Parent Company Only Condensed Financial Information Condensed Balance Sheet (Detail) - USD ($) $ in Thousands		Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013		Dec. 31, 2012
Assets:
Cash and cash equivalents		$ 1,503,257	$ 1,796,062	$ 1,538,779	[1]	$ 1,008,983
Investment securities		25,846,657	22,689,837
Net loans		16,524,457	14,218,917
Other assets	[2]	709,707	553,208
Total assets		44,686,703	39,337,869
Liabilities and total equity
Other liabilities		639,094	483,493
Total liabilities		41,353,472	35,286,135
SVBFG stockholders' equity		3,198,134	2,813,072
Total liabilities and total equity		44,686,703	39,337,869
Parent Company
Assets:
Cash and cash equivalents		377,013	314,236	$ 218,148		$ 169,067
Investment securities		250,257	229,604
Net loans		9,859	16,684
Other assets		224,748	154,680
Total assets		4,027,818	3,264,173
Liabilities and total equity
Other liabilities		81,332	49,779
Total liabilities		829,684	451,101
SVBFG stockholders' equity		3,198,134	2,813,072
Total liabilities and total equity		4,027,818	3,264,173
Parent Company | 3.50% Senior Notes
Liabilities and total equity
Notes payable		346,667	0
Parent Company | 5.375% Senior Notes
Liabilities and total equity
Notes payable		347,016	346,477
Parent Company | 7.0% Junior Subordinated Debentures
Liabilities and total equity
Notes payable		54,669	54,845
Parent Company | Bank Subsidiaries
Assets:
Investment in subsidiaries		3,059,045	2,399,411
Parent Company | Nonbank Subsidiaries
Assets:
Investment in subsidiaries		$ 106,896	$ 149,558

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

[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 2— "Summary of Significant Accounting Policies” of the “Notes to the Consolidated Financial Statements” under Part II, Item 8 of this report for additional details.