Recently Issued Accounting Guidance (Policies)	9 Months Ended
Recently Issued Accounting Guidance (Policies)	Sep. 30, 2016
Prospective Adoption Of New Accounting Pronouncements [Abstract]
Nature Of Operations	Nature of Operations Stifel Financial Corp. (the “Company”), through its wholly owned subsidiaries, is principally engaged in retail brokerage; securities trading; investment banking; investment advisory; retail, consumer, and commercial banking; and related financial services. We have offices throughout the United States and Europe. Our major geographic area of concentration is throughout the United States, with a growing presence in Europe. Our company’s principal customers are individual investors, corporations, municipalities, and institutions. On January 4, 2016, the Company completed the acquisition of Eaton Partners, LLC (“Eaton Partners”), a global fund placement and advisory firm. Eaton Partners will retain its brand name and will be run as a Stifel company. The acquisition was funded with cash from operations and our common stock. On May 5, 2016, the Company completed the acquisition of ISM Capital LLP (“ISM”), an independent investment bank focused on international debt capital markets. The acquisition of ISM adds to the Company’s debt capital markets origination, sales and research capabilities in Europe, including an end-to-end platform for convertible securities and other equity-linked debt instruments. The acquisition was funded with cash from operations.
Basis Of Presentation	Basis of Presentation The consolidated financial statements include Stifel Financial Corp. and its wholly owned subsidiaries, principally Stifel, Nicolaus & Company, Incorporated (“Stifel”), Keefe, Bruyette & Woods, Inc., and Stifel Bank & Trust (“Stifel Bank”). All material intercompany balances and transactions have been eliminated. Unless otherwise indicated, the terms “we,” “us,” “our,” or “our company” in this report refer to Stifel Financial Corp. and its wholly owned subsidiaries. We have prepared the accompanying unaudited consolidated financial statements pursuant to the rules and regulations of the Securities and Exchange Commission (the “SEC”). Pursuant to these rules and regulations, we have omitted certain information and footnote disclosures we normally include in our annual consolidated financial statements prepared in accordance with U.S. generally accepted accounting principles. In management’s opinion, we have made all adjustments (consisting only of normal, recurring adjustments, except as otherwise noted) necessary to fairly present our financial position, results of operations and cash flows. Our interim period operating results do not necessarily indicate the results that may be expected for any other interim period or for the full fiscal year. These financial statements and accompanying notes should be read in conjunction with the consolidated financial statements and the notes thereto in our Annual Report on Form 10-K for the year ended December 31, 2015 on file with the SEC. Certain amounts from prior periods have been reclassified to conform to the current period’s presentation. The effect of these reclassifications on our company’s previously reported consolidated financial statements was not material. There have been no material changes in our significant accounting policies, as compared to the significant accounting policies described in our Annual Report on Form 10-K for the year ended December 31, 2015.
Financial Instruments Credit Losses	Financial Instruments – Credit Losses In June 2016, the Financial Accounting Standards Board (“FASB”) issued Accounting Standards Update (“ASU”) No. 2016-13, “Financial Instruments - Credit Losses (Topic 326): Measurement of Credit Losses on Financial Instruments.” For trade receivables, loans, and held-to-maturity debt securities, the current probable loss recognition methodology is being replaced by an expected credit loss model. For available-for-sale debt securities, the recognition model on credit losses is generally unchanged, except the losses will be presented as an adjustable allowance. The guidance is effective for fiscal years beginning after December 15, 2019 (January 1, 2020 for our Company), including interim periods within that reporting period. Early adoption is permitted for annual periods beginning after December 15, 2018. We are currently evaluating the effect that the new guidance will have on our consolidated financial statements.
Share Based Payments	Share-Based Payments In March 2016, the FASB issued ASU No. 2016-09, “Improvements to Employee Share-Based Payment Accounting” (“ASU 2016-09”) that requires an entity to record all excess tax benefits and tax deficiencies as an income tax benefit or expense in the income statement. ASU 2016-09 will also require an entity to elect an accounting policy to either estimate the number of forfeitures or account for forfeitures when they occur. The guidance is effective for fiscal years beginning after December 15, 2016 (January 1, 2017 for our company). We are currently evaluating the effect that the new guidance will have on our consolidated financial statements.
Leases	Leases In February 2016, the FASB issued ASU No. 2016-02, “Leases” that requires lessees to recognize a right-of-use asset and a lease liability on the balance sheet for all leases with the exception of short-term leases. For lessees, leases will continue to be classified as either operating or finance leases in the income statement. Lessor accounting is similar to the current model but updated to align with certain changes to the lessee model. Lessors will continue to classify leases as operating, direct financing or sales-type leases. The new standard must be adopted using a modified retrospective transition and requires application of the new guidance at the beginning of the earliest comparative period presented. The guidance is effective for fiscal years beginning after December 15, 2018 (January 1, 2019 for our company). Early adoption is permitted. We are currently evaluating the transition method that will be elected and the effect that the new guidance will have on our consolidated financial statements.
Financial Assets and Financial Liabilities	Financial Assets and Financial Liabilities In January 2016, the FASB issued ASU No. 2016-01, “Recognition and Measurement of Financial Assets and Financial Liabilities” that will change the income statement impact of equity investments held by an entity, and the recognition of changes in fair value of financial liabilities when the fair value option is elected. The guidance is effective for fiscal years beginning after December 15, 2017 (January 1, 2018 for our company). We are currently evaluating the effect that the new guidance will have on our consolidated financial statements.
Disclosures for Investments in Certain Entities that Calculate Net Asset Value per Share	Disclosures for Investments in Certain Entities that Calculate Net Asset Value per Share In May 2015, the FASB issued ASU No. 2015-07, “Fair Value Measurement (Topic 820): Disclosures for Investments in Certain Entities That Calculate Net Asset Value per Share (or Its Equivalent)” (“ASU 2015-07”). The guidance removes the requirement to categorize within the fair value hierarchy all investments for which fair value is measured using the net asset value per share practical expedient. The guidance also removes the requirement to make certain disclosures for all investments that are eligible to be measured at fair value using the net asset value per share practical expedient. Rather, those disclosures are limited to investments for which the entity has elected to measure the fair value using that practical expedient. The guidance is effective for fiscal years beginning after December 15, 2015 (January 1, 2016 for our company). See Note 4 – Fair Value Measurements.
Interest - Imputation of Interest	Interest - Imputation of Interest In April 2015, the FASB issued ASU No. 2015-03, “Interest - Imputation of Interest (Subtopic 835-30): Simplifying the Presentation of Debt Issuance Costs” (“ASU 2015-03”). The guidance in ASU 2015-03 requires that debt issuance costs related to a recognized debt liability be presented in the balance sheet as a direct deduction from the carrying amount of that debt liability, consistent with debt discounts. The guidance is effective for fiscal years beginning after December 15, 2015 (January 1, 2016 for our company) and is required to be applied retrospectively to all periods presented beginning in the year of adoption. Upon the adoption of ASU 2015-03 by our company on January 1, 2016, the impact was a reduction in both other assets and senior notes of $9.9 million. In accordance with ASU No. 2015-03, previously reported amounts have been conformed to the current presentation, as reflected in the consolidated statements of financial condition. The impact as of December 31, 2015 was a reduction to both total assets and total liabilities of $9.9 million.
Revenue Recognition	Revenue Recognition In April 2016, the FASB issued ASU No. 2016-10, “Identifying Performance Obligations and Licensing” that amends the revenue guidance in ASU 2014-09 on identifying performance obligations. The effective date of the new guidance will coincide with ASU 2014-09 during the first quarter 2018. We are currently evaluating the effect that the new guidance will have on our consolidated financial statements. In March 2016, the FASB issued ASU No. 2016-08, “Principal versus Agent Considerations (Reporting Revenue Gross versus Net)” (“ASU 2016-08”) that amends the principal versus agent guidance in ASU 2014-09. ASU 2016-08 clarifies that the analysis must focus on whether the entity has control of the goods or services before they are transferred to the customer. ASU 2016-08 also provides additional guidance about how to apply the control principle when services are provided and when goods or services are combined with other goods or services. The effective date of the standard for the Company will coincide with ASU 2014-09 during the first quarter 2018. We are currently evaluating the effect that the new guidance will have on our consolidated financial statements. In May 2014, the FASB issued ASU No. 2014-09, "Revenue from Contracts with Customers (Topic 606)," ("ASU 2014-09") that supersedes current revenue recognition guidance, including most industry-specific guidance. ASU 2014-09 requires a company to recognize revenue when it transfers promised goods or services to customers in an amount that reflects the consideration to which the company expects to be entitled in exchange for those goods and services. The guidance also requires additional disclosures regarding the nature, amount, timing and uncertainty of revenue that is recognized. The FASB has approved a one year deferral of this standard, and this pronouncement is now effective for annual reporting periods beginning after December 15, 2017, including interim periods within that reporting period and is to be applied using one of two retrospective application methods, with early application not permitted. We are currently evaluating the impact the new guidance will have on our consolidated financial statements.