Variable Interest Entities - Carrying Amounts and Classification of Significant Variable Interests (Details)(Details) - USD ($) $ in Thousands		Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013	[1]	Dec. 31, 2012
Variable Interest Entity [Line Items]
Cash and cash equivalents		$ 1,503,257	$ 1,796,062	$ 1,538,779		$ 1,008,983
Non-marketable and other securities	[2],[3]	674,946	1,728,140
Accrued interest receivable and other assets	[3]	709,707	553,208
Total assets		44,686,703	39,337,869
Other liabilities		639,094	483,493
Total liabilities		41,353,472	$ 35,286,135
Maximum Exposure to Loss in Unconsolidated VIEs		364,450
Variable Interest Entity, Primary Beneficiary
Variable Interest Entity [Line Items]
Cash and cash equivalents		11,811
Non-marketable and other securities		203,714
Accrued interest receivable and other assets		494
Total assets		216,019
Other liabilities		433
Accrued expenses and other liabilities		0
Total liabilities		433
Maximum Exposure to Loss in Unconsolidated VIEs		215,600
Variable Interest Entity, Not Primary Beneficiary
Variable Interest Entity [Line Items]
Non-marketable and other securities		364,450
Total assets		364,450
Accrued expenses and other liabilities		90,978
Total liabilities		$ 90,978

[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.

[2] During the second quarter of 2015 we adopted new accounting guidance related to our consolidated variable interest entities (ASU 2015-02). Amounts prior to January 1, 2015 have not been revised for the adoption of this guidance. See Note 2— "Summary of Significant Accounting Policies” of the “Notes to the Consolidated Financial Statements” under Part II, Item 8 of this report for additional details.

[3] Prior period amounts have been revised to reflect the retrospective application of new accounting guidance adopted in the first quarter of 2015 related to our investments in qualified affordable housing projects (ASU 2014-01). See Note 2— "Summary of Significant Accounting Policies” of the “Notes to the Consolidated Financial Statements” under Part II, Item 8 of this report for additional details.