Parent Company Only Condensed Financial Information Condensed Balance Sheet (Detail) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014		Dec. 31, 2013
Assets:
Cash and cash equivalents	$ 2,545,750	$ 1,503,257	$ 1,811,014	[1]	$ 1,538,779
Investment securities	21,669,961	25,846,657
Net loans	19,674,578	16,524,457
Other assets	672,688	709,707
Total assets	44,683,660	44,686,703
Liabilities and total equity
Other liabilities	618,383	639,094
Total liabilities	40,906,623	41,353,472
SVBFG stockholders' equity	3,642,554	3,198,134
Total liabilities and total equity	44,683,660	44,686,703
Parent Company
Assets:
Cash and cash equivalents	500,014	377,013	$ 314,236		$ 218,148
Investment securities	244,603	250,257
Net loans	13,337	9,859
Other assets	197,220	224,748
Total assets	4,492,529	4,027,818
Liabilities and total equity
Other liabilities	100,917	81,332
Total liabilities	849,975	829,684
SVBFG stockholders' equity	3,642,554	3,198,134
Total liabilities and total equity	4,492,529	4,027,818
Parent Company | 3.50% Senior Notes
Liabilities and total equity
Notes payable	346,979	346,667
Parent Company | 5.375% Senior Notes
Liabilities and total equity
Notes payable	347,586	347,016
Parent Company | 7.0% Junior Subordinated Debentures
Liabilities and total equity
Notes payable	54,493	54,669
Parent Company | Bank Subsidiaries
Assets:
Investment in subsidiaries	3,423,427	3,059,045
Parent Company | Nonbank Subsidiaries
Assets:
Investment in subsidiaries	$ 113,928	$ 106,896

[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.