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Investment Securities - Major Components of Investment Securities Portfolio (Detail) (USD $)
In Thousands, unless otherwise specified
Sep. 30, 2013
Dec. 31, 2012
Investment Holdings [Line Items]    
Amortized Cost $ 10,186,861 $ 11,152,150
Unrealized Gains 106,304 192,960
Unrealized Losses (83,248) (1,933)
Carrying Value 10,209,917 11,343,177
Non-marketable and other securities 1,425,138 1,184,265
Total investment securities 11,635,055 12,527,442
Fair value accounting | Venture capital and private equity fund investments
   
Investment Holdings [Line Items]    
Non-marketable securities 773,499 [1] 665,921 [1]
Fair value accounting | Other venture capital investments
   
Investment Holdings [Line Items]    
Non-marketable securities 55,359 [2] 127,091 [2]
Fair value accounting | Other Securities [Member]
   
Investment Holdings [Line Items]    
OtherSecuritiesFairValueAccounting 219,600 [3] 0 [3]
Equity method accounting | Other investments
   
Investment Holdings [Line Items]    
Non-marketable securities 142,571 [4] 139,330 [4]
Equity method accounting | Low income housing tax credit funds
   
Investment Holdings [Line Items]    
Non-marketable securities 70,092 70,318
Cost method accounting | Venture capital and private equity fund investments
   
Investment Holdings [Line Items]    
Non-marketable securities 149,602 [5] 161,884 [5]
Cost method accounting | Other investments
   
Investment Holdings [Line Items]    
Non-marketable securities 14,415 19,721
U.S. treasury securities
   
Investment Holdings [Line Items]    
Amortized Cost 0 25,057
Unrealized Gains 0 190
Unrealized Losses 0 0
Carrying Value 0 25,247
U.S. agency debentures
   
Investment Holdings [Line Items]    
Amortized Cost 3,602,585 3,370,455
Unrealized Gains 46,412 77,173
Unrealized Losses (24,177) 0
Carrying Value 3,624,820 3,447,628
Residential mortgage-backed securities | Agency-issued mortgage-backed securities
   
Investment Holdings [Line Items]    
Amortized Cost 1,493,666 1,428,682
Unrealized Gains 28,013 44,858
Unrealized Losses (2,981) (107)
Carrying Value 1,518,698 1,473,433
Residential mortgage-backed securities | Agency-issued collateralized mortgage obligations | Fixed rate
   
Investment Holdings [Line Items]    
Amortized Cost 3,269,966 4,063,020
Unrealized Gains 21,699 41,949
Unrealized Losses (44,188) (995)
Carrying Value 3,247,477 4,103,974
Residential mortgage-backed securities | Agency-issued collateralized mortgage obligations | Variable rate
   
Investment Holdings [Line Items]    
Amortized Cost 1,286,547 1,760,551
Unrealized Gains 3,452 12,201
Unrealized Losses (149) (4)
Carrying Value 1,289,850 1,772,748
Agency-issued commercial mortgage-backed securities
   
Investment Holdings [Line Items]    
Amortized Cost 445,336 416,487
Unrealized Gains 1,381 6,100
Unrealized Losses (10,785) (489)
Carrying Value 435,932 422,098
Municipal bonds and notes
   
Investment Holdings [Line Items]    
Amortized Cost 82,039 85,790
Unrealized Gains 4,540 7,750
Unrealized Losses 0 (11)
Carrying Value 86,579 93,529
Equity securities
   
Investment Holdings [Line Items]    
Amortized Cost 6,722 2,108
Unrealized Gains 807 2,739
Unrealized Losses (968) (327)
Carrying Value $ 6,561 $ 4,520
[1] The following table shows the amounts of venture capital and private equity fund investments held by the following consolidated funds and our ownership percentage of each fund at September 30, 2013 and December 31, 2012 (fair value accounting): September 30, 2013 December 31, 2012(Dollars in thousands) Amount Ownership % Amount Ownership %SVB Strategic Investors Fund, LP $30,265 12.6% $32,850 12.6%SVB Strategic Investors Fund II, LP 96,595 8.6 91,294 8.6SVB Strategic Investors Fund III, LP 226,123 5.9 209,696 5.9SVB Strategic Investors Fund IV, LP 209,368 5.0 169,931 5.0Strategic Investors Fund V Funds 89,410 Various 40,622 VariousStrategic Investors Fund VI Funds 4,681 0.2 — —SVB Capital Preferred Return Fund, LP 55,721 20.0 53,643 20.0SVB Capital—NT Growth Partners, LP 55,836 33.0 60,120 33.0SVB Capital Partners II, LP (i) 716 5.1 1,303 5.1Other private equity fund (ii) 4,784 58.2 6,462 58.2Total venture capital and private equity fund investments $773,499 $665,921 (i)At September 30, 2013, we had a direct ownership interest of 1.3 percent and an indirect ownership interest of 3.8 percent in the fund through our ownership interest of SVB Strategic Investors Fund II, LP.(ii)At September 30, 2013, we had a direct ownership interest 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.
[2] The following table shows the amounts of other venture capital investments held by the following consolidated funds and our ownership percentage of each fund at September 30, 2013 and December 31, 2012 (fair value accounting): September 30, 2013 December 31, 2012(Dollars in thousands) Amount Ownership % Amount Ownership %Silicon Valley BancVentures, LP $7,383 10.7% $43,493 10.7%SVB Capital Partners II, LP (i) 43,682 5.1 79,761 5.1SVB Capital Shanghai Yangpu Venture Capital Fund 4,294 6.8 3,837 6.8Total other venture capital investments $55,359 $127,091 (i)At September 30, 2013, we had a direct ownership interest of 1.3 percent and an indirect ownership interest of 3.8 percent in the fund through our ownership of SVB Strategic Investors Fund II, LP.
[3] Investments classified as other securities (fair value accounting) represent certain direct equity investments in public companies held by our consolidated funds.
[4] The following table shows the carrying value and our ownership percentage of each investment at September 30, 2013 and December 31, 2012 (equity method accounting): September 30, 2013 December 31, 2012(Dollars in thousands) Amount Ownership % Amount Ownership %Gold Hill Venture Lending 03, LP (i) $8,734 9.3% $9,413 9.3%Gold Hill Capital 2008, LP (ii) 21,318 15.5 20,893 15.5China Joint Venture investment 80,346 50.0 78,545 50.0Other investments 32,173 Various 30,479 VariousTotal other investments (equity method accounting) $142,571 $139,330 (i)At September 30, 2013, we had a direct ownership interest of 4.8 percent in the fund and an indirect interest in the fund through our investment in Gold Hill Venture Lending Partners 03, LLC (“GHLLC”) of 4.5 percent. (ii)At September 30, 2013, 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.
[5] Represents investments in 293 and 324 funds (primarily venture capital funds) at September 30, 2013 and December 31, 2012, 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. For the three months ended September 30, 2013, we recognized OTTI losses of $0.4 million resulting from other-than-temporary declines in value for 12 of the 293 investments. For the nine months ended September 30, 2013, we recognized OTTI losses of $1.2 million resulting from other-than-temporary declines in value for 37 of the investments. The OTTI losses are included in net gains on investment securities, a component of noninterest income. We concluded that any declines in value for the remaining investments were temporary and as such, no OTTI was required to be recognized. At September 30, 2013, the carrying value of these venture capital and private equity fund investments (cost method accounting) was $150 million, and the estimated fair value was $206 million.