5 million were modified through payment deferrals granted to our clients. During the nine months ended September 30, 2014 , new TDRs of $7.1 million were modified through payment deferrals granted to our clients and $1.3 million were modified through partial forgiveness of principal. The related allowance for loan losses for the majority of our TDRs is determined on an individual basis by comparing the carrying value of the loan to the present value of the estimated future cash flows, discounted at the pre-modification contractual interest rate. For certain TDRs, the related allowance for loan losses is determined based on the fair value of the collateral if the loan is collateral dependent. The following table summarizes the recorded investment in loans modified in TDRs within the previous 12 months that subsequently defaulted during the three and nine months ended September 30, 2015 . There were no loans modified in TDRs within the previous 12 months that subsequently defaulted during the three and nine months ended September 30, 2014. Three months ended September 30, Nine months ended September 30, (Dollars in thousands) 2015 2015 TDRs modified within the previous 12 months that defaulted during the period: Commercial loans: Software and internet $ 11,107 $ 17,124 Hardware 2,031 2,031 Life science & healthcare 958 958 Total TDRs modified within the previous 12 months that defaulted in the period $ 14,096 $ 20,113 Charge-offs and defaults on previously restructured loans are evaluated to determine the impact to the allowance for loan losses, if any. The evaluation of these defaults may impact the assumptions used in calculating the reserve on other TDRs and impaired loans as well as management’s overall outlook of macroeconomic factors that affect the reserve on the loan portfolio as a whole. After evaluating the charge-offs and defaults experienced on our TDRs we determined that no change to our reserving methodology was necessary to determine the allowance for loan losses as of September 30, 2015 .

Disposal - Assets Held-for-Sale

Disposal - Assets Held-for-Sale	9 Months Ended
	Sep. 30, 2015
Discontinued Operations and Disposal Groups [Abstract]
Disposal - Assets Held-for-Sale	Disposal - Assets Held-for-Sale At December 31, 2014, we had assets held-for-sale of $44.3 million related to our agreement to sell all of the outstanding capital stock of the Bank’s subsidiary, SVB India Finance Private Limited, a non-banking financial company in India (“ SVBIF ”) to Temasek, a Singapore investment company. The sale was completed on April 13, 2015 and no held-for-sale operations remain at September 30, 2015.

Short-Term Borrowings and Long-

Short-Term Borrowings and Long-Term Debt	9 Months Ended
	Sep. 30, 2015
Debt Disclosure [Abstract]
Short-Term Borrowings and Long-Term Debt	Short-Term Borrowings and Long-Term Debt The following table represents outstanding short-term borrowings and long-term debt at September 30, 2015 and December 31, 2014 : Carrying Value (Dollars in thousands) Maturity Principal value at September 30, 2015 September 30, December 31, Short-term borrowings: Other short-term borrowings (1) $ 3,756 $ 7,781 Total short-term borrowings $ 3,756 $ 7,781 Long-term debt: 3.50% Senior Notes January 29, 2025 $ 350,000 $ 346,591 $ — 5.375% Senior Notes September 15, 2020 350,000 346,878 346,477 6.05% Subordinated Notes (2) June 1, 2017 45,964 49,028 50,040 7.0% Junior Subordinated Debentures October 15, 2033 50,000 54,714 54,845 Total long-term debt $ 797,211 $ 451,362 (1) Represents cash collateral received from certain counterparties in relation to market value exposures of derivative contracts in our favor. (2) At September 30, 2015 and December 31, 2014 , included in the carrying value of our 6.05% Subordinated Notes was an interest rate swap valued at $3.5 million and $ 4.6 million , respectively, related to hedge accounting associated with the notes. Interest expense related to long-term debt was $9.0 million and $25.9 million for the three and nine months ended September 30, 2015 , and $5.8 million and $17.4 million for the three and nine months ended September 30, 2014 . Interest expense is net of the hedge accounting impact from our interest rate swap agreement related to our 6.05% Subordinated Notes. The weighted average interest rate associated with our short-term borrowings as of September 30, 2015 was 0. 11 percent . 3.50% Senior Notes On January 29, 2015, the Company issued $350 million of 3.50% Senior Notes due in January 2025 (“3.50% Senior Notes”). We received net proceeds from this offering of approximately $346.4 million after deducting underwriting discounts and commissions and issuance costs. The balance of our 3.50% Senior Notes at September 30, 2015 was $346.6 million , which is reflective of $3.0 million of debt issuance costs and a $0.3 million discount. Available Lines of Credit We have certain facilities in place to enable us to access short-term borrowings on a secured (using high-quality fixed income securities as collateral) and an unsecured basis. These include repurchase agreements and uncommitted federal funds lines with various financial institutions. As of September 30, 2015 , we did not borrow against our uncommitted federal funds lines. We also pledge securities to the FHLB of San Francisco and the discount window at the Federal Reserve Bank. The market value of collateral pledged to the FHLB of San Francisco (comprised primarily of U.S. Treasury securities) at September 30, 2015 totaled $1.3 billion , all of which was unused and available to support additional borrowings. The market value of collateral pledged at the discount window of the Federal Reserve Bank at September 30, 2015 totaled $920 million , all of which was unused and available to support additional borrowings.

Derivative Financial Instrument

Derivative Financial Instruments	9 Months Ended
	Sep. 30, 2015
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Derivative Financial Instruments	Derivative Financial Instruments We primarily use derivative financial instruments to manage interest rate risk, currency exchange rate risk, and to assist customers with their risk management objectives. Also, in connection with negotiating credit facilities and certain other services, we often obtain equity warrant assets giving us the right to acquire stock in private, venture-backed companies in the technology and life science & healthcare industries. Interest Rate Risk Interest rate risk is our primary market risk and can result from timing and volume differences in the repricing of our interest rate-sensitive assets and liabilities and changes in market interest rates. To manage interest rate risk for our 6.05% Subordinated Notes, we entered into a fixed-for-floating interest rate swap agreement at the time of debt issuance based upon LIBOR with matched-terms. Net cash benefits associated with our interest rate swap is recorded as a reduction in “Interest expense—Borrowings,” a component of net interest income. The fair value of our interest rate swaps is calculated using a discounted cash flow method and adjusted for credit valuation associated with counterparty risk. Changes in fair value of the interest rate swaps are reflected in either other assets (for swaps in an asset position) or other liabilities (for swaps in a liability position). We assess hedge effectiveness under ASC 815, Derivatives and Hedging , using the long-haul method. Any differences associated with our interest rate swap that arise as a result of hedge ineffectiveness is recorded through net gains on derivative instruments, in noninterest income, a component of consolidated net income. Currency Exchange Risk We enter into foreign exchange forward contracts to economically reduce our foreign exchange exposure risk associated with the net difference between foreign currency denominated assets and liabilities. We do not designate any foreign exchange forward contracts as derivative instruments that qualify for hedge accounting. Gains or losses from changes in currency rates on foreign currency denominated instruments are included in other noninterest income, a component of noninterest income. We may experience ineffectiveness in the economic hedging relationship, because the instruments are revalued based upon changes in the currency’s spot rate on the principal value, while the forwards are revalued on a discounted cash flow basis. We record forward agreements in gain positions in other assets and loss positions in other liabilities, while net changes in fair value are recorded through net gains on derivative instruments, in noninterest income, a component of consolidated net income. Additionally, through our global banking operations we maintain customer deposits denominated in a variety of global currencies, which are used to fund certain loans in these currencies to limit our exposure to currency fluctuations. Other Derivative Instruments Also included in our derivative instruments are equity warrant assets and client forward and option contracts, and client interest rate contracts. For further description of these other derivative instruments, refer to Note 2-“Summary of Significant Accounting Policies" under Part II, Item 8 of our 2014 Form 10-K. Counterparty Credit Risk We are exposed to credit risk if counterparties to our derivative contracts do not perform as expected. We mitigate counterparty credit risk through credit approvals, limits, monitoring procedures and obtaining collateral, as appropriate. With respect to measuring counterparty credit risk for derivative instruments, we measure the fair value of a group of financial assets and financial liabilities on a net risk basis by counterparty portfolio. The total notional or contractual amounts, fair value, collateral and net exposure of our derivative financial instruments at September 30, 2015 and December 31, 2014 were as follows: September 30, 2015 December 31, 2014 (Dollars in thousands) Balance Sheet Location Notional or Contractual Amount Fair Value Collateral (1) Net Exposure (2) Notional or Contractual Amount Fair Value Collateral (1) Net Exposure (2) Derivatives designated as hedging instruments: Interest rate risks: Interest rate swaps Other assets $ 45,964 $ 3,485 $ — $ 3,485 $ 45,964 $ 4,609 $ 2,970 $ 1,639 Derivatives not designated as hedging instruments: Currency exchange risks: Foreign exchange forwards Other assets 17,038 594 — 594 200,957 5,050 2,441 2,609 Foreign exchange forwards Other liabilities 37,609 (1,075 ) — (1,075 ) 6,226 (489 ) — (489 ) Net exposure (481 ) — (481 ) 4,561 2,441 2,120 Other derivative instruments: Equity warrant assets Other assets 208,270 130,091 — 130,091 197,878 116,604 — 116,604 Other derivatives: Client foreign exchange forwards Other assets 733,204 32,431 3,756 28,675 801,487 28,954 2,370 26,584 Client foreign exchange forwards Other liabilities 695,403 (27,618 ) — (27,618 ) 774,355 (27,647 ) — (27,647 ) Client foreign currency options Other assets 28,390 246 — 246 34,926 227 — 227 Client foreign currency options Other liabilities 28,390 (246 ) — (246 ) 34,926 (227 ) — (227 ) Client interest rate derivatives Other assets 459,614 5,164 — 5,164 387,410 2,546 — 2,546 Client interest rate derivatives Other liabilities 459,614 (5,719 ) — (5,719 ) 387,410 (2,748 ) — (2,748 ) Net exposure 4,258 3,756 502 1,105 2,370 (1,265 ) Net $ 137,353 $ 3,756 $ 133,597 $ 126,879 $ 7,781 $ 119,098 (1) Cash collateral received from our counterparties in relation to market value exposures of derivative contracts in our favor is recorded as a component of “short-term borrowings” on our consolidated balance sheets. (2) Net exposure for contracts in a gain position reflects the replacement cost in the event of nonperformance by all such counterparties. The credit ratings of our institutional counterparties as of September 30, 2015 remain at investment grade or higher and there were no material changes in their credit ratings during the three and nine months ended September 30, 2015 . A summary of our derivative activity and the related impact on our consolidated statements of income for the three and nine months ended September 30, 2015 and 2014 is as follows: Three months ended September 30, Nine months ended September 30, (Dollars in thousands) Statement of income location 2015 2014 2015 2014 Derivatives designated as hedging instruments: Interest rate risks: Net cash benefit associated with interest rate swaps Interest expense—borrowings $ 631 $ 638 $ 1,903 $ 1,915 Changes in fair value of interest rate swaps Net gains on derivative instruments (8 ) (12 ) (22 ) (37 ) Net gains associated with interest rate risk derivatives $ 623 $ 626 $ 1,881 $ 1,878 Derivatives not designated as hedging instruments: Currency exchange risks: Gains (losses) on revaluations of foreign currency instruments Other noninterest income $ 186 $ (12,640 ) $ (11,667 ) $ (12,347 ) (Losses) gains on internal foreign exchange forward contracts, net Net gains on derivative instruments (218 ) 12,529 11,626 12,038 Net losses associated with currency risk $ (32 ) $ (111 ) $ (41 ) $ (309 ) Other derivative instruments: Net gains on equity warrant assets Net gains on derivative instruments $ 10,685 $ 13,157 $ 54,579 $ 50,859 Gains on client foreign exchange forward contracts, net Net gains on derivative instruments $ 179 $ 886 $ 459 $ 1,358 Net losses on other derivatives (1) Net gains on derivative instruments $ (394 ) $ (22 ) $ (352 ) $ (738 ) (1) Primarily represents the change in fair value of loan conversion options. Balance Sheet Offsetting Certain of our derivative and other financial instruments are subject to enforceable master netting arrangements with our counterparties. These agreements provide for the net settlement of multiple contracts with a single counterparty through a single payment, in a single currency, in the event of default on or termination of any one contract. The following table summarizes our assets subject to enforceable master netting arrangements as of September 30, 2015 and December 31, 2014 : Gross Amounts Not Offset in the Statement of Financial Position But Subject to Master Netting Arrangements (Dollars in thousands) Gross Amounts of Recognized Assets Gross Amounts offset in the Statement of Financial Position Net Amounts of Assets Presented in the Statement of Financial Position Financial Instruments Cash Collateral Received Net Amount September 30, 2015 Derivative Assets: Interest rate swaps $ 3,485 $ — $ 3,485 $ (3,485 ) $ — $ — Foreign exchange forwards 33,025 — 33,025 (19,373 ) (3,756 ) 9,896 Foreign currency options 322 (76 ) 246 (152 ) — 94 Client interest rate derivatives 5,164 — 5,164 (5,164 ) — — Total derivative assets: 41,996 (76 ) 41,920 (28,174 ) (3,756 ) 9,990 Reverse repurchase, securities borrowing, and similar arrangements 214,484 — 214,484 (214,484 ) — — Total $ 256,480 $ (76 ) $ 256,404 $ (242,658 ) $ (3,756 ) $ 9,990 December 31, 2014 Derivative Assets: Interest rate swaps $ 4,609 $ — $ 4,609 $ (1,639 ) $ (2,970 ) $ — Foreign exchange forwards 34,004 — 34,004 (17,843 ) (4,811 ) 11,350 Foreign currency options 501 (274 ) 227 (144 ) — 83 Client interest rate derivatives 2,546 — 2,546 (2,546 ) — — Total derivative assets: 41,660 (274 ) 41,386 (22,172 ) (7,781 ) 11,433 Reverse repurchase, securities borrowing, and similar arrangements 95,611 — 95,611 (95,611 ) — — Total $ 137,271 $ (274 ) $ 136,997 $ (117,783 ) $ (7,781 ) $ 11,433 The following table summarizes our liabilities subject to enforceable master netting arrangements as of September 30, 2015 and December 31, 2014 : Gross Amounts Not Offset in the Statement of Financial Position But Subject to Master Netting Arrangements (Dollars in thousands) Gross Amounts of Recognized Liabilities Gross Amounts offset in the Statement of Financial Position Net Amounts of Liabilities Presented in the Statement of Financial Position Financial Instruments Cash Collateral Pledged Net Amount September 30, 2015 Derivative Liabilities: Foreign exchange forwards $ 28,693 $ — $ 28,693 $ (10,329 ) $ — $ 18,364 Foreign currency options 322 (76 ) 246 (94 ) — 152 Client interest rate derivatives 5,719 — 5,719 (5,719 ) — — Total derivative liabilities: 34,734 (76 ) 34,658 (16,142 ) — 18,516 Repurchase, securities lending, and similar arrangements — — — — — — Total $ 34,734 $ (76 ) $ 34,658 $ (16,142 ) $ — $ 18,516 December 31, 2014 Derivative Liabilities: Foreign exchange forwards $ 28,136 $ — $ 28,136 $ (16,808 ) $ — $ 11,328 Foreign currency options 501 (274 ) 227 (83 ) — 144 Client interest rate derivatives 2,748 — 2,748 (2,748 ) — — Total derivative liabilities: 31,385 (274 ) 31,111 (19,639 ) — 11,472 Repurchase, securities lending, and similar arrangements — — — — — — Total $ 31,385 $ (274 ) $ 31,111 $ (19,639 ) $ — $ 11,472

Other Noninterest Income and Ot

Other Noninterest Income and Other Noninterest Expense	9 Months Ended
	Sep. 30, 2015
Other Income and Expenses [Abstract]
Other Noninterest Income and Other Noninterest Expense	Other Noninterest Income and Other Noninterest Expense A summary of other noninterest income for the three and nine months ended September 30, 2015 and 2014 is as follows: Three months ended September 30, Nine months ended September 30, (Dollars in thousands) 2015 2014 2015 2014 Fund management fees $ 4,074 $ 3,574 $ 11,657 $ 9,888 Service-based fee income 1,931 2,180 6,450 6,459 Gains (losses) on revaluation of foreign currency instruments (1) 186 (12,640 ) (11,667 ) (12,347 ) Other (2) (3) 4,886 1,525 15,875 10,601 Total other noninterest income $ 11,077 $ (5,361 ) $ 22,315 $ 14,601 (1) Represents the revaluation of foreign currency denominated financial instruments issued and held by us, primarily loans, deposits and cash. (2) Includes dividends on FHLB/FRB stock, correspondent bank rebate income and other fee income. (3) Amount for the nine months ended September 30, 2015 has been revised to reflect the retrospective application of new accounting guidance adopted in the second quarter of 2015 related to our consolidated variable interest entities (ASU 2015-02). Amount prior to January 1, 2015 has not been revised for the adoption of this guidance. See Note 1— "Basis of Presentation” of the “Notes to Interim Consolidated Financial Statements (unaudited)” under Part I, Item 1 of this report for additional details. A summary of other noninterest expense for the three and nine months ended September 30, 2015 and 2014 is as follows: Three months ended September 30, Nine months ended September 30, (Dollars in thousands) 2015 2014 2015 2014 Lending and other client related processing costs $ 3,608 $ 3,215 $ 10,861 $ 8,160 Telephone 2,224 1,931 6,727 5,217 Data processing services 2,083 2,229 5,274 6,497 Postage and supplies 728 763 2,220 2,248 Dues and publications 521 719 1,803 1,852 Other (1) 5,106 4,711 15,216 9,381 Total other noninterest expense (2) $ 14,270 $ 13,568 $ 42,101 $ 33,355 (1) Amount for the nine months ended September 30, 2015 has been revised to reflect the retrospective application of new accounting guidance adopted in the second quarter of 2015 related to our consolidated variable interest entities (ASU 2015-02). Amount prior to January 1, 2015 has not been revised for the adoption of this guidance. See Note 1— "Basis of Presentation” of the “Notes to Interim Consolidated Financial Statements (unaudited)” under Part I, Item 1 of this report for additional details. (2) 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 1— "Basis of Presentation" of the "Notes to Interim Consolidated Financial Statements" under Part I, Item 1 in this report.

Segment Reporting

Segment Reporting	9 Months Ended
	Sep. 30, 2015
Segment Reporting [Abstract]
Segment Reporting	Segment Reporting We have three reportable segments for management reporting purposes: Global Commercial Bank, SVB Private Bank and SVB Capital. The results of our operating segments are based on our internal management reporting process. Our operating segments’ primary source of revenue is from net interest income, which is primarily the difference between interest earned on loans, net of funds transfer pricing (“FTP”), and interest paid on deposits, net of FTP. Accordingly, our segments are reported using net interest income, net of FTP. FTP is an internal measurement framework designed to assess the financial impact of a financial institution’s sources and uses of funds. It is the mechanism by which an earnings credit is given for deposits raised, and an earnings charge is made for funded loans. FTP is calculated at an instrument level based on account characteristics. We also evaluate performance based on provision for loan losses, noninterest income and noninterest expense, which are presented as components of segment operating profit or loss. In calculating each operating segment’s noninterest expense, we consider the direct costs incurred by the operating segment as well as certain allocated direct costs. As part of this review, we allocate certain corporate overhead costs to a corporate account. We do not allocate income taxes to our segments. Additionally, our management reporting model is predicated on average asset balances; therefore, period-end asset balances are not presented for segment reporting purposes. Changes in an individual client’s primary relationship designation have resulted, and in the future may result, in the inclusion of certain clients in different segments in different periods. Unlike financial reporting, which benefits from the comprehensive structure provided by GAAP, our internal management reporting process is highly subjective, as there is no comprehensive, authoritative guidance for management reporting. Our management reporting process measures the performance of our operating segments based on our internal operating structure, which is subject to change from time to time, and is not necessarily comparable with similar information for other financial services companies. For reporting purposes, SVB Financial Group has three operating segments for which we report our financial information: • Global Commercial Bank is comprised of results from the following: ◦ Our Commercial Bank products and services are provided by the Bank and its subsidiaries to commercial clients in the technology, life science & healthcare and private equity/venture capital industries. The Bank provides solutions to the financial needs of commercial clients, through credit, global treasury management, foreign exchange, global trade finance, and other services. It serves clients within the United States, as well as non-U.S. clients in key international innovation markets. In addition, the Bank and its subsidiaries offer a variety of investment services and solutions to its clients that enable them to effectively manage their assets. ◦ Our Private Equity Division provides banking products and services primarily to our private equity and venture capital clients. ◦ Our Wine practice provides banking products and services to our premium wine industry clients, including vineyard development loans. ◦ SVB Analytics provides equity valuation services to companies and private equity/venture capital firms. ◦ Debt Fund Investments is comprised of our investments in certain debt funds in which we are a strategic investor. • SVB Private Bank is the private banking division of the Bank, which provides a range of personal financial solutions for consumers. Our clients are primarily private equity/venture capital professionals and executive leaders of the innovation companies they support. We offer a customized suite of private banking services, including mortgages, home equity lines of credit, restricted stock purchase loans, capital call lines of credit and other secured and unsecured lending, as well as cash and wealth management services. • SVB Capital is the venture capital investment arm of SVBFG, which focuses primarily on funds management. SVB Capital manages funds (primarily venture capital funds) on behalf of third party limited partners and, on a more limited basis, SVB Financial Group. The SVB Capital family of funds is comprised of direct venture funds that invest in companies and funds of funds that invest in other venture capital funds. SVB Capital generates income for the Company primarily from investment returns (including carried interest) and management fees. The summary financial results of our operating segments are presented along with a reconciliation to our consolidated interim results. Our segment information for the three and nine months ended September 30, 2015 and 2014 is as follows: (Dollars in thousands) Global Commercial Bank (1) SVB Private Bank SVB Capital (1) Other Items (2) Total Three months ended September 30, 2015 Net interest income $ 217,929 $ 11,667 $ 1 $ 25,063 $ 254,660 Provision for loan losses (32,076 ) (1,327 ) — — (33,403 ) Noninterest income 68,517 506 17,332 22,122 108,477 Noninterest expense (3) (135,504 ) (2,703 ) (3,745 ) (42,803 ) (184,755 ) Income before income tax expense (4) $ 118,866 $ 8,143 $ 13,588 $ 4,382 $ 144,979 Total average loans, net of unearned income $ 13,031,928 $ 1,669,858 $ — 214,866 $ 14,916,652 Total average assets (5) 40,211,915 1,273,823 334,045 199,441 42,019,224 Total average deposits 36,149,772 1,041,773 — 191,522 37,383,067 Three months ended September 30, 2014 Net interest income $ 187,184 $ 7,344 $ 12 $ 26,025 $ 220,565 Provision for loan losses (16,185 ) (425 ) — — (16,610 ) Noninterest income 57,714 491 1,064 20,898 80,167 Noninterest expense (3) (127,050 ) (2,574 ) (3,036 ) (47,101 ) (179,761 ) Income before income tax expense (4) $ 101,663 $ 4,836 $ (1,960 ) $ (178 ) $ 104,361 Total average loans, net of unearned income $ 10,022,333 $ 1,189,976 $ — 227,212 $ 11,439,521 Total average assets (5) 31,916,581 1,128,938 302,949 1,247,597 34,596,065 Total average deposits 28,795,499 877,701 — 53,084 29,726,284 Nine months ended September 30, 2015 Net interest income $ 625,618 $ 32,499 $ 3 $ 79,236 $ 737,356 Provision for loan losses (64,128 ) (2,240 ) — — (66,368 ) Noninterest income 197,740 1,498 57,919 101,131 358,288 Noninterest expense (3) (415,245 ) (8,589 ) (10,935 ) (134,639 ) (569,408 ) Income before income tax expense (4) $ 343,985 $ 23,168 $ 46,987 $ 45,728 $ 459,868 Total average loans, net of unearned income $ 12,721,208 $ 1,529,095 $ — 181,482 $ 14,431,785 Total average assets (5) 37,954,846 1,659,981 335,136 (38,438 ) 39,911,525 Total average deposits 34,125,675 1,125,345 — 162,333 35,413,353 Nine months ended September 30, 2014 Net interest income $ 540,533 $ 23,529 $ 55 $ 57,741 $ 621,858 (Provision for) reduction of loan losses (18,833 ) (218 ) — — (19,051 ) Noninterest income 169,376 1,121 35,617 198,488 404,602 Noninterest expense (3) (369,587 ) (7,709 ) (8,815 ) (135,002 ) (521,113 ) Income before income tax expense (4) $ 321,489 $ 16,723 $ 26,857 $ 121,227 $ 486,296 Total average loans, net of unearned income $ 9,766,870 $ 1,119,618 $ — 211,909 $ 11,098,397 Total average assets (5) 28,924,331 1,026,678 328,048 1,123,895 31,402,952 Total average deposits 26,020,715 805,167 — 56,231 26,882,113 (1) Global Commercial Bank’s and SVB Capital’s components of net interest income, noninterest income, noninterest expense and total average assets are shown net of noncontrolling interests for all periods presented. Noncontrolling interest is included within "Other Items". (2) The "Other Items" column reflects the adjustments necessary to reconcile the results of the operating segments to the consolidated financial statements prepared in conformity with GAAP. Noninterest income is primarily attributable to noncontrolling interests and gains on equity warrant assets. Noninterest expense primarily consists of expenses associated with corporate support functions such as finance, human resources, marketing, legal and other expenses. (3) The Global Commercial Bank segment includes direct depreciation and amortization of $4.7 million and $5.4 million for the three months September 30, 2015 and 2014 , respectively, and $14.4 million and $15.4 million for the nine months ended September 30, 2015 and 2014 , respectively. (4) The internal reporting model used by management to assess segment performance does not calculate income tax expense by segment. Our effective tax rate is a reasonable approximation of the segment rates. (5) Total average assets equal the greater of total average assets or the sum of total average liabilities and total average stockholders’ equity for each segment which contributes to the negative balances reported in "Other Items" to reconcile the results to the consolidated financial statements prepared in conformity with GAAP.

Off-Balance Sheet Arrangements,

Off-Balance Sheet Arrangements, Guarantees and Other Commitments	9 Months Ended
	Sep. 30, 2015
Disclosure Off Balance Sheet Arrangements Guarantees And Other Commitments Additional Information [Abstract]
Off-Balance Sheet Arrangements, Guarantees and Other Commitments	Off-Balance Sheet Arrangements, Guarantees and Other Commitments In the normal course of business we use financial instruments with off-balance sheet risk to meet the financing needs of our customers. These financial instruments include commitments to extend credit, commercial and standby letters of credit and commitments to invest in venture capital and private equity fund investments. These instruments involve credit risk to varying degrees. Credit risk is defined as the possibility of sustaining a loss because other parties to the financial instrument fail to perform in accordance with the terms of the contract. Commitments to Extend Credit The following table summarizes information related to our commitments to extend credit at September 30, 2015 and December 31, 2014 : (Dollars in thousands) September 30, 2015 December 31, 2014 Loan commitments available for funding: (1) Fixed interest rate commitments $ 1,393,396 $ 1,591,408 Variable interest rate commitments 13,302,099 11,860,039 Total loan commitments available for funding 14,695,495 13,451,447 Commercial and standby letters of credit (2) 1,391,812 1,254,338 Total unfunded credit commitments $ 16,087,307 $ 14,705,785 Commitments unavailable for funding (3) $ 2,141,183 $ 1,868,489 Maximum lending limits for accounts receivable factoring arrangements (4) 1,084,623 1,044,548 Reserve for unfunded credit commitments (5) 36,631 36,419 (1) Represents commitments which are available for funding, due to clients meeting all collateral, compliance and financial covenants required under loan commitment agreements. (2) See below for additional information on our commercial and standby letters of credit. (3) Represents commitments which are currently unavailable for funding, due to clients failing to meet all collateral, compliance and financial covenants under loan commitment agreements. (4) We extend credit under accounts receivable factoring arrangements when our clients’ sales invoices are deemed creditworthy under existing underwriting practices. (5) Our reserve for unfunded credit commitments includes an allowance for both our unfunded loan commitments and our letters of credit. Commercial and Standby Letters of Credit The table below summarizes our commercial and standby letters of credit at September 30, 2015 . The maximum potential amount of future payments represents the amount that could be remitted under letters of credit if there were a total default by the guaranteed parties, without consideration of possible recoveries under recourse provisions or from the collateral held or pledged. (Dollars in thousands) Expires In One Year or Less Expires After One Year Total Amount Outstanding Maximum Amount of Future Payments Financial standby letters of credit $ 1,251,147 $ 68,343 $ 1,319,490 $ 1,319,490 Performance standby letters of credit 50,220 10,209 60,429 60,429 Commercial letters of credit 11,893 — 11,893 11,893 Total $ 1,313,260 $ 78,552 $ 1,391,812 $ 1,391,812 Deferred fees related to financial and performance standby letters of credit were $8.9 million at September 30, 2015 and $8.4 million at December 31, 2014 . At September 30, 2015 , collateral in the form of cash of $587.5 million and available-for-sale securities of $0.6 million were available to us to reimburse losses, if any, under financial and performance standby letters of credit. Commitments to Invest in Venture Capital and Private Equity Funds Subject to applicable regulatory requirements, including the Volcker Rule, we make commitments to invest in venture capital and private equity funds, which in turn make investments generally in, or in some cases make loans to, privately-held companies. Commitments to invest in these funds are generally made for a 10 -year period from the inception of the fund. Although the limited partnership agreements governing these investments typically do not restrict the general partners from calling 100% of committed capital in one year, it is customary for these funds to generally call most of the capital commitments over 5 to 7 years; however in certain cases, the funds may not call 100% of committed capital over the life of the fund. The actual timing of future cash requirements to fund these commitments is generally dependent upon the investment cycle, overall market conditions, and the nature and type of industry in which the privately held companies operate. The following table details our total capital commitments, unfunded capital commitments, and our ownership percentage in each fund at September 30, 2015 : Our Ownership in Venture Capital and Private Equity Funds (Dollars in thousands) SVBFG Capital Commitments SVBFG Unfunded Commitments SVBFG Ownership of each Fund (4) Silicon Valley BancVentures, LP $ 6,000 $ 270 10.7 % SVB Capital Partners II, LP (1) 1,200 162 5.1 SVB Capital Shanghai Yangpu Venture Capital Fund 935 — 6.8 SVB Strategic Investors Fund, LP 15,300 688 12.6 SVB Strategic Investors Fund II, LP 15,000 1,050 8.6 SVB Strategic Investors Fund III, LP 15,000 1,275 5.9 SVB Strategic Investors Fund IV, LP 12,239 2,325 5.0 Strategic Investors Fund V Funds 515 177 Various SVB Capital Preferred Return Fund, LP 12,688 — 20.0 SVB Capital—NT Growth Partners, LP 24,670 1,340 33.0 Other private equity fund (2) 9,338 — 58.2 Debt funds 73,830 — Various Other fund investments (3) 299,977 12,064 Various Total $ 486,692 $ 19,351 (1) Our ownership includes direct ownership of 1.3 percent and indirect ownership interest of 3.8 percent through our investment in SVB Strategic Investors Fund II, LP. (2) Our ownership includes direct ownership of 41.5 percent and indirect ownership interests of 12.6 percent and 4.1 percent in the fund through our ownership interest of SVB Capital - NT Growth Partners, LP and SVB Capital Preferred Return Fund, LP, respectively. (3) Represents commitments to 276 funds (primarily venture capital funds) where our ownership interest is generally less than 5 percent of the voting interests of each such fund. (4) We are subject to the Volcker Rule, which restricts or limits us from sponsoring or having ownership interests in “covered” funds including venture capital and private equity funds. See “Business - Supervision and Regulation” under Item 1 of Part I of our 2014 Form 10-K. The following table details the amounts of remaining unfunded commitments to venture capital and private equity funds by our consolidated managed funds of funds (including our interest and the noncontrolling interests) at September 30, 2015 : Limited Partnership (Dollars in thousands) Unfunded Commitments SVB Strategic Investors Fund, LP $ 2,250 SVB Capital Preferred Return Fund, LP 4,673 SVB Capital—NT Growth Partners, LP 3,878 Other private equity fund 77 Total $ 10,878

Income Taxes

Income Taxes	9 Months Ended
	Sep. 30, 2015
Income Tax Disclosure [Abstract]
Income Taxes	Income Taxes We are subject to income tax in the U.S. federal jurisdiction and various state and foreign jurisdictions and have identified our federal tax return and tax returns in California and Massachusetts as major tax filings. Our U.S. federal tax returns for 2012 and subsequent years remain open to full examination. Our California tax returns for 2010 and subsequent tax years remain open to full examination. Massachusetts tax returns for 2011 and subsequent years remain open to full examination. At September 30, 2015 , our unrecognized tax benefit was $3.5 million , the recognition of which would reduce our income tax expense by $2.3 million . We do not expect that our unrecognized tax benefit will materially change in the next 12 months. We recognize interest and penalties related to income tax matters as part of income before income taxes. Interest and penalties were not material for the three and nine months ended September 30, 2015 .

Fair Value of Financial Instrum

Fair Value of Financial Instruments	9 Months Ended
	Sep. 30, 2015
Fair Value Disclosures [Abstract]
Fair Value of Financial Instruments	Fair Value of Financial Instruments Fair Value Measurements Our available-for-sale securities, derivative instruments and certain non-marketable and other securities are financial instruments recorded at fair value on a recurring basis. We make estimates regarding valuation of assets and liabilities measured at fair value in preparing our interim consolidated financial statements. Fair value is defined as the price that would be received to sell an asset or paid to transfer a liability (the “exit price”) in an orderly transaction between market participants at the measurement date. There is a three-level hierarchy for disclosure of assets and liabilities recorded at fair value. The classification of assets and liabilities within the hierarchy is based on whether the inputs to the valuation methodology used for measurement are observable or unobservable and the significance of those inputs in the fair value measurement. Observable inputs reflect market-derived or market-based information obtained from independent sources, while unobservable inputs reflect our estimates about market data and views of market participants. The three levels for measuring fair value are based on the reliability of inputs and are as follows: Level 1 Fair value measurements based on quoted prices in active markets for identical assets or liabilities that we have the ability to access. Since valuations are based on quoted prices that are readily and regularly available in an active market, valuation of these instruments does not entail a significant degree of judgment. Assets utilizing Level 1 inputs include U.S. Treasury securities, exchange-traded equity securities and certain marketable securities accounted for under fair value accounting. Level 2 Fair value measurements based on quoted prices in markets that are not active or for which all significant inputs are observable, directly or indirectly. Valuations for the available-for-sale securities are provided by third party external pricing service providers. We review the methodologies used to determine the fair value, including understanding the nature and observability of the inputs used to determine the price. Additional corroboration, such as obtaining a non-binding price from a broker, may be obtained depending on the frequency of trades of the security and the level of liquidity or depth of the market. The valuation methodology that is generally used for the Level 2 assets is the income approach. Below is a summary of the significant inputs used for each class of Level 2 assets and liabilities: U.S. agency debentures: Fair value measurements of U.S. agency debentures are based on the characteristics specific to bonds held, such as issuer name, coupon rate, maturity date and any applicable issuer call option features. Valuations are based on market spreads relative to similar term benchmark market interest rates, generally U.S. Treasury securities. Agency-issued mortgage-backed securities: Agency-issued mortgage-backed securities are pools of individual conventional mortgage loans underwritten to U.S. agency standards with similar coupon rates, tenor, and other attributes such as geographic location, loan size and origination vintage. Fair value measurements of these securities are based on observable price adjustments relative to benchmark market interest rates taking into consideration estimated loan prepayment speeds. Agency-issued collateralized mortgage obligations: Agency-issued collateralized mortgage obligations are structured into classes or tranches with defined cash flow characteristics and are collateralized by U.S. agency-issued mortgage pass-through securities. Fair value measurements of these securities incorporate similar characteristics of mortgage pass-through securities such as coupon rate, tenor, geographic location, loan size and origination vintage, in addition to incorporating the effect of estimated prepayment speeds on the cash flow structure of the class or tranche. These measurements incorporate observable market spreads over an estimated average life after considering the inputs listed above. Agency-issued commercial mortgage-backed securities: Fair value measurements of these securities are based on spreads to benchmark market interest rates (usually U.S. Treasury rates or rates observable in the swaps market), prepayment speeds, loan default rate assumptions and loan loss severity assumptions on underlying loans. Municipal bonds and notes: Bonds issued by municipal governments generally have stated coupon rates, final maturity dates and are subject to being called ahead of the final maturity date at the option of the issuer. Fair value measurements of these securities are priced based on spreads to other municipal benchmark bonds with similar characteristics; or, relative to market rates on U.S. Treasury bonds of similar maturity. Interest rate derivative assets and liabilities: Fair value measurements of interest rate derivatives are priced considering the coupon rate of the fixed leg of the contract and the variable coupon on the floating leg of the contract. Valuation is based on both spot and forward rates on the swap yield curve and the credit worthiness of the contract counterparty. Foreign exchange forward and option contract assets and liabilities: Fair value measurements of these assets and liabilities are priced based on spot and forward foreign currency rates and option volatility assumptions. Equity warrant assets (public portfolio): Fair value measurements of equity warrant assets of publicly-traded portfolio companies are valued based on the Black-Scholes option pricing model. The model uses the price of publicly-traded companies (underlying stock price), stated strike prices, warrant expiration dates, the risk-free interest rate and market-observable option volatility assumptions. Level 3 The fair value measurement is derived from valuation techniques that use significant assumptions not observable in the market. These unobservable assumptions reflect our own estimates of assumptions we believe market participants would use in pricing the asset. Below is a summary of the valuation techniques used for each class of Level 3 assets: Other venture capital investments: Fair value measurements are based on consideration of a range of factors including, but not limited to, the price at which the investment was acquired, the term and nature of the investment, local market conditions, values for comparable securities, and as it relates to the private company, the current and projected operating performance, exit strategies and financing transactions subsequent to the acquisition of the investment. The significant unobservable inputs used in the fair value measurement include the information about each portfolio company, including actual and forecasted results, cash position, recent or planned transactions and market comparable companies. Significant changes to any one of these inputs in isolation could result in a significant change in the fair value measurement, however, we generally consider all factors available through ongoing communication with the portfolio companies and venture capital fund managers to determine whether there are changes to the portfolio company or the environment that indicate a change in the fair value measurement. Other securities: Fair value measurements of equity securities of public companies are priced based on quoted market prices less a discount if the securities are subject to certain sales restrictions. Marketability discounts generally range from 10% to 20% depending on the duration of the sale restrictions which typically range from 3 to 6 months. Equity warrant assets (public portfolio): Fair value measurements of equity warrant assets of publicly-traded portfolio companies are valued based on the Black-Scholes option pricing model. The model uses the price of publicly-traded companies (underlying stock price), stated strike prices, warrant expiration dates, the risk-free interest rate and market-observable option volatility assumptions. Modeled asset values are further adjusted by applying a discount of up to 20% for certain warrants that have lock-up restrictions or other features that indicate a discount to fair value is warranted. As a lock-up term nears, and other sale restrictions are lifted, discounts are adjusted downward to 0 percent once all restrictions expire or are removed. Equity warrant assets (private portfolio): Fair value measurements of equity warrant assets of private portfolio companies are priced based on a modified Black-Scholes option pricing model to estimate the asset value by using stated strike prices, option expiration dates, risk-free interest rates and option volatility assumptions. Option volatility assumptions used in the modified Black-Scholes model are based on public market indices whose members operate in similar industries as companies in our private company portfolio. Option expiration dates are modified to account for estimates to actual life relative to stated expiration. Overall model asset values are further adjusted for a general lack of liquidity due to the private nature of the associated underlying company. There is a direct correlation between changes in the volatility and remaining life assumptions in isolation and the fair value measurement while there is an inverse correlation between changes in the liquidity discount assumption and the fair value measurement. It is our policy to maximize the use of observable inputs and minimize the use of unobservable inputs when developing fair value measurements. When available, we use quoted market prices to measure fair value. If market prices are not available, fair value measurement is based upon valuation techniques that use primarily market-based or independently-sourced market parameters, including interest rate yield curves, prepayment speeds, option volatilities and currency rates. Substantially all of our financial instruments use the foregoing methodologies, and are categorized as a Level 1 or Level 2 measurement in the fair value hierarchy. However, in certain cases, when market observable inputs for our valuation techniques may not be readily available, we are required to make judgments about assumptions we believe market participants would use in estimating the fair value of the financial instrument, and based on the significance of those judgments, the measurement may be determined to be a Level 3 fair value measurement. The degree of management judgment involved in determining the fair value of a financial instrument is dependent upon the availability of quoted market prices or observable market parameters. For financial instruments that trade actively and have quoted market prices or observable market parameters, there is minimal subjectivity involved in measuring fair value. When observable market prices and parameters are not fully available, management judgment is necessary to estimate fair value. For inactive markets, there is little information, if any, to evaluate if individual transactions are orderly. Accordingly, we are required to estimate, based upon all available facts and circumstances, the degree to which orderly transactions are occurring and provide more weighting to price quotes that are based upon orderly transactions. In addition, changes in the market conditions may reduce the availability of quoted prices or observable data. For example, reduced liquidity in the capital markets or changes in secondary market activities could result in observable market inputs becoming unavailable. Therefore, when market data is not available, we use valuation techniques requiring more management judgment to estimate the appropriate fair value measurement. Accordingly, the degree of judgment exercised by management in determining fair value is greater for financial assets and liabilities categorized as Level 3. The following fair value hierarchy table presents information about our assets and liabilities that are measured at fair value on a recurring basis as of September 30, 2015 : (Dollars in thousands) Level 1 Level 2 Level 3 Balance at September 30, 2015 Assets Available-for-sale securities: U.S. treasury securities $ 10,197,025 $ — $ — $ 10,197,025 U.S. agency debentures — 2,942,968 — 2,942,968 Residential mortgage-backed securities: Agency-issued collateralized mortgage obligations - fixed rate — 1,517,702 — 1,517,702 Agency-issued collateralized mortgage obligations - variable rate — 645,288 — 645,288 Equity securities 691 3,987 — 4,678 Total available-for-sale securities 10,197,716 5,109,945 — 15,307,661 Non-marketable and other securities (fair value accounting): Non-marketable securities: Venture capital and private equity fund investments measured at net asset value (1) — — — 154,660 Other venture capital investments — — 3,390 3,390 Other securities 779 — — 779 Total non-marketable and other securities (fair value accounting) 779 — 3,390 158,829 Other assets: Interest rate swaps — 3,485 — 3,485 Foreign exchange forward and option contracts — 33,271 — 33,271 Equity warrant assets — 1,648 128,443 130,091 Client interest rate derivatives — 5,164 — 5,164 Total assets (2) $ 10,198,495 $ 5,153,513 $ 131,833 $ 15,638,501 Liabilities Foreign exchange forward and option contracts $ — $ 28,939 $ — $ 28,939 Client interest rate derivatives — 5,719 — 5,719 Total liabilities $ — $ 34,658 $ — $ 34,658 (1) In accordance with the accounting standard (ASU 2015-07, Fair Value Measurement (Topic 820)), certain investments that are measured at fair value using the net asset value per share (or its equivalent) practical expedient have not been classified in the fair value hierarchy. The fair value amounts presented in this table are intended to permit reconciliation of the fair value hierarchy to the amounts presented in the statement of financial position. See Note 1— "Basis of Presentation" of the "Notes to Interim Consolidated Financial Statements" under Part I, Item 1 in this report. (2) Included in Level 1 and Level 3 assets are $0.6 million and $3 million , respectively, attributable to noncontrolling interests calculated based on the ownership percentages of the noncontrolling interests. The following fair value hierarchy table presents information about our assets and liabilities that are measured at fair value on a recurring basis as of December 31, 2014 : (Dollars in thousands) Level 1 Level 2 Level 3 Balance at December 31, 2014 Assets Available-for-sale securities: U.S. treasury securities $ 7,302,273 $ — $ — $ 7,302,273 U.S. agency debentures — 3,561,556 — 3,561,556 Residential mortgage-backed securities: Agency-issued collateralized mortgage obligations - fixed rate — 1,884,843 — 1,884,843 Agency-issued collateralized mortgage obligations - variable rate — 784,475 — 784,475 Equity securities 4,290 3,218 — 7,508 Total available-for-sale securities 7,306,563 6,234,092 — 13,540,655 Non-marketable and other securities (fair value accounting): Non-marketable securities: Venture capital and private equity fund investments measured at net asset value (1) — — — 1,130,882 Other venture capital investments — — 71,204 71,204 Other securities 108,251 — — 108,251 Total non-marketable and other securities (fair value accounting) 108,251 — 71,204 1,310,337 Other assets: Interest rate swaps — 4,609 — 4,609 Foreign exchange forward and option contracts — 34,231 — 34,231 Equity warrant assets — 1,906 114,698 116,604 Client interest rate derivatives — 2,546 — 2,546 Total assets (2) $ 7,414,814 $ 6,277,384 $ 185,902 $ 15,008,982 Liabilities Foreign exchange forward and option contracts $ — $ 28,363 $ — $ 28,363 Client interest rate derivatives — 2,748 — 2,748 Total liabilities $ — $ 31,111 $ — $ 31,111 (1) In accordance with the accounting standard (ASU 2015-07, Fair Value Measurement (Topic 820)), certain investments that are measured at fair value using the net asset value per share (or its equivalent) practical expedient have not been classified in the fair value hierarchy. See Note 1— "Basis of Presentation" of the "Notes to Interim Consolidated Financial Statements" under Part I, Item 1 in this report. (2) Included in Level 1 and Level 3 assets are $100 million and $69 million , respectively, attributable to noncontrolling interests calculated based on the ownership percentages of the noncontrolling interests. The following table presents additional information about Level 3 assets measured at fair value on a recurring basis for the three and nine months ended September 30, 2015 and 2014 , respectively: (Dollars in thousands) Beginning Balance Total Realized and Unrealized Gains Included in Income Purchases Sales Issuances Distributions and Other Settlements Transfers Out of Level 3 Ending Balance Three months ended September 30, 2015 Non-marketable and other securities (fair value accounting): Other venture capital investments $ 3,390 $ 15 $ — $ — $ — $ (15 ) $ — $ 3,390 Total non-marketable and other securities (fair value accounting) (1) 3,390 15 — — — (15 ) — 3,390 Other assets: Equity warrant assets (2) 120,037 11,551 — (6,215 ) 3,057 499 (486 ) 128,443 Total assets $ 123,427 $ 11,566 $ — $ (6,215 ) $ 3,057 $ 484 $ (486 ) $ 131,833 Three months ended September 30, 2014 Non-marketable and other securities (fair value accounting): Other venture capital investments $ 43,747 $ 5,546 $ 6,304 $ (11,122 ) $ — $ (612 ) $ — $ 43,863 Other securities (fair value accounting) 5,808 — — — — — (5,808 ) — Total non-marketable and other securities (fair value accounting) (1) 49,555 5,546 6,304 (11,122 ) — (612 ) (5,808 ) 43,863 Other assets: Equity warrant assets (2) 87,151 13,805 — (10,564 ) 2,932 510 (437 ) 93,397 Total assets $ 136,706 $ 19,351 $ 6,304 $ (21,686 ) $ 2,932 $ (102 ) $ (6,245 ) $ 137,260 Nine months ended September 30, 2015 Non-marketable and other securities (fair value accounting): Other venture capital investments (3) $ 3,291 $ 146 $ — $ (32 ) $ — $ (15 ) $ — $ 3,390 Total non-marketable and other securities (fair value accounting) (1) 3,291 146 — (32 ) — (15 ) — 3,390 Other assets: Equity warrant assets (2) 114,698 54,884 — (48,374 ) 7,607 1,249 (1,621 ) 128,443 Total assets $ 117,989 $ 55,030 $ — $ (48,406 ) $ 7,607 $ 1,234 $ (1,621 ) $ 131,833 Nine months ended September 30, 2014 Non-marketable and other securities (fair value accounting): Other venture capital investments $ 32,839 $ 8,060 $ 22,800 $ (15,561 ) $ — $ (4,149 ) $ (126 ) $ 43,863 Other securities (fair value accounting) 319,249 104,310 — (46,840 ) — 3,417 (380,136 ) — Total non-marketable and other securities (fair value accounting) (1) 352,088 112,370 22,800 (62,401 ) — (732 ) (380,262 ) 43,863 Other assets: Equity warrant assets (2) 99,891 51,325 — (67,201 ) 9,098 1,718 (1,434 ) 93,397 Total assets $ 451,979 $ 163,695 $ 22,800 $ (129,602 ) $ 9,098 $ 986 $ (381,696 ) $ 137,260 (1) Realized and unrealized gains (losses) are recorded in the line items “gains on investment securities, net” a component of noninterest income. (2) Realized and unrealized gains (losses) are recorded in the line item “gains on derivative instruments, net”, a component of noninterest income. (3) Beginning balance was adjusted to conform with our adoption of the new accounting standard (ASU 2015-02), Amendments to the Consolidation Analysis (Topic 820). The following table presents the amount of net unrealized gains and losses included in earnings (which is inclusive of noncontrolling interest) attributable to Level 3 assets still held at September 30, 2015 and 2014 : Three months ended September 30, Nine months ended September 30, (Dollars in thousands) 2015 2014 2015 2014 Non-marketable and other securities (fair value accounting): Other venture capital investments — (1,231 ) 158 78 Other securities — — — 78,967 Total non-marketable and other securities (fair value accounting) (1) — (1,231 ) 158 79,045 Other assets: Equity warrant assets (2) 9,115 6,911 21,597 17,777 Total unrealized gains, net $ 9,115 $ 5,680 $ 21,755 $ 96,822 Unrealized gains (losses) attributable to noncontrolling interests $ — $ (1,137 ) $ 141 $ 72,574 (1) Unrealized gains (losses) are recorded in the line items “gains on investment securities, net”, a component of noninterest income. (2) Unrealized gains (losses) are recorded in the line item “gains on derivative instruments, net”, a component of noninterest income. The following table presents quantitative information about the significant unobservable inputs used for certain of our Level 3 fair value measurements at September 30, 2015 and December 31, 2014. We have not included in this table our venture capital and private equity fund investments (fair value accounting) as we use net asset value per share (as obtained from the general partners of the investments) as a practical expedient to determine fair value. (Dollars in thousands) Fair value Valuation Technique Significant Unobservable Inputs Weighted Average September 30, 2015: Other venture capital investments (fair value accounting) $ 3,390 Private company equity pricing (1) (1 ) Equity warrant assets (public portfolio) — 4,795 Modified Black-Scholes option pricing model Volatility 39.4 % — Risk-Free interest rate 1.5 % Sales restrictions discount (2) 14.2 % Equity warrant assets (private portfolio) 123,648 Modified Black-Scholes option pricing model Volatility 37.1 % Risk-Free interest rate 0.7 % Marketability discount (3) 17.3 % Remaining life assumption (4) 45.0 % December 31, 2014: Other venture capital investments (fair value accounting) $ 71,204 Private company equity pricing (1) (1 ) Equity warrant assets (public portfolio) 1,681 Modified Black-Scholes option pricing model Volatility 42.6 % Risk-Free interest rate 1.7 % Sales restrictions discount (2) 17.8 % Equity warrant assets (private portfolio) 113,017 Modified Black-Scholes option pricing model Volatility 38.3 % Risk-Free interest rate 0.9 % Marketability discount (3) 20.0 % Remaining life assumption (4) 45.0 % (1) In determining the fair value of our other venture capital investment portfolio, we evaluate a variety of factors related to each underlying private portfolio company including, but not limited to, actual and forecasted results, cash position, recent or planned transactions and market comparable companies. Additionally, we have ongoing communication with the portfolio companies and venture capital fund managers, to determine whether there is a material change in fair value. These factors are specific to each portfolio company and a weighted average or range of values of the unobservable inputs is not meaningful. (2) We adjust quoted market prices of public companies, which are subject to certain sales restrictions. Sales restriction discounts generally range from 10% to 20% depending on the duration of the sales restrictions, which typically range from 3 to 6 months. (3) Our marketability discount is applied to all private company warrants to account for a general lack of liquidity due to the private nature of the associated underlying company. The quantitative measure used is based upon various option-pricing models. On a quarterly basis, a sensitivity analysis is performed on our marketability discount. (4) We adjust the contractual remaining term of private company warrants based on our estimate of the actual remaining life, which we determine by utilizing historical data on cancellations and exercises. At September 30, 2015 , the weighted average contractual remaining term was 5.67 years, compared to our estimated remaining life of 2.55 years. On a quarterly basis, a sensitivity analysis is performed on our remaining life assumption. For the three and nine months ended September 30, 2015 and 2014 , we did not have any material transfers between Level 2 and Level 1. We did not have any transfers from Level 3 to Level 1 for the nine months ended September 30, 2015 . Transfers from Level 3 to Level 1 for the nine months ended September 30, 2014 included $380.3 million as a result of the expiration of lock-up and other restrictions on certain of our other securities. All other transfers from Level 3 to Level 2 for the three and nine months ended September 30, 2015 and 2014 were due to the transfer of equity warrant assets from our private portfolio to our public portfolio (see our Level 3 reconciliation above). All amounts reported as transfers represent the fair value as of the date of the change in circumstances that caused the transfer. Financial Instruments not Carried at Fair Value FASB guidance over financial instruments requires that we disclose estimated fair values for our financial instruments not carried at fair value. Fair value estimates, methods and assumptions, set forth below for our financial instruments, are made solely to comply with these requirements. Fair values are based on estimates or calculations at the transaction level using present value techniques in instances where quoted market prices are not available. Because broadly traded markets do not exist for many of our financial instruments, the fair value calculations attempt to incorporate the effect of current market conditions at a specific time. The aggregation of the fair value calculations presented herein does not represent, and should not be construed to represent, the underlying value of the Company. The following describes the methods and assumptions used in estimating the fair values of financial instruments for which carrying value approximates fair value and estimated fair values of financial instruments not recorded at fair value on a recurring basis and excludes financial instruments and assets and liabilities already recorded at fair value as described above. Financial Instruments for which Carrying Value Approximates Fair Value Certain financial instruments that are not carried at fair value on the Consolidated Balance Sheets are carried at amounts that approximate fair value, due to their short-term nature and generally negligible credit risk. These instruments include cash and cash equivalents; FHLB and FRB stock; accrued interest receivable; short-term borrowings; short-term time deposits; and accrued interest payable. In addition, U.S. GAAP requires that the fair value of deposit liabilities with no stated maturity (i.e., demand, savings and certain money market deposits) be equal to their carrying value; recognition of the inherent funding value of these instruments is not permitted. Estimated Fair Values of Financial Instruments Not Recorded at Fair Value on a Recurring Basis Held-to-Maturity Securities Held-to-maturity securities include similar investments held in our available-for-sale securities portfolio and are valued using the same methodologies. All securities included in our held-to-maturity securities portfolio are valued using Level 2 inputs. Refer to Level 2 fair value measurements above for significant inputs used in the valuation of our held-to-maturity investment securities. Non-Marketable Securities (Cost and Equity Method Accounting) Non-marketable securities includes other investments (equity method accounting), venture capital and private equity fund investments (cost method accounting), and other venture capital investments (cost method accounting). Other investments (equity method accounting) includes our investment in our joint venture bank in China. At this time, the carrying value of our investment in our joint venture bank in China is a reasonable estimate of fair value. The fair value of the remaining other investments (equity method accounting) and the fair value of venture capital and private equity fund investments (cost method accounting) and other venture capital investments (cost method accounting) is based on financial information obtained from the investee or obtained from the fund investments’ or debt fund investments’ respective general partners. For private company investments, estimated fair value is based on consideration of a range of factors including, but not limited to, the price at which the investment was acquired, the term and nature of the investment, local market conditions, values for comparable securities, current and projected operating performance, exit strategies, and financing transactions subsequent to the acquisition of the investment. For our fund investments, we utilize the net asset value per share as obtained from the general partners of the investments. We adjust the net asset value per share for differences between our measurement date and the date of the fund investment’s net asset value by using the most recently available financial information from the investee general partner, for example June 30 th , for our September 30 th consolidated financial statements, adjusted for any contributions paid, distributions received from the investment, and significant fund transactions or market events during the reporting period. Loans The fair value of fixed and variable rate loans is estimated by discounting contractual cash flows using rates that reflect current pricing for similar loans and the projected forward yield curve. This method is not based on the exit price concept of fair value required under ASC 820, Fair Value Measurements and Disclosures . Long-Term Deposits The fair value of long-term time deposits is estimated by discounting the cash flows using our cost of borrowings and the projected forward yield curve over their remaining contractual term. Long-Term Debt The fair value of long-term debt is generally based on quoted market prices, when available, or is estimated based on calculations utilizing third-party pricing services and current market spread, price indications from reputable dealers or observable market prices of the underlying instrument(s), whichever is deemed more reliable. Also included in the estimated fair value of our 6.05% Subordinated Notes are amounts related to hedge accounting associated with the notes. Off-Balance Sheet Financial Instruments The fair value of net available commitments to extend credit is estimated based on the average amount we would receive or pay to execute a new agreement with identical terms and pricing, while taking into account the counterparties’ credit standing. Letters of credit are carried at their fair value, which was equivalent to the residual premium or fee at September 30, 2015 and December 31, 2014 . Commitments to extend credit and letters of credit typically result in loans with a market interest rate if funded. The following fair value hierarchy table presents the estimated fair values of our financial instruments that are not carried at fair value at September 30, 2015 and December 31, 2014 : Estimated Fair Value (Dollars in thousands) Carrying Amount Total Level 1 Level 2 Level 3 September 30, 2015: Financial assets: Cash and cash equivalents $ 1,674,145 $ 1,674,145 $ 1,674,145 $ — $ — Held-to-maturity securities 8,306,526 8,367,003 — 8,367,003 — Non-marketable securities (cost and equity method accounting) not measured at net asset value 112,984 115,359 — — 115,359 Non-marketable securities (cost and equity method) accounting measured at net asset value (1) 253,210 374,353 — — — Net commercial loans 13,470,144 13,547,022 — — 13,547,022 Net consumer loans 1,646,929 1,618,492 — — 1,618,492 FHLB and Federal Reserve Bank stock 46,116 46,116 — — 46,116 Accrued interest receivable 98,453 98,453 — 98,453 — Financial liabilities: Other short-term borrowings 3,756 3,756 3,756 — — Non-maturity deposits (2) 36,977,199 36,977,199 36,977,199 — — Time deposits 72,218 72,218 — 72,218 — 3.50% Senior Notes 346,591 342,125 — 342,125 — 5.375% Senior Notes 346,878 391,286 — 391,286 — 6.05% Subordinated Notes (3) 49,028 51,000 — 51,000 — 7.0% Junior Subordinated Debentures 54,714 52,557 — 52,557 — Accrued interest payable 4,992 4,992 — 4,992 — Off-balance sheet financial assets: Commitments to extend credit — 28,805 — — 28,805 December 31, 2014: Financial assets: Cash and cash equivalents $ 1,796,062 $ 1,796,062 $ 1,796,062 $ — $ — Held-to-maturity securities 7,421,042 7,415,656 — 7,415,656 — Non-marketable securities (cost and equity method accounting) not measured at net asset value 108,221 107,451 — — 107,451 Non-marketable securities (cost and equity method) accounting measured at net asset value (1) 188,427 283,119 — — — Net commercial loans 12,947,869 13,082,487 — — 13,082,487 Net consumer loans 1,271,048 1,247,336 — — 1,247,336 FHLB and Federal Reserve Bank stock 53,496 53,496 — — 53,496 Accrued interest receivable 94,180 94,180 — 94,180 — Financial liabilities: Other short-term borrowings 7,781 7,781 7,781 — — Non-maturity deposits (2) 34,215,372 34,215,372 34,215,372 — — Time deposits 128,127 128,107 — 12

Legal Matters

Legal Matters	9 Months Ended
	Sep. 30, 2015
Commitments and Contingencies Disclosure [Abstract]
Legal Matters	Legal Matters Certain lawsuits and claims arising in the ordinary course of business have been filed or are pending against us or our affiliates. In accordance with applicable accounting guidance, we establish accruals for all lawsuits, claims and expected settlements when we believe it is probable that a loss has been incurred and the amount of the loss is reasonably estimable. When a loss contingency is not both probable and estimable, we do not establish an accrual. Any such loss estimates are inherently uncertain, based on currently available information and are subject to management’s judgment and various assumptions. Due to the inherent subjectivity of these estimates and unpredictability of outcomes of legal proceedings, any amounts accrued may not represent the ultimate resolution of such matters. To the extent we believe any potential loss relating to such lawsuits and claims may have a material impact on our liquidity, consolidated financial position, results of operations, and/or our business as a whole and is reasonably possible but not probable, we disclose information relating to any such potential loss, whether in excess of any established accruals or where there is no established accrual. We also disclose information relating to any material potential loss that is probable but not reasonably estimable. Where reasonably practicable, we will provide an estimate of loss or range of potential loss. No disclosures are generally made for any loss contingencies that are deemed to be remote. Based upon information available to us, our review of lawsuits and claims filed or pending against us to date and consultation with our outside legal counsel, we have not recognized a material accrual liability for these matters, nor do we currently expect it is reasonably possible that these matters will result in a material liability to the Company. However, the outcome of litigation and other legal and regulatory matters is inherently uncertain, and it is possible that one or more of such matters currently pending or threatened could have an unanticipated material adverse effect on our liquidity, consolidated financial position, results of operations, and/or our business as a whole, in the future.

Related Parties

Related Parties	9 Months Ended
	Sep. 30, 2015
Related Party Transactions [Abstract]
Related Parties	Related Parties During the nine months ended September 30, 2015 , the Bank made loans to related parties, including certain companies in which certain of our directors or their affiliated venture funds are beneficial owners of ten percent or more of the equity securities of such companies. Such loans: (a) were made in the ordinary course of business; (b) were made on substantially the same terms, including interest rates and collateral, as those prevailing at the time for comparable transactions with other non-related persons; and (c) did not involve more than the normal risk of collectability or present other unfavorable features. Additionally, we also provide real estate secured loans to eligible employees through our EHOP.

Basis of Presentation (Policies

Basis of Presentation (Policies)	9 Months Ended
	Sep. 30, 2015
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Principles of Consolidation and Presentation	Principles of Consolidation and Presentation Prior to April 1, 2015, the Company’s consolidated financial statements included the accounts of SVB Financial Group and entities in which we had a controlling interest. The determination of whether we had controlling interest was based on consolidation principles prescribed by ASC Topic 810 and whether the controlling interest in an entity was a voting interest entity or a variable interest entity (“VIE”). However, during the three months ended June 30, 2015, we early adopted the provisions of ASU 2015-02, Amendments to the Consolidation Analysis (ASU 2015-02)(see "Adoption of New Accounting Standards" below), which simplifies consolidation accounting by reducing the number of consolidation models and changing various aspects of current GAAP, including certain consolidation criteria for variable interest entities. The new guidance eliminates the presumption that a general partner of a limited partnership arrangement should consolidate a limited partnership. The amendments to ASC Topic 810 in ASU 2015-02 modify the evaluation of whether limited partnerships and similar entities are VIEs or voting entities. With these changes, we determined that the majority of our investments in limited partnership arrangements are VIEs under the new guidance while these entities were typically voting interest entities under the prior guidance. ASU 2015-02 provided a single model for evaluating VIE entities for consolidation. VIEs are entities where investors lack sufficient equity at risk for the entity to finance its activities without additional subordinated financial support or equity investors, as a group, lack one of the following characteristics: (a) the power to direct the activities that most significantly impact the entity’s economic performance, (b) the obligation to absorb the expected losses of the entity, or (c) the right to receive the expected returns of the entity. We assess VIEs to determine if we are the primary beneficiary of a VIE. A primary beneficiary is defined as a variable interest holder that has a controlling financial interest. A controlling financial interest requires both: (a) power to direct the activities that most significantly impact the VIE’s economic performance, and (b) obligation to absorb losses or receive benefits of a VIE that could potentially be significant to a VIE. Under this analysis, we evaluate kick-out rights and other participating rights which could provide us a controlling financial interest. The primary beneficiary of a VIE is required to consolidate the VIE. ASU 2015-02 also changed how we evaluate fees paid to managers of our limited partnership investments. Under the new guidance, we exclude those fee arrangements that are not deemed to be variable interests from the analysis of our interests in our investments in VIEs and the determination of a primary beneficiary, if any. Our consolidated financial statements include the accounts of SVB Financial Group and consolidated entities. We consolidate voting entities in which we have control through voting interests. We determine whether we have a controlling financial interest in a VIE by determining if we have the power to direct the activities of the VIE that most significantly impact the entity’s economic performance and whether we have significant variable interests. Generally, we have significant variable interests if our commitments to a limited partnership investment represent a significant amount of the total commitments to the entity. We also evaluate the impact of related parties on our determination of variable interests in our consolidation conclusions. We consolidate VIEs in which we are the primary beneficiary based on a controlling financial interest. If we are not the primary beneficiary of a VIE, we record our pro-rata interests or our cost basis in the VIE, as appropriate, based on other accounting guidance within GAAP. All significant intercompany accounts and transactions with consolidated entities have been eliminated. We have not provided financial or other support during the periods presented to any VIE that we were not previously contractually required to provide.
Adoption Accounting Pronouncements	Adoption of New Accounting Standards In May 2015, the FASB issued a new accounting standard (ASU 2015-07, Fair Value Measurement (Topic 820)), which removes the requirement to categorize within the fair value hierarchy all investments for which fair value is measured using the net asset value per share practical expedient. The standard is required to be applied retrospectively to all periods presented. The guidance will be effective for fiscal years beginning after December 15, 2015, with early adoption permitted. We early adopted this guidance in the second quarter of 2015. The adoption of this guidance impacts our fair value disclosures and has no impact on our financial position, results of operations or stockholders' equity. In April 2015, the FASB issued a new accounting standard (ASU 2015-03, Interest- Imputation of Interest (Subtopic 835-30), which simplifies the presentation of debt issuance costs. The guidance will be effective for annual and quarterly periods beginning on January 1, 2016, with early adoption permitted. We early adopted this guidance in the third quarter of 2015 using the retrospective method, which required the restatement of prior period results. The adoption of this guidance impacted our statement of financial position, but had no impact on our results of operations or retained earnings. We reclassified $5.1 million and $2.1 million of debt issuance costs from other assets to a direct deduction from the carrying amounts of long-term debt for the periods ended September 30, 2015, and December 31, 2014, respectively. In February 2015, the FASB issued a new accounting standard, ASU 2015-02, which amends the consolidation requirement for certain legal entities. As outlined above in "Principles of Consolidation and Presentation", we early adopted this guidance in the second quarter of 2015 using the modified retrospective method, which results in an effective date of adoption of January 1, 2015 and will not require the restatement of prior period results. The adoption of this guidance impacted our statement of financial position and results of operations, but had no impact on retained earnings, SVBFG stockholders' equity or net income as investments that were consolidated in previous reporting periods are now deconsolidated and no new investments were consolidated. Refer to Note 4—”Variable Interest Entities” of the “Notes to Interim Consolidated Financial Statements (unaudited)” under Part I, Item 1 of this report for additional details regarding our assessment of the adoption of this guidance. In January 2014, the FASB issued a new accounting standard (ASU 2014-01, Investments - Equity Method and Joint Ventures (Topic 323), Accounting for Investments in Qualified Affordable Housing Projects), which is effective for us for interim and annual reporting periods beginning after December 15, 2014. The standard is required to be applied retrospectively, with an adjustment to retained earnings in the earliest period presented. The ASU is applicable to our portfolio of low income housing tax credit ("LIHTC") partnership interests. We adopted this guidance in the first quarter of 2015. For prior periods, pursuant to ASU 2014-01, (i) amortization expense related to our low income housing tax credits was reclassified from Other noninterest expense to Income tax expense, (ii) additional amortization, net of the associated tax benefits, was recognized in Income tax expense as a result of our adoption of the proportional amortization method and (iii) net deferred tax assets, related to our low income housing tax investments, were written-off. The cumulative effect to retained earnings as of January 1, 2015 of adopting this guidance was a reduction of $4.7 million , inclusive of a $4.6 million reduction to retained earnings as of January 1, 2014. Our previously reported net income and diluted earnings per share for the three and nine months ended September 30, 2014 were not materially impacted by the adoption of ASU 2014-01. Recent Accounting Pronouncements In May 2014, the FASB issued a new accounting standard (ASU 2014-09, Revenue from Contracts with Customers (Topic 606)), which provides revenue recognition guidance that is intended to create greater consistency with respect to how and when revenue from contracts with customers is shown in the income statement. This guidance will be effective on a retrospective basis beginning on January 1, 2018. We do not expect the adoption of this guidance to have a material impact on our financial position, results of operations or stockholders' equity. In August 2014, the FASB issued a new accounting standard (ASU 2014-15, Going Concern (Topic 205-40)), which requires management to evaluate for each annual and interim reporting period whether there is substantial doubt about an entity's ability to continue as a going concern. The guidance will be effective for annual and quarterly periods beginning on or after December 15, 2016, with early adoption permitted. We are currently developing processes and controls to adopt this guidance by the adoption deadline and do not expect the adoption of this guidance to have a material impact on our financial position, results of operations or stockholders' equity.
Reclassifications	Reclassifications Certain prior period amounts, including amounts related to the adoption of ASU 2014-01, ASU 2015-02 and ASU 2015-03, have been reclassified to conform to current period presentations.

Stockholders' Equity and EPS (T

Stockholders' Equity and EPS (Tables)	9 Months Ended
	Sep. 30, 2015
Equity and Earnings Per Share [Abstract]
Reclassifications out of AOCI	The following table summarizes the items reclassified out of accumulated other comprehensive income into the Consolidated Statements of Income (unaudited) for the three and nine months ended September 30, 2015 and 2014 : Three months ended September 30, Nine months ended September 30, (Dollars in thousands) Income Statement Location 2015 2014 2015 2014 Reclassification adjustment for (gains) losses included in net income Gains (losses) on investment securities, net $ (13 ) $ 990 $ (2,750 ) $ 17,411 Related tax expense (benefit) Income tax expense 6 (400 ) 1,111 (7,030 ) Total reclassification adjustment for (gains) losses included in net income, net of tax $ (7 ) $ 590 $ (1,639 ) $ 10,381
Reconciliation of Basic EPS to Diluted EPS	The following is a reconciliation of basic EPS to diluted EPS for the three and nine months ended September 30, 2015 and 2014 : Three months ended September 30, Nine months ended September 30, (Dollars and shares in thousands, except per share amounts) 2015 2014 2015 2014 Numerator: Net income available to common stockholders (1) $ 81,733 $ 63,977 $ 256,392 $ 205,880 Denominator: Weighted average common shares outstanding-basic 51,479 50,752 51,254 48,281 Weighted average effect of dilutive securities: Stock options and ESPP 382 534 411 580 Restricted stock units 187 285 213 339 Denominator for diluted calculation 52,048 51,571 51,878 49,200 Earnings per common share: Basic (1) $ 1.59 $ 1.26 $ 5.00 $ 4.26 Diluted $ 1.57 $ 1.24 $ 4.94 $ 4.18 (1) 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 1— "Basis of Presentation" of the "Notes to Interim Consolidated Financial Statements" under Part I, Item 1 in this report.
Common Shares Excluded from Diluted EPS Calculation as They Were Deemed to be Anti-Dilutive	The following table summarizes the weighted-average common shares excluded from the diluted EPS calculation as they were deemed to be antidilutive for the three and nine months ended September 30, 2015 and 2014 : Three months ended September 30, Nine months ended September 30, (Shares in thousands) 2015 2014 2015 2014 Stock options 142 241 169 140 Restricted stock units 1 1 — 2 Total 143 242 169 142

Share-Based Compensation (Table

Share-Based Compensation (Tables)	9 Months Ended
	Sep. 30, 2015
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Share Based Compensation and Related Benefits	For the three and nine months ended September 30, 2015 and 2014 , we recorded share-based compensation and related tax benefits as follows: Three months ended September 30, Nine months ended September 30, (Dollars in thousands) 2015 2014 2015 2014 Share-based compensation expense $ 8,188 $ 7,520 $ 24,174 $ 22,285 Income tax benefit related to share-based compensation expense (3,051 ) (2,676 ) (8,381 ) (7,351 )
Unrecognized Share Based Compensation Expense	As of September 30, 2015 , unrecognized share-based compensation expense was as follows: (Dollars in thousands) Unrecognized Expense Average Expected Recognition Period - in Years Stock options $ 12,756 2.45 Restricted stock units 41,726 2.64 Total unrecognized share-based compensation expense $ 54,482
Stock Option Information Related to Equity Incentive Plan	The table below provides stock option information related to the 2006 Equity Incentive Plan for the nine months ended September 30, 2015 : Options Weighted Average Exercise Price Weighted Average Remaining Contractual Life in Years Aggregate Intrinsic Value of In-The- Money Options Outstanding at December 31, 2014 1,394,888 $ 66.03 Granted 122,120 129.30 Exercised (311,575 ) 51.34 Forfeited (22,008 ) 84.40 Expired (1,520 ) 48.76 Outstanding at September 30, 2015 1,181,905 76.12 4.00 $ 48,295,069 Vested and expected to vest at September 30, 2015 1,145,732 75.24 3.95 47,717,566 Exercisable at September 30, 2015 656,191 60.34 3.01 36,230,256
Information for Restricted Stock Units under Equity Incentive Plan	The table below provides information for restricted stock units under the 2006 Equity Incentive Plan for the nine months ended September 30, 2015 : Shares Weighted Average Grant Date Fair Value Nonvested at December 31, 2014 614,666 $ 79.92 Granted 231,205 129.22 Vested (211,652 ) 74.02 Forfeited (19,292 ) 88.51 Nonvested at September 30, 2015 614,927 101.01

Variable Interest Entities (Tab

Variable Interest Entities (Tables)	9 Months Ended
	Sep. 30, 2015
Investments In Variable Interest Entities [Abstract]
Schedule of Variable Interest Entities	The following table presents the carrying amounts and classification of significant variable interests in consolidated and unconsolidated VIEs as of September 30, 2015: (Dollars in thousands) Consolidated VIEs Unconsolidated VIEs (1) Maximum Exposure to Loss in Unconsolidated VIEs September 30, 2015: Assets: Cash and cash equivalents $ 18,769 $ — $ — Non-marketable and other securities (2) 204,555 341,065 341,065 Accrued interest receivable and other assets 375 — — Total assets $ 223,699 $ 341,065 $ 341,065 Liabilities: Other liabilities 421 — — Accrued expenses and other liabilities (2) — 65,305 — Total liabilities $ 421 $ 65,305 $ — (1) During the second quarter of 2015 we adopted ASU 2015-02 and certain previously consolidated VIEs are no longer included in our Consolidated Balance Sheet. We applied the accounting guidance as of the beginning of the fiscal year of adoption, January 1, 2015. Upon adoption, we deconsolidated 16 entities, which reduced our total assets and total equity (which includes total SVBFG stockholders' equity plus noncontrolling interests) by $1.1 billion and $1.2 billion , respectively, primarily as a result of the reduction of our non-marketable and other securities and noncontrolling interests, respectively. SVB Financial continues to consolidate its interest in five SVB Capital funds that meet the new consolidated criteria. (2) Included in our non-marketable and other securities portfolio are investments in qualified affordable housing projects of $125.5 million and related unfunded commitments of $65.3 million .

Cash and Cash Equivalents (Tabl

Cash and Cash Equivalents (Tables)	9 Months Ended
	Sep. 30, 2015
Cash and Cash Equivalents [Abstract]
Cash and Cash Equivalents	The following table details our cash and cash equivalents at September 30, 2015 and December 31, 2014 : (Dollars in thousands) September 30, 2015 December 31, 2014 Cash and due from banks (1) $ 1,454,538 $ 1,694,329 Securities purchased under agreements to resell (2) 214,484 95,611 Other short-term investment securities 5,123 6,122 Total cash and cash equivalents $ 1,674,145 $ 1,796,062 (1) At September 30, 2015 and December 31, 2014 , $639 million and $861 million , respectively, of our cash and due from banks was deposited at the Federal Reserve Bank and was earning interest at the Federal Funds target rate, and interest-earning deposits in other financial institutions were $429 million and $440 million , respectively. (2) At September 30, 2015 and December 31, 2014 , securities purchased under agreements to resell were collateralized by U.S. Treasury securities and U.S. agency securities with aggregate fair values of $219 million and $98 million , respectively. None of these securities received as collateral were sold or pledged as of September 30, 2015 or December 31, 2014 .

Investment Securities (Tables)

Investment Securities (Tables)	9 Months Ended
	Sep. 30, 2015
Investments, Debt and Equity Securities [Abstract]
Major Components of Investment Securities Portfolio	The components of our available-for-sale investment securities portfolio at September 30, 2015 and December 31, 2014 are as follows: September 30, 2015 (Dollars in thousands) Amortized Cost Unrealized Gains Unrealized Losses Carrying Value Available-for-sale securities, at fair value: U.S. treasury securities $ 10,103,580 $ 93,458 $ (13 ) $ 10,197,025 U.S. agency debentures 2,902,479 40,502 (13 ) 2,942,968 Residential mortgage-backed securities: Agency-issued collateralized mortgage obligations—fixed rate 1,513,691 10,652 (6,641 ) 1,517,702 Agency-issued collateralized mortgage obligations—variable rate 641,057 4,231 — 645,288 Equity securities 6,426 216 (1,964 ) 4,678 Total available-for-sale securities $ 15,167,233 $ 149,059 $ (8,631 ) $ 15,307,661 December 31, 2014 (Dollars in thousands) Amortized Cost Unrealized Gains Unrealized Losses Carrying Value Available-for-sale securities, at fair value: U.S. treasury securities $ 7,289,135 $ 17,524 $ (4,386 ) $ 7,302,273 U.S. agency debentures 3,540,055 30,478 (8,977 ) $ 3,561,556 Residential mortgage-backed securities: Agency-issued collateralized mortgage obligations—fixed rate 1,884,450 14,851 (14,458 ) 1,884,843 Agency-issued collateralized mortgage obligations—variable rate 779,103 5,372 — 784,475 Equity securities 5,202 2,628 (322 ) 7,508 Total available-for-sale securities $ 13,497,945 $ 70,853 $ (28,143 ) $ 13,540,655
Summary of Unrealized Losses on Available for Sale Securities	The following table summarizes our unrealized losses on our available-for-sale securities portfolio into categories of less than 12 months and 12 months or longer as of September 30, 2015 : September 30, 2015 Less than 12 months 12 months or longer Total (Dollars in thousands) Fair Value of Investments Unrealized Losses Fair Value of Investments Unrealized Losses Fair Value of Investments Unrealized Losses Available-for-sale securities: U.S. treasury securities $ 51,576 $ (13 ) $ — $ — $ 51,576 $ (13 ) U.S. agency debentures 17,424 (13 ) — — 17,424 (13 ) Residential mortgage-backed securities: Agency-issued collateralized mortgage obligations—fixed rate 230,141 (465 ) 396,781 (6,176 ) 626,922 (6,641 ) Equity securities 3,222 (1,964 ) 3,222 (1,964 ) Total temporarily impaired securities: (1) $ 302,363 $ (2,455 ) $ 396,781 $ (6,176 ) $ 699,144 $ (8,631 ) (1) As of September 30, 2015 , we identified a total of 43 investments that were in unrealized loss positions, of which 18 investments totaling $396.8 million with unrealized losses of $6.2 million have been in an impaired position for a period of time greater than 12 months. As of September 30, 2015 , we do not intend to sell any impaired fixed income investment securities prior to recovery of our adjusted cost basis, and it is more likely than not that we will not be required to sell any of our securities prior to recovery of our adjusted cost basis. Based on our analysis as of September 30, 2015 , we deem all impairments to be temporary, and therefore changes in value for our temporarily impaired securities as of the same date are included in other comprehensive income. Market valuations and impairment analyses on assets in the available-for-sale securities portfolio are reviewed and monitored on a quarterly basis. The following table summarizes our unrealized losses on our available-for-sale securities portfolio into categories of less than 12 months and 12 months or longer as of December 31, 2014 : December 31, 2014 Less than 12 months 12 months or longer Total (Dollars in thousands) Fair Value of Investments Unrealized Losses Fair Value of Investments Unrealized Losses Fair Value of Investments Unrealized Losses Available-for-sale securities: U.S. treasury securities $ 2,297,895 $ (4,386 ) $ — $ — $ 2,297,895 $ (4,386 ) U.S. agency debentures 249,266 (489 ) 507,385 (8,488 ) 756,651 (8,977 ) Residential mortgage-backed securities: Agency-issued collateralized mortgage obligations—fixed rate 662,092 (3,104 ) 453,801 (11,354 ) 1,115,893 (14,458 ) Equity securities 568 (322 ) — — 568 (322 ) Total temporarily impaired securities (1): $ 3,209,821 $ (8,301 ) $ 961,186 $ (19,842 ) $ 4,171,007 $ (28,143 ) (1) As of December 31, 2014, we identified a total of 115 investments that were in unrealized loss positions, of which 33 investments totaling $961.2 million with unrealized losses of $19.8 million have been in an impaired position for a period of time greater than 12 months.
Summary of Remaining Contractual Principal Maturities and Fully Taxable Equivalent Yields on Securities	The following table summarizes the remaining contractual principal maturities and fully taxable equivalent yields on fixed income investment securities classified as available-for-sale as of September 30, 2015 . The weighted average yield is computed using the amortized cost of fixed income investment securities, which are reported at fair value. For U.S. treasury securities and U.S. Agency debentures, the expected maturity is the actual contractual maturity of the notes. Expected maturities for mortgage-backed securities may differ significantly from their contractual maturities because mortgage borrowers have the right to prepay outstanding loan obligations with or without penalties. Mortgage-backed securities classified as available-for-sale typically have original contractual maturities from 10 to 30 years whereas expected average lives of these securities tend to be significantly shorter and vary based upon structure and prepayments in lower rate environments. September 30, 2015 Total One Year or Less After One Year to Five Years After Five Years to Ten Years After Ten Years (Dollars in thousands) Carrying Value Weighted- Average Yield Carrying Value Weighted- Average Yield Carrying Value Weighted- Average Yield Carrying Value Weighted- Average Yield Carrying Value Weighted- Average Yield U.S. treasury securities $ 10,197,025 1.16 % $ 953,659 0.45 % $ 8,806,490 1.20 % $ 436,876 1.75 % $ — — % U.S. agency debentures 2,942,968 1.63 821,073 1.73 1,971,243 1.53 150,652 2.49 — — Residential mortgage-backed securities: Agency-issued collateralized mortgage obligations - fixed rate 1,517,702 1.96 — — — — 570,403 2.50 947,299 1.65 Agency-issued collateralized mortgage obligations - variable rate 645,288 0.71 — — — — — — 645,288 0.71 Total $ 15,302,983 1.31 $ 1,774,732 1.04 $ 10,777,733 1.26 $ 1,157,931 2.21 $ 1,592,587 1.27 The following table summarizes the remaining contractual principal maturities and fully taxable equivalent yields on fixed income investment securities classified as held-to-maturity as of September 30, 2015 . Interest income on certain municipal bonds and notes (non-taxable investments) are presented on a fully taxable equivalent basis using the federal statutory tax rate of 35% . The weighted average yield is computed using the amortized cost of fixed income investment securities. For U.S. Agency debentures, the expected maturity is the actual contractual maturity of the notes. Expected maturities for mortgage-backed securities may differ significantly from their contractual maturities because mortgage borrowers have the right to prepay outstanding loan obligations with or without penalties. Mortgage-backed securities classified as held-to-maturity typically have original contractual maturities from 10 to 30 years whereas expected average lives of these securities tend to be significantly shorter and vary based upon structure and prepayments in lower rate environments. September 30, 2015 Total One Year or Less After One Year to Five Years After Five Years to Ten Years After Ten Years (Dollars in thousands) Amortized Cost Weighted- Average Yield Amortized Cost Weighted- Average Yield Amortized Cost Weighted- Average Yield Amortized Cost Weighted- Average Yield Amortized Cost Weighted- Average Yield U.S. agency debentures $ 545,753 2.69 % — % $ — — % $ 545,753 2.69 % $ — — % Residential mortgage-backed securities: Agency-issued mortgage-backed securities 2,457,328 2.43 — — 39,527 2.38 674,584 2.20 1,743,217 2.52 Agency-issued collateralized mortgage obligations - fixed rate 4,045,172 1.70 — — — — — — 4,045,172 1.70 Agency-issued collateralized mortgage obligations - variable rate 109,478 0.65 — — — — — — 109,478 0.65 Agency-issued commercial mortgage-backed securities 1,073,160 2.12 — — — — — — 1,073,160 2.12 Municipal bonds and notes 75,635 6.05 4,711 5.58 29,083 5.95 35,698 6.14 6,143 6.35 Total $ 8,306,526 2.06 $ 4,711 5.58 $ 68,610 3.89 $ 1,256,035 2.53 $ 6,977,170 1.95
Held-to-maturity Securities	The components of our held-to-maturity investment securities portfolio at September 30, 2015 and December 31, 2014 are as follows: September 30, 2015 (Dollars in thousands) Amortized Cost Unrealized Gains Unrealized Losses Fair Value Held-to-maturity securities, at cost: U.S. agency debentures (1) $ 545,753 $ 11,923 $ — $ 557,676 Residential mortgage-backed securities: Agency-issued mortgage-backed securities 2,457,328 18,925 (1,005 ) 2,475,248 Agency-issued collateralized mortgage obligations—fixed rate 4,045,172 24,146 (5,372 ) 4,063,946 Agency-issued collateralized mortgage obligations—variable rate 109,478 577 — 110,055 Agency-issued commercial mortgage-backed securities 1,073,160 12,449 (309 ) 1,085,300 Municipal bonds and notes 75,635 36 (893 ) 74,778 Total held-to-maturity securities $ 8,306,526 $ 68,056 $ (7,579 ) $ 8,367,003 (1) Consists of pools of Small Business Investment Company debentures issued and guaranteed by the U.S. Small Business Administration, an independent agency of the United States. December 31, 2014 (Dollars in thousands) Amortized Unrealized Unrealized Fair Value Held-to-maturity securities, at cost: U.S. agency debentures (1) $ 405,899 $ 4,589 $ (38 ) $ 410,450 Residential mortgage-backed securities: Agency-issued mortgage-backed securities 2,799,923 5,789 (2,320 ) 2,803,392 Agency-issued collateralized mortgage obligations—fixed rate 3,185,109 4,521 (14,885 ) 3,174,745 Agency-issued collateralized mortgage obligations—variable rate 131,580 371 — 131,951 Agency-issued commercial mortgage-backed securities 814,589 1,026 (3,800 ) 811,815 Municipal bonds and notes 83,942 18 (657 ) 83,303 Total held-to-maturity securities $ 7,421,042 $ 16,314 $ (21,700 ) $ 7,415,656 (1) Consists of pools of Small Business Investment Company debentures issued and guaranteed by the U.S. Small Business Administration, an independent agency of the United States. The following table summarizes our unrealized losses on our held-to-maturity securities portfolio into categories of less than 12 months and 12 months or longer as of September 30, 2015 : September 30, 2015 Less than 12 months 12 months or longer Total (Dollars in thousands) Fair Value of Investments Unrealized Losses Fair Value of Investments Unrealized Losses Fair Value of Investments Unrealized Losses Held-to-maturity securities: Residential mortgage-backed securities: Agency-issued mortgage-backed securities $ 308,687 $ (438 ) $ 23,732 $ (567 ) $ 332,419 $ (1,005 ) Agency-issued collateralized mortgage obligations—fixed rate 705,362 (5,264 ) 8,945 (108 ) 714,307 (5,372 ) Agency-issued commercial mortgage-backed securities — — 42,179 (309 ) 42,179 (309 ) Municipal bonds and notes 29,712 (235 ) 32,706 (658 ) 62,418 (893 ) Total temporarily impaired securities (1): $ 1,043,761 $ (5,937 ) $ 107,562 $ (1,642 ) $ 1,151,323 $ (7,579 ) (1) As of September 30, 2015 , we identified a total of 157 investments that were in unrealized loss positions, 63 of which have been in an impaired position for a period of time greater than 12 months. As of September 30, 2015 , we do not intend to sell any impaired fixed income investment securities prior to recovery of our adjusted cost basis, and it is more likely than not that we will not be required to sell any of our securities prior to recovery of our adjusted cost basis, which is consistent with our classification of these securities. Based on our analysis as of September 30, 2015 , we deem all impairments to be temporary. Market valuations and impairment analyses on assets in the held-to-maturity securities portfolio are reviewed and monitored on a quarterly basis. The following table summarizes our unrealized losses on our held-to-maturity securities portfolio into categories of less than 12 months and 12 months or longer as of December 31, 2014 : December 31, 2014 Less than 12 months 12 months or longer (1) Total (Dollars in thousands) Fair Value of Unrealized Fair Value of Unrealized Fair Value of Unrealized Held-to-maturity securities: U.S. agency debentures $ 48,335 $ (38 ) $ — $ — $ 48,335 $ (38 ) Residential mortgage-backed securities: Agency-issued mortgage-backed securities 999,230 (2,320 ) — — 999,230 (2,320 ) Agency-issued collateralized mortgage obligations—fixed rate 1,682,348 (9,705 ) 783,558 (5,180 ) 2,465,906 (14,885 ) Agency-issued commercial mortgage-backed securities 629,840 (3,800 ) — — 629,840 (3,800 ) Municipal bonds and notes 79,141 (657 ) — — 79,141 (657 ) Total temporarily impaired securities (2): $ 3,438,894 $ (16,520 ) $ 783,558 $ (5,180 ) $ 4,222,452 $ (21,700 ) (1) Represents securities in an unrealized loss position for twelve months or longer in which the amortized cost basis was re-set for those securities re-designated from AFS to HTM effective June 1, 2014. (2) As of December 31, 2014, we identified a total of 292 investments that were in unrealized loss positions, of which 26 investments totaling $783.6 million with unrealized losses of $5.2 million have been in an impaired position for a period of time greater than 12 months.
Schedule of Nonmarketable and Other Securities	The components of our non-marketable and other investment securities portfolio at September 30, 2015 and December 31, 2014 are as follows: (Dollars in thousands) September 30, 2015 December 31, 2014 Non-marketable and other securities (1): Non-marketable securities (fair value accounting): Venture capital and private equity fund investments (2) $ 154,660 $ 1,130,882 Other venture capital investments (3) 3,390 71,204 Other securities (fair value accounting) (4) 779 108,251 Non-marketable securities (equity method accounting) (5): Venture capital and private equity fund investments 84,197 — Debt funds 21,217 26,672 Other investments 119,731 116,002 Non-marketable securities (cost method accounting): Venture capital and private equity fund investments (6) 123,550 140,551 Other investments (7) 17,499 13,423 Investments in qualified affordable housing projects, net (7) 125,532 121,155 Total non-marketable and other securities $ 650,555 $ 1,728,140 (1) During the second quarter of 2015 we adopted new accounting guidance related to our consolidated variable interest entities (ASU 2015-02) under a modified retrospective approach. Periods prior to January 1, 2015 have not been revised. See Note 1— "Basis of Presentation” and Note 4— "Variable Interest Entities" of the “Notes to Interim Consolidated Financial Statements (unaudited)” under Part I, Item 1 of this report for additional details regarding our non-marketable and other securities. (2) The following table shows the amounts of venture capital and private equity fund investments held by the following funds and our ownership percentage of each fund at September 30, 2015 and December 31, 2014 (fair value accounting): September 30, 2015 December 31, 2014 (Dollars in thousands) Amount Ownership % Amount Ownership % SVB Strategic Investors Fund, LP $ 23,229 12.6 % $ 24,645 12.6 % SVB Strategic Investors Fund II, LP (i) — — 97,250 8.6 SVB Strategic Investors Fund III, LP (i) — — 269,821 5.9 SVB Strategic Investors Fund IV, LP (i) — — 291,291 5.0 Strategic Investors Fund V Funds (i) — — 226,111 Various Strategic Investors Fund VI Funds (i) — — 89,605 — SVB Capital Preferred Return Fund, LP 61,869 20.0 62,110 20.0 SVB Capital—NT Growth Partners, LP 62,818 33.0 61,973 33.0 SVB Capital Partners II, LP (i) — — 302 5.1 Other private equity fund (ii) 6,744 58.2 7,774 58.2 Total venture capital and private equity fund investments $ 154,660 $ 1,130,882 (i) Funds were deconsolidated during the second quarter of 2015 upon adoption of ASU 2015-02 and are now reported under equity method accounting. Periods prior to January 1, 2015 have not been revised. See Note 1— "Basis of Presentation” of the “Notes to Interim Consolidated Financial Statements (unaudited)” under Part I, Item 1 of this report for additional details. (ii) At September 30, 2015 , we had a direct ownership interest of 41.5 percent in other private equity funds and an indirect ownership interest of 12.6 percent through our ownership interest of SVB Capital—NT Growth Partners, LP and an indirect ownership interest of 4.1 percent through our ownership interest of SVB Capital Preferred Return Fund, LP. (3) The following table shows the amounts of other venture capital investments held by the following funds and our ownership percentage of each fund at September 30, 2015 and December 31, 2014 (fair value accounting): September 30, 2015 December 31, 2014 (Dollars in thousands) Amount Ownership % Amount Ownership % Silicon Valley BancVentures, LP $ 3,390 10.7 % $ 3,291 10.7 % SVB Capital Partners II, LP (i) — — 20,481 5.1 Capital Partners III, LP (i) — — 41,055 — SVB Capital Shanghai Yangpu Venture Capital Fund (i) — — 6,377 6.8 Total other venture capital investments $ 3,390 $ 71,204 (i) Funds were deconsolidated during the second quarter of 2015 upon adoption of ASU 2015-02 and are now reported under equity method accounting, within "Other venture capital and private equity fund investments". Periods prior to January 1, 2015 have not been revised. See Note 1— "Basis of Presentation” of the “Notes to Interim Consolidated Financial Statements (unaudited)” under Part I, Item 1 of this report for additional details. (4) Investments classified as other securities (fair value accounting) represent direct equity investments in public companies held by our consolidated funds. At December 31, 2014 , the amount primarily included total unrealized gains in one public company, FireEye, Inc. ("FireEye") that were realized during the first quarter of 2015. Funds were deconsolidated during the second quarter of 2015 upon adoption of ASU 2015-02. See Note 1— "Basis of Presentation” of the “Notes to Interim Consolidated Financial Statements (unaudited)” under Part I, Item 1 of this report for additional details. (5) The following table shows the carrying value and our ownership percentage of each investment at September 30, 2015 and December 31, 2014 (equity method accounting): September 30, 2015 December 31, 2014 (Dollars in thousands) Amount Ownership % Amount Ownership % Venture capital and private equity fund investments: SVB Strategic Investors Fund II, LP (i) $ 11,204 8.6 % $ — — % SVB Strategic Investors Fund III, LP (i) 24,781 5.9 — — SVB Strategic Investors Fund IV, LP (i) 25,542 5.0 — — Other venture capital and private equity fund investments (i) 22,670 Various — — Total venture capital and private equity fund investments 84,197 — Debt funds: Gold Hill Capital 2008, LP (ii) $ 17,662 15.5 $ 21,294 15.5 Other debt funds 3,555 Various 5,378 Various Total debt funds 21,217 26,672 Other investments: China Joint Venture investment 79,299 50.0 79,569 50.0 Other investments 40,432 Various 36,433 Various Total other investments $ 119,731 $ 116,002 (i) Represents funds previously consolidated and reported under fair value accounting in (2) above prior to adoption of ASU 2015-02 during the second quarter of 2015. Periods prior to January 1, 2015 have not been revised. See Note 1— "Basis of Presentation” of the “Notes to Interim Consolidated Financial Statements (unaudited)” under Part I, Item 1 of this report for additional details. (ii) At September 30, 2015 , we had a direct ownership interest of 11.5 percent in the fund and an indirect interest in the fund through our investment in Gold Hill Capital 2008, LLC of 4.0 percent . (6) Represents investments in 270 and 281 funds (primarily venture capital funds) at September 30, 2015 and December 31, 2014 , respectively, where our ownership interest is typically less than 5% of the voting interests of each such fund and in which we do not have the ability to exercise significant influence over the partnerships operating activities and financial policies. The carrying value, and estimated fair value, of these venture capital and private equity fund investments (cost method accounting) was $124 million and $244 million , respectively, as of September 30, 2015 . The carrying value, and estimated fair value, of these venture capital and private equity fund investments (cost method accounting) was $141 million and $234 million , respectively, as of December 31, 2014 . (7) 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 1— "Basis of Presentation" of the "Notes to Interim Consolidated Financial Statements" under Part I, Item 1 in this report.
Schedule Of Investments In Qualified Affordable Housing Projects And Related Unfunded Commitments	The following table presents the balances of our investments in qualified affordable housing projects and related unfunded commitments at September 30, 2015 and December 31, 2014 : (Dollars in thousands) September 30, 2015 December 31, 2014 Investments in qualified affordable housing projects, net $ 125,532 $ 121,155 Accrued expenses and other liabilities 65,305 65,921 The following table presents other information relating to our investments in qualified affordable housing projects for the three and nine months ended September 30, 2015 and 2014 : Three months ended September 30, Nine months ended September 30, (Dollars in thousands) 2015 2014 2015 2014 Tax credits and other tax benefits recognized $ 4,780 $ 3,087 $ 11,207 $ 9,312 Amortization expense included in provision for income taxes (i) 2,011 1,246 7,549 5,971 (i) All investments are amortized using the proportional amortization method and are included in provision for income taxes.
Components of Gains and Losses (Realized and Unrealized) on Investment Securities	The following table presents the components of gains and losses (realized and unrealized) on investment securities for the three and nine months ended September 30, 2015 and 2014 : Three months ended September 30, Nine months ended September 30, (Dollars in thousands) 2015 2014 2015 2014 Gross gains on investment securities: Available-for-sale securities, at fair value (1) $ 46 $ 45 $ 2,971 $ 642 Non-marketable securities (fair value accounting): Venture capital and private equity fund investments 6,746 69,044 24,767 268,483 Other venture capital investments 15 6,779 198 11,334 Other securities (fair value accounting) 40 5,444 9,108 136,010 Non-marketable securities (equity method accounting): Venture capital and private equity fund investments 7,655 275 22,111 1,284 Debt funds 379 1,037 2,067 4,076 Other investments 1,282 927 2,147 3,635 Non-marketable securities (cost method accounting): Venture capital and private equity fund investments 5,624 2,641 21,101 7,706 Other investments — 19 576 5,174 Total gross gains on investment securities 21,787 86,211 85,046 438,344 Gross losses on investment securities: Available-for-sale securities, at fair value (1) (33 ) (1,035 ) (221 ) (18,052 ) Non-marketable securities (fair value accounting): Venture capital and private equity fund investments (1,148 ) (25,584 ) (2,695 ) (76,243 ) Other venture capital investments — (1,233 ) (52 ) (3,274 ) Other securities (fair value accounting) (325 ) (52,264 ) (1,117 ) (166,051 ) Non-marketable securities (equity method accounting): Venture capital and private equity fund investments (914 ) (115 ) (1,351 ) (231 ) Debt funds (1 ) (64 ) (589 ) (457 ) Other investments (460 ) — (1,470 ) (759 ) Non-marketable securities (cost method accounting): Venture capital and private equity fund investments (2) (132 ) (272 ) (530 ) (781 ) Other investments (6 ) — (15 ) (260 ) Total gross losses on investment securities (3,019 ) (80,567 ) (8,040 ) (266,108 ) Gains on investment securities, net $ 18,768 $ 5,644 $ 77,006 $ 172,236 (1) Includes realized gains (losses) on sales of available-for-sale equity securities that are recognized in the income statement. Unrealized gains (losses) on available-for-sale fixed income and equity securities are recognized in other comprehensive income. The cost basis of available-for-sale securities sold is determined on a specific identification basis. (2) For the three months ended September 30, 2015 and 2014 , includes OTTI losses of $0.1 million from the declines in value for 4 of the 270 investments and $0.3 million from the declines in value for 5 of the 281 investments, respectively. For the nine months ended September 30, 2015 and 2014, includes OTTI losses of $0.4 million from the declines in value for 19 of the 270 investments and $0.7 million from the declines in value for 22 of the 281 investments, respectively. We concluded that any declines in value for the remaining investments were temporary, and as such, no OTTI was required to be recognized.

Loans and Allowance for Loan 32

Loans and Allowance for Loan Losses (Tables)	9 Months Ended
	Sep. 30, 2015
Receivables [Abstract]
Loans and Allowance for Loan Losses	The composition of loans, net of unearned income of $115 million and $104 million at September 30, 2015 and December 31, 2014 , respectively, is presented in the following table: (Dollars in thousands) September 30, 2015 December 31, 2014 Commercial loans: Software and internet $ 5,272,825 $ 4,954,676 Hardware 962,295 1,131,006 Private equity/venture capital 4,571,102 4,582,906 Life science & healthcare 1,598,362 1,289,904 Premium wine 193,712 187,568 Other 295,550 234,551 Total commercial loans 12,893,846 12,380,611 Real estate secured loans: Premium wine (1) 633,248 606,753 Consumer loans (2) 1,444,067 1,118,115 Other 38,043 39,651 Total real estate secured loans 2,115,358 1,764,519 Construction loans 92,551 78,626 Consumer loans 212,825 160,520 Total loans, net of unearned income (3) $ 15,314,580 $ 14,384,276 (1) Included in our premium wine portfolio are gross construction loans of $119 million and $112 million at September 30, 2015 and December 31, 2014 , respectively. (2) Consumer loans secured by real estate at September 30, 2015 and December 31, 2014 were comprised of the following: (Dollars in thousands) September 30, 2015 December 31, 2014 Loans for personal residence $ 1,225,794 $ 918,629 Loans to eligible employees 149,612 133,568 Home equity lines of credit 68,661 65,918 Consumer loans secured by real estate $ 1,444,067 $ 1,118,115 (3) Included within our total loan portfolio are credit card loans of $186 million and $131 million at September 30, 2015 and December 31, 2014 , respectively.
Composition of Loans, Net of Unearned Income, Broken Out by Portfolio Segment and Class of Financing Receivable	The composition of loans, net of unearned income of $115 million and $104 million at September 30, 2015 and December 31, 2014 , respectively, broken out by portfolio segment and class of financing receivable, is as follows: (Dollars in thousands) September 30, 2015 December 31, 2014 Commercial loans: Software and internet $ 5,272,825 $ 4,954,676 Hardware 962,295 1,131,006 Private equity/venture capital 4,571,102 4,582,906 Life science & healthcare 1,598,362 1,289,904 Premium wine 826,960 794,321 Other 426,144 352,828 Total commercial loans 13,657,688 13,105,641 Consumer loans: Real estate secured loans 1,444,067 1,118,115 Other consumer loans 212,825 160,520 Total consumer loans 1,656,892 1,278,635 Total loans, net of unearned income $ 15,314,580 $ 14,384,276
Aging of Gross Loans, Broken out by Portfolio Segment and Class of Financing Receivable	The following table summarizes the aging of our gross loans, broken out by portfolio segment and class of financing receivable as of September 30, 2015 and December 31, 2014 : (Dollars in thousands) 30 - 59 Days Past Due 60 - 89 Days Past Due Greater Than 90 Days Past Due Total Past Due Current Loans Past Due 90 Days or More Still Accruing Interest September 30, 2015: Commercial loans: Software and internet $ 9,729 $ 1,168 $ 169 $ 11,066 $ 5,244,198 $ 169 Hardware 620 1,021 — 1,641 965,511 — Private equity/venture capital 410 — — 410 4,611,543 — Life science & healthcare 377 729 — 1,106 1,566,185 — Premium wine 295 — — 295 827,709 — Other — 8 — 8 429,145 — Total commercial loans 11,431 2,926 169 14,526 13,644,291 169 Consumer loans: Real estate secured loans — — — — 1,443,011 — Other consumer loans 1,313 — — 1,313 211,339 — Total consumer loans 1,313 — — 1,313 1,654,350 — Total gross loans excluding impaired loans 12,744 2,926 169 15,839 15,298,641 169 Impaired loans — 1,798 8,295 10,093 105,368 — Total gross loans $ 12,744 $ 4,724 $ 8,464 $ 25,932 $ 15,404,009 $ 169 December 31, 2014: Commercial loans: Software and internet $ 10,989 $ 1,627 $ 52 $ 12,668 $ 4,950,291 $ 52 Hardware 13,424 126 — 13,550 1,124,423 — Private equity/venture capital 40,773 — — 40,773 4,580,526 — Life science & healthcare 738 786 — 1,524 1,298,728 — Premium wine — — — — 795,345 — Other 178 3 — 181 354,939 — Total commercial loans 66,102 2,542 52 68,696 13,104,252 52 Consumer loans: Real estate secured loans 1,592 341 1,250 3,183 1,114,286 1,250 Other consumer loans — — — — 160,212 — Total consumer loans 1,592 341 1,250 3,183 1,274,498 1,250 Total gross loans excluding impaired loans 67,694 2,883 1,302 71,879 14,378,750 1,302 Impaired loans 598 1,293 22,320 24,211 13,926 — Total gross loans $ 68,292 $ 4,176 $ 23,622 $ 96,090 $ 14,392,676 $ 1,302
Impaired Loans and Allowance for Loan Losses, Broken out by Portfolio Segment and Class of Financing Receivable	The following table summarizes our impaired loans as they relate to our allowance for loan losses, broken out by portfolio segment and class of financing receivable as of September 30, 2015 and December 31, 2014 : (Dollars in thousands) Impaired loans for which there is a related allowance for loan losses Impaired loans for which there is no related allowance for loan losses Total carrying value of impaired loans Total unpaid principal of impaired loans September 30, 2015: Commercial loans: Software and internet $ 64,792 $ — $ 64,792 $ 89,471 Hardware 3,586 177 3,763 3,802 Private equity/venture capital — — — — Life science & healthcare 45,389 — 45,389 45,904 Premium wine — 1,201 1,201 1,716 Other 157 — 157 157 Total commercial loans 113,924 1,378 115,302 141,050 Consumer loans: Real estate secured loans — 159 159 1,399 Other consumer loans — — — — Total consumer loans — 159 159 1,399 Total $ 113,924 $ 1,537 $ 115,461 $ 142,449 December 31, 2014: Commercial loans: Software and internet $ 33,287 $ — $ 33,287 $ 34,218 Hardware 1,403 1,118 2,521 2,535 Private equity/venture capital — — — — Life science & healthcare 475 — 475 2,453 Premium wine — 1,304 1,304 1,743 Other 233 — 233 233 Total commercial loans 35,398 2,422 37,820 41,182 Consumer loans: Real estate secured loans — 192 192 1,412 Other consumer loans 125 — 125 305 Total consumer loans 125 192 317 1,717 Total $ 35,523 $ 2,614 $ 38,137 $ 42,899
Average Impaired Loans, Broken out by Portfolio Segment and Class of Financing Receivable	The following table summarizes our average impaired loans, broken out by portfolio segment and class of financing receivable for the three and nine months ended September 30, 2015 and 2014 : Three months ended September 30, Nine months ended September 30, (Dollars in thousands) 2015 2014 2015 2014 Average impaired loans: Commercial loans: Software and internet $ 77,156 $ 10,651 $ 54,543 $ 13,690 Hardware 2,796 1,540 1,944 8,140 Life science & healthcare 17,184 333 6,526 636 Premium wine 1,213 1,364 1,245 1,398 Other 3,132 674 3,498 1,383 Total commercial loans 101,481 14,562 67,756 25,247 Consumer loans: Real estate secured loans 162 212 180 224 Other consumer loans — 261 55 375 Total consumer loans 162 473 235 599 Total average impaired loans $ 101,643 $ 15,035 $ 67,991 $ 25,846
Activity in Allowance for Loan Losses Broken out by Portfolio Segment	The following tables summarize the activity relating to our allowance for loan losses for the three and nine months ended September 30, 2015 and 2014 , broken out by portfolio segment: Three months ended September 30, 2015 (dollars in thousands) Beginning Balance June 30, 2015 Charge-offs Recoveries Provision for (Reduction of) Loan Losses Ending Balance September 30, 2015 Commercial loans: Software and internet $ 106,728 $ (24,815 ) $ 195 $ 5,958 $ 88,066 Hardware 20,472 — 240 (70 ) 20,642 Private equity/venture capital 29,276 — — 3,166 32,442 Life science & healthcare 17,233 (117 ) 50 19,793 36,959 Premium wine 4,409 — — 253 4,662 Other 5,894 (4,186 ) 89 2,976 4,773 Total commercial loans 184,012 (29,118 ) 574 32,076 187,544 Consumer loans 8,632 — 4 1,327 9,963 Total allowance for loan losses $ 192,644 $ (29,118 ) $ 578 $ 33,403 $ 197,507 Three months ended September 30, 2014 (dollars in thousands) Beginning Balance June 30, 2014 Charge-offs Recoveries Provision for (Reduction of) Loan Losses Ending Balance September 30, 2014 Commercial loans: Software and internet $ 53,239 $ (6,907 ) $ 790 $ 11,078 $ 58,200 Hardware 24,780 (2,643 ) 113 2,491 24,741 Private equity/venture capital 19,004 — — 845 19,849 Life science & healthcare 10,597 — 53 1,591 12,241 Premium wine 3,546 (35 ) — 710 4,221 Other 3,218 (1,072 ) 1,306 (530 ) 2,922 Total commercial loans 114,384 (10,657 ) 2,262 16,185 122,174 Consumer loans 6,344 — 118 425 6,887 Total allowance for loan losses $ 120,728 $ (10,657 ) $ 2,380 $ 16,610 $ 129,061 Nine months ended September 30, 2015 (dollars in thousands) Beginning Balance December 31, 2014 Charge-offs Recoveries Provision for Ending Balance September 30, 2015 Commercial loans: Software and internet $ 80,981 $ (26,980 ) $ 1,239 $ 32,826 $ 88,066 Hardware 25,860 (4,049 ) 3,049 (4,218 ) 20,642 Private equity/venture capital 27,997 — — 4,445 32,442 Life science & healthcare 15,208 (3,336 ) 129 24,958 36,959 Premium wine 4,473 — 7 182 4,662 Other 3,253 (4,974 ) 559 5,935 4,773 Total commercial loans 157,772 (39,339 ) 4,983 64,128 187,544 Consumer loans 7,587 — 136 2,240 9,963 Total allowance for loan losses $ 165,359 $ (39,339 ) $ 5,119 $ 66,368 $ 197,507 Nine months ended September 30, 2014 (dollars in thousands) Beginning Balance December 31, 2013 Charge-offs Recoveries Provision for (Reduction of) Loan Losses Ending Balance September 30, 2014 Commercial loans: Software and internet $ 64,084 $ (18,932 ) $ 1,023 $ 12,025 $ 58,200 Hardware 36,553 (15,230 ) 2,070 1,348 24,741 Private equity/venture capital 16,385 — — 3,464 19,849 Life science & healthcare 11,926 (930 ) 341 904 12,241 Premium wine 3,914 (35 ) 238 104 4,221 Other 3,680 (3,062 ) 1,316 988 2,922 Total commercial loans 136,542 (38,189 ) 4,988 18,833 122,174 Consumer loans 6,344 — 325 218 6,887 Total allowance for loan losses $ 142,886 $ (38,189 ) $ 5,313 $ 19,051 $ 129,061
Allowance for Loan Losses Individually and Collectively Evaluated for Impairment	The following table summarizes the allowance for loan losses individually and collectively evaluated for impairment as of September 30, 2015 and December 31, 2014 , broken out by portfolio segment: September 30, 2015 December 31, 2014 Individually Evaluated for Impairment Collectively Evaluated for Impairment Individually Evaluated for Impairment Collectively Evaluated for Impairment (Dollars in thousands) Allowance for loan losses Recorded investment in loans Allowance for loan losses Recorded investment in loans Allowance for loan losses Recorded investment in loans Allowance for loan losses Recorded investment in loans Commercial loans: Software and internet $ 25,260 $ 64,792 $ 62,806 $ 5,208,033 $ 13,695 $ 33,287 $ 67,286 $ 4,921,389 Hardware 1,100 3,763 19,542 958,532 1,133 2,521 24,727 1,128,485 Private equity/venture capital — — 32,442 4,571,102 — — 27,997 4,582,906 Life science & healthcare 19,739 45,389 17,220 1,552,973 121 475 15,087 1,289,429 Premium wine — 1,201 4,662 825,759 — 1,304 4,473 793,017 Other 157 157 4,616 425,987 71 233 3,182 352,595 Total commercial loans 46,256 115,302 141,288 13,542,386 15,020 37,820 142,752 13,067,821 Consumer loans — 159 9,963 1,656,733 31 317 7,556 1,278,318 Total $ 46,256 $ 115,461 $ 151,251 $ 15,199,119 $ 15,051 $ 38,137 $ 150,308 $ 14,346,139
Credit Quality Indicators, Broken out by Portfolio Segment and Class of Financing Receivables	The following table summarizes the credit quality indicators, broken out by portfolio segment and class of financing receivables as of September 30, 2015 and December 31, 2014 : (Dollars in thousands) Pass Performing (Criticized) Impaired Total September 30, 2015: Commercial loans: Software and internet $ 4,802,522 $ 452,742 $ 64,792 $ 5,320,056 Hardware 834,067 133,085 3,763 970,915 Private equity/venture capital 4,611,953 — — 4,611,953 Life science & healthcare 1,446,972 120,319 45,389 1,612,680 Premium wine 804,411 23,593 1,201 829,205 Other 417,459 11,694 157 429,310 Total commercial loans 12,917,384 741,433 115,302 13,774,119 Consumer loans: Real estate secured loans 1,433,926 9,085 159 1,443,170 Other consumer loans 211,366 1,286 — 212,652 Total consumer loans 1,645,292 10,371 159 1,655,822 Total gross loans $ 14,562,676 $ 751,804 $ 115,461 $ 15,429,941 December 31, 2014: Commercial loans: Software and internet $ 4,611,253 $ 351,706 $ 33,287 $ 4,996,246 Hardware 945,998 191,975 2,521 1,140,494 Private equity/venture capital 4,615,231 6,068 — 4,621,299 Life science & healthcare 1,165,266 134,986 475 1,300,727 Premium wine 774,962 20,383 1,304 796,649 Other 346,153 8,967 233 355,353 Total commercial loans 12,458,863 714,085 37,820 13,210,768 Consumer loans: Real estate secured loans 1,112,396 5,073 192 1,117,661 Other consumer loans 158,162 2,050 125 160,337 Total consumer loans 1,270,558 7,123 317 1,277,998 Total gross loans $ 13,729,421 $ 721,208 $ 38,137 $ 14,488,766
Summary of Loans Modified in Troubled Debt Restructurings ("TDRs") by Portfolio Segment and Class of Financing Receivables	The following table summarizes our loans modified in TDRs, broken out by portfolio segment and class of financing receivables at September 30, 2015 and December 31, 2014 : (Dollars in thousands) September 30, 2015 December 31, 2014 Loans modified in TDRs: Commercial loans: Software and internet $ 57,766 $ 3,784 Hardware 2,301 1,118 Life science & healthcare 29,529 — Premium wine 1,202 1,891 Other 518 233 Total commercial loans 91,316 7,026 Consumer loans: Other consumer loans — 125 Total consumer loans — 125 Total $ 91,316 $ 7,151
Recorded Investment in Loans Modified in TDRs	The following table summarizes the recorded investment in loans modified in TDRs, broken out by portfolio segment and class of financing receivable, for modifications made during the three and nine months ended September 30, 2015 and 2014 : Three months ended September 30, Nine months ended September 30, (Dollars in thousands) 2015 2014 2015 2014 Loans modified in TDRs during the period: Commercial loans: Software and internet (1) $ 51,749 $ 496 $ 57,766 $ 7,848 Hardware — — 2,031 — Life science & healthcare 29,530 — 29,530 — Premium wine — — — 614 Other 518 — 518 — Total loans modified in TDRs during the period (1) $ 81,797 $ 496 $ 89,845 $ 8,462 (1) There were partial charge-offs of two loans classified as TDRs in our software and internet loan portfolio for $22.4 million during the three and nine months ended September 30, 2015 and no partial charge-offs during the three and nine months ended September 30, 2014.
Recorded Investment in Loans Modified in TDRs within Previous 12 months Subsequently Defaulted	The following table summarizes the recorded investment in loans modified in TDRs within the previous 12 months that subsequently defaulted during the three and nine months ended September 30, 2015 . There were no loans modified in TDRs within the previous 12 months that subsequently defaulted during the three and nine months ended September 30, 2014. Three months ended September 30, Nine months ended September 30, (Dollars in thousands) 2015 2015 TDRs modified within the previous 12 months that defaulted during the period: Commercial loans: Software and internet $ 11,107 $ 17,124 Hardware 2,031 2,031 Life science & healthcare 958 958 Total TDRs modified within the previous 12 months that defaulted in the period $ 14,096 $ 20,113

Short-Term Borrowings and Lon33

Short-Term Borrowings and Long-Term Debt (Tables)	9 Months Ended
	Sep. 30, 2015
Debt Disclosure [Abstract]
Outstanding Short Term Borrowings and Long Term Debt	The following table represents outstanding short-term borrowings and long-term debt at September 30, 2015 and December 31, 2014 : Carrying Value (Dollars in thousands) Maturity Principal value at September 30, 2015 September 30, December 31, Short-term borrowings: Other short-term borrowings (1) $ 3,756 $ 7,781 Total short-term borrowings $ 3,756 $ 7,781 Long-term debt: 3.50% Senior Notes January 29, 2025 $ 350,000 $ 346,591 $ — 5.375% Senior Notes September 15, 2020 350,000 346,878 346,477 6.05% Subordinated Notes (2) June 1, 2017 45,964 49,028 50,040 7.0% Junior Subordinated Debentures October 15, 2033 50,000 54,714 54,845 Total long-term debt $ 797,211 $ 451,362 (1) Represents cash collateral received from certain counterparties in relation to market value exposures of derivative contracts in our favor. (2) At September 30, 2015 and December 31, 2014 , included in the carrying value of our 6.05% Subordinated Notes was an interest rate swap valued at $3.5 million and $ 4.6 million , respectively, related to hedge accounting associated with the notes

Derivative Financial Instrume34

Derivative Financial Instruments (Tables)	9 Months Ended
	Sep. 30, 2015
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Total Notional or Contractual Amounts, Fair Value, Collateral and Net Exposure of Derivative Financial Instruments	The total notional or contractual amounts, fair value, collateral and net exposure of our derivative financial instruments at September 30, 2015 and December 31, 2014 were as follows: September 30, 2015 December 31, 2014 (Dollars in thousands) Balance Sheet Location Notional or Contractual Amount Fair Value Collateral (1) Net Exposure (2) Notional or Contractual Amount Fair Value Collateral (1) Net Exposure (2) Derivatives designated as hedging instruments: Interest rate risks: Interest rate swaps Other assets $ 45,964 $ 3,485 $ — $ 3,485 $ 45,964 $ 4,609 $ 2,970 $ 1,639 Derivatives not designated as hedging instruments: Currency exchange risks: Foreign exchange forwards Other assets 17,038 594 — 594 200,957 5,050 2,441 2,609 Foreign exchange forwards Other liabilities 37,609 (1,075 ) — (1,075 ) 6,226 (489 ) — (489 ) Net exposure (481 ) — (481 ) 4,561 2,441 2,120 Other derivative instruments: Equity warrant assets Other assets 208,270 130,091 — 130,091 197,878 116,604 — 116,604 Other derivatives: Client foreign exchange forwards Other assets 733,204 32,431 3,756 28,675 801,487 28,954 2,370 26,584 Client foreign exchange forwards Other liabilities 695,403 (27,618 ) — (27,618 ) 774,355 (27,647 ) — (27,647 ) Client foreign currency options Other assets 28,390 246 — 246 34,926 227 — 227 Client foreign currency options Other liabilities 28,390 (246 ) — (246 ) 34,926 (227 ) — (227 ) Client interest rate derivatives Other assets 459,614 5,164 — 5,164 387,410 2,546 — 2,546 Client interest rate derivatives Other liabilities 459,614 (5,719 ) — (5,719 ) 387,410 (2,748 ) — (2,748 ) Net exposure 4,258 3,756 502 1,105 2,370 (1,265 ) Net $ 137,353 $ 3,756 $ 133,597 $ 126,879 $ 7,781 $ 119,098 (1) Cash collateral received from our counterparties in relation to market value exposures of derivative contracts in our favor is recorded as a component of “short-term borrowings” on our consolidated balance sheets. (2) Net exposure for contracts in a gain position reflects the replacement cost in the event of nonperformance by all such counterparties. The credit ratings of our institutional counterparties as of September 30, 2015 remain at investment grade or higher and there were no material changes in their credit ratings during the three and nine months ended September 30, 2015 .
Summary of Derivative Activity and Related Impact on Consolidated Statements of Income	A summary of our derivative activity and the related impact on our consolidated statements of income for the three and nine months ended September 30, 2015 and 2014 is as follows: Three months ended September 30, Nine months ended September 30, (Dollars in thousands) Statement of income location 2015 2014 2015 2014 Derivatives designated as hedging instruments: Interest rate risks: Net cash benefit associated with interest rate swaps Interest expense—borrowings $ 631 $ 638 $ 1,903 $ 1,915 Changes in fair value of interest rate swaps Net gains on derivative instruments (8 ) (12 ) (22 ) (37 ) Net gains associated with interest rate risk derivatives $ 623 $ 626 $ 1,881 $ 1,878 Derivatives not designated as hedging instruments: Currency exchange risks: Gains (losses) on revaluations of foreign currency instruments Other noninterest income $ 186 $ (12,640 ) $ (11,667 ) $ (12,347 ) (Losses) gains on internal foreign exchange forward contracts, net Net gains on derivative instruments (218 ) 12,529 11,626 12,038 Net losses associated with currency risk $ (32 ) $ (111 ) $ (41 ) $ (309 ) Other derivative instruments: Net gains on equity warrant assets Net gains on derivative instruments $ 10,685 $ 13,157 $ 54,579 $ 50,859 Gains on client foreign exchange forward contracts, net Net gains on derivative instruments $ 179 $ 886 $ 459 $ 1,358 Net losses on other derivatives (1) Net gains on derivative instruments $ (394 ) $ (22 ) $ (352 ) $ (738 ) (1) Primarily represents the change in fair value of loan conversion options.
Offsetting Assets	The following table summarizes our assets subject to enforceable master netting arrangements as of September 30, 2015 and December 31, 2014 : Gross Amounts Not Offset in the Statement of Financial Position But Subject to Master Netting Arrangements (Dollars in thousands) Gross Amounts of Recognized Assets Gross Amounts offset in the Statement of Financial Position Net Amounts of Assets Presented in the Statement of Financial Position Financial Instruments Cash Collateral Received Net Amount September 30, 2015 Derivative Assets: Interest rate swaps $ 3,485 $ — $ 3,485 $ (3,485 ) $ — $ — Foreign exchange forwards 33,025 — 33,025 (19,373 ) (3,756 ) 9,896 Foreign currency options 322 (76 ) 246 (152 ) — 94 Client interest rate derivatives 5,164 — 5,164 (5,164 ) — — Total derivative assets: 41,996 (76 ) 41,920 (28,174 ) (3,756 ) 9,990 Reverse repurchase, securities borrowing, and similar arrangements 214,484 — 214,484 (214,484 ) — — Total $ 256,480 $ (76 ) $ 256,404 $ (242,658 ) $ (3,756 ) $ 9,990 December 31, 2014 Derivative Assets: Interest rate swaps $ 4,609 $ — $ 4,609 $ (1,639 ) $ (2,970 ) $ — Foreign exchange forwards 34,004 — 34,004 (17,843 ) (4,811 ) 11,350 Foreign currency options 501 (274 ) 227 (144 ) — 83 Client interest rate derivatives 2,546 — 2,546 (2,546 ) — — Total derivative assets: 41,660 (274 ) 41,386 (22,172 ) (7,781 ) 11,433 Reverse repurchase, securities borrowing, and similar arrangements 95,611 — 95,611 (95,611 ) — — Total $ 137,271 $ (274 ) $ 136,997 $ (117,783 ) $ (7,781 ) $ 11,433
Offsetting Liabilities	The following table summarizes our liabilities subject to enforceable master netting arrangements as of September 30, 2015 and December 31, 2014 : Gross Amounts Not Offset in the Statement of Financial Position But Subject to Master Netting Arrangements (Dollars in thousands) Gross Amounts of Recognized Liabilities Gross Amounts offset in the Statement of Financial Position Net Amounts of Liabilities Presented in the Statement of Financial Position Financial Instruments Cash Collateral Pledged Net Amount September 30, 2015 Derivative Liabilities: Foreign exchange forwards $ 28,693 $ — $ 28,693 $ (10,329 ) $ — $ 18,364 Foreign currency options 322 (76 ) 246 (94 ) — 152 Client interest rate derivatives 5,719 — 5,719 (5,719 ) — — Total derivative liabilities: 34,734 (76 ) 34,658 (16,142 ) — 18,516 Repurchase, securities lending, and similar arrangements — — — — — — Total $ 34,734 $ (76 ) $ 34,658 $ (16,142 ) $ — $ 18,516 December 31, 2014 Derivative Liabilities: Foreign exchange forwards $ 28,136 $ — $ 28,136 $ (16,808 ) $ — $ 11,328 Foreign currency options 501 (274 ) 227 (83 ) — 144 Client interest rate derivatives 2,748 — 2,748 (2,748 ) — — Total derivative liabilities: 31,385 (274 ) 31,111 (19,639 ) — 11,472 Repurchase, securities lending, and similar arrangements — — — — — — Total $ 31,385 $ (274 ) $ 31,111 $ (19,639 ) $ — $ 11,472

Other Noninterest Income and 35

Other Noninterest Income and Other Noninterest Expense (Tables)	9 Months Ended
	Sep. 30, 2015
Other Income and Expenses [Abstract]
Summary of Other Noninterest Income	A summary of other noninterest income for the three and nine months ended September 30, 2015 and 2014 is as follows: Three months ended September 30, Nine months ended September 30, (Dollars in thousands) 2015 2014 2015 2014 Fund management fees $ 4,074 $ 3,574 $ 11,657 $ 9,888 Service-based fee income 1,931 2,180 6,450 6,459 Gains (losses) on revaluation of foreign currency instruments (1) 186 (12,640 ) (11,667 ) (12,347 ) Other (2) (3) 4,886 1,525 15,875 10,601 Total other noninterest income $ 11,077 $ (5,361 ) $ 22,315 $ 14,601 (1) Represents the revaluation of foreign currency denominated financial instruments issued and held by us, primarily loans, deposits and cash. (2) Includes dividends on FHLB/FRB stock, correspondent bank rebate income and other fee income. (3) Amount for the nine months ended September 30, 2015 has been revised to reflect the retrospective application of new accounting guidance adopted in the second quarter of 2015 related to our consolidated variable interest entities (ASU 2015-02). Amount prior to January 1, 2015 has not been revised for the adoption of this guidance. See Note 1— "Basis of Presentation” of the “Notes to Interim Consolidated Financial Statements (unaudited)” under Part I, Item 1 of this report for additional details.
Summary of Other Noninterest Expense	A summary of other noninterest expense for the three and nine months ended September 30, 2015 and 2014 is as follows: Three months ended September 30, Nine months ended September 30, (Dollars in thousands) 2015 2014 2015 2014 Lending and other client related processing costs $ 3,608 $ 3,215 $ 10,861 $ 8,160 Telephone 2,224 1,931 6,727 5,217 Data processing services 2,083 2,229 5,274 6,497 Postage and supplies 728 763 2,220 2,248 Dues and publications 521 719 1,803 1,852 Other (1) 5,106 4,711 15,216 9,381 Total other noninterest expense (2) $ 14,270 $ 13,568 $ 42,101 $ 33,355 (1) Amount for the nine months ended September 30, 2015 has been revised to reflect the retrospective application of new accounting guidance adopted in the second quarter of 2015 related to our consolidated variable interest entities (ASU 2015-02). Amount prior to January 1, 2015 has not been revised for the adoption of this guidance. See Note 1— "Basis of Presentation” of the “Notes to Interim Consolidated Financial Statements (unaudited)” under Part I, Item 1 of this report for additional details. (2) 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 1— "Basis of Presentation" of the "Notes to Interim Consolidated Financial Statements" under Part I, Item 1 in this report.

Segment Reporting (Tables)

Segment Reporting (Tables)	9 Months Ended
	Sep. 30, 2015
Segment Reporting [Abstract]
Segment Reporting	Our segment information for the three and nine months ended September 30, 2015 and 2014 is as follows: (Dollars in thousands) Global Commercial Bank (1) SVB Private Bank SVB Capital (1) Other Items (2) Total Three months ended September 30, 2015 Net interest income $ 217,929 $ 11,667 $ 1 $ 25,063 $ 254,660 Provision for loan losses (32,076 ) (1,327 ) — — (33,403 ) Noninterest income 68,517 506 17,332 22,122 108,477 Noninterest expense (3) (135,504 ) (2,703 ) (3,745 ) (42,803 ) (184,755 ) Income before income tax expense (4) $ 118,866 $ 8,143 $ 13,588 $ 4,382 $ 144,979 Total average loans, net of unearned income $ 13,031,928 $ 1,669,858 $ — 214,866 $ 14,916,652 Total average assets (5) 40,211,915 1,273,823 334,045 199,441 42,019,224 Total average deposits 36,149,772 1,041,773 — 191,522 37,383,067 Three months ended September 30, 2014 Net interest income $ 187,184 $ 7,344 $ 12 $ 26,025 $ 220,565 Provision for loan losses (16,185 ) (425 ) — — (16,610 ) Noninterest income 57,714 491 1,064 20,898 80,167 Noninterest expense (3) (127,050 ) (2,574 ) (3,036 ) (47,101 ) (179,761 ) Income before income tax expense (4) $ 101,663 $ 4,836 $ (1,960 ) $ (178 ) $ 104,361 Total average loans, net of unearned income $ 10,022,333 $ 1,189,976 $ — 227,212 $ 11,439,521 Total average assets (5) 31,916,581 1,128,938 302,949 1,247,597 34,596,065 Total average deposits 28,795,499 877,701 — 53,084 29,726,284 Nine months ended September 30, 2015 Net interest income $ 625,618 $ 32,499 $ 3 $ 79,236 $ 737,356 Provision for loan losses (64,128 ) (2,240 ) — — (66,368 ) Noninterest income 197,740 1,498 57,919 101,131 358,288 Noninterest expense (3) (415,245 ) (8,589 ) (10,935 ) (134,639 ) (569,408 ) Income before income tax expense (4) $ 343,985 $ 23,168 $ 46,987 $ 45,728 $ 459,868 Total average loans, net of unearned income $ 12,721,208 $ 1,529,095 $ — 181,482 $ 14,431,785 Total average assets (5) 37,954,846 1,659,981 335,136 (38,438 ) 39,911,525 Total average deposits 34,125,675 1,125,345 — 162,333 35,413,353 Nine months ended September 30, 2014 Net interest income $ 540,533 $ 23,529 $ 55 $ 57,741 $ 621,858 (Provision for) reduction of loan losses (18,833 ) (218 ) — — (19,051 ) Noninterest income 169,376 1,121 35,617 198,488 404,602 Noninterest expense (3) (369,587 ) (7,709 ) (8,815 ) (135,002 ) (521,113 ) Income before income tax expense (4) $ 321,489 $ 16,723 $ 26,857 $ 121,227 $ 486,296 Total average loans, net of unearned income $ 9,766,870 $ 1,119,618 $ — 211,909 $ 11,098,397 Total average assets (5) 28,924,331 1,026,678 328,048 1,123,895 31,402,952 Total average deposits 26,020,715 805,167 — 56,231 26,882,113 (1) Global Commercial Bank’s and SVB Capital’s components of net interest income, noninterest income, noninterest expense and total average assets are shown net of noncontrolling interests for all periods presented. Noncontrolling interest is included within "Other Items". (2) The "Other Items" column reflects the adjustments necessary to reconcile the results of the operating segments to the consolidated financial statements prepared in conformity with GAAP. Noninterest income is primarily attributable to noncontrolling interests and gains on equity warrant assets. Noninterest expense primarily consists of expenses associated with corporate support functions such as finance, human resources, marketing, legal and other expenses. (3) The Global Commercial Bank segment includes direct depreciation and amortization of $4.7 million and $5.4 million for the three months September 30, 2015 and 2014 , respectively, and $14.4 million and $15.4 million for the nine months ended September 30, 2015 and 2014 , respectively. (4) The internal reporting model used by management to assess segment performance does not calculate income tax expense by segment. Our effective tax rate is a reasonable approximation of the segment rates. (5) Total average assets equal the greater of total average assets or the sum of total average liabilities and total average stockholders’ equity for each segment which contributes to the negative balances reported in "Other Items" to reconcile the results to the consolidated financial statements prepared in conformity with GAAP.

Off-Balance Sheet Arrangement37

Off-Balance Sheet Arrangements, Guarantees and Other Commitments (Tables)	9 Months Ended
	Sep. 30, 2015
Disclosure Off Balance Sheet Arrangements Guarantees And Other Commitments Additional Information [Abstract]
Summary Information Related to Commitments to Extend Credit (Excluding Letters of Credit)	The following table summarizes information related to our commitments to extend credit at September 30, 2015 and December 31, 2014 : (Dollars in thousands) September 30, 2015 December 31, 2014 Loan commitments available for funding: (1) Fixed interest rate commitments $ 1,393,396 $ 1,591,408 Variable interest rate commitments 13,302,099 11,860,039 Total loan commitments available for funding 14,695,495 13,451,447 Commercial and standby letters of credit (2) 1,391,812 1,254,338 Total unfunded credit commitments $ 16,087,307 $ 14,705,785 Commitments unavailable for funding (3) $ 2,141,183 $ 1,868,489 Maximum lending limits for accounts receivable factoring arrangements (4) 1,084,623 1,044,548 Reserve for unfunded credit commitments (5) 36,631 36,419 (1) Represents commitments which are available for funding, due to clients meeting all collateral, compliance and financial covenants required under loan commitment agreements. (2) See below for additional information on our commercial and standby letters of credit. (3) Represents commitments which are currently unavailable for funding, due to clients failing to meet all collateral, compliance and financial covenants under loan commitment agreements. (4) We extend credit under accounts receivable factoring arrangements when our clients’ sales invoices are deemed creditworthy under existing underwriting practices. (5) Our reserve for unfunded credit commitments includes an allowance for both our unfunded loan commitments and our letters of credit.
Summary of Commercial and Standby Letters of Credit	The table below summarizes our commercial and standby letters of credit at September 30, 2015 . The maximum potential amount of future payments represents the amount that could be remitted under letters of credit if there were a total default by the guaranteed parties, without consideration of possible recoveries under recourse provisions or from the collateral held or pledged. (Dollars in thousands) Expires In One Year or Less Expires After One Year Total Amount Outstanding Maximum Amount of Future Payments Financial standby letters of credit $ 1,251,147 $ 68,343 $ 1,319,490 $ 1,319,490 Performance standby letters of credit 50,220 10,209 60,429 60,429 Commercial letters of credit 11,893 — 11,893 11,893 Total $ 1,313,260 $ 78,552 $ 1,391,812 $ 1,391,812
Total Capital Commitments, Unfunded Capital Commitments, and Ownership in Each Fund	The following table details our total capital commitments, unfunded capital commitments, and our ownership percentage in each fund at September 30, 2015 : Our Ownership in Venture Capital and Private Equity Funds (Dollars in thousands) SVBFG Capital Commitments SVBFG Unfunded Commitments SVBFG Ownership of each Fund (4) Silicon Valley BancVentures, LP $ 6,000 $ 270 10.7 % SVB Capital Partners II, LP (1) 1,200 162 5.1 SVB Capital Shanghai Yangpu Venture Capital Fund 935 — 6.8 SVB Strategic Investors Fund, LP 15,300 688 12.6 SVB Strategic Investors Fund II, LP 15,000 1,050 8.6 SVB Strategic Investors Fund III, LP 15,000 1,275 5.9 SVB Strategic Investors Fund IV, LP 12,239 2,325 5.0 Strategic Investors Fund V Funds 515 177 Various SVB Capital Preferred Return Fund, LP 12,688 — 20.0 SVB Capital—NT Growth Partners, LP 24,670 1,340 33.0 Other private equity fund (2) 9,338 — 58.2 Debt funds 73,830 — Various Other fund investments (3) 299,977 12,064 Various Total $ 486,692 $ 19,351 (1) Our ownership includes direct ownership of 1.3 percent and indirect ownership interest of 3.8 percent through our investment in SVB Strategic Investors Fund II, LP. (2) Our ownership includes direct ownership of 41.5 percent and indirect ownership interests of 12.6 percent and 4.1 percent in the fund through our ownership interest of SVB Capital - NT Growth Partners, LP and SVB Capital Preferred Return Fund, LP, respectively. (3) Represents commitments to 276 funds (primarily venture capital funds) where our ownership interest is generally less than 5 percent of the voting interests of each such fund. (4) We are subject to the Volcker Rule, which restricts or limits us from sponsoring or having ownership interests in “covered” funds including venture capital and private equity funds. See “Business - Supervision and Regulation” under Item 1 of Part I of our 2014 Form 10-K.
Remaining Unfunded Commitments to Venture Capital or Private Equity Funds by Consolidated Managed Funds	The following table details the amounts of remaining unfunded commitments to venture capital and private equity funds by our consolidated managed funds of funds (including our interest and the noncontrolling interests) at September 30, 2015 : Limited Partnership (Dollars in thousands) Unfunded Commitments SVB Strategic Investors Fund, LP $ 2,250 SVB Capital Preferred Return Fund, LP 4,673 SVB Capital—NT Growth Partners, LP 3,878 Other private equity fund 77 Total $ 10,878

Fair Value of Financial Instr38

Fair Value of Financial Instruments (Tables)	9 Months Ended
	Sep. 30, 2015
Fair Value Disclosures [Abstract]
Fair Value Hierarchy Tables Present Information about Assets and Liabilities Measured at Fair Value on a Recurring Basis	The following fair value hierarchy table presents information about our assets and liabilities that are measured at fair value on a recurring basis as of September 30, 2015 : (Dollars in thousands) Level 1 Level 2 Level 3 Balance at September 30, 2015 Assets Available-for-sale securities: U.S. treasury securities $ 10,197,025 $ — $ — $ 10,197,025 U.S. agency debentures — 2,942,968 — 2,942,968 Residential mortgage-backed securities: Agency-issued collateralized mortgage obligations - fixed rate — 1,517,702 — 1,517,702 Agency-issued collateralized mortgage obligations - variable rate — 645,288 — 645,288 Equity securities 691 3,987 — 4,678 Total available-for-sale securities 10,197,716 5,109,945 — 15,307,661 Non-marketable and other securities (fair value accounting): Non-marketable securities: Venture capital and private equity fund investments measured at net asset value (1) — — — 154,660 Other venture capital investments — — 3,390 3,390 Other securities 779 — — 779 Total non-marketable and other securities (fair value accounting) 779 — 3,390 158,829 Other assets: Interest rate swaps — 3,485 — 3,485 Foreign exchange forward and option contracts — 33,271 — 33,271 Equity warrant assets — 1,648 128,443 130,091 Client interest rate derivatives — 5,164 — 5,164 Total assets (2) $ 10,198,495 $ 5,153,513 $ 131,833 $ 15,638,501 Liabilities Foreign exchange forward and option contracts $ — $ 28,939 $ — $ 28,939 Client interest rate derivatives — 5,719 — 5,719 Total liabilities $ — $ 34,658 $ — $ 34,658 (1) In accordance with the accounting standard (ASU 2015-07, Fair Value Measurement (Topic 820)), certain investments that are measured at fair value using the net asset value per share (or its equivalent) practical expedient have not been classified in the fair value hierarchy. The fair value amounts presented in this table are intended to permit reconciliation of the fair value hierarchy to the amounts presented in the statement of financial position. See Note 1— "Basis of Presentation" of the "Notes to Interim Consolidated Financial Statements" under Part I, Item 1 in this report. (2) Included in Level 1 and Level 3 assets are $0.6 million and $3 million , respectively, attributable to noncontrolling interests calculated based on the ownership percentages of the noncontrolling interests. The following fair value hierarchy table presents information about our assets and liabilities that are measured at fair value on a recurring basis as of December 31, 2014 : (Dollars in thousands) Level 1 Level 2 Level 3 Balance at December 31, 2014 Assets Available-for-sale securities: U.S. treasury securities $ 7,302,273 $ — $ — $ 7,302,273 U.S. agency debentures — 3,561,556 — 3,561,556 Residential mortgage-backed securities: Agency-issued collateralized mortgage obligations - fixed rate — 1,884,843 — 1,884,843 Agency-issued collateralized mortgage obligations - variable rate — 784,475 — 784,475 Equity securities 4,290 3,218 — 7,508 Total available-for-sale securities 7,306,563 6,234,092 — 13,540,655 Non-marketable and other securities (fair value accounting): Non-marketable securities: Venture capital and private equity fund investments measured at net asset value (1) — — — 1,130,882 Other venture capital investments — — 71,204 71,204 Other securities 108,251 — — 108,251 Total non-marketable and other securities (fair value accounting) 108,251 — 71,204 1,310,337 Other assets: Interest rate swaps — 4,609 — 4,609 Foreign exchange forward and option contracts — 34,231 — 34,231 Equity warrant assets — 1,906 114,698 116,604 Client interest rate derivatives — 2,546 — 2,546 Total assets (2) $ 7,414,814 $ 6,277,384 $ 185,902 $ 15,008,982 Liabilities Foreign exchange forward and option contracts $ — $ 28,363 $ — $ 28,363 Client interest rate derivatives — 2,748 — 2,748 Total liabilities $ — $ 31,111 $ — $ 31,111 (1) In accordance with the accounting standard (ASU 2015-07, Fair Value Measurement (Topic 820)), certain investments that are measured at fair value using the net asset value per share (or its equivalent) practical expedient have not been classified in the fair value hierarchy. See Note 1— "Basis of Presentation" of the "Notes to Interim Consolidated Financial Statements" under Part I, Item 1 in this report. (2) Included in Level 1 and Level 3 assets are $100 million and $69 million , respectively, attributable to noncontrolling interests calculated based on the ownership percentages of the noncontrolling interests.
Additional Information about Level 3 Assets Measured at Fair Value on a Recurring Basis	The following table presents additional information about Level 3 assets measured at fair value on a recurring basis for the three and nine months ended September 30, 2015 and 2014 , respectively: (Dollars in thousands) Beginning Balance Total Realized and Unrealized Gains Included in Income Purchases Sales Issuances Distributions and Other Settlements Transfers Out of Level 3 Ending Balance Three months ended September 30, 2015 Non-marketable and other securities (fair value accounting): Other venture capital investments $ 3,390 $ 15 $ — $ — $ — $ (15 ) $ — $ 3,390 Total non-marketable and other securities (fair value accounting) (1) 3,390 15 — — — (15 ) — 3,390 Other assets: Equity warrant assets (2) 120,037 11,551 — (6,215 ) 3,057 499 (486 ) 128,443 Total assets $ 123,427 $ 11,566 $ — $ (6,215 ) $ 3,057 $ 484 $ (486 ) $ 131,833 Three months ended September 30, 2014 Non-marketable and other securities (fair value accounting): Other venture capital investments $ 43,747 $ 5,546 $ 6,304 $ (11,122 ) $ — $ (612 ) $ — $ 43,863 Other securities (fair value accounting) 5,808 — — — — — (5,808 ) — Total non-marketable and other securities (fair value accounting) (1) 49,555 5,546 6,304 (11,122 ) — (612 ) (5,808 ) 43,863 Other assets: Equity warrant assets (2) 87,151 13,805 — (10,564 ) 2,932 510 (437 ) 93,397 Total assets $ 136,706 $ 19,351 $ 6,304 $ (21,686 ) $ 2,932 $ (102 ) $ (6,245 ) $ 137,260 Nine months ended September 30, 2015 Non-marketable and other securities (fair value accounting): Other venture capital investments (3) $ 3,291 $ 146 $ — $ (32 ) $ — $ (15 ) $ — $ 3,390 Total non-marketable and other securities (fair value accounting) (1) 3,291 146 — (32 ) — (15 ) — 3,390 Other assets: Equity warrant assets (2) 114,698 54,884 — (48,374 ) 7,607 1,249 (1,621 ) 128,443 Total assets $ 117,989 $ 55,030 $ — $ (48,406 ) $ 7,607 $ 1,234 $ (1,621 ) $ 131,833 Nine months ended September 30, 2014 Non-marketable and other securities (fair value accounting): Other venture capital investments $ 32,839 $ 8,060 $ 22,800 $ (15,561 ) $ — $ (4,149 ) $ (126 ) $ 43,863 Other securities (fair value accounting) 319,249 104,310 — (46,840 ) — 3,417 (380,136 ) — Total non-marketable and other securities (fair value accounting) (1) 352,088 112,370 22,800 (62,401 ) — (732 ) (380,262 ) 43,863 Other assets: Equity warrant assets (2) 99,891 51,325 — (67,201 ) 9,098 1,718 (1,434 ) 93,397 Total assets $ 451,979 $ 163,695 $ 22,800 $ (129,602 ) $ 9,098 $ 986 $ (381,696 ) $ 137,260 (1) Realized and unrealized gains (losses) are recorded in the line items “gains on investment securities, net” a component of noninterest income. (2) Realized and unrealized gains (losses) are recorded in the line item “gains on derivative instruments, net”, a component of noninterest income. (3) Beginning balance was adjusted to conform with our adoption of the new accounting standard (ASU 2015-02), Amendments to the Consolidation Analysis (Topic 820).
Unrealized Gains Included in Earnings Attributable to Level 3 Assets Held	The following table presents the amount of net unrealized gains and losses included in earnings (which is inclusive of noncontrolling interest) attributable to Level 3 assets still held at September 30, 2015 and 2014 : Three months ended September 30, Nine months ended September 30, (Dollars in thousands) 2015 2014 2015 2014 Non-marketable and other securities (fair value accounting): Other venture capital investments — (1,231 ) 158 78 Other securities — — — 78,967 Total non-marketable and other securities (fair value accounting) (1) — (1,231 ) 158 79,045 Other assets: Equity warrant assets (2) 9,115 6,911 21,597 17,777 Total unrealized gains, net $ 9,115 $ 5,680 $ 21,755 $ 96,822 Unrealized gains (losses) attributable to noncontrolling interests $ — $ (1,137 ) $ 141 $ 72,574 (1) Unrealized gains (losses) are recorded in the line items “gains on investment securities, net”, a component of noninterest income. (2) Unrealized gains (losses) are recorded in the line item “gains on derivative instruments, net”, a component of noninterest income.
Quantitative Information About Significant Unobservable Inputs	The following table presents quantitative information about the significant unobservable inputs used for certain of our Level 3 fair value measurements at September 30, 2015 and December 31, 2014. We have not included in this table our venture capital and private equity fund investments (fair value accounting) as we use net asset value per share (as obtained from the general partners of the investments) as a practical expedient to determine fair value. (Dollars in thousands) Fair value Valuation Technique Significant Unobservable Inputs Weighted Average September 30, 2015: Other venture capital investments (fair value accounting) $ 3,390 Private company equity pricing (1) (1 ) Equity warrant assets (public portfolio) — 4,795 Modified Black-Scholes option pricing model Volatility 39.4 % — Risk-Free interest rate 1.5 % Sales restrictions discount (2) 14.2 % Equity warrant assets (private portfolio) 123,648 Modified Black-Scholes option pricing model Volatility 37.1 % Risk-Free interest rate 0.7 % Marketability discount (3) 17.3 % Remaining life assumption (4) 45.0 % December 31, 2014: Other venture capital investments (fair value accounting) $ 71,204 Private company equity pricing (1) (1 ) Equity warrant assets (public portfolio) 1,681 Modified Black-Scholes option pricing model Volatility 42.6 % Risk-Free interest rate 1.7 % Sales restrictions discount (2) 17.8 % Equity warrant assets (private portfolio) 113,017 Modified Black-Scholes option pricing model Volatility 38.3 % Risk-Free interest rate 0.9 % Marketability discount (3) 20.0 % Remaining life assumption (4) 45.0 % (1) In determining the fair value of our other venture capital investment portfolio, we evaluate a variety of factors related to each underlying private portfolio company including, but not limited to, actual and forecasted results, cash position, recent or planned transactions and market comparable companies. Additionally, we have ongoing communication with the portfolio companies and venture capital fund managers, to determine whether there is a material change in fair value. These factors are specific to each portfolio company and a weighted average or range of values of the unobservable inputs is not meaningful. (2) We adjust quoted market prices of public companies, which are subject to certain sales restrictions. Sales restriction discounts generally range from 10% to 20% depending on the duration of the sales restrictions, which typically range from 3 to 6 months. (3) Our marketability discount is applied to all private company warrants to account for a general lack of liquidity due to the private nature of the associated underlying company. The quantitative measure used is based upon various option-pricing models. On a quarterly basis, a sensitivity analysis is performed on our marketability discount. (4) We adjust the contractual remaining term of private company warrants based on our estimate of the actual remaining life, which we determine by utilizing historical data on cancellations and exercises. At September 30, 2015 , the weighted average contractual remaining term was 5.67 years, compared to our estimated remaining life of 2.55 years. On a quarterly basis, a sensitivity analysis is performed on our remaining life assumption.
Summary of Estimated Fair Values of Financial Instruments Not Carried at Fair Value	Letters of credit are carried at their fair value, which was equivalent to the residual premium or fee at September 30, 2015 and December 31, 2014 . Commitments to extend credit and letters of credit typically result in loans with a market interest rate if funded. The following fair value hierarchy table presents the estimated fair values of our financial instruments that are not carried at fair value at September 30, 2015 and December 31, 2014 : Estimated Fair Value (Dollars in thousands) Carrying Amount Total Level 1 Level 2 Level 3 September 30, 2015: Financial assets: Cash and cash equivalents $ 1,674,145 $ 1,674,145 $ 1,674,145 $ — $ — Held-to-maturity securities 8,306,526 8,367,003 — 8,367,003 — Non-marketable securities (cost and equity method accounting) not measured at net asset value 112,984 115,359 — — 115,359 Non-marketable securities (cost and equity method) accounting measured at net asset value (1) 253,210 374,353 — — — Net commercial loans 13,470,144 13,547,022 — — 13,547,022 Net consumer loans 1,646,929 1,618,492 — — 1,618,492 FHLB and Federal Reserve Bank stock 46,116 46,116 — — 46,116 Accrued interest receivable 98,453 98,453 — 98,453 — Financial liabilities: Other short-term borrowings 3,756 3,756 3,756 — — Non-maturity deposits (2) 36,977,199 36,977,199 36,977,199 — — Time deposits 72,218 72,218 — 72,218 — 3.50% Senior Notes 346,591 342,125 — 342,125 — 5.375% Senior Notes 346,878 391,286 — 391,286 — 6.05% Subordinated Notes (3) 49,028 51,000 — 51,000 — 7.0% Junior Subordinated Debentures 54,714 52,557 — 52,557 — Accrued interest payable 4,992 4,992 — 4,992 — Off-balance sheet financial assets: Commitments to extend credit — 28,805 — — 28,805 December 31, 2014: Financial assets: Cash and cash equivalents $ 1,796,062 $ 1,796,062 $ 1,796,062 $ — $ — Held-to-maturity securities 7,421,042 7,415,656 — 7,415,656 — Non-marketable securities (cost and equity method accounting) not measured at net asset value 108,221 107,451 — — 107,451 Non-marketable securities (cost and equity method) accounting measured at net asset value (1) 188,427 283,119 — — — Net commercial loans 12,947,869 13,082,487 — — 13,082,487 Net consumer loans 1,271,048 1,247,336 — — 1,247,336 FHLB and Federal Reserve Bank stock 53,496 53,496 — — 53,496 Accrued interest receivable 94,180 94,180 — 94,180 — Financial liabilities: Other short-term borrowings 7,781 7,781 7,781 — — Non-maturity deposits (2) 34,215,372 34,215,372 34,215,372 — — Time deposits 128,127 128,107 — 128,107 — 5.375% Senior Notes 346,477 392,616 — 392,616 — 6.05% Subordinated Notes (3) 50,040 53,537 — 53,537 — 7.0% Junior Subordinated Debentures 54,845 52,990 — 52,990 — Accrued interest payable 6,998 6,998 — 6,998 — Off-balance sheet financial assets: Commitments to extend credit — 29,097 — — 29,097 (1) In accordance with the accounting standard (ASU 2015-07, Fair Value Measurement (Topic 820)), certain investments that are measured at fair value using the net asset value per share (or its equivalent) practical expedient have not been classified in the fair value hierarchy. See Note 1— "Basis of Presentation" of the "Notes to Interim Consolidated Financial Statements" under Part I, Item 1 in this report. (2) Includes noninterest-bearing demand deposits, interest-bearing checking accounts, money market accounts and interest-bearing sweep deposits. (3) At September 30, 2015 and December 31, 2014 , included in the carrying value and estimated fair value of our 6.05% Subordinated Notes was an interest rate swap valued at $3.5 million and $4.6 million , respectively, related to hedge accounting associated with the notes.
Summary of Estimated Fair Values of Investments and Remaining Unfunded Commitments for Each Major Category of Investments	The following table is a summary of the estimated fair values of these investments and remaining unfunded commitments for each major category of these investments as of September 30, 2015 : (Dollars in thousands) Carrying Amount Fair Value Unfunded Commitments Non-marketable securities (fair value accounting): Venture capital and private equity fund investments (1) $ 154,660 $ 154,660 $ 10,878 Non-marketable securities (equity method accounting): Venture capital and private equity fund investments (2) 84,197 84,197 4,989 Debt funds (2) 21,217 22,326 — Other investments (2) 24,246 24,246 886 Non-marketable securities (cost method accounting): Venture capital and private equity fund investments (2) 123,550 243,584 9,381 Total $ 407,870 $ 529,013 $ 26,134 (1) Venture capital and private equity fund investments within non-marketable securities (fair value accounting) include investments made by our managed funds of funds and one of our direct venture funds. These investments represent investments in venture capital and private equity funds that invest primarily in U.S. and global technology and life science & healthcare companies. Included in the fair value and unfunded commitments of fund investments under fair value accounting are $111 million and $8 million , respectively, attributable to noncontrolling interests. It is estimated that we will receive distributions from the fund investments over the next 10 to 13 years, depending on the age of the funds and any potential extensions of terms of the funds. (2) Venture capital and private equity fund investments, debt funds, and other fund investments within non-marketable securities (equity and cost method accounting) include funds that invest in or lend money to primarily U.S. and global technology and life science & healthcare companies. It is estimated that we will receive distributions from the funds over the next 10 to 13 years, depending on the age of the funds and any potential extensions of the terms of the funds.

Basis of Presentation (Details)

Basis of Presentation (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013
Accounting Standards Update 2014-01
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Cumulative effect on retained earnings upon adoption of new guidance	$ 4.7	$ 4.6

Basis of Presentation Reclassif

Basis of Presentation Reclassifications for the Adoption of New Accounting Pronouncements (Details) - USD ($) $ in Millions	9 Months Ended	12 Months Ended
	Sep. 30, 2015	Dec. 31, 2014
Accounting Standards Update 2015-03
Debt Instrument [Line Items]
Debt issuance costs	$ 5.1	$ 2.1

Stockholders' Equity and EPS -

Stockholders' Equity and EPS - Reclassifications out of AOCI (Details) - USD ($) $ in Thousands		3 Months Ended		9 Months Ended
		Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015		Sep. 30, 2014
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items]
Related tax expense (benefit)	[1]	$ (57,017)	$ (40,207)	$ (175,057)	[2]	$ (137,431)
Net income available to common stockholders	[1]	81,733	63,977	256,392	[2]	205,880
Reclassification out of Accumulated Other Comprehensive Income | Gains on investment securities, net
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items]
Reclassification adjustment for (gains) losses included in net income		(13)	990	(2,750)		17,411
Related tax expense (benefit)		6	(400)	1,111		(7,030)
Net income available to common stockholders		$ (7)	$ 590	$ (1,639)		$ 10,381
[1]	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 1— "Basis of Presentation" of the "Notes to Interim Consolidated Financial Statements" under Part I, Item 1 in this report.
[2]	Amounts for the nine months ended September 30, 2015, have been revised to reflect the retrospective application of new accounting guidance adopted in the second quarter of 2015 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 1— "Basis of Presentation” of the “Notes to Interim Consolidated Financial Statements (unaudited)” under Part I, Item 1 of this report for additional details.

Stockholders' Equity and EPS 42

Stockholders' Equity and EPS - Reconciliation of Basic EPS to Diluted EPS (Detail) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands		3 Months Ended		9 Months Ended
		Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015		Sep. 30, 2014
Numerator:
Net income available to common stockholders	[1]	$ 81,733	$ 63,977	$ 256,392	[2]	$ 205,880
Denominator:
Weighted average common shares outstanding-basic (in shares)		51,479	50,752	51,254		48,281
Denominator for diluted calculation (in shares)		52,048	51,571	51,878		49,200
Earnings per common share:
Basic (dollars per share)	[1]	$ 1.59	$ 1.26	$ 5	[2]	$ 4.26
Diluted (dollars per share)		$ 1.57	$ 1.24	$ 4.94	[2]	$ 4.18
Stock options and ESPP
Denominator:
Weighted average effect of dilutive securities (in shares)		382	534	411		580
Restricted stock units
Denominator:
Weighted average effect of dilutive securities (in shares)		187	285	213		339
[1]	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 1— "Basis of Presentation" of the "Notes to Interim Consolidated Financial Statements" under Part I, Item 1 in this report.
[2]	Amounts for the nine months ended September 30, 2015, have been revised to reflect the retrospective application of new accounting guidance adopted in the second quarter of 2015 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 1— "Basis of Presentation” of the “Notes to Interim Consolidated Financial Statements (unaudited)” under Part I, Item 1 of this report for additional details.

Stockholders' Equity and EPS 43

Stockholders' Equity and EPS - Common Shares Excluded from Diluted EPS Calculation as They Were Deemed to be Anti-Dilutive (Detail) - shares shares in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Shares excluded from diluted earnings per share calculation	143	242	169	142
Stock options
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Shares excluded from diluted earnings per share calculation	142	241	169	140
Restricted stock units
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Shares excluded from diluted earnings per share calculation	1	1	0	2

Share-Based Compensation - Shar

Share-Based Compensation - Share Based Compensation and Related Tax Benefits (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Share-based compensation expense	$ 8,188	$ 7,520	$ 24,174	$ 22,285
Income tax benefit related to share-based compensation expense	$ (3,051)	$ (2,676)	$ (8,381)	$ (7,351)

Share-Based Compensation - Unre

Share-Based Compensation - Unrecognized Compensation Expense (Detail) $ in Thousands	9 Months Ended
	Sep. 30, 2015USD ($)
Unrecognized Share Based Compensation Expense [Line Items]
Unrecognized Expense	$ 54,482
Stock options
Unrecognized Share Based Compensation Expense [Line Items]
Unrecognized Expense	$ 12,756
Average Expected Recognition Period - in Years	2 years 5 months 12 days
Restricted stock units
Unrecognized Share Based Compensation Expense [Line Items]
Unrecognized Expense	$ 41,726
Average Expected Recognition Period - in Years	2 years 7 months 21 days

Share-Based Compensation - Sh46

Share-Based Compensation - Share-Based Payment Award Activity (Detail)	9 Months Ended
	Sep. 30, 2015USD ($)$ / sharesshares
Options
Outstanding, beginning of period | shares	1,394,888
Granted | shares	122,120
Exercised | shares	(311,575)
Forfeited | shares	(22,008)
Expired | shares	(1,520)
Outstanding, end of period | shares	1,181,905
Vested and expected to vest, end of period | shares	1,145,732
Exercisable, end of period | shares	656,191
Weighted Average Exercise Price
Outstanding, beginning of period	$ 66.03
Granted	129.30
Exercised	51.34
Forfeited	84.40
Expired	48.76
Outstanding, end of period	76.12
Vested and expected to vest, end of period	75.24
Exercisable, end of period	$ 60.34
Weighted Average Remaining Contractual Life in Years
Outstanding, end of period	4 years
Vested and expected to vest, end of period	3 years 11 months 12 days
Exercisable, end of period	3 years 4 days
Aggregate Intrinsic Value of In-The- Money Options
Outstanding, end of period | $	$ 48,295,069
Vested and expected to vest, end of period | $	47,717,566
Exercisable, end of period | $	$ 36,230,256

Share-Based Compensation - Addi

Share-Based Compensation - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Closing stock price	$ 115.54		$ 115.54
Total intrinsic value of options exercised	$ 2.2	$ 7.7	$ 24	$ 18.4

Share-Based Compensation - Info

Share-Based Compensation - Information for Restricted Stock Units under Equity Incentive Plan (Detail) - Restricted stock units	9 Months Ended
	Sep. 30, 2015$ / sharesshares
Shares
Nonvested, beginning of period | shares	614,666
Granted | shares	231,205
Vested | shares	(211,652)
Forfeited | shares	(19,292)
Nonvested, end of period | shares	614,927
Weighted Average Grant Date Fair Value
Nonvested, beginning of period	$ 79.92
Granted	129.22
Vested	74.02
Forfeited	88.51
Nonvested, end of period	$ 101.01

Variable Interest Entities - Ca

Variable Interest Entities - Carrying Amounts and Classification of Significant Variable Interests (Details) - USD ($) $ in Thousands		Sep. 30, 2015	Dec. 31, 2014	Sep. 30, 2014	[1]	Dec. 31, 2013	[1],[2]
Variable Interest Entity [Line Items]
Cash and cash equivalents		$ 1,674,145	$ 1,796,062	$ 1,872,537		$ 1,538,779
Non-marketable and other securities	[3]	650,555	1,728,140
Accrued interest receivable and other assets	[3]	580,370	553,208
Total assets		41,730,982	39,337,869
Other liabilities		566,370	483,493
Total liabilities		38,416,754	$ 35,286,135
Maximum Exposure to Loss in Unconsolidated VIEs		341,065
Consolidated
Variable Interest Entity [Line Items]
Cash and cash equivalents		18,769
Non-marketable and other securities		204,555
Accrued interest receivable and other assets		375
Total assets		223,699
Other liabilities		421
Accrued expenses and other liabilities		0
Total liabilities		421
Maximum Exposure to Loss in Unconsolidated VIEs		223,300
Unconsolidated
Variable Interest Entity [Line Items]
Non-marketable and other securities		341,065
Total assets		341,065
Accrued expenses and other liabilities		65,305
Total liabilities		65,305
Maximum Exposure to Loss in Unconsolidated VIEs		341,100
Low Income Housing Tax Credit Funds | Consolidated
Variable Interest Entity [Line Items]
Non-marketable and other securities		$ 125,500
[1]	Cash flows for the nine months ended September 30, 2015 were revised to reflect the adoption of ASU 2015-02 as of January 1, 2015 and cash flows for the nine months ended September 30, 2014 were revised to reflect the retrospective application of our adoption of ASU 2014-01.
[2]	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.
[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 1— "Basis of Presentation" of the "Notes to Interim Consolidated Financial Statements" under Part I, Item 1 in this report.

Variable Interest Entities - Ad

Variable Interest Entities - Additional Information (Details) $ in Thousands		Sep. 30, 2015USD ($)entity	Dec. 31, 2014USD ($)		Sep. 30, 2014USD ($)	[1]	Dec. 31, 2013USD ($)
Variable Interest Entity [Line Items]
Number of deconsolidated entities | entity		16
Assets		$ (41,730,982)	$ (39,337,869)
Total equity		$ (3,314,228)	(4,051,734)	[1]	$ (3,936,168)		$ (3,074,693)
Number of consolidated entities | entity		5
Non-marketable and other securities	[2]	$ 650,555	$ 1,728,140
Consolidated
Variable Interest Entity [Line Items]
Assets		(223,699)
Non-marketable and other securities		204,555
Cumulative-Effect Adjustment, Deconsolidation of Variable Interest Entity
Variable Interest Entity [Line Items]
Assets		1,100,000
Total equity		1,200,000
Low Income Housing Tax Credit Funds | Consolidated
Variable Interest Entity [Line Items]
Non-marketable and other securities		125,500
Unfunded commitments | Consolidated
Variable Interest Entity [Line Items]
Non-marketable and other securities		$ 65,300
[1]	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 1— "Basis of Presentation" of the "Notes to Interim Consolidated Financial Statements" under Part I, Item 1 in this report.
[2]	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 1— "Basis of Presentation" of the "Notes to Interim Consolidated Financial Statements" under Part I, Item 1 in this report.

Cash and Cash Equivalents (Deta

Cash and Cash Equivalents (Detail) - USD ($) $ in Thousands	Sep. 30, 2015	Dec. 31, 2014	Sep. 30, 2014	[1]	Dec. 31, 2013	[1],[2]
Cash and Cash Equivalents [Abstract]
Cash and due from banks	$ 1,454,538	$ 1,694,329
Securities purchased under agreements to resell	214,484	95,611
Other short-term investment securities	5,123	6,122
Total cash and cash equivalents	$ 1,674,145	$ 1,796,062	$ 1,872,537		$ 1,538,779
[1]	Cash flows for the nine months ended September 30, 2015 were revised to reflect the adoption of ASU 2015-02 as of January 1, 2015 and cash flows for the nine months ended September 30, 2014 were revised to reflect the retrospective application of our adoption of ASU 2014-01.
[2]	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.

Cash and Cash Equivalents (Addi

Cash and Cash Equivalents (Additional Information) (Detail) - USD ($)	Sep. 30, 2015	Dec. 31, 2014
Cash and Cash Equivalents [Abstract]
Deposits at the Federal Reserve Bank earning interest at the Federal Funds target rate	$ 639,000,000	$ 861,000,000
Interest-earning deposits in other financial institutions	429,000,000	440,000,000
Fair value of securities purchased under agreements to resell	219,000,000	98,000,000
Fair value of securities received as collateral that have been resold or repledged	$ 0	$ 0

Investment Securities - Major C

Investment Securities - Major Components of Investment Securities Portfolio (Detail) - USD ($) $ in Thousands	Sep. 30, 2015	Dec. 31, 2014
Investment Holdings [Line Items]
Amortized Cost	$ 15,167,233	$ 13,497,945
Unrealized Gains	149,059	70,853
Unrealized Losses	(8,631)	(28,143)
Carrying Value	15,307,661	13,540,655
U.S. treasury securities
Investment Holdings [Line Items]
Amortized Cost	10,103,580	7,289,135
Unrealized Gains	93,458	17,524
Unrealized Losses	(13)	(4,386)
Carrying Value	10,197,025	7,302,273
U.S. agency debentures
Investment Holdings [Line Items]
Amortized Cost	2,902,479	3,540,055
Unrealized Gains	40,502	30,478
Unrealized Losses	(13)	(8,977)
Carrying Value	2,942,968	3,561,556
Residential mortgage-backed securities | Agency-issued collateralized mortgage obligations | Fixed rate
Investment Holdings [Line Items]
Amortized Cost	1,513,691	1,884,450
Unrealized Gains	10,652	14,851
Unrealized Losses	(6,641)	(14,458)
Carrying Value	1,517,702	1,884,843
Residential mortgage-backed securities | Agency-issued collateralized mortgage obligations | Variable rate
Investment Holdings [Line Items]
Amortized Cost	641,057	779,103
Unrealized Gains	4,231	5,372
Unrealized Losses	0	0
Carrying Value	645,288	784,475
Equity securities
Investment Holdings [Line Items]
Amortized Cost	6,426	5,202
Unrealized Gains	216	2,628
Unrealized Losses	(1,964)	(322)
Carrying Value	$ 4,678	$ 7,508

Investment Securities - Summary

Investment Securities - Summary of Unrealized Losses on Available for Sale Securities (Detail) $ in Thousands	Sep. 30, 2015USD ($)Investment	Dec. 31, 2014USD ($)Investment
Investments, Unrealized Loss Position [Line Items]
Less than 12 months - Fair Value of Investments	$ 302,363	$ 3,209,821
Less than 12 months - Unrealized Losses	(2,455)	(8,301)
12 months or longer - Unrealized Losses	396,781	961,186
12 months or longer - Unrealized Losses	(6,176)	(19,842)
Fair Value of Investments	699,144	4,171,007
Unrealized Losses	$ (8,631)	$ (28,143)
Number of investments in unrealized loss position | Investment	43	115
Number of investments with unrealized losses greater than 12 months | Investment	18	33
U.S. treasury securities
Investments, Unrealized Loss Position [Line Items]
Less than 12 months - Fair Value of Investments	$ 51,576	$ 2,297,895
Less than 12 months - Unrealized Losses	(13)	(4,386)
12 months or longer - Unrealized Losses	0	0
12 months or longer - Unrealized Losses	0	0
Fair Value of Investments	51,576	2,297,895
Unrealized Losses	(13)	(4,386)
U.S. agency debentures
Investments, Unrealized Loss Position [Line Items]
Less than 12 months - Fair Value of Investments	17,424	249,266
Less than 12 months - Unrealized Losses	(13)	(489)
12 months or longer - Unrealized Losses	0	507,385
12 months or longer - Unrealized Losses	0	(8,488)
Fair Value of Investments	17,424	756,651
Unrealized Losses	(13)	(8,977)
Residential mortgage-backed securities | Agency-issued collateralized mortgage obligations | Fixed rate
Investments, Unrealized Loss Position [Line Items]
Less than 12 months - Fair Value of Investments	230,141	662,092
Less than 12 months - Unrealized Losses	(465)	(3,104)
12 months or longer - Unrealized Losses	396,781	453,801
12 months or longer - Unrealized Losses	(6,176)	(11,354)
Fair Value of Investments	626,922	1,115,893
Unrealized Losses	(6,641)	(14,458)
Equity securities
Investments, Unrealized Loss Position [Line Items]
Less than 12 months - Fair Value of Investments	3,222	568
Less than 12 months - Unrealized Losses	$ (1,964)	(322)
12 months or longer - Unrealized Losses		0
12 months or longer - Unrealized Losses		0
Fair Value of Investments	$ 3,222	568
Unrealized Losses	$ (1,964)	$ (322)

Investment Securities - Summa55

Investment Securities - Summary of Remaining Contractual Principal Maturities and Fully Taxable Equivalent Yields on Debt Securities Classified as Available for Sale (Detail) - Available-for-sale Securities $ in Thousands	9 Months Ended
	Sep. 30, 2015USD ($)
Investments Classified by Contractual Maturity Date [Line Items]
Available-for-sale Securities, Debt Securities	$ 15,302,983
Weighted- Average Yield	1.31%
One Year or Less - Carrying Value	$ 1,774,732
One Year or Less - Weighted- Average Yield	1.04%
After One Year to Five Years - Carrying Value	$ 10,777,733
After One Year to Five Years - Weighted- Average Yield	1.26%
After Five Years to Ten Years - Carrying Value	$ 1,157,931
After Five Years to Ten Years - Weighted- Average Yield	2.21%
After Ten Years - Carrying Value	$ 1,592,587
After Ten Years - Weighted- Average Yield	1.27%
U.S. treasury securities
Investments Classified by Contractual Maturity Date [Line Items]
Available-for-sale Securities, Debt Securities	$ 10,197,025
Weighted- Average Yield	1.16%
One Year or Less - Carrying Value	$ 953,659
One Year or Less - Weighted- Average Yield	0.45%
After One Year to Five Years - Carrying Value	$ 8,806,490
After One Year to Five Years - Weighted- Average Yield	1.20%
After Five Years to Ten Years - Carrying Value	$ 436,876
After Five Years to Ten Years - Weighted- Average Yield	1.75%
After Ten Years - Carrying Value	$ 0
After Ten Years - Weighted- Average Yield	0.00%
U.S. agency debentures
Investments Classified by Contractual Maturity Date [Line Items]
Available-for-sale Securities, Debt Securities	$ 2,942,968
Weighted- Average Yield	1.63%
One Year or Less - Carrying Value	$ 821,073
One Year or Less - Weighted- Average Yield	1.73%
After One Year to Five Years - Carrying Value	$ 1,971,243
After One Year to Five Years - Weighted- Average Yield	1.53%
After Five Years to Ten Years - Carrying Value	$ 150,652
After Five Years to Ten Years - Weighted- Average Yield	2.49%
After Ten Years - Carrying Value	$ 0
After Ten Years - Weighted- Average Yield	0.00%
Residential mortgage-backed securities | Agency-issued collateralized mortgage obligations | Fixed rate
Investments Classified by Contractual Maturity Date [Line Items]
Available-for-sale Securities, Debt Securities	$ 1,517,702
Weighted- Average Yield	1.96%
One Year or Less - Carrying Value	$ 0
One Year or Less - Weighted- Average Yield	0.00%
After One Year to Five Years - Carrying Value	$ 0
After One Year to Five Years - Weighted- Average Yield	0.00%
After Five Years to Ten Years - Carrying Value	$ 570,403
After Five Years to Ten Years - Weighted- Average Yield	2.50%
After Ten Years - Carrying Value	$ 947,299
After Ten Years - Weighted- Average Yield	1.65%
Residential mortgage-backed securities | Agency-issued collateralized mortgage obligations | Variable rate
Investments Classified by Contractual Maturity Date [Line Items]
Available-for-sale Securities, Debt Securities	$ 645,288
Weighted- Average Yield	0.71%
One Year or Less - Carrying Value	$ 0
One Year or Less - Weighted- Average Yield	0.00%
After One Year to Five Years - Carrying Value	$ 0
After One Year to Five Years - Weighted- Average Yield	0.00%
After Five Years to Ten Years - Carrying Value	$ 0
After Five Years to Ten Years - Weighted- Average Yield	0.00%
After Ten Years - Carrying Value	$ 645,288
After Ten Years - Weighted- Average Yield	0.71%
Lower Limit
Investments Classified by Contractual Maturity Date [Line Items]
Mortgage-backed securities contractual maturities (in years)	10 years
Upper Limit
Investments Classified by Contractual Maturity Date [Line Items]
Mortgage-backed securities contractual maturities (in years)	30 years

Investment Securities - Summa56

Investment Securities - Summary of Unrealized Losses on Held to Maturity Securities (Details) $ in Thousands	Sep. 30, 2015USD ($)Investment	Dec. 31, 2014USD ($)Investment
Schedule of Held-to-maturity Securities [Line Items]
Amortized Cost	$ 8,306,526	$ 7,421,042
Unrealized Gains	68,056	16,314
Unrealized Losses	(7,579)	(21,700)
Fair Value	8,367,003	7,415,656
Held-to-maturity Securities, Continuous Unrealized Loss Position, Accumulated Loss [Abstract]
Fair Value of Investments, Less than 12 months	1,043,761	3,438,894
Unrealized Losses, Less than 12 months	(5,937)	(16,520)
Fair Value of Investments, 12 months or longer	107,562	783,558
Unrealized Losses, 12 months or longer	(1,642)	(5,180)
Fair Value of Investments	1,151,323	4,222,452
Unrealized Losses	$ (7,579)	$ (21,700)
Number of held-to-maturity investments with unrealized loss | Investment	157	292
Number of held-to-maturity investments in continuous loss more than 12 months | Investment	63	26
U.S. agency debentures
Schedule of Held-to-maturity Securities [Line Items]
Amortized Cost	$ 545,753	$ 405,899
Unrealized Gains	11,923	4,589
Unrealized Losses	0	(38)
Fair Value	557,676	410,450
Held-to-maturity Securities, Continuous Unrealized Loss Position, Accumulated Loss [Abstract]
Fair Value of Investments, Less than 12 months		48,335
Unrealized Losses, Less than 12 months		(38)
Fair Value of Investments, 12 months or longer		0
Unrealized Losses, 12 months or longer		0
Fair Value of Investments		48,335
Unrealized Losses		(38)
Agency-issued mortgage-backed securities
Schedule of Held-to-maturity Securities [Line Items]
Amortized Cost	2,457,328	2,799,923
Unrealized Gains	18,925	5,789
Unrealized Losses	(1,005)	(2,320)
Fair Value	2,475,248	2,803,392
Held-to-maturity Securities, Continuous Unrealized Loss Position, Accumulated Loss [Abstract]
Fair Value of Investments, Less than 12 months	308,687	999,230
Unrealized Losses, Less than 12 months	(438)	(2,320)
Fair Value of Investments, 12 months or longer	23,732	0
Unrealized Losses, 12 months or longer	(567)	0
Fair Value of Investments	332,419	999,230
Unrealized Losses	(1,005)	(2,320)
Residential mortgage-backed securities | Agency-issued collateralized mortgage obligations | Fixed rate
Schedule of Held-to-maturity Securities [Line Items]
Amortized Cost	4,045,172	3,185,109
Unrealized Gains	24,146	4,521
Unrealized Losses	(5,372)	(14,885)
Fair Value	4,063,946	3,174,745
Held-to-maturity Securities, Continuous Unrealized Loss Position, Accumulated Loss [Abstract]
Fair Value of Investments, Less than 12 months	705,362	1,682,348
Unrealized Losses, Less than 12 months	(5,264)	(9,705)
Fair Value of Investments, 12 months or longer	8,945	783,558
Unrealized Losses, 12 months or longer	(108)	(5,180)
Fair Value of Investments	714,307	2,465,906
Unrealized Losses	(5,372)	(14,885)
Residential mortgage-backed securities | Agency-issued collateralized mortgage obligations | Variable rate
Schedule of Held-to-maturity Securities [Line Items]
Amortized Cost	109,478	131,580
Unrealized Gains	577	371
Unrealized Losses	0	0
Fair Value	110,055	131,951
Agency-issued commercial mortgage-backed securities
Schedule of Held-to-maturity Securities [Line Items]
Amortized Cost	1,073,160	814,589
Unrealized Gains	12,449	1,026
Unrealized Losses	(309)	(3,800)
Fair Value	1,085,300	811,815
Held-to-maturity Securities, Continuous Unrealized Loss Position, Accumulated Loss [Abstract]
Fair Value of Investments, Less than 12 months	0	629,840
Unrealized Losses, Less than 12 months	0	(3,800)
Fair Value of Investments, 12 months or longer	42,179	0
Unrealized Losses, 12 months or longer	(309)	0
Fair Value of Investments	42,179	629,840
Unrealized Losses	(309)	(3,800)
Municipal bonds and notes
Schedule of Held-to-maturity Securities [Line Items]
Amortized Cost	75,635	83,942
Unrealized Gains	36	18
Unrealized Losses	(893)	(657)
Fair Value	74,778	83,303
Held-to-maturity Securities, Continuous Unrealized Loss Position, Accumulated Loss [Abstract]
Fair Value of Investments, Less than 12 months	29,712	79,141
Unrealized Losses, Less than 12 months	(235)	(657)
Fair Value of Investments, 12 months or longer	32,706	0
Unrealized Losses, 12 months or longer	(658)	0
Fair Value of Investments	62,418	79,141
Unrealized Losses	$ (893)	$ (657)

Investment Securities - Summa57

Investment Securities - Summary of Remaining Contractual Principal Maturities and Fully Taxable Equivalent Yields on Debt Securities Classified as Held to Maturity (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2015	Dec. 31, 2014
Schedule of Held-to-maturity Securities [Line Items]
Federal statutory tax rate	35.00%
Amortized Cost	$ 8,306,526	$ 7,421,042
Held-to-maturity securities
Schedule of Held-to-maturity Securities [Line Items]
Amortized Cost	$ 8,306,526
Weighted- Average Yield	2.06%
One Year or Less - Amortized Cost	$ 4,711
One Year or Less - Weighted- Average Yield	5.58%
One Year to Five Years - Amortized Cost	$ 68,610
After One Year to Five Years - Weighted- Average Yield	3.89%
After Five Years to Ten Years - Amortized Cost	$ 1,256,035
After Five Years to Ten Years - Weighted- Average Yield	2.53%
After Ten Years - Amortized Cost	$ 6,977,170
After Ten Years - Weighted- Average Yield	1.95%
Held-to-maturity securities | U.S. agency debentures
Schedule of Held-to-maturity Securities [Line Items]
Amortized Cost	$ 545,753
Weighted- Average Yield	2.69%
One Year or Less - Amortized Cost
One Year or Less - Weighted- Average Yield	0.00%
One Year to Five Years - Amortized Cost	$ 0
After One Year to Five Years - Weighted- Average Yield	0.00%
After Five Years to Ten Years - Amortized Cost	$ 545,753
After Five Years to Ten Years - Weighted- Average Yield	2.69%
After Ten Years - Amortized Cost	$ 0
After Ten Years - Weighted- Average Yield	0.00%
Held-to-maturity securities | Agency-issued mortgage-backed securities
Schedule of Held-to-maturity Securities [Line Items]
Amortized Cost	$ 2,457,328
Weighted- Average Yield	2.43%
One Year or Less - Amortized Cost	$ 0
One Year or Less - Weighted- Average Yield	0.00%
One Year to Five Years - Amortized Cost	$ 39,527
After One Year to Five Years - Weighted- Average Yield	2.38%
After Five Years to Ten Years - Amortized Cost	$ 674,584
After Five Years to Ten Years - Weighted- Average Yield	2.20%
After Ten Years - Amortized Cost	$ 1,743,217
After Ten Years - Weighted- Average Yield	2.52%
Held-to-maturity securities | Residential mortgage-backed securities | Agency-issued collateralized mortgage obligations | Fixed rate
Schedule of Held-to-maturity Securities [Line Items]
Amortized Cost	$ 4,045,172
Weighted- Average Yield	1.70%
One Year or Less - Amortized Cost	$ 0
One Year or Less - Weighted- Average Yield	0.00%
One Year to Five Years - Amortized Cost	$ 0
After One Year to Five Years - Weighted- Average Yield	0.00%
After Five Years to Ten Years - Amortized Cost	$ 0
After Five Years to Ten Years - Weighted- Average Yield	0.00%
After Ten Years - Amortized Cost	$ 4,045,172
After Ten Years - Weighted- Average Yield	1.70%
Held-to-maturity securities | Residential mortgage-backed securities | Agency-issued collateralized mortgage obligations | Variable rate
Schedule of Held-to-maturity Securities [Line Items]
Amortized Cost	$ 109,478
Weighted- Average Yield	0.65%
One Year or Less - Amortized Cost	$ 0
One Year or Less - Weighted- Average Yield	0.00%
One Year to Five Years - Amortized Cost	$ 0
After One Year to Five Years - Weighted- Average Yield	0.00%
After Five Years to Ten Years - Amortized Cost	$ 0
After Five Years to Ten Years - Weighted- Average Yield	0.00%
After Ten Years - Amortized Cost	$ 109,478
After Ten Years - Weighted- Average Yield	0.65%
Held-to-maturity securities | Agency-issued commercial mortgage-backed securities
Schedule of Held-to-maturity Securities [Line Items]
Amortized Cost	$ 1,073,160
Weighted- Average Yield	2.12%
One Year or Less - Amortized Cost	$ 0
One Year or Less - Weighted- Average Yield	0.00%
One Year to Five Years - Amortized Cost	$ 0
After One Year to Five Years - Weighted- Average Yield	0.00%
After Five Years to Ten Years - Amortized Cost	$ 0
After Five Years to Ten Years - Weighted- Average Yield	0.00%
After Ten Years - Amortized Cost	$ 1,073,160
After Ten Years - Weighted- Average Yield	2.12%
Held-to-maturity securities | Municipal bonds and notes
Schedule of Held-to-maturity Securities [Line Items]
Amortized Cost	$ 75,635
Weighted- Average Yield	6.05%
One Year or Less - Amortized Cost	$ 4,711
One Year or Less - Weighted- Average Yield	5.58%
One Year to Five Years - Amortized Cost	$ 29,083
After One Year to Five Years - Weighted- Average Yield	5.95%
After Five Years to Ten Years - Amortized Cost	$ 35,698
After Five Years to Ten Years - Weighted- Average Yield	6.14%
After Ten Years - Amortized Cost	$ 6,143
After Ten Years - Weighted- Average Yield	6.35%
Lower Limit | Held-to-maturity securities
Schedule of Held-to-maturity Securities [Line Items]
Mortgage-backed securities contractual maturities (in years)	10 years
Upper Limit | Held-to-maturity securities
Schedule of Held-to-maturity Securities [Line Items]
Mortgage-backed securities contractual maturities (in years)	30 years

Investment Securities - Non-mar

Investment Securities - Non-marketable and Other Securities (Detail) $ in Thousands		3 Months Ended		9 Months Ended		12 Months Ended
		Sep. 30, 2015USD ($)Investment	Sep. 30, 2014USD ($)	Sep. 30, 2015USD ($)Investment	Sep. 30, 2014USD ($)	Dec. 31, 2014USD ($)Investment	Sep. 30, 2014Investment
Investment Holdings [Line Items]
Total non-marketable and other securities	[1]	$ 650,555		$ 650,555		$ 1,728,140
Ownership interest percentage						5.00%
Upper Limit
Investment Holdings [Line Items]
Ownership interest percentage		5.00%		5.00%
Fair value accounting
Investment Holdings [Line Items]
Non-marketable securities, fair value accounting		$ 779		$ 779		$ 108,251
Venture capital and private equity fund investments
Investment Holdings [Line Items]
Non-marketable securities, equity method accounting		84,197		84,197
Venture capital and private equity fund investments | SVB Strategic Investors Fund II, LP
Investment Holdings [Line Items]
Non-marketable securities, equity method accounting		11,204		11,204
Venture capital and private equity fund investments | SVB Strategic Investors Fund III, LP
Investment Holdings [Line Items]
Non-marketable securities, equity method accounting		24,781		24,781
Venture capital and private equity fund investments | SVB Strategic Investors Fund IV, LP
Investment Holdings [Line Items]
Non-marketable securities, equity method accounting		25,542		25,542
Venture capital and private equity fund investments | Other investments
Investment Holdings [Line Items]
Non-marketable securities, equity method accounting		22,670		22,670
Venture capital and private equity fund investments | Fair value accounting
Investment Holdings [Line Items]
Non-marketable securities, fair value accounting		154,660		154,660		1,130,882
Non-marketable securities, cost method accounting		244,000		244,000		234,000
Venture capital and private equity fund investments | Fair value accounting | SVB Strategic Investors Fund, LP
Investment Holdings [Line Items]
Non-marketable securities, fair value accounting		23,229		$ 23,229		$ 24,645
Percentage of ownership				12.60%		12.60%
Venture capital and private equity fund investments | Fair value accounting | SVB Strategic Investors Fund II, LP
Investment Holdings [Line Items]
Non-marketable securities, fair value accounting		0		$ 0		$ 97,250
Percentage of ownership				8.60%		8.60%
Venture capital and private equity fund investments | Fair value accounting | SVB Strategic Investors Fund III, LP
Investment Holdings [Line Items]
Non-marketable securities, fair value accounting		0		$ 0		$ 269,821
Percentage of ownership				5.90%		5.90%
Venture capital and private equity fund investments | Fair value accounting | SVB Strategic Investors Fund IV, LP
Investment Holdings [Line Items]
Non-marketable securities, fair value accounting		0		$ 0		$ 291,291
Percentage of ownership				5.00%		5.00%
Venture capital and private equity fund investments | Fair value accounting | Strategic Investors Fund V Funds
Investment Holdings [Line Items]
Non-marketable securities, fair value accounting		0		$ 0		$ 226,111
Venture capital and private equity fund investments | Fair value accounting | Strategic Investors Fund VI Funds
Investment Holdings [Line Items]
Non-marketable securities, fair value accounting		0		0		$ 89,605
Percentage of ownership						0.00%
Venture capital and private equity fund investments | Fair value accounting | SVB Capital Preferred Return Fund, LP
Investment Holdings [Line Items]
Non-marketable securities, fair value accounting		61,869		$ 61,869		$ 62,110
Percentage of ownership				20.00%		20.00%
Venture capital and private equity fund investments | Fair value accounting | SVB Capital—NT Growth Partners, LP
Investment Holdings [Line Items]
Non-marketable securities, fair value accounting		62,818		$ 62,818		$ 61,973
Percentage of ownership				33.00%		33.00%
Venture capital and private equity fund investments | Fair value accounting | SVB Capital Partners II, LP
Investment Holdings [Line Items]
Non-marketable securities, fair value accounting		0		$ 0		$ 302
Percentage of ownership						5.10%
Venture capital and private equity fund investments | Fair value accounting | SVB Capital Partners II, LP | Direct ownership interest
Investment Holdings [Line Items]
Percentage of ownership				1.30%
Venture capital and private equity fund investments | Fair value accounting | SVB Capital Partners II, LP | Indirect ownership interest
Investment Holdings [Line Items]
Percentage of ownership				3.80%
Venture capital and private equity fund investments | Fair value accounting | Other private equity fund
Investment Holdings [Line Items]
Non-marketable securities, fair value accounting		6,744		$ 6,744		$ 7,774
Percentage of ownership				58.20%		58.20%
Venture capital and private equity fund investments | Fair value accounting | Other private equity fund | Direct ownership interest
Investment Holdings [Line Items]
Percentage of ownership				41.50%
Venture capital and private equity fund investments | Equity method accounting
Investment Holdings [Line Items]
Non-marketable securities, equity method accounting		84,197		$ 84,197		$ 0
Venture capital and private equity fund investments | Cost method accounting
Investment Holdings [Line Items]
Non-marketable securities, cost method accounting		$ 123,550		$ 123,550		$ 140,551
Number of investments		270	281	270	281	281	281
Other venture capital investments | Fair value accounting
Investment Holdings [Line Items]
Non-marketable securities, fair value accounting		$ 3,390		$ 3,390		$ 71,204
Other venture capital investments | Fair value accounting | SVB Capital Partners II, LP
Investment Holdings [Line Items]
Non-marketable securities, fair value accounting		0		$ 0		$ 20,481
Percentage of ownership				0.00%		5.10%
Other venture capital investments | Fair value accounting | Silicon Valley BancVentures, LP
Investment Holdings [Line Items]
Non-marketable securities, fair value accounting		3,390		$ 3,390		$ 3,291
Percentage of ownership				10.70%		10.70%
Other venture capital investments | Fair value accounting | Capital Partners III, LP
Investment Holdings [Line Items]
Non-marketable securities, fair value accounting		0		$ 0		$ 41,055
Percentage of ownership				0.00%		0.00%
Other venture capital investments | Fair value accounting | SVB Capital Shanghai Yangpu Venture Capital Fund
Investment Holdings [Line Items]
Non-marketable securities, fair value accounting		0		$ 0		$ 6,377
Percentage of ownership						6.80%
Debt funds | Equity method accounting
Investment Holdings [Line Items]
Non-marketable securities, equity method accounting		21,217		21,217		$ 26,672
Debt funds | Equity method accounting | Gold Hill Capital 2008, LP
Investment Holdings [Line Items]
Non-marketable securities, equity method accounting		17,662		$ 17,662		$ 21,294
Percentage of ownership				15.50%		15.50%
Debt funds | Equity method accounting | Other investments
Investment Holdings [Line Items]
Non-marketable securities, equity method accounting		3,555		$ 3,555		$ 5,378
Other investments | Fair value accounting | SVB Capital Preferred Return Fund, LP | Indirect ownership interest
Investment Holdings [Line Items]
Percentage of ownership				4.10%
Other investments | Fair value accounting | SVB Capital—NT Growth Partners, LP | Indirect ownership interest
Investment Holdings [Line Items]
Percentage of ownership				12.60%
Other investments | Fair value accounting | Other private equity fund | Direct ownership interest
Investment Holdings [Line Items]
Percentage of ownership				41.50%
Other investments | Equity method accounting
Investment Holdings [Line Items]
Non-marketable securities, equity method accounting		119,731		$ 119,731		116,002
Other investments | Equity method accounting | Gold Hill Capital 2008, LP | Direct ownership interest
Investment Holdings [Line Items]
Percentage of ownership				11.50%
Other investments | Equity method accounting | Gold Hill Capital 2008, LP | Indirect ownership interest
Investment Holdings [Line Items]
Percentage of ownership				4.00%
Other investments | Equity method accounting | China Joint Venture investment
Investment Holdings [Line Items]
Non-marketable securities, equity method accounting		79,299		$ 79,299		$ 79,569
Percentage of ownership				50.00%		50.00%
Other investments | Equity method accounting | Other investments
Investment Holdings [Line Items]
Non-marketable securities, equity method accounting		40,432		$ 40,432		$ 36,433
Other investments | Cost method accounting
Investment Holdings [Line Items]
Non-marketable securities, cost method accounting		17,499		17,499		13,423
Low Income Housing Tax Credit Funds
Investment Holdings [Line Items]
Nonmarketable securities, other		125,532		125,532		121,155
Tax credits and other tax benefits recognized		4,780	$ 3,087	11,207	$ 9,312
Amortization expense included in provision for income taxes		2,011	$ 1,246	7,549	$ 5,971
Unfunded commitments
Investment Holdings [Line Items]
Accrued expenses and other liabilities		$ 65,305		$ 65,305		$ 65,921
[1]	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 1— "Basis of Presentation" of the "Notes to Interim Consolidated Financial Statements" under Part I, Item 1 in this report.

Investment Securities - Compone

Investment Securities - Components of Gains and Losses (Realized and Unrealized) on Investment Securities (Detail) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015USD ($)Investment	Sep. 30, 2014USD ($)Investment	Sep. 30, 2015USD ($)Investment		Sep. 30, 2014USD ($)Investment	Dec. 31, 2014Investment	Sep. 30, 2014Investment
Gain (Loss) on Investments [Line Items]
Gross gains on investment securities	$ 21,787	$ 86,211	$ 85,046		$ 438,344
Gross losses on investment securities	(3,019)	(80,567)	(8,040)		(266,108)
(Losses) gains on investment securities, net	18,768	5,644	77,006	[1]	172,236
Cost method accounting | Venture capital and private equity fund investments
Gain (Loss) on Investments [Line Items]
Recognized other-than-temporary impairment (OTTI) losses	$ 100	$ 300	$ 400		$ 700
Number of other-than-temporary impaired investments | Investment	4	5	19		22
Number of investments	270	281	270		281	281	281
Available-for-sale Securities
Gain (Loss) on Investments [Line Items]
Gross gains on investment securities	$ 46	$ 45	$ 2,971		$ 642
Gross losses on investment securities	(33)	(1,035)	(221)		(18,052)
Non-marketable securities | Fair value accounting | Venture capital and private equity fund investments
Gain (Loss) on Investments [Line Items]
Gross gains on investment securities	6,746	69,044	24,767		268,483
Gross losses on investment securities	(1,148)	(25,584)	(2,695)		(76,243)
Non-marketable securities | Fair value accounting | Other venture capital investments
Gain (Loss) on Investments [Line Items]
Gross gains on investment securities	15	6,779	198		11,334
Gross losses on investment securities	0	(1,233)	(52)		(3,274)
Non-marketable securities | Fair value accounting | Other securities
Gain (Loss) on Investments [Line Items]
Gross gains on investment securities	40	5,444	9,108		136,010
Gross losses on investment securities	(325)	(52,264)	(1,117)		(166,051)
Non-marketable securities | Equity method accounting | Venture capital and private equity fund investments
Gain (Loss) on Investments [Line Items]
Gross gains on investment securities	7,655	275	22,111		1,284
Gross losses on investment securities	(914)	(115)	(1,351)		(231)
Non-marketable securities | Equity method accounting | Debt funds
Gain (Loss) on Investments [Line Items]
Gross gains on investment securities	379	1,037	2,067		4,076
Gross losses on investment securities	(1)	(64)	(589)		(457)
Non-marketable securities | Equity method accounting | Other investments
Gain (Loss) on Investments [Line Items]
Gross gains on investment securities	1,282	927	2,147		3,635
Gross losses on investment securities	(460)	0	(1,470)		(759)
Non-marketable securities | Cost method accounting | Venture capital and private equity fund investments
Gain (Loss) on Investments [Line Items]
Gross gains on investment securities	5,624	2,641	21,101		7,706
Gross losses on investment securities	(132)	(272)	(530)		(781)
Non-marketable securities | Cost method accounting | Other investments
Gain (Loss) on Investments [Line Items]
Gross gains on investment securities	0	19	576		5,174
Gross losses on investment securities	$ (6)	$ 0	$ (15)		$ (260)
[1]	Amounts for the nine months ended September 30, 2015, have been revised to reflect the retrospective application of new accounting guidance adopted in the second quarter of 2015 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 1— "Basis of Presentation” of the “Notes to Interim Consolidated Financial Statements (unaudited)” under Part I, Item 1 of this report for additional details.

Loans and Allowance for Loan 60

Loans and Allowance for Loan Losses - Composition of Loans, Net of Unearned Income (Detail) - USD ($) $ in Thousands	Sep. 30, 2015	Dec. 31, 2014
Accounts, Notes, Loans and Financing Receivable [Line Items]
Unearned income on loans	$ 115,000	$ 104,000
Loans, net of unearned income	15,314,580	14,384,276
Commercial Portfolio Segment
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, net of unearned income	12,893,846	12,380,611
Commercial Portfolio Segment | Software and internet
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, net of unearned income	5,272,825	4,954,676
Commercial Portfolio Segment | Hardware
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, net of unearned income	962,295	1,131,006
Commercial Portfolio Segment | Private equity/venture capital
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, net of unearned income	4,571,102	4,582,906
Commercial Portfolio Segment | Life science & healthcare
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, net of unearned income	1,598,362	1,289,904
Commercial Portfolio Segment | Premium wine
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, net of unearned income	193,712	187,568
Commercial Portfolio Segment | Other consumer loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, net of unearned income	295,550	234,551
Commercial Real Estate Portfolio Segment
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, net of unearned income	2,115,358	1,764,519
Commercial Real Estate Portfolio Segment | Premium wine
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, net of unearned income	633,248	606,753
Commercial Real Estate Portfolio Segment | Real estate secured loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, net of unearned income	1,444,067	1,118,115
Commercial Real Estate Portfolio Segment | Other real estate loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, net of unearned income	38,043	39,651
Construction Portfolio Segment
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, net of unearned income	92,551	78,626
Consumer Portfolio Segment
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, net of unearned income	1,656,892	1,278,635
Consumer Portfolio Segment | Real estate secured loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, net of unearned income	1,444,067	1,118,115
Consumer Portfolio Segment | Other consumer loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, net of unearned income	$ 212,825	$ 160,520

Loans and Allowance for Loan 61

Loans and Allowance for Loan Losses - Composition of Loans, Net of Unearned income (Additional Information) (Detail) - USD ($) $ in Thousands	Sep. 30, 2015	Dec. 31, 2014
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, net of unearned income	$ 15,314,580	$ 14,384,276
Credit card loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loan portfolio	186,000	131,000
Premium wine
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross construction loans	119,000	112,000
Consumer Portfolio Segment
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, net of unearned income	1,656,892	1,278,635
Consumer Portfolio Segment | Real estate secured loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, net of unearned income	1,444,067	1,118,115
Consumer Portfolio Segment | Real estate secured loans | Loans for personal residence
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, net of unearned income	1,225,794	918,629
Consumer Portfolio Segment | Real estate secured loans | Loans to eligible employees
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, net of unearned income	149,612	133,568
Consumer Portfolio Segment | Real estate secured loans | Home equity lines of credit
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, net of unearned income	$ 68,661	$ 65,918

Loans and Allowance for Loan 62

Loans and Allowance for Loan Losses - Composition of Loans, Net of Unearned Income, Broken Out by Portfolio Segment and Class of Financing Receivable (Detail) - USD ($) $ in Thousands	Sep. 30, 2015	Dec. 31, 2014
Financing Receivable, Recorded Investment [Line Items]
Loans, net of unearned income	$ 15,314,580	$ 14,384,276
Commercial and Commercial Real Estate Portfolio Segment
Financing Receivable, Recorded Investment [Line Items]
Loans, net of unearned income	13,657,688	13,105,641
Commercial and Commercial Real Estate Portfolio Segment | Software and internet
Financing Receivable, Recorded Investment [Line Items]
Loans, net of unearned income	5,272,825	4,954,676
Commercial and Commercial Real Estate Portfolio Segment | Hardware
Financing Receivable, Recorded Investment [Line Items]
Loans, net of unearned income	962,295	1,131,006
Commercial and Commercial Real Estate Portfolio Segment | Private equity/venture capital
Financing Receivable, Recorded Investment [Line Items]
Loans, net of unearned income	4,571,102	4,582,906
Commercial and Commercial Real Estate Portfolio Segment | Life science & healthcare
Financing Receivable, Recorded Investment [Line Items]
Loans, net of unearned income	1,598,362	1,289,904
Commercial and Commercial Real Estate Portfolio Segment | Premium wine
Financing Receivable, Recorded Investment [Line Items]
Loans, net of unearned income	826,960	794,321
Commercial and Commercial Real Estate Portfolio Segment | Other
Financing Receivable, Recorded Investment [Line Items]
Loans, net of unearned income	426,144	352,828
Consumer Portfolio Segment
Financing Receivable, Recorded Investment [Line Items]
Loans, net of unearned income	1,656,892	1,278,635
Consumer Portfolio Segment | Other
Financing Receivable, Recorded Investment [Line Items]
Loans, net of unearned income	212,825	160,520
Consumer Portfolio Segment | Real estate secured loans
Financing Receivable, Recorded Investment [Line Items]
Loans, net of unearned income	$ 1,444,067	$ 1,118,115

Loans and Allowance for Loan 63

Loans and Allowance for Loan Losses - Aging of Gross Loans, Broken out by Portfolio Segment and Class of Financing Receivable (Detail) - USD ($) $ in Thousands	Sep. 30, 2015	Dec. 31, 2014
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Past Due	$ 25,932	$ 96,090
Current	15,404,009	14,392,676
Loans Past Due 90 Days or More Still Accruing Interest	169	1,302
Total gross loans excluding impaired loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Past Due	15,839	71,879
Current	15,298,641	14,378,750
Loans Past Due 90 Days or More Still Accruing Interest	169	1,302
Impaired loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Past Due	10,093	24,211
Current	105,368	13,926
Loans Past Due 90 Days or More Still Accruing Interest	0	0
30 - 59 Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Past Due	12,744	68,292
30 - 59 Days Past Due | Total gross loans excluding impaired loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Past Due	12,744	67,694
30 - 59 Days Past Due | Impaired loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Past Due	0	598
60 - 89 Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Past Due	4,724	4,176
60 - 89 Days Past Due | Total gross loans excluding impaired loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Past Due	2,926	2,883
60 - 89 Days Past Due | Impaired loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Past Due	1,798	1,293
Greater Than 90 Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Past Due	8,464	23,622
Greater Than 90 Days Past Due | Total gross loans excluding impaired loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Past Due	169	1,302
Greater Than 90 Days Past Due | Impaired loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Past Due	8,295	22,320
Commercial Portfolio Segment | Software and internet
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Past Due	11,066	12,668
Current	5,244,198	4,950,291
Loans Past Due 90 Days or More Still Accruing Interest	169	52
Commercial Portfolio Segment | Hardware
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Past Due	1,641	13,550
Current	965,511	1,124,423
Loans Past Due 90 Days or More Still Accruing Interest	0	0
Commercial Portfolio Segment | Private equity/venture capital
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Past Due	410	40,773
Current	4,611,543	4,580,526
Loans Past Due 90 Days or More Still Accruing Interest	0	0
Commercial Portfolio Segment | Life science & healthcare
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Past Due	1,106	1,524
Current	1,566,185	1,298,728
Loans Past Due 90 Days or More Still Accruing Interest	0	0
Commercial Portfolio Segment | Premium wine
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Past Due	295	0
Current	827,709	795,345
Loans Past Due 90 Days or More Still Accruing Interest	0	0
Commercial Portfolio Segment | Other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Past Due	8	181
Current	429,145	354,939
Loans Past Due 90 Days or More Still Accruing Interest	0	0
Commercial Portfolio Segment | Commercial loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Past Due	14,526	68,696
Current	13,644,291	13,104,252
Loans Past Due 90 Days or More Still Accruing Interest	169	52
Commercial Portfolio Segment | 30 - 59 Days Past Due | Software and internet
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Past Due	9,729	10,989
Commercial Portfolio Segment | 30 - 59 Days Past Due | Hardware
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Past Due	620	13,424
Commercial Portfolio Segment | 30 - 59 Days Past Due | Private equity/venture capital
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Past Due	410	40,773
Commercial Portfolio Segment | 30 - 59 Days Past Due | Life science & healthcare
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Past Due	377	738
Commercial Portfolio Segment | 30 - 59 Days Past Due | Premium wine
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Past Due	295	0
Commercial Portfolio Segment | 30 - 59 Days Past Due | Other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Past Due	0	178
Commercial Portfolio Segment | 30 - 59 Days Past Due | Commercial loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Past Due	11,431	66,102
Commercial Portfolio Segment | 60 - 89 Days Past Due | Software and internet
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Past Due	1,168	1,627
Commercial Portfolio Segment | 60 - 89 Days Past Due | Hardware
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Past Due	1,021	126
Commercial Portfolio Segment | 60 - 89 Days Past Due | Private equity/venture capital
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Past Due	0	0
Commercial Portfolio Segment | 60 - 89 Days Past Due | Life science & healthcare
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Past Due	729	786
Commercial Portfolio Segment | 60 - 89 Days Past Due | Premium wine
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Past Due	0	0
Commercial Portfolio Segment | 60 - 89 Days Past Due | Other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Past Due	8	3
Commercial Portfolio Segment | 60 - 89 Days Past Due | Commercial loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Past Due	2,926	2,542
Commercial Portfolio Segment | Greater Than 90 Days Past Due | Software and internet
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Past Due	169	52
Commercial Portfolio Segment | Greater Than 90 Days Past Due | Hardware
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Past Due	0	0
Commercial Portfolio Segment | Greater Than 90 Days Past Due | Private equity/venture capital
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Past Due	0	0
Commercial Portfolio Segment | Greater Than 90 Days Past Due | Life science & healthcare
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Past Due	0	0
Commercial Portfolio Segment | Greater Than 90 Days Past Due | Premium wine
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Past Due	0	0
Commercial Portfolio Segment | Greater Than 90 Days Past Due | Other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Past Due	0	0
Commercial Portfolio Segment | Greater Than 90 Days Past Due | Commercial loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Past Due	169	52
Consumer Portfolio Segment | Real estate secured loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Past Due	0	3,183
Current	1,443,011	1,114,286
Loans Past Due 90 Days or More Still Accruing Interest	0	1,250
Consumer Portfolio Segment | Other consumer loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Past Due	1,313	0
Current	211,339	160,212
Loans Past Due 90 Days or More Still Accruing Interest	0	0
Consumer Portfolio Segment | Consumer loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Past Due	1,313	3,183
Current	1,654,350	1,274,498
Loans Past Due 90 Days or More Still Accruing Interest	0	1,250
Consumer Portfolio Segment | 30 - 59 Days Past Due | Real estate secured loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Past Due	0	1,592
Consumer Portfolio Segment | 30 - 59 Days Past Due | Other consumer loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Past Due	1,313	0
Consumer Portfolio Segment | 30 - 59 Days Past Due | Consumer loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Past Due	1,313	1,592
Consumer Portfolio Segment | 60 - 89 Days Past Due | Real estate secured loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Past Due	0	341
Consumer Portfolio Segment | 60 - 89 Days Past Due | Other consumer loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Past Due	0	0
Consumer Portfolio Segment | 60 - 89 Days Past Due | Consumer loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Past Due	0	341
Consumer Portfolio Segment | Greater Than 90 Days Past Due | Real estate secured loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Past Due	0	1,250
Consumer Portfolio Segment | Greater Than 90 Days Past Due | Other consumer loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Past Due	0	0
Consumer Portfolio Segment | Greater Than 90 Days Past Due | Consumer loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Past Due	$ 0	$ 1,250

Loans and Allowance for Loan 64

Loans and Allowance for Loan Losses - Impaired Loans and Allowance for Loan Losses, Broken out by Portfolio Segment and Class of Financing Receivable (Detail) - USD ($) $ in Thousands	Sep. 30, 2015	Dec. 31, 2014
Financing Receivable, Impaired [Line Items]
Carrying value of impaired loans	$ 115,461	$ 38,137
Total unpaid principal of impaired loans	142,449	42,899
Impaired loans for which there is a related allowance for loan losses
Financing Receivable, Impaired [Line Items]
Carrying value of impaired loans	113,924	35,523
Impaired loans for which there is no related allowance for loan losses
Financing Receivable, Impaired [Line Items]
Carrying value of impaired loans	1,537	2,614
Commercial Portfolio Segment | Software and internet
Financing Receivable, Impaired [Line Items]
Carrying value of impaired loans	64,792	33,287
Total unpaid principal of impaired loans	89,471	34,218
Commercial Portfolio Segment | Hardware
Financing Receivable, Impaired [Line Items]
Carrying value of impaired loans	3,763	2,521
Total unpaid principal of impaired loans	3,802	2,535
Commercial Portfolio Segment | Private equity/venture capital
Financing Receivable, Impaired [Line Items]
Carrying value of impaired loans	0	0
Total unpaid principal of impaired loans	0	0
Commercial Portfolio Segment | Life science & healthcare
Financing Receivable, Impaired [Line Items]
Carrying value of impaired loans	45,389	475
Total unpaid principal of impaired loans	45,904	2,453
Commercial Portfolio Segment | Premium wine
Financing Receivable, Impaired [Line Items]
Carrying value of impaired loans	1,201	1,304
Total unpaid principal of impaired loans	1,716	1,743
Commercial Portfolio Segment | Commercial loans
Financing Receivable, Impaired [Line Items]
Carrying value of impaired loans	115,302	37,820
Total unpaid principal of impaired loans	141,050	41,182
Commercial Portfolio Segment | Other
Financing Receivable, Impaired [Line Items]
Carrying value of impaired loans	157	233
Total unpaid principal of impaired loans	157	233
Commercial Portfolio Segment | Impaired loans for which there is a related allowance for loan losses | Software and internet
Financing Receivable, Impaired [Line Items]
Carrying value of impaired loans	64,792	33,287
Commercial Portfolio Segment | Impaired loans for which there is a related allowance for loan losses | Hardware
Financing Receivable, Impaired [Line Items]
Carrying value of impaired loans	3,586	1,403
Commercial Portfolio Segment | Impaired loans for which there is a related allowance for loan losses | Private equity/venture capital
Financing Receivable, Impaired [Line Items]
Carrying value of impaired loans	0	0
Commercial Portfolio Segment | Impaired loans for which there is a related allowance for loan losses | Life science & healthcare
Financing Receivable, Impaired [Line Items]
Carrying value of impaired loans	45,389	475
Commercial Portfolio Segment | Impaired loans for which there is a related allowance for loan losses | Premium wine
Financing Receivable, Impaired [Line Items]
Carrying value of impaired loans	0	0
Commercial Portfolio Segment | Impaired loans for which there is a related allowance for loan losses | Commercial loans
Financing Receivable, Impaired [Line Items]
Carrying value of impaired loans	113,924	35,398
Commercial Portfolio Segment | Impaired loans for which there is a related allowance for loan losses | Other
Financing Receivable, Impaired [Line Items]
Carrying value of impaired loans	157	233
Commercial Portfolio Segment | Impaired loans for which there is no related allowance for loan losses | Software and internet
Financing Receivable, Impaired [Line Items]
Carrying value of impaired loans	0	0
Commercial Portfolio Segment | Impaired loans for which there is no related allowance for loan losses | Hardware
Financing Receivable, Impaired [Line Items]
Carrying value of impaired loans	177	1,118
Commercial Portfolio Segment | Impaired loans for which there is no related allowance for loan losses | Private equity/venture capital
Financing Receivable, Impaired [Line Items]
Carrying value of impaired loans	0	0
Commercial Portfolio Segment | Impaired loans for which there is no related allowance for loan losses | Life science & healthcare
Financing Receivable, Impaired [Line Items]
Carrying value of impaired loans	0	0
Commercial Portfolio Segment | Impaired loans for which there is no related allowance for loan losses | Premium wine
Financing Receivable, Impaired [Line Items]
Carrying value of impaired loans	1,201	1,304
Commercial Portfolio Segment | Impaired loans for which there is no related allowance for loan losses | Commercial loans
Financing Receivable, Impaired [Line Items]
Carrying value of impaired loans	1,378	2,422
Commercial Portfolio Segment | Impaired loans for which there is no related allowance for loan losses | Other
Financing Receivable, Impaired [Line Items]
Carrying value of impaired loans	0	0
Consumer Portfolio Segment | Real estate secured loans
Financing Receivable, Impaired [Line Items]
Carrying value of impaired loans	159	192
Total unpaid principal of impaired loans	1,399	1,412
Consumer Portfolio Segment | Other consumer loans
Financing Receivable, Impaired [Line Items]
Carrying value of impaired loans	0	125
Total unpaid principal of impaired loans	0	305
Consumer Portfolio Segment | Consumer loans
Financing Receivable, Impaired [Line Items]
Carrying value of impaired loans	159	317
Total unpaid principal of impaired loans	1,399	1,717
Consumer Portfolio Segment | Impaired loans for which there is a related allowance for loan losses | Real estate secured loans
Financing Receivable, Impaired [Line Items]
Carrying value of impaired loans	0	0
Consumer Portfolio Segment | Impaired loans for which there is a related allowance for loan losses | Other consumer loans
Financing Receivable, Impaired [Line Items]
Carrying value of impaired loans	0	125
Consumer Portfolio Segment | Impaired loans for which there is a related allowance for loan losses | Consumer loans
Financing Receivable, Impaired [Line Items]
Carrying value of impaired loans	0	125
Consumer Portfolio Segment | Impaired loans for which there is no related allowance for loan losses | Real estate secured loans
Financing Receivable, Impaired [Line Items]
Carrying value of impaired loans	159	192
Consumer Portfolio Segment | Impaired loans for which there is no related allowance for loan losses | Other consumer loans
Financing Receivable, Impaired [Line Items]
Carrying value of impaired loans	0	0
Consumer Portfolio Segment | Impaired loans for which there is no related allowance for loan losses | Consumer loans
Financing Receivable, Impaired [Line Items]
Carrying value of impaired loans	$ 159	$ 192

Loans and Allowance for Loan 65

Loans and Allowance for Loan Losses - Average Impaired Loans, Broken out by Portfolio Segment and Class of Financing Receivable (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Financing Receivable, Impaired [Line Items]
Average impaired loans	$ 101,643	$ 15,035	$ 67,991	$ 25,846
Commercial Portfolio Segment | Software and internet
Financing Receivable, Impaired [Line Items]
Average impaired loans	77,156	10,651	54,543	13,690
Commercial Portfolio Segment | Hardware
Financing Receivable, Impaired [Line Items]
Average impaired loans	2,796	1,540	1,944	8,140
Commercial Portfolio Segment | Life science & healthcare
Financing Receivable, Impaired [Line Items]
Average impaired loans	17,184	333	6,526	636
Commercial Portfolio Segment | Premium wine
Financing Receivable, Impaired [Line Items]
Average impaired loans	1,213	1,364	1,245	1,398
Commercial Portfolio Segment | Other
Financing Receivable, Impaired [Line Items]
Average impaired loans	3,132	674	3,498	1,383
Commercial Portfolio Segment | Commercial loans
Financing Receivable, Impaired [Line Items]
Average impaired loans	101,481	14,562	67,756	25,247
Consumer Portfolio Segment | Real estate secured loans
Financing Receivable, Impaired [Line Items]
Average impaired loans	162	212	180	224
Consumer Portfolio Segment | Other consumer loans
Financing Receivable, Impaired [Line Items]
Average impaired loans	0	261	55	375
Consumer Portfolio Segment | Consumer loans
Financing Receivable, Impaired [Line Items]
Average impaired loans	$ 162	$ 473	$ 235	$ 599

Loans and Allowance for Loan 66

Loans and Allowance for Loan Losses - Activity in Allowance for Loan Losses Broken out by Portfolio Segment (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015		Sep. 30, 2014
Allowance for Loan and Lease Losses [Roll Forward]
Beginning Balance	$ 192,644	$ 120,728	$ 165,359		$ 142,886
Charge-offs	(29,118)	(10,657)	(39,339)		(38,189)
Recoveries	578	2,380	5,119		5,313
Provision for loan losses	33,403	16,610	66,368	[1]	19,051
Ending Balance	197,507	129,061	197,507		129,061
Commercial Portfolio Segment | Software and internet
Allowance for Loan and Lease Losses [Roll Forward]
Beginning Balance	106,728	53,239	80,981		64,084
Charge-offs	(24,815)	(6,907)	(26,980)		(18,932)
Recoveries	195	790	1,239		1,023
Provision for loan losses	5,958	11,078	32,826		12,025
Ending Balance	88,066	58,200	88,066		58,200
Commercial Portfolio Segment | Hardware
Allowance for Loan and Lease Losses [Roll Forward]
Beginning Balance	20,472	24,780	25,860		36,553
Charge-offs	0	(2,643)	(4,049)		(15,230)
Recoveries	240	113	3,049		2,070
Provision for loan losses	(70)	2,491	(4,218)		1,348
Ending Balance	20,642	24,741	20,642		24,741
Commercial Portfolio Segment | Private equity/venture capital
Allowance for Loan and Lease Losses [Roll Forward]
Beginning Balance	29,276	19,004	27,997		16,385
Charge-offs	0	0	0		0
Recoveries	0	0	0		0
Provision for loan losses	3,166	845	4,445		3,464
Ending Balance	32,442	19,849	32,442		19,849
Commercial Portfolio Segment | Life science & healthcare
Allowance for Loan and Lease Losses [Roll Forward]
Beginning Balance	17,233	10,597	15,208		11,926
Charge-offs	(117)	0	(3,336)		(930)
Recoveries	50	53	129		341
Provision for loan losses	19,793	1,591	24,958		904
Ending Balance	36,959	12,241	36,959		12,241
Commercial Portfolio Segment | Premium wine
Allowance for Loan and Lease Losses [Roll Forward]
Beginning Balance	4,409	3,546	4,473		3,914
Charge-offs	0	(35)	0		(35)
Recoveries	0	0	7		238
Provision for loan losses	253	710	182		104
Ending Balance	4,662	4,221	4,662		4,221
Commercial Portfolio Segment | Other
Allowance for Loan and Lease Losses [Roll Forward]
Beginning Balance	5,894	3,218	3,253		3,680
Charge-offs	(4,186)	(1,072)	(4,974)		(3,062)
Recoveries	89	1,306	559		1,316
Provision for loan losses	2,976	(530)	5,935		988
Ending Balance	4,773	2,922	4,773		2,922
Commercial Portfolio Segment | Commercial loans
Allowance for Loan and Lease Losses [Roll Forward]
Beginning Balance	184,012	114,384	157,772		136,542
Charge-offs	(29,118)	(10,657)	(39,339)		(38,189)
Recoveries	574	2,262	4,983		4,988
Provision for loan losses	32,076	16,185	64,128		18,833
Ending Balance	187,544	122,174	187,544		122,174
Consumer Portfolio Segment | Consumer loans
Allowance for Loan and Lease Losses [Roll Forward]
Beginning Balance	8,632	6,344	7,587		6,344
Charge-offs	0	0	0		0
Recoveries	4	118	136		325
Provision for loan losses	1,327	425	2,240		218
Ending Balance	$ 9,963	$ 6,887	$ 9,963		$ 6,887
[1]	Amounts for the nine months ended September 30, 2015, have been revised to reflect the retrospective application of new accounting guidance adopted in the second quarter of 2015 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 1— "Basis of Presentation” of the “Notes to Interim Consolidated Financial Statements (unaudited)” under Part I, Item 1 of this report for additional details.

Loans and Allowance for Loan 67

Loans and Allowance for Loan Losses - Allowance for Loan Losses Individually and Collectively Evaluated for Impairment (Detail) - USD ($) $ in Thousands	Sep. 30, 2015	Dec. 31, 2014
Financing Receivable, Impaired [Line Items]
Individually Evaluated for Impairment, Allowance for loan losses	$ 46,256	$ 15,051
Individually Evaluated for Impairment, Recorded investment in loans	115,461	38,137
Collectively Evaluated for Impairment, Allowance for loan losses	151,251	150,308
Collectively Evaluated for Impairment, Allowance for loan losses	15,199,119	14,346,139
Commercial Portfolio Segment | Software and internet
Financing Receivable, Impaired [Line Items]
Individually Evaluated for Impairment, Allowance for loan losses	25,260	13,695
Individually Evaluated for Impairment, Recorded investment in loans	64,792	33,287
Collectively Evaluated for Impairment, Allowance for loan losses	62,806	67,286
Collectively Evaluated for Impairment, Allowance for loan losses	5,208,033	4,921,389
Commercial Portfolio Segment | Hardware
Financing Receivable, Impaired [Line Items]
Individually Evaluated for Impairment, Allowance for loan losses	1,100	1,133
Individually Evaluated for Impairment, Recorded investment in loans	3,763	2,521
Collectively Evaluated for Impairment, Allowance for loan losses	19,542	24,727
Collectively Evaluated for Impairment, Allowance for loan losses	958,532	1,128,485
Commercial Portfolio Segment | Private equity/venture capital
Financing Receivable, Impaired [Line Items]
Individually Evaluated for Impairment, Allowance for loan losses	0	0
Individually Evaluated for Impairment, Recorded investment in loans	0	0
Collectively Evaluated for Impairment, Allowance for loan losses	32,442	27,997
Collectively Evaluated for Impairment, Allowance for loan losses	4,571,102	4,582,906
Commercial Portfolio Segment | Life science & healthcare
Financing Receivable, Impaired [Line Items]
Individually Evaluated for Impairment, Allowance for loan losses	19,739	121
Individually Evaluated for Impairment, Recorded investment in loans	45,389	475
Collectively Evaluated for Impairment, Allowance for loan losses	17,220	15,087
Collectively Evaluated for Impairment, Allowance for loan losses	1,552,973	1,289,429
Commercial Portfolio Segment | Premium wine
Financing Receivable, Impaired [Line Items]
Individually Evaluated for Impairment, Allowance for loan losses	0	0
Individually Evaluated for Impairment, Recorded investment in loans	1,201	1,304
Collectively Evaluated for Impairment, Allowance for loan losses	4,662	4,473
Collectively Evaluated for Impairment, Allowance for loan losses	825,759	793,017
Commercial Portfolio Segment | Other
Financing Receivable, Impaired [Line Items]
Individually Evaluated for Impairment, Allowance for loan losses	157	71
Individually Evaluated for Impairment, Recorded investment in loans	157	233
Collectively Evaluated for Impairment, Allowance for loan losses	4,616	3,182
Collectively Evaluated for Impairment, Allowance for loan losses	425,987	352,595
Commercial Portfolio Segment | Commercial loans
Financing Receivable, Impaired [Line Items]
Individually Evaluated for Impairment, Allowance for loan losses	46,256	15,020
Individually Evaluated for Impairment, Recorded investment in loans	115,302	37,820
Collectively Evaluated for Impairment, Allowance for loan losses	141,288	142,752
Collectively Evaluated for Impairment, Allowance for loan losses	13,542,386	13,067,821
Consumer Portfolio Segment | Consumer loans
Financing Receivable, Impaired [Line Items]
Individually Evaluated for Impairment, Allowance for loan losses	0	31
Individually Evaluated for Impairment, Recorded investment in loans	159	317
Collectively Evaluated for Impairment, Allowance for loan losses	9,963	7,556
Collectively Evaluated for Impairment, Allowance for loan losses	$ 1,656,733	$ 1,278,318

Loans and Allowance for Loan 68

Loans and Allowance for Loan Losses - Credit Quality Indicators, Broken out by Portfolio Segment and Class of Financing Receivables (Detail) - USD ($) $ in Thousands	Sep. 30, 2015	Dec. 31, 2014
Financing Receivable, Recorded Investment [Line Items]
Financing receivable	$ 15,429,941	$ 14,488,766
Pass
Financing Receivable, Recorded Investment [Line Items]
Financing receivable	14,562,676	13,729,421
Performing (Criticized)
Financing Receivable, Recorded Investment [Line Items]
Financing receivable	751,804	721,208
Impaired
Financing Receivable, Recorded Investment [Line Items]
Financing receivable	115,461	38,137
Commercial Portfolio Segment | Software and internet
Financing Receivable, Recorded Investment [Line Items]
Financing receivable	5,320,056	4,996,246
Commercial Portfolio Segment | Hardware
Financing Receivable, Recorded Investment [Line Items]
Financing receivable	970,915	1,140,494
Commercial Portfolio Segment | Private equity/venture capital
Financing Receivable, Recorded Investment [Line Items]
Financing receivable	4,611,953	4,621,299
Commercial Portfolio Segment | Life science & healthcare
Financing Receivable, Recorded Investment [Line Items]
Financing receivable	1,612,680	1,300,727
Commercial Portfolio Segment | Premium wine
Financing Receivable, Recorded Investment [Line Items]
Financing receivable	829,205	796,649
Commercial Portfolio Segment | Other
Financing Receivable, Recorded Investment [Line Items]
Financing receivable	429,310	355,353
Commercial Portfolio Segment | Commercial loans
Financing Receivable, Recorded Investment [Line Items]
Financing receivable	13,774,119	13,210,768
Commercial Portfolio Segment | Pass | Software and internet
Financing Receivable, Recorded Investment [Line Items]
Financing receivable	4,802,522	4,611,253
Commercial Portfolio Segment | Pass | Hardware
Financing Receivable, Recorded Investment [Line Items]
Financing receivable	834,067	945,998
Commercial Portfolio Segment | Pass | Private equity/venture capital
Financing Receivable, Recorded Investment [Line Items]
Financing receivable	4,611,953	4,615,231
Commercial Portfolio Segment | Pass | Life science & healthcare
Financing Receivable, Recorded Investment [Line Items]
Financing receivable	1,446,972	1,165,266
Commercial Portfolio Segment | Pass | Premium wine
Financing Receivable, Recorded Investment [Line Items]
Financing receivable	804,411	774,962
Commercial Portfolio Segment | Pass | Other
Financing Receivable, Recorded Investment [Line Items]
Financing receivable	417,459	346,153
Commercial Portfolio Segment | Pass | Commercial loans
Financing Receivable, Recorded Investment [Line Items]
Financing receivable	12,917,384	12,458,863
Commercial Portfolio Segment | Performing (Criticized) | Software and internet
Financing Receivable, Recorded Investment [Line Items]
Financing receivable	452,742	351,706
Commercial Portfolio Segment | Performing (Criticized) | Hardware
Financing Receivable, Recorded Investment [Line Items]
Financing receivable	133,085	191,975
Commercial Portfolio Segment | Performing (Criticized) | Private equity/venture capital
Financing Receivable, Recorded Investment [Line Items]
Financing receivable	0	6,068
Commercial Portfolio Segment | Performing (Criticized) | Life science & healthcare
Financing Receivable, Recorded Investment [Line Items]
Financing receivable	120,319	134,986
Commercial Portfolio Segment | Performing (Criticized) | Premium wine
Financing Receivable, Recorded Investment [Line Items]
Financing receivable	23,593	20,383
Commercial Portfolio Segment | Performing (Criticized) | Other
Financing Receivable, Recorded Investment [Line Items]
Financing receivable	11,694	8,967
Commercial Portfolio Segment | Performing (Criticized) | Commercial loans
Financing Receivable, Recorded Investment [Line Items]
Financing receivable	741,433	714,085
Commercial Portfolio Segment | Impaired | Software and internet
Financing Receivable, Recorded Investment [Line Items]
Financing receivable	64,792	33,287
Commercial Portfolio Segment | Impaired | Hardware
Financing Receivable, Recorded Investment [Line Items]
Financing receivable	3,763	2,521
Commercial Portfolio Segment | Impaired | Private equity/venture capital
Financing Receivable, Recorded Investment [Line Items]
Financing receivable	0	0
Commercial Portfolio Segment | Impaired | Life science & healthcare
Financing Receivable, Recorded Investment [Line Items]
Financing receivable	45,389	475
Commercial Portfolio Segment | Impaired | Premium wine
Financing Receivable, Recorded Investment [Line Items]
Financing receivable	1,201	1,304
Commercial Portfolio Segment | Impaired | Other
Financing Receivable, Recorded Investment [Line Items]
Financing receivable	157	233
Commercial Portfolio Segment | Impaired | Commercial loans
Financing Receivable, Recorded Investment [Line Items]
Financing receivable	115,302	37,820
Consumer Portfolio Segment | Real estate secured loans
Financing Receivable, Recorded Investment [Line Items]
Financing receivable	1,443,170	1,117,661
Consumer Portfolio Segment | Other consumer loans
Financing Receivable, Recorded Investment [Line Items]
Financing receivable	212,652	160,337
Consumer Portfolio Segment | Consumer loans
Financing Receivable, Recorded Investment [Line Items]
Financing receivable	1,655,822	1,277,998
Consumer Portfolio Segment | Pass | Real estate secured loans
Financing Receivable, Recorded Investment [Line Items]
Financing receivable	1,433,926	1,112,396
Consumer Portfolio Segment | Pass | Other consumer loans
Financing Receivable, Recorded Investment [Line Items]
Financing receivable	211,366	158,162
Consumer Portfolio Segment | Pass | Consumer loans
Financing Receivable, Recorded Investment [Line Items]
Financing receivable	1,645,292	1,270,558
Consumer Portfolio Segment | Performing (Criticized) | Real estate secured loans
Financing Receivable, Recorded Investment [Line Items]
Financing receivable	9,085	5,073
Consumer Portfolio Segment | Performing (Criticized) | Other consumer loans
Financing Receivable, Recorded Investment [Line Items]
Financing receivable	1,286	2,050
Consumer Portfolio Segment | Performing (Criticized) | Consumer loans
Financing Receivable, Recorded Investment [Line Items]
Financing receivable	10,371	7,123
Consumer Portfolio Segment | Impaired | Real estate secured loans
Financing Receivable, Recorded Investment [Line Items]
Financing receivable	159	192
Consumer Portfolio Segment | Impaired | Other consumer loans
Financing Receivable, Recorded Investment [Line Items]
Financing receivable	0	125
Consumer Portfolio Segment | Impaired | Consumer loans
Financing Receivable, Recorded Investment [Line Items]
Financing receivable	$ 159	$ 317

Loans and Allowance for Loan 69

Loans and Allowance for Loan Losses - Summary of Loans Modified in Troubled Debt Restructurings ("TDRs") by Portfolio Segment and Class of Financing Receivables (Detail) $ in Thousands	9 Months Ended
	Sep. 30, 2015USD ($)troubled_debt_restructuring	Dec. 31, 2014USD ($)
Financing Receivable, Modifications [Line Items]
Number of loans with concessions granted to borrowers | troubled_debt_restructuring	13
Unfunded commitments available for funding for modifications (less than)	$ 500
Loans modified in TDRs	91,316	$ 7,151
Life science & healthcare
Financing Receivable, Modifications [Line Items]
Loans modified in TDRs	29,529	0
Commercial Portfolio Segment | Software and internet
Financing Receivable, Modifications [Line Items]
Loans modified in TDRs	57,766	3,784
Commercial Portfolio Segment | Hardware
Financing Receivable, Modifications [Line Items]
Loans modified in TDRs	2,301	1,118
Commercial Portfolio Segment | Premium wine
Financing Receivable, Modifications [Line Items]
Loans modified in TDRs	1,202	1,891
Commercial Portfolio Segment | Other
Financing Receivable, Modifications [Line Items]
Loans modified in TDRs	518	233
Commercial Portfolio Segment | Commercial loans
Financing Receivable, Modifications [Line Items]
Loans modified in TDRs	91,316	7,026
Consumer Portfolio Segment | Other consumer loans
Financing Receivable, Modifications [Line Items]
Loans modified in TDRs	0	125
Consumer Portfolio Segment | Consumer loans
Financing Receivable, Modifications [Line Items]
Loans modified in TDRs	$ 0	$ 125

Loans and Allowance for Loan 70

Loans and Allowance for Loan Losses - Recorded Investment in Loans Modified in TDRs (Detail) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Financing Receivable, Modifications [Line Items]
Loans modified in TDRs during the period	$ 81,800,000		$ 89,800,000
Loans classified as TDRs, charge-offs	22,400,000	$ 0	21,500,000	$ 0
Life science & healthcare
Financing Receivable, Modifications [Line Items]
Loans modified in TDRs during the period	29,530,000	0
Other
Financing Receivable, Modifications [Line Items]
Loans modified in TDRs during the period	518,000	0	518,000	0
Payment deferral
Financing Receivable, Modifications [Line Items]
Loans modified in TDRs during the period				7,100,000
Partial principal forgiveness
Financing Receivable, Modifications [Line Items]
Loans modified in TDRs during the period				1,300,000
Court Order [Member]
Financing Receivable, Modifications [Line Items]
Loans modified in TDRs during the period			1,500,000
Commercial Portfolio Segment
Financing Receivable, Modifications [Line Items]
Loans modified in TDRs during the period	81,797,000	496,000	89,845,000	8,462,000
TDRs modified within the previous 12 months that defaulted during the period	14,096,000		20,113,000
Commercial Portfolio Segment | Software and internet
Financing Receivable, Modifications [Line Items]
Loans modified in TDRs during the period	51,749,000	496,000	57,766,000	7,848,000
TDRs modified within the previous 12 months that defaulted during the period	11,107,000		17,124,000
Commercial Portfolio Segment | Hardware
Financing Receivable, Modifications [Line Items]
Loans modified in TDRs during the period	0	0	2,031,000	0
TDRs modified within the previous 12 months that defaulted during the period	2,031,000		2,031,000
Commercial Portfolio Segment | Life science & healthcare
Financing Receivable, Modifications [Line Items]
Loans modified in TDRs during the period			29,530,000	0
TDRs modified within the previous 12 months that defaulted during the period	958,000		958,000
Commercial Portfolio Segment | Premium wine
Financing Receivable, Modifications [Line Items]
Loans modified in TDRs during the period	$ 0	$ 0	$ 0	$ 614,000

Disposal - Assets Held-for-Sa71

Disposal - Assets Held-for-Sale (Details) $ in Millions	Dec. 31, 2014USD ($)
Disposal Group, Held-for-sale, Not Discontinued Operations | SVB India Finance Private Limited, (SVBIF)
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Total assets of SVBIF held-for-sale	$ 44.3

Short-Term Borrowings and Lon72

Short-Term Borrowings and Long-Term Debt - Outstanding Short Term Borrowings and Long Term Debt (Detail) - USD ($)	9 Months Ended
	Sep. 30, 2015	Jan. 29, 2015	Dec. 31, 2014
Debt Outstanding [Line Items]
Short-term borrowings	$ 3,756,000		$ 7,781,000
Total long-term debt	$ 797,211,000		451,362,000
Other short-term borrowings
Debt Outstanding [Line Items]
Principal value at period end
Short-term borrowings	$ 3,756,000		7,781,000
3.50% Senior Notes
Debt Outstanding [Line Items]
Maturity	Jan. 29, 2025
Principal value at period end	$ 350,000,000	$ 350,000,000
Senior Notes	$ 346,591,000		0
5.375% Senior Notes
Debt Outstanding [Line Items]
Maturity	Sep. 15, 2020
Principal value at period end	$ 350,000,000
Senior Notes	$ 346,878,000		346,477,000
6.05% Subordinated Notes
Debt Outstanding [Line Items]
Maturity	Jun. 1, 2017
Principal value at period end	$ 45,964,000
Subordinated Notes	$ 49,028,000		50,040,000
7.0% Junior Subordinated Debentures
Debt Outstanding [Line Items]
Maturity	Oct. 15, 2033
Principal value at period end	$ 50,000,000
Junior Subordinated Debentures	$ 54,714,000		$ 54,845,000

Short-Term Borrowings and Lon73

Short-Term Borrowings and Long-Term Debt - Outstanding Short Term Borrowings and Long Term Debt (Additional Information) (Detail) - USD ($) $ in Millions	Sep. 30, 2015	Dec. 31, 2014
3.50% Senior Notes
Debt Outstanding [Line Items]
Interest rate on debt	3.50%
5.375% Senior Notes
Debt Outstanding [Line Items]
Interest rate on debt	5.375%	5.375%
6.05% Subordinated Notes
Debt Outstanding [Line Items]
Interest rate on debt	6.05%	6.05%
Fair value of the interest rate swap associated with the notes	$ 3.5	$ 4.6
7.0% Junior Subordinated Debentures
Debt Outstanding [Line Items]
Interest rate on debt	7.00%	7.00%

Short-Term Borrowings and Lon74

Short-Term Borrowings and Long-Term Debt - Additional Information (Detail) - USD ($)	Jan. 29, 2015	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014	Dec. 31, 2014
Debt Disclosure [Line Items]
Interest expense on debt		$ 9,000,000	$ 5,800,000	$ 25,900,000	$ 17,400,000
Weighted average interest rates associated with short-term borrowings		11.00%		11.00%
Proceeds from issuance of 3.50% Senior Notes				$ 346,431,000	$ 0
6.05% Subordinated Notes
Debt Disclosure [Line Items]
Interest rate on debt		6.05%		6.05%		6.05%
Fair value of the interest rate swap associated with the notes		$ 3,500,000		$ 3,500,000		$ 4,600,000
Principal value at period end		$ 45,964,000		$ 45,964,000
3.50% Senior Notes
Debt Disclosure [Line Items]
Interest rate on debt		3.50%		3.50%
Debt issuance costs		$ 3,000,000		$ 3,000,000
Unamortized discount on debt		300,000		300,000
Principal value at period end	$ 350,000,000	350,000,000		350,000,000
Federal Home Loan Bank Advances
Debt Disclosure [Line Items]
Market value of collateral pledged		$ 1,300,000,000		$ 1,300,000,000
5.375% Senior Notes
Debt Disclosure [Line Items]
Interest rate on debt		5.375%		5.375%		5.375%
Principal value at period end		$ 350,000,000		$ 350,000,000
Proceeds from issuance of 3.50% Senior Notes	$ 346,400,000
Federal Reserve Bank Advances
Debt Disclosure [Line Items]
Market value of collateral pledged		920,000,000		920,000,000
Interest rate swaps | 6.05% Subordinated Notes
Debt Disclosure [Line Items]
Fair value of the interest rate swap associated with the notes		$ 3,500,000		$ 3,500,000		$ 4,600,000

Derivative Financial Instrume75

Derivative Financial Instruments - Total Notional or Contractual Amounts, Fair Value, Collateral and Net Exposure of Derivative Financial Instruments (Detail) - USD ($) $ in Thousands	Sep. 30, 2015	Dec. 31, 2014
Derivative [Line Items]
Fair Value, Net Total	$ 137,353	$ 126,879
Net Exposure, Net	133,597	119,098
Collateral	3,756	7,781
Derivatives designated as hedging instruments | Interest rate risks | Other assets | Interest rate swaps
Derivative [Line Items]
Notional or Contractual Amount	45,964	45,964
Fair Value, Assets	3,485	4,609
Net Exposure, Assets	3,485	1,639
Collateral	0	2,970
Derivatives not designated as hedging instruments | Currency exchange risks
Derivative [Line Items]
Fair Value, Net exposure	(481)	4,561
Net Exposure, Net	(481)	2,120
Collateral	0	2,441
Derivatives not designated as hedging instruments | Currency exchange risks | Other assets | Foreign exchange forwards
Derivative [Line Items]
Notional or Contractual Amount	17,038	200,957
Fair Value, Assets	594	5,050
Net Exposure, Assets	594	2,609
Collateral	0	2,441
Derivatives not designated as hedging instruments | Currency exchange risks | Other liability | Foreign exchange forwards
Derivative [Line Items]
Notional or Contractual Amount	37,609	6,226
Fair value, Liabilities	(1,075)	(489)
Net Exposure, Liabilities	(1,075)	(489)
Collateral	0	0
Derivatives not designated as hedging instruments | Other derivative instruments | Other derivatives
Derivative [Line Items]
Fair Value, Net exposure	4,258	1,105
Net Exposure, Net	502	(1,265)
Collateral	3,756	2,370
Derivatives not designated as hedging instruments | Other derivative instruments | Other assets | Equity warrant assets
Derivative [Line Items]
Notional or Contractual Amount	208,270	197,878
Fair Value, Assets	130,091	116,604
Net Exposure, Assets	130,091	116,604
Collateral	0	0
Derivatives not designated as hedging instruments | Other derivative instruments | Other assets | Other derivatives | Foreign exchange forwards
Derivative [Line Items]
Notional or Contractual Amount	733,204	801,487
Fair Value, Assets	32,431	28,954
Net Exposure, Assets	28,675	26,584
Collateral	3,756	2,370
Derivatives not designated as hedging instruments | Other derivative instruments | Other assets | Other derivatives | Client foreign currency options
Derivative [Line Items]
Notional or Contractual Amount	28,390	34,926
Fair Value, Assets	246	227
Net Exposure, Assets	246	227
Collateral	0	0
Derivatives not designated as hedging instruments | Other derivative instruments | Other assets | Other derivatives | Client interest rate derivatives
Derivative [Line Items]
Notional or Contractual Amount	459,614	387,410
Fair Value, Assets	5,164	2,546
Net Exposure, Assets	5,164	2,546
Collateral	0	0
Derivatives not designated as hedging instruments | Other derivative instruments | Other liability | Other derivatives | Foreign exchange forwards
Derivative [Line Items]
Notional or Contractual Amount	695,403	774,355
Fair value, Liabilities	(27,618)	(27,647)
Net Exposure, Liabilities	(27,618)	(27,647)
Collateral	0	0
Derivatives not designated as hedging instruments | Other derivative instruments | Other liability | Other derivatives | Client foreign currency options
Derivative [Line Items]
Notional or Contractual Amount	28,390	34,926
Fair value, Liabilities	(246)	(227)
Net Exposure, Liabilities	(246)	(227)
Collateral	0	0
Derivatives not designated as hedging instruments | Other derivative instruments | Other liability | Other derivatives | Client interest rate derivatives
Derivative [Line Items]
Notional or Contractual Amount	459,614	387,410
Fair value, Liabilities	(5,719)	(2,748)
Net Exposure, Liabilities	(5,719)	(2,748)
Collateral	$ 0	$ 0

Derivative Financial Instrume76

Derivative Financial Instruments - Summary of Derivative Activity and Related Impact on Consolidated Statements of Income (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Derivative Instruments, Gain (Loss) [Line Items]
Unrealized gain (loss) on derivatives			$ 42,295	$ (2,028)
Derivatives designated as hedging instruments | Interest rate risks | Interest rate swaps | Interest expense—borrowings
Derivative Instruments, Gain (Loss) [Line Items]
Unrealized gain (loss) on derivatives	$ 631	$ 638	1,903	1,915
Derivatives designated as hedging instruments | Interest rate risks | Interest rate swaps | Net gains on derivative instruments
Derivative Instruments, Gain (Loss) [Line Items]
Unrealized gain (loss) on derivatives	(8)	(12)	(22)	(37)
Derivatives designated as hedging instruments | Interest rate risks | Interest Rate Risk
Derivative Instruments, Gain (Loss) [Line Items]
Unrealized gain (loss) on derivatives	623	626	1,881	1,878
Derivatives not designated as hedging instruments | Currency exchange risks
Derivative Instruments, Gain (Loss) [Line Items]
Unrealized gain (loss) on derivatives	(32)	(111)	(41)	(309)
Derivatives not designated as hedging instruments | Currency exchange risks | Loans | Other noninterest income
Derivative Instruments, Gain (Loss) [Line Items]
Unrealized gain (loss) on derivatives	186	(12,640)	(11,667)	(12,347)
Derivatives not designated as hedging instruments | Currency exchange risks | Foreign exchange forwards | Net gains on derivative instruments
Derivative Instruments, Gain (Loss) [Line Items]
Unrealized gain (loss) on derivatives	(218)	12,529	11,626	12,038
Derivatives not designated as hedging instruments | Other derivative instruments | Other derivatives | Net gains on derivative instruments
Derivative Instruments, Gain (Loss) [Line Items]
Unrealized gain (loss) on derivatives	(394)	(22)	(352)	(738)
Derivatives not designated as hedging instruments | Other derivative instruments | Foreign exchange forwards | Net gains on derivative instruments
Derivative Instruments, Gain (Loss) [Line Items]
Unrealized gain (loss) on derivatives	179	886	459	1,358
Derivatives not designated as hedging instruments | Other derivative instruments | Equity warrant assets | Net gains on derivative instruments
Derivative Instruments, Gain (Loss) [Line Items]
Unrealized gain (loss) on derivatives	$ 10,685	$ 13,157	$ 54,579	$ 50,859

Derivative Financial Instrume77

Derivative Financial Instruments - Master Netting Arrangements (Details) - USD ($) $ in Thousands	Sep. 30, 2015	Dec. 31, 2014
Assets and Liabilities Subject to Master Netting Arrangements [Line Items]
Gross Amounts of Recognized Assets	$ 256,480	$ 137,271
Gross Amounts offset in the Statement of Financial Position	(76)	(274)
Net Amounts of Assets Presented in the Statement of Financial Position	256,404	136,997
Gross Assets Subject To Master Netting Arrangement Not Offset	(242,658)	(117,783)
Cash Collateral Received Subject to Master Netting Arrangements	(3,756)	(7,781)
Net Assets After Deducting Amounts Subject to Master Netting Arrangements	9,990	11,433
Gross Amounts of Recognized Liabilities	34,734	31,385
Gross Amounts offset in the Statement of Financial Position	(76)	(274)
Net Amounts of Liabilities Presented in the Statement of Financial Position	34,658	31,111
Gross Liabilities Subject To Master Netting Arrangement Not Offset	(16,142)	(19,639)
Cash Collateral Pledged Subject to Master Netting Arrangements	0	0
Net Liabilities After Deducting Amounts Subject to Master Netting Arrangements	18,516	11,472
Derivative
Assets and Liabilities Subject to Master Netting Arrangements [Line Items]
Gross Amounts of Recognized Assets	41,996	41,660
Gross Amounts offset in the Statement of Financial Position	(76)	(274)
Net Amounts of Assets Presented in the Statement of Financial Position	41,920	41,386
Gross Assets Subject To Master Netting Arrangement Not Offset	(28,174)	(22,172)
Cash Collateral Received Subject to Master Netting Arrangements	(3,756)	(7,781)
Net Assets After Deducting Amounts Subject to Master Netting Arrangements	9,990	11,433
Gross Amounts of Recognized Liabilities	34,734	31,385
Gross Amounts offset in the Statement of Financial Position	(76)	(274)
Net Amounts of Liabilities Presented in the Statement of Financial Position	34,658	31,111
Gross Liabilities Subject To Master Netting Arrangement Not Offset	(16,142)	(19,639)
Cash Collateral Pledged Subject to Master Netting Arrangements	0	0
Net Liabilities After Deducting Amounts Subject to Master Netting Arrangements	18,516	11,472
Derivative | Interest rate swaps
Assets and Liabilities Subject to Master Netting Arrangements [Line Items]
Gross Amounts of Recognized Assets	3,485	4,609
Gross Amounts offset in the Statement of Financial Position	0	0
Net Amounts of Assets Presented in the Statement of Financial Position	3,485	4,609
Gross Assets Subject To Master Netting Arrangement Not Offset	(3,485)	(1,639)
Cash Collateral Received Subject to Master Netting Arrangements	0	(2,970)
Net Assets After Deducting Amounts Subject to Master Netting Arrangements	0	0
Derivative | Foreign exchange forwards
Assets and Liabilities Subject to Master Netting Arrangements [Line Items]
Gross Amounts of Recognized Assets	33,025	34,004
Gross Amounts offset in the Statement of Financial Position	0	0
Net Amounts of Assets Presented in the Statement of Financial Position	33,025	34,004
Gross Assets Subject To Master Netting Arrangement Not Offset	(19,373)	(17,843)
Cash Collateral Received Subject to Master Netting Arrangements	(3,756)	(4,811)
Net Assets After Deducting Amounts Subject to Master Netting Arrangements	9,896	11,350
Gross Amounts of Recognized Liabilities	28,693	28,136
Gross Amounts offset in the Statement of Financial Position	0	0
Net Amounts of Liabilities Presented in the Statement of Financial Position	28,693	28,136
Gross Liabilities Subject To Master Netting Arrangement Not Offset	(10,329)	(16,808)
Cash Collateral Pledged Subject to Master Netting Arrangements	0	0
Net Liabilities After Deducting Amounts Subject to Master Netting Arrangements	18,364	11,328
Derivative | Client foreign currency options
Assets and Liabilities Subject to Master Netting Arrangements [Line Items]
Gross Amounts of Recognized Assets	322	501
Gross Amounts offset in the Statement of Financial Position	(76)	(274)
Net Amounts of Assets Presented in the Statement of Financial Position	246	227
Gross Assets Subject To Master Netting Arrangement Not Offset	(152)	(144)
Cash Collateral Received Subject to Master Netting Arrangements	0	0
Net Assets After Deducting Amounts Subject to Master Netting Arrangements	94	83
Gross Amounts of Recognized Liabilities	322	501
Gross Amounts offset in the Statement of Financial Position	(76)	(274)
Net Amounts of Liabilities Presented in the Statement of Financial Position	246	227
Gross Liabilities Subject To Master Netting Arrangement Not Offset	(94)	(83)
Cash Collateral Pledged Subject to Master Netting Arrangements	0	0
Net Liabilities After Deducting Amounts Subject to Master Netting Arrangements	152	144
Derivative | Client interest rate derivatives
Assets and Liabilities Subject to Master Netting Arrangements [Line Items]
Gross Amounts of Recognized Assets	5,164	2,546
Gross Amounts offset in the Statement of Financial Position	0	0
Net Amounts of Assets Presented in the Statement of Financial Position	5,164	2,546
Gross Assets Subject To Master Netting Arrangement Not Offset	(5,164)	(2,546)
Cash Collateral Received Subject to Master Netting Arrangements	0	0
Net Assets After Deducting Amounts Subject to Master Netting Arrangements	0	0
Gross Amounts of Recognized Liabilities	5,719	2,748
Gross Amounts offset in the Statement of Financial Position	0	0
Net Amounts of Liabilities Presented in the Statement of Financial Position	5,719	2,748
Gross Liabilities Subject To Master Netting Arrangement Not Offset	(5,719)	(2,748)
Cash Collateral Pledged Subject to Master Netting Arrangements	0	0
Net Liabilities After Deducting Amounts Subject to Master Netting Arrangements	0	0
Reverse Repurchase Securities Borrowing And Similar Arrangements
Assets and Liabilities Subject to Master Netting Arrangements [Line Items]
Gross Amounts of Recognized Assets	214,484	95,611
Gross Amounts offset in the Statement of Financial Position	0	0
Net Amounts of Assets Presented in the Statement of Financial Position	214,484	95,611
Gross Assets Subject To Master Netting Arrangement Not Offset	(214,484)	(95,611)
Cash Collateral Received Subject to Master Netting Arrangements	0	0
Net Assets After Deducting Amounts Subject to Master Netting Arrangements	0	0
Gross Amounts of Recognized Liabilities	0	0
Gross Amounts offset in the Statement of Financial Position	0	0
Net Amounts of Liabilities Presented in the Statement of Financial Position	0	0
Gross Liabilities Subject To Master Netting Arrangement Not Offset	0	0
Cash Collateral Pledged Subject to Master Netting Arrangements	0	0
Net Liabilities After Deducting Amounts Subject to Master Netting Arrangements	$ 0	$ 0

Other Noninterest Income and 78

Other Noninterest Income and Other Noninterest Expense - Summary of Other Noninterest Income (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015		Sep. 30, 2014
Other Income and Expenses [Abstract]
Fund management fees	$ 4,074	$ 3,574	$ 11,657		$ 9,888
Service-based fee income	1,931	2,180	6,450		6,459
Gains (losses) on revaluation of foreign currency instruments	186	(12,640)	(11,667)		(12,347)
Other	4,886	1,525	15,875		10,601
Total other noninterest income	$ 11,077	$ (5,361)	$ 22,315	[1]	$ 14,601
[1]	Amounts for the nine months ended September 30, 2015, have been revised to reflect the retrospective application of new accounting guidance adopted in the second quarter of 2015 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 1— "Basis of Presentation” of the “Notes to Interim Consolidated Financial Statements (unaudited)” under Part I, Item 1 of this report for additional details.

Other Noninterest Income and 79

Other Noninterest Income and Other Noninterest Expense - Summary of Other Noninterest Expense (Detail) - USD ($) $ in Thousands		3 Months Ended		9 Months Ended
		Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015		Sep. 30, 2014
Other Income and Expenses [Abstract]
Lending and other client related processing costs		$ 3,608	$ 3,215	$ 10,861		$ 8,160
Telephone		2,224	1,931	6,727		5,217
Data processing services		2,083	2,229	5,274		6,497
Postage and supplies		728	763	2,220		2,248
Dues and publications		521	719	1,803		1,852
Other		5,106	4,711	15,216		9,381
Total other noninterest expense	[1]	$ 14,270	$ 13,568	$ 42,101	[2]	$ 33,355
[1]	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 1— "Basis of Presentation" of the "Notes to Interim Consolidated Financial Statements" under Part I, Item 1 in this report.
[2]	Amounts for the nine months ended September 30, 2015, have been revised to reflect the retrospective application of new accounting guidance adopted in the second quarter of 2015 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 1— "Basis of Presentation” of the “Notes to Interim Consolidated Financial Statements (unaudited)” under Part I, Item 1 of this report for additional details.

Segment Reporting - Additional

Segment Reporting - Additional Information (Detail)	9 Months Ended
	Sep. 30, 2015Segment
Segment Reporting [Abstract]
Number of reportable segments	3

Segment Reporting - Segment Inf

Segment Reporting - Segment Information (Detail) - USD ($) $ in Thousands		3 Months Ended		9 Months Ended
		Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015		Sep. 30, 2014
Segment Reporting Information [Line Items]
Net interest income		$ 254,660	$ 220,565	$ 737,356	[1]	$ 621,858
Provision for loan losses		(33,403)	(16,610)	(66,368)	[1]	(19,051)
Noninterest income		108,477	80,167	358,288	[1]	404,602
Noninterest expense	[2]	(184,755)	(179,761)	(569,408)	[1]	(521,113)
Income before income tax expense	[2]	144,979	104,361	459,868	[1]	486,296
Total average loans, net of unearned income		14,916,652	11,439,521	14,431,785		11,098,397
Total average assets		42,019,224	34,596,065	39,911,525		31,402,952
Total average deposits		37,383,067	29,726,284	35,413,353		26,882,113
Global Commercial Bank
Segment Reporting Information [Line Items]
Net interest income		217,929	187,184	625,618		540,533
Provision for loan losses		(32,076)	(16,185)	(64,128)		(18,833)
Noninterest income		68,517	57,714	197,740		169,376
Noninterest expense		(135,504)	(127,050)	(415,245)		(369,587)
Income before income tax expense		118,866	101,663	343,985		321,489
Total average loans, net of unearned income		13,031,928	10,022,333	12,721,208		9,766,870
Total average assets		40,211,915	31,916,581	37,954,846		28,924,331
Total average deposits		36,149,772	28,795,499	34,125,675		26,020,715
SVB Private Bank
Segment Reporting Information [Line Items]
Net interest income		11,667	7,344	32,499		23,529
Provision for loan losses		(1,327)	(425)	(2,240)		(218)
Noninterest income		506	491	1,498		1,121
Noninterest expense		(2,703)	(2,574)	(8,589)		(7,709)
Income before income tax expense		8,143	4,836	23,168		16,723
Total average loans, net of unearned income		1,669,858	1,189,976	1,529,095		1,119,618
Total average assets		1,273,823	1,128,938	1,659,981		1,026,678
Total average deposits		1,041,773	877,701	1,125,345		805,167
SVB Capital
Segment Reporting Information [Line Items]
Net interest income		1	12	3		55
Provision for loan losses		0	0	0		0
Noninterest income		17,332	1,064	57,919		35,617
Noninterest expense		(3,745)	(3,036)	(10,935)		(8,815)
Income before income tax expense		13,588	(1,960)	46,987		26,857
Total average loans, net of unearned income		0	0	0		0
Total average assets		334,045	302,949	335,136		328,048
Total average deposits		0	0	0		0
Other Items
Segment Reporting Information [Line Items]
Net interest income		25,063	26,025	79,236		57,741
Provision for loan losses		0	0	0		0
Noninterest income		22,122	20,898	101,131		198,488
Noninterest expense		(42,803)	(47,101)	(134,639)		(135,002)
Income before income tax expense		4,382	(178)	45,728		121,227
Total average loans, net of unearned income		214,866	227,212	181,482		211,909
Total average assets		199,441	1,247,597	(38,438)		1,123,895
Total average deposits		$ 191,522	$ 53,084	$ 162,333		$ 56,231
[1]	Amounts for the nine months ended September 30, 2015, have been revised to reflect the retrospective application of new accounting guidance adopted in the second quarter of 2015 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 1— "Basis of Presentation” of the “Notes to Interim Consolidated Financial Statements (unaudited)” under Part I, Item 1 of this report for additional details.
[2]	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 1— "Basis of Presentation" of the "Notes to Interim Consolidated Financial Statements" under Part I, Item 1 in this report.

Segment Reporting - Segment I82

Segment Reporting - Segment Information (Additional Information) (Detail) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Global Commercial Bank
Segment Reporting Information [Line Items]
Depreciation and amortization	$ 4.7	$ 5.4	$ 14.4	$ 15.4

Off-Balance Sheet Arrangement83

Off-Balance Sheet Arrangements, Guarantees and Other Commitments - Summary Information Related to Commitments to Extend Credit (Excluding Letters of Credit) (Detail) - USD ($) $ in Thousands	Sep. 30, 2015	Dec. 31, 2014
Disclosure Off Balance Sheet Arrangements Guarantees And Other Commitments Additional Information [Abstract]
Fixed interest rate commitments	$ 1,393,396	$ 1,591,408
Variable interest rate commitments	13,302,099	11,860,039
Total loan commitments available for funding	14,695,495	13,451,447
Commercial and standby letters of credit	1,391,812	1,254,338
Total unfunded credit commitments	16,087,307	14,705,785
Commitments unavailable for funding	2,141,183	1,868,489
Maximum lending limits for accounts receivable factoring arrangements	1,084,623	1,044,548
Reserve for unfunded credit commitments	$ 36,631	$ 36,419

Off-Balance Sheet Arrangement84

Off-Balance Sheet Arrangements, Guarantees and Other Commitments - Summary of Commercial and Standby Letters of Credit (Detail) - USD ($) $ in Thousands	Sep. 30, 2015	Dec. 31, 2014
Guarantor Obligations [Line Items]
Expires In One Year or Less	$ 1,313,260
Expires After One Year	78,552
Total Amount Outstanding	1,391,812	$ 1,254,338
Maximum Amount of Future Payments	1,391,812
Financial standby letters of credit
Guarantor Obligations [Line Items]
Expires In One Year or Less	1,251,147
Expires After One Year	68,343
Total Amount Outstanding	1,319,490
Maximum Amount of Future Payments	1,319,490
Performance standby letters of credit
Guarantor Obligations [Line Items]
Expires In One Year or Less	50,220
Expires After One Year	10,209
Total Amount Outstanding	60,429
Maximum Amount of Future Payments	60,429
Commercial letters of credit
Guarantor Obligations [Line Items]
Expires In One Year or Less	11,893
Expires After One Year	0
Total Amount Outstanding	11,893
Maximum Amount of Future Payments	$ 11,893

Off-Balance Sheet Arrangement85

Off-Balance Sheet Arrangements, Guarantees and Other Commitments - Summary of Commercial and Standby Letters of Credit (Additional Information) (Detail) - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2015	Dec. 31, 2014
Venture capital and private equity fund investments
Commitments and Contingencies Disclosure [Line Items]
Commitments to invest, period from the inception of the fund	10 years
Call unrestricted, percentage of committed capital	100.00%
Venture capital and private equity fund investments | Lower Limit
Commitments and Contingencies Disclosure [Line Items]
Expected commitment period to invest in venture capital and private equity funds (in years)	5 years
Venture capital and private equity fund investments | Upper Limit
Commitments and Contingencies Disclosure [Line Items]
Expected commitment period to invest in venture capital and private equity funds (in years)	7 years
Standby Letter of Credit
Commitments and Contingencies Disclosure [Line Items]
Deferred fees	$ 8.9	$ 8.4
Collateral in the form of cash	587.5
Collateral in the form of investment securities	$ 0.6

Off-Balance Sheet Arrangement86

Off-Balance Sheet Arrangements, Guarantees and Other Commitments - Total Capital Commitments, Unfunded Capital Commitments, and Our Ownership in Each Fund (Detail) $ in Thousands	9 Months Ended
	Sep. 30, 2015USD ($)
Venture Capital and Private Equity Fund Investments [Line Items]
SVBFG Unfunded Commitments	$ 10,878
SVB Strategic Investors Fund, LP
Venture Capital and Private Equity Fund Investments [Line Items]
SVBFG Unfunded Commitments	2,250
SVB Capital Preferred Return Fund, LP
Venture Capital and Private Equity Fund Investments [Line Items]
SVBFG Unfunded Commitments	4,673
SVB Capital—NT Growth Partners, LP
Venture Capital and Private Equity Fund Investments [Line Items]
SVBFG Unfunded Commitments	3,878
Other private equity fund
Venture Capital and Private Equity Fund Investments [Line Items]
SVBFG Unfunded Commitments	77
Parent Company
Venture Capital and Private Equity Fund Investments [Line Items]
SVBFG Capital Commitments	486,692
SVBFG Unfunded Commitments	19,351
Parent Company | Silicon Valley BancVentures, LP
Venture Capital and Private Equity Fund Investments [Line Items]
SVBFG Capital Commitments	6,000
SVBFG Unfunded Commitments	$ 270
SVBFG Ownership of each Fund	10.70%
Parent Company | SVB Capital Partners II, LP
Venture Capital and Private Equity Fund Investments [Line Items]
SVBFG Capital Commitments	$ 1,200
SVBFG Unfunded Commitments	$ 162
SVBFG Ownership of each Fund	5.10%
Parent Company | SVB Capital Shanghai Yangpu Venture Capital Fund
Venture Capital and Private Equity Fund Investments [Line Items]
SVBFG Capital Commitments	$ 935
SVBFG Unfunded Commitments	$ 0
SVBFG Ownership of each Fund	6.80%
Parent Company | SVB Strategic Investors Fund, LP
Venture Capital and Private Equity Fund Investments [Line Items]
SVBFG Capital Commitments	$ 15,300
SVBFG Unfunded Commitments	$ 688
SVBFG Ownership of each Fund	12.60%
Parent Company | SVB Strategic Investors Fund II, LP
Venture Capital and Private Equity Fund Investments [Line Items]
SVBFG Capital Commitments	$ 15,000
SVBFG Unfunded Commitments	$ 1,050
SVBFG Ownership of each Fund	8.60%
Parent Company | SVB Strategic Investors Fund III, LP
Venture Capital and Private Equity Fund Investments [Line Items]
SVBFG Capital Commitments	$ 15,000
SVBFG Unfunded Commitments	$ 1,275
SVBFG Ownership of each Fund	5.90%
Parent Company | SVB Strategic Investors Fund IV, LP
Venture Capital and Private Equity Fund Investments [Line Items]
SVBFG Capital Commitments	$ 12,239
SVBFG Unfunded Commitments	$ 2,325
SVBFG Ownership of each Fund	5.00%
Parent Company | Strategic Investors Fund V Funds
Venture Capital and Private Equity Fund Investments [Line Items]
SVBFG Capital Commitments	$ 515
SVBFG Unfunded Commitments	177
Parent Company | SVB Capital Preferred Return Fund, LP
Venture Capital and Private Equity Fund Investments [Line Items]
SVBFG Capital Commitments	12,688
SVBFG Unfunded Commitments	$ 0
SVBFG Ownership of each Fund	20.00%
Parent Company | SVB Capital—NT Growth Partners, LP
Venture Capital and Private Equity Fund Investments [Line Items]
SVBFG Capital Commitments	$ 24,670
SVBFG Unfunded Commitments	$ 1,340
SVBFG Ownership of each Fund	33.00%
Parent Company | Other private equity fund
Venture Capital and Private Equity Fund Investments [Line Items]
SVBFG Capital Commitments	$ 9,338
SVBFG Unfunded Commitments	$ 0
SVBFG Ownership of each Fund	58.20%
Parent Company | Debt funds
Venture Capital and Private Equity Fund Investments [Line Items]
SVBFG Capital Commitments	$ 73,830
SVBFG Unfunded Commitments	0
Parent Company | Other fund investments
Venture Capital and Private Equity Fund Investments [Line Items]
SVBFG Capital Commitments	299,977
SVBFG Unfunded Commitments	$ 12,064

Off-Balance Sheet Arrangement87

Off-Balance Sheet Arrangements, Guarantees and Other Commitments - Total Capital Commitments, Unfunded Capital Commitments, and Our Ownership in Each Fund (Additional Information) (Detail) - Venture capital and private equity fund investments - Investment	9 Months Ended	12 Months Ended
	Sep. 30, 2015	Dec. 31, 2014
Other fund investments
Venture Capital and Private Equity Fund Investments [Line Items]
Number of other funds with investment commitments	276
Other fund investments | Upper Limit
Venture Capital and Private Equity Fund Investments [Line Items]
Percentage of ownership	5.00%
Fair value accounting | SVB Capital Partners II, LP
Venture Capital and Private Equity Fund Investments [Line Items]
Percentage of ownership		5.10%
Fair value accounting | Other private equity fund
Venture Capital and Private Equity Fund Investments [Line Items]
Percentage of ownership	58.20%	58.20%
Fair value accounting | Direct ownership interest | SVB Capital Partners II, LP
Venture Capital and Private Equity Fund Investments [Line Items]
Percentage of ownership	1.30%
Fair value accounting | Direct ownership interest | Other private equity fund
Venture Capital and Private Equity Fund Investments [Line Items]
Percentage of ownership	41.50%
Fair value accounting | Indirect ownership interest | SVB Capital Partners II, LP
Venture Capital and Private Equity Fund Investments [Line Items]
Percentage of ownership	3.80%
Fair value accounting | Indirect ownership interest | Other private equity fund | SVB Capital Preferred Return Fund, LP
Venture Capital and Private Equity Fund Investments [Line Items]
Percentage of ownership	4.10%
Fair value accounting | Indirect ownership interest | Other private equity fund | SVB Capital—NT Growth Partners, LP
Venture Capital and Private Equity Fund Investments [Line Items]
Percentage of ownership	12.60%

Off-Balance Sheet Arrangement88

Off-Balance Sheet Arrangements, Guarantees and Other Commitments - Remaining Unfunded Commitments to Venture Capital or Private Equity Funds by our Consolidated Managed Funds (Detail) $ in Thousands	Sep. 30, 2015USD ($)
Commitments and Contingencies Disclosure [Line Items]
SVBFG Unfunded Commitments	$ 10,878
SVB Strategic Investors Fund, LP
Commitments and Contingencies Disclosure [Line Items]
SVBFG Unfunded Commitments	2,250
SVB Capital Preferred Return Fund, LP
Commitments and Contingencies Disclosure [Line Items]
SVBFG Unfunded Commitments	4,673
SVB Capital—NT Growth Partners, LP
Commitments and Contingencies Disclosure [Line Items]
SVBFG Unfunded Commitments	3,878
Other private equity fund
Commitments and Contingencies Disclosure [Line Items]
SVBFG Unfunded Commitments	$ 77

Income Taxes (Detail)

Income Taxes (Detail) $ in Millions	Sep. 30, 2015USD ($)
Income Tax Disclosure [Abstract]
Unrecognized tax benefit	$ 3.5
Income tax reduction from recognized tax benefit	$ 2.3

Fair Value of Financial Instr90

Fair Value of Financial Instruments - Assets and Liabilities Measured at Fair Value on a Recurring Basis (Detail) - USD ($) $ in Thousands	Sep. 30, 2015	Dec. 31, 2014
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Carrying Value	$ 15,307,661	$ 13,540,655
Derivatives designated as hedging instruments | Interest rate risks | Interest rate swaps | Other assets
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value, Assets	3,485	4,609
Derivatives not designated as hedging instruments | Other derivative instruments | Equity warrant asset | Other assets
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value, Assets	130,091	116,604
Fair value accounting
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Non-marketable securities	779	108,251
Fair value accounting | Venture capital and private equity fund investments
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Non-marketable securities	154,660	1,130,882
Fair value accounting | Other venture capital investments
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Non-marketable securities	3,390	71,204
U.S. treasury securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Carrying Value	10,197,025	7,302,273
U.S. agency debentures
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Carrying Value	2,942,968	3,561,556
Residential mortgage-backed securities | Agency-issued collateralized mortgage obligations | Fixed rate
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Carrying Value	1,517,702	1,884,843
Residential mortgage-backed securities | Agency-issued collateralized mortgage obligations | Variable rate
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Carrying Value	645,288	784,475
Equity securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Carrying Value	4,678	7,508
Fair Value, Measurements, Recurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Carrying Value	15,307,661	13,540,655
Total assets	15,638,501	15,008,982
Total liabilities	34,658	31,111
Fair Value, Measurements, Recurring | Derivatives designated as hedging instruments | Interest rate risks | Interest rate swaps | Other assets
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value, Assets	3,485	4,609
Fair Value, Measurements, Recurring | Derivatives not designated as hedging instruments | Currency exchange risks | Other assets
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value, Assets	33,271	34,231
Fair Value, Measurements, Recurring | Derivatives not designated as hedging instruments | Currency exchange risks | Other liability
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value, Liabilities	28,939	28,363
Fair Value, Measurements, Recurring | Derivatives not designated as hedging instruments | Other derivative instruments | Equity warrant asset | Other assets
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value, Assets	130,091	116,604
Fair Value, Measurements, Recurring | Derivatives not designated as hedging instruments | Other derivative instruments | Client interest rate derivatives | Other assets
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value, Assets	5,164	2,546
Fair Value, Measurements, Recurring | Derivatives not designated as hedging instruments | Other derivative instruments | Client interest rate derivatives | Other liability
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value, Liabilities	5,719	2,748
Fair Value, Measurements, Recurring | Fair value accounting
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Non-marketable securities	158,829	1,310,337
Fair Value, Measurements, Recurring | Fair value accounting | Venture capital and private equity fund investments
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Non-marketable securities		1,130,882
Fair Value, Measurements, Recurring | Fair value accounting | Other venture capital investments
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Non-marketable securities	3,390	71,204
Fair Value, Measurements, Recurring | Fair value accounting | Other securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Non-marketable securities	779	108,251
Fair Value, Measurements, Recurring | U.S. treasury securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Carrying Value	10,197,025	7,302,273
Fair Value, Measurements, Recurring | U.S. agency debentures
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Carrying Value	2,942,968	3,561,556
Fair Value, Measurements, Recurring | Residential mortgage-backed securities | Agency-issued collateralized mortgage obligations | Fixed rate
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Carrying Value	1,517,702	1,884,843
Fair Value, Measurements, Recurring | Residential mortgage-backed securities | Agency-issued collateralized mortgage obligations | Variable rate
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Carrying Value	645,288	784,475
Fair Value, Measurements, Recurring | Equity securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Carrying Value	4,678	7,508
Fair Value, Measurements, Recurring | Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Carrying Value	10,197,716	7,306,563
Total assets	10,198,495	7,414,814
Total liabilities	0	0
Fair Value, Measurements, Recurring | Level 1 | Noncontrolling Interests
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total assets	600	100,000
Fair Value, Measurements, Recurring | Level 1 | Derivatives designated as hedging instruments | Interest rate risks | Interest rate swaps | Other assets
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value, Assets	0	0
Fair Value, Measurements, Recurring | Level 1 | Derivatives not designated as hedging instruments | Currency exchange risks | Other assets
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value, Assets	0	0
Fair Value, Measurements, Recurring | Level 1 | Derivatives not designated as hedging instruments | Currency exchange risks | Other liability
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value, Liabilities	0	0
Fair Value, Measurements, Recurring | Level 1 | Derivatives not designated as hedging instruments | Other derivative instruments | Equity warrant asset | Other assets
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value, Assets	0	0
Fair Value, Measurements, Recurring | Level 1 | Derivatives not designated as hedging instruments | Other derivative instruments | Client interest rate derivatives | Other assets
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value, Assets	0	0
Fair Value, Measurements, Recurring | Level 1 | Derivatives not designated as hedging instruments | Other derivative instruments | Client interest rate derivatives | Other liability
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value, Liabilities	0	0
Fair Value, Measurements, Recurring | Level 1 | Fair value accounting
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Non-marketable securities	779	108,251
Fair Value, Measurements, Recurring | Level 1 | Fair value accounting | Other venture capital investments
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Non-marketable securities	0	0
Fair Value, Measurements, Recurring | Level 1 | Fair value accounting | Other securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Non-marketable securities	779	108,251
Fair Value, Measurements, Recurring | Level 1 | U.S. treasury securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Carrying Value	10,197,025	7,302,273
Fair Value, Measurements, Recurring | Level 1 | U.S. agency debentures
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Carrying Value	0	0
Fair Value, Measurements, Recurring | Level 1 | Residential mortgage-backed securities | Agency-issued collateralized mortgage obligations | Fixed rate
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Carrying Value	0	0
Fair Value, Measurements, Recurring | Level 1 | Residential mortgage-backed securities | Agency-issued collateralized mortgage obligations | Variable rate
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Carrying Value	0	0
Fair Value, Measurements, Recurring | Level 1 | Equity securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Carrying Value	691	4,290
Fair Value, Measurements, Recurring | Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Carrying Value	5,109,945	6,234,092
Total assets	5,153,513	6,277,384
Total liabilities	34,658	31,111
Fair Value, Measurements, Recurring | Level 2 | Derivatives designated as hedging instruments | Interest rate risks | Interest rate swaps | Other assets
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value, Assets	3,485	4,609
Fair Value, Measurements, Recurring | Level 2 | Derivatives not designated as hedging instruments | Currency exchange risks | Other assets
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value, Assets	33,271	34,231
Fair Value, Measurements, Recurring | Level 2 | Derivatives not designated as hedging instruments | Currency exchange risks | Other liability
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value, Liabilities	28,939	28,363
Fair Value, Measurements, Recurring | Level 2 | Derivatives not designated as hedging instruments | Other derivative instruments | Equity warrant asset | Other assets
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value, Assets	1,648	1,906
Fair Value, Measurements, Recurring | Level 2 | Derivatives not designated as hedging instruments | Other derivative instruments | Client interest rate derivatives | Other assets
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value, Assets	5,164	2,546
Fair Value, Measurements, Recurring | Level 2 | Derivatives not designated as hedging instruments | Other derivative instruments | Client interest rate derivatives | Other liability
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value, Liabilities	5,719	2,748
Fair Value, Measurements, Recurring | Level 2 | Fair value accounting
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Non-marketable securities	0	0
Fair Value, Measurements, Recurring | Level 2 | Fair value accounting | Other venture capital investments
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Non-marketable securities	0	0
Fair Value, Measurements, Recurring | Level 2 | Fair value accounting | Other securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Non-marketable securities	0	0
Fair Value, Measurements, Recurring | Level 2 | U.S. treasury securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Carrying Value	0	0
Fair Value, Measurements, Recurring | Level 2 | U.S. agency debentures
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Carrying Value	2,942,968	3,561,556
Fair Value, Measurements, Recurring | Level 2 | Residential mortgage-backed securities | Agency-issued collateralized mortgage obligations | Fixed rate
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Carrying Value	1,517,702	1,884,843
Fair Value, Measurements, Recurring | Level 2 | Residential mortgage-backed securities | Agency-issued collateralized mortgage obligations | Variable rate
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Carrying Value	645,288	784,475
Fair Value, Measurements, Recurring | Level 2 | Equity securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Carrying Value	3,987	3,218
Fair Value, Measurements, Recurring | Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Carrying Value	0	0
Total assets	131,833	185,902
Total liabilities	0	0
Fair Value, Measurements, Recurring | Level 3 | Noncontrolling Interests
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total assets	3,000	69,000
Fair Value, Measurements, Recurring | Level 3 | Derivatives designated as hedging instruments | Interest rate risks | Interest rate swaps | Other assets
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value, Assets	0	0
Fair Value, Measurements, Recurring | Level 3 | Derivatives not designated as hedging instruments | Currency exchange risks | Other assets
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value, Assets	0	0
Fair Value, Measurements, Recurring | Level 3 | Derivatives not designated as hedging instruments | Currency exchange risks | Other liability
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value, Liabilities	0	0
Fair Value, Measurements, Recurring | Level 3 | Derivatives not designated as hedging instruments | Other derivative instruments | Equity warrant asset | Other assets
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value, Assets	128,443	114,698
Fair Value, Measurements, Recurring | Level 3 | Derivatives not designated as hedging instruments | Other derivative instruments | Client interest rate derivatives | Other assets
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value, Assets	0	0
Fair Value, Measurements, Recurring | Level 3 | Derivatives not designated as hedging instruments | Other derivative instruments | Client interest rate derivatives | Other liability
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value, Liabilities	0	0
Fair Value, Measurements, Recurring | Level 3 | Fair value accounting
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Non-marketable securities	3,390	71,204
Fair Value, Measurements, Recurring | Level 3 | Fair value accounting | Other venture capital investments
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Non-marketable securities	3,390	71,204
Fair Value, Measurements, Recurring | Level 3 | Fair value accounting | Other securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Non-marketable securities	0	0
Fair Value, Measurements, Recurring | Level 3 | U.S. treasury securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Carrying Value	0	0
Fair Value, Measurements, Recurring | Level 3 | U.S. agency debentures
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Carrying Value	0	0
Fair Value, Measurements, Recurring | Level 3 | Residential mortgage-backed securities | Agency-issued collateralized mortgage obligations | Fixed rate
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Carrying Value	0	0
Fair Value, Measurements, Recurring | Level 3 | Residential mortgage-backed securities | Agency-issued collateralized mortgage obligations | Variable rate
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Carrying Value	0	0
Fair Value, Measurements, Recurring | Level 3 | Equity securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Carrying Value	$ 0	$ 0

Fair Value of Financial Instr91

Fair Value of Financial Instruments - Additional Information about Level 3 Assets Measured at Fair Value on a Recurring Basis (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Beginning Balance	$ 123,427	$ 136,706	$ 117,989	$ 451,979
Total Realized and Unrealized Gains Included in Income	11,566	19,351	55,030	163,695
Purchases	0	6,304	0	22,800
Sales	(6,215)	(21,686)	(48,406)	(129,602)
Issuances	3,057	2,932	7,607	9,098
Distributions and Other Settlements	484	(102)	1,234	986
Transfers Out of Level 3	(486)	(6,245)	(1,621)	(381,696)
Ending Balance	131,833	137,260	131,833	137,260
Equity warrant assets | Other assets
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Beginning Balance	120,037	87,151
Total Realized and Unrealized Gains Included in Income	11,551	13,805
Purchases	0	0
Sales	(6,215)	(10,564)
Issuances	3,057	2,932
Distributions and Other Settlements	499	510
Transfers Out of Level 3	(486)	(437)
Ending Balance	128,443	93,397	128,443	93,397
Non-marketable securities | Fair value accounting
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Beginning Balance	3,390	49,555	3,291	352,088
Total Realized and Unrealized Gains Included in Income	15	5,546	146	112,370
Purchases	0	6,304	0	22,800
Sales	0	(11,122)	(32)	(62,401)
Issuances	0	0	0	0
Distributions and Other Settlements	(15)	(612)	(15)	(732)
Transfers Out of Level 3	0	(5,808)	0
Ending Balance	3,390	43,863	3,390	43,863
Non-marketable securities | Fair value accounting | Other venture capital investments
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Beginning Balance	3,390	43,747
Total Realized and Unrealized Gains Included in Income	15	5,546
Purchases	0	6,304
Sales	0	(11,122)
Issuances	0	0
Distributions and Other Settlements	(15)	(612)
Transfers Out of Level 3	0	0		(380,262)
Ending Balance	$ 3,390	43,863	3,390	43,863
Non-marketable securities | Fair value accounting | Other investments
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Beginning Balance		5,808
Total Realized and Unrealized Gains Included in Income		0
Purchases		0
Sales		0
Issuances		0
Distributions and Other Settlements		0
Transfers Out of Level 3		(5,808)
Ending Balance		$ 0		0
Fair Value, Measurements, Recurring | Equity warrant assets | Other assets
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Beginning Balance			114,698	99,891
Total Realized and Unrealized Gains Included in Income			54,884	51,325
Purchases			0	0
Sales			(48,374)	(67,201)
Issuances			7,607	9,098
Distributions and Other Settlements			1,249	1,718
Transfers Out of Level 3			(1,621)	(1,434)
Fair Value, Measurements, Recurring | Non-marketable securities | Fair value accounting | Other venture capital investments
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Beginning Balance			3,291	32,839
Total Realized and Unrealized Gains Included in Income			146	8,060
Purchases			0	22,800
Sales			(32)	(15,561)
Issuances			0	0
Distributions and Other Settlements			(15)	(4,149)
Transfers Out of Level 3			$ 0	(126)
Fair Value, Measurements, Recurring | Non-marketable securities | Fair value accounting | Other investments
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Beginning Balance				319,249
Total Realized and Unrealized Gains Included in Income				104,310
Purchases				0
Sales				(46,840)
Issuances				0
Distributions and Other Settlements				3,417
Transfers Out of Level 3				$ (380,136)

Fair Value of Financial Instr92

Fair Value of Financial Instruments - Unrealized Gains Included in Earnings Attributable to Level 3 Assets Held (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Unrealized Gains (Losses) [Line Items]
Unrealized gains included in earnings attributable to Level 3 assets still held	$ 9,115	$ 5,680	$ 21,755	$ 96,822
Unrealized gains (losses) attributable to noncontrolling interests	0	(1,137)	141	72,574
Equity warrant assets | Other assets
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Unrealized Gains (Losses) [Line Items]
Unrealized gains included in earnings attributable to Level 3 assets still held	9,115	6,911	21,597	17,777
Non-marketable securities | Fair value accounting
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Unrealized Gains (Losses) [Line Items]
Unrealized gains included in earnings attributable to Level 3 assets still held	0	(1,231)	158	79,045
Non-marketable securities | Fair value accounting | Other venture capital investments
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Unrealized Gains (Losses) [Line Items]
Unrealized gains included in earnings attributable to Level 3 assets still held	0	(1,231)	158	78
Non-marketable securities | Fair value accounting | Other investments
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Unrealized Gains (Losses) [Line Items]
Unrealized gains included in earnings attributable to Level 3 assets still held	$ 0	$ 0	$ 0	$ 78,967

Fair Value of Financial Instr93

Fair Value of Financial Instruments - Quantitative Information About Significant Unobservable Inputs (Detail) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Jun. 30, 2015	Dec. 31, 2014	Jun. 30, 2014	Dec. 31, 2013
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Fair value	$ 131,833	$ 137,260	$ 123,427	$ 117,989	$ 136,706	$ 451,979
Equity warrant assets | Other assets
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Fair value	128,443	$ 93,397	$ 120,037		$ 87,151
Level 3 | Other venture capital investments | Fair value accounting
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Fair value	3,390			71,204
Valuation Technique		Private company equity pricing
Level 3 | Equity warrant assets | Investments
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Fair value	$ 4,795			1,681
Level 3 | Equity warrant assets | Other assets
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Valuation Technique		Modified Black-Scholes option pricing model
Volatility	39.40%	42.60%
Risk-Free interest rate	1.50%	1.70%
Sales restrictions discount	14.20%	17.80%
Level 3 | Equity Warrant Asset, Private Portfolio | Investments
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Fair value	$ 123,648			$ 113,017
Level 3 | Equity Warrant Asset, Private Portfolio | Other assets
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Valuation Technique		Modified Black-Scholes option pricing model
Volatility	37.10%	38.30%
Risk-Free interest rate	0.70%	0.90%
Marketability discount	17.30%	20.00%
Remaining life assumption	45.00%	45.00%

Fair Value of Financial Instr94

Fair Value of Financial Instruments - Quantitative Information About Significant Unobservable Inputs (Additional Information) (Detail) - Equity warrant assets	9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014
Other assets
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Weighted average contractual remaining term	5 years 8 months 1 day
Estimated remaining life	2 years 6 months 18 days
Level 3 | Other assets
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Sales restrictions discount	14.20%	17.80%
Lower Limit | Level 3
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Sales restrictions discount	10.00%
Upper Limit | Level 3
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Sales restrictions discount	20.00%

Fair Value of Financial Instr95

Fair Value of Financial Instruments - Additional Information (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Debt Disclosure [Line Items]
Investments transferred out of Level 3	$ 486	$ 6,245	$ 1,621	$ 381,696
Fair value accounting | Non-marketable securities
Debt Disclosure [Line Items]
Investments transferred out of Level 3	$ 0	$ 5,808	$ 0

Fair Value of Financial Instr96

Fair Value of Financial Instruments - Summary of Estimated Fair Values of Financial Instruments not Carried at Fair Value (Detail) - USD ($) $ in Thousands	Sep. 30, 2015	Dec. 31, 2014
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Held-to-maturity securities	$ 8,367,003	$ 7,415,656
Short-term borrowings	3,756	7,781
Other short-term borrowings
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Short-term borrowings	3,756	7,781
3.50% Senior Notes
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Senior Notes	346,591	0
5.375% Senior Notes
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Senior Notes	346,878	346,477
6.05% Subordinated Notes
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Subordinated Notes	49,028	50,040
7.0% Junior Subordinated Debentures
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Junior Subordinated Debentures	54,714	54,845
Carrying Amount
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and cash equivalents	1,674,145	1,796,062
Held-to-maturity securities	8,306,526	7,421,042
Non-marketable securities (cost and equity method accounting) not measured at net asset value	112,984	108,221
Non-marketable securities (cost and equity method) accounting measured at net asset value (1)	253,210	188,427
Net commercial loans	13,470,144	12,947,869
Net consumer loans	1,646,929	1,271,048
FHLB and Federal Reserve Bank stock	46,116	53,496
Accrued interest receivable	98,453	94,180
Non-maturity deposits	36,977,199	34,215,372
Time deposits	72,218	128,127
Accrued interest payable	4,992	6,998
Commitments to extend credit	0	0
Carrying Amount | Other short-term borrowings
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Short-term borrowings	3,756	7,781
Carrying Amount | 3.50% Senior Notes
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Senior Notes	346,591
Carrying Amount | 5.375% Senior Notes
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Senior Notes	346,878	346,477
Carrying Amount | 6.05% Subordinated Notes
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Subordinated Notes	49,028	50,040
Carrying Amount | 7.0% Junior Subordinated Debentures
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Junior Subordinated Debentures	54,714	54,845
Estimated Fair Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and cash equivalents	1,674,145	1,796,062
Held-to-maturity securities	8,367,003	7,415,656
Non-marketable securities (cost and equity method accounting) not measured at net asset value	115,359	107,451
Non-marketable securities (cost and equity method) accounting measured at net asset value (1)	374,353	283,119
Net commercial loans	13,547,022	13,082,487
Net consumer loans	1,618,492	1,247,336
FHLB and Federal Reserve Bank stock	46,116	53,496
Accrued interest receivable	98,453	94,180
Non-maturity deposits	36,977,199	34,215,372
Time deposits	72,218	128,107
Accrued interest payable	4,992	6,998
Commitments to extend credit	28,805	29,097
Estimated Fair Value | Other short-term borrowings
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Short-term borrowings	3,756	7,781
Estimated Fair Value | 3.50% Senior Notes
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Senior Notes	342,125
Estimated Fair Value | 5.375% Senior Notes
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Senior Notes	391,286	392,616
Estimated Fair Value | 6.05% Subordinated Notes
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Subordinated Notes	51,000	53,537
Estimated Fair Value | 7.0% Junior Subordinated Debentures
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Junior Subordinated Debentures	52,557	52,990
Estimated Fair Value | Level 1
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and cash equivalents	1,674,145	1,796,062
Held-to-maturity securities	0	0
Non-marketable securities (cost and equity method accounting) not measured at net asset value	0	0
Net commercial loans	0	0
Net consumer loans	0	0
FHLB and Federal Reserve Bank stock	0	0
Accrued interest receivable	0	0
Non-maturity deposits	36,977,199	34,215,372
Time deposits	0	0
Accrued interest payable	0	0
Commitments to extend credit	0	0
Estimated Fair Value | Level 1 | Other short-term borrowings
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Short-term borrowings	3,756	7,781
Estimated Fair Value | Level 1 | 3.50% Senior Notes
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Senior Notes	0
Estimated Fair Value | Level 1 | 5.375% Senior Notes
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Senior Notes	0	0
Estimated Fair Value | Level 1 | 6.05% Subordinated Notes
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Subordinated Notes	0	0
Estimated Fair Value | Level 1 | 7.0% Junior Subordinated Debentures
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Junior Subordinated Debentures	0	0
Estimated Fair Value | Level 2
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and cash equivalents	0	0
Held-to-maturity securities	8,367,003	7,415,656
Non-marketable securities (cost and equity method accounting) not measured at net asset value	0	0
Net commercial loans	0	0
Net consumer loans	0	0
FHLB and Federal Reserve Bank stock	0	0
Accrued interest receivable	98,453	94,180
Non-maturity deposits	0	0
Time deposits	72,218	128,107
Accrued interest payable	4,992	6,998
Commitments to extend credit	0	0
Estimated Fair Value | Level 2 | Other short-term borrowings
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Short-term borrowings	0	0
Estimated Fair Value | Level 2 | 3.50% Senior Notes
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Senior Notes	342,125
Estimated Fair Value | Level 2 | 5.375% Senior Notes
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Senior Notes	391,286	392,616
Estimated Fair Value | Level 2 | 6.05% Subordinated Notes
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Subordinated Notes	51,000	53,537
Estimated Fair Value | Level 2 | 7.0% Junior Subordinated Debentures
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Junior Subordinated Debentures	52,557	52,990
Estimated Fair Value | Level 3
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and cash equivalents	0	0
Held-to-maturity securities	0	0
Non-marketable securities (cost and equity method accounting) not measured at net asset value	115,359	107,451
Net commercial loans	13,547,022	13,082,487
Net consumer loans	1,618,492	1,247,336
FHLB and Federal Reserve Bank stock	46,116	53,496
Accrued interest receivable	0	0
Non-maturity deposits	0	0
Time deposits	0	0
Accrued interest payable	0	0
Commitments to extend credit	28,805	29,097
Estimated Fair Value | Level 3 | Other short-term borrowings
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Short-term borrowings	0	0
Estimated Fair Value | Level 3 | 3.50% Senior Notes
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Senior Notes	0
Estimated Fair Value | Level 3 | 5.375% Senior Notes
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Senior Notes	0	0
Estimated Fair Value | Level 3 | 6.05% Subordinated Notes
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Subordinated Notes	0	0
Estimated Fair Value | Level 3 | 7.0% Junior Subordinated Debentures
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Junior Subordinated Debentures	$ 0	$ 0

Fair Value of Financial Instr97

Fair Value of Financial Instruments - Summary of Estimated Fair Values of Financial Instruments not Carried at Fair Value (Additional Information) (Detail) - USD ($) $ in Millions	Sep. 30, 2015	Dec. 31, 2014
3.50% Senior Notes
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Interest rate on debt	3.50%
5.375% Senior Notes
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Interest rate on debt	5.375%	5.375%
6.05% Subordinated Notes
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Interest rate on debt	6.05%	6.05%
Fair value of the interest rate swap associated with the notes	$ 3.5	$ 4.6
7.0% Junior Subordinated Debentures
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Interest rate on debt	7.00%	7.00%

Fair Value of Financial Instr98

Fair Value of Financial Instruments - Summary of Estimated Fair Values of Investments and Remaining Unfunded Commitments for Each Major Category of Investments (Detail) $ in Thousands	Sep. 30, 2015USD ($)
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]
Carrying Amount	$ 407,870
Fair Value	529,013
Unfunded Commitments	26,134
Non-marketable securities | Fair value accounting | Venture capital and private equity fund investments
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]
Carrying Amount	154,660
Fair Value	154,660
Unfunded Commitments	10,878
Non-marketable securities | Equity method accounting | Venture capital and private equity fund investments
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]
Carrying Amount	84,197
Fair Value	84,197
Unfunded Commitments	4,989
Non-marketable securities | Equity method accounting | Debt funds
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]
Carrying Amount	21,217
Fair Value	22,326
Unfunded Commitments	0
Non-marketable securities | Equity method accounting | Other investments
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]
Carrying Amount	24,246
Fair Value	24,246
Unfunded Commitments	886
Non-marketable securities | Cost method accounting | Venture capital and private equity fund investments
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]
Carrying Amount	123,550
Fair Value	243,584
Unfunded Commitments	$ 9,381

Fair Value of Financial Instr99

Fair Value of Financial Instruments - Summary of Estimated Fair Values of Investments and Remaining Unfunded Commitments for Each Major Category of Investments (Textual) (Detail) $ in Thousands	9 Months Ended
	Sep. 30, 2015USD ($)
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]
Fair Value	$ 529,013
Unfunded Commitments	26,134
Non-marketable securities | Fair value accounting | Venture capital and private equity fund investments
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]
Fair Value	154,660
Unfunded Commitments	$ 10,878
Non-marketable securities | Fair value accounting | Venture capital and private equity fund investments | Lower Limit
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]
Period distributions from fund investments to be received	10 years
Non-marketable securities | Fair value accounting | Venture capital and private equity fund investments | Upper Limit
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]
Period distributions from fund investments to be received	13 years
Non-marketable securities | Fair value accounting | Venture capital and private equity fund investments | Noncontrolling Interests
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]
Fair Value	$ 111,000
Unfunded Commitments	8,000
Non-marketable securities | Equity method accounting | Venture capital and private equity fund investments
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]
Fair Value	84,197
Unfunded Commitments	$ 4,989
Non-marketable securities | Equity method accounting | Venture capital and private equity fund investments | Lower Limit
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]
Period distributions from fund investments to be received	10 years
Non-marketable securities | Equity method accounting | Venture capital and private equity fund investments | Upper Limit
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]
Period distributions from fund investments to be received	13 years
Non-marketable securities | Equity method accounting | Other investments
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]
Fair Value	$ 24,246
Unfunded Commitments	886
Non-marketable securities | Cost method accounting | Venture capital and private equity fund investments
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]
Fair Value	243,584
Unfunded Commitments	$ 9,381