| Document and Entity Information | Apr. 22, 2021 |
| Entity Information [Line Items] | |
| Entity Registrant Name | SVB Financial Group |
| Document Type | 8-K |
| Document Period End Date | Apr. 22, 2021 |
| Entity Incorporation, State or Country Code | DE |
| Entity File Number | 001-39154 |
| Entity Tax Identification Number | 91-1962278 |
| Entity Address, Address Line One | 3003 Tasman Drive |
| Entity Address, City or Town | Santa Clara |
| Entity Address, State or Province | CA |
| Entity Address, Postal Zip Code | 95054-1191 |
| City Area Code | 408 |
| Local Phone Number | 654-7400 |
| Written Communications | false |
| Soliciting Material | false |
| Pre-commencement Tender Offer | false |
| Pre-commencement Issuer Tender Offer | false |
| Entity Emerging Growth Company | false |
| Entity Central Index Key | 0000719739 |
| Amendment Flag | false |
| Common Stock | |
| Entity Information [Line Items] | |
| Title of 12(b) Security | Common Stock, par value $0.001 per share |
| Trading Symbol | SIVB |
| Security Exchange Name | NASDAQ |
| Preferred Stock, Series A | |
| Entity Information [Line Items] | |
| Title of 12(b) Security | Depositary shares, each representing a 1/40th interest in a share of 5.250% Fixed-Rate Non-Cumulative Perpetual Preferred Stock, Series A |
| Trading Symbol | SIVBP |
| Security Exchange Name | NASDAQ |
