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Investment Securities - Major Components of Investment Securities Portfolio (Detail) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2014
Dec. 31, 2013
Investment Holdings [Line Items]    
Amortized Cost $ 12,882,413 $ 12,055,524
Unrealized Gains 97,222 91,695
Unrealized Losses (136,536) (160,398)
Carrying Value 12,843,099 11,986,821
Non-marketable and other securities 1,770,456 1,595,494
Total investment securities 14,613,555 13,582,315
Fair value accounting | Venture capital and private equity fund investments
   
Investment Holdings [Line Items]    
Non-marketable securities 976,922 [1] 862,972 [1]
Fair value accounting | Other venture capital investments
   
Investment Holdings [Line Items]    
Non-marketable securities 28,306 [2] 32,839 [2]
Fair value accounting | Other securities
   
Investment Holdings [Line Items]    
Non-marketable securities 381,928 [3] 321,374 [3]
Equity method accounting | Other investments
   
Investment Holdings [Line Items]    
Non-marketable securities 144,636 [4] 142,883 [4]
Equity method accounting | Low income housing tax credit funds
   
Investment Holdings [Line Items]    
Non-marketable securities 84,463 72,241
Cost method accounting | Venture capital and private equity fund investments
   
Investment Holdings [Line Items]    
Non-marketable securities 140,374 [5] 148,994 [5]
Cost method accounting | Other investments
   
Investment Holdings [Line Items]    
Non-marketable securities 13,827 14,191
U.S. treasury securities
   
Investment Holdings [Line Items]    
Amortized Cost 688,253 0
Unrealized Gains 0 0
Unrealized Losses (4,734) 0
Carrying Value 683,519 0
U.S. agency debentures
   
Investment Holdings [Line Items]    
Amortized Cost 4,106,269 4,344,652
Unrealized Gains 39,175 41,365
Unrealized Losses (26,808) (40,785)
Carrying Value 4,118,636 4,345,232
Residential mortgage-backed securities | Agency-issued mortgage-backed securities
   
Investment Holdings [Line Items]    
Amortized Cost 3,003,393 2,472,528
Unrealized Gains 26,130 17,189
Unrealized Losses (8,504) (16,141)
Carrying Value 3,021,019 2,473,576
Residential mortgage-backed securities | Agency-issued collateralized mortgage obligations | Fixed rate
   
Investment Holdings [Line Items]    
Amortized Cost 3,280,209 3,386,670
Unrealized Gains 23,459 24,510
Unrealized Losses (68,664) (85,422)
Carrying Value 3,235,004 3,325,758
Residential mortgage-backed securities | Agency-issued collateralized mortgage obligations | Variable rate
   
Investment Holdings [Line Items]    
Amortized Cost 1,108,079 1,183,333
Unrealized Gains 3,294 3,363
Unrealized Losses (55) (123)
Carrying Value 1,111,318 1,186,573
Agency-issued commercial mortgage-backed securities
   
Investment Holdings [Line Items]    
Amortized Cost 577,086 581,475
Unrealized Gains 399 552
Unrealized Losses (17,820) (17,423)
Carrying Value 559,665 564,604
Municipal bonds and notes
   
Investment Holdings [Line Items]    
Amortized Cost 81,635 82,024
Unrealized Gains 4,437 4,024
Unrealized Losses 0 (21)
Carrying Value 86,072 86,027
Equity securities
   
Investment Holdings [Line Items]    
Amortized Cost 37,489 4,842
Unrealized Gains 328 692
Unrealized Losses (9,951) (483)
Carrying Value $ 27,866 $ 5,051
[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 March 31, 2014 and December 31, 2013 (fair value accounting): March 31, 2014 December 31, 2013(Dollars in thousands) Amount Ownership % Amount Ownership %SVB Strategic Investors Fund, LP $27,134 12.6% $29,104 12.6%SVB Strategic Investors Fund II, LP 97,960 8.6 96,185 8.6SVB Strategic Investors Fund III, LP 264,661 5.9 260,272 5.9SVB Strategic Investors Fund IV, LP 291,989 5.0 226,729 5.0Strategic Investors Fund V Funds 159,794 Various 118,181 VariousStrategic Investors Fund VI Funds 9,871 0.2 7,944 0.2SVB Capital Preferred Return Fund, LP 60,159 20.0 59,028 20.0SVB Capital—NT Growth Partners, LP 61,230 33.0 61,126 33.0SVB Capital Partners II, LP (i) 595 5.1 708 5.1Other private equity fund (ii) 3,529 58.2 3,695 58.2Total venture capital and private equity fund investments $976,922 $862,972 (i)At March 31, 2014, 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 March 31, 2014, 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 March 31, 2014 and December 31, 2013 (fair value accounting): March 31, 2014 December 31, 2013(Dollars in thousands) Amount Ownership % Amount Ownership %Silicon Valley BancVentures, LP $6,520 10.7% $6,564 10.7%SVB Capital Partners II, LP (i) 17,696 5.1 22,684 5.1SVB Capital Shanghai Yangpu Venture Capital Fund 4,090 6.8 3,591 6.8Total other venture capital investments $28,306 $32,839 (i)At March 31, 2014, 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 direct equity investments in public companies held by our consolidated funds. This amount primarily includes total unrealized gains of $351 million in two of our public portfolio companies, FireEye, Inc. ("FireEye") and Twitter, Inc. ("Twitter"), of which one portfolio company, FireEye, is currently subject to a lock-up agreement. The extent to which any unrealized gains will become realized is subject to a variety of factors, including, among other things, the expiration of certain sales restrictions to which FireEye securities are subject, the actual sales of the securities and the timing of such actual sales.
[4] The following table shows the carrying value and our ownership percentage of each investment at March 31, 2014 and December 31, 2013 (equity method accounting): March 31, 2014 December 31, 2013(Dollars in thousands) Amount Ownership % Amount Ownership %Gold Hill Venture Lending 03, LP (i) $10,380 9.3% $7,900 9.3%Gold Hill Capital 2008, LP (ii) 21,076 15.5 21,867 15.5China Joint Venture investment 79,765 50.0 79,940 50.0Other investments 33,415 Various 33,176 VariousTotal other investments (equity method accounting) $144,636 $142,883
[5] Represents investments in 282 and 288 funds (primarily venture capital funds) at March 31, 2014 and December 31, 2013, 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 $140 million, and $222 million, respectively, as of March 31, 2014. The carrying value, and estimated fair value, of these venture capital and private equity fund investments (cost method accounting) was $149 million and $215 million, respectively, as of December 31, 2013.