Off-Balance Sheet Arrangements, Guarantees and Other Commitments - Total Capital Commitments, Unfunded Capital Commitments, and Our Ownership in Each Fund (Detail) - Jun. 30, 2015 - USD ($) $ in Thousands	Total
Venture Capital and Private Equity Fund Investments [Line Items]
SVBFG Unfunded Commitments	$ 10,949
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	3,949
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	487,703
SVBFG Unfunded Commitments	25,727
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	178
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	$ 73,807
SVBFG Unfunded Commitments	0
Parent Company | Other fund investments
Venture Capital and Private Equity Fund Investments [Line Items]
SVBFG Capital Commitments	301,011
SVBFG Unfunded Commitments	$ 18,439