Stifel Financial (SF) 10-K 26 Feb 18 2017 FY Annual report Financial data

Document and Entity Information

Document and Entity Information - USD ($) $ in Billions	12 Months Ended
	Dec. 31, 2017	Feb. 15, 2018	Jun. 30, 2017
Document And Entity Information [Abstract]
Document Type	10-K
Amendment Flag	false
Document Period End Date	Dec. 31, 2017
Document Fiscal Year Focus	2,017
Document Fiscal Period Focus	FY
Trading Symbol	SF
Entity Registrant Name	STIFEL FINANCIAL CORP
Entity Central Index Key	720,672
Current Fiscal Year End Date	--12-31
Entity Filer Category	Large Accelerated Filer
Entity Common Stock, Shares Outstanding		71,850,904
Entity Well-known Seasoned Issuer	No
Entity Voluntary Filers	No
Entity Public Float			$ 3.3
Entity Current Reporting Status	Yes

Consolidated Statements Of Fina

Consolidated Statements Of Financial Condition - USD ($) $ in Thousands		Dec. 31, 2017	Dec. 31, 2016
Assets
Cash and cash equivalents		$ 696,283	$ 912,932
Cash segregated for regulatory purposes		90,802	73,235
Receivables:
Brokerage clients, net		1,384,096	1,415,936
Brokers, dealers, and clearing organizations		459,107	1,024,752
Securities purchased under agreements to resell	[1]	512,220	248,588
Financial instruments owned, at fair value		1,143,684	925,045
Available-for-sale securities, at fair value		3,773,508	3,181,313
Held-to-maturity securities, at amortized cost	[2]	3,698,098	3,038,405
Loans held for sale, at lower of cost or market		226,068	228,588
Bank loans, net		6,947,759	5,591,190
Investments, at fair value		111,379	133,563
Fixed assets, net		155,120	172,828
Goodwill		968,834	962,282
Intangible assets, net		109,627	116,304
Loans and advances to financial advisors and other employees, net		378,124	396,318
Deferred tax assets, net		105,152	225,453
Other assets		624,092	482,624
Total Assets		21,383,953	19,129,356
Payables:
Brokerage clients		828,206	842,014
Brokers, dealers, and clearing organizations		276,302	523,107
Drafts		107,043	94,451
Securities sold under agreements to repurchase	[3]	233,704	268,546
Bank deposits		13,411,935	11,527,483
Financial instruments sold, but not yet purchased, at fair value		778,863	699,032
Accrued compensation		493,973	295,354
Accounts payable and accrued expenses		308,911	400,570
Federal Home Loan Bank advances		745,000	500,000
Borrowings		256,000	377,000
Senior notes		1,014,940	795,891
Debentures to Stifel Financial Capital Trusts		67,500	67,500
Total liabilities		18,522,377	16,390,948
Shareholders’ Equity:
Preferred stock − $1 par value; authorized 3,000,000 shares; 6,000 issued		150,000	150,000
Common stock − $0.15 par value; authorized 97,000,000 shares; issued 71,636,986 and 69,507,842 shares, respectively		10,746	10,426
Additional paid-in-capital		1,733,348	1,840,551
Retained earnings		1,033,526	876,958
Accumulated other comprehensive loss		(26,736)	(39,042)
Stockholders' Equity before adjustment for Treasury Stock		2,900,884	2,838,893
Treasury stock, at cost, 772,302 and 2,866,492 shares, respectively		(39,308)	(100,485)
Total Shareholders’ Equity		2,861,576	2,738,408
Total Liabilities and Shareholders’ Equity		$ 21,383,953	$ 19,129,356
[1]	Collateral received includes securities received by our company from the counterparty. These securities are not included on the consolidated statements of financial condition unless there is an event of default. The fair value of securities pledged as collateral was $509.4 million and $248.5 million at December 31, 2017 and 2016, respectively.
[2]	Held-to-maturity securities are carried in the consolidated statements of financial condition at amortized cost, and the changes in the value of these securities, other than impairment charges, are not reported on the consolidated financial statements.
[3]	Collateral pledged includes the fair value of securities pledged by our company to the counter party. These securities are included on the consolidated statements of financial condition unless we default. Collateral pledged by our company to the counter party includes U.S. government agency securities, U.S. government securities, and corporate fixed income securities with market values of $241.4 million and $299.3 million at December 31, 2017 and 2016, respectively.

Consolidated Statements Of Fin3

Consolidated Statements Of Financial Condition (Parenthetical) - $ / shares	Dec. 31, 2017	Dec. 31, 2016
Statement Of Financial Position [Abstract]
Preferred stock, par value	$ 1	$ 1
Preferred stock, shares authorized	3,000,000	3,000,000
Preferred stock, shares issued	6,000	6,000
Common stock, par value	$ 0.15	$ 0.15
Common stock, shares authorized	97,000,000	97,000,000
Common stock, shares issued	71,636,986	69,507,842
Treasury stock, shares	772,302	2,866,492

Consolidated Statements Of Oper

Consolidated Statements Of Operations - USD ($) shares in Thousands, $ in Thousands		12 Months Ended
		Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Revenues:
Commissions		$ 678,904	$ 729,989	$ 749,536
Principal transactions		396,826	475,428	389,319
Investment banking		726,763	513,034	503,052
Asset management and service fees		702,064	582,789	493,761
Interest		454,381	294,332	179,101
Other income		37,524	46,798	62,224
Total revenues		2,996,462	2,642,370	2,376,993
Interest expense		70,030	66,874	45,399
Net revenues	[1]	2,926,432	2,575,496	2,331,594
Non-interest expenses:
Compensation and benefits		1,958,929	1,726,016	1,568,862
Occupancy and equipment rental		222,708	231,324	207,465
Communications and office supplies		133,493	139,644	130,678
Commissions and floor brokerage		44,132	44,315	42,518
Other operating expenses		297,634	291,615	240,504
Total non-interest expenses		2,656,896	2,432,914	2,190,027
Income before income tax expense		269,536	142,582	141,567
Provision for income taxes		86,665	61,062	49,231
Net income		182,871	81,520	92,336
Preferred dividends		9,375	3,906
Net Income available to common shareholders		$ 173,496	$ 77,614	$ 92,336
Earnings per common share:
Basic		$ 2.53	$ 1.16	$ 1.35
Diluted		$ 2.14	$ 1	$ 1.18
Weighted-average number of common shares outstanding:
Basic		68,562	66,871	68,543
Diluted		81,035	77,563	78,554
Cash dividends declared per common share		$ 0.20
[1]	No individual client accounted for more than 10 percent of total net revenues for the years ended December 31, 2017, 2016, and 2015.

Consolidated Statements Of Comp

Consolidated Statements Of Comprehensive Income - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Statement Of Income And Comprehensive Income [Abstract]
Net income		$ 182,871	$ 81,520	$ 92,336
Other comprehensive income:
Changes in unrealized gains/(losses) on available-for-sale securities, net of tax	[1],[2]	4,730	5,803	1,389
Changes in unrealized gains on cash flow hedging instruments, net of tax	[1],[3]	(320)	7,288	1,088
Foreign currency translation adjustment, net of tax	[1]	7,896	(12,600)	(3,679)
Total other comprehensive income/(loss), net of tax	[1]	12,306	491	(1,202)
Comprehensive income		$ 195,177	$ 82,011	$ 91,134
[1]	Net of taxes of $3.3 million, $0.3 million, and $0.7 million for the years ended December 31, 2017, 2016, and 2015, respectively.
[2]	There were no reclassifications to earnings of realized gains for the years ended December 31, 2017 and 2016. Amounts are net of reclassifications to earnings of realized gains of $2.1 million for the year ended December 31, 2015.
[3]	Amounts are net of reclassifications to earnings of losses of $0.6 million, $5.4 million, and $3.8 million for the years ended December 31, 2017, 2016, and 2015, respectively.

Consolidated Statements Of Com6

Consolidated Statements Of Comprehensive Income (Parenthetical) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Statement Of Income And Comprehensive Income [Abstract]
Changes in unrealized gains (losses) on available-for-sale securities, tax	$ 3.3	$ 0.3	$ 0.7
Reclassifications to earnings of realized gains on available-for-sale securities	0	0	2.1
Reclassifications to earnings of losses on cash flow hedging instruments	$ 0.6	$ 5.4	$ 3.8

Consolidated Statements Of Chan

Consolidated Statements Of Changes In Shareholders' Equity - USD ($) $ in Thousands		Total		Preferred Stock [Member]	Common Stock [Member]	Additional Paid-in Capital [Member]	Retained Earnings [Member]	Accumulated Other Comprehensive Income/(Loss) [Member]	Treasury Stock at Cost [Member]
Balance, beginning of year at Dec. 31, 2014					$ 9,950	$ 1,634,114	$ 716,305	$ (38,331)
Common stock issued under employee plans					266				$ 12,818
Common stock repurchased									(117,752)
Common stock issued for acquisitions					210	79,537
Unit amortization, net of forfeitures						167,848
Net income		$ 92,336					92,336
Common stock issued under employee plans and related tax benefits						(75,468)	(2,956)
Excess tax benefit/(tax deficit) from stock-based compensation	[1]					14,741
Unrealized gains on securities, net of tax								1,389
Unrealized gains/(losses) on cash flow hedging activities, net of tax								1,088
Foreign currency translation adjustment, net of tax		(3,679)	[2]					(3,679)
Balance, end of year at Dec. 31, 2015		2,492,416			10,426	1,820,772	805,685	(39,533)	(104,934)
Common stock issued under employee plans									104,375
Common stock repurchased		(113,500)							(113,462)
Common stock issued for acquisitions						(723)			13,536
Unit amortization, net of forfeitures						189,746
Net income		81,520					81,520
Dividends declared, Preferred							(3,906)
Common stock issued under employee plans and related tax benefits						(159,391)	(6,341)
Excess tax benefit/(tax deficit) from stock-based compensation	[1]					(4,904)
Issuance of preferred stock				$ 150,000		(4,949)
Unrealized gains on securities, net of tax								5,803
Unrealized gains/(losses) on cash flow hedging activities, net of tax								7,288
Foreign currency translation adjustment, net of tax		(12,600)	[2]					(12,600)
Balance, end of year at Dec. 31, 2016		2,738,408		150,000	10,426	1,840,551	876,958	(39,042)	(100,485)
Common stock issued under employee plans					292				74,175
Common stock repurchased		(13,000)							(12,998)
Common stock issued for acquisitions					28	9,324
Unit amortization, net of forfeitures						167,908
Dividends declared to equity-award holders						3,758
Net income		182,871					182,871
Dividends declared, Common							(17,446)
Dividends declared, Preferred							(9,375)
Common stock issued under employee plans and related tax benefits						(288,152)
Other						(41)	518
Unrealized gains on securities, net of tax								4,730
Unrealized gains/(losses) on cash flow hedging activities, net of tax								(320)
Foreign currency translation adjustment, net of tax		7,896	[2]					7,896
Balance, end of year at Dec. 31, 2017		$ 2,861,576		$ 150,000	$ 10,746	$ 1,733,348	$ 1,033,526	$ (26,736)	$ (39,308)
[1]	During the year ended December 31, 2017, we adopted new stock-based compensation guidance. See Note 2 of the Notes to Consolidated Financial Statements for additional information.
[2]	Net of taxes of $3.3 million, $0.3 million, and $0.7 million for the years ended December 31, 2017, 2016, and 2015, respectively.

Consolidated Statements Of Cha8

Consolidated Statements Of Changes In Shareholders' Equity (Parenthetical) - $ / shares	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Statement Of Stockholders Equity [Abstract]
Preferred stock, par value	$ 1	$ 1	$ 1
Common stock, par value	$ 0.15	$ 0.15	$ 0.15

Consolidated Statements Of Cash

Consolidated Statements Of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Cash Flows From Operating Activities:
Net income	$ 182,871	$ 81,520	$ 92,336
Adjustments to reconcile net income to net cash provided by/(used in) operating activities:
Depreciation and amortization	32,495	43,147	36,715
Amortization of loans and advances to financial advisors and other employees	91,594	94,754	53,913
Amortization of premium on investment portfolio	15,837	12,258	2,750
Provision for loan losses and allowance for loans and advances to financial advisors and other employees	25,985	17,793	14,694
Amortization of intangible assets	12,135	14,427	10,423
Deferred income taxes	118,129	46,062	(5,732)
Tax deficit/(excess tax benefits) from stock-based compensation		4,904	(14,741)
Stock-based compensation	140,461	186,303	165,641
(Gain)/losses on sale of investments	(2,359)	5,563	9,255
Gain on extinguishment of Stifel Financial Capital Trust		(5,607)
Other, net	3,037	4,676	(13,159)
Decrease/(increase) in operating assets, net of assets acquired:
Cash segregated for regulatory purposes	(17,567)	153,834	(178,081)
Receivables:
Brokerage clients, net	31,840	177,300	(1,003,257)
Brokers, dealers, and clearing organizations	566,454	(439,601)	82,960
Securities purchased under agreements to resell	(263,632)	(88,165)	(105,345)
Financial instruments owned, including those pledged	(217,386)	(175,602)	90,716
Loans originated as held for sale	(1,564,386)	(2,658,254)	(1,855,714)
Proceeds from mortgages held for sale	1,558,327	2,624,950	1,814,168
Loans and advances to financial advisors and other employees	(72,215)	(92,830)	(187,234)
Other assets	(113,875)	(158,875)	100,670
Increase/(decrease) in operating liabilities, net of liabilities assumed:
Brokerage clients	(13,808)	(158,408)	678,926
Brokers, dealers, and clearing organizations	(79,905)	(62,105)	98,301
Drafts	12,592	(89,406)	108,659
Financial instruments sold, but not yet purchased	79,831	177,288	(65,521)
Other liabilities and accrued expenses	135,894	(3,500)	(193,151)
Net cash provided by/(used in) operating activities	662,349	(287,574)	(261,808)
Cash Flows From Investing Activities:
Maturities, calls, sales, and principal paydowns of available-for-sale securities	985,520	403,951	866,899
Calls and principal paydowns of held-to-maturity securities	370,019	251,439	126,258
Sale or maturity of investments	28,839	40,175	65,320
Sale of bank foreclosed assets			75
Disposition of business, net		21,340
Increase in bank loans, net	(1,374,959)	(2,462,405)	(517,563)
Payments for:
Purchase of available-for-sale securities	(1,583,369)	(1,961,419)	(991,954)
Purchase of held-to-maturity securities	(1,033,700)	(1,437,725)	(802,668)
Purchase of investments	(4,296)	(9,278)	(45,151)
Purchase of fixed assets	(28,217)	(28,211)	(69,822)
Acquisitions, net of cash acquired	(7,220)	(72,383)	(604,659)
Net cash used in investing activities	(2,647,383)	(5,254,516)	(1,973,265)
Cash Flows from Financing Activities:
Proceeds from/(repayments of) short-term borrowings, net	(121,000)	287,916	(126,637)
Proceeds from issuance of senior notes, net	217,913	201,632	297,042
Proceeds from advances from the Federal Home Loan Bank, net	245,000	352,000	148,000
Issuance of preferred stock, net of issuance costs		145,051
Increase/(decrease) in securities sold under agreements to repurchase	(34,842)	(10,128)	239,494
Increase in bank deposits, net	1,884,452	4,889,127	1,848,275
Increase/(decrease) in securities loaned	(166,900)	146,838	325,707
(Tax deficit)/excess tax benefits from stock-based compensation		(4,904)	14,741
Tax payments related to shares withheld for stock-based compensation plans	(214,744)	(61,601)	(65,021)
Proceeds from stock option exercises		543	660
Repurchase of common stock	(12,998)	(113,462)	(117,752)
Cash dividends on preferred stock	(9,375)	(3,906)
Cash dividends paid to common stock and equity-award holders	(13,688)
Extinguishment of Stifel Financial Capital Trust		(9,393)
Repayment of Senior Notes		(150,000)	(175,000)
Contingent consideration	(13,328)	(13,110)	(29,598)
Net cash provided by financing activities	1,760,490	5,656,603	2,359,911
Effect of exchange rate changes on cash	7,895	(12,600)	(3,601)
Increase/(decrease) in cash and cash equivalents	(216,649)	101,913	121,237
Cash and cash equivalents at beginning of year	912,932	811,019	689,782
Cash and cash equivalents at end of year	696,283	912,932	811,019
Supplemental disclosure of cash flow information:
Cash paid for interest	69,781	62,145	41,801
Cash paid for income taxes, net of refunds	21,516	22,946	59,356
Noncash investing and financing activities:
Unit grants, net of forfeitures	71,300	190,211	267,769
Issuance of common stock for acquisitions	$ 9,352	$ 12,813	79,747
Shares surrendered into treasury			$ 223

Nature Of Operations And Basis

Nature Of Operations And Basis Of Presentation	12 Months Ended
	Dec. 31, 2017
Organization Consolidation And Presentation Of Financial Statements [Abstract]
Nature Of Operations And Basis Of Presentation	NOTE 1 – Nature of Operations and Basis of Presentation 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, with a growing presence in Europe. Our major geographic area of concentration is throughout the United States, with a growing presence in the United Kingdom and Europe. Our company’s principal customers are individual investors, corporations, municipalities, and institutions. 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 (“KBW”), and Stifel Bank & Trust (“Stifel Bank”). Unless otherwise indicated, the terms “we,” “us,” “our,” or “our company” in this report refer to Stifel Financial Corp. and its wholly owned subsidiaries. The accompanying consolidated financial statements have been prepared in conformity with U.S. generally accepted accounting principles, which require management to make certain estimates and assumptions that affect the reported amounts. We consider significant estimates, which are most susceptible to change and impacted significantly by judgments, assumptions, and estimates, to be: valuation of financial instruments and investments in partnerships, accrual for contingencies, allowance for loan losses, derivative instruments and hedging activities, fair value of goodwill and intangible assets, provision for income taxes and related tax reserves, and forfeitures associated with stock-based compensation. Actual results could differ from those estimates. 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. Consolidation Policies The consolidated financial statements include the accounts of Stifel Financial Corp. and its subsidiaries. We also have investments or interests in other entities for which we must evaluate whether to consolidate by determining whether we have a controlling financial interest or are considered to be the primary beneficiary. In determining whether to consolidate these entities, we evaluate whether the entity is a voting interest entity or a variable interest entity (“VIE”). When we do not have a controlling interest in an entity, but we exert significant influence over the entity, we apply the equity method of accounting. All material intercompany balances and transactions have been eliminated in consolidation. Voting Interest Entity – Voting interest entities are entities that have (i) total equity investment at risk sufficient to fund expected future operations independently, and (ii) equity holders who have the obligation to absorb losses or receive residual returns and the right to make decisions about the entity’s activities. We consolidate voting interest entities when we determine that there is a controlling financial interest, usually ownership of all, or a majority of, the voting interest. Variable Interest Entity – VIEs are entities that lack one or more of the characteristics of a voting interest entity. We are required to consolidate certain VIEs in which we have the power to direct the activities of the entity and the obligation to absorb significant losses or receive significant benefits. In other cases, we consolidate VIEs when we are deemed to be the primary beneficiary. The primary beneficiary is defined as the entity that has a variable interest, or a combination of variable interests, that maintains control and receives benefits or will absorb losses that are not pro rata with its ownership interests. The determination as to whether an entity is a VIE is based on the structure and nature of the entity. We also consider other characteristics, such as the ability to influence the decision-making relative to the entity’s activities and how the entity is financed. With the exception of entities eligible for the deferral codified in Financial Accounting Standards Board (“FASB”) Accounting Standards Update (“ASU”) 2010-10, “Consolidation: Amendments for Certain Investment Funds” (“ASU 2010-10”) (generally asset managers and investment companies), ASC 810 states that a controlling financial interest in an entity is present when an enterprise has a variable interest, or combination of variable interests, that have both the power to direct the activities of the entity that most significantly impact the entity’s economic performance and the obligation to absorb losses of the entity or the rights to receive benefits from the entity that could potentially be significant to the entity. Entities meeting the deferral provision defined by ASU 2010-10 are evaluated under the historical VIE guidance. Under the historical guidance, a controlling financial interest in an entity is present when an enterprise has a variable interest, or combination of variable interests, that will absorb a majority of the entity’s expected losses, receive a majority of the entity’s expected residual returns, or both. The enterprise with a controlling financial interest, known as the primary beneficiary, consolidates the VIE. We determine whether we are the primary beneficiary of a VIE by first performing a qualitative analysis of the VIE’s control structure, expected benefits and losses, and expected residual returns. This analysis includes a review of, among other factors, the VIE’s capital structure, contractual terms, which interests create or absorb benefits or losses, variability, related party relationships, and the design of the VIE. Where a qualitative analysis is not conclusive, we perform a quantitative analysis. We reassess our initial evaluation of an entity as a VIE and our initial determination of whether we are the primary beneficiary of a VIE upon the occurrence of certain reconsideration events. See Note 27 for additional information on VIEs.

Summary Of Significant Accounti

Summary Of Significant Accounting Policies	12 Months Ended
	Dec. 31, 2017
Accounting Policies [Abstract]
Summary Of Significant Accounting Policies	NOTE 2 – Summary of Significant Accounting Policies Cash and Cash Equivalents We consider money market mutual funds and highly liquid investments with original maturities of three months or less that are not restricted or segregated to be cash equivalents. Cash and cash equivalents include deposits with banks, federal funds sold, money market mutual funds, and certificates of deposit. Cash and cash equivalents also include balances that Stifel Bank maintains at the Federal Reserve Bank. Cash Segregated for Regulatory Purposes Our broker-dealer subsidiaries are subject to Rule 15c3-3 under the Securities Exchange Act of 1934, which requires our company to maintain cash or qualified securities in a segregated reserve account for the exclusive benefit of its clients. In accordance with Rule 15c3-3, our company has portions of its cash segregated for the exclusive benefit of clients at December 31, 2017. Brokerage Client Receivables, Net Brokerage client receivables include receivables of our company’s broker-dealer subsidiaries, which represent amounts due on cash and margin transactions and are generally collateralized by securities owned by clients. Brokerage client receivables, primarily consisting of floating-rate loans collateralized by customer-owned securities, are charged interest at rates similar to other such loans made throughout the industry. The receivables are reported at their outstanding principal balance net of allowance for doubtful accounts. When a brokerage client receivable is considered to be impaired, the amount of the impairment is generally measured based on the fair value of the securities acting as collateral, which is measured based on current prices from independent sources, such as listed market prices or broker-dealer price quotations. Securities owned by customers, including those that collateralize margin or other similar transactions, are not reflected in the consolidated statements of financial condition. Securities Borrowed and Securities Loaned Securities borrowed require our company to deliver cash to the lender in exchange for securities and are included in receivables from brokers, dealers, and clearing organizations in the consolidated statements of financial condition. For securities loaned, we generally receive collateral in the form of cash in an amount in excess of the market value of securities loaned. Securities loaned are included in payables to brokers, dealers, and clearing organizations in the consolidated statements of financial condition. We monitor the market value of securities borrowed and loaned on a daily basis, with additional collateral obtained or refunded as necessary. Fees received or paid are recorded in interest revenue or interest expense in the consolidated statements of operations. Substantially all of these transactions are executed under master netting agreements, which gives us right of offset in the event of counterparty default; however, such receivables and payables with the same counterparty are not set off in the consolidated statements of financial condition. Securities Purchased Under Agreements to Resell and Repurchase Agreements Securities purchased under agreements to resell (“resale agreements”) are collateralized financing transactions that are recorded at their contractual amounts plus accrued interest. We obtain control of collateral with a market value equal to or in excess of the principal amount loaned and accrued interest under resale agreements. These agreements are short-term in nature and are generally collateralized by U.S. government securities, U.S. government agency securities, and corporate bonds. We value collateral on a daily basis, with additional collateral obtained when necessary to minimize the risk associated with this activity. Securities sold under agreements to repurchase (“repurchase agreements”) are collateralized financing transactions that are recorded at their contractual amounts plus accrued interest. We make delivery of securities sold under agreements to repurchase and monitor the value of collateral on a daily basis. When necessary, we will deliver additional collateral. Financial Instruments We measure certain financial assets and liabilities at fair value on a recurring basis, including cash equivalents, financial instruments owned, available-for-sale securities, investments, financial instruments sold, but not yet purchased, and derivatives. Other than those separately discussed in the notes to the consolidated financial statements, the remaining financial instruments are generally short-term in nature, and their carrying values approximate fair value. The fair value of a financial instrument is defined as the price that would be received to sell an asset or paid to transfer a liability (i.e., “the exit price”) in an orderly transaction between market participants at the measurement date. We have categorized our financial instruments measured at fair value into a three-level classification in accordance with Topic 820, “Fair Value Measurement,” Level 1 – Quoted prices (unadjusted) are available in active markets for identical assets or liabilities as of the measurement date. A quoted price for an identical asset or liability in an active market provides the most reliable fair value measurement, because it is directly observable to the market. Level 2 – Pricing inputs are other than quoted prices in active markets, which are either directly or indirectly observable as of the measurement date. The nature of these financial instruments includes instruments for which quoted prices are available but traded less frequently, derivative instruments whose fair value have been derived using a model where inputs to the model are directly observable in the market, or can be derived principally from or corroborated by observable market data, and instruments that are fair valued using other financial instruments, the parameters of which can be directly observed. Level 3 – Instruments that have little to no pricing observability as of the measurement date. These financial instruments do not have two-way markets and are measured using management’s best estimate of fair value, where the inputs into the determination of fair value require significant management judgment or estimation. Valuation of Financial Instruments When available, we use observable market prices, observable market parameters, or broker or dealer prices (bid and ask prices) to derive the fair value of financial instruments. In the case of financial instruments transacted on recognized exchanges, the observable market prices represent quotations for completed transactions from the exchange on which the financial instrument is principally traded. A substantial percentage of the fair value of our financial instruments owned, available-for-sale securities, investments, and financial instruments sold, but not yet purchased, are based on observable market prices, observable market parameters, or derived from broker or dealer prices. The availability of observable market prices and pricing parameters can vary from product to product. Where available, observable market prices and pricing or market parameters in a product may be used to derive a price without requiring significant judgment. In certain markets, observable market prices or market parameters are not available for all products, and fair value is determined using techniques appropriate for each particular product. These techniques involve some degree of judgment. For investments in illiquid or privately held securities that do not have readily determinable fair values, the determination of fair value requires us to estimate the value of the securities using the best information available. Among the factors we consider in determining the fair value of investments are the cost of the investment, terms and liquidity, developments since the acquisition of the investment, the sales price of recently issued securities, the financial condition and operating results of the issuer, earnings trends and consistency of operating cash flows, the long-term business potential of the issuer, the quoted market price of securities with similar quality and yield that are publicly traded, and other factors generally pertinent to the valuation of investments. In instances where a security is subject to transfer restrictions, the value of the security is based primarily on the quoted price of a similar security without restriction but may be reduced by an amount estimated to reflect such restrictions. The fair value of these investments is subject to a high degree of volatility and may be susceptible to significant fluctuation in the near term, and the differences could be material. The degree of judgment used in measuring the fair value of financial instruments generally correlates to the level of pricing observability. Pricing observability is impacted by a number of factors, including the type of financial instrument, whether the financial instrument is new to the market and not yet established, and the characteristics specific to the transaction. Financial instruments with readily available active quoted prices for which fair value can be measured from actively quoted prices generally will have a higher degree of pricing observability and a lesser degree of judgment used in measuring fair value. Conversely, financial instruments rarely traded or not quoted will generally have less, or no, pricing observability and a higher degree of judgment used in measuring fair value. See Note 5 for additional information on how we value our financial instruments. Available-for-Sale and Held-to-Maturity Securities Securities available for sale, which are carried at fair value, include U.S. government agency securities; state and municipal securities; agency, non-agency, and commercial mortgage-backed securities; corporate fixed income securities; and asset-backed securities, which primarily includes collateralized loan obligations. Securities held to maturity are recorded at amortized cost based on our company’s positive intent and ability to hold these securities to maturity. Securities held to maturity include agency, commercial, and non-agency mortgage-backed securities, asset-backed securities, consisting of collateralized loan obligation securities and ARS, and corporate fixed income securities. We evaluate all securities in an unrealized loss position quarterly to assess whether the impairment is other-than-temporary. Our other-than-temporary impairment (“OTTI”) assessment is a subjective process requiring the use of judgments and assumptions. Accordingly, we consider a number of qualitative and quantitative criteria in our assessment, including the extent and duration of the impairment, recent events specific to the issuer and/or industry to which the issuer belongs, the payment structure of the security, external credit ratings and the failure of the issuer to make scheduled interest or principal payments, the value of underlying collateral, current market conditions, and our company’s ability and intent to hold the investment until its value recovers or the securities mature. We may determine that the decline in fair value of an investment is other-than-temporary if our analysis of these factors indicates that we will not recover our investment in the securities. If we determine that impairment on our debt securities is other-than-temporary and we have made the decision to sell the security or it is more likely than not that we will be required to sell the security prior to recovery of its amortized cost basis, we recognize the entire portion of the impairment in earnings. If we have not made a decision to sell the security and we do not expect that we will be required to sell the security prior to recovery of the amortized cost basis, we recognize only the credit component of OTTI in other operating expenses in the consolidated statements of operations. The remaining unrealized loss due to factors other than credit, or the non-credit component, is recorded in accumulated other comprehensive loss. We determine the credit component based on the difference between the security’s amortized cost basis and the present value of its expected future cash flows, discounted based on the purchase yield. The non-credit component represents the difference between the security’s fair value and the present value of expected future cash flows. We estimate the portion of loss attributable to credit using a discounted cash flow model. Key assumptions used in estimating the expected cash flows include default rates, loss severity, and prepayment rates. Assumptions used can vary widely based on the collateral underlying the securities and are influenced by factors such as collateral type, loan interest rate, geographical location of the borrower, and borrower characteristics. Unrealized gains and losses on our available-for-sale securities are reported, net of taxes, in accumulated other comprehensive loss included in shareholders’ equity. Amortization of premiums and accretion of discounts are recorded as interest income in the consolidated statements of operations using the interest method. Realized gains and losses from sales of securities available for sale are determined on a specific identification basis and are included in other income in the consolidated statements of operations in the period they are sold. For securities transferred from available-for-sale to held-to-maturity, carrying value also includes unrealized gains and losses recognized in accumulated other comprehensive loss at the date of transfer. Such unrealized gains or losses are accreted over the remaining life of the security with no impact on future net income. Loan Classification We classify loans based on our investment strategy and management’s assessment of our intent and ability to hold loans for the foreseeable future or until maturity. Management’s intent and ability with respect to certain loans may change from time to time depending on a number of factors, including economic, liquidity, and capital conditions. The accounting and measurement framework for loans differs depending on the loan classification. The classification criteria and accounting and measurement framework for bank loans and loans held for sale are described below. Bank Loans and Allowance for Loan Losses Bank loans consist of commercial and residential mortgage loans, commercial and industrial loans, stock-secured loans, home equity loans, construction loans, and consumer loans originated or acquired by Stifel Bank. Bank loans include those loans that management has the intent and ability to hold and are recorded at outstanding principal adjusted for any charge-offs, allowance for loan losses, deferred origination fees and costs, and purchased discounts. Loan origination costs, net of fees, and premiums and discounts on purchased loans are deferred and recognized over the contractual life of the loan as an adjustment of yield using the interest method. Bank loans are generally collateralized by real estate, real property, marketable securities, or other assets of the borrower. Interest income is recognized using the effective interest rate method, which is based upon the respective interest rates and the average daily asset balance. Discount accretion/premium amortization is recognized using the effective interest rate method, which is based upon the respective interest rate and expected lives of loans. We regularly review the loan portfolio and have established an allowance for loan losses for inherent losses estimated to have occurred in the loan portfolio through a provision for loan losses charged to other operating expenses in the consolidated statements of operations. In providing for the allowance for loan losses, we consider historical loss experience, the nature and volume of the loan portfolio, adverse situations that may affect the borrower’s ability to repay, estimated value of any underlying collateral, and prevailing economic conditions. This evaluation is inherently subjective, as it requires estimates that are susceptible to significant revision as more information becomes available. Loans Held for Sale Loans that we intend to sell or for which we do not have the ability and intent to hold for the foreseeable future are classified as held for sale. Loans held for sale consist of fixed-rate and adjustable-rate residential and multi-family real estate mortgage loans intended for sale. Loans held for sale are stated at lower of cost or market value on an individual loan basis. Declines in market value below cost and any gains or losses on the sale of these assets are recognized in other income in the consolidated statements of operations. Market value is determined based on prevailing market prices for loans with similar characteristics or on sale contract prices. Deferred fees and costs related to these loans are not amortized but are recognized as part of the cost basis of the loan at the time it is sold. Because loans held for sale are reported at lower of cost or market value, an allowance for loan losses is not established for loans held for sale. Impaired Loans A loan is considered impaired when, based on current information and events, it is probable that the scheduled payments of principal or interest when due according to the contractual terms of the loan agreement will not be collectible. Factors considered in determining impairment include payment status, collateral value, and the probability of collecting scheduled principal and interest payments when due. Loans that experience insignificant payment delays and payment shortfalls generally are not classified as impaired. We determine the significance of payment delays and payment shortfalls on a case-by-case basis, taking into consideration all of the circumstances surrounding the loan and the borrower, including the length of the delay, the reasons for the delay, the borrower's prior payment record, and the amount of the shortfall in relation to the principal and interest owed. We consider a loan a trouble debt restructuring when an existing borrower is granted concessionary rates or terms, which would not otherwise be offered. The concessions granted do not reflect current market conditions for a new loan of similar risk to another borrower in similar financial circumstances. Once a loan is determined to be impaired, when principal or interest becomes 90 days past due or when collection becomes uncertain, the accrual of interest and amortization of deferred loan origination fees is discontinued (“non-accrual status”) and any accrued and unpaid interest income is reversed. Loans placed on non-accrual status are returned to accrual status when all delinquent principal and interest payments are collected and the collectibility of future principal and interest payments is reasonably assured. Loan losses are charged against the allowance for loan losses when we believe the uncollectibility of a loan balance is certain. Subsequent recoveries, if any, are credited to the allowance for loan losses. Large groups of smaller balance homogenous loans are collectively evaluated for impairment. Accordingly, we do not separately identify individual consumer and residential loans for impairment measurements. Impairment is measured on a loan-by-loan basis for non-homogeneous loans, and a specific allowance is established for individual loans determined to be impaired. Impairment is measured by comparing the carrying value of the impaired loan to the present value of its expected cash flow discounted at the loan’s effective interest rate, the loan’s observable market price, or the fair value of the collateral if the loan is collateral dependent. Investments Our broker-dealer subsidiaries report changes in fair value of marketable and non-marketable securities in other income in the consolidated statements of operations. The fair value of marketable investments is generally based on either quoted market or dealer prices. The fair value of non-marketable securities is based on management’s estimate using the best information available, which generally consists of quoted market prices for similar securities and internally developed discounted cash flow models. Investments in the consolidated statements of financial condition contain investments in securities that are marketable and securities that are not readily marketable. These investments are not included in our broker-dealer trading inventory or available-for-sale or held-to-maturity portfolios and represent the acquiring and disposing of debt or equity instruments for our benefit. Fixed Assets, Net Office equipment is depreciated on a straight-line basis over the estimated useful life of the asset of two to seven years. Leasehold improvements are amortized on a straight-line basis over the lesser of the estimated useful life of the asset or the term of the lease. Buildings and building improvements are amortized on a straight-line basis over the estimated useful life of the asset of three to thirty-nine years. Depreciation expense is recorded in occupancy and equipment rental expense in the consolidated statements of operations. Office equipment, leasehold improvements, and property are stated at cost net of accumulated depreciation and amortization in the consolidated statements of financial condition. Office equipment is reviewed for impairment whenever events or changes in circumstances indicate that the carrying amount of such assets may not be recoverable. Goodwill and Intangible Assets Goodwill represents the cost of acquired businesses in excess of the fair value of the related net assets acquired. We test goodwill for impairment on an annual basis and on an interim basis when certain events or circumstances exist. We test for impairment at the reporting unit level, which is generally at the level of or one level below our company’s business segments. For both the annual and interim tests, we have the option to first assess qualitative factors to determine whether the existence of events or circumstances leads to a determination that it is more likely than not that the fair value of a reporting unit is less than its carrying amount. If, after assessing the totality of events or circumstances, we determine it is more likely than not that the fair value of a reporting unit is greater than its carrying amount, then performing the two-step impairment test is not required. However, if we conclude otherwise, we are then required to perform the first step of the two-step impairment test. Goodwill impairment is determined by comparing the estimated fair value of a reporting unit with its respective carrying value. If the estimated fair value exceeds the carrying value, goodwill at the reporting unit level is not deemed to be impaired. If the estimated fair value is below carrying value, however, further analysis is required to determine the amount of the impairment. Additionally, if the carrying value of a reporting unit is zero or a negative value and it is determined that it is more likely than not the goodwill is impaired, further analysis is required. The estimated fair values of the reporting units are derived based on valuation techniques we believe market participants would use for each of the reporting units. During 2017, the Company decided that it would change its annual impairment test date from July 31st to October 1st. The Company performed impairment testing on both July 31, 2017 and October 1, 2017 with no impairment charges resulting from the annual impairment tests. The Company believes that changing its annual impairment test date to the beginning of the fourth fiscal quarter will allow it to have carrying amounts that are more readily available as of the last day of the prior fiscal quarter and give the Company a full quarter to assess if it has a potential impairment (qualitative assessment and/or Step 1) and complete the measurement (Step 2), if required. Identifiable intangible assets, which are amortized over their estimated useful lives, are tested for potential impairment whenever events or changes in circumstances suggest that the carrying value of an asset or asset group may not be fully recoverable. Loans and Advances to Financial Advisors and Other Employees, Net We offer transition pay, principally in the form of upfront loans, to financial advisors and certain key revenue producers as part of our company’s overall growth strategy. These loans are generally forgiven by a charge to compensation and benefits over a five- to ten-year period if the individual satisfies certain conditions, usually based on continued employment and certain performance standards. We monitor and compare individual financial advisor production to each loan issued to ensure future recoverability. If the individual leaves before the term of the loan expires or fails to meet certain performance standards, the individual is required to repay the balance. In determining the allowance for doubtful receivables from former employees, management considers the facts and circumstances surrounding each receivable, including the amount of the unforgiven balance, the reasons for the terminated employment relationship, and the former employees’ overall financial situation. Derivative Instruments and Hedging Activities We recognize all of our derivative instruments at fair value as either assets or liabilities in the consolidated statements of financial condition. These instruments are recorded in other assets or accounts payable and accrued expenses in the consolidated statements of financial condition and in the operating section of the consolidated statements of cash flows as increases or decreases of other assets and accounts payable and accrued expenses. Our company’s policy is not to offset fair value amounts recognized for derivative instruments and fair value amounts recognized for the right to reclaim cash collateral or the obligation to return cash collateral arising from derivative instruments recognized at fair value executed with the same counterparty under master netting arrangements. The accounting for changes in the fair value (i.e., gains and losses) of a derivative instrument depends on whether it has been designated and qualifies as part of a hedging relationship and, further, on the type of hedging relationship. For those derivative instruments that are designated and qualify as hedging instruments, we must also designate the hedging instrument or transaction, based upon the exposure being hedged. For derivative instruments that are designated and qualify as cash flow hedges (i.e., hedging the exposure to variability in expected future cash flows that is attributable to a particular risk), the effective portion of the gain or loss on the derivative instrument is reported as a component of accumulated other comprehensive loss, net of tax, and reclassified into earnings in the same period or periods during which the hedged transaction affects earnings. The remaining gain or loss on the derivative instrument in excess of the cumulative change in the present value of future cash flows of the hedged item, if any, is recognized in current earnings during the period of change. We do not use derivatives for trading or speculative purposes and, at December 31, 2017, all of our derivatives are designated as cash flow hedges. See Note 14 for additional details. Revenue Recognition Customer securities transactions are recorded on a settlement date basis, with related commission revenues and expenses recorded on a trade date basis. Commission revenues are recorded as the amount charged to the customer, which, in certain cases, may include varying discounts. Principal securities transactions are recorded on a trade date basis. We typically distribute our proprietary equity research products to our client base of institutional investors at no charge. These proprietary equity research products are accounted for as a cost of doing business. Investment banking revenues, which include underwriting fees, management fees, advisory fees, placement fees, and sales credits earned in connection with the distribution of the underwritten securities, are recorded when services for the transactions are completed under the terms of each engagement. Expenses associated with such transactions are deferred until the related revenue is recognized or the engagement is otherwise concluded. Investment banking revenues are presented net of related unreimbursed expenses. We have not recognized any incentive income that is subject to contingent repayments. Asset management and service fees are recorded when earned, based on the period-end assets in the accounts, and consist of customer account service fees, per account fees (such as IRA fees), and wrap fees, net of external manager costs on managed accounts. We earn fees from the investment partnerships that we manage or of which we are a general partner. Such management fees are generally based on the net assets or committed capital of the underlying partnerships. We have agreed, in certain cases, to waive management fees, in lieu of making a cash contribution, in satisfaction of our general partner investment commitments to the investment partnerships. In these cases, we generally recognize our management fee revenues at the time when we are allocated a special profit interest in realized gains from these partnerships. Operating Leases We lease office space and equipment under operating leases. We recognize rent expense related to these operating leases on a straight-line basis over the lease term. The lease term commences on the earlier of the date when we become legally obligated for the rent payments or the date on which we take possession of the property. For tenant improvement allowances and rent holidays, we record a deferred rent liability in accounts payable and accrued expenses in the consolidated statements of financial condition and amortize the deferred rent over the lease term as a reduction to occupancy and equipment rental expense in the consolidated statements of operations. Income Taxes On December 22, 2017, the Tax Cuts and Jobs Act of 2017 (“Tax Legislation”) was signed into law making significant changes to the Internal Revenue Code. Changes include, but are not limited to, a corporate tax rate decrease from 35% to 21% effective for tax years beginning after December 31, 2017, the transition of U.S international taxation from a worldwide tax system to a territorial system, and a one-time transition tax on the mandatory deemed repatriation of cumulative foreign earnings as of December 31, 2017. In December 2017, the SEC staff issued Staff Accounting Bulletin No. 118, Income Tax Accounting Implications of the Tax Cuts and Jobs Act (“SAB 118”), which allows us to record provisional amounts during a measurement period not to extend beyond one year of the enactment date. We compute income taxes using the asset and liability method, under which deferred income taxes are provided for the temporary differences between the financial statement carrying amounts and the tax basis of our company’s assets and liabilities. We establish a valuation allowance for deferred tax assets if it is more likely than not that these items will either expire before we are able to realize their benefits, or that future deductibility is uncertain. We recognize the tax benefit from an uncertain tax position only if it is more likely than not that the tax position will be sustained on examination by the taxing authorities, based on the technical merits of the position. The tax benefits recognized in the consolidated financial statements from such a position are measured based on the largest benefit that has a greater than 50% likelihood of being realized upon ultimate settlement. We recognize interest and penalties related to uncertain tax positions in provision for income taxes in the consolidated statements of operations. See Note 23 for further information regarding income taxes. Foreign Currency Translation We consolidate our foreign subsidiaries, which have designated their local currency as their functional currency. Assets and liabilities of these foreign subsidiaries are translated at year-end rates of exchange. Revenues and expenses are translated at an average rate for the period. In accordance with FASB Accounting Standards Codification Topic 830, “Foreign Currency Matters,” Recently Issued Accounting Guidance Comprehensive Income In February 2018, the FASB issued ASU 2018-02, “Income Statement - Reporting Comprehensive Income (Topic 220): Reclassification of Certain Tax E

Acquisitions

Acquisitions	12 Months Ended
	Dec. 31, 2017
Business Combinations [Abstract]
Acquisitions	NOTE 3 – Acquisitions City Securities Corporation On January 3, 2017, the Company completed the acquisition of City Financial Corporation and its wholly owned subsidiary, City Securities Corporation, (“City Securities”), an independent investment bank focused primarily on offering wealth management and public finance services across the Midwest. The acquisition was funded with cash from operations and our common stock. The acquisition was accounted for under the acquisition method of accounting in accordance with ASC 805 (“ASC Topic 805”), “Business Combinations.” Accordingly, goodwill was measured as the excess of the acquisition-date fair value of the consideration transferred over the amount of acquisition-date identifiable assets acquired net of assumed liabilities. We recorded $7.1 million of goodwill in the consolidated statement of financial condition, which has been allocated to our company’s Global Wealth Management and Institutional Group segments. Identifiable intangible assets purchased by our company consisted of customer relationships with an acquisition-date fair value of $4.1 million. The goodwill represents the value expected from the synergies created through the operational enhancement benefits that will result from the integration of the City Securities’ business and of the hired financial advisors and the conversion of the customer accounts to our platform. Goodwill is not expected to be deductible for federal income tax purposes. We recognized a liability for estimated earn-out payments. These payments will be based on the performance of City Securities over a two-year period. The liability for earn-out payments was $0.5 million at December 31, 2017. The contingent consideration accrual is included in accounts payable and accrued expenses in the consolidated statements of financial condition. Pro forma information is not presented, because the acquisition is not considered to be material, as defined by the SEC. The results of operations of City Securities have been included in our results prospectively from the date of acquisition. ISM Capital LLP On May 3, 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 and our common stock, issued out of treasury. The acquisition was accounted for under the acquisition method of accounting in accordance with ASC 805 (“ASC Topic 805”), “Business Combinations.” Accordingly, goodwill was measured as the excess of the acquisition-date fair value of the consideration transferred over the amount of acquisition-date identifiable assets acquired net of assumed liabilities. We recorded $6.3 million of goodwill in the consolidated statement of financial condition, which has been allocated to our company’s Institutional Group segment. Identifiable intangible assets purchased by our company consisted of customer relationships, non-compete, and customer backlog with aggregate acquisition-date fair values of $2.3 million. The goodwill represents the value expected from the synergies created through the operational enhancement benefits that will result from the integration of ISM’s business and the addition of an end-to-end platform for convertible securities and other equity-linked debt instruments to our debt capital markets capabilities in Europe. Goodwill is not expected to be deductible for federal income tax purposes. We recognized a liability for estimated earn-out payments. These payments will be based on ISM’s performance over a three-year period. The liability for earn-out payments was $1.9 million and $3.7 million at December 31, 2017 and 2016, respectively. The contingent consideration accrual is included in accounts payable and accrued expenses in the consolidated statements of financial condition. Eaton Partners On January 4, 2016, we completed the acquisition of Eaton Partners, LLC (“Eaton Partners”), a global fund placement and advisory firm. The acquisition was funded with cash from operations and our common stock, issued out of treasury. The acquisition was accounted for under the acquisition method of accounting in accordance with Topic 805. Accordingly, goodwill was measured as the excess of the acquisition-date fair value of the consideration transferred over the amount of acquisition-date identifiable assets acquired net of assumed liabilities. We recorded $72.0 million of goodwill in the consolidated statement of financial condition, which has been allocated to our company’s Institutional Group segment. Identifiable intangible assets purchased by our company consisted of customer relationships, trade name, non-compete, and customer backlog with aggregate acquisition-date fair values of $32.3 million. The goodwill represents the value expected from the synergies created through the operational enhancement benefits that will result from the integration of Eaton’s business and from the relationships Eaton has established with private equity firms, hedge funds, high net worth family offices, and institutional investors. Goodwill is expected to be deductible for federal income tax purposes. We recognized a liability for estimated earn-out payments. These payments will be based on Eaton Partner’s performance over a four-year period. The liability for earn-out payments was $31.2 million and $27.3 million at December 31, 2017 and 2016, respectively. The contingent consideration accrual is included in accounts payable and accrued expenses in the consolidated statements of financial condition. Barclays Wealth and Investment Management, Americas On December 4, 2015, we completed the purchase of the Barclays Wealth and Investment Management, Americas (“Barclays”), franchise in the U.S. The Company paid purchase consideration that was funded with cash from operations. As part of that transaction, Stifel Bank, a wholly owned subsidiary of the Company, acquired approximately $600.0 million of bank loans, at fair value, from Barclays. The fair values for those loans were estimated using discounted cash flow analyses using interest rates currently being offered for loans with similar terms. The acquisition was accounted for under the acquisition method of accounting in accordance with Topic 805. Accordingly, goodwill was measured as the excess of the acquisition-date fair value of the consideration transferred over the amount of acquisition-date identifiable assets acquired net of assumed liabilities. We recorded $24.8 million of goodwill in the consolidated statement of financial condition, which has been allocated to our company’s Global Wealth Management segment. Identifiable intangible assets purchased by our company consisted of customer relationships, with acquisition-date fair value of $7.3 million. The goodwill represents the value expected from the synergies created through the operational enhancement benefits that will result from the integration of the hired financial advisors and the conversion of the customer accounts to the Stifel platform. Goodwill is expected to be deductible for federal income tax purposes. In addition, deferred consideration is payable based on certain revenue generated by Stifel in accordance with the distribution agreement. The deferred consideration of $15.2 million has been recognized as a liability and is included in accounts payable and accrued expenses in the consolidated statements of financial condition at December 31, 2017. During 2016, the Company’s Board of Directors removed the continuing service requirements associated with restricted stock units that were granted to certain employees of Barclays in December 2015. As a result, the awards were expensed at date of modification resulting in a charge of $58.6 million during 2016. The fair value of the awards is based upon the closing price of our company’s common stock on the date of the grant of the awards. These charges are included in compensation and benefits in the consolidated statements of operations for the year ended December 31, 2016. Sterne Agee Group, Inc. On June 5, 2015, we completed the purchase of all of the outstanding shares of common stock of Sterne Agee Group, Inc. (“Sterne Agee”), a financial services firm that offers comprehensive wealth management and investment services to a diverse client base including corporations, municipalities, and individual investors. The purchase was completed pursuant to the merger agreement dated February 23, 2015. On July 1, 2016, the Company completed the sale of Sterne Agee’s legacy independent brokerage and clearing businesses pursuant to two separate stock purchase agreements dated June 24, 2016. The acquisition was accounted for under the acquisition method of accounting in accordance with Topic 805. Accordingly, goodwill was measured as the excess of the acquisition-date fair value of the consideration transferred over the amount of acquisition-date identifiable assets acquired net of assumed liabilities. We recorded $60.8 million of goodwill and intangible assets in the consolidated statement of financial condition, which has been allocated to our company’s Global Wealth Management and Institutional Group segments. Identifiable intangible assets purchased by our company consisted of customer relationships with acquisition-date fair value of $29.3 million. The goodwill represents the value expected from the synergies created through the operational enhancement benefits that will result from the integration of Sterne Agee’s business and the reputation and expertise of Sterne Agee in the financial services sector. On June 5, 2015, certain employees were granted restricted stock units of our company as retention. The fair value of the awards issued as retention was $23.8 million. The fair value of the awards is based upon the closing price of our company’s common stock on the date of grant. There are no continuing service requirements associated with these restricted stock units, and accordingly, they were expensed at date of grant. This charge is included in compensation and benefits in the consolidated statements of operations for the year ended December 31, 2015. In addition, we paid $33.8 million in the form of notes to associates for retention. These notes will be forgiven by a charge to compensation and benefits over a five- to ten-year period if the individual satisfies certain conditions, usually based on continued employment and certain performance standards. Prior to the closing date, Sterne Agee had established adequate reserves for various claims that were included in the opening balance sheet. During the third quarter of 2015, one legal matter was settled and paid, and the excess reserves associated with the Canyon Ridge matter were distributed to Sterne Agee Group, Inc. shareholders. Under the terms of the agreements governing the acquisition, we have withheld a portion of the purchase price of Sterne Agee Group, Inc. pending the resolution of currently existing or subsequently arising liabilities relating to the operation of the Sterne Agee Group Inc. business prior to the closing of the acquisition. Based upon currently available information and review with counsel, we believe the amounts which we are allowed to withhold will be adequate to fully indemnify us from any losses related to the pre-closing operations of Sterne Agee Group, Inc.

Receivables From And Payables T

Receivables From And Payables To Brokers, Dealers And Clearing Organizations	12 Months Ended
	Dec. 31, 2017
Due To And From Broker Dealers And Clearing Organizations [Abstract]
Receivables From And Payables To Brokers, Dealers And Clearing Organizations	NOTE 4 – Receivables From and Payables to Brokers, Dealers, and Clearing Organizations Amounts receivable from brokers, dealers, and clearing organizations at December 31, 2017 and 2016, included (in thousands) December 31, 2017 2016 Receivables from clearing organizations $ 270,285 $ 568,373 Deposits paid for securities borrowed 132,776 382,691 Securities failed to deliver 56,046 73,688 $ 459,107 $ 1,024,752 Amounts payable to brokers, dealers, and clearing organizations at December 31, 2017 and 2016, included (in thousands) December 31, 2017 2016 Deposits received from securities loaned $ 219,782 $ 478,814 Securities failed to receive 29,297 27,882 Payable to clearing organizations 27,223 16,411 $ 276,302 $ 523,107 Deposits paid for securities borrowed approximate the market value of the securities. Securities failed to deliver and receive represent the contract value of securities that have not been delivered or received on settlement date.

Fair Value Measurements

Fair Value Measurements	12 Months Ended
	Dec. 31, 2017
Fair Value Disclosures [Abstract]
Fair Value Measurements	NOTE 5 – Fair Value Measurements We measure certain financial assets and liabilities at fair value on a recurring basis, including financial instruments owned, available-for-sale securities, investments, financial instruments sold, but not yet purchased, and derivatives. We generally utilize third-party pricing services to value Level 1 and Level 2 available-for-sale investment securities, as well as certain derivatives designated as cash flow hedges. We review the methodologies and assumptions used by the third-party pricing services and evaluate the values provided, principally by comparison with other available market quotes for similar instruments and/or analysis based on internal models using available third-party market data. We may occasionally adjust certain values provided by the third-party pricing service when we believe, as the result of our review, that the adjusted price most appropriately reflects the fair value of the particular security. Following are descriptions of the valuation methodologies and key inputs used to measure financial assets and liabilities recorded at fair value. The descriptions include an indication of the level of the fair value hierarchy in which the assets or liabilities are classified. Financial Instruments Owned and Available-For-Sale Securities When available, the fair value of financial instruments is based on quoted prices in active markets and reported in Level 1. Level 1 financial instruments include highly liquid instruments with quoted prices, such as equity securities listed in active markets, U.S. government securities, and corporate fixed income securities. If quoted prices are not available for identical instruments, fair values are obtained from pricing services, broker quotes, or other model-based valuation techniques with observable inputs, such as the present value of estimated cash flows, and reported as Level 2. The nature of these financial instruments include instruments for which quoted prices are available but traded less frequently, instruments whose fair value has been derived using a model where inputs to the model are directly observable in the market, or can be derived principally from or corroborated by observable market data, and instruments that are fair valued using other financial instruments, the parameters of which can be directly observed. Level 2 financial instruments include U.S. government agency securities, mortgage-backed securities, corporate securities infrequently traded, including fixed income securities, sovereign debt, and equity securities, state and municipal securities, and asset-backed securities, which primarily includes collateralized loan obligations. We have identified Level 3 financial instruments to include certain equity and corporate fixed income securities with unobservable pricing inputs and certain non-agency mortgage-backed securities. Level 3 financial instruments have little to no pricing observability as of the report date. These financial instruments do not have active two-way markets and are measured using management’s best estimate of fair value, where the inputs into the determination of fair value require significant management judgment or estimation. Investments Investments carried at fair value primarily include corporate equity securities, auction-rate securities (“ARS”), and private company investments. Corporate equity securities that are valued based on quoted prices in active markets are reported in Level 1. No securities with unobservable pricing inputs are reported in Level 3. ARS are valued based upon our expectations of issuer redemptions and using internal discounted cash flow models that utilize unobservable inputs. ARS are reported as Level 3 assets. Direct investments in private companies may be valued using the market approach and were valued based on an assessment of each underlying investment, incorporating evaluation of additional significant third-party financing, changes in valuations of comparable peer companies, the business environment of the companies, market indices, assumptions relating to appropriate risk adjustments for nonperformance, and legal restrictions on disposition, among other factors. The fair value derived from the methods used are evaluated and weighted, as appropriate, considering the reasonableness of the range of values indicated. Under the market approach, fair value may be determined by reference to multiples of market-comparable companies or transactions, including earnings before interest, taxes, depreciation, and amortization (“EBITDA”) multiples. For securities utilizing the market comparable companies valuation technique, a significant increase (decrease) in the EBITDA multiple in isolation could result in a significantly higher (lower) fair value measurement. Investments in Funds That Are Measured at Net Asset Value Per Share Investments at fair value include investments in funds, including certain money market funds that are measured at net asset value (“NAV”). The Company uses NAV to measure the fair value of its fund investments when (i) the fund investment does not have a readily determinable fair value and (ii) the NAV of the investment fund is calculated in a manner consistent with the measurement principles of investment company accounting, including measurement of the underlying investments at fair value. The Company’s investments in funds measured at NAV include private company investments, partnership interests, mutual funds, private equity funds, and money market funds. Private equity funds primarily invest in a broad range of industries worldwide in a variety of situations, including leveraged buyouts, recapitalizations, growth investments, and distressed investments. The private equity funds are primarily closed-end funds in which the Company’s investments are generally not eligible for redemption. Distributions will be received from these funds as the underlying assets are liquidated or distributed. The general and limited partnership interests in investment partnerships were primarily valued based upon NAVs received from third-party fund managers. The various partnerships are investment companies, which record their underlying investments at fair value based on fair value policies established by management of the underlying fund. Fair value policies at the underlying fund generally require the funds to utilize pricing/valuation information, including independent appraisals, from third-party sources. However, in some instances, current valuation information for illiquid securities or securities in markets that are not active may not be available from any third-party source or fund management may conclude that the valuations that are available from third-party sources are not reliable. In these instances, fund management may perform model-based analytical valuations that may be used as an input to value these investments. The tables below present the fair value of our investments in, and unfunded commitments to, funds that are measured at NAV (in thousands): December 31, 2017 December 31, 2016 Fair value of investments Unfunded commitments Fair value of investments Unfunded commitments Money market funds $ 77,441 $ — $ 35,637 $ — Mutual funds 11,748 — 11,301 — Private equity funds 7,677 1,825 9,310 2,020 Partnership interests 5,124 1,330 15,798 1,822 Private company investments — — 18,763 8,526 Total $ 101,990 $ 3,155 $ 90,809 $ 12,368 Financial Instruments Sold, But Not Yet Purchased Financial instruments sold, but not purchased, recorded at fair value based on quoted prices in active markets and other observable market data include highly liquid instruments with quoted prices, such as U.S. government securities and equity securities listed in active markets, which are reported as Level 1. If quoted prices are not available, fair values are obtained from pricing services, broker quotes, or other model-based valuation techniques with observable inputs, such as the present value of estimated cash flows, and reported as Level 2. The nature of these financial instruments include instruments for which quoted prices are available but traded less frequently, instruments whose fair value has been derived using a model where inputs to the model are directly observable in the market, or can be derived principally from or corroborated by observable market data, and instruments that are fair valued using other financial instruments, the parameters of which can be directly observed. Level 2 financial instruments include U.S. government agency securities, mortgage-backed securities not actively traded, corporate securities, including fixed income securities, sovereign debt, and equity securities. Derivatives Derivatives are valued using quoted market prices for identical instruments when available or pricing models based on the net present value of estimated future cash flows. The valuation models used require market observable inputs, including contractual terms, market prices, yield curves, credit curves, and measures of volatility. We manage credit risk for our derivative positions on a counterparty-by-counterparty basis and calculate credit valuation adjustments, included in the fair value of these instruments, on the basis of our relationships at the counterparty portfolio/master netting agreement level. These credit valuation adjustments are determined by applying a credit spread for the counterparty to the total expected exposure of the derivative after considering collateral and other master netting arrangements. We have classified our interest rate swaps as Level 2. Assets and liabilities measured at fair value on a recurring basis as of December 31, 2017, are presented below (in thousands) December 31, 2017 Total Level 1 Level 2 Level 3 Financial instruments owned: U.S. government securities $ 13,466 $ 13,466 $ — $ — U.S. government agency securities 147,223 — 147,223 — Mortgage-backed securities: Agency 329,691 — 329,691 — Non-agency 75,154 — 74,796 358 Corporate securities: Fixed income securities 329,179 362 328,575 242 Equity securities 46,802 46,411 138 253 Sovereign debt 32,470 — 32,470 — State and municipal securities 169,699 — 169,699 — Total financial instruments owned 1,143,684 60,239 1,082,592 853 Available-for-sale securities: U.S. government agency securities 4,983 516 4,467 — State and municipal securities 70,559 — 70,559 — Mortgage-backed securities: Agency 305,530 — 305,530 — Commercial 72,488 — 72,488 — Non-agency 1,568 — 1,568 — Corporate fixed income securities 1,211,442 — 1,211,442 — Asset-backed securities 2,106,938 — 2,106,938 — Total available-for-sale securities 3,773,508 516 3,772,992 — Investments: Corporate equity securities 49,978 49,978 — — Auction rate securities: Equity securities 34,789 — — 34,789 Municipal securities 846 — — 846 Other 1,217 — 360 857 Investments measured at NAV 24,549 Total investments 111,379 49,978 360 36,492 Cash equivalents measured at NAV 77,441 Derivative contracts (1) 7,995 — 7,995 — $ 5,114,007 $ 110,733 $ 4,863,939 $ 37,345 (1) Included in other assets in the consolidated statements of financial condition. December 31, 2017 Total Level 1 Level 2 Level 3 Liabilities: Financial instruments sold, but not yet purchased: U.S. government securities $ 442,402 $ 442,402 $ — $ — U.S. government agency securities 10,348 — 10,348 — Mortgage-backed securities: Agency 86,612 — 86,612 — Corporate securities: Fixed income securities 180,755 — 180,755 — Equity securities 38,510 38,070 440 — Sovereign debt 20,236 — 20,236 — Total financial instruments sold, but not yet purchased $ 778,863 $ 480,472 $ 298,391 $ — Assets and liabilities measured at fair value on a recurring basis as of December 31, 2016, are presented below (in thousands) December 31, 2016 Total Level 1 Level 2 Level 3 Financial instruments owned: U.S. government securities $ 9,951 $ 9,951 $ — $ — U.S. government agency securities 89,833 — 89,833 — Mortgage-backed securities: Agency 305,774 — 305,774 — Non-agency 28,402 — 27,320 1,082 Corporate securities: Fixed income securities 269,561 1,944 267,344 273 Equity securities 32,044 31,444 — 600 Sovereign debt 30,385 — 30,385 — State and municipal securities 159,095 — 159,095 — Total financial instruments owned 925,045 43,339 879,751 1,955 Available-for-sale securities: U.S. government agency securities 4,197 300 3,897 — State and municipal securities 72,490 — 72,490 — Mortgage-backed securities: Agency 338,732 — 338,732 — Commercial 72,773 — 72,773 — Non-agency 1,892 — 1,892 — Corporate fixed income securities 823,511 — 823,511 — Asset-backed securities 1,867,718 — 1,867,718 — Total available-for-sale securities 3,181,313 300 3,181,013 — Investments: Corporate equity securities 27,247 23,414 — 3,833 Auction rate securities: Equity securities 48,689 — — 48,689 Municipal securities 832 — — 832 Other 1,623 — 383 1,240 Investments measured at NAV 55,172 Total investments 133,563 23,414 383 54,594 Cash equivalents measured at NAV 35,637 Derivative contracts (1) 10,390 — 10,390 — $ 4,285,948 $ 67,053 $ 4,071,537 $ 56,549 (1) Included in other assets in the consolidated statements of financial condition. December 31, 2016 Total Level 1 Level 2 Level 3 Liabilities: Financial instruments sold, but not yet purchased: U.S. government securities $ 362,536 $ 362,536 $ — $ — U.S. government agency securities 20,549 — 20,549 — Mortgage-backed securities: Agency 94,552 — 94,552 — Non-agency 1 — 1 — Corporate securities: Fixed income securities 175,301 980 174,321 — Equity securities 18,395 18,395 — — Sovereign debt 27,667 — 27,667 — State and municipal securities 31 — 31 — Total financial instruments sold, but not yet purchased 699,032 381,911 317,121 — Derivative contracts (2) 1,823 — 1,823 — $ 700,855 $ 381,911 $ 318,944 $ — (2) Included in accounts payable and accrued expenses in the consolidated statements of financial condition. The following tables summarize the changes in fair value associated with Level 3 financial instruments during the years ended December 31, 2017 and 2016 (in thousands) Year Ended December 31, 2017 Financial instruments owned Investments Mortgage- Backed Securities – Non-Agency Corporate Fixed Income Securities Equity Securities Corporate Equity Securities Auction Rate Securities – Equity Auction Rate Securities – Municipal Other Balance at December 31, 2016 $ 1,082 $ 273 $ 600 $ 3,833 $ 48,689 $ 832 $ 1,240 Unrealized gains/(losses): Included in changes in net assets (1) (260 ) — (88 ) (133 ) 785 14 — Realized gains/(losses) (1) 90 — (259 ) 13 — — (383 ) Purchases — — — — — — — Sales (324 ) — — (120 ) — — — Redemptions (230 ) (31 ) — — — — — Transfers: Into Level 3 — — — — — — — Out of Level 3 — — — (3,593 ) (14,685 ) — — Net change (724 ) (31 ) (347 ) (3,833 ) (13,900 ) 14 (383 ) Balance at December 31, 2017 $ 358 $ 242 $ 253 $ — $ 34,789 $ 846 $ 857 (1) Realized and unrealized gains/(losses) related to financial instruments owned and investments are reported in other income in the consolidated statements of operations. Year Ended December 31, 2016 Financial instruments owned Investments Mortgage- Backed Securities – Non-Agency Corporate Fixed Income Securities Equity Securities Corporate Equity Securities Auction Rate Securities – Equity Auction Rate Securities – Municipal Other Balance at December 31, 2015 $ 1,476 $ — $ 619 $ 2,942 $ 50,442 $ 1,315 $ 20 Unrealized gains/(losses): Included in changes in net assets (1) (18 ) — (279 ) (361 ) 547 67 — Realized gains (1) 54 — — 2,453 — — — Purchases — 292 253 3,593 50 — 3,782 Sales — — — — — — — Redemptions (430 ) (19 ) — (4,794 ) (2,350 ) (550 ) — Transfers: Into Level 3 — — 7 — — — 465 Out of Level 3 — — — — — — (3,027 ) Net change (394 ) 273 (19 ) 891 (1,753 ) (483 ) 1,220 Balance at December 31, 2016 $ 1,082 $ 273 $ 600 $ 3,833 $ 48,689 $ 832 $ 1,240 (1) Realized and unrealized gains/(losses) related to financial instruments owned and investments are reported in other income in the consolidated statements of operations. The results included in the table above are only a component of the overall investment strategies of our company. The table above does not present Level 1 or Level 2 valued assets or liabilities. The changes to our company’s Level 3 classified instruments during the year ended December 31, 2017 were principally a result of transfers out of Level 3 due to market activity that provided transparency into the valuation of these assets. The changes in unrealized gains/(losses) recorded in earnings for the year ended December 31, 2017, relating to Level 3 assets still held at December 31, 2017, were immaterial. The following table summarizes quantitative information related to the significant unobservable inputs utilized in our company’s Level 3 recurring fair value measurements as of December 31, 2017. Valuation technique Unobservable input Range Weighted average Investments: Auction rate securities: Equity securities Discounted cash flow Discount rate 0.8% to 9.8% 4.8% Workout period 1-3 years 2.2 years Municipal securities Discounted cash flow Discount rate 1.0% to 9.1% 3.4% Workout period 1-4 years 1.9 years The fair value of certain Level 3 assets was determined using various methodologies, as appropriate, including third-party pricing vendors and broker quotes. These inputs are evaluated for reasonableness through various procedures, including due diligence reviews of third-party pricing vendors, variance analyses, consideration of current market environment, and other analytical procedures. The fair value for our auction rate securities was determined using an income approach based on an internally developed discounted cash flow model. The discounted cash flow model utilizes two significant unobservable inputs: discount rate and workout period. The discount rate was calculated using credit spreads of the underlying collateral or similar securities. The workout period was based on an assessment of publicly available information on efforts to re-establish functioning markets for these securities and our company’s own redemption experience. Significant increases in any of these inputs in isolation would result in a significantly lower fair value. On an ongoing basis, management verifies the fair value by reviewing the appropriateness of the discounted cash flow model and its significant inputs. Transfers Within the Fair Value Hierarchy We assess our financial instruments on a quarterly basis to determine the appropriate classification within the fair value hierarchy. Transfers between fair value classifications occur when there are changes in pricing observability levels. Transfers of financial instruments among the levels are deemed to occur at the beginning of the reporting period. There were $1.1 million of transfers of financial assets from Level 2 to Level 1 during the year ended December 31, 2017, corporate fixed income securities for which market trades were observed that provided transparency into the valuation of these assets. There were $4.9 million of transfers of financial assets from Level 1 to Level 2 during the year ended December 31, 2017, primarily related to corporate fixed income securities for which there were low volumes of recent trade activity observed. There were no transfers of financial assets into Level 3 during the year ended December 31, 2017. There were $18.3 million of transfers of financial assets out of Level 3 during the year ended December 31, 2017, primarily related to ARS that were transferred to Level 2 upon receiving a tender offer and subsequently sold and corporate equity securities for which market trades were observed that provided transparency into the valuation of these assets. Fair Value of Financial Instruments The following reflects the fair value of financial instruments as of December 31, 2017 and 2016, whether or not recognized in the consolidated statements of financial condition at fair value (in thousands) December 31, 2017 December 31, 2016 Carrying Value Estimated Fair Value Carrying Value Estimated Fair Value Financial assets: Cash and cash equivalents $ 696,283 $ 696,283 $ 912,932 $ 912,932 Cash segregated for regulatory purposes 90,802 90,802 73,235 73,235 Securities purchased under agreements to resell 512,220 512,220 248,588 248,588 Financial instruments owned 1,143,684 1,143,684 925,045 925,045 Available-for-sale securities 3,773,508 3,773,508 3,181,313 3,181,313 Held-to-maturity securities 3,698,098 3,710,478 3,038,405 3,040,554 Loans held for sale 226,068 226,068 228,588 228,588 Bank loans 6,947,759 6,953,328 5,591,190 5,633,804 Investments 111,379 111,379 133,563 133,563 Derivative contracts (1) 7,995 7,995 10,390 10,390 Financial liabilities: Securities sold under agreements to repurchase $ 233,704 $ 233,704 $ 268,546 $ 268,546 Bank deposits 13,411,935 12,702,746 11,527,483 11,092,185 Financial instruments sold, but not yet purchased 778,863 778,863 699,032 699,032 Derivative contracts (2) — — 1,823 1,823 Borrowings 256,000 256,000 377,000 377,000 Federal Home Loan Bank advances 745,000 745,000 500,000 500,000 Senior notes 1,014,940 1,044,768 795,891 799,632 Debentures to Stifel Financial Capital Trusts 67,500 64,962 67,500 52,525 (1) (2) Included in accounts payable and accrued expenses in the consolidated statements of financial condition. The following table presents the estimated fair values of financial instruments not measured at fair value on a recurring basis for the periods indicated (in thousands) December 31, 2017 Total Level 1 Level 2 Level 3 Financial assets: Cash $ 618,842 $ 618,842 $ — $ — Cash segregated for regulatory purposes 90,802 90,802 — — Securities purchased under agreements to resell 512,220 428,740 83,480 — Held-to-maturity securities 3,710,478 — 3,517,781 192,697 Loans held for sale 226,068 — 226,068 — Bank loans 6,953,328 — 6,953,328 — Financial liabilities: Securities sold under agreements to repurchase $ 233,704 $ 92,278 $ 141,426 $ — Bank deposits 12,702,746 — 12,702,746 — Borrowings 256,000 256,000 — — Federal Home Loan Bank advances 745,000 745,000 — — Senior notes 1,044,768 1,044,768 — — Debentures to Stifel Financial Capital Trusts 64,962 — — 64,962 December 31, 2016 Total Level 1 Level 2 Level 3 Financial assets: Cash $ 877,295 $ 877,295 $ — $ — Cash segregated for regulatory purposes 73,235 73,235 — — Securities purchased under agreements to resell 248,588 227,983 20,605 — Held-to-maturity securities 3,040,554 — 2,830,869 209,685 Loans held for sale 228,588 — 228,588 — Bank loans 5,633,804 — 5,633,804 — Financial liabilities: Securities sold under agreements to repurchase $ 268,546 $ 149,881 $ 118,665 $ — Bank deposits 11,092,185 — 11,092,185 — Borrowings 377,000 377,000 — — Federal Home Loan Bank advances 500,000 500,000 — — Senior notes 799,632 799,632 — — Debentures to Stifel Financial Capital Trusts 52,525 — — 52,525 The following, as supplemented by the discussion above, describes the valuation techniques used in estimating the fair value of our financial instruments as of December 31, 2017 and 2016. Financial Assets Securities Purchased Under Agreements to Resell Securities purchased under agreements to resell are collateralized financing transactions that are recorded at their contractual amounts plus accrued interest. The carrying values at December 31, 2017 and 2016 approximate fair value due to their short-term nature. Held-to-Maturity Securities Securities held to maturity are recorded at amortized cost based on our company’s positive intent and ability to hold these securities to maturity. Securities held to maturity include agency, commercial, and non-agency mortgage-backed securities, asset-backed securities, consisting of collateralized loan obligation securities and ARS, and corporate fixed income securities. The estimated fair value, included in the above table, is determined using several factors; however, primary weight is given to discounted cash flow modeling techniques that incorporated an estimated discount rate based upon recent observable debt security issuances with similar characteristics. Loans Held for Sale Loans held for sale consist of fixed-rate and adjustable-rate residential real estate loans intended for sale. Loans held for sale are stated at lower of cost or fair value. Fair value is determined based on prevailing market prices for loans with similar characteristics or on sale contract prices. Bank Loans The fair values of mortgage loans and commercial loans were estimated using a discounted cash flow method, a form of the income approach. Discount rates were determined considering rates at which similar portfolios of loans would be made under current conditions and considering liquidity spreads applicable to each loan portfolio based on the secondary market. Financial Liabilities Securities Sold Under Agreements to Repurchase Securities sold under agreements to repurchase are collateralized financing transactions that are recorded at their contractual amounts plus accrued interest. The carrying values at December 31, 2017 and 2016 approximate fair value due to the short-term nature. Bank Deposits The fair value for demand deposits is equal to the amount payable on demand at the reporting date (that is, their carrying amounts). The carrying amounts of variable-rate money-market and savings accounts approximate their fair values at the reporting date as these are short-term in nature. The fair value of other interest-bearing deposits, including certificates of deposit, was calculated by discounting the future cash flows using discount rates based on the expected current market rates for similar products with similar remaining terms. Borrowings The carrying amount of borrowings approximates fair value due to the relative short-term nature of such borrowings. In addition, Stifel Bank’s Federal Home Loan Bank advances reflect terms that approximate current market rates for similar borrowings. Senior Notes The fair value of our senior notes is estimated based upon quoted market prices. Debentures to Stifel Financial Capital Trusts The fair value of our trust preferred securities is based on the discounted value of contractual cash flows. We have assumed a discount rate based on the coupon achieved in our 4.250% senior notes due 2024. These fair value disclosures represent our best estimates based on relevant market information and information about the financial instruments. Fair value estimates are based on judgments regarding future expected losses, current economic conditions, risk characteristics of the various instruments, and other factors. These estimates are subjective in nature and involve uncertainties and matters of significant judgment and, therefore, cannot be determined with precision. Changes in the above methodologies and assumptions could significantly affect the estimates.

Financial Instruments Owned And

Financial Instruments Owned And Financial Instruments Sold, But Not Yet Purchased	12 Months Ended
	Dec. 31, 2017
Trading Securities Balance Sheet Reported Amounts [Abstract]
Financial Instruments Owned And Financial Instruments Sold, But Not Yet Purchased	NOTE 6 – Financial Instruments Owned and Financial Instruments Sold, But Not Yet Purchased The components of financial instruments owned and financial instruments sold, but not yet purchased, at December 31, 2017 and 2016, are as follows (in thousands) December 31, 2017 2016 Financial instruments owned: U.S. government securities $ 13,466 $ 9,951 U.S. government agency securities 147,223 89,833 Mortgage-backed securities: Agency 329,691 305,774 Non-agency 75,154 28,402 Corporate securities: Fixed income securities 329,179 269,561 Equity securities 46,802 32,044 Sovereign debt 32,470 30,385 State and municipal securities 169,699 159,095 $ 1,143,684 $ 925,045 Financial instruments sold, but not yet purchased: U.S. government securities $ 442,402 $ 362,536 U.S. government agency securities 10,348 20,549 Mortgage-backed securities: Agency 86,612 94,552 Non-agency — 1 Corporate securities: Fixed income securities 180,755 175,301 Equity securities 38,510 18,395 Sovereign debt 20,236 27,667 State and municipal securities — 31 $ 778,863 $ 699,032 At December 31, 2017 and 2016, financial instruments owned in the amount of $810.3 million and $992.9 million, respectively, were pledged as collateral (on a settlement-date basis) for our repurchase agreements and short-term borrowings. Financial instruments owned on a settlement-date basis were $1.3 billion at December 31, 2016. Our financial instruments owned are presented on a trade-date basis in the consolidated statements of financial condition. Financial instruments sold, but not yet purchased, represent obligations of our company to deliver the specified security at the contracted price, thereby creating a liability to purchase the security in the market at prevailing prices in future periods. We are obligated to acquire the securities sold short at prevailing market prices in future periods, which may exceed the amount reflected in the consolidated statements of financial condition.

Available-For-Sale And Held-To-

Available-For-Sale And Held-To-Maturity Securities	12 Months Ended
	Dec. 31, 2017
Investments Debt And Equity Securities [Abstract]
Available-For-Sale And Held-To-Maturity Securities	NOTE 7 – Available-for-Sale and Held-to-Maturity Securities The following tables provide a summary of the amortized cost and fair values of the available-for-sale securities and held-to-maturity securities at December 31, 2017 and 2016 (in thousands) December 31, 2017 Amortized Cost Gross Unrealized Gains (1) Gross Unrealized Losses (1) Estimated Fair Value Available-for-sale securities U.S. government agency securities $ 5,022 $ — $ (39 ) $ 4,983 State and municipal securities 74,691 — (4,132 ) 70,559 Mortgage-backed securities: Agency 308,409 102 (2,981 ) 305,530 Commercial 75,548 28 (3,088 ) 72,488 Non-agency 1,568 — — 1,568 Corporate fixed income securities 1,213,262 3,832 (5,652 ) 1,211,442 Asset-backed securities 2,098,958 12,877 (4,897 ) 2,106,938 $ 3,777,458 $ 16,839 $ (20,789 ) $ 3,773,508 Held-to-maturity securities (2) Mortgage-backed securities: Agency $ 1,334,833 $ 13,621 $ (16,208 ) $ 1,332,246 Commercial 58,971 1,313 — 60,284 Asset-backed securities 2,264,283 15,526 (1,862 ) 2,277,947 Corporate fixed income securities 40,011 27 (37 ) 40,001 $ 3,698,098 $ 30,487 $ (18,107 ) $ 3,710,478 December 31, 2016 Amortized Cost Gross Unrealized Gains (1) Gross Unrealized Losses (1) Estimated Fair Value Available-for-sale securities U.S. government agency securities $ 4,213 $ 2 $ (18 ) $ 4,197 State and municipal securities 76,066 — (3,576 ) 72,490 Mortgage-backed securities: Agency 340,738 298 (2,304 ) 338,732 Commercial 77,417 59 (4,703 ) 72,773 Non-agency 2,032 — (140 ) 1,892 Corporate fixed income securities 830,695 1,418 (8,602 ) 823,511 Asset-backed securities 1,858,929 9,857 (1,068 ) 1,867,718 $ 3,190,090 $ 11,634 $ (20,411 ) $ 3,181,313 Held-to-maturity securities (2) Mortgage-backed securities: Agency $ 1,567,758 $ 14,537 $ (17,037 ) $ 1,565,258 Commercial 59,581 1,786 — 61,367 Non-agency 688 — (13 ) 675 Asset-backed securities 1,370,300 6,242 (3,396 ) 1,373,146 Corporate fixed income securities 40,078 30 — 40,108 $ 3,038,405 $ 22,595 $ (20,446 ) $ 3,040,554 (1) Unrealized gains/(losses) related to available-for-sale securities are reported in accumulated other comprehensive loss. (2) Held-to-maturity securities are carried in the consolidated statements of financial condition at amortized cost, and the changes in the value of these securities, other than impairment charges, are not reported on the consolidated financial statements. For the year ended December 31, 2017, we received proceeds of $87.3 million from the sale of available for sale securities, which resulted in realized gains of $0.4 million. For the year ended December 31, 2016, there were no sales of available-for-sale securities. For the year ended December 31, 2015, we received proceeds of $641.6 million, from the sale of available-for-sale securities, which resulted in net realized gains of $3.2 million. During the years ended December 31, 2017, 2016, and 2015, unrealized gains, net of deferred tax expense, of $4.7 million, $5.8 million, and $1.4 million, respectively, were recorded in accumulated other comprehensive loss in the consolidated statements of financial condition. The table below summarizes the amortized cost and fair values of debt securities by contractual maturity (in thousands) December 31, 2017 Available-for-sale securities Held-to-maturity securities Amortized Cost Estimated Fair Value Amortized Cost Estimated Fair Value Debt securities Within one year $ 184,101 $ 184,021 $ 40,011 $ 40,001 After one year through three years 229,680 229,627 — — After three years through five years 318,964 316,198 — — After five years through ten years 920,147 922,763 403,840 405,319 After ten years 1,739,041 1,741,313 1,860,443 1,872,628 Mortgage-backed securities After three years through five years — — 58,971 60,284 After five years through ten years 58,263 55,824 143,715 141,770 After ten years 327,262 323,762 1,191,118 1,190,476 $ 3,777,458 $ 3,773,508 $ 3,698,098 $ 3,710,478 The maturities of our available-for-sale (fair value) and held-to-maturity (amortized cost) securities at December 31, 2017, are as follows (in thousands) Within 1 Year 1-5 Years 5-10 Years After 10 Years Total Available-for-sale: (1) U.S. government agency securities $ 1,722 $ 3,261 $ — $ — $ 4,983 State and municipal securities 274 84 18,745 51,456 70,559 Mortgage-backed securities: Agency — — 338 305,192 305,530 Commercial — — 55,486 17,002 72,488 Non-agency — — — 1,568 1,568 Corporate fixed income securities 182,025 542,480 486,937 — 1,211,442 Asset-backed securities — — 417,081 1,689,857 2,106,938 $ 184,021 $ 545,825 $ 978,587 $ 2,065,075 $ 3,773,508 Held-to-maturity: Mortgage-backed securities: Agency $ — $ — $ 143,715 $ 1,191,118 $ 1,334,833 Commercial — 58,971 — — 58,971 Asset-backed securities — — 403,840 1,860,443 2,264,283 Corporate fixed income securities 40,011 — — — 40,011 $ 40,011 $ 58,971 $ 547,555 $ 3,051,561 $ 3,698,098 (1) Due to the immaterial amount of income recognized on tax-exempt securities, yields were not calculated on a tax-equivalent basis. At December 31, 2017 and 2016, securities of $2.2 billion and $2.0 billion, respectively, were pledged at the Federal Home Loan Bank as collateral for borrowings and letters of credit obtained to secure public deposits. At December 31, 2017 and 2016, securities of $2.0 billion and $1.7 billion, respectively, were pledged with the Federal Reserve discount window. The following table shows the gross unrealized losses and fair value of the Company’s investment securities with unrealized losses, aggregated by investment category and length of time the individual investment securities have been in continuous unrealized loss positions, at December 31, 2017 (in thousands) Less than 12 months 12 months or more Total Gross Unrealized Losses Estimated Fair Value Gross Unrealized Losses Estimated Fair Value Gross Unrealized Losses Estimated Fair Value Available-for-sale securities U.S. government securities $ (39 ) $ 4,983 — — $ (39 ) $ 4,983 State and municipal securities (59 ) 2,797 (4,073 ) 67,762 (4,132 ) 70,559 Mortgage-backed securities: Agency (1,024 ) 113,363 (1,957 ) 158,880 (2,981 ) 272,243 Commercial — — (3,088 ) 71,161 (3,088 ) 71,161 Corporate fixed income securities (2,513 ) 504,591 (3,139 ) 185,879 (5,652 ) 690,470 Asset-backed securities (4,897 ) 175,074 — — (4,897 ) 175,074 $ (8,532 ) $ 800,808 $ (12,257 ) $ 483,682 $ (20,789 ) $ 1,284,490 Held-to-maturity securities Mortgage-backed securities: Agency $ (743 ) $ 76,481 $ (15,465 ) $ 697,809 $ (16,208 ) $ 774,290 Asset-backed securities (29 ) 29,399 (1,833 ) 42,906 (1,862 ) 72,305 Corporate fixed income securities (37 ) 9,965 — — (37 ) 9,965 $ (809 ) $ 115,845 $ (17,298 ) $ 740,715 $ (18,107 ) $ 856,560 At December 31, 2017, the amortized cost of 186 securities classified as available for sale exceeded their fair value by $20.8 million, of which $12.3 million related to investment securities that had been in a loss position for 12 months or longer. The total fair value of these investments at December 31, 2017, was $1.3 billion, which was 34.0% of our available-for-sale portfolio. At December 31, 2017, the carrying value of 42 securities held to maturity exceeded their fair value by $18.1 million, of which $17.3 million related to securities held to maturity that have been in a loss position for 12 months or longer. As discussed in more detail below, we conduct periodic reviews of all securities with unrealized losses to assess whether the impairment is other-than-temporary. Other-Than-Temporary Impairment We evaluate all securities in an unrealized loss position quarterly to assess whether the impairment is other-than-temporary. Our OTTI assessment is a subjective process requiring the use of judgments and assumptions. There was no credit-related OTTI recognized during the years ended December 31, 2017, 2016, and 2015. We believe the gross unrealized losses of $38.9 million related to our investment portfolio, as of December 31, 2017, are attributable to changes in market interest rates. We, therefore, do not expect to incur any credit losses related to these securities. In addition, we have no intent to sell these securities with unrealized losses, and it is not more likely than not that we will be required to sell these securities prior to recovery of the amortized cost. Accordingly, we have concluded that the impairment on these securities is not other-than-temporary.

Bank Loans

Bank Loans	12 Months Ended
	Dec. 31, 2017
Receivables [Abstract]
Bank Loans	NOTE 8 – Bank Loans The following table presents the balance and associated percentage of each major loan category in our bank loan portfolio at December 31, 2017 and 2016 (in thousands, except percentages) December 31, 2017 December 31, 2016 Balance Percent Balance Percent Residential real estate $ 2,593,576 37.0 % $ 2,161,400 38.4 % Commercial and industrial 2,437,938 34.8 1,710,399 30.3 Securities-based loans 1,819,206 25.9 1,614,033 28.6 Commercial real estate 116,258 1.7 78,711 1.4 Consumer 24,508 0.3 45,391 0.8 Home equity lines of credit 15,039 0.2 15,008 0.3 Construction and land 7,896 0.1 12,623 0.2 Gross bank loans 7,014,421 100.0 % 5,637,565 100.0 % Unamortized loan premium/(discount), net 788 858 Loans in process (856 ) (49 ) Unamortized loan fees, net 872 (2,021 ) Allowance for loan losses (67,466 ) (45,163 ) Bank loans, net $ 6,947,759 $ 5,591,190 At December 31, 2017 and 2016, Stifel Bank had loans outstanding to its executive officers, directors, and their affiliates in the amount of $4.0 million and $3.7 million, respectively, and loans outstanding to other Stifel Financial Corp. executive officers, directors, and their affiliates in the amount of $8.4 million and $5.6 million, respectively. At December 31, 2017 and 2016, we had loans held for sale of $226.1 million and $228.6 million, respectively. For the years ended December 31, 2017, 2016, and 2015, we recognized gains of $ 12.3 At December 31, 2017 and 2016, residential and commercial real estate loans of $2.4 billion and $2.3 billion, respectively, were pledged at the Federal Home Loan Bank as collateral for borrowings. The following table details activity in the allowance for loan losses by portfolio segment for the years ended December 31, 2017 and 2016 (in thousands) Year Ended December 31, 2017 Beginning Balance Provision Charge- offs Recoveries Ending Balance Commercial and industrial $ 35,127 $ 19,666 $ (355 ) $ 36 $ 54,474 Securities-based loans 3,094 (1,006 ) — — 2,088 Residential real estate 2,660 5,770 — — 8,430 Commercial real estate 1,363 2,860 (2,703 ) — 1,520 Home equity lines of credit 371 (212 ) — 3 162 Construction and land 232 (132 ) — — 100 Consumer 129 (115 ) — 2 16 Qualitative 2,187 (1,511 ) — — 676 $ 45,163 $ 25,320 $ (3,058 ) $ 41 $ 67,466 Year Ended December 31, 2016 Beginning Balance Provision Charge- offs Recoveries Ending Balance Commercial and industrial $ 24,748 $ 10,646 $ (267 ) $ — $ 35,127 Securities-based loans 1,607 1,487 — — 3,094 Residential real estate 1,241 1,430 (13 ) 2 2,660 Commercial real estate 264 1,090 — 9 1,363 Home equity lines of credit 290 81 — — 371 Construction and land 78 154 — — 232 Consumer 105 38 (16 ) 2 129 Qualitative 1,454 733 — — 2,187 $ 29,787 $ 15,659 $ (296 ) $ 13 $ 45,163 The following table presents the unpaid principal balances of loans and amount of allowance allocated based upon impairment method by portfolio segment at December 31, 2017 (in thousands) Allowance for Loan Losses Recorded Investment in Loans Individually Evaluated for Impairment Collectively Evaluated for Impairment Total Individually Evaluated for Impairment Collectively Evaluated for Impairment Total Residential real estate $ 24 $ 8,406 $ 8,430 $ 171 $ 2,593,405 $ 2,593,576 Commercial and industrial 9,059 45,415 54,474 28,856 2,409,082 2,437,938 Securities-based loans — 2,088 2,088 — 1,819,206 1,819,206 Commercial real estate — 1,520 1,520 — 116,258 116,258 Consumer 2 14 16 2 24,506 24,508 Home equity lines of credit 20 142 162 184 14,855 15,039 Construction and land — 100 100 — 7,896 7,896 Qualitative — 676 676 — — — $ 9,105 $ 58,361 $ 67,466 $ 29,213 $ 6,985,208 $ 7,014,421 The following table presents the unpaid principal balances of loans and amount of allowance allocated based upon impairment method by portfolio segment at December 31, 2016 (in thousands) Allowance for Loan Losses Recorded Investment in Loans Individually Evaluated for Impairment Collectively Evaluated for Impairment Total Individually Evaluated for Impairment Collectively Evaluated for Impairment Total Residential real estate $ 24 $ 2,636 $ 2,660 $ 178 $ 2,161,222 $ 2,161,400 Commercial and industrial 2,392 32,735 35,127 16,815 1,693,584 1,710,399 Securities-based loans — 3,094 3,094 — 1,614,033 1,614,033 Commercial real estate 722 641 1,363 9,522 69,189 78,711 Consumer 6 123 129 6 45,385 45,391 Home equity lines of credit 231 140 371 413 14,595 15,008 Construction and land — 232 232 — 12,623 12,623 Qualitative — 2,187 2,187 — — — $ 3,375 $ 41,788 $ 45,163 $ 26,934 $ 5,610,631 $ 5,637,565 In determining the amount of our allowance, we rely on an analysis of our loan portfolio, our experience, and our evaluation of general economic conditions. If our assumptions prove to be incorrect, our current allowance may not be sufficient to cover future loan losses and we may experience significant increases to our provision. There are two components of the allowance for loan losses: the inherent allowance component and the specific allowance component. The inherent allowance component of the allowance for loan losses is used to estimate the probable losses inherent in the loan portfolio and includes non-homogeneous loans that have not been identified as impaired and portfolios of smaller balance homogeneous loans. Our company maintains methodologies by loan product for calculating an allowance for loan losses that estimates the inherent losses in the loan portfolio. Qualitative and environmental factors, such as economic and business conditions, nature and volume of the portfolio and lending terms, and volume and severity of past due loans may also be considered in the calculations. The allowance for loan losses is maintained at a level reasonable to ensure that it can adequately absorb the estimated probable losses inherent in the portfolio. The specific allowance component of the allowance for loan losses is used to estimate probable losses for non-homogeneous exposures, including loans modified in a Troubled Debt Restructuring (TDR), which have been specifically identified for impairment analysis by our company and determined to be impaired. At December 31, 2017, we had $29.2 million of impaired loans, net of discounts, which included $9.1 million in troubled debt restructurings. The specific allowance on impaired loans at December 31, 2017 was $9.1 million. At December 31, 2016, we had $26.9 million of impaired loans, net of discounts, which included $9.7 million in troubled debt restructurings. The specific allowance on impaired loans at December 31, 2016 was $3.4 million. The gross interest income related to impaired loans, which would have been recorded had these loans been current in accordance with their original terms, and the interest income recognized on these loans during the year ended December 31, 2017 and 2016, were insignificant to the consolidated financial statements. The tables below present loans that were individually evaluated for impairment by portfolio segment at December 31, 2017 and 2016, including the average recorded investment balance (in thousands) December 31, 2017 Unpaid Contractual Principal Balance Recorded Investment with No Allowance Recorded Investment with Allowance Total Recorded Investment Related Allowance Average Recorded Investment Commercial and industrial $ 28,856 $ 5,211 $ 23,645 $ 28,856 $ 9,059 $ 30,277 Consumer 677 — 2 2 2 5 Home equity lines of credit 184 — 184 184 20 300 Residential real estate 171 — 171 171 24 174 Total $ 29,888 $ 5,211 $ 24,002 $ 29,213 $ 9,105 $ 30,756 December 31, 2016 Unpaid Contractual Principal Balance Recorded Investment with No Allowance Recorded Investment with Allowance Total Recorded Investment Related Allowance Average Recorded Investment Commercial and industrial $ 16,815 $ — $ 16,815 $ 16,815 $ 2,392 $ 22,559 Commercial real estate 10,503 — 9,522 9,522 722 9,080 Consumer 833 — 6 6 6 9 Home equity lines of credit 413 — 413 413 231 413 Residential real estate 178 — 178 178 24 181 Total $ 28,742 $ — $ 26,934 $ 26,934 $ 3,375 $ 32,242 The following tables present the aging of the recorded investment in past due loans at December 31, 2017 and 2016, by portfolio segment (in thousands) December 31, 2017 30-89 Days Past Due 90 or More Days Past Due Total Past Due Current Balance Total Residential real estate $ 7,892 $ — $ 7,892 $ 2,585,684 2,593,576 Commercial and industrial 11,883 — 11,883 2,426,055 2,437,938 Securities-based loans — — — 1,819,206 1,819,206 Commercial real estate — — — 116,258 116,258 Consumer 2 — 2 24,506 24,508 Home equity lines of credit 184 — 184 14,855 15,039 Construction and land — — — 7,896 7,896 Total $ 19,961 $ — $ 19,961 $ 6,994,460 $ 7,014,421 December 31, 2017 * Non-accrual Restructured Total Commercial and industrial $ 19,904 $ 8,952 $ 28,856 Home equity lines of credit 184 — 184 Residential real estate — 171 171 Consumer 2 — 2 Total $ 20,090 $ 9,123 $ 29,213 * There were no loans past due 90 days and still accruing interest at December 31, 2017. December 31, 2016 30 – 89 Days Past Due 90 or More Days Past Due Total Past Due Current Balance Total Residential real estate $ 1,923 $ — $ 1,923 $ 2,159,477 2,161,400 Commercial and industrial — — — 1,710,399 1,710,399 Securities-based loans — — — 1,614,033 1,614,033 Commercial real estate 9,522 — 9,522 69,189 78,711 Consumer — 2 2 45,389 45,391 Home equity lines of credit 78 196 274 14,734 15,008 Construction and land — — — 12,623 12,623 Total $ 11,523 $ 198 $ 11,721 $ 5,625,844 $ 5,637,565 December 31, 2016 * Non-accrual Restructured Total Commercial and industrial $ 16,815 $ — $ 16,815 Commercial real estate — 9,522 9,522 Home equity lines of credit 413 — 413 Residential real estate — 178 178 Consumer 6 — 6 Total $ 17,234 $ 9,700 $ 26,934 * There were no loans past due 90 days and still accruing interest at December 31, 2016. Credit quality indicators As of December 31, 2017, bank loans were primarily extended to non-investment-grade borrowers. Substantially all of these loans align with the U.S. federal bank regulatory agencies’ definition of Pass. Loans meet the definition of Pass when they are performing and/or do not demonstrate adverse characteristics that are likely to result in a credit loss. A loan is determined to be impaired when principal or interest becomes 90 days past due or when collection becomes uncertain. At the time a loan is determined to be impaired, the accrual of interest and amortization of deferred loan origination fees is discontinued (non-accrual status), and any accrued and unpaid interest income is reversed. We closely monitor economic conditions and loan performance trends to manage and evaluate our exposure to credit risk. Trends in delinquency ratios are an indicator, among other considerations, of credit risk within our loan portfolios. The level of nonperforming assets represents another indicator of the potential for future credit losses. Accordingly, key metrics we track and use in evaluating the credit quality of our loan portfolio include delinquency and nonperforming asset rates, as well as charge-off rates and our internal risk ratings of the loan portfolio. In general, we are a secured lender. At December 31, 2017 and 2016, 97.2% and 97.9% of our loan portfolio was collateralized, respectively. Collateral is required in accordance with the normal credit evaluation process based upon the creditworthiness of the customer and the credit risk associated with the particular transaction. Our company uses the following definitions for risk ratings: Pass . A credit exposure rated pass has a continued expectation of timely repayment, all obligations of the borrower are current, and the obligor complies with material terms and conditions of the lending agreement. Special Mention . Extensions of credit that have potential weakness that deserve management’s close attention and, if left uncorrected, may, at some future date, result in the deterioration of the repayment prospects or collateral position. Substandard . Obligor has a well-defined weakness that jeopardizes the repayment of the debt and has a high probability of payment default with the distinct possibility that we will sustain some loss if noted deficiencies are not corrected. Doubtful . Inherent weakness in the exposure makes the collection or repayment in full, based on existing facts, conditions, and circumstances, highly improbable, and the amount of loss is uncertain. Doubtful loans are considered impaired. Substandard loans are regularly reviewed for impairment. When a loan is impaired, the impairment is measured based on the present value of expected future cash flows discounted at the loan’s effective interest rate, or as a practical expedient, the observable market price of the loan or the fair value of the collateral if the loan is collateral dependent. Portfolio segments: Commercial and industrial (“C&I”). C&I loans primarily include commercial and industrial lending used for general corporate purposes, working capital and liquidity, and “event-driven.” “Event-driven” loans support client merger, acquisition, or recapitalization activities. C&I lending is structured as revolving lines of credit, letter of credit facilities, term loans, and bridge loans. Risk factors considered in determining the allowance for corporate loans include the borrower’s financial strength, seniority of the loan, collateral type, leverage, volatility of collateral value, debt cushion, and covenants. Securities-based loans . Securities-based loans allow clients to borrow money against the value of qualifying securities for any suitable purpose other than purchasing, trading, or carrying securities or refinancing margin debt. The majority of consumer loans are structured as revolving lines of credit and letter of credit facilities and are primarily offered through Stifel’s Pledged Asset (SPA) program. The allowance methodology for securities-based lending considers the collateral type underlying the loan. Consumer. Consumer loans allow customers to purchase non-investment goods and services. Real Estate . Real estate loans include commercial real estate, residential real estate non-conforming loans, residential real estate conforming loans, and home equity lines of credit. The allowance methodology real estate loans considers several factors, including, but not limited to, loan-to-value ratio, FICO score, home price index, delinquency status, credit limits, and utilization rates. Construction and land . Short-term loans used to finance the development of a real estate project. Based on the most recent analysis performed, the risk category of our loan portfolio was as follows: (in thousands) December 31, 2017 Pass Special Mention Substandard Doubtful Total Residential real estate $ 2,593,096 $ 309 $ 171 $ — $ 2,593,576 Commercial and industrial 2,385,152 22,443 30,343 — 2,437,938 Securities-based loans 1,819,206 — — — 1,819,206 Commercial real estate 116,258 — — — 116,258 Consumer 24,506 — 2 — 24,508 Home equity lines of credit 14,855 — 184 — 15,039 Construction and land 7,896 — — — 7,896 Total $ 6,960,969 $ 22,752 $ 30,700 $ — $ 7,014,421 December 31, 2016 Pass Special Mention Substandard Doubtful Total Residential real estate $ 2,161,223 $ — $ 177 $ — 2,161,400 Commercial and industrial 1,652,211 27,905 30,283 — 1,710,399 Securities-based loans 1,614,033 — — — 1,614,033 Commercial real estate 69,189 — 9,522 — 78,711 Consumer 45,385 — 6 — 45,391 Home equity lines of credit 14,595 — 413 — 15,008 Construction and land 12,623 — — — 12,623 Total $ 5,569,259 $ 27,905 $ 40,401 $ — $ 5,637,565

Fixed Assets

Fixed Assets	12 Months Ended
	Dec. 31, 2017
Property Plant And Equipment [Abstract]
Fixed Assets	NOTE 9 – Fixed Assets The following is a summary of fixed assets as of December 31, 2017 and 2016 (in thousands) December 31, 2017 2016 Furniture and equipment $ 201,917 $ 254,705 Building and leasehold improvements 192,320 160,369 Property on operating leases — 21,064 394,237 436,138 Less accumulated depreciation and amortization (239,117 ) (263,310 ) $ 155,120 $ 172,828 For the years ended December 31, 2017, 2016, and 2015, depreciation and amortization totaled $32.5 million, $43.1 million, and $36.7 million, respectively.

Goodwill And Intangible Assets

Goodwill And Intangible Assets	12 Months Ended
	Dec. 31, 2017
Goodwill And Intangible Assets Disclosure [Abstract]
Goodwill And Intangible Assets	NOTE 10 – Goodwill and Intangible Assets The carrying amount of goodwill and intangible assets attributable to each of our reporting segments is presented in the following table (in thousands) December 31, 2016 Net Additions Write-off December 31, 2017 Goodwill Global Wealth Management $ 270,779 $ 5,698 $ — $ 276,477 Institutional Group 691,503 854 — 692,357 $ 962,282 $ 6,552 $ — $ 968,834 December 31, 2016 Net Additions Amortization December 31, 2017 Intangible assets Global Wealth Management $ 45,231 $ 3,800 $ (4,506 ) $ 44,525 Institutional Group 71,073 1,658 (7,629 ) 65,102 $ 116,304 $ 5,458 $ (12,135 ) $ 109,627 The adjustments to goodwill and intangible assets during the year ended December 31, 2017, are primarily attributable to the acquisitions of ISM, which closed on May 3, 2016, and City Securities, which closed on January 3, 2017. Goodwill for certain of our acquisitions is deductible for tax purposes. Amortizable intangible assets consist of acquired customer relationships, trade name, investment banking backlog, and non-compete agreements that are amortized over their contractual or determined useful lives. Intangible assets subject to amortization as of December 31, 2017 and 2016 were as follows (in thousands) December 31, 2017 December 31, 2016 Gross Carrying Value Accumulated Amortization Gross Carrying Value Accumulated Amortization Customer relationships $ 146,986 $ 55,809 $ 141,621 $ 46,209 Trade name 24,713 10,228 24,713 8,670 Investment banking backlog 2,598 1,202 1,345 379 Non-compete agreements 1,419 968 2,578 813 $ 175,716 $ 68,207 $ 170,257 $ 56,071 Amortization expense related to intangible assets was $12.1 million, $14.4 million, and $10.4 million for the years ended December 31, 2017, 2016, and 2015, respectively. The weighted-average remaining lives of the following intangible assets at December 31, 2017, are: customer relationships, 10.8 years; trade name, 10.6 years; and non-compete agreements, 9.6 years. We have an intangible asset that is not subject to amortization and is, therefore, not included in the table below. As of December 31, 2017, we expect amortization expense in future periods to be as follows (in thousands) Fiscal year 2018 $ 10,890 2019 10,341 2020 10,124 2021 9,622 2022 8,880 Thereafter 57,652 $ 107,509

Borrowings and Federal Home Loa

Borrowings and Federal Home Loan Bank Advances	12 Months Ended
	Dec. 31, 2017
Short Term Debt Other Disclosures [Abstract]
Borrowings and Federal Home Loan Bank Advances	NOTE 11 – Borrowings and Federal Home Loan Bank Advances Our short-term financing is generally obtained through short-term bank line financing on an uncommitted, secured basis, advances from the Federal Home Loan Bank, and securities lending arrangements. We borrow from various banks on a demand basis with company-owned and customer securities pledged as collateral. The value of customer-owned securities used as collateral is not reflected in the consolidated statements of financial condition. We also have an unsecured, committed bank line available. Our uncommitted secured lines of credit at December 31, 2017, totaled $1.0 billion with six banks and are dependent on having appropriate collateral, as determined by the bank agreements, to secure an advance under the line. The availability of our uncommitted lines is subject to approval by the individual banks each time an advance is requested and may be denied. Our peak daily borrowing on our uncommitted secured lines was $444.4 million during the year ended December 31, 2017. There are no compensating balance requirements under these arrangements. Any borrowings on secured lines of credit are day-to-day and are generally utilized to finance certain fixed income securities. At December 31, 2017, our uncommitted secured lines of credit of $256.0 million were collateralized by company-owned securities valued at $292.7 million. Our committed bank line financing at December 31, 2017, consisted of a $200.0 million revolving credit facility. The credit facility expires in March 2020. The applicable interest rate under the revolving credit facility is calculated as a per annum rate equal to the London Interbank Offered Rate (“LIBOR”) plus 2.00%, as defined in the revolving credit facility. At December 31, 2017, we had no advances on our revolving credit facility and were in compliance with all covenants. The Federal Home Loan advances of $745.0 million as of December 31, 2017, are floating-rate advances. The weighted average interest rates on these advances during the year ended December 31, 2017, was 1.07%. The advances are secured by Stifel Bank’s residential mortgage loan portfolio and investment portfolio. The interest rates reset on a daily basis. Stifel Bank has the option to prepay these advances without penalty on the interest reset date.

Senior Notes

Senior Notes	12 Months Ended
	Dec. 31, 2017
Debt Disclosure [Abstract]
Senior Notes	NOTE 12 – Senior Notes The following table summarizes our senior notes as of December 31, 2017 and 2016 (in thousands) December 31, 2017 2016 4.250% senior notes, due 2024 (1) $ 500,000 $ 500,000 3.50% senior notes, due 2020 (2) 300,000 300,000 5.20% senior notes, due 2047 (3) 225,000 — 1,025,000 800,000 Debt issuance costs, net (10,060 ) (4,109 ) $ 1,014,940 $ 795,891 ( 1) In July 2014, we sold in a registered underwritten public offering, $300.0 million in aggregate principal amount of 4.250% senior notes due July 2024. Interest on these senior notes is payable semi-annually in arrears. We may redeem the notes in whole or in part, at our option, at a redemption price equal to 100% of their principal amount, plus a “make-whole” premium and accrued and unpaid interest, if any, to the date of redemption. In July 2016, we issued an additional $200.0 million in aggregate principal amount of 4.25% senior notes due 2024. (2) In December 2015, we sold in a registered underwritten public offering, $300.0 million in aggregate principal amount of 3.50% senior notes due December 2020. Interest on these senior notes is payable semi-annually in arrears. We may redeem the notes in whole or in part, at our option, at a redemption price equal to 100% of their principal amount, plus a “make-whole” premium and accrued and unpaid interest, if any, to the date of redemption. (3) Our senior notes mature as follows, based upon contractual terms (in thousands) 2018 $ — 2019 — 2020 300,000 2021 — 2022 — Thereafter 725,000 $ 1,025,000

Bank Deposits

Bank Deposits	12 Months Ended
	Dec. 31, 2017
Deposits Liabilities Balance Sheet Reported Amounts [Abstract]
Bank Deposits	NOTE 13 – Bank Deposits Deposits consist of money market and savings accounts, certificates of deposit, and demand deposits. Deposits at December 31, 2017 and 2016 were as follows (in thousands) December 31, 2017 2016 Money market and savings accounts $ 13,219,675 $ 11,264,285 Demand deposits (interest-bearing) 184,829 253,545 Demand deposits (non-interest-bearing) 5,856 5,752 Certificates of deposit 1,575 3,901 $ 13,411,935 $ 11,527,483 The weighted-average interest rate on deposits was 0.10% and 0.09% at December 31, 2017 and 2016, respectively. At December 31, 2017 and 2016, the amount of deposits includes related party deposits, primarily brokerage customers’ deposits from Stifel of $13.4 billion and $11.5 billion, respectively, and interest-bearing and time deposits of executive officers, directors, and their affiliates of $0.2 million and $0.5 million, respectively.

Derivative Instruments And Hedg

Derivative Instruments And Hedging Activities	12 Months Ended
	Dec. 31, 2017
General Discussion Of Derivative Instruments And Hedging Activities [Abstract]
Derivative Instruments And Hedging Activities	NOTE 14 – Derivative Instruments and Hedging Activities We use interest rate swaps as part of our interest rate risk management strategy. Interest rate swaps generally involve the exchange of fixed and variable rate interest payments between two parties, based on a common notional principal amount and maturity date with no exchange of underlying principal amounts. Interest rate swaps designated as cash flow hedges involve the receipt of variable amounts from a counterparty in exchange for our company making fixed payments. Our policy is not to offset fair value amounts recognized for derivative instruments and fair value amounts recognized for the right to reclaim cash collateral or the obligation to return cash collateral arising from derivative instruments recognized at fair value executed with the same counterparty under master netting arrangements. The following table provides the notional values and fair values of our derivative instruments as of December 31, 2017 and 2016 (in thousands) December 31, 2017 Asset Derivatives Notional Value Balance Sheet Location Fair Value Derivatives designated as hedging instruments under Topic 815: Cash flow interest rate contracts $ 540,000 Other assets $ 7,995 December 31, 2016 Asset Derivatives Notional Value Balance Sheet Location Fair Value Derivatives designated as hedging instruments under Topic 815: Cash flow interest rate contracts $ 790,000 Other assets $ 10,390 December 31, 2016 Liability Derivatives Notional Value Balance Sheet Location Fair Value Cash flow interest rate contracts $ 121,442 Accounts payable and accrued expenses $ 1,823 Cash Flow Hedges We have entered into interest rate swap agreements that effectively modify our exposure to interest rate risk by converting floating rate debt to a fixed rate debt. The swaps have an average remaining life of 2.1 years. Any unrealized gains or losses related to cash flow hedging instruments are reclassified from accumulated other comprehensive loss into earnings in the same period the hedged forecasted transaction affects earnings and are recorded in interest expense in the consolidated statements of operations. The ineffective portion of the cash flow hedging instruments is recorded in other income or other operating expense in the consolidated statements of operations. Amounts reported in accumulated other comprehensive loss related to derivatives will be reclassified to interest expense as interest payments are made on our variable rate deposits. During the next twelve months, we estimate that $3.2 million will be reclassified as an increase to interest expense. The following table shows the effect of our company’s derivative instruments in the consolidated statements of operations for the years ended December 31, 2017, 2016, and 2015 (in thousands) Year Ended December 31, 2017 Gain/(Loss) Recognized in OCI (Effectiveness) Location of Loss Reclassified From OCI Into Income Loss Reclassified From OCI Into Income Location of Loss Recognized in OCI (Ineffectiveness) Loss Recognized Due to Ineffectiveness Cash flow interest rate contracts $ 1,085 Interest Expense $ 635 Interest Expense $ — Year Ended December 31, 2016 Gain/(Loss) Recognized in OCI (Effectiveness) Location of Loss Reclassified From OCI Into Income Loss Reclassified From OCI Into Income Location of Loss Recognized in OCI (Ineffectiveness) Loss Recognized Due to Ineffectiveness Cash flow interest rate contracts $ 6,383 Interest expense $ 5,444 Interest expense $ 30 Year Ended December 31, 2015 Gain/(Loss) Recognized in OCI (Effectiveness) Location of Loss Reclassified From OCI Into Income Loss Reclassified From OCI Into Income Location of Loss Recognized in OCI (Ineffectiveness) Loss Recognized Due to Ineffectiveness Cash flow interest rate contracts $ (2,137 ) Interest expense $ 3,824 Interest expense $ — We maintain a risk management strategy that incorporates the use of derivative instruments to minimize significant unplanned fluctuations in earnings caused by interest rate volatility. Our goal is to manage sensitivity to changes in rates by hedging the maturity characteristics of variable rate affiliated deposits, thereby limiting the impact on earnings. By using derivative instruments, we are exposed to credit and market risk on those derivative positions. We manage the market risk associated with interest rate contracts by establishing and monitoring limits as to the types and degree of risk that may be undertaken. Credit risk is equal to the extent of the fair value gain in a derivative if the counterparty fails to perform. When the fair value of a derivative contract is positive, this generally indicates that the counterparty owes our company and, therefore, creates a repayment risk for our company. When the fair value of a derivative contract is negative, we owe the counterparty and, therefore, have no repayment risk. See Note 5 in the notes to our consolidated financial statements for further discussion on how we determine the fair value of our financial instruments. We minimize the credit (or repayment) risk in derivative instruments by entering into transactions with high-quality counterparties that are reviewed periodically by senior management. Credit Risk-Related Contingency Features We have agreements with our derivative counterparties containing provisions where if we default on any of our indebtedness, including default where repayment of the indebtedness has not been accelerated by the lender, then we could also be declared in default on our derivative obligations. We have agreements with certain of our derivative counterparties that contain provisions where if our shareholders’ equity declines below a specified threshold or if we fail to maintain a specified minimum shareholders’ equity, then we could be declared in default on our derivative obligations. Certain of our agreements with our derivative counterparties contain provisions where if a specified event or condition occurs that materially changes our creditworthiness in an adverse manner, we may be required to fully collateralize our obligations under the derivative instrument. Regulatory Capital-Related Contingency Features Certain of our derivative instruments contain provisions that require us to maintain our capital adequacy requirements. If we were to lose our status as “adequately capitalized,” we would be in violation of those provisions, and the counterparties of the derivative instruments could request immediate payment or demand immediate and ongoing full overnight collateralization on derivative instruments in net liability positions. As of December 31, 2017, the fair value of derivatives in a liability position, which includes accrued interest but excludes any adjustment for nonperformance risk, related to these agreements was not material (termination value). We have minimum collateral posting thresholds with certain of our derivative counterparties and have posted cash collateral of $0.8 million against our obligations under these agreements. If we had breached any of these provisions at December 31, 2017, we would have been required to settle our obligations under the agreements at the termination value. Counterparty Risk In the event of counterparty default, our economic loss may be higher than the uncollateralized exposure of our derivatives if we were not able to replace the defaulted derivatives in a timely fashion. We monitor the risk that our uncollateralized exposure to each of our counterparties for interest rate swaps will increase under certain adverse market conditions by performing periodic market stress tests. These tests evaluate the potential additional uncollateralized exposure we would have to each of these derivative counterparties assuming changes in the level of market rates over a brief time period.

Debentures To Stifel Financial

Debentures To Stifel Financial Capital Trusts	12 Months Ended
	Dec. 31, 2017
Junior Subordinated Debenture Owed To Unconsolidated Subsidiary Trust [Abstract]
Debentures To Stifel Financial Capital Trusts	NOTE 15 – Debentures to Stifel Financial Capital Trusts The following table summarizes our debentures to Stifel Financial Capital Trusts as of December 31, 2017 and 2016 (in thousands) December 31, 2017 2016 Debenture to Stifel Financial Capital Trust II (1) $ 20,000 $ 20,000 Debenture to Stifel Financial Capital Trust III (2) 35,000 35,000 Debenture to Stifel Financial Capital Trust IV (3) 12,500 12,500 $ 67,500 $ 67,500 (1) On August 12, 2005, we completed a private placement of $35.0 million of 6.38% Cumulative Trust Preferred Securities. The trust preferred securities were offered by Stifel Financial Capital Trust II (the “Trust II”), a non-consolidated wholly owned subsidiary of our company. The trust preferred securities mature on September 30, 2035, but may be redeemed by our company, and in turn, the Trust II would call the debenture beginning September 30, 2010. The Trust II requires quarterly distributions of interest to the holders of the trust preferred securities. Distributions are payable at a floating interest rate equal to three-month LIBOR plus 1.70% per annum. During 2016, we extinguished $15.0 million of the Trust II debentures. (2) On March 30, 2007, we completed a private placement of $35.0 million of 6.79% Cumulative Trust Preferred Securities. The trust preferred securities were offered by Stifel Financial Capital Trust III (the “Trust III”), a non-consolidated wholly owned subsidiary of our company. The trust preferred securities mature on June 6, 2037, but may be redeemed by our company, and in turn, Trust III would call the debenture beginning June 6, 2012. Trust III requires quarterly distributions of interest to the holders of the trust preferred securities. Distributions are payable at a floating interest rate equal to three-month LIBOR plus 1.85% per annum. (3) On June 28, 2007, we completed a private placement of $35.0 million of 6.78% Cumulative Trust Preferred Securities. The trust preferred securities were offered by Stifel Financial Capital Trust IV (the “Trust IV”), a non-consolidated wholly owned subsidiary of our company. The trust preferred securities mature on September 6, 2037, but may be redeemed by our company, and in turn, Trust IV would call the debenture beginning September 6, 2012. Trust IV requires quarterly distributions of interest to the holders of the trust preferred securities. Distributions are payable at a floating interest rate equal to three-month LIBOR plus 1.85% per annum.

Disclosures About Offsetting As

Disclosures About Offsetting Assets And Liabilities	12 Months Ended
	Dec. 31, 2017
Offsetting [Abstract]
Disclosures About Offsetting Assets And Liabilities	NOTE 16 – Disclosures About Offsetting Assets and Liabilities The following table provides information about financial assets and derivative assets that are subject to offset as of December 31, 2017 and 2016 (in thousands) Gross amounts not offset in the Statement of Financial Condition Gross Amounts of Recognized Assets Gross Amounts Offset in the of Financial Condition Net Amounts Presented in the Statement of Financial Condition Amounts available for offset Available collateral Net Amount As of December 31, 2017: Securities borrowing (1) $ 132,776 $ — $ 132,776 $ (78,474 ) $ (37,248 ) $ 17,054 Reverse repurchase agreements (2) 512,220 — 512,220 (233,624 ) (266,008 ) 12,588 Cash flow interest rate contracts 7,995 — 7,995 — — 7,995 $ 652,991 $ — $ 652,991 $ (312,098 ) $ (303,256 ) $ 37,637 As of December 31, 2016: Securities borrowing (1) $ 382,691 $ — $ 382,691 $ (291,793 ) $ (68,776 ) $ 22,122 Reverse repurchase agreements (2) 248,588 — 248,588 (216,542 ) (32,046 ) — Cash flow interest rate contracts 10,390 — 10,390 — — 10,390 $ 641,669 $ — $ 641,669 $ (508,335 ) $ (100,822 ) $ 32,512 (1) Securities borrowing transactions are included in receivables from brokers, dealers, and clearing organizations on the consolidated statements of financial condition. See Note 4 in the notes to consolidated financial statements for additional information on receivables from brokers, dealers, and clearing organizations. (2) Collateral received includes securities received by our company from the counterparty. These securities are not included on the consolidated statements of financial condition unless there is an event of default. The fair value of securities pledged as collateral was $509.4 million and $248.5 million at December 31, 2017 and 2016, respectively. The following table provides information about financial liabilities and derivative liabilities that are subject to offset as of December 31, 2017 and 2016 (in thousands) Gross amounts not offset in the Statement of Financial Condition Gross Amounts of Recognized Liabilities Gross Amounts Offset in the Statement of Financial Condition Net Amounts Presented in the Statement of Financial Condition Amounts available for offset Collateral Pledged Net Amount As of December 31, 2017: Securities lending (3) $ (219,782 ) $ — $ (219,782 ) $ 78,474 $ 133,772 $ (7,536 ) Repurchase agreements (4) (233,704 ) — (233,704 ) 233,624 80 — $ (453,486 ) $ — $ (453,486 ) $ 312,098 $ 133,852 $ (7,536 ) As of December 31, 2016: Securities lending (3) $ (478,814 ) $ — $ (478,814 ) $ 291,793 $ 175,849 $ (11,172 ) Repurchase agreements (4) (268,546 ) — (268,546 ) 216,542 52,004 — Cash flow interest rate contracts (1,823 ) — (1,823 ) — 1,823 — $ (749,183 ) $ — $ (749,183 ) $ 508,335 $ 229,676 $ (11,172 ) (3) Securities lending transactions are included in payables to brokers, dealers, and clearing organizations on the consolidated statements of financial condition. See Note 4 in the notes to consolidated financial statements for additional information on payables to brokers, dealers, and clearing organizations. (4) Collateral pledged includes the fair value of securities pledged by our company to the counter party. These securities are included on the consolidated statements of financial condition unless we default. Collateral pledged by our company to the counter party includes U.S. government agency securities, U.S. government securities, and corporate fixed income securities with market values of $241.4 million and $299.3 million at December 31, 2017 and 2016, respectively.

Commitments, Guarantees, And Co

Commitments, Guarantees, And Contingencies	12 Months Ended
	Dec. 31, 2017
Commitments And Contingencies Disclosure [Abstract]
Commitments, Guarantees, And Contingencies	NOTE 17 – Commitments, Guarantees, and Contingencies Broker-Dealer Commitments and Guarantees In the normal course of business, we enter into underwriting commitments. Settlement of transactions relating to such underwriting commitments, which were open at December 31, 2017, had no material effect on the consolidated financial statements. We also provide guarantees to securities clearinghouses and exchanges under their standard membership agreement, which requires members to guarantee the performance of other members. Under the agreement, if another member becomes unable to satisfy its obligations to the clearinghouse, other members would be required to meet shortfalls. Our liability under these agreements is not quantifiable and may exceed the cash and securities we have posted as collateral. However, the potential requirement for us to make payments under these arrangements is considered remote. Accordingly, no liability has been recognized for these arrangements. Other Commitments In the ordinary course of business, Stifel Bank has commitments to extend credit in the form of commitments to originate loans, standby letters of credit, and lines of credit. See Note 22 in the notes to consolidated financial statements for further details. We have committed capital to certain entities, and these commitments generally have no specified call dates. We had $3.2 million of commitments outstanding at December 31, 2017. Concentration of Credit Risk We provide investment, capital-raising, and related services to a diverse group of domestic customers, including governments, corporations, and institutional and individual investors. Our exposure to credit risk associated with the non-performance of customers in fulfilling their contractual obligations pursuant to securities transactions can be directly impacted by volatile securities markets, credit markets, and regulatory changes. This exposure is measured on an individual customer basis and on a group basis for customers that share similar attributes. To reduce the potential for risk concentrations, counterparty credit limits have been implemented for certain products and are continually monitored in light of changing customer and market conditions. As of December 31, 2017 and 2016, we did not have significant concentrations of credit risk with any one customer or counterparty, or any group of customers or counterparties. Operating Leases Future minimum commitments under non-cancelable operating leases at December 31, 2017, are as follows (in thousands) 2018 $ 96,009 2019 90,763 2020 77,186 2021 60,279 2022 52,732 Thereafter 151,548 $ 528,517 Certain leases contain provisions for renewal options and escalation clauses based on increases in certain costs incurred by the lessor. We amortize office lease incentives and rent escalation on a straight-line basis over the life of the lease. Rent expense for the years ended December 31, 2017, 2016, and 2015, was $104.5 million, $108.7 million, and $93.6 million, net of sublease income.

Legal Proceedings

Legal Proceedings	12 Months Ended
	Dec. 31, 2017
Loss Contingency Information About Litigation Matters [Abstract]
Legal Proceedings	NOTE 18 – Legal Proceedings Our company and its subsidiaries are named in and subject to various proceedings and claims arising primarily from our securities business activities, including lawsuits, arbitration claims, class actions, and regulatory matters. Some of these claims seek substantial compensatory, punitive, or indeterminate damages. Our company and its subsidiaries are also involved in other reviews, investigations, and proceedings by governmental and self-regulatory organizations regarding our business, which may result in adverse judgments, settlements, fines, penalties, injunctions, and other relief. We are contesting allegations in these claims, and we believe that there are meritorious defenses in each of these lawsuits, arbitrations, and regulatory investigations. In view of the number and diversity of claims against our company, the number of jurisdictions in which litigation is pending, and the inherent difficulty of predicting the outcome of litigation and other claims, we cannot state with certainty what the eventual outcome of pending litigation or other claims will be. We have established reserves for potential losses that are probable and reasonably estimable that may result from pending and potential legal actions, investigations, and regulatory proceedings. In many cases, however, it is inherently difficult to determine whether any loss is probable or reasonably possible or to estimate the amount or range of any potential loss, particularly where proceedings may be in relatively early stages or where plaintiffs are seeking substantial or indeterminate damages. Matters frequently need to be more developed before a loss or range of loss can reasonably be estimated. In our opinion, based on currently available information, review with outside legal counsel, and consideration of amounts provided for in our consolidated financial statements with respect to these matters the ultimate resolution of these matters will not have a material adverse impact on our financial position and results of operations. However, resolution of one or more of these matters may have a material effect on the results of operations in any future period, depending upon the ultimate resolution of those matters and depending upon the level of income for such period. For matters where a reserve has not been established and for which we believe a loss is reasonably possible, as well as for matters where a reserve has been recorded but for which an exposure to loss in excess of the amount accrued is reasonably possible, based on currently available information, we believe that such losses will not have a material effect on our consolidated financial statements. Broyles, et al. v. Cantor Fitzgerald & Co. et al. Matter In December 2013, Stone & Youngberg, LLC (“Stone & Youngberg”) was named in an Amended Complaint filed in U.S. District Court for the Middle District of Louisiana alleging fraud on the part of Stone & Youngberg in connection with the 2007 formation of the Collybus CDO, which was manufactured by Cantor Fitzgerald & Co. (“Cantor”) and purchased by Commonwealth Advisors (“CA”) on behalf of several CA funds (the “fund plaintiffs”), as well as in connection with, among other things, Stone & Youngberg’s facilitation of subsequent trades of Collybus CDO securities by CA on behalf of the CA funds during 2007 and 2008. In the Amended Complaint, the fund plaintiffs allege that they lost over $200.0 million during the financial crisis through mismanagement of the CA funds. In addition to the claims asserted against Stone & Youngberg, the Amended Complaint seeks to hold our company and Stifel liable for Stone & Youngberg’s alleged wrongdoing under theories of successor and alter ego liability, arising out of our company’s purchase of the membership interests of Stone & Youngberg in 2011 and the subsequent operation of that business. In a related action, approximately one dozen individual investors (the “individual plaintiffs”) brought a direct action against the Company and other defendants, seeking recessionary damages of approximately $90 million. The court ruled that the individual plaintiffs had no standing to pursue these claims because the CA funds are separately pursuing claims. The individual plaintiffs appealed that decision to the Fifth Circuit. During December 2017, the fund plaintiffs, the individual plaintiffs, our company and our subsidiaries, including Stone & Youngberg, entered into a settlement agreement that resolved all outstanding litigation related to this matter.

Regulatory Capital Requirements

Regulatory Capital Requirements	12 Months Ended
	Dec. 31, 2017
Regulatory Capital Requirements [Abstract]
Regulatory Capital Requirements	NOTE 19 – Regulatory Capital Requirements We operate in a highly regulated environment and are subject to capital requirements, which may limit distributions to our company from its subsidiaries. Distributions from our broker-dealer subsidiaries are subject to net capital rules. A broker-dealer that fails to comply with the SEC’s Uniform Net Capital Rule (Rule 15c3-1) may be subject to disciplinary actions by the SEC and self-regulatory organizations, such as FINRA, including censures, fines, suspension, or expulsion. Stifel has chosen to calculate its net capital under the alternative method, which prescribes that their net capital shall not be less than the greater of $1.0 million or two percent of aggregate debit balances (primarily receivables from customers) computed in accordance with the SEC’s Customer Protection Rule (Rule 15c3-3). Our other broker-dealer subsidiaries calculate their net capital under the aggregate indebtedness method, whereby their aggregate indebtedness may not be greater than fifteen times their net capital (as defined). At December 31, 2017, Stifel had net capital of $273.0 million, which was 18.6% of aggregate debit items and $243.6 million in excess of its minimum required net capital. At December 31, 2017, all of our other broker-dealer subsidiaries’ net capital exceeded the minimum net capital required under the SEC rule. Our international subsidiaries are subject to the regulatory supervision and requirements of the Financial Conduct Authority (“FCA”) in the United Kingdom. At December 31, 2017, our international subsidiaries’ capital and reserves were in excess of the financial resources requirement under the rules of the FCA. Our company, as a bank holding company, and Stifel Bank are subject to various regulatory capital requirements administered by the Federal and state banking agencies. Failure to meet minimum capital requirements can initiate certain mandatory and possibly additional discretionary actions by regulators that, if undertaken, could have a direct material effect on our company’s and Stifel Bank’s financial results. Under capital adequacy guidelines and the regulatory framework for prompt corrective action, our company and Stifel Bank must meet specific capital guidelines that involve quantitative measures of our assets, liabilities, and certain off-balance sheet items as calculated under regulatory accounting practices. Our company’s and Stifel Bank’s capital amounts and classification are also subject to qualitative judgments by the regulators about components, risk weightings, and other factors. Under the Basel III rules, the quantity and quality of regulatory capital increases, a capital conservation buffer was established, selected changes were made to the calculation of risk-weighted assets, and a new ratio, common equity Tier 1 was introduced, all of which are applicable to both our company and Stifel Bank. Various aspects of Basel III will be subject to multi-year transition periods through December 31, 2018. Our company and Stifel Bank are required to maintain minimum amounts and ratios of Total and Tier 1 capital (as defined in the regulations) to risk-weighted assets (as defined), Tier 1 capital to average assets (as defined), and under rules defined in Basel III, Common equity Tier 1 capital to risk-weighted assets. Our company and Stifel Bank each calculate these ratios in order to assess compliance with both regulatory requirements and their internal capital policies. At current capital levels, our company and Stifel Bank are each categorized as “well capitalized” under the regulatory framework for prompt corrective action. To be categorized as “well capitalized,” our company and Stifel Bank must maintain total risk-based, Tier 1 risk-based, and Tier 1 leverage ratios as set forth in the tables below (in thousands, except ratios) Stifel Financial Corp. – Federal Reserve Capital Amounts December 31, 2017 Actual For Capital Adequacy Purposes To Be Well Capitalized Under Prompt Corrective Action Provisions Amount Ratio Amount Ratio Amount Ratio Common equity tier 1 capital $ 1,689,291 16.9 % $ 450,758 4.5 % $ 651,095 6.5 % Tier 1 capital 1,899,162 19.0 601,011 6.0 801,347 8.0 Total capital 1,966,634 19.6 801,347 8.0 1,001,684 10.0 Tier 1 leverage 1,899,162 9.5 795,679 4.0 994,599 5.0 Stifel Bank – Federal Reserve Capital Amounts December 31, 2017 Actual For Capital Adequacy Purposes To Be Well Capitalized Under Prompt Corrective Action Provisions Amount Ratio Amount Ratio Amount Ratio Common equity tier 1 capital $ 1,056,211 14.3 % $ 331,447 4.5 % $ 478,757 6.5 % Tier 1 capital 1,056,211 14.3 441,930 6.0 589,240 8.0 Total capital 1,124,452 15.3 589,240 8.0 736,550 10.0 Tier 1 leverage 1,056,211 7.1 595,872 4.0 744,840 5.0

Interest Income And Interest Ex

Interest Income And Interest Expense	12 Months Ended
	Dec. 31, 2017
Banking And Thrift Interest [Abstract]
Interest Income And Interest Expense	NOTE 20 – Interest Income and Interest Expense The components of interest income and interest expense are as follows (in thousands) Year Ended December 31, 2017 2016 2015 Interest income: Bank loans, net of unearned income $ 206,084 $ 131,808 $ 79,816 Investment securities 189,472 108,992 53,787 Margin balances 37,218 32,147 22,421 Inventory 17,563 18,965 17,757 Other 4,044 2,420 5,320 $ 454,381 $ 294,332 $ 179,101 Interest expense: Senior notes $ 35,338 $ 36,217 $ 25,695 Bank deposits 12,661 7,331 7,262 Federal Home Loan Bank advances 8,305 6,777 551 Other 13,726 16,549 11,891 $ 70,030 $ 66,874 $ 45,399

Employee Incentive, Deferred Co

Employee Incentive, Deferred Compensation, And Retirement Plans	12 Months Ended
	Dec. 31, 2017
Share Based Compensation Allocation And Classification In Financial Statements [Abstract]
Employee Incentive, Deferred Compensation, And Retirement Plans	NOTE 21 – Employee Incentive, Deferred Compensation, and Retirement Plans We maintain several incentive stock award plans that provide for the granting of stock options, stock appreciation rights, restricted stock, performance award, stock units, and debentures to our employees. We are permitted to issue new shares under all stock award plans approved by shareholders or to reissue our treasury shares. Awards under our company’s incentive stock award plans are granted at market value at the date of grant. The awards generally vest ratably over a one- to ten-year vesting period. All stock-based compensation plans are administered by the Compensation Committee of the Board of Directors (“Compensation Committee”), which has the authority to interpret the plans, determine to whom awards may be granted under the plans, and determine the terms of each award. According to these plans, we are authorized to grant an additional 6.7 million shares at December 31, 2017. Stock-based compensation expense included in compensation and benefits expense in the consolidated statements of operations for our company’s incentive stock award plans was $246.7 million, $190.1 million, and $142.1 million for the years ended December 31, 2017, 2016, and 2015, respectively. As a result of the adoption of a new accounting standard on January 1, 2017, we recognized an excess tax benefit from stock-based compensation of $64.7 million for the year ended December 31, 2017. We adopted the new guidance prospectively. The tax provision related to stock-based compensation recognized in shareholders’ equity was $4.9 million for the year ended December 31, 2016, and a benefit of $14.7 million for the year ended December 31, 2015, respectively. In response to the Tax Legislation that was enacted in December 2017, the Company offered certain employees the opportunity to participate in the conversion of certain restricted stock units into restricted stock pursuant to a Modification Award Agreement. Under the terms of the Modification Award Agreement, vesting of certain restricted stock will no longer be contingent upon continued employment but rather will vest so long as the employee is not engaged in certain competitive or soliciting activities as provided in the Wealth Accumulation Plan (the “Plan”). The conversion through acceptance of the Modification Agreement by the participating employees resulted in a charge of $55.9 million, which is included in compensation and benefits in the consolidated statement of operations for the year ended December 31, 2017. The fair value of these awards was based upon the closing price of our company’s common stock on the date of the grant of the awards. In December 2017, the Company accelerated the vesting of certain outstanding debenture awards, resulting in a charge of $51.4 million, which is included in compensation and benefits in the consolidated statement of operations for the year ended December 31, 2017. During 2016, the Company’s Board of Directors removed the continuing service requirements associated with restricted stock units that were granted to certain employees of Barclays in December 2015. As a result of the modification, the awards were expensed at date of modification, resulting in a charge of $58.6 million during 2016. The fair value of the awards is based upon the closing price of our company’s common stock on the date of the grant of the awards. These charges are included in compensation and benefits in the consolidated statements of operations for the year ended December 31, 2016. On June 5, 2015, certain employees were granted restricted stock units of our company as retention. The fair value of the awards issued as retention was $23.8 million. The fair value of the awards is based upon the closing price of our company’s common stock on the date of grant. There are no continuing service requirements associated with these restricted stock units, and accordingly, they were expensed at date of grant. This charge is included in compensation and benefits in the consolidated statements of operations for the year ended December 31, 2015. Stock Options We have substantially eliminated the use of stock options as a form of compensation. During the year ended December 31, 2017, no options were granted. At December 31, 2017, we had 11,934 options outstanding with a weighted average exercise price of $29.33. At December 31, 2017, all outstanding options were exercisable. The total intrinsic value of options exercised during the years ended December 31, 2017, 2016 and 2015 were not material. Cash proceeds from the exercise of stock options were not material for the years ended December 31, 2017, 2016, and 2015. Restricted Stock Units and Restricted Stock Awards A restricted stock unit represents the right to receive a share of common stock from our company at a designated time in the future without cash payment by the employee and is issued in lieu of cash incentive, principally for deferred compensation and employee retention plans. The restricted stock units vest on an annual basis over the next one to ten years and are distributable, if vested, at future specified dates. Restricted stock awards are restricted as to sale or disposition. These restrictions lapse over the next one to five years. Our company grants Performance-based Restricted Stock Units (“PRSUs”) to its executive officers. Under the terms of the grants, the number of PRSUs that will vest and convert to shares will be based on our company's achievement of the pre-determined performance objectives during the performance period. The PRSUs will be measured over a four-year performance period and vested over a five-year period. The number of shares converted has the potential to range from 0% to 200% based on how our company performs during the performance period. Compensation expense is amortized on a straight-line basis over the service period based on the fair value of the award on the grant date. The Company’s pre-determined performance objectives must be met for the awards to vest. Employees forfeit unvested share units upon termination of employment with a corresponding reversal of compensation expense. At December 31, 2017, the total number of restricted stock units and restricted stock awards outstanding was 16.5 million, of which 12.3 million were unvested. At December 31, 2017, the total number of PRSU’s was 0.6 million, of which all were unvested. A summary of unvested restricted equity award activity, which includes restricted stock units and restricted stock awards, for the year ended December 31, 2017 is presented below (in thousands, except weighted-average fair value) Units/Awards Weighted-average grant date fair value Unvested December 31, 2016 16,276 $ 39.40 Granted 1,422 51.24 Vested (1,875 ) 33.59 Converted to restricted stock (3,111 ) 39.49 Cancelled (433 ) 33.93 Unvested December 31, 2017 12,279 $ 42.17 At December 31, 2017, there was approximately $251.3 million of unrecognized compensation cost for restricted stock units and restricted stock, which is expected to be recognized over a weighted-average period of 3.1 years. The fair value of restricted stock units and restricted stock that vested or converted during the year ended December 31, 2017, was $185.8 million. Deferred Compensation Plans The Wealth Accumulation Plan (the “Plan”) is provided to certain revenue producers, officers, and key administrative employees, whereby a certain percentage of their incentive compensation is deferred as defined by the Plan into company stock units and debentures. Participants may elect to defer a portion of their incentive compensation. Deferred awards generally vest over a one- to ten-year period and are distributable upon vesting or at future specified dates. Deferred compensation costs are amortized on a straight-line basis over the vesting period. Elective deferrals are 100% vested. Additionally, the Plan allows Stifel financial advisors who achieve certain levels of production the option to defer a certain percentage of their gross commissions. As stipulated by the Plan, the financial advisors will defer 5% of their gross commissions. The mandatory deferral will be split evenly between company restricted stock units and a company fixed-rate cash debenture. They have the option to defer an additional 1% of gross commissions into company stock units with a 25% matching contribution In addition, certain financial advisors, upon joining our company, may receive company stock units in lieu of transition cash payments. Deferred compensation related to these awards generally vests over a one- to eight-year period. Deferred compensation costs are amortized on a straight-line basis over the deferral period. Employee Profit Sharing Plan Eligible employees of our company who have met certain service requirements may participate in the Stifel Financial Corp. Profit Sharing 401(k) Plan (the “Plan”). Employees are permitted within limitations imposed by tax law to make pre-tax contributions to the Plan. We may match certain employee contributions or make additional contributions to the Plan at our discretion. Our contributions to the Profit Sharing Plan were $7.1 million, $6.5 million, and $7.7 million for the years ended December 31, 2017, 2016, and 2015, respectively.

Off-Balance Sheet Credit Risk

Off-Balance Sheet Credit Risk	12 Months Ended
	Dec. 31, 2017
Concentration Risks Types No Concentration Percentage [Abstract]
Off-Balance Sheet Credit Risk	NOTE 22 – Off-Balance Sheet Credit Risk In the normal course of business, we execute, settle, and finance customer and proprietary securities transactions. These activities expose our company to off-balance sheet risk in the event that customers or other parties fail to satisfy their obligations. In accordance with industry practice, securities transactions generally settle within two business days after trade date. Should a customer or broker fail to deliver cash or securities as agreed, we may be required to purchase or sell securities at unfavorable market prices. We borrow and lend securities to facilitate the settlement process and finance transactions, utilizing customer margin securities held as collateral. We monitor the adequacy of collateral levels on a daily basis. We periodically borrow from banks on a collateralized basis, utilizing firm and customer margin securities in compliance with SEC rules. Should the counterparty fail to return customer securities pledged, we are subject to the risk of acquiring the securities at prevailing market prices in order to satisfy our customer obligations. We control our exposure to credit risk by continually monitoring our counterparties’ positions, and where deemed necessary, we may require a deposit of additional collateral and/or a reduction or diversification of positions. Our company sells securities it does not currently own (short sales) and is obligated to subsequently purchase such securities at prevailing market prices. We are exposed to risk of loss if securities prices increase prior to closing the transactions. We control our exposure to price risk from short sales through daily review and setting position and trading limits. We manage our risks associated with the aforementioned transactions through position and credit limits and the continuous monitoring of collateral. Additional collateral is required from customers and other counterparties when appropriate. We have accepted collateral in connection with resale agreements, securities borrowed transactions, and customer margin loans. Under many agreements, we are permitted to sell or repledge these securities held as collateral and use these securities to enter into securities lending arrangements or to deliver to counterparties to cover short positions. At December 31, 2017 and 2016, the fair value of securities accepted as collateral where we are permitted to sell or repledge the securities was $2.4 billion and $2.5 billion, respectively, and the fair value of the collateral that had been sold or repledged was $233.7 million and $268.5 million, respectively. We enter into interest rate derivative contracts to manage exposures that arise from business activities that result in the receipt or payment of future known and uncertain cash amounts, the value of which are determined by interest rates. Our derivative financial instruments are principally used to manage differences in the amount, timing, and duration of our known or expected cash payments related to certain variable-rate affiliated deposits. Interest rate swaps designated as cash flow hedges involve the receipt of variable-rate amounts from a counterparty in exchange for us making fixed-rate payments. Our interest rate hedging strategies may not work in all market environments and, as a result, may not be effective in mitigating interest rate risk. Derivatives’ notional contract amounts are not reflected as assets or liabilities in the consolidated statements of financial condition. Rather, the market or fair value of the derivative transactions are reported in the consolidated statements of financial condition as other assets or accounts payable and accrued expenses, as applicable. For a complete discussion of our activities related to derivative instruments, see Note 14 in the notes to consolidated financial statements. In the ordinary course of business, Stifel Bank has commitments to originate loans, standby letters of credit, and lines of credit. Commitments to originate loans are agreements to lend to a customer as long as there is no violation of any condition established by the contract. These commitments generally have fixed expiration dates or other termination clauses and may require payment of a fee. Since a portion of the commitments may expire without being drawn upon, the total commitment amounts do not necessarily represent future cash commitments. Each customer’s creditworthiness is evaluated on a case-by-case basis. The amount of collateral obtained, if necessary, is based on the credit evaluation of the counterparty. Collateral held varies, but may include accounts receivable, inventory, property, plant and equipment, commercial real estate, and residential real estate. At December 31, 2017 and 2016, Stifel Bank had outstanding commitments to originate loans aggregating $160.2 million and $205.8 million, respectively. The commitments extended over varying periods of time, with all commitments at December 31, 2017, scheduled to be disbursed in the following three months. Through Stifel Bank, in the normal course of business, we originate residential mortgage loans and sell them to investors. We may be required to repurchase mortgage loans that have been sold to investors in the event there are breaches of certain representations and warranties contained within the sales agreements. We may be required to repurchase mortgage loans that were sold to investors in the event that there was inadequate underwriting or fraud, or in the event that the loans become delinquent shortly after they are originated. We also may be required to indemnify certain purchasers and others against losses they incur in the event of breaches of representations and warranties and in various other circumstances, and the amount of such losses could exceed the repurchase amount of the related loans. Consequently, we may be exposed to credit risk associated with sold loans. Standby letters of credit are irrevocable conditional commitments issued by Stifel Bank to guarantee the performance of a customer to a third party. Financial standby letters of credit are primarily issued to support public and private borrowing arrangements, including commercial paper, bond financing, and similar transactions. Performance standby letters of credit are issued to guarantee performance of certain customers under non-financial contractual obligations. The credit risk involved in issuing standby letters of credit is essentially the same as that involved in extending loans to customers. Should Stifel Bank be obligated to perform under the standby letters of credit, it may seek recourse from the customer for reimbursement of amounts paid. At December 31, 2017 and 2016, Stifel Bank had outstanding letters of credit totaling $82.5 million and $88.9 million, respectively. A majority of the standby letters of credit commitments at December 31, 2017, have expiration terms that are less than one year. Lines of credit are agreements to lend to a customer as long as there is no violation of any condition established in the contract. Lines of credit generally have fixed expiration dates. Stifel Bank uses the same credit policies in granting lines of credit as it does for on-balance sheet instruments. At December 31, 2017 and 2016, Stifel Bank had granted unused lines of credit to commercial and consumer borrowers aggregating $590.5 million and $492.5 million, respectively.

Income Taxes

Income Taxes	12 Months Ended
	Dec. 31, 2017
Components Of Income Tax Expense Benefit Continuing Operations [Abstract]
Income Taxes	NOTE 23 – Income Taxes The provision for income taxes consists of the following (in thousands) Year Ended December 31, 2017 2016 2015 Current taxes: Federal $ (29,396 ) $ 7,927 $ 43,962 State (334 ) 5,818 9,672 Foreign (1,734 ) 1,255 1,329 (31,464 ) 15,000 54,963 Deferred taxes: Federal 114,842 39,127 (9,396 ) State 1,728 6,261 3,056 Foreign 1,559 674 608 118,129 46,062 (5,732 ) Provision for income taxes $ 86,665 $ 61,062 $ 49,231 Reconciliation of the statutory federal income tax rate with our company’s effective income tax rate is as follows (in thousands) Year Ended December 31, 2017 2016 2015 Statutory rate $ 94,338 $ 49,904 $ 49,548 State income taxes, net of federal income tax 6,721 7,688 7,908 Investment in subsidiary — — (4,800 ) Change in uncertain tax position 1,544 41 (3,903 ) Non-deductible litigation expense — 7,700 — Foreign tax rate difference (412 ) (1,810 ) (106 ) Excess tax benefit from stock-based compensation (57,431 ) — — Revaluation of deferred tax assets 42,443 — — Other, net (538 ) (2,461 ) 584 $ 86,665 $ 61,062 $ 49,231 Tax effect of temporary differences and carryforwards that comprise significant portions of deferred tax assets and liabilities (in thousands) December 31, 2017 2016 Deferred tax assets: Deferred compensation $ 71,687 $ 181,575 Accrued expenses 33,957 35,443 Net operating loss carryforwards 31,986 40,266 Receivable reserves 22,679 22,870 Depreciation 4,012 12,550 Total deferred tax assets 164,321 292,704 Valuation allowance (4,285 ) (8,768 ) 160,036 283,936 Deferred tax liabilities: Goodwill and other intangibles (38,982 ) (49,481 ) Unrealized gain on investments (11,081 ) (1,459 ) Prepaid expenses (2,834 ) (4,557 ) Other (1,987 ) (2,986 ) (54,884 ) (58,483 ) Net deferred tax asset $ 105,152 $ 225,453 On December 22, 2017, the Tax Cuts and Jobs Act of 2017 (“Tax Legislation”) was signed into law making significant changes to the Internal Revenue Code. Changes include, but are not limited to, a corporate tax rate decrease from 35% to 21% effective for tax years beginning after December 31, 2017, the transition of U.S international taxation from a worldwide tax system to a territorial system, and a one-time transition tax on the mandatory deemed repatriation of cumulative foreign earnings as of December 31, 2017. In December 2017, the SEC staff issued Staff Accounting Bulletin No. 118, Income Tax Accounting Implications of the Tax Cuts and Jobs Act (“SAB 118”), which allows us to record provisional amounts during a measurement period not to extend beyond one year of the enactment date. The Company has calculated an estimate of the impact of the Tax Legislation in its year end income tax provision in accordance with its understanding of the Tax Legislation and guidance available as of the date of this filing and as a result has recorded $42.4 million as an additional income tax expense in the fourth quarter of 2017, the period in which the legislation was enacted. The provisional amount related to the re-measurement of certain deferred tax assets and liabilities is based on the rates at which they are expected to reverse in the future. In addition, the Tax Legislation includes a one-time mandatory repatriation transition tax on the net accumulated earnings and profits of a U.S. taxpayer’s foreign subsidiaries. We have performed an initial earnings and profits analysis and have determined that there was no income tax effect in the current period, which we consider to be a provisional analysis. In accordance with SAB 118, any subsequent adjustments to these amounts will be recorded to current tax expense in the quarter of 2018 when the analysis is complete. Our net deferred tax asset at December 31, 2017, includes net operating loss carryforwards of $334.3 million that expire between 2020 and 2037. Certain of our net operating loss carryforwards do not expire. A valuation allowance is recorded to the extent that it is more likely than not that any portion of the deferred tax asset will not be realized. The valuation allowance was decreased by $4.5 million due to 1) an inactive foreign entity was formally dissolved and 2) a change in the federal tax rate as a result of the enactment of the Tax Cuts and Jobs Act in the fourth quarter of 2017. We believe the realization of the remaining net deferred tax asset of $105.2 million is more likely than not based on the ability to carry back losses against prior year taxable income and expectations of future taxable income. The current tax payable, included in accounts payable and accrued expenses, is $4.2 million and $16.0 million as of December 31, 2017 and 2016, respectively. At December 31, 2017, the Company has a tax receivable of $54.3 million, included in other assets, which is primarily attributable to tax deductions that the Company will realize as a result of the actions taken to maximize tax savings in response to the Tax Legislation that was enacted in the fourth quarter of 2017 and prior year tax overpayments. We have recorded income tax expense at U.S. tax rates on all profits, except for undistributed profits of our foreign subsidiaries that are considered indefinitely reinvested. Determination of the amount of unrecognized deferred tax liability related to indefinitely reinvested profits is not feasible. If management’s intentions or U.S. tax laws change in the future, there may be a significant impact on the provision for income taxes to record a change in the tax liability in the period the change occurs. Uncertain Tax Positions As of December 31, 2017 and 2016, we had $3.2 million and $1.8 million, respectively, of gross unrecognized tax benefits, all of which, if recognized, would impact the effective tax rate. We recognize interest and penalties related to uncertain tax positions in provision for income taxes in the consolidated statements of operations. As of December 31, 2017 and 2016, we had accrued interest and penalties of $0.5 million and $0.7 million, respectively, before benefit of federal tax deduction, included in accounts payable and accrued expenses on our consolidated statements of financial condition. The amount of interest and penalties recognized on our consolidated statements of operations for the years ended December 31, 2017, 2016, and 2015, was not significant. The following table summarizes the activity related to our company’s unrecognized tax benefits from January 1, 2015 to December 31, 2017 (in thousands) Year Ended December 31, 2017 2016 2015 Beginning balance $ 1,800 $ 2,717 $ 5,510 Increase related to prior year tax positions 3,036 5 1,206 Decrease related to prior year tax positions (287 ) (31 ) (33 ) Increase related to current year tax positions — — — Decrease related to settlements with taxing authorities (171 ) (42 ) (4,815 ) Decrease related to lapsing of statute of limitations (1,198 ) — — Increase/(decrease) related to business acquisitions — (849 ) 849 Ending balance $ 3,180 $ 1,800 $ 2,717 We file income tax returns with the U.S. federal jurisdiction, various states, and certain foreign jurisdictions. We are not subject to U.S. federal examination for taxable years before 2012. We are not subject to certain state and local, or non-U.S. income tax examinations for taxable years before 2010. There is a reasonable possibility that the unrecognized tax benefits will change within the next 12 months as a result of the expiration of various statutes of limitations or for the resolution of U.S. federal and state examinations, but we do not expect this change to be material to the consolidated financial statements.

Segment Reporting

Segment Reporting	12 Months Ended
	Dec. 31, 2017
Segment Reporting [Abstract]
Segment Reporting	NOTE 24 – Segment Reporting We currently operate through the following three reporting segments: Global Wealth Management, Institutional Group, and various corporate activities combined in the Other segment. Our Global Wealth Management segment consists of two operating segments, the Private Client Group and Stifel Bank. The Private Client Group includes branch offices and independent contractor offices of our broker-dealer subsidiaries located throughout the United States. These branches provide securities brokerage services, including the sale of equities, mutual funds, fixed income products, and insurance, as well as offering banking products to their clients through Stifel Bank. Stifel Bank segment provides residential, consumer, and commercial lending, as well as FDIC-insured deposit accounts to customers of our private client group and to the general public. The Institutional Group segment includes institutional sales and trading. It provides securities brokerage, trading, and research services to institutions, with an emphasis on the sale of equity and fixed income products. This segment also includes the management of and participation in underwritings for both corporate and public finance (exclusive of sales credits generated through the private client group, which are included in the Global Wealth Management segment), merger and acquisition, and financial advisory services. The Other segment includes interest income from stock borrow activities, unallocated interest expense, interest income and gains and losses from investments held, compensation expense associated with the expensing of restricted stock awards with no continuing service requirements in conjunction with recent acquisitions and the actions taken by the Company in response to the Tax Regulation enacted in the fourth quarter of 2017, amortization of stock-based awards, and all unallocated overhead cost associated with the execution of orders; processing of securities transactions; custody of client securities; receipt, identification, and delivery of funds and securities; compliance with regulatory and legal requirements; internal financial accounting and controls; and general administration and acquisition charges. Information concerning operations in these segments of business for the years ended December 31, 2017, 2016, and 2015, is as follows (in thousands) Year Ended December 31, 2017 2016 2015 Net revenues: (1) Global Wealth Management $ 1,822,218 $ 1,563,410 $ 1,377,313 Institutional Group 1,110,768 1,014,164 975,594 Other (6,554 ) (2,078 ) (21,313 ) $ 2,926,432 $ 2,575,496 $ 2,331,594 Income/(loss) before income taxes: Global Wealth Management $ 626,906 $ 430,318 $ 382,126 Institutional Group 217,981 164,143 141,042 Other (575,351 ) (451,879 ) (381,601 ) $ 269,536 $ 142,582 $ 141,567 (1) No individual client accounted for more than 10 percent of total net revenues for the years ended December 31, 2017, 2016, and 2015. The following table presents our company’s total assets on a segment basis at December 31, 2017 and 2016 (in thousands) December 31, 2017 2016 Global Wealth Management $ 17,717,617 $ 16,065,503 Institutional Group 3,313,304 2,657,183 Other 353,032 406,670 $ 21,383,953 $ 19,129,356 We have operations in the United States, United Kingdom, Europe, and Asia. Our company’s foreign operations are conducted through its wholly owned subsidiary, SNEL. Substantially all long-lived assets are located in the United States. Revenues, classified by the major geographic areas in which they were earned for the years ended December 31, 2017, 2016, and 2015, were as follows (in thousands): Year Ended December 31, 2017 2016 2015 United States $ 2,783,175 $ 2,429,714 $ 2,195,538 United Kingdom 129,288 132,622 125,552 Other 13,969 13,160 10,504 $ 2,926,432 $ 2,575,496 $ 2,331,594

Earnings Per Share ("EPS")

Earnings Per Share ("EPS")	12 Months Ended
	Dec. 31, 2017
Earnings Per Share [Abstract]
Earnings Per Share	NOTE 25 – Earnings Per Share (“EPS”) Basic EPS is computed by dividing earnings available to common shareholders by the weighted-average number of common shares outstanding. Diluted EPS reflects the potential dilution that could occur if securities or other contracts to issue common stock were exercised or converted into common stock or resulted in the issuance of common stock that then shared in the earnings of the entity. Diluted earnings per share include dilutive stock options and stock units under the treasury stock method. The following table sets forth the computation of basic and diluted earnings per share for the years ended December 31, 2017, 2016, and 2015 (in thousands, except per share data) Year Ended December 31, 2017 2016 2015 Net income $ 182,871 $ 81,520 $ 92,336 Preferred dividends 9,375 3,906 — Net income available to common shareholders $ 173,496 $ 77,614 $ 92,336 Shares for basic and diluted calculation: Average shares used in basic computation 68,562 66,871 68,543 Dilutive effect of stock options and units (1) 12,473 10,692 10,011 Average shares used in diluted computation 81,035 77,563 78,554 Earnings per common share: Basic $ 2.53 $ 1.16 $ 1.35 Diluted $ 2.14 $ 1.00 $ 1.18 (1) Diluted earnings per share is computed on the basis of the weighted-average number of shares of common stock plus the effect of dilutive potential common shares outstanding during the period using the treasury stock method. Diluted earnings per share include stock options and units. For the years ended December 31, 2017, 2016, and 2015, the anti-dilutive effect from restricted stock units was immaterial.

Shareholders' Equity

Shareholders' Equity	12 Months Ended
	Dec. 31, 2017
Equity [Abstract]
Shareholders' Equity	NOTE 26 – Shareholders’ Equity Share Repurchase Program We have an ongoing authorization from the Board of Directors to repurchase our common stock in the open market or in negotiated transactions. At December 31, 2017, the maximum number of shares that may yet be purchased under this plan was 7.1 million. The repurchase program has no expiration date. These purchases may be made on the open market or in privately negotiated transactions, depending upon market conditions and other factors. Repurchased shares may be used to meet obligations under our employee benefit plans and for general corporate purposes. During the year ended December 31, 2017, we repurchased $ 13.0 113.5 Issuance of Common Stock from Treasury During the year ended December 31, 2017, we issued 2.4 million shares of common stock from treasury. Share issuances out of treasury during the year ended December 31, 2017, were primarily a result of the vesting and exercise transactions under our incentive stock award plans. During the year ended December 31, 2016, we issued 0.3 million shares of common stock from treasury, in aggregate, as part of the purchase consideration for our acquisitions of Eaton Partners, which closed on January 4, 2016, and ISM, which closed on May 3, 2016. Issuance of Common Stock On January 3, 2017, we issued 0.2 million shares related to the purchase of City Securities, Inc. See Note 3 in the notes to consolidated financial statements for additional information regarding the acquisition. On June 5, 2015, we issued 1.4 million shares related to the purchase of Sterne Agee Group, Inc. See Note 3 in the notes to consolidated financial statements for additional information regarding the acquisition. Issuance of Preferred Stock On July 11, 2016, our company issued $150.0 million of perpetual 6.25% Non-Cumulative Perpetual Preferred Stock, Series A, $1.00 par value, with a liquidation preference of $25,000 per share (equivalent to $25 liquidation preference per depositary share). When, as, and if declared by the board of directors of the company, dividends will be payable at an annual rate of 6.25%, payable quarterly, in arrears. We may redeem the Series A preferred stock at our option, subject to regulatory approval, on or after July 15, 2021, or following a regulatory capital treatment event, as defined.

Variable Interest Entities

Variable Interest Entities	12 Months Ended
	Dec. 31, 2017
Variable Interest Entity Not Primary Beneficiary Disclosures [Abstract]
Variable Interest Entities	NOTE 27 – Variable Interest Entities Our company’s involvement with VIEs is limited to entities used as investment vehicles and private equity funds, the establishment of Stifel Financial Capital Trusts, and our issuance of a convertible promissory note. We have formed several non-consolidated investment funds with third-party investors that are typically organized as limited liability companies (“LLCs”) or limited partnerships. These partnerships and LLCs have assets of $199.6 million at December 31, 2017. For those funds where we act as the general partner, our company’s economic interest is generally limited to management fee arrangements as stipulated by the fund operating agreements. We have generally provided the third-party investors with rights to terminate the funds or to remove us as the general partner. Management fee revenue earned by our company was insignificant during the years ended December 31, 2017, 2016, and 2015. In addition, our direct investment interest in these entities is insignificant at December 31, 2017 and 2016. Thomas Weisel Capital Management LLC, a subsidiary of our company, acts as the general partner of a series of investment funds in venture capital and fund of funds and manages investment funds that are active buyers of secondary interests in private equity funds, as well as portfolios of direct interests in venture-backed companies. These partnerships have combined assets of $286.0 million at December 31, 2017. We hold variable interests in these funds as a result of our company’s rights to receive management fees. Our company’s investment in and additional capital commitments to the private equity funds are also considered variable interests. The additional capital commitments are subject to call at a later date and are limited in amount. Our exposure to loss is limited to our investments in, advances and commitments to, and receivables due from these funds, and that exposure is insignificant at December 31, 2017. Management fee revenue earned by our company was insignificant during the years ended December 31, 2017, 2016, and 2015. For the entities noted above that were determined to be VIEs, we have concluded that we are not the primary beneficiary, and therefore, we are not required to consolidate these entities. Additionally, for certain other entities, we reviewed other relevant accounting guidance, which states the general partner in a limited partnership is presumed to control that limited partnership. The presumption may be overcome if the limited partners have either: (1) the substantive ability to dissolve the limited partnership or otherwise remove the general partner without cause, or (2) substantive participating rights, which provide the limited partners with the ability to effectively participate in significant decisions that would be expected to be made in the ordinary course of the limited partnership’s business and thereby preclude the general partner from exercising unilateral control over the partnership. If the criteria are not met, the consolidation of the partnership or limited liability company is required. Based on our evaluation of these entities, we determined that these entities do not require consolidation. Debenture to Stifel Financial Capital Trusts We have completed private placements of cumulative trust preferred securities through Stifel Financial Capital Trust II, Stifel Financial Capital Trust III, and Stifel Financial Capital Trust IV (collectively, the “Trusts”). The Trusts are non-consolidated wholly owned business trust subsidiaries of our company and were established for the limited purpose of issuing trust securities to third parties and lending the proceeds to our company. The trust preferred securities represent an indirect interest in junior subordinated debentures purchased from our company by the Trusts, and we effectively provide for the full and unconditional guarantee of the securities issued by the Trusts. We make timely payments of interest to the Trusts as required by contractual obligations, which are sufficient to cover payments due on the securities issued by the Trusts, and believe that it is unlikely that any circumstances would occur that would make it necessary for our company to make payments related to these Trusts other than those required under the terms of the debenture agreements and the trust preferred securities agreements. The Trusts were determined to be VIEs because the holders of the equity investment at risk do not have adequate decision-making ability over the Trust’s activities. Our investment in the Trusts is not a variable interest, because equity interests are variable interests only to the extent that the investment is considered to be at risk. Because our investment was funded by the Trusts, it is not considered to be at risk.

Subsequent Events

Subsequent Events	12 Months Ended
	Dec. 31, 2017
Subsequent Events [Abstract]
Subsequent Events	NOTE 28 – Subsequent Events We evaluate subsequent events that have occurred after the balance sheet date but before the financial statements are issued. There are two types of subsequent events: (1) recognized, or those that provide additional evidence about conditions that existed at the date of the balance sheet, including the estimates inherent in the process of preparing financial statements, and (2) non-recognized, or those that provide evidence about conditions that did not exist at the date of the balance sheet but arose after that date.

Quarterly Financial Information

Quarterly Financial Information	12 Months Ended
	Dec. 31, 2017
Quarterly Financial Information Disclosure [Abstract]
Quarterly Financial Information	NOTE 29 – Quarterly Financial Information (Unaudited) Year Ended December 31, 2017 (in thousands, except per share amounts) 1 st 2 nd 3 rd 4 th Operating revenues $ 590,474 $ 633,340 $ 620,932 $ 697,335 Interest income 100,953 108,951 117,862 126,615 Total revenues 691,427 742,291 738,794 823,950 Interest expense 15,896 16,644 17,625 19,865 Net revenues 675,531 725,647 721,169 804,085 Total non-interest expenses 596,512 642,449 613,030 804,905 Income before income tax expense 79,019 83,198 108,139 (820 ) Provision for income taxes 13,507 30,387 41,603 1,168 Net income 65,512 52,811 66,536 (1,988 ) Preferred dividends 2,344 2,344 2,343 2,344 Net income available to common shareholders $ 63,168 $ 50,467 $ 64,193 $ (4,332 ) Earnings per common share (1) Basic $ 0.92 $ 0.74 $ 0.94 $ (0.06 ) Diluted $ 0.78 $ 0.63 $ 0.79 $ (0.06 ) Weighted-average number of common shares outstanding: Basic 68,386 68,556 68,522 68,782 Diluted 80,695 80,021 80,881 68,782 Cash dividends declared per common share $ — $ — $ 0.10 $ 0.10 Year Ended December 31, 2016 (in thousands, except per share amounts) 1 st 2 nd 3 rd 4 th Operating revenues $ 571,299 $ 603,627 $ 586,488 $ 586,665 Interest income 62,786 65,780 74,881 90,844 Total revenues 634,085 669,407 661,369 677,509 Interest expense 14,111 17,262 19,383 16,118 Net revenues 619,974 652,145 641,986 661,391 Total non-interest expenses 576,061 636,352 614,004 606,497 Income before income tax expense 43,913 15,793 27,982 54,894 Provision for income taxes 16,858 6,022 10,168 28,014 Net income 27,055 9,771 17,814 26,880 Preferred dividends — — 1,563 2,343 Net income available to common shareholders $ 27,055 $ 9,771 $ 16,251 $ 24,537 Earnings per common share Basic $ 0.40 $ 0.15 $ 0.24 $ 0.37 Diluted $ 0.36 $ 0.13 $ 0.21 $ 0.31 Weighted-average number of common shares outstanding: Basic 67,579 66,792 66,482 66,636 Diluted 76,086 75,982 77,544 79,539 Cash dividends declared per common share $ — $ — $ — $ —

Nature of Operations and Basi39

Nature of Operations and Basis Of Presentation (Policies)	12 Months Ended
	Dec. 31, 2017
Organization Consolidation And Presentation Of Financial Statements [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, with a growing presence in Europe. Our major geographic area of concentration is throughout the United States, with a growing presence in the United Kingdom and Europe. Our company’s principal customers are individual investors, corporations, municipalities, and institutions.
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 (“KBW”), and Stifel Bank & Trust (“Stifel Bank”). Unless otherwise indicated, the terms “we,” “us,” “our,” or “our company” in this report refer to Stifel Financial Corp. and its wholly owned subsidiaries. The accompanying consolidated financial statements have been prepared in conformity with U.S. generally accepted accounting principles, which require management to make certain estimates and assumptions that affect the reported amounts. We consider significant estimates, which are most susceptible to change and impacted significantly by judgments, assumptions, and estimates, to be: valuation of financial instruments and investments in partnerships, accrual for contingencies, allowance for loan losses, derivative instruments and hedging activities, fair value of goodwill and intangible assets, provision for income taxes and related tax reserves, and forfeitures associated with stock-based compensation. Actual results could differ from those estimates. 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.
Consolidation Policies	Consolidation Policies The consolidated financial statements include the accounts of Stifel Financial Corp. and its subsidiaries. We also have investments or interests in other entities for which we must evaluate whether to consolidate by determining whether we have a controlling financial interest or are considered to be the primary beneficiary. In determining whether to consolidate these entities, we evaluate whether the entity is a voting interest entity or a variable interest entity (“VIE”). When we do not have a controlling interest in an entity, but we exert significant influence over the entity, we apply the equity method of accounting. All material intercompany balances and transactions have been eliminated in consolidation.
Voting Interest Entity	Voting Interest Entity – Voting interest entities are entities that have (i) total equity investment at risk sufficient to fund expected future operations independently, and (ii) equity holders who have the obligation to absorb losses or receive residual returns and the right to make decisions about the entity’s activities. We consolidate voting interest entities when we determine that there is a controlling financial interest, usually ownership of all, or a majority of, the voting interest.
Variable Interest Entity	Variable Interest Entity – VIEs are entities that lack one or more of the characteristics of a voting interest entity. We are required to consolidate certain VIEs in which we have the power to direct the activities of the entity and the obligation to absorb significant losses or receive significant benefits. In other cases, we consolidate VIEs when we are deemed to be the primary beneficiary. The primary beneficiary is defined as the entity that has a variable interest, or a combination of variable interests, that maintains control and receives benefits or will absorb losses that are not pro rata with its ownership interests. The determination as to whether an entity is a VIE is based on the structure and nature of the entity. We also consider other characteristics, such as the ability to influence the decision-making relative to the entity’s activities and how the entity is financed. With the exception of entities eligible for the deferral codified in Financial Accounting Standards Board (“FASB”) Accounting Standards Update (“ASU”) 2010-10, “Consolidation: Amendments for Certain Investment Funds” (“ASU 2010-10”) (generally asset managers and investment companies), ASC 810 states that a controlling financial interest in an entity is present when an enterprise has a variable interest, or combination of variable interests, that have both the power to direct the activities of the entity that most significantly impact the entity’s economic performance and the obligation to absorb losses of the entity or the rights to receive benefits from the entity that could potentially be significant to the entity. Entities meeting the deferral provision defined by ASU 2010-10 are evaluated under the historical VIE guidance. Under the historical guidance, a controlling financial interest in an entity is present when an enterprise has a variable interest, or combination of variable interests, that will absorb a majority of the entity’s expected losses, receive a majority of the entity’s expected residual returns, or both. The enterprise with a controlling financial interest, known as the primary beneficiary, consolidates the VIE. We determine whether we are the primary beneficiary of a VIE by first performing a qualitative analysis of the VIE’s control structure, expected benefits and losses, and expected residual returns. This analysis includes a review of, among other factors, the VIE’s capital structure, contractual terms, which interests create or absorb benefits or losses, variability, related party relationships, and the design of the VIE. Where a qualitative analysis is not conclusive, we perform a quantitative analysis. We reassess our initial evaluation of an entity as a VIE and our initial determination of whether we are the primary beneficiary of a VIE upon the occurrence of certain reconsideration events. See Note 27 for additional information on VIEs.

Summary Of Significant Accoun40

Summary Of Significant Accounting Policies (Policies)	12 Months Ended
	Dec. 31, 2017
Accounting Policies [Abstract]
Cash and Cash Equivalents	Cash and Cash Equivalents We consider money market mutual funds and highly liquid investments with original maturities of three months or less that are not restricted or segregated to be cash equivalents. Cash and cash equivalents include deposits with banks, federal funds sold, money market mutual funds, and certificates of deposit. Cash and cash equivalents also include balances that Stifel Bank maintains at the Federal Reserve Bank.
Cash Segregated For Regulatory Purposes	Cash Segregated for Regulatory Purposes Our broker-dealer subsidiaries are subject to Rule 15c3-3 under the Securities Exchange Act of 1934, which requires our company to maintain cash or qualified securities in a segregated reserve account for the exclusive benefit of its clients. In accordance with Rule 15c3-3, our company has portions of its cash segregated for the exclusive benefit of clients at December 31, 2017.
Brokerage Client Receivables, Net	Brokerage Client Receivables, Net Brokerage client receivables include receivables of our company’s broker-dealer subsidiaries, which represent amounts due on cash and margin transactions and are generally collateralized by securities owned by clients. Brokerage client receivables, primarily consisting of floating-rate loans collateralized by customer-owned securities, are charged interest at rates similar to other such loans made throughout the industry. The receivables are reported at their outstanding principal balance net of allowance for doubtful accounts. When a brokerage client receivable is considered to be impaired, the amount of the impairment is generally measured based on the fair value of the securities acting as collateral, which is measured based on current prices from independent sources, such as listed market prices or broker-dealer price quotations. Securities owned by customers, including those that collateralize margin or other similar transactions, are not reflected in the consolidated statements of financial condition.
Securities Borrowed and Securities Loaned	Securities Borrowed and Securities Loaned Securities borrowed require our company to deliver cash to the lender in exchange for securities and are included in receivables from brokers, dealers, and clearing organizations in the consolidated statements of financial condition. For securities loaned, we generally receive collateral in the form of cash in an amount in excess of the market value of securities loaned. Securities loaned are included in payables to brokers, dealers, and clearing organizations in the consolidated statements of financial condition. We monitor the market value of securities borrowed and loaned on a daily basis, with additional collateral obtained or refunded as necessary. Fees received or paid are recorded in interest revenue or interest expense in the consolidated statements of operations. Substantially all of these transactions are executed under master netting agreements, which gives us right of offset in the event of counterparty default; however, such receivables and payables with the same counterparty are not set off in the consolidated statements of financial condition.
Securities Purchased Under Agreements to Resell and Repurchase Agreements	Securities Purchased Under Agreements to Resell and Repurchase Agreements Securities purchased under agreements to resell (“resale agreements”) are collateralized financing transactions that are recorded at their contractual amounts plus accrued interest. We obtain control of collateral with a market value equal to or in excess of the principal amount loaned and accrued interest under resale agreements. These agreements are short-term in nature and are generally collateralized by U.S. government securities, U.S. government agency securities, and corporate bonds. We value collateral on a daily basis, with additional collateral obtained when necessary to minimize the risk associated with this activity. Securities sold under agreements to repurchase (“repurchase agreements”) are collateralized financing transactions that are recorded at their contractual amounts plus accrued interest. We make delivery of securities sold under agreements to repurchase and monitor the value of collateral on a daily basis. When necessary, we will deliver additional collateral.
Financial Instruments	Financial Instruments We measure certain financial assets and liabilities at fair value on a recurring basis, including cash equivalents, financial instruments owned, available-for-sale securities, investments, financial instruments sold, but not yet purchased, and derivatives. Other than those separately discussed in the notes to the consolidated financial statements, the remaining financial instruments are generally short-term in nature, and their carrying values approximate fair value. The fair value of a financial instrument is defined as the price that would be received to sell an asset or paid to transfer a liability (i.e., “the exit price”) in an orderly transaction between market participants at the measurement date. We have categorized our financial instruments measured at fair value into a three-level classification in accordance with Topic 820, “Fair Value Measurement,” Level 1 – Quoted prices (unadjusted) are available in active markets for identical assets or liabilities as of the measurement date. A quoted price for an identical asset or liability in an active market provides the most reliable fair value measurement, because it is directly observable to the market. Level 2 – Pricing inputs are other than quoted prices in active markets, which are either directly or indirectly observable as of the measurement date. The nature of these financial instruments includes instruments for which quoted prices are available but traded less frequently, derivative instruments whose fair value have been derived using a model where inputs to the model are directly observable in the market, or can be derived principally from or corroborated by observable market data, and instruments that are fair valued using other financial instruments, the parameters of which can be directly observed. Level 3 – Instruments that have little to no pricing observability as of the measurement date. These financial instruments do not have two-way markets and are measured using management’s best estimate of fair value, where the inputs into the determination of fair value require significant management judgment or estimation. Valuation of Financial Instruments When available, we use observable market prices, observable market parameters, or broker or dealer prices (bid and ask prices) to derive the fair value of financial instruments. In the case of financial instruments transacted on recognized exchanges, the observable market prices represent quotations for completed transactions from the exchange on which the financial instrument is principally traded. A substantial percentage of the fair value of our financial instruments owned, available-for-sale securities, investments, and financial instruments sold, but not yet purchased, are based on observable market prices, observable market parameters, or derived from broker or dealer prices. The availability of observable market prices and pricing parameters can vary from product to product. Where available, observable market prices and pricing or market parameters in a product may be used to derive a price without requiring significant judgment. In certain markets, observable market prices or market parameters are not available for all products, and fair value is determined using techniques appropriate for each particular product. These techniques involve some degree of judgment. For investments in illiquid or privately held securities that do not have readily determinable fair values, the determination of fair value requires us to estimate the value of the securities using the best information available. Among the factors we consider in determining the fair value of investments are the cost of the investment, terms and liquidity, developments since the acquisition of the investment, the sales price of recently issued securities, the financial condition and operating results of the issuer, earnings trends and consistency of operating cash flows, the long-term business potential of the issuer, the quoted market price of securities with similar quality and yield that are publicly traded, and other factors generally pertinent to the valuation of investments. In instances where a security is subject to transfer restrictions, the value of the security is based primarily on the quoted price of a similar security without restriction but may be reduced by an amount estimated to reflect such restrictions. The fair value of these investments is subject to a high degree of volatility and may be susceptible to significant fluctuation in the near term, and the differences could be material. The degree of judgment used in measuring the fair value of financial instruments generally correlates to the level of pricing observability. Pricing observability is impacted by a number of factors, including the type of financial instrument, whether the financial instrument is new to the market and not yet established, and the characteristics specific to the transaction. Financial instruments with readily available active quoted prices for which fair value can be measured from actively quoted prices generally will have a higher degree of pricing observability and a lesser degree of judgment used in measuring fair value. Conversely, financial instruments rarely traded or not quoted will generally have less, or no, pricing observability and a higher degree of judgment used in measuring fair value. See Note 5 for additional information on how we value our financial instruments.
Available-for-Sale and Held-to-Maturity Securities	Available-for-Sale and Held-to-Maturity Securities Securities available for sale, which are carried at fair value, include U.S. government agency securities; state and municipal securities; agency, non-agency, and commercial mortgage-backed securities; corporate fixed income securities; and asset-backed securities, which primarily includes collateralized loan obligations. Securities held to maturity are recorded at amortized cost based on our company’s positive intent and ability to hold these securities to maturity. Securities held to maturity include agency, commercial, and non-agency mortgage-backed securities, asset-backed securities, consisting of collateralized loan obligation securities and ARS, and corporate fixed income securities. We evaluate all securities in an unrealized loss position quarterly to assess whether the impairment is other-than-temporary. Our other-than-temporary impairment (“OTTI”) assessment is a subjective process requiring the use of judgments and assumptions. Accordingly, we consider a number of qualitative and quantitative criteria in our assessment, including the extent and duration of the impairment, recent events specific to the issuer and/or industry to which the issuer belongs, the payment structure of the security, external credit ratings and the failure of the issuer to make scheduled interest or principal payments, the value of underlying collateral, current market conditions, and our company’s ability and intent to hold the investment until its value recovers or the securities mature. We may determine that the decline in fair value of an investment is other-than-temporary if our analysis of these factors indicates that we will not recover our investment in the securities. If we determine that impairment on our debt securities is other-than-temporary and we have made the decision to sell the security or it is more likely than not that we will be required to sell the security prior to recovery of its amortized cost basis, we recognize the entire portion of the impairment in earnings. If we have not made a decision to sell the security and we do not expect that we will be required to sell the security prior to recovery of the amortized cost basis, we recognize only the credit component of OTTI in other operating expenses in the consolidated statements of operations. The remaining unrealized loss due to factors other than credit, or the non-credit component, is recorded in accumulated other comprehensive loss. We determine the credit component based on the difference between the security’s amortized cost basis and the present value of its expected future cash flows, discounted based on the purchase yield. The non-credit component represents the difference between the security’s fair value and the present value of expected future cash flows. We estimate the portion of loss attributable to credit using a discounted cash flow model. Key assumptions used in estimating the expected cash flows include default rates, loss severity, and prepayment rates. Assumptions used can vary widely based on the collateral underlying the securities and are influenced by factors such as collateral type, loan interest rate, geographical location of the borrower, and borrower characteristics. Unrealized gains and losses on our available-for-sale securities are reported, net of taxes, in accumulated other comprehensive loss included in shareholders’ equity. Amortization of premiums and accretion of discounts are recorded as interest income in the consolidated statements of operations using the interest method. Realized gains and losses from sales of securities available for sale are determined on a specific identification basis and are included in other income in the consolidated statements of operations in the period they are sold. For securities transferred from available-for-sale to held-to-maturity, carrying value also includes unrealized gains and losses recognized in accumulated other comprehensive loss at the date of transfer. Such unrealized gains or losses are accreted over the remaining life of the security with no impact on future net income.
Loan Classification	Loan Classification We classify loans based on our investment strategy and management’s assessment of our intent and ability to hold loans for the foreseeable future or until maturity. Management’s intent and ability with respect to certain loans may change from time to time depending on a number of factors, including economic, liquidity, and capital conditions. The accounting and measurement framework for loans differs depending on the loan classification. The classification criteria and accounting and measurement framework for bank loans and loans held for sale are described below. Bank Loans and Allowance for Loan Losses Bank loans consist of commercial and residential mortgage loans, commercial and industrial loans, stock-secured loans, home equity loans, construction loans, and consumer loans originated or acquired by Stifel Bank. Bank loans include those loans that management has the intent and ability to hold and are recorded at outstanding principal adjusted for any charge-offs, allowance for loan losses, deferred origination fees and costs, and purchased discounts. Loan origination costs, net of fees, and premiums and discounts on purchased loans are deferred and recognized over the contractual life of the loan as an adjustment of yield using the interest method. Bank loans are generally collateralized by real estate, real property, marketable securities, or other assets of the borrower. Interest income is recognized using the effective interest rate method, which is based upon the respective interest rates and the average daily asset balance. Discount accretion/premium amortization is recognized using the effective interest rate method, which is based upon the respective interest rate and expected lives of loans. We regularly review the loan portfolio and have established an allowance for loan losses for inherent losses estimated to have occurred in the loan portfolio through a provision for loan losses charged to other operating expenses in the consolidated statements of operations. In providing for the allowance for loan losses, we consider historical loss experience, the nature and volume of the loan portfolio, adverse situations that may affect the borrower’s ability to repay, estimated value of any underlying collateral, and prevailing economic conditions. This evaluation is inherently subjective, as it requires estimates that are susceptible to significant revision as more information becomes available. Loans Held for Sale Loans that we intend to sell or for which we do not have the ability and intent to hold for the foreseeable future are classified as held for sale. Loans held for sale consist of fixed-rate and adjustable-rate residential and multi-family real estate mortgage loans intended for sale. Loans held for sale are stated at lower of cost or market value on an individual loan basis. Declines in market value below cost and any gains or losses on the sale of these assets are recognized in other income in the consolidated statements of operations. Market value is determined based on prevailing market prices for loans with similar characteristics or on sale contract prices. Deferred fees and costs related to these loans are not amortized but are recognized as part of the cost basis of the loan at the time it is sold. Because loans held for sale are reported at lower of cost or market value, an allowance for loan losses is not established for loans held for sale.
Impaired Loans	Impaired Loans A loan is considered impaired when, based on current information and events, it is probable that the scheduled payments of principal or interest when due according to the contractual terms of the loan agreement will not be collectible. Factors considered in determining impairment include payment status, collateral value, and the probability of collecting scheduled principal and interest payments when due. Loans that experience insignificant payment delays and payment shortfalls generally are not classified as impaired. We determine the significance of payment delays and payment shortfalls on a case-by-case basis, taking into consideration all of the circumstances surrounding the loan and the borrower, including the length of the delay, the reasons for the delay, the borrower's prior payment record, and the amount of the shortfall in relation to the principal and interest owed. We consider a loan a trouble debt restructuring when an existing borrower is granted concessionary rates or terms, which would not otherwise be offered. The concessions granted do not reflect current market conditions for a new loan of similar risk to another borrower in similar financial circumstances. Once a loan is determined to be impaired, when principal or interest becomes 90 days past due or when collection becomes uncertain, the accrual of interest and amortization of deferred loan origination fees is discontinued (“non-accrual status”) and any accrued and unpaid interest income is reversed. Loans placed on non-accrual status are returned to accrual status when all delinquent principal and interest payments are collected and the collectibility of future principal and interest payments is reasonably assured. Loan losses are charged against the allowance for loan losses when we believe the uncollectibility of a loan balance is certain. Subsequent recoveries, if any, are credited to the allowance for loan losses. Large groups of smaller balance homogenous loans are collectively evaluated for impairment. Accordingly, we do not separately identify individual consumer and residential loans for impairment measurements. Impairment is measured on a loan-by-loan basis for non-homogeneous loans, and a specific allowance is established for individual loans determined to be impaired. Impairment is measured by comparing the carrying value of the impaired loan to the present value of its expected cash flow discounted at the loan’s effective interest rate, the loan’s observable market price, or the fair value of the collateral if the loan is collateral dependent.
Investments	Investments Our broker-dealer subsidiaries report changes in fair value of marketable and non-marketable securities in other income in the consolidated statements of operations. The fair value of marketable investments is generally based on either quoted market or dealer prices. The fair value of non-marketable securities is based on management’s estimate using the best information available, which generally consists of quoted market prices for similar securities and internally developed discounted cash flow models. Investments in the consolidated statements of financial condition contain investments in securities that are marketable and securities that are not readily marketable. These investments are not included in our broker-dealer trading inventory or available-for-sale or held-to-maturity portfolios and represent the acquiring and disposing of debt or equity instruments for our benefit.
Fixed Assets, Net	Fixed Assets, Net Office equipment is depreciated on a straight-line basis over the estimated useful life of the asset of two to seven years. Leasehold improvements are amortized on a straight-line basis over the lesser of the estimated useful life of the asset or the term of the lease. Buildings and building improvements are amortized on a straight-line basis over the estimated useful life of the asset of three to thirty-nine years. Depreciation expense is recorded in occupancy and equipment rental expense in the consolidated statements of operations. Office equipment, leasehold improvements, and property are stated at cost net of accumulated depreciation and amortization in the consolidated statements of financial condition. Office equipment is reviewed for impairment whenever events or changes in circumstances indicate that the carrying amount of such assets may not be recoverable.
Goodwill and Intangible Assets	Goodwill and Intangible Assets Goodwill represents the cost of acquired businesses in excess of the fair value of the related net assets acquired. We test goodwill for impairment on an annual basis and on an interim basis when certain events or circumstances exist. We test for impairment at the reporting unit level, which is generally at the level of or one level below our company’s business segments. For both the annual and interim tests, we have the option to first assess qualitative factors to determine whether the existence of events or circumstances leads to a determination that it is more likely than not that the fair value of a reporting unit is less than its carrying amount. If, after assessing the totality of events or circumstances, we determine it is more likely than not that the fair value of a reporting unit is greater than its carrying amount, then performing the two-step impairment test is not required. However, if we conclude otherwise, we are then required to perform the first step of the two-step impairment test. Goodwill impairment is determined by comparing the estimated fair value of a reporting unit with its respective carrying value. If the estimated fair value exceeds the carrying value, goodwill at the reporting unit level is not deemed to be impaired. If the estimated fair value is below carrying value, however, further analysis is required to determine the amount of the impairment. Additionally, if the carrying value of a reporting unit is zero or a negative value and it is determined that it is more likely than not the goodwill is impaired, further analysis is required. The estimated fair values of the reporting units are derived based on valuation techniques we believe market participants would use for each of the reporting units. During 2017, the Company decided that it would change its annual impairment test date from July 31st to October 1st. The Company performed impairment testing on both July 31, 2017 and October 1, 2017 with no impairment charges resulting from the annual impairment tests. The Company believes that changing its annual impairment test date to the beginning of the fourth fiscal quarter will allow it to have carrying amounts that are more readily available as of the last day of the prior fiscal quarter and give the Company a full quarter to assess if it has a potential impairment (qualitative assessment and/or Step 1) and complete the measurement (Step 2), if required. Identifiable intangible assets, which are amortized over their estimated useful lives, are tested for potential impairment whenever events or changes in circumstances suggest that the carrying value of an asset or asset group may not be fully recoverable.
Loan and Advances to Financial Advisors and Other Employees, Net	Loans and Advances to Financial Advisors and Other Employees, Net We offer transition pay, principally in the form of upfront loans, to financial advisors and certain key revenue producers as part of our company’s overall growth strategy. These loans are generally forgiven by a charge to compensation and benefits over a five- to ten-year period if the individual satisfies certain conditions, usually based on continued employment and certain performance standards. We monitor and compare individual financial advisor production to each loan issued to ensure future recoverability. If the individual leaves before the term of the loan expires or fails to meet certain performance standards, the individual is required to repay the balance. In determining the allowance for doubtful receivables from former employees, management considers the facts and circumstances surrounding each receivable, including the amount of the unforgiven balance, the reasons for the terminated employment relationship, and the former employees’ overall financial situation.
Derivative Instruments And Hedging Activities	Derivative Instruments and Hedging Activities We recognize all of our derivative instruments at fair value as either assets or liabilities in the consolidated statements of financial condition. These instruments are recorded in other assets or accounts payable and accrued expenses in the consolidated statements of financial condition and in the operating section of the consolidated statements of cash flows as increases or decreases of other assets and accounts payable and accrued expenses. Our company’s policy is not to offset fair value amounts recognized for derivative instruments and fair value amounts recognized for the right to reclaim cash collateral or the obligation to return cash collateral arising from derivative instruments recognized at fair value executed with the same counterparty under master netting arrangements. The accounting for changes in the fair value (i.e., gains and losses) of a derivative instrument depends on whether it has been designated and qualifies as part of a hedging relationship and, further, on the type of hedging relationship. For those derivative instruments that are designated and qualify as hedging instruments, we must also designate the hedging instrument or transaction, based upon the exposure being hedged. For derivative instruments that are designated and qualify as cash flow hedges (i.e., hedging the exposure to variability in expected future cash flows that is attributable to a particular risk), the effective portion of the gain or loss on the derivative instrument is reported as a component of accumulated other comprehensive loss, net of tax, and reclassified into earnings in the same period or periods during which the hedged transaction affects earnings. The remaining gain or loss on the derivative instrument in excess of the cumulative change in the present value of future cash flows of the hedged item, if any, is recognized in current earnings during the period of change. We do not use derivatives for trading or speculative purposes and, at December 31, 2017, all of our derivatives are designated as cash flow hedges. See Note 14 for additional details.
Revenue Recognition	Revenue Recognition Customer securities transactions are recorded on a settlement date basis, with related commission revenues and expenses recorded on a trade date basis. Commission revenues are recorded as the amount charged to the customer, which, in certain cases, may include varying discounts. Principal securities transactions are recorded on a trade date basis. We typically distribute our proprietary equity research products to our client base of institutional investors at no charge. These proprietary equity research products are accounted for as a cost of doing business. Investment banking revenues, which include underwriting fees, management fees, advisory fees, placement fees, and sales credits earned in connection with the distribution of the underwritten securities, are recorded when services for the transactions are completed under the terms of each engagement. Expenses associated with such transactions are deferred until the related revenue is recognized or the engagement is otherwise concluded. Investment banking revenues are presented net of related unreimbursed expenses. We have not recognized any incentive income that is subject to contingent repayments. Asset management and service fees are recorded when earned, based on the period-end assets in the accounts, and consist of customer account service fees, per account fees (such as IRA fees), and wrap fees, net of external manager costs on managed accounts. We earn fees from the investment partnerships that we manage or of which we are a general partner. Such management fees are generally based on the net assets or committed capital of the underlying partnerships. We have agreed, in certain cases, to waive management fees, in lieu of making a cash contribution, in satisfaction of our general partner investment commitments to the investment partnerships. In these cases, we generally recognize our management fee revenues at the time when we are allocated a special profit interest in realized gains from these partnerships.
Direct Financing And Operating Leases	Operating Leases We lease office space and equipment under operating leases. We recognize rent expense related to these operating leases on a straight-line basis over the lease term. The lease term commences on the earlier of the date when we become legally obligated for the rent payments or the date on which we take possession of the property. For tenant improvement allowances and rent holidays, we record a deferred rent liability in accounts payable and accrued expenses in the consolidated statements of financial condition and amortize the deferred rent over the lease term as a reduction to occupancy and equipment rental expense in the consolidated statements of operations.
Income Taxes	Income Taxes On December 22, 2017, the Tax Cuts and Jobs Act of 2017 (“Tax Legislation”) was signed into law making significant changes to the Internal Revenue Code. Changes include, but are not limited to, a corporate tax rate decrease from 35% to 21% effective for tax years beginning after December 31, 2017, the transition of U.S international taxation from a worldwide tax system to a territorial system, and a one-time transition tax on the mandatory deemed repatriation of cumulative foreign earnings as of December 31, 2017. In December 2017, the SEC staff issued Staff Accounting Bulletin No. 118, Income Tax Accounting Implications of the Tax Cuts and Jobs Act (“SAB 118”), which allows us to record provisional amounts during a measurement period not to extend beyond one year of the enactment date. We compute income taxes using the asset and liability method, under which deferred income taxes are provided for the temporary differences between the financial statement carrying amounts and the tax basis of our company’s assets and liabilities. We establish a valuation allowance for deferred tax assets if it is more likely than not that these items will either expire before we are able to realize their benefits, or that future deductibility is uncertain. We recognize the tax benefit from an uncertain tax position only if it is more likely than not that the tax position will be sustained on examination by the taxing authorities, based on the technical merits of the position. The tax benefits recognized in the consolidated financial statements from such a position are measured based on the largest benefit that has a greater than 50% likelihood of being realized upon ultimate settlement. We recognize interest and penalties related to uncertain tax positions in provision for income taxes in the consolidated statements of operations. See Note 23 for further information regarding income taxes.
Foreign Currency Translation	Foreign Currency Translation We consolidate our foreign subsidiaries, which have designated their local currency as their functional currency. Assets and liabilities of these foreign subsidiaries are translated at year-end rates of exchange. Revenues and expenses are translated at an average rate for the period. In accordance with FASB Accounting Standards Codification Topic 830, “Foreign Currency Matters,”
Recently Issued Accounting Guidance	Recently Issued Accounting Guidance Comprehensive Income In February 2018, the FASB issued ASU 2018-02, “Income Statement - Reporting Comprehensive Income (Topic 220): Reclassification of Certain Tax Effects from Accumulated Other Comprehensive Income” that provides for the reclassification from accumulated other comprehensive income to retained earnings for stranded effects resulting from the Tax Cuts and Jobs Act of 2017. The accounting update is effective for the fiscal year beginning after December 15, 2018 (January 1, 2019 for our company) and early adoption is permitted. The accounting update should be applied either in the period of adoption or retrospectively to each period in which the effect of the change in the U.S. federal corporate income tax rate in the Tax Act of 2017 is recognized. We are currently evaluating the impact of the accounting update, but the adoption is not expected to have a material impact on our consolidated financial statements. Derivatives and Hedging In August 2017, the FASB issued ASU 2017-12, “Targeted Improvements to Accounting for Hedging Activities,” which amends the hedge accounting recognition and presentation requirements. The accounting update improves the transparency and understandability of information conveyed to financial statement users by better aligning companies’ hedging relationship to their existing risk management strategies, simplifies the application of hedge accounting and increases transparency regarding the scope and results of hedging program. The accounting update is effective for the fiscal year beginning after December 15, 2019 (January 1, 2019 for our company) and early adoption is permitted. The Company will not early adopt this accounting update. We are currently evaluating the impact of the accounting update, but the adoption is not expected to have a material impact on our consolidated financial statements. Callable debt securities In March 2017, the FASB issued ASU 2017-08, “Receivables - Nonrefundable Fees and Other Costs (Subtopic 310-20): Premium Amortization on Purchased Callable Debt Securities,” which shortens the amortization period for the premium on certain callable debt securities to the earliest call date. The amendments are applicable to any purchased individual debt security with an explicit and non-contingent call feature that is callable at a fixed price on a preset date. The accounting update is effective for fiscal years beginning after December 15, 2018 (January 1, 2019 for our company) under a modified retrospective approach and early adoption is permitted. We are evaluating the impact the adoption of this new guidance will have on our consolidated financial statements. Goodwill Impairment Testing In January 2017, the FASB issued ASU 2017-04, “Intangibles - Goodwill and Other (Topic 350): Simplifying the Test for Goodwill Impairment,” which simplifies the subsequent measurement of goodwill and eliminates Step 2 from the goodwill impairment test. Under the accounting update, the annual, or interim, goodwill impairment test is performed by comparing the fair value of a reporting unit with its carrying amount, and an impairment charge should be recognized for the amount by which the carrying amount exceeds the reporting unit’s fair value; however, the loss recognized should not exceed the total amount of goodwill allocated to that reporting unit. The accounting update is effective for annual or any interim impairment tests in fiscal years beginning after December 15, 2019 (January 1, 2020 for our company) and early adoption is permitted. We are currently evaluating the impact of the accounting update, but the adoption is not expected to have a material impact on our consolidated financial statements. Statement of Cash Flow In November 2016, the FASB issued ASU 2016-18, “Statement of Cash Flow - Restricted Cash,” which adds or clarifies guidance on the classification and presentation of restricted cash in the statement of cash flows. The accounting update is effective for the fiscal year beginning after December 15, 2017 (January 1, 2018 for our Company). The accounting update is not expected to have a material impact on our consolidated financial statements. In August 2016, the FASB issued ASU 2016-15, “Classification of Certain Cash Receipts and Cash Payments,” which amends and clarifies the current guidance to reduce diversity in practice of the classification of certain cash receipts and payments in the consolidated statements of cash flows. The accounting update is effective for the fiscal year beginning after December 31, 2017 (January 1, 2018 for our company). The accounting update is not expected to have a material impact on our consolidated financial statements. Financial Instruments – Credit Losses In June 2016, the FASB issued ASU 2016-13, “Financial Instruments − Credit Losses (Topic 326): Measurement of Credit Losses on Financial Instruments.” This accounting update impacts the impairment model for certain financial assets measured at amortized cost by requiring a current expected credit loss (“CECL”) methodology to estimate expected credit losses over the entire life of the financial asset, recorded at inception or purchase. CECL will replace the loss model currently applicable to bank loans, held-to-maturity securities, and other receivables carried at amortized cost. The accounting update also eliminates the concept of other-than-temporary impairment for available-for-sale securities. Impairments on available-for-sale securities will be required to be recognized in earnings through an allowance, when the fair value is less than amortized cost and a credit loss exists or the securities are expected to be sold before recovery of amortized cost. Under the accounting update, there may be an ability to determine there are no expected credit losses in certain circumstances, e.g., based on collateral arrangements for lending and financing transactions or based on the credit quality of the borrower or issuer. Overall, the amendments in this accounting update are expected to accelerate the recognition of credit losses for portfolios where CECL models will be applied. The accounting update is effective for fiscal years beginning after December 15, 2019 (January 1, 2020 for our company) with early adoption permitted as of January 1, 2019. We are currently evaluating the impact of the accounting update, but the adoption is not expected to have a material impact on our consolidated financial statements. Leases In February 2016, the FASB issued ASU 2016-02, “Leases” that requires for leases longer than one year, a lessee recognize in the statements of financial condition a right-of-use asset, representing the right to use the underlying asset for the lease term, and a lease liability, representing the liability to make lease payments. The accounting update also requires that for finance leases, a lessee recognize interest expense on the lease liability, separately from the amortization of the right-of-use asset in the statements of earnings, while for operating leases, such amounts should be recognized as a combined expense. In addition, this accounting update requires expanded disclosures about the nature and terms of lease agreements. The accounting update is effective for fiscal years beginning after December 15, 2018 (January 1, 2019 for our company) under a modified retrospective approach and early adoption is permitted. The Company’s implementation efforts include reviewing existing leases and service contracts, which may include embedded leases. Upon adoption, our company expects a gross up on its consolidated statements of financial condition upon recognition of the right-of-use assets and lease liabilities and does not expect the amount of the gross up to have a material impact on its financial condition. Financial Assets and Financial Liabilities In January 2016, the FASB issued ASU 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 accounting update also amends certain disclosure requirements associated with the fair value of financial instruments. The accounting update is effective for fiscal years beginning after December 15, 2017 (January 1, 2018 for our company). The accounting update is not expected to have a material impact on our consolidated financial statements. Revenue Recognition In May 2014, the FASB issued ASU 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, as amended, 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 Company will adopt the accounting update effective as of January 1, 2018 using the modified retrospective method, with a cumulative effect adjustment to opening retained earnings. The cumulative effect that the Company will recognize as an adjustment to retained earnings upon adoption is not material to our consolidated financial statements. Accordingly, the new revenue standard will be applied prospectively in our consolidated financial statements from January 1, 2018 forward and reported financial information for historical comparable periods will not be revised and will continue to be reported under the accounting standards in effect during those historical periods. This accounting update will change the presentation of certain costs related to underwriting and advisory activities so that such costs will be recorded in the relevant non-interest expense line item versus the current practice of netting such costs against Investment banking revenues. In addition, there may be certain situations where advisory fees are deferred and not recognized, dependent upon performance obligations. This change will not materially impact our company’s earnings, however, we will report higher revenues and higher non-compensation operating expenses. The scope of the accounting update does not apply to revenue associated with financial instruments, and as a result, will not have an impact on the elements of our consolidated statements of operations most closely associated with financial instruments, including Principal transaction revenues, Interest income, and Interest expense. The adoption of the accounting update will not have a material impact on the Company’s consolidated financial statements.
Recently Adopted Accounting Guidance	Recently Adopted Accounting Guidance Share-Based Payments In March 2016, the FASB issued ASU 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 adopted the guidance in the update on January 1, 2017. Cash paid to a tax authority by a company when withholding shares from an employee’s award for tax-withholding purposes are now classified as a financing activity in the accompanying consolidated statement of cash flows (adopted retrospectively). We reclassified $61.6 million and $65.0 million from operating activities to financing activities in the accompanying consolidated statement of cash flows for the years ended December 31, 2016 and 2015, respectively, pertaining to shares withheld from employee awards for tax withholding purposes.

Receivables From And Payables41

Receivables From And Payables To Brokers, Dealers And Clearing Organizations (Tables)	12 Months Ended
	Dec. 31, 2017
Due To And From Broker Dealers And Clearing Organizations [Abstract]
Amounts Receivable From Brokers, Dealers, And Clearing Organizations	Amounts receivable from brokers, dealers, and clearing organizations at December 31, 2017 and 2016, included (in thousands) December 31, 2017 2016 Receivables from clearing organizations $ 270,285 $ 568,373 Deposits paid for securities borrowed 132,776 382,691 Securities failed to deliver 56,046 73,688 $ 459,107 $ 1,024,752
Amounts Payable To Brokers, Dealers, And Clearing Organizations	Amounts payable to brokers, dealers, and clearing organizations at December 31, 2017 and 2016, included (in thousands) December 31, 2017 2016 Deposits received from securities loaned $ 219,782 $ 478,814 Securities failed to receive 29,297 27,882 Payable to clearing organizations 27,223 16,411 $ 276,302 $ 523,107

Fair Value Measurements (Tables

Fair Value Measurements (Tables)	12 Months Ended
	Dec. 31, 2017
Fair Value Disclosures [Abstract]
Schedule Of Fair Value Of Investments In And Unfunded Commitments To Funds Measured At Net Asset Value	December 31, 2017 December 31, 2016 Fair value of investments Unfunded commitments Fair value of investments Unfunded commitments Money market funds $ 77,441 $ — $ 35,637 $ — Mutual funds 11,748 — 11,301 — Private equity funds 7,677 1,825 9,310 2,020 Partnership interests 5,124 1,330 15,798 1,822 Private company investments — — 18,763 8,526 Total $ 101,990 $ 3,155 $ 90,809 $ 12,368
Fair Value Of Assets And Liabilities Measured On Recurring Basis	December 31, 2017 Total Level 1 Level 2 Level 3 Financial instruments owned: U.S. government securities $ 13,466 $ 13,466 $ — $ — U.S. government agency securities 147,223 — 147,223 — Mortgage-backed securities: Agency 329,691 — 329,691 — Non-agency 75,154 — 74,796 358 Corporate securities: Fixed income securities 329,179 362 328,575 242 Equity securities 46,802 46,411 138 253 Sovereign debt 32,470 — 32,470 — State and municipal securities 169,699 — 169,699 — Total financial instruments owned 1,143,684 60,239 1,082,592 853 Available-for-sale securities: U.S. government agency securities 4,983 516 4,467 — State and municipal securities 70,559 — 70,559 — Mortgage-backed securities: Agency 305,530 — 305,530 — Commercial 72,488 — 72,488 — Non-agency 1,568 — 1,568 — Corporate fixed income securities 1,211,442 — 1,211,442 — Asset-backed securities 2,106,938 — 2,106,938 — Total available-for-sale securities 3,773,508 516 3,772,992 — Investments: Corporate equity securities 49,978 49,978 — — Auction rate securities: Equity securities 34,789 — — 34,789 Municipal securities 846 — — 846 Other 1,217 — 360 857 Investments measured at NAV 24,549 Total investments 111,379 49,978 360 36,492 Cash equivalents measured at NAV 77,441 Derivative contracts (1) 7,995 — 7,995 — $ 5,114,007 $ 110,733 $ 4,863,939 $ 37,345 (1) Included in other assets in the consolidated statements of financial condition. December 31, 2017 Total Level 1 Level 2 Level 3 Liabilities: Financial instruments sold, but not yet purchased: U.S. government securities $ 442,402 $ 442,402 $ — $ — U.S. government agency securities 10,348 — 10,348 — Mortgage-backed securities: Agency 86,612 — 86,612 — Corporate securities: Fixed income securities 180,755 — 180,755 — Equity securities 38,510 38,070 440 — Sovereign debt 20,236 — 20,236 — Total financial instruments sold, but not yet purchased $ 778,863 $ 480,472 $ 298,391 $ — Assets and liabilities measured at fair value on a recurring basis as of December 31, 2016, are presented below (in thousands) December 31, 2016 Total Level 1 Level 2 Level 3 Financial instruments owned: U.S. government securities $ 9,951 $ 9,951 $ — $ — U.S. government agency securities 89,833 — 89,833 — Mortgage-backed securities: Agency 305,774 — 305,774 — Non-agency 28,402 — 27,320 1,082 Corporate securities: Fixed income securities 269,561 1,944 267,344 273 Equity securities 32,044 31,444 — 600 Sovereign debt 30,385 — 30,385 — State and municipal securities 159,095 — 159,095 — Total financial instruments owned 925,045 43,339 879,751 1,955 Available-for-sale securities: U.S. government agency securities 4,197 300 3,897 — State and municipal securities 72,490 — 72,490 — Mortgage-backed securities: Agency 338,732 — 338,732 — Commercial 72,773 — 72,773 — Non-agency 1,892 — 1,892 — Corporate fixed income securities 823,511 — 823,511 — Asset-backed securities 1,867,718 — 1,867,718 — Total available-for-sale securities 3,181,313 300 3,181,013 — Investments: Corporate equity securities 27,247 23,414 — 3,833 Auction rate securities: Equity securities 48,689 — — 48,689 Municipal securities 832 — — 832 Other 1,623 — 383 1,240 Investments measured at NAV 55,172 Total investments 133,563 23,414 383 54,594 Cash equivalents measured at NAV 35,637 Derivative contracts (1) 10,390 — 10,390 — $ 4,285,948 $ 67,053 $ 4,071,537 $ 56,549 (1) Included in other assets in the consolidated statements of financial condition. December 31, 2016 Total Level 1 Level 2 Level 3 Liabilities: Financial instruments sold, but not yet purchased: U.S. government securities $ 362,536 $ 362,536 $ — $ — U.S. government agency securities 20,549 — 20,549 — Mortgage-backed securities: Agency 94,552 — 94,552 — Non-agency 1 — 1 — Corporate securities: Fixed income securities 175,301 980 174,321 — Equity securities 18,395 18,395 — — Sovereign debt 27,667 — 27,667 — State and municipal securities 31 — 31 — Total financial instruments sold, but not yet purchased 699,032 381,911 317,121 — Derivative contracts (2) 1,823 — 1,823 — $ 700,855 $ 381,911 $ 318,944 $ — (2) Included in accounts payable and accrued expenses in the consolidated statements of financial condition.
Schedule Of Changes In Fair Value Associated With Level 3 Financial Instruments	Year Ended December 31, 2017 Financial instruments owned Investments Mortgage- Backed Securities – Non-Agency Corporate Fixed Income Securities Equity Securities Corporate Equity Securities Auction Rate Securities – Equity Auction Rate Securities – Municipal Other Balance at December 31, 2016 $ 1,082 $ 273 $ 600 $ 3,833 $ 48,689 $ 832 $ 1,240 Unrealized gains/(losses): Included in changes in net assets (1) (260 ) — (88 ) (133 ) 785 14 — Realized gains/(losses) (1) 90 — (259 ) 13 — — (383 ) Purchases — — — — — — — Sales (324 ) — — (120 ) — — — Redemptions (230 ) (31 ) — — — — — Transfers: Into Level 3 — — — — — — — Out of Level 3 — — — (3,593 ) (14,685 ) — — Net change (724 ) (31 ) (347 ) (3,833 ) (13,900 ) 14 (383 ) Balance at December 31, 2017 $ 358 $ 242 $ 253 $ — $ 34,789 $ 846 $ 857 (1) Realized and unrealized gains/(losses) related to financial instruments owned and investments are reported in other income in the consolidated statements of operations. Year Ended December 31, 2016 Financial instruments owned Investments Mortgage- Backed Securities – Non-Agency Corporate Fixed Income Securities Equity Securities Corporate Equity Securities Auction Rate Securities – Equity Auction Rate Securities – Municipal Other Balance at December 31, 2015 $ 1,476 $ — $ 619 $ 2,942 $ 50,442 $ 1,315 $ 20 Unrealized gains/(losses): Included in changes in net assets (1) (18 ) — (279 ) (361 ) 547 67 — Realized gains (1) 54 — — 2,453 — — — Purchases — 292 253 3,593 50 — 3,782 Sales — — — — — — — Redemptions (430 ) (19 ) — (4,794 ) (2,350 ) (550 ) — Transfers: Into Level 3 — — 7 — — — 465 Out of Level 3 — — — — — — (3,027 ) Net change (394 ) 273 (19 ) 891 (1,753 ) (483 ) 1,220 Balance at December 31, 2016 $ 1,082 $ 273 $ 600 $ 3,833 $ 48,689 $ 832 $ 1,240 (1) Realized and unrealized gains/(losses) related to financial instruments owned and investments are reported in other income in the consolidated statements of operations.
Quantitative Information Related To The Significant Unobservable Inputs Utilized In Level 3 Recurring Fair Value Measurements	Valuation technique Unobservable input Range Weighted average Investments: Auction rate securities: Equity securities Discounted cash flow Discount rate 0.8% to 9.8% 4.8% Workout period 1-3 years 2.2 years Municipal securities Discounted cash flow Discount rate 1.0% to 9.1% 3.4% Workout period 1-4 years 1.9 years
Schedule Of Fair Value Of Financial Instruments	December 31, 2017 December 31, 2016 Carrying Value Estimated Fair Value Carrying Value Estimated Fair Value Financial assets: Cash and cash equivalents $ 696,283 $ 696,283 $ 912,932 $ 912,932 Cash segregated for regulatory purposes 90,802 90,802 73,235 73,235 Securities purchased under agreements to resell 512,220 512,220 248,588 248,588 Financial instruments owned 1,143,684 1,143,684 925,045 925,045 Available-for-sale securities 3,773,508 3,773,508 3,181,313 3,181,313 Held-to-maturity securities 3,698,098 3,710,478 3,038,405 3,040,554 Loans held for sale 226,068 226,068 228,588 228,588 Bank loans 6,947,759 6,953,328 5,591,190 5,633,804 Investments 111,379 111,379 133,563 133,563 Derivative contracts (1) 7,995 7,995 10,390 10,390 Financial liabilities: Securities sold under agreements to repurchase $ 233,704 $ 233,704 $ 268,546 $ 268,546 Bank deposits 13,411,935 12,702,746 11,527,483 11,092,185 Financial instruments sold, but not yet purchased 778,863 778,863 699,032 699,032 Derivative contracts (2) — — 1,823 1,823 Borrowings 256,000 256,000 377,000 377,000 Federal Home Loan Bank advances 745,000 745,000 500,000 500,000 Senior notes 1,014,940 1,044,768 795,891 799,632 Debentures to Stifel Financial Capital Trusts 67,500 64,962 67,500 52,525 (1) (2) Included in accounts payable and accrued expenses in the consolidated statements of financial condition.
Estimated Fair Values Of Financial Instruments Not Measured At Fair Value	December 31, 2017 Total Level 1 Level 2 Level 3 Financial assets: Cash $ 618,842 $ 618,842 $ — $ — Cash segregated for regulatory purposes 90,802 90,802 — — Securities purchased under agreements to resell 512,220 428,740 83,480 — Held-to-maturity securities 3,710,478 — 3,517,781 192,697 Loans held for sale 226,068 — 226,068 — Bank loans 6,953,328 — 6,953,328 — Financial liabilities: Securities sold under agreements to repurchase $ 233,704 $ 92,278 $ 141,426 $ — Bank deposits 12,702,746 — 12,702,746 — Borrowings 256,000 256,000 — — Federal Home Loan Bank advances 745,000 745,000 — — Senior notes 1,044,768 1,044,768 — — Debentures to Stifel Financial Capital Trusts 64,962 — — 64,962 December 31, 2016 Total Level 1 Level 2 Level 3 Financial assets: Cash $ 877,295 $ 877,295 $ — $ — Cash segregated for regulatory purposes 73,235 73,235 — — Securities purchased under agreements to resell 248,588 227,983 20,605 — Held-to-maturity securities 3,040,554 — 2,830,869 209,685 Loans held for sale 228,588 — 228,588 — Bank loans 5,633,804 — 5,633,804 — Financial liabilities: Securities sold under agreements to repurchase $ 268,546 $ 149,881 $ 118,665 $ — Bank deposits 11,092,185 — 11,092,185 — Borrowings 377,000 377,000 — — Federal Home Loan Bank advances 500,000 500,000 — — Senior notes 799,632 799,632 — — Debentures to Stifel Financial Capital Trusts 52,525 — — 52,525

Financial Instruments Owned A43

Financial Instruments Owned And Financial Instruments Sold, But Not Yet Purchased (Tables)	12 Months Ended
	Dec. 31, 2017
Trading Securities Balance Sheet Reported Amounts [Abstract]
Components Of Trading Securities Owned And Trading Securities Sold, But Not Yet Purchased	The components of financial instruments owned and financial instruments sold, but not yet purchased, at December 31, 2017 and 2016, are as follows (in thousands) December 31, 2017 2016 Financial instruments owned: U.S. government securities $ 13,466 $ 9,951 U.S. government agency securities 147,223 89,833 Mortgage-backed securities: Agency 329,691 305,774 Non-agency 75,154 28,402 Corporate securities: Fixed income securities 329,179 269,561 Equity securities 46,802 32,044 Sovereign debt 32,470 30,385 State and municipal securities 169,699 159,095 $ 1,143,684 $ 925,045 Financial instruments sold, but not yet purchased: U.S. government securities $ 442,402 $ 362,536 U.S. government agency securities 10,348 20,549 Mortgage-backed securities: Agency 86,612 94,552 Non-agency — 1 Corporate securities: Fixed income securities 180,755 175,301 Equity securities 38,510 18,395 Sovereign debt 20,236 27,667 State and municipal securities — 31 $ 778,863 $ 699,032

Available-For-Sale And Held-T44

Available-For-Sale And Held-To-Maturity Securities (Tables)	12 Months Ended
	Dec. 31, 2017
Investments Debt And Equity Securities [Abstract]
Schedule Of Amortized Cost And Fair Values Of Available For Sale Securities And Held To Maturity Securities	The following tables provide a summary of the amortized cost and fair values of the available-for-sale securities and held-to-maturity securities at December 31, 2017 and 2016 (in thousands) December 31, 2017 Amortized Cost Gross Unrealized Gains (1) Gross Unrealized Losses (1) Estimated Fair Value Available-for-sale securities U.S. government agency securities $ 5,022 $ — $ (39 ) $ 4,983 State and municipal securities 74,691 — (4,132 ) 70,559 Mortgage-backed securities: Agency 308,409 102 (2,981 ) 305,530 Commercial 75,548 28 (3,088 ) 72,488 Non-agency 1,568 — — 1,568 Corporate fixed income securities 1,213,262 3,832 (5,652 ) 1,211,442 Asset-backed securities 2,098,958 12,877 (4,897 ) 2,106,938 $ 3,777,458 $ 16,839 $ (20,789 ) $ 3,773,508 Held-to-maturity securities (2) Mortgage-backed securities: Agency $ 1,334,833 $ 13,621 $ (16,208 ) $ 1,332,246 Commercial 58,971 1,313 — 60,284 Asset-backed securities 2,264,283 15,526 (1,862 ) 2,277,947 Corporate fixed income securities 40,011 27 (37 ) 40,001 $ 3,698,098 $ 30,487 $ (18,107 ) $ 3,710,478 December 31, 2016 Amortized Cost Gross Unrealized Gains (1) Gross Unrealized Losses (1) Estimated Fair Value Available-for-sale securities U.S. government agency securities $ 4,213 $ 2 $ (18 ) $ 4,197 State and municipal securities 76,066 — (3,576 ) 72,490 Mortgage-backed securities: Agency 340,738 298 (2,304 ) 338,732 Commercial 77,417 59 (4,703 ) 72,773 Non-agency 2,032 — (140 ) 1,892 Corporate fixed income securities 830,695 1,418 (8,602 ) 823,511 Asset-backed securities 1,858,929 9,857 (1,068 ) 1,867,718 $ 3,190,090 $ 11,634 $ (20,411 ) $ 3,181,313 Held-to-maturity securities (2) Mortgage-backed securities: Agency $ 1,567,758 $ 14,537 $ (17,037 ) $ 1,565,258 Commercial 59,581 1,786 — 61,367 Non-agency 688 — (13 ) 675 Asset-backed securities 1,370,300 6,242 (3,396 ) 1,373,146 Corporate fixed income securities 40,078 30 — 40,108 $ 3,038,405 $ 22,595 $ (20,446 ) $ 3,040,554 (1) Unrealized gains/(losses) related to available-for-sale securities are reported in accumulated other comprehensive loss. (2) Held-to-maturity securities are carried in the consolidated statements of financial condition at amortized cost, and the changes in the value of these securities, other than impairment charges, are not reported on the consolidated financial statements.
Schedule Of Amortized Cost And Fair Values Of Debt Securities By Contractual Maturity	The table below summarizes the amortized cost and fair values of debt securities by contractual maturity (in thousands) December 31, 2017 Available-for-sale securities Held-to-maturity securities Amortized Cost Estimated Fair Value Amortized Cost Estimated Fair Value Debt securities Within one year $ 184,101 $ 184,021 $ 40,011 $ 40,001 After one year through three years 229,680 229,627 — — After three years through five years 318,964 316,198 — — After five years through ten years 920,147 922,763 403,840 405,319 After ten years 1,739,041 1,741,313 1,860,443 1,872,628 Mortgage-backed securities After three years through five years — — 58,971 60,284 After five years through ten years 58,263 55,824 143,715 141,770 After ten years 327,262 323,762 1,191,118 1,190,476 $ 3,777,458 $ 3,773,508 $ 3,698,098 $ 3,710,478
Contractual Maturities	The maturities of our available-for-sale (fair value) and held-to-maturity (amortized cost) securities at December 31, 2017, are as follows (in thousands) Within 1 Year 1-5 Years 5-10 Years After 10 Years Total Available-for-sale: (1) U.S. government agency securities $ 1,722 $ 3,261 $ — $ — $ 4,983 State and municipal securities 274 84 18,745 51,456 70,559 Mortgage-backed securities: Agency — — 338 305,192 305,530 Commercial — — 55,486 17,002 72,488 Non-agency — — — 1,568 1,568 Corporate fixed income securities 182,025 542,480 486,937 — 1,211,442 Asset-backed securities — — 417,081 1,689,857 2,106,938 $ 184,021 $ 545,825 $ 978,587 $ 2,065,075 $ 3,773,508 Held-to-maturity: Mortgage-backed securities: Agency $ — $ — $ 143,715 $ 1,191,118 $ 1,334,833 Commercial — 58,971 — — 58,971 Asset-backed securities — — 403,840 1,860,443 2,264,283 Corporate fixed income securities 40,011 — — — 40,011 $ 40,011 $ 58,971 $ 547,555 $ 3,051,561 $ 3,698,098 (1) Due to the immaterial amount of income recognized on tax-exempt securities, yields were not calculated on a tax-equivalent basis.
Schedule Of Gross Unrealized Losses And The Estimated Fair Value By Length Of Time	The following table shows the gross unrealized losses and fair value of the Company’s investment securities with unrealized losses, aggregated by investment category and length of time the individual investment securities have been in continuous unrealized loss positions, at December 31, 2017 (in thousands) Less than 12 months 12 months or more Total Gross Unrealized Losses Estimated Fair Value Gross Unrealized Losses Estimated Fair Value Gross Unrealized Losses Estimated Fair Value Available-for-sale securities U.S. government securities $ (39 ) $ 4,983 — — $ (39 ) $ 4,983 State and municipal securities (59 ) 2,797 (4,073 ) 67,762 (4,132 ) 70,559 Mortgage-backed securities: Agency (1,024 ) 113,363 (1,957 ) 158,880 (2,981 ) 272,243 Commercial — — (3,088 ) 71,161 (3,088 ) 71,161 Corporate fixed income securities (2,513 ) 504,591 (3,139 ) 185,879 (5,652 ) 690,470 Asset-backed securities (4,897 ) 175,074 — — (4,897 ) 175,074 $ (8,532 ) $ 800,808 $ (12,257 ) $ 483,682 $ (20,789 ) $ 1,284,490 Held-to-maturity securities Mortgage-backed securities: Agency $ (743 ) $ 76,481 $ (15,465 ) $ 697,809 $ (16,208 ) $ 774,290 Asset-backed securities (29 ) 29,399 (1,833 ) 42,906 (1,862 ) 72,305 Corporate fixed income securities (37 ) 9,965 — — (37 ) 9,965 $ (809 ) $ 115,845 $ (17,298 ) $ 740,715 $ (18,107 ) $ 856,560

Bank Loans (Tables)

Bank Loans (Tables)	12 Months Ended
	Dec. 31, 2017
Receivables [Abstract]
Schedule Of Balance And Associated Percentage Of Each Major Loan Category In Bank Loan Portfolio	December 31, 2017 December 31, 2016 Balance Percent Balance Percent Residential real estate $ 2,593,576 37.0 % $ 2,161,400 38.4 % Commercial and industrial 2,437,938 34.8 1,710,399 30.3 Securities-based loans 1,819,206 25.9 1,614,033 28.6 Commercial real estate 116,258 1.7 78,711 1.4 Consumer 24,508 0.3 45,391 0.8 Home equity lines of credit 15,039 0.2 15,008 0.3 Construction and land 7,896 0.1 12,623 0.2 Gross bank loans 7,014,421 100.0 % 5,637,565 100.0 % Unamortized loan premium/(discount), net 788 858 Loans in process (856 ) (49 ) Unamortized loan fees, net 872 (2,021 ) Allowance for loan losses (67,466 ) (45,163 ) Bank loans, net $ 6,947,759 $ 5,591,190
Activity In The Allowance For Loan Losses By Portfolio Segment	Year Ended December 31, 2017 Beginning Balance Provision Charge- offs Recoveries Ending Balance Commercial and industrial $ 35,127 $ 19,666 $ (355 ) $ 36 $ 54,474 Securities-based loans 3,094 (1,006 ) — — 2,088 Residential real estate 2,660 5,770 — — 8,430 Commercial real estate 1,363 2,860 (2,703 ) — 1,520 Home equity lines of credit 371 (212 ) — 3 162 Construction and land 232 (132 ) — — 100 Consumer 129 (115 ) — 2 16 Qualitative 2,187 (1,511 ) — — 676 $ 45,163 $ 25,320 $ (3,058 ) $ 41 $ 67,466 Year Ended December 31, 2016 Beginning Balance Provision Charge- offs Recoveries Ending Balance Commercial and industrial $ 24,748 $ 10,646 $ (267 ) $ — $ 35,127 Securities-based loans 1,607 1,487 — — 3,094 Residential real estate 1,241 1,430 (13 ) 2 2,660 Commercial real estate 264 1,090 — 9 1,363 Home equity lines of credit 290 81 — — 371 Construction and land 78 154 — — 232 Consumer 105 38 (16 ) 2 129 Qualitative 1,454 733 — — 2,187 $ 29,787 $ 15,659 $ (296 ) $ 13 $ 45,163
Unpaid Principal Balances Of Loans And Amount Of Allowance Allocated Based Upon Impairment Method By Portfolio Segment	Allowance for Loan Losses Recorded Investment in Loans Individually Evaluated for Impairment Collectively Evaluated for Impairment Total Individually Evaluated for Impairment Collectively Evaluated for Impairment Total Residential real estate $ 24 $ 8,406 $ 8,430 $ 171 $ 2,593,405 $ 2,593,576 Commercial and industrial 9,059 45,415 54,474 28,856 2,409,082 2,437,938 Securities-based loans — 2,088 2,088 — 1,819,206 1,819,206 Commercial real estate — 1,520 1,520 — 116,258 116,258 Consumer 2 14 16 2 24,506 24,508 Home equity lines of credit 20 142 162 184 14,855 15,039 Construction and land — 100 100 — 7,896 7,896 Qualitative — 676 676 — — — $ 9,105 $ 58,361 $ 67,466 $ 29,213 $ 6,985,208 $ 7,014,421 Allowance for Loan Losses Recorded Investment in Loans Individually Evaluated for Impairment Collectively Evaluated for Impairment Total Individually Evaluated for Impairment Collectively Evaluated for Impairment Total Residential real estate $ 24 $ 2,636 $ 2,660 $ 178 $ 2,161,222 $ 2,161,400 Commercial and industrial 2,392 32,735 35,127 16,815 1,693,584 1,710,399 Securities-based loans — 3,094 3,094 — 1,614,033 1,614,033 Commercial real estate 722 641 1,363 9,522 69,189 78,711 Consumer 6 123 129 6 45,385 45,391 Home equity lines of credit 231 140 371 413 14,595 15,008 Construction and land — 232 232 — 12,623 12,623 Qualitative — 2,187 2,187 — — — $ 3,375 $ 41,788 $ 45,163 $ 26,934 $ 5,610,631 $ 5,637,565
Loans That Were Individually Evaluated For Impairment By Portfolio Segment	December 31, 2017 Unpaid Contractual Principal Balance Recorded Investment with No Allowance Recorded Investment with Allowance Total Recorded Investment Related Allowance Average Recorded Investment Commercial and industrial $ 28,856 $ 5,211 $ 23,645 $ 28,856 $ 9,059 $ 30,277 Consumer 677 — 2 2 2 5 Home equity lines of credit 184 — 184 184 20 300 Residential real estate 171 — 171 171 24 174 Total $ 29,888 $ 5,211 $ 24,002 $ 29,213 $ 9,105 $ 30,756 December 31, 2016 Unpaid Contractual Principal Balance Recorded Investment with No Allowance Recorded Investment with Allowance Total Recorded Investment Related Allowance Average Recorded Investment Commercial and industrial $ 16,815 $ — $ 16,815 $ 16,815 $ 2,392 $ 22,559 Commercial real estate 10,503 — 9,522 9,522 722 9,080 Consumer 833 — 6 6 6 9 Home equity lines of credit 413 — 413 413 231 413 Residential real estate 178 — 178 178 24 181 Total $ 28,742 $ — $ 26,934 $ 26,934 $ 3,375 $ 32,242
Aging Of The Recorded Investment In Past Due Loans	December 31, 2017 30-89 Days Past Due 90 or More Days Past Due Total Past Due Current Balance Total Residential real estate $ 7,892 $ — $ 7,892 $ 2,585,684 2,593,576 Commercial and industrial 11,883 — 11,883 2,426,055 2,437,938 Securities-based loans — — — 1,819,206 1,819,206 Commercial real estate — — — 116,258 116,258 Consumer 2 — 2 24,506 24,508 Home equity lines of credit 184 — 184 14,855 15,039 Construction and land — — — 7,896 7,896 Total $ 19,961 $ — $ 19,961 $ 6,994,460 $ 7,014,421 December 31, 2017 * Non-accrual Restructured Total Commercial and industrial $ 19,904 $ 8,952 $ 28,856 Home equity lines of credit 184 — 184 Residential real estate — 171 171 Consumer 2 — 2 Total $ 20,090 $ 9,123 $ 29,213 * There were no loans past due 90 days and still accruing interest at December 31, 2017. December 31, 2016 30 – 89 Days Past Due 90 or More Days Past Due Total Past Due Current Balance Total Residential real estate $ 1,923 $ — $ 1,923 $ 2,159,477 2,161,400 Commercial and industrial — — — 1,710,399 1,710,399 Securities-based loans — — — 1,614,033 1,614,033 Commercial real estate 9,522 — 9,522 69,189 78,711 Consumer — 2 2 45,389 45,391 Home equity lines of credit 78 196 274 14,734 15,008 Construction and land — — — 12,623 12,623 Total $ 11,523 $ 198 $ 11,721 $ 5,625,844 $ 5,637,565 December 31, 2016 * Non-accrual Restructured Total Commercial and industrial $ 16,815 $ — $ 16,815 Commercial real estate — 9,522 9,522 Home equity lines of credit 413 — 413 Residential real estate — 178 178 Consumer 6 — 6 Total $ 17,234 $ 9,700 $ 26,934 * There were no loans past due 90 days and still accruing interest at December 31, 2016.
Risk Category Of Loan Portfolio	December 31, 2017 Pass Special Mention Substandard Doubtful Total Residential real estate $ 2,593,096 $ 309 $ 171 $ — $ 2,593,576 Commercial and industrial 2,385,152 22,443 30,343 — 2,437,938 Securities-based loans 1,819,206 — — — 1,819,206 Commercial real estate 116,258 — — — 116,258 Consumer 24,506 — 2 — 24,508 Home equity lines of credit 14,855 — 184 — 15,039 Construction and land 7,896 — — — 7,896 Total $ 6,960,969 $ 22,752 $ 30,700 $ — $ 7,014,421 December 31, 2016 Pass Special Mention Substandard Doubtful Total Residential real estate $ 2,161,223 $ — $ 177 $ — 2,161,400 Commercial and industrial 1,652,211 27,905 30,283 — 1,710,399 Securities-based loans 1,614,033 — — — 1,614,033 Commercial real estate 69,189 — 9,522 — 78,711 Consumer 45,385 — 6 — 45,391 Home equity lines of credit 14,595 — 413 — 15,008 Construction and land 12,623 — — — 12,623 Total $ 5,569,259 $ 27,905 $ 40,401 $ — $ 5,637,565

Fixed Assets (Tables)

Fixed Assets (Tables)	12 Months Ended
	Dec. 31, 2017
Property Plant And Equipment [Abstract]
Summary Of Fixed Assets	The following is a summary of fixed assets as of December 31, 2017 and 2016 (in thousands) December 31, 2017 2016 Furniture and equipment $ 201,917 $ 254,705 Building and leasehold improvements 192,320 160,369 Property on operating leases — 21,064 394,237 436,138 Less accumulated depreciation and amortization (239,117 ) (263,310 ) $ 155,120 $ 172,828

Goodwill And Intangible Assets

Goodwill And Intangible Assets (Tables)	12 Months Ended
	Dec. 31, 2017
Goodwill And Intangible Assets Disclosure [Abstract]
Carrying Amount Of Goodwill And Intangible Assets	The carrying amount of goodwill and intangible assets attributable to each of our reporting segments is presented in the following table (in thousands) December 31, 2016 Net Additions Write-off December 31, 2017 Goodwill Global Wealth Management $ 270,779 $ 5,698 $ — $ 276,477 Institutional Group 691,503 854 — 692,357 $ 962,282 $ 6,552 $ — $ 968,834 December 31, 2016 Net Additions Amortization December 31, 2017 Intangible assets Global Wealth Management $ 45,231 $ 3,800 $ (4,506 ) $ 44,525 Institutional Group 71,073 1,658 (7,629 ) 65,102 $ 116,304 $ 5,458 $ (12,135 ) $ 109,627
Intangible Assets Subject To Amortization	Intangible assets subject to amortization as of December 31, 2017 and 2016 were as follows (in thousands) December 31, 2017 December 31, 2016 Gross Carrying Value Accumulated Amortization Gross Carrying Value Accumulated Amortization Customer relationships $ 146,986 $ 55,809 $ 141,621 $ 46,209 Trade name 24,713 10,228 24,713 8,670 Investment banking backlog 2,598 1,202 1,345 379 Non-compete agreements 1,419 968 2,578 813 $ 175,716 $ 68,207 $ 170,257 $ 56,071
Amortization Expense In Future Periods	As of December 31, 2017, we expect amortization expense in future periods to be as follows (in thousands) Fiscal year 2018 $ 10,890 2019 10,341 2020 10,124 2021 9,622 2022 8,880 Thereafter 57,652 $ 107,509

Senior Notes (Tables)

Senior Notes (Tables)	12 Months Ended
	Dec. 31, 2017
Debt Disclosure [Abstract]
Summary of Senior Notes	The following table summarizes our senior notes as of December 31, 2017 and 2016 (in thousands) December 31, 2017 2016 4.250% senior notes, due 2024 (1) $ 500,000 $ 500,000 3.50% senior notes, due 2020 (2) 300,000 300,000 5.20% senior notes, due 2047 (3) 225,000 — 1,025,000 800,000 Debt issuance costs, net (10,060 ) (4,109 ) $ 1,014,940 $ 795,891 ( 1) In July 2014, we sold in a registered underwritten public offering, $300.0 million in aggregate principal amount of 4.250% senior notes due July 2024. Interest on these senior notes is payable semi-annually in arrears. We may redeem the notes in whole or in part, at our option, at a redemption price equal to 100% of their principal amount, plus a “make-whole” premium and accrued and unpaid interest, if any, to the date of redemption. In July 2016, we issued an additional $200.0 million in aggregate principal amount of 4.25% senior notes due 2024. (2) In December 2015, we sold in a registered underwritten public offering, $300.0 million in aggregate principal amount of 3.50% senior notes due December 2020. Interest on these senior notes is payable semi-annually in arrears. We may redeem the notes in whole or in part, at our option, at a redemption price equal to 100% of their principal amount, plus a “make-whole” premium and accrued and unpaid interest, if any, to the date of redemption. (3)
Schedule of Corporate Date Maturity	Our senior notes mature as follows, based upon contractual terms (in thousands) 2018 $ — 2019 — 2020 300,000 2021 — 2022 — Thereafter 725,000 $ 1,025,000

Bank Deposits (Tables)

Bank Deposits (Tables)	12 Months Ended
	Dec. 31, 2017
Deposits Liabilities Balance Sheet Reported Amounts [Abstract]
Schedule Of Deposits	Deposits consist of money market and savings accounts, certificates of deposit, and demand deposits. Deposits at December 31, 2017 and 2016 were as follows (in thousands) December 31, 2017 2016 Money market and savings accounts $ 13,219,675 $ 11,264,285 Demand deposits (interest-bearing) 184,829 253,545 Demand deposits (non-interest-bearing) 5,856 5,752 Certificates of deposit 1,575 3,901 $ 13,411,935 $ 11,527,483

Derivative Instruments And He50

Derivative Instruments And Hedging Activities (Tables)	12 Months Ended
	Dec. 31, 2017
General Discussion Of Derivative Instruments And Hedging Activities [Abstract]
Schedule Of Notional Values And Fair Values Of Derivative Instruments	The following table provides the notional values and fair values of our derivative instruments as of December 31, 2017 and 2016 (in thousands) December 31, 2017 Asset Derivatives Notional Value Balance Sheet Location Fair Value Derivatives designated as hedging instruments under Topic 815: Cash flow interest rate contracts $ 540,000 Other assets $ 7,995 December 31, 2016 Asset Derivatives Notional Value Balance Sheet Location Fair Value Derivatives designated as hedging instruments under Topic 815: Cash flow interest rate contracts $ 790,000 Other assets $ 10,390 December 31, 2016 Liability Derivatives Notional Value Balance Sheet Location Fair Value Cash flow interest rate contracts $ 121,442 Accounts payable and accrued expenses $ 1,823
Schedule Of Derivative Instruments In Consolidated Statements Of Operations	The following table shows the effect of our company’s derivative instruments in the consolidated statements of operations for the years ended December 31, 2017, 2016, and 2015 (in thousands) Year Ended December 31, 2017 Gain/(Loss) Recognized in OCI (Effectiveness) Location of Loss Reclassified From OCI Into Income Loss Reclassified From OCI Into Income Location of Loss Recognized in OCI (Ineffectiveness) Loss Recognized Due to Ineffectiveness Cash flow interest rate contracts $ 1,085 Interest Expense $ 635 Interest Expense $ — Year Ended December 31, 2016 Gain/(Loss) Recognized in OCI (Effectiveness) Location of Loss Reclassified From OCI Into Income Loss Reclassified From OCI Into Income Location of Loss Recognized in OCI (Ineffectiveness) Loss Recognized Due to Ineffectiveness Cash flow interest rate contracts $ 6,383 Interest expense $ 5,444 Interest expense $ 30 Year Ended December 31, 2015 Gain/(Loss) Recognized in OCI (Effectiveness) Location of Loss Reclassified From OCI Into Income Loss Reclassified From OCI Into Income Location of Loss Recognized in OCI (Ineffectiveness) Loss Recognized Due to Ineffectiveness Cash flow interest rate contracts $ (2,137 ) Interest expense $ 3,824 Interest expense $ —

Debentures To Stifel Financia51

Debentures To Stifel Financial Capital Trusts (Tables)	12 Months Ended
	Dec. 31, 2017
Junior Subordinated Debenture Owed To Unconsolidated Subsidiary Trust [Abstract]
Debentures To Stifel Financial Capital Trusts	The following table summarizes our debentures to Stifel Financial Capital Trusts as of December 31, 2017 and 2016 (in thousands) December 31, 2017 2016 Debenture to Stifel Financial Capital Trust II (1) $ 20,000 $ 20,000 Debenture to Stifel Financial Capital Trust III (2) 35,000 35,000 Debenture to Stifel Financial Capital Trust IV (3) 12,500 12,500 $ 67,500 $ 67,500 (1) On August 12, 2005, we completed a private placement of $35.0 million of 6.38% Cumulative Trust Preferred Securities. The trust preferred securities were offered by Stifel Financial Capital Trust II (the “Trust II”), a non-consolidated wholly owned subsidiary of our company. The trust preferred securities mature on September 30, 2035, but may be redeemed by our company, and in turn, the Trust II would call the debenture beginning September 30, 2010. The Trust II requires quarterly distributions of interest to the holders of the trust preferred securities. Distributions are payable at a floating interest rate equal to three-month LIBOR plus 1.70% per annum. During 2016, we extinguished $15.0 million of the Trust II debentures. (2) On March 30, 2007, we completed a private placement of $35.0 million of 6.79% Cumulative Trust Preferred Securities. The trust preferred securities were offered by Stifel Financial Capital Trust III (the “Trust III”), a non-consolidated wholly owned subsidiary of our company. The trust preferred securities mature on June 6, 2037, but may be redeemed by our company, and in turn, Trust III would call the debenture beginning June 6, 2012. Trust III requires quarterly distributions of interest to the holders of the trust preferred securities. Distributions are payable at a floating interest rate equal to three-month LIBOR plus 1.85% per annum. (3) On June 28, 2007, we completed a private placement of $35.0 million of 6.78% Cumulative Trust Preferred Securities. The trust preferred securities were offered by Stifel Financial Capital Trust IV (the “Trust IV”), a non-consolidated wholly owned subsidiary of our company. The trust preferred securities mature on September 6, 2037, but may be redeemed by our company, and in turn, Trust IV would call the debenture beginning September 6, 2012. Trust IV requires quarterly distributions of interest to the holders of the trust preferred securities. Distributions are payable at a floating interest rate equal to three-month LIBOR plus 1.85% per annum.

Disclosures About Offsetting 52

Disclosures About Offsetting Assets And Liabilities (Tables)	12 Months Ended
	Dec. 31, 2017
Offsetting [Abstract]
Financial Assets And Derivative Assets That Are Subject to Offset	The following table provides information about financial assets and derivative assets that are subject to offset as of December 31, 2017 and 2016 (in thousands) Gross amounts not offset in the Statement of Financial Condition Gross Amounts of Recognized Assets Gross Amounts Offset in the of Financial Condition Net Amounts Presented in the Statement of Financial Condition Amounts available for offset Available collateral Net Amount As of December 31, 2017: Securities borrowing (1) $ 132,776 $ — $ 132,776 $ (78,474 ) $ (37,248 ) $ 17,054 Reverse repurchase agreements (2) 512,220 — 512,220 (233,624 ) (266,008 ) 12,588 Cash flow interest rate contracts 7,995 — 7,995 — — 7,995 $ 652,991 $ — $ 652,991 $ (312,098 ) $ (303,256 ) $ 37,637 As of December 31, 2016: Securities borrowing (1) $ 382,691 $ — $ 382,691 $ (291,793 ) $ (68,776 ) $ 22,122 Reverse repurchase agreements (2) 248,588 — 248,588 (216,542 ) (32,046 ) — Cash flow interest rate contracts 10,390 — 10,390 — — 10,390 $ 641,669 $ — $ 641,669 $ (508,335 ) $ (100,822 ) $ 32,512 (1) Securities borrowing transactions are included in receivables from brokers, dealers, and clearing organizations on the consolidated statements of financial condition. See Note 4 in the notes to consolidated financial statements for additional information on receivables from brokers, dealers, and clearing organizations. (2) Collateral received includes securities received by our company from the counterparty. These securities are not included on the consolidated statements of financial condition unless there is an event of default. The fair value of securities pledged as collateral was $509.4 million and $248.5 million at December 31, 2017 and 2016, respectively.
Financial Liabilities And Derivative Liabilities That Are Subject To Offset	The following table provides information about financial liabilities and derivative liabilities that are subject to offset as of December 31, 2017 and 2016 (in thousands) Gross amounts not offset in the Statement of Financial Condition Gross Amounts of Recognized Liabilities Gross Amounts Offset in the Statement of Financial Condition Net Amounts Presented in the Statement of Financial Condition Amounts available for offset Collateral Pledged Net Amount As of December 31, 2017: Securities lending (3) $ (219,782 ) $ — $ (219,782 ) $ 78,474 $ 133,772 $ (7,536 ) Repurchase agreements (4) (233,704 ) — (233,704 ) 233,624 80 — $ (453,486 ) $ — $ (453,486 ) $ 312,098 $ 133,852 $ (7,536 ) As of December 31, 2016: Securities lending (3) $ (478,814 ) $ — $ (478,814 ) $ 291,793 $ 175,849 $ (11,172 ) Repurchase agreements (4) (268,546 ) — (268,546 ) 216,542 52,004 — Cash flow interest rate contracts (1,823 ) — (1,823 ) — 1,823 — $ (749,183 ) $ — $ (749,183 ) $ 508,335 $ 229,676 $ (11,172 ) (3) Securities lending transactions are included in payables to brokers, dealers, and clearing organizations on the consolidated statements of financial condition. See Note 4 in the notes to consolidated financial statements for additional information on payables to brokers, dealers, and clearing organizations. (4) Collateral pledged includes the fair value of securities pledged by our company to the counter party. These securities are included on the consolidated statements of financial condition unless we default. Collateral pledged by our company to the counter party includes U.S. government agency securities, U.S. government securities, and corporate fixed income securities with market values of $241.4 million and $299.3 million at December 31, 2017 and 2016, respectively.

Commitments, Guarantees And Con

Commitments, Guarantees And Contingencies (Tables)	12 Months Ended
	Dec. 31, 2017
Commitments And Contingencies Disclosure [Abstract]
Future Minimum Commitments Under Non-Cancelable Operating Leases	Future minimum commitments under non-cancelable operating leases at December 31, 2017, are as follows (in thousands) 2018 $ 96,009 2019 90,763 2020 77,186 2021 60,279 2022 52,732 Thereafter 151,548 $ 528,517

Regulatory Capital Requiremen54

Regulatory Capital Requirements (Tables)	12 Months Ended
	Dec. 31, 2017
Regulatory Capital Requirements [Abstract]
Schedule Of Total Risk-Based, Tier 1 Risk-Based, And Tier 1 Leverage Ratios	Stifel Financial Corp. – Federal Reserve Capital Amounts December 31, 2017 Actual For Capital Adequacy Purposes To Be Well Capitalized Under Prompt Corrective Action Provisions Amount Ratio Amount Ratio Amount Ratio Common equity tier 1 capital $ 1,689,291 16.9 % $ 450,758 4.5 % $ 651,095 6.5 % Tier 1 capital 1,899,162 19.0 601,011 6.0 801,347 8.0 Total capital 1,966,634 19.6 801,347 8.0 1,001,684 10.0 Tier 1 leverage 1,899,162 9.5 795,679 4.0 994,599 5.0 Stifel Bank – Federal Reserve Capital Amounts December 31, 2017 Actual For Capital Adequacy Purposes To Be Well Capitalized Under Prompt Corrective Action Provisions Amount Ratio Amount Ratio Amount Ratio Common equity tier 1 capital $ 1,056,211 14.3 % $ 331,447 4.5 % $ 478,757 6.5 % Tier 1 capital 1,056,211 14.3 441,930 6.0 589,240 8.0 Total capital 1,124,452 15.3 589,240 8.0 736,550 10.0 Tier 1 leverage 1,056,211 7.1 595,872 4.0 744,840 5.0

Interest Income And Interest 55

Interest Income And Interest Expense (Tables)	12 Months Ended
	Dec. 31, 2017
Banking And Thrift Interest [Abstract]
Components Of Interest Income And Interest Expense	The components of interest income and interest expense are as follows (in thousands) Year Ended December 31, 2017 2016 2015 Interest income: Bank loans, net of unearned income $ 206,084 $ 131,808 $ 79,816 Investment securities 189,472 108,992 53,787 Margin balances 37,218 32,147 22,421 Inventory 17,563 18,965 17,757 Other 4,044 2,420 5,320 $ 454,381 $ 294,332 $ 179,101 Interest expense: Senior notes $ 35,338 $ 36,217 $ 25,695 Bank deposits 12,661 7,331 7,262 Federal Home Loan Bank advances 8,305 6,777 551 Other 13,726 16,549 11,891 $ 70,030 $ 66,874 $ 45,399

Employee Incentive, Deferred 56

Employee Incentive, Deferred Compensation, And Retirement Plans (Tables)	12 Months Ended
	Dec. 31, 2017
Share Based Compensation Allocation And Classification In Financial Statements [Abstract]
Unvested Stock Award Activity	Units/Awards Weighted-average grant date fair value Unvested December 31, 2016 16,276 $ 39.40 Granted 1,422 51.24 Vested (1,875 ) 33.59 Converted to restricted stock (3,111 ) 39.49 Cancelled (433 ) 33.93 Unvested December 31, 2017 12,279 $ 42.17

Income Taxes (Tables)

Income Taxes (Tables)	12 Months Ended
	Dec. 31, 2017
Components Of Income Tax Expense Benefit Continuing Operations [Abstract]
Provision For Income Taxes/(Benefit)	The provision for income taxes consists of the following (in thousands) Year Ended December 31, 2017 2016 2015 Current taxes: Federal $ (29,396 ) $ 7,927 $ 43,962 State (334 ) 5,818 9,672 Foreign (1,734 ) 1,255 1,329 (31,464 ) 15,000 54,963 Deferred taxes: Federal 114,842 39,127 (9,396 ) State 1,728 6,261 3,056 Foreign 1,559 674 608 118,129 46,062 (5,732 ) Provision for income taxes $ 86,665 $ 61,062 $ 49,231
Reconciliation Of The Statutory Federal Income Tax With The Company's Effective Tax Rate	Reconciliation of the statutory federal income tax rate with our company’s effective income tax rate is as follows (in thousands) Year Ended December 31, 2017 2016 2015 Statutory rate $ 94,338 $ 49,904 $ 49,548 State income taxes, net of federal income tax 6,721 7,688 7,908 Investment in subsidiary — — (4,800 ) Change in uncertain tax position 1,544 41 (3,903 ) Non-deductible litigation expense — 7,700 — Foreign tax rate difference (412 ) (1,810 ) (106 ) Excess tax benefit from stock-based compensation (57,431 ) — — Revaluation of deferred tax assets 42,443 — — Other, net (538 ) (2,461 ) 584 $ 86,665 $ 61,062 $ 49,231
Deferred Tax Assets And Liabilities	Tax effect of temporary differences and carryforwards that comprise significant portions of deferred tax assets and liabilities (in thousands) December 31, 2017 2016 Deferred tax assets: Deferred compensation $ 71,687 $ 181,575 Accrued expenses 33,957 35,443 Net operating loss carryforwards 31,986 40,266 Receivable reserves 22,679 22,870 Depreciation 4,012 12,550 Total deferred tax assets 164,321 292,704 Valuation allowance (4,285 ) (8,768 ) 160,036 283,936 Deferred tax liabilities: Goodwill and other intangibles (38,982 ) (49,481 ) Unrealized gain on investments (11,081 ) (1,459 ) Prepaid expenses (2,834 ) (4,557 ) Other (1,987 ) (2,986 ) (54,884 ) (58,483 ) Net deferred tax asset $ 105,152 $ 225,453
Unrecognized Tax Benefits	The following table summarizes the activity related to our company’s unrecognized tax benefits from January 1, 2015 to December 31, 2017 (in thousands) Year Ended December 31, 2017 2016 2015 Beginning balance $ 1,800 $ 2,717 $ 5,510 Increase related to prior year tax positions 3,036 5 1,206 Decrease related to prior year tax positions (287 ) (31 ) (33 ) Increase related to current year tax positions — — — Decrease related to settlements with taxing authorities (171 ) (42 ) (4,815 ) Decrease related to lapsing of statute of limitations (1,198 ) — — Increase/(decrease) related to business acquisitions — (849 ) 849 Ending balance $ 3,180 $ 1,800 $ 2,717

Segment Reporting (Tables)

Segment Reporting (Tables)	12 Months Ended
	Dec. 31, 2017
Segment Reporting [Abstract]
Schedule Of Operating Information, Segment	Information concerning operations in these segments of business for the years ended December 31, 2017, 2016, and 2015, is as follows (in thousands) Year Ended December 31, 2017 2016 2015 Net revenues: (1) Global Wealth Management $ 1,822,218 $ 1,563,410 $ 1,377,313 Institutional Group 1,110,768 1,014,164 975,594 Other (6,554 ) (2,078 ) (21,313 ) $ 2,926,432 $ 2,575,496 $ 2,331,594 Income/(loss) before income taxes: Global Wealth Management $ 626,906 $ 430,318 $ 382,126 Institutional Group 217,981 164,143 141,042 Other (575,351 ) (451,879 ) (381,601 ) $ 269,536 $ 142,582 $ 141,567 (1) No individual client accounted for more than 10 percent of total net revenues for the years ended December 31, 2017, 2016, and 2015.
Schedule Of Information Of Total Assets On Segment Basis	The following table presents our company’s total assets on a segment basis at December 31, 2017 and 2016 (in thousands) December 31, 2017 2016 Global Wealth Management $ 17,717,617 $ 16,065,503 Institutional Group 3,313,304 2,657,183 Other 353,032 406,670 $ 21,383,953 $ 19,129,356
Schedule Of Net Revenues Earned On Major Geographical Areas	Revenues, classified by the major geographic areas in which they were earned for the years ended December 31, 2017, 2016, and 2015, were as follows (in thousands): Year Ended December 31, 2017 2016 2015 United States $ 2,783,175 $ 2,429,714 $ 2,195,538 United Kingdom 129,288 132,622 125,552 Other 13,969 13,160 10,504 $ 2,926,432 $ 2,575,496 $ 2,331,594

Earnings Per Share (Tables)

Earnings Per Share (Tables)	12 Months Ended
	Dec. 31, 2017
Earnings Per Share [Abstract]
Computation Of Basic And Diluted Earnings Per Share	The following table sets forth the computation of basic and diluted earnings per share for the years ended December 31, 2017, 2016, and 2015 (in thousands, except per share data) Year Ended December 31, 2017 2016 2015 Net income $ 182,871 $ 81,520 $ 92,336 Preferred dividends 9,375 3,906 — Net income available to common shareholders $ 173,496 $ 77,614 $ 92,336 Shares for basic and diluted calculation: Average shares used in basic computation 68,562 66,871 68,543 Dilutive effect of stock options and units (1) 12,473 10,692 10,011 Average shares used in diluted computation 81,035 77,563 78,554 Earnings per common share: Basic $ 2.53 $ 1.16 $ 1.35 Diluted $ 2.14 $ 1.00 $ 1.18 (1) Diluted earnings per share is computed on the basis of the weighted-average number of shares of common stock plus the effect of dilutive potential common shares outstanding during the period using the treasury stock method. Diluted earnings per share include stock options and units.

Quarterly Financial Informati60

Quarterly Financial Information (Tables)	12 Months Ended
	Dec. 31, 2017
Quarterly Financial Information Disclosure [Abstract]
Quarterly Financial Information	Year Ended December 31, 2017 (in thousands, except per share amounts) 1 st 2 nd 3 rd 4 th Operating revenues $ 590,474 $ 633,340 $ 620,932 $ 697,335 Interest income 100,953 108,951 117,862 126,615 Total revenues 691,427 742,291 738,794 823,950 Interest expense 15,896 16,644 17,625 19,865 Net revenues 675,531 725,647 721,169 804,085 Total non-interest expenses 596,512 642,449 613,030 804,905 Income before income tax expense 79,019 83,198 108,139 (820 ) Provision for income taxes 13,507 30,387 41,603 1,168 Net income 65,512 52,811 66,536 (1,988 ) Preferred dividends 2,344 2,344 2,343 2,344 Net income available to common shareholders $ 63,168 $ 50,467 $ 64,193 $ (4,332 ) Earnings per common share (1) Basic $ 0.92 $ 0.74 $ 0.94 $ (0.06 ) Diluted $ 0.78 $ 0.63 $ 0.79 $ (0.06 ) Weighted-average number of common shares outstanding: Basic 68,386 68,556 68,522 68,782 Diluted 80,695 80,021 80,881 68,782 Cash dividends declared per common share $ — $ — $ 0.10 $ 0.10 Year Ended December 31, 2016 (in thousands, except per share amounts) 1 st 2 nd 3 rd 4 th Operating revenues $ 571,299 $ 603,627 $ 586,488 $ 586,665 Interest income 62,786 65,780 74,881 90,844 Total revenues 634,085 669,407 661,369 677,509 Interest expense 14,111 17,262 19,383 16,118 Net revenues 619,974 652,145 641,986 661,391 Total non-interest expenses 576,061 636,352 614,004 606,497 Income before income tax expense 43,913 15,793 27,982 54,894 Provision for income taxes 16,858 6,022 10,168 28,014 Net income 27,055 9,771 17,814 26,880 Preferred dividends — — 1,563 2,343 Net income available to common shareholders $ 27,055 $ 9,771 $ 16,251 $ 24,537 Earnings per common share Basic $ 0.40 $ 0.15 $ 0.24 $ 0.37 Diluted $ 0.36 $ 0.13 $ 0.21 $ 0.31 Weighted-average number of common shares outstanding: Basic 67,579 66,792 66,482 66,636 Diluted 76,086 75,982 77,544 79,539 Cash dividends declared per common share $ — $ — $ — $ —

Summary Of Significant Accoun61

Summary Of Significant Accounting Policies (Details) - USD ($)	Oct. 31, 2017	Jul. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
New Accounting Pronouncements Or Change In Accounting Principle [Line Items]
Loan impairment threshold period				90 days
Threshold of reporting unit goodwill carrying value for further analysis				$ 0
Goodwill impairment charges	$ 0	$ 0
Corporate tax rate				35.00%
Shares withheld from employee awards for tax withholding purposes				$ 214,744,000	$ 61,601,000	$ 65,021,000
Reclassification from Operating Activities to Financing Activities [Member] | ASU No. 2016-09 [Member]
New Accounting Pronouncements Or Change In Accounting Principle [Line Items]
Shares withheld from employee awards for tax withholding purposes					$ 61,600,000	$ 65,000,000
Scenario Forecast [Member]
New Accounting Pronouncements Or Change In Accounting Principle [Line Items]
Corporate tax rate			21.00%
Office Equipment [Member] | Minimum [Member]
New Accounting Pronouncements Or Change In Accounting Principle [Line Items]
Fixed assets, Useful life				2 years
Office Equipment [Member] | Maximum [Member]
New Accounting Pronouncements Or Change In Accounting Principle [Line Items]
Fixed assets, Useful life				7 years
Building and Building Improvements [Member] | Minimum [Member]
New Accounting Pronouncements Or Change In Accounting Principle [Line Items]
Fixed assets, Useful life				3 years
Building and Building Improvements [Member] | Maximum [Member]
New Accounting Pronouncements Or Change In Accounting Principle [Line Items]
Fixed assets, Useful life				39 years

Acquisitions (Narrative) (Detai

Acquisitions (Narrative) (Details) - USD ($) $ in Thousands	Jan. 03, 2017	May 03, 2016	Jan. 04, 2016	Jun. 05, 2015	Dec. 31, 2017	Dec. 31, 2016	Dec. 04, 2015
Business Acquisition [Line Items]
Goodwill					$ 968,834	$ 962,282
Restricted stock units, charges at the date of modification					55,900
Restricted Stock Units (RSUs) [Member]
Business Acquisition [Line Items]
Restricted stock units, charges at the date of modification						58,600
City Securities Corporation [Member]
Business Acquisition [Line Items]
Goodwill	$ 7,100
Identifiable intangible assets	$ 4,100
Period of contingent consideration	2 years
Liability for earn-out payments					500
ISM Capital LLP [Member]
Business Acquisition [Line Items]
Goodwill		$ 6,300
Identifiable intangible assets		$ 2,300
Period of contingent consideration		3 years
Liability for earn-out payments					1,900	3,700
Eaton Partners [Member]
Business Acquisition [Line Items]
Goodwill			$ 72,000
Identifiable intangible assets			$ 32,300
Period of contingent consideration			4 years
Liability for earn-out payments					$ 31,200	$ 27,300
Barclays Wealth and Investment Management, Americas [Member]
Business Acquisition [Line Items]
Goodwill							$ 24,800
Deferred consideration, recognized as a liability							15,200
Barclays Wealth and Investment Management, Americas [Member] | Customer Relationships [Member]
Business Acquisition [Line Items]
Identifiable intangible assets							7,300
Barclays Wealth and Investment Management, Americas [Member] | Stifel Bank [Member]
Business Acquisition [Line Items]
Loans acquired in acquisition							$ 600,000
Sterne Agee Group, Inc. [Member]
Business Acquisition [Line Items]
Goodwill and intangible assets				$ 60,800
Fair value of awards issued as retention				23,800
Employee retention compensation paid in notes				$ 33,800
Sterne Agee Group, Inc. [Member] | Minimum [Member]
Business Acquisition [Line Items]
Individual compensation and benefits useful period				5 years
Sterne Agee Group, Inc. [Member] | Maximum [Member]
Business Acquisition [Line Items]
Individual compensation and benefits useful period				10 years
Sterne Agee Group, Inc. [Member] | Customer Relationships [Member]
Business Acquisition [Line Items]
Identifiable intangible assets				$ 29,300

Receivables From And Payables63

Receivables From And Payables To Brokers, Dealers And Clearing Organizations (Amounts Receivable From Brokers, Dealers, And Clearing Organizations) (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Due To And From Broker Dealers And Clearing Organizations [Abstract]
Receivables from clearing organizations	$ 270,285	$ 568,373
Deposits paid for securities borrowed	132,776	382,691
Securities failed to deliver	56,046	73,688
Receivables from brokers, dealers and clearing organizations, Total	$ 459,107	$ 1,024,752

Receivables From And Payables64

Receivables From And Payables To Brokers, Dealers And Clearing Organizations (Amounts Payable To Brokers, Dealers, And Clearing Organizations) (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Due To And From Broker Dealers And Clearing Organizations [Abstract]
Deposits received from securities loaned	$ 219,782	$ 478,814
Securities failed to receive	29,297	27,882
Payable to clearing organizations	27,223	16,411
Payables to broker, dealers and clearing organizations, Total	$ 276,302	$ 523,107

Fair Value Of Financial Instrum

Fair Value Of Financial Instruments (Schedule Of Fair Value Of Investments In And Unfunded Commitments To Funds Measured At Net Asset Value) (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Fair Value Investments Entities That Calculate Net Asset Value Per Share [Line Items]
Fair value of investments	$ 101,990	$ 90,809
Unfunded commitments	3,155	12,368
Private Company Investments [Member]
Fair Value Investments Entities That Calculate Net Asset Value Per Share [Line Items]
Fair value of investments		18,763
Unfunded commitments		8,526
Partnership Interests [Member]
Fair Value Investments Entities That Calculate Net Asset Value Per Share [Line Items]
Fair value of investments	5,124	15,798
Unfunded commitments	1,330	1,822
Mutual Funds [Member]
Fair Value Investments Entities That Calculate Net Asset Value Per Share [Line Items]
Fair value of investments	11,748	11,301
Private Equity Funds [Member]
Fair Value Investments Entities That Calculate Net Asset Value Per Share [Line Items]
Fair value of investments	7,677	9,310
Unfunded commitments	1,825	2,020
Money Market Funds [Member]
Fair Value Investments Entities That Calculate Net Asset Value Per Share [Line Items]
Fair value of investments	$ 77,441	$ 35,637

Fair Value Of Financial Instr66

Fair Value Of Financial Instruments (Fair Value Of Assets And Liabilities Measured On Recurring Basis) (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Financial instruments owned	$ 1,143,684	$ 925,045
Available-for-sale securities	3,773,508	3,181,313
Investments	111,379	133,563
Cash equivalents measured at NAV	77,441	35,637
Derivative contracts, Assets	7,995	10,390
Total Assets	5,114,007	4,285,948
Financial instruments sold, but not yet purchased, at fair value	778,863	699,032
Derivative contracts, Liabilities		1,823
Total Liabilities		700,855
Sovereign Debt [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Financial instruments owned	32,470	30,385
Financial instruments sold, but not yet purchased, at fair value	20,236	27,667
U.S. Government Agency Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Financial instruments owned	147,223	89,833
Available-for-sale securities	4,983	4,197
Financial instruments sold, but not yet purchased, at fair value	10,348	20,549
Corporate Fixed Income Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Financial instruments owned	329,179	269,561
Available-for-sale securities	1,211,442	823,511
Financial instruments sold, but not yet purchased, at fair value	180,755	175,301
Corporate Equity Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Financial instruments owned	46,802	32,044
Investments	49,978	27,247
Financial instruments sold, but not yet purchased, at fair value	38,510	18,395
State And Municipal Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Financial instruments owned	169,699	159,095
Available-for-sale securities	70,559	72,490
Financial instruments sold, but not yet purchased, at fair value		31
Asset-Backed Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities	2,106,938	1,867,718
Investments In Funds Measured At NAV [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments	24,549	55,172
Auction Rate Equity Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments	34,789	48,689
Auction Rate Municipal Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments	846	832
Other Investment [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments	1,217	1,623
U.S. Government Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Financial instruments owned	13,466	9,951
Financial instruments sold, but not yet purchased, at fair value	442,402	362,536
Mortgage Backed Securities [Member] | Agency [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Financial instruments owned	329,691	305,774
Available-for-sale securities	305,530	338,732
Financial instruments sold, but not yet purchased, at fair value	86,612	94,552
Mortgage Backed Securities [Member] | Non-Agency [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Financial instruments owned	75,154	28,402
Available-for-sale securities	1,568	1,892
Financial instruments sold, but not yet purchased, at fair value		1
Mortgage Backed Securities [Member] | Commercial [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities	72,488	72,773
Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Financial instruments owned	60,239	43,339
Available-for-sale securities	516	300
Investments	49,978	23,414
Total Assets	110,733	67,053
Financial instruments sold, but not yet purchased, at fair value	480,472	381,911
Total Liabilities		381,911
Level 1 [Member] | U.S. Government Agency Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities	516	300
Level 1 [Member] | Corporate Fixed Income Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Financial instruments owned	362	1,944
Financial instruments sold, but not yet purchased, at fair value		980
Level 1 [Member] | Corporate Equity Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Financial instruments owned	46,411	31,444
Investments	49,978	23,414
Financial instruments sold, but not yet purchased, at fair value	38,070	18,395
Level 1 [Member] | U.S. Government Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Financial instruments owned	13,466	9,951
Financial instruments sold, but not yet purchased, at fair value	442,402	362,536
Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Financial instruments owned	1,082,592	879,751
Available-for-sale securities	3,772,992	3,181,013
Investments	360	383
Derivative contracts, Assets	7,995	10,390
Total Assets	4,863,939	4,071,537
Financial instruments sold, but not yet purchased, at fair value	298,391	317,121
Derivative contracts, Liabilities		1,823
Total Liabilities		318,944
Level 2 [Member] | Sovereign Debt [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Financial instruments owned	32,470	30,385
Financial instruments sold, but not yet purchased, at fair value	20,236	27,667
Level 2 [Member] | U.S. Government Agency Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Financial instruments owned	147,223	89,833
Available-for-sale securities	4,467	3,897
Financial instruments sold, but not yet purchased, at fair value	10,348	20,549
Level 2 [Member] | Corporate Fixed Income Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Financial instruments owned	328,575	267,344
Available-for-sale securities	1,211,442	823,511
Financial instruments sold, but not yet purchased, at fair value	180,755	174,321
Level 2 [Member] | Corporate Equity Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Financial instruments owned	138
Financial instruments sold, but not yet purchased, at fair value	440
Level 2 [Member] | State And Municipal Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Financial instruments owned	169,699	159,095
Available-for-sale securities	70,559	72,490
Financial instruments sold, but not yet purchased, at fair value		31
Level 2 [Member] | Asset-Backed Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities	2,106,938	1,867,718
Level 2 [Member] | Other Investment [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments	360	383
Level 2 [Member] | Mortgage Backed Securities [Member] | Agency [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Financial instruments owned	329,691	305,774
Available-for-sale securities	305,530	338,732
Financial instruments sold, but not yet purchased, at fair value	86,612	94,552
Level 2 [Member] | Mortgage Backed Securities [Member] | Non-Agency [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Financial instruments owned	74,796	27,320
Available-for-sale securities	1,568	1,892
Financial instruments sold, but not yet purchased, at fair value		1
Level 2 [Member] | Mortgage Backed Securities [Member] | Commercial [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities	72,488	72,773
Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Financial instruments owned	853	1,955
Investments	36,492	54,594
Total Assets	37,345	56,549
Level 3 [Member] | Corporate Fixed Income Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Financial instruments owned	242	273
Level 3 [Member] | Corporate Equity Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Financial instruments owned	253	600
Investments		3,833
Level 3 [Member] | Auction Rate Equity Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments	34,789	48,689
Level 3 [Member] | Auction Rate Municipal Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments	846	832
Level 3 [Member] | Other Investment [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments	857	1,240
Level 3 [Member] | Mortgage Backed Securities [Member] | Non-Agency [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Financial instruments owned	$ 358	$ 1,082

Fair Value Of Financial Instr67

Fair Value Of Financial Instruments (Schedule Of Changes In Fair Value Associated With Level 3 Financial Instruments) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Transfers, Into Level 3	$ 0
Transfers, Out of Level 3	(18,300)
Non-Agency [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Beginning Balance	1,082	$ 1,476
Unrealized gains/(losses), Included in changes in net assets	(260)	(18)
Realized gains/(losses)	90	54
Sales	(324)
Redemptions	(230)	(430)
Net change	(724)	(394)
Ending Balance	358	1,082
Corporate Equity Securities [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Beginning Balance	3,833	2,942
Unrealized gains/(losses), Included in changes in net assets	(133)	(361)
Realized gains/(losses)	13	2,453
Purchases		3,593
Sales	(120)
Redemptions		(4,794)
Transfers, Out of Level 3	(3,593)
Net change	(3,833)	891
Ending Balance		3,833
Corporate Fixed Income Securities [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Beginning Balance	273
Purchases		292
Redemptions	(31)	(19)
Net change	(31)	273
Ending Balance	242	273
Equity Auction Rate Securities [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Beginning Balance	48,689	50,442
Unrealized gains/(losses), Included in changes in net assets	785	547
Purchases		50
Redemptions		(2,350)
Transfers, Out of Level 3	(14,685)
Net change	(13,900)	(1,753)
Ending Balance	34,789	48,689
Equity Securities [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Beginning Balance	600	619
Unrealized gains/(losses), Included in changes in net assets	(88)	(279)
Realized gains/(losses)	(259)
Purchases		253
Transfers, Into Level 3		7
Net change	(347)	(19)
Ending Balance	253	600
Auction Rate Municipal Securities [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Beginning Balance	832	1,315
Unrealized gains/(losses), Included in changes in net assets	14	67
Redemptions		(550)
Net change	14	(483)
Ending Balance	846	832
Other Investment [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Beginning Balance	1,240	20
Realized gains/(losses)	(383)
Purchases		3,782
Transfers, Into Level 3		465
Transfers, Out of Level 3		(3,027)
Net change	(383)	1,220
Ending Balance	$ 857	$ 1,240

Fair Value Of Financial Instr68

Fair Value Of Financial Instruments (Quantitative Information related To The Significant Unobservable Inputs Utilized In Company's Level 3 Recurring Fair Value Measurements) (Details) - Discounted Cash Flow [Member]	12 Months Ended
	Dec. 31, 2017
Auction Rate Equity Securities [Member]
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Workout period range, low end	1 year
Workout period range, high end	3 years
Discount rate, weighted average	4.80%
Weighted average workout period	2 years 2 months 12 days
Auction Rate Equity Securities [Member] | Minimum [Member]
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Discount rate range	0.80%
Auction Rate Equity Securities [Member] | Maximum [Member]
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Discount rate range	9.80%
Auction Rate Municipal Securities [Member]
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Workout period range, low end	1 year
Workout period range, high end	4 years
Discount rate, weighted average	3.40%
Weighted average workout period	1 year 10 months 24 days
Auction Rate Municipal Securities [Member] | Minimum [Member]
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Discount rate range	1.00%
Auction Rate Municipal Securities [Member] | Maximum [Member]
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Discount rate range	9.10%

Fair Value Of Financial Instr69

Fair Value Of Financial Instruments (Narrative) (Details) $ in Millions	12 Months Ended
	Dec. 31, 2017USD ($)
Fair Value Disclosures [Abstract]
Transfers of financial assets from Level 2 to Level 1	$ 1.1
Transfers of financial assets from Level 1 to Level 2	4.9
Transfers of financial assets into Level 3	0
Transfers of financial assets out of Level 3	$ 18.3
Stated interest rate	4.25%
Maturity date	Dec. 31, 2024

Fair Value Of Financial Instr70

Fair Value Of Financial Instruments (Schedule Of Fair Value Of Financial Instruments) (Details) - USD ($) $ in Thousands		Dec. 31, 2017	Dec. 31, 2016
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Securities purchased under agreements to resell	[1]	$ 512,220	$ 248,588
Financial instruments owned		1,143,684	925,045
Available-for-sale securities		3,773,508	3,181,313
Held-to-maturity securities	[2]	3,710,478	3,040,554
Investments, at fair value		111,379	133,563
Derivative contracts		7,995	10,390
Securities sold under agreements to repurchase	[3]	233,704	268,546
Bank deposits		13,411,935	11,527,483
Financial instruments sold, but not yet purchased, at fair value		778,863	699,032
Derivative contracts			1,823
Borrowings		256,000	377,000
Carrying Value [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and cash equivalents		696,283	912,932
Cash segregated for regulatory purposes		90,802	73,235
Securities purchased under agreements to resell		512,220	248,588
Financial instruments owned		1,143,684	925,045
Available-for-sale securities		3,773,508	3,181,313
Held-to-maturity securities		3,698,098	3,038,405
Loans held for sale		226,068	228,588
Bank loans		6,947,759	5,591,190
Investments, at fair value		111,379	133,563
Derivative contracts		7,995	10,390
Securities sold under agreements to repurchase		233,704	268,546
Bank deposits		13,411,935	11,527,483
Financial instruments sold, but not yet purchased, at fair value		778,863	699,032
Derivative contracts			1,823
Borrowings		256,000	377,000
Federal Home Loan Bank advances		745,000	500,000
Senior notes		1,014,940	795,891
Debentures to Stifel Financial Capital Trusts		67,500	67,500
Estimated Fair Value [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and cash equivalents		696,283	912,932
Cash segregated for regulatory purposes		90,802	73,235
Securities purchased under agreements to resell		512,220	248,588
Financial instruments owned		1,143,684	925,045
Available-for-sale securities		3,773,508	3,181,313
Held-to-maturity securities		3,710,478	3,040,554
Loans held for sale		226,068	228,588
Bank loans		6,953,328	5,633,804
Investments, at fair value		111,379	133,563
Derivative contracts		7,995	10,390
Securities sold under agreements to repurchase		233,704	268,546
Bank deposits		12,702,746	11,092,185
Financial instruments sold, but not yet purchased, at fair value		778,863	699,032
Derivative contracts			1,823
Borrowings		256,000	377,000
Federal Home Loan Bank advances		745,000	500,000
Senior notes		1,044,768	799,632
Debentures to Stifel Financial Capital Trusts		$ 64,962	$ 52,525
[1]	Collateral received includes securities received by our company from the counterparty. These securities are not included on the consolidated statements of financial condition unless there is an event of default. The fair value of securities pledged as collateral was $509.4 million and $248.5 million at December 31, 2017 and 2016, respectively.
[2]	Held-to-maturity securities are carried in the consolidated statements of financial condition at amortized cost, and the changes in the value of these securities, other than impairment charges, are not reported on the consolidated financial statements.
[3]	Collateral pledged includes the fair value of securities pledged by our company to the counter party. These securities are included on the consolidated statements of financial condition unless we default. Collateral pledged by our company to the counter party includes U.S. government agency securities, U.S. government securities, and corporate fixed income securities with market values of $241.4 million and $299.3 million at December 31, 2017 and 2016, respectively.

Fair Value Of Financial Instr71

Fair Value Of Financial Instruments (Estimated Fair Values Of Financial Instruments Not Measured At Fair Value On A Recurring Basis) (Details) - USD ($) $ in Thousands		Dec. 31, 2017	Dec. 31, 2016
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities purchased under agreements to resell	[1]	$ 512,220	$ 248,588
Held-to-maturity securities	[2]	3,710,478	3,040,554
Securities sold under agreements to repurchase	[3]	233,704	268,546
Bank deposits		13,411,935	11,527,483
Borrowings		256,000	377,000
Senior notes		1,014,940	795,891
Fair Value, Measurements, Nonrecurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash		618,842	877,295
Cash segregated for regulatory purposes		90,802	73,235
Securities purchased under agreements to resell		512,220	248,588
Held-to-maturity securities		3,710,478	3,040,554
Loans held for sale		226,068	228,588
Bank loans		6,953,328	5,633,804
Securities sold under agreements to repurchase		233,704	268,546
Bank deposits		12,702,746	11,092,185
Borrowings		256,000	377,000
Federal Home Loan Bank advances		745,000	500,000
Senior notes		1,044,768	799,632
Debentures to Stifel Financial Capital Trusts		64,962	52,525
Fair Value, Measurements, Nonrecurring [Member] | Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash		618,842	877,295
Cash segregated for regulatory purposes		90,802	73,235
Securities purchased under agreements to resell		428,740	227,983
Securities sold under agreements to repurchase		92,278	149,881
Borrowings		256,000	377,000
Federal Home Loan Bank advances		745,000	500,000
Senior notes		1,044,768	799,632
Fair Value, Measurements, Nonrecurring [Member] | Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities purchased under agreements to resell		83,480	20,605
Held-to-maturity securities		3,517,781	2,830,869
Loans held for sale		226,068	228,588
Bank loans		6,953,328	5,633,804
Securities sold under agreements to repurchase		141,426	118,665
Bank deposits		12,702,746	11,092,185
Fair Value, Measurements, Nonrecurring [Member] | Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Held-to-maturity securities		192,697	209,685
Debentures to Stifel Financial Capital Trusts		$ 64,962	$ 52,525
[1]	Collateral received includes securities received by our company from the counterparty. These securities are not included on the consolidated statements of financial condition unless there is an event of default. The fair value of securities pledged as collateral was $509.4 million and $248.5 million at December 31, 2017 and 2016, respectively.
[2]	Held-to-maturity securities are carried in the consolidated statements of financial condition at amortized cost, and the changes in the value of these securities, other than impairment charges, are not reported on the consolidated financial statements.
[3]	Collateral pledged includes the fair value of securities pledged by our company to the counter party. These securities are included on the consolidated statements of financial condition unless we default. Collateral pledged by our company to the counter party includes U.S. government agency securities, U.S. government securities, and corporate fixed income securities with market values of $241.4 million and $299.3 million at December 31, 2017 and 2016, respectively.

Financial Instruments Owned A72

Financial Instruments Owned And Financial Instruments Sold, But Not Yet Purchased (Components Of Trading Securities Owned And Trading Securities Sold, But Not Yet Purchased) (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Schedule Of Trading Securities And Other Trading Assets [Line Items]
Financial instruments owned, at fair value	$ 1,143,684	$ 925,045
U.S. Government Agency Securities [Member]
Schedule Of Trading Securities And Other Trading Assets [Line Items]
Financial instruments owned, at fair value	147,223	89,833
Corporate Fixed Income Securities [Member]
Schedule Of Trading Securities And Other Trading Assets [Line Items]
Financial instruments owned, at fair value	329,179	269,561
Corporate Equity Securities [Member]
Schedule Of Trading Securities And Other Trading Assets [Line Items]
Financial instruments owned, at fair value	46,802	32,044
State and Municipal Securities [Member]
Schedule Of Trading Securities And Other Trading Assets [Line Items]
Financial instruments owned, at fair value	169,699	159,095
U.S. Government Securities [Member]
Schedule Of Trading Securities And Other Trading Assets [Line Items]
Financial instruments owned, at fair value	13,466	9,951
Mortgage Backed Securities [Member] | Non-Agency [Member]
Schedule Of Trading Securities And Other Trading Assets [Line Items]
Financial instruments owned, at fair value	75,154	28,402
Mortgage Backed Securities [Member] | Agency [Member]
Schedule Of Trading Securities And Other Trading Assets [Line Items]
Financial instruments owned, at fair value	329,691	305,774
Sovereign Debt [Member]
Schedule Of Trading Securities And Other Trading Assets [Line Items]
Financial instruments owned, at fair value	32,470	30,385
Securities Sold, But Not yet Purchased [Member]
Schedule Of Trading Securities And Other Trading Assets [Line Items]
Financial instruments owned, at fair value	778,863	699,032
Securities Sold, But Not yet Purchased [Member] | U.S. Government Agency Securities [Member]
Schedule Of Trading Securities And Other Trading Assets [Line Items]
Trading securities owned	10,348	20,549
Securities Sold, But Not yet Purchased [Member] | Corporate Fixed Income Securities [Member]
Schedule Of Trading Securities And Other Trading Assets [Line Items]
Fixed income securities	180,755	175,301
Securities Sold, But Not yet Purchased [Member] | Corporate Equity Securities [Member]
Schedule Of Trading Securities And Other Trading Assets [Line Items]
Equity securities	38,510	18,395
Securities Sold, But Not yet Purchased [Member] | State and Municipal Securities [Member]
Schedule Of Trading Securities And Other Trading Assets [Line Items]
State and municipal securities		31
Securities Sold, But Not yet Purchased [Member] | U.S. Government Securities [Member]
Schedule Of Trading Securities And Other Trading Assets [Line Items]
Trading securities owned	442,402	362,536
Securities Sold, But Not yet Purchased [Member] | Mortgage Backed Securities [Member] | Non-Agency [Member]
Schedule Of Trading Securities And Other Trading Assets [Line Items]
Trading securities owned		1
Securities Sold, But Not yet Purchased [Member] | Mortgage Backed Securities [Member] | Agency [Member]
Schedule Of Trading Securities And Other Trading Assets [Line Items]
Trading securities owned	86,612	94,552
Securities Sold, But Not yet Purchased [Member] | Sovereign Debt [Member]
Schedule Of Trading Securities And Other Trading Assets [Line Items]
Sovereign debt	20,236	27,667
Securities Owned
Schedule Of Trading Securities And Other Trading Assets [Line Items]
Financial instruments owned, at fair value	1,143,684	925,045
Securities Owned | U.S. Government Agency Securities [Member]
Schedule Of Trading Securities And Other Trading Assets [Line Items]
Trading securities owned	147,223	89,833
Securities Owned | Corporate Fixed Income Securities [Member]
Schedule Of Trading Securities And Other Trading Assets [Line Items]
Fixed income securities	329,179	269,561
Securities Owned | Corporate Equity Securities [Member]
Schedule Of Trading Securities And Other Trading Assets [Line Items]
Equity securities	46,802	32,044
Securities Owned | State and Municipal Securities [Member]
Schedule Of Trading Securities And Other Trading Assets [Line Items]
State and municipal securities	169,699	159,095
Securities Owned | U.S. Government Securities [Member]
Schedule Of Trading Securities And Other Trading Assets [Line Items]
Trading securities owned	13,466	9,951
Securities Owned | Mortgage Backed Securities [Member] | Non-Agency [Member]
Schedule Of Trading Securities And Other Trading Assets [Line Items]
Trading securities owned	75,154	28,402
Securities Owned | Mortgage Backed Securities [Member] | Agency [Member]
Schedule Of Trading Securities And Other Trading Assets [Line Items]
Trading securities owned	329,691	305,774
Securities Owned | Sovereign Debt [Member]
Schedule Of Trading Securities And Other Trading Assets [Line Items]
Sovereign debt	$ 32,470	$ 30,385

Financial Instruments Owned A73

Financial Instruments Owned And Financial Instruments Sold, But Not Yet Purchased (Narrative) (Details) - USD ($) $ in Millions	Dec. 31, 2017	Dec. 31, 2016
Schedule Of Trading Securities And Other Trading Assets [Line Items]
Financial instruments pledged as collateral	$ 2,200	$ 2,000
Financial instruments owned	1,300
Securities Owned
Schedule Of Trading Securities And Other Trading Assets [Line Items]
Financial instruments pledged as collateral	$ 810.3	$ 992.9

Available-For-Sale And Held-T74

Available-For-Sale And Held-To-Maturity Securities (Schedule Of Amortized Cost And Fair Values Of The Available For Sale Securities And Held To Maturity Securities) (Details) - USD ($) $ in Thousands		Dec. 31, 2017	Dec. 31, 2016
Schedule Of Available For Sale And Held To Maturity Securities [Line Items]
Available-for-sale Securities, Amortized cost		$ 3,777,458	$ 3,190,090
Available for sale securities, unrealized gains	[1]	16,839	11,634
Available-for-sale Securities, Gross unrealized losses	[1]	(20,789)	(20,411)
Available-for-sale securities		3,773,508	3,181,313
Held-to-maturity Securities, Amortized cost	[2]	3,698,098	3,038,405
Held-to-maturity Securities, Gross unrealized gains	[2]	30,487	22,595
Held-to-maturity Securities, Gross unrealized losses	[2]	(18,107)	(20,446)
Held-to-maturity securities, Estimated fair value	[2]	3,710,478	3,040,554
U.S. Government Agency Securities [Member]
Schedule Of Available For Sale And Held To Maturity Securities [Line Items]
Available-for-sale Securities, Amortized cost		5,022	4,213
Available for sale securities, unrealized gains	[1]		2
Available-for-sale Securities, Gross unrealized losses	[1]	(39)	(18)
Available-for-sale securities		4,983	4,197
State And Municipal Securities [Member]
Schedule Of Available For Sale And Held To Maturity Securities [Line Items]
Available-for-sale Securities, Amortized cost		74,691	76,066
Available-for-sale Securities, Gross unrealized losses	[1]	(4,132)	(3,576)
Available-for-sale securities		70,559	72,490
Corporate Fixed Income Securities [Member]
Schedule Of Available For Sale And Held To Maturity Securities [Line Items]
Available-for-sale Securities, Amortized cost		1,213,262	830,695
Available for sale securities, unrealized gains	[1]	3,832	1,418
Available-for-sale Securities, Gross unrealized losses	[1]	(5,652)	(8,602)
Available-for-sale securities		1,211,442	823,511
Held-to-maturity Securities, Amortized cost	[2]	40,011	40,078
Held-to-maturity Securities, Gross unrealized gains	[2]	27	30
Held-to-maturity Securities, Gross unrealized losses	[2]	(37)
Held-to-maturity securities, Estimated fair value	[2]	40,001	40,108
Asset-Backed Securities [Member]
Schedule Of Available For Sale And Held To Maturity Securities [Line Items]
Available-for-sale Securities, Amortized cost		2,098,958	1,858,929
Available for sale securities, unrealized gains	[1]	12,877	9,857
Available-for-sale Securities, Gross unrealized losses	[1]	(4,897)	(1,068)
Available-for-sale securities		2,106,938	1,867,718
Held-to-maturity Securities, Amortized cost	[2]	2,264,283	1,370,300
Held-to-maturity Securities, Gross unrealized gains	[2]	15,526	6,242
Held-to-maturity Securities, Gross unrealized losses	[2]	(1,862)	(3,396)
Held-to-maturity securities, Estimated fair value	[2]	2,277,947	1,373,146
Mortgage Backed Securities [Member] | Agency [Member]
Schedule Of Available For Sale And Held To Maturity Securities [Line Items]
Available-for-sale Securities, Amortized cost		308,409	340,738
Available for sale securities, unrealized gains	[1]	102	298
Available-for-sale Securities, Gross unrealized losses	[1]	(2,981)	(2,304)
Available-for-sale securities		305,530	338,732
Held-to-maturity Securities, Amortized cost	[2]	1,334,833	1,567,758
Held-to-maturity Securities, Gross unrealized gains	[2]	13,621	14,537
Held-to-maturity Securities, Gross unrealized losses	[2]	(16,208)	(17,037)
Held-to-maturity securities, Estimated fair value	[2]	1,332,246	1,565,258
Mortgage Backed Securities [Member] | Commercial [Member]
Schedule Of Available For Sale And Held To Maturity Securities [Line Items]
Available-for-sale Securities, Amortized cost		75,548	77,417
Available for sale securities, unrealized gains	[1]	28	59
Available-for-sale Securities, Gross unrealized losses	[1]	(3,088)	(4,703)
Available-for-sale securities		72,488	72,773
Held-to-maturity Securities, Amortized cost	[2]	58,971	59,581
Held-to-maturity Securities, Gross unrealized gains	[2]	1,313	1,786
Held-to-maturity securities, Estimated fair value	[2]	60,284	61,367
Mortgage Backed Securities [Member] | Non-Agency [Member]
Schedule Of Available For Sale And Held To Maturity Securities [Line Items]
Available-for-sale Securities, Amortized cost		1,568	2,032
Available-for-sale Securities, Gross unrealized losses	[1]		(140)
Available-for-sale securities		$ 1,568	1,892
Held-to-maturity Securities, Amortized cost	[2]		688
Held-to-maturity Securities, Gross unrealized losses	[2]		(13)
Held-to-maturity securities, Estimated fair value	[2]		$ 675
[1]	Unrealized gains/(losses) related to available-for-sale securities are reported in accumulated other comprehensive loss.
[2]	Held-to-maturity securities are carried in the consolidated statements of financial condition at amortized cost, and the changes in the value of these securities, other than impairment charges, are not reported on the consolidated financial statements.

Available-For-Sale And Held-T75

Available-For-Sale And Held-To-Maturity Securities (Narrative) (Details) $ in Thousands		12 Months Ended
		Dec. 31, 2017USD ($)security	Dec. 31, 2016USD ($)	Dec. 31, 2015USD ($)
Other Than Temporary Impairment Credit Losses Recognized In Earnings [Line Items]
Proceeds from sale of available-for-sale securities		$ 87,300	$ 0	$ 641,600
Net realized gains resulting from sale of available-for-sale securities		400		3,200
Unrealized gains (losses) recorded in accumulated other comprehensive loss	[1],[2]	4,730	5,803	1,389
Financial instruments pledged as collateral		2,200,000	2,000,000
Trading securities pledged		$ 2,000,000	1,700,000
Number of available for sale securities whose amortized costs exceeded their fair values | security		186
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Losses		$ 20,789
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Losses		12,257
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value		$ 1,284,490
Percentage of available-for-sale portfolio		34.00%
Held-to-maturity, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions | security		42
Held-to-maturity Securities, Continuous Unrealized Loss Position, Aggregate Loss		$ 18,107
Held-to-maturity Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Loss		17,298
Credit-related OTTI		0	0	$ 0
Gross unrealized losses related to investment portfolio	[3]	20,789	$ 20,411
Available-for-sale and Held-to-maturity Securities [Member]
Other Than Temporary Impairment Credit Losses Recognized In Earnings [Line Items]
Gross unrealized losses related to investment portfolio		$ 38,900
[1]	Net of taxes of $3.3 million, $0.3 million, and $0.7 million for the years ended December 31, 2017, 2016, and 2015, respectively.
[2]	There were no reclassifications to earnings of realized gains for the years ended December 31, 2017 and 2016. Amounts are net of reclassifications to earnings of realized gains of $2.1 million for the year ended December 31, 2015.
[3]	Unrealized gains/(losses) related to available-for-sale securities are reported in accumulated other comprehensive loss.

Available-For-Sale And Held-T76

Available-For-Sale And Held-To-Maturity Securities (Schedule Of Amortized Cost And Fair Values Of Debt Securities By Contractual Maturity) (Details) - USD ($) $ in Thousands		Dec. 31, 2017	Dec. 31, 2016
Schedule Of Debt Securities At Amortized Cost And Fair Value Basis [Line Items]
Available-for-sale Securities, debt maturities, Amortized Cost		$ 3,777,458
Available-for-sale Securities, debt maturities, within one year, Fair Value	[1]	184,021
Available-for-sale Securities, debt maturities, after five through ten years, fair value	[1]	978,587
Availably-for-sale Securities, debt maturities, after ten years, Fair Value	[1]	2,065,075
Available-for-sale Securities, debt maturities, Fair Value	[1]	3,773,508
Held-to-maturity Securities, debt maturities, within one year, Amortized Cost		40,011
Held-to-maturity Securities, debt maturities, after five through ten years, Amortized Cost		547,555
Held-to-maturity Securities, debt maturities, after ten years, Amortized Cost		3,051,561
Held-to-maturity Securities, Amortized cost	[2]	3,698,098	$ 3,038,405
Held-to-maturity Securities, debt maturities, Fair Value	[2]	3,710,478	$ 3,040,554
Excluding Mortgage Backed Securities [Member]
Schedule Of Debt Securities At Amortized Cost And Fair Value Basis [Line Items]
Available-for-sale Securities, debt maturities, within one year, Amortized Cost		184,101
Available-for-sale Securities, debt maturities, after one year through three years, Amortized Cost		229,680
Available-for-sale Securities, debt maturities, after three year through five years, Amortized Cost		318,964
Available-for-sale Securities, debt maturities, after five through ten years, Amortized Cost		920,147
Availably-for-sale Securities, debt maturities, after ten years, Amortized Cost		1,739,041
Available-for-sale Securities, debt maturities, within one year, Fair Value		184,021
Available-for-sale Securities, debt maturities, after one year through three years, Fair Value		229,627
Available-for-sale Securities, debt maturities, after three year through five years, Fair Value		316,198
Available-for-sale Securities, debt maturities, after five through ten years, fair value		922,763
Availably-for-sale Securities, debt maturities, after ten years, Fair Value		1,741,313
Held-to-maturity Securities, debt maturities, within one year, Amortized Cost		40,011
Held-to-maturity Securities, debt maturities, after five through ten years, Amortized Cost		403,840
Held-to-maturity Securities, debt maturities, after ten years, Amortized Cost		1,860,443
Held-to-maturity Securities, debt maturities, within one year, Fair Value		40,001
Held-to-maturity Securities, debt maturities, after five through ten years, Fair Value		405,319
Held-to-maturity Securities, debt maturities, after ten years, Fair Value		1,872,628
Mortgage Backed Securities [Member]
Schedule Of Debt Securities At Amortized Cost And Fair Value Basis [Line Items]
Available-for-sale Securities, debt maturities, after five through ten years, Amortized Cost		58,263
Availably-for-sale Securities, debt maturities, after ten years, Amortized Cost		327,262
Available-for-sale Securities, debt maturities, after five through ten years, fair value		55,824
Availably-for-sale Securities, debt maturities, after ten years, Fair Value		323,762
Held-to-maturity Securities, debt maturities, after three year through five years, Amortized Cost		58,971
Held-to-maturity Securities, debt maturities, after five through ten years, Amortized Cost		143,715
Held-to-maturity Securities, debt maturities, after ten years, Amortized Cost		1,191,118
Held-to-maturity Securities, debt maturities, after three year through five years, Fair Value		60,284
Held-to-maturity Securities, debt maturities, after five through ten years, Fair Value		141,770
Held-to-maturity Securities, debt maturities, after ten years, Fair Value		$ 1,190,476
[1]	Due to the immaterial amount of income recognized on tax-exempt securities, yields were not calculated on a tax-equivalent basis.
[2]	Held-to-maturity securities are carried in the consolidated statements of financial condition at amortized cost, and the changes in the value of these securities, other than impairment charges, are not reported on the consolidated financial statements.

Available-For-Sale And Held-T77

Available-For-Sale And Held-To-Maturity Securities (Contractual Maturities) (Details) - USD ($) $ in Thousands		Dec. 31, 2017	Dec. 31, 2016
Schedule Of Available For Sale And Held To Maturity Securities [Line Items]
Available-for-sale Securities, debt maturities, within one year, Fair Value	[1]	$ 184,021
Available-for-sale Securities, debt maturities, after one year through five, Fair Value	[1]	545,825
Available-for-sale Securities, debt maturities, after five through ten years, fair value	[1]	978,587
Availably-for-sale Securities, debt maturities, after ten years, Fair Value	[1]	2,065,075
Available-for-sale Securities, debt maturities, Fair Value	[1]	3,773,508
Held-to-maturity Securities, debt maturities, within one year, Amortized Cost		40,011
Held-to-maturity Securities, debt maturities, after one year through five, Amortized Cost		58,971
Held-to-maturity Securities, debt maturities, after five year through ten, Amortized Cost		547,555
Held-to-maturity Securities, debt maturities, after ten years, Amortized Cost		3,051,561
Held-to-maturity Securities, Amortized cost	[2]	3,698,098	$ 3,038,405
U.S. Government Agency Securities [Member]
Schedule Of Available For Sale And Held To Maturity Securities [Line Items]
Available-for-sale Securities, debt maturities, within one year, Fair Value	[1]	1,722
Available-for-sale Securities, debt maturities, after one year through five, Fair Value	[1]	3,261
Available-for-sale Securities, debt maturities, Fair Value	[1]	4,983
State And Municipal Securities [Member]
Schedule Of Available For Sale And Held To Maturity Securities [Line Items]
Available-for-sale Securities, debt maturities, within one year, Fair Value	[1]	274
Available-for-sale Securities, debt maturities, after one year through five, Fair Value	[1]	84
Available-for-sale Securities, debt maturities, after five through ten years, fair value	[1]	18,745
Availably-for-sale Securities, debt maturities, after ten years, Fair Value	[1]	51,456
Available-for-sale Securities, debt maturities, Fair Value	[1]	70,559
Corporate Fixed Income Securities [Member]
Schedule Of Available For Sale And Held To Maturity Securities [Line Items]
Available-for-sale Securities, debt maturities, within one year, Fair Value	[1]	182,025
Available-for-sale Securities, debt maturities, after one year through five, Fair Value	[1]	542,480
Available-for-sale Securities, debt maturities, after five through ten years, fair value	[1]	486,937
Available-for-sale Securities, debt maturities, Fair Value	[1]	1,211,442
Held-to-maturity Securities, debt maturities, within one year, Amortized Cost		40,011
Held-to-maturity Securities, Amortized cost	[2]	40,011	40,078
Asset-Backed Securities [Member]
Schedule Of Available For Sale And Held To Maturity Securities [Line Items]
Available-for-sale Securities, debt maturities, after five through ten years, fair value	[1]	417,081
Availably-for-sale Securities, debt maturities, after ten years, Fair Value	[1]	1,689,857
Available-for-sale Securities, debt maturities, Fair Value	[1]	2,106,938
Held-to-maturity Securities, debt maturities, after five year through ten, Amortized Cost		403,840
Held-to-maturity Securities, debt maturities, after ten years, Amortized Cost		1,860,443
Held-to-maturity Securities, Amortized cost	[2]	2,264,283	1,370,300
Mortgage Backed Securities [Member]
Schedule Of Available For Sale And Held To Maturity Securities [Line Items]
Available-for-sale Securities, debt maturities, after five through ten years, fair value		55,824
Availably-for-sale Securities, debt maturities, after ten years, Fair Value		323,762
Held-to-maturity Securities, debt maturities, after five year through ten, Amortized Cost		143,715
Held-to-maturity Securities, debt maturities, after ten years, Amortized Cost		1,191,118
Mortgage Backed Securities [Member] | Agency [Member]
Schedule Of Available For Sale And Held To Maturity Securities [Line Items]
Available-for-sale Securities, debt maturities, after five through ten years, fair value	[1]	338
Availably-for-sale Securities, debt maturities, after ten years, Fair Value	[1]	305,192
Available-for-sale Securities, debt maturities, Fair Value	[1]	305,530
Held-to-maturity Securities, debt maturities, after five year through ten, Amortized Cost		143,715
Held-to-maturity Securities, debt maturities, after ten years, Amortized Cost		1,191,118
Held-to-maturity Securities, Amortized cost	[2]	1,334,833	1,567,758
Mortgage Backed Securities [Member] | Commercial [Member]
Schedule Of Available For Sale And Held To Maturity Securities [Line Items]
Available-for-sale Securities, debt maturities, after five through ten years, fair value	[1]	55,486
Availably-for-sale Securities, debt maturities, after ten years, Fair Value	[1]	17,002
Available-for-sale Securities, debt maturities, Fair Value	[1]	72,488
Held-to-maturity Securities, debt maturities, after one year through five, Amortized Cost		58,971
Held-to-maturity Securities, Amortized cost	[2]	58,971	59,581
Mortgage Backed Securities [Member] | Non-Agency [Member]
Schedule Of Available For Sale And Held To Maturity Securities [Line Items]
Availably-for-sale Securities, debt maturities, after ten years, Fair Value	[1]	1,568
Available-for-sale Securities, debt maturities, Fair Value	[1]	$ 1,568
Held-to-maturity Securities, Amortized cost	[2]		$ 688
[1]	Due to the immaterial amount of income recognized on tax-exempt securities, yields were not calculated on a tax-equivalent basis.
[2]	Held-to-maturity securities are carried in the consolidated statements of financial condition at amortized cost, and the changes in the value of these securities, other than impairment charges, are not reported on the consolidated financial statements.

Available-For-Sale And Held-T78

Available-For-Sale And Held-To-Maturity Securities (Schedule Of Gross Unrealized Losses And The Estimated Fair Value By Length Of Time In A Loss Position) (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2017USD ($)
Schedule Of Available For Sale And Held To Maturity Securities [Line Items]
Available-for-sale Securities, Gross unrealized losses, Less than 12 months	$ (8,532)
Available-for-sale Securities, Estimated fair value, Less than 12 months	800,808
Available-for-sale Securities, Gross unrealized losses, 12 months or more	(12,257)
Available-for-sale Securities, Estimated fair value, 12 months or more	483,682
Available-for-sale Securities, Gross unrealized losses, Total	(20,789)
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value, Total	1,284,490
Held-to-maturity Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Loss	(809)
Held-to-maturity Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value	115,845
Held-to-maturity Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Loss	(17,298)
Held-to-maturity Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value	740,715
Held-to-maturity Securities, Continuous Unrealized Loss Position, Aggregate Loss, Total	(18,107)
Held-to-maturity Securities, Continuous Unrealized Loss Position, Fair Value, Total	856,560
U.S. Government Agency Securities [Member]
Schedule Of Available For Sale And Held To Maturity Securities [Line Items]
Available-for-sale Securities, Gross unrealized losses, Less than 12 months	(39)
Available-for-sale Securities, Estimated fair value, Less than 12 months	4,983
Available-for-sale Securities, Gross unrealized losses, Total	(39)
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value, Total	4,983
State And Municipal Securities [Member]
Schedule Of Available For Sale And Held To Maturity Securities [Line Items]
Available-for-sale Securities, Gross unrealized losses, Less than 12 months	(59)
Available-for-sale Securities, Estimated fair value, Less than 12 months	2,797
Available-for-sale Securities, Gross unrealized losses, 12 months or more	(4,073)
Available-for-sale Securities, Estimated fair value, 12 months or more	67,762
Available-for-sale Securities, Gross unrealized losses, Total	(4,132)
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value, Total	70,559
Corporate Fixed Income Securities [Member]
Schedule Of Available For Sale And Held To Maturity Securities [Line Items]
Available-for-sale Securities, Gross unrealized losses, Less than 12 months	(2,513)
Available-for-sale Securities, Estimated fair value, Less than 12 months	504,591
Available-for-sale Securities, Gross unrealized losses, 12 months or more	(3,139)
Available-for-sale Securities, Estimated fair value, 12 months or more	185,879
Available-for-sale Securities, Gross unrealized losses, Total	(5,652)
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value, Total	690,470
Held-to-maturity Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Loss	(37)
Held-to-maturity Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value	9,965
Held-to-maturity Securities, Continuous Unrealized Loss Position, Aggregate Loss, Total	(37)
Held-to-maturity Securities, Continuous Unrealized Loss Position, Fair Value, Total	9,965
Asset-Backed Securities [Member]
Schedule Of Available For Sale And Held To Maturity Securities [Line Items]
Available-for-sale Securities, Gross unrealized losses, Less than 12 months	(4,897)
Available-for-sale Securities, Estimated fair value, Less than 12 months	175,074
Available-for-sale Securities, Gross unrealized losses, Total	(4,897)
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value, Total	175,074
Held-to-maturity Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Loss	(29)
Held-to-maturity Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value	29,399
Held-to-maturity Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Loss	(1,833)
Held-to-maturity Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value	42,906
Held-to-maturity Securities, Continuous Unrealized Loss Position, Aggregate Loss, Total	(1,862)
Held-to-maturity Securities, Continuous Unrealized Loss Position, Fair Value, Total	72,305
Mortgage Backed Securities [Member] | Agency [Member]
Schedule Of Available For Sale And Held To Maturity Securities [Line Items]
Available-for-sale Securities, Gross unrealized losses, Less than 12 months	(1,024)
Available-for-sale Securities, Estimated fair value, Less than 12 months	113,363
Available-for-sale Securities, Gross unrealized losses, 12 months or more	(1,957)
Available-for-sale Securities, Estimated fair value, 12 months or more	158,880
Available-for-sale Securities, Gross unrealized losses, Total	(2,981)
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value, Total	272,243
Held-to-maturity Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Loss	(743)
Held-to-maturity Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value	76,481
Held-to-maturity Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Loss	(15,465)
Held-to-maturity Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value	697,809
Held-to-maturity Securities, Continuous Unrealized Loss Position, Aggregate Loss, Total	(16,208)
Held-to-maturity Securities, Continuous Unrealized Loss Position, Fair Value, Total	774,290
Mortgage Backed Securities [Member] | Commercial [Member]
Schedule Of Available For Sale And Held To Maturity Securities [Line Items]
Available-for-sale Securities, Gross unrealized losses, 12 months or more	(3,088)
Available-for-sale Securities, Estimated fair value, 12 months or more	71,161
Available-for-sale Securities, Gross unrealized losses, Total	(3,088)
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value, Total	$ 71,161

Bank Loans (Schedule Of Balance

Bank Loans (Schedule Of Balance And Associated Percentage Of Each Major Loan Category In Bank Loan Portfolio) (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross bank loans	$ 7,014,421	$ 5,637,565
Unamortized loan premium/(discount), net	788	858
Loans in process	(856)	(49)
Unamortized loan fees, net	872	(2,021)
Allowance for loan losses	(67,466)	(45,163)	$ (29,787)
Bank loans, net	$ 6,947,759	$ 5,591,190
Gross bank loans, Percent	100.00%	100.00%
Residential Real Estate [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross bank loans	$ 2,593,576	$ 2,161,400
Allowance for loan losses	$ (8,430)	$ (2,660)	(1,241)
Gross bank loans, Percent	37.00%	38.40%
Commercial And Industrial [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross bank loans	$ 2,437,938	$ 1,710,399
Allowance for loan losses	$ (54,474)	$ (35,127)	(24,748)
Gross bank loans, Percent	34.80%	30.30%
Securities-Based Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross bank loans	$ 1,819,206	$ 1,614,033
Allowance for loan losses	$ (2,088)	$ (3,094)	(1,607)
Gross bank loans, Percent	25.90%	28.60%
Commercial Real Estate [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross bank loans	$ 116,258	$ 78,711
Allowance for loan losses	$ (1,520)	$ (1,363)	(264)
Gross bank loans, Percent	1.70%	1.40%
Consumer [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross bank loans	$ 24,508	$ 45,391
Allowance for loan losses	$ (16)	$ (129)	(105)
Gross bank loans, Percent	0.30%	0.80%
Home Equity Lines Of Credit [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross bank loans	$ 15,039	$ 15,008
Allowance for loan losses	$ (162)	$ (371)	(290)
Gross bank loans, Percent	0.20%	0.30%
Construction And Land [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross bank loans	$ 7,896	$ 12,623
Allowance for loan losses	$ (100)	$ (232)	$ (78)
Gross bank loans, Percent	0.10%	0.20%

Bank Loans (Narrative) (Details

Bank Loans (Narrative) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for sale, at lower of cost or market	$ 226,068	$ 228,588
Gains (losses) recognized from sale of loans	12,300	16,000	$ 12,700
Impaired loans more than 90 days past due	29,200	26,900
Troubled debt restructurings	9,100	9,700
Specific allowance	$ 9,105	$ 3,375
Collateralized loan portfolio	97.20%	97.90%
Residential Real Estate [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans pledged as collateral	$ 2,400,000	$ 2,400,000
Commercial Real Estate [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans pledged as collateral	2,300,000	2,300,000
Specific allowance		722
Stifel Financial Corp. [Member] | Executive Officers Directors and Their Affiliates [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans outstanding amount	8,400	5,600
Stifel Bank [Member] | Executive Officers Directors and Their Affiliates [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans outstanding amount	$ 4,000	$ 3,700

Bank Loans (Activity In The All

Bank Loans (Activity In The Allowance For Loan Losses By Portfolio Segment) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Financing Receivable Allowance For Credit Losses [Line Items]
Beginning Balance	$ 45,163	$ 29,787
Provision	25,320	15,659
Charge-offs	(3,058)	(296)
Recoveries	41	13
Ending Balance	67,466	45,163
Commercial And Industrial [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Beginning Balance	35,127	24,748
Provision	19,666	10,646
Charge-offs	(355)	(267)
Recoveries	36
Ending Balance	54,474	35,127
Securities-Based Loans [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Beginning Balance	3,094	1,607
Provision	(1,006)	1,487
Ending Balance	2,088	3,094
Residential Real Estate [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Beginning Balance	2,660	1,241
Provision	5,770	1,430
Charge-offs		(13)
Recoveries		2
Ending Balance	8,430	2,660
Qualitative [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Beginning Balance	2,187	1,454
Provision	(1,511)	733
Ending Balance	676	2,187
Consumer [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Beginning Balance	129	105
Provision	(115)	38
Charge-offs		(16)
Recoveries	2	2
Ending Balance	16	129
Commercial Real Estate [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Beginning Balance	1,363	264
Provision	2,860	1,090
Charge-offs	(2,703)
Recoveries		9
Ending Balance	1,520	1,363
Construction And Land [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Beginning Balance	232	78
Provision	(132)	154
Ending Balance	100	232
Home Equity Lines Of Credit [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Beginning Balance	371	290
Provision	(212)	81
Recoveries	3
Ending Balance	$ 162	$ 371

Bank Loans (Unpaid Principal Ba

Bank Loans (Unpaid Principal Balances Of Loans and Amount Of Allowance Allocated Based Upon Impairment Method by Portfolio Segment) (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Financing Receivable Allowance For Credit Losses [Line Items]
Allowance for Loan Losses, Individually Evaluated for Impairment	$ 9,105	$ 3,375
Allowance for Loan Losses, Collectively Evaluated for Impairment	58,361	41,788
Allowance for Loan Losses, Total	67,466	45,163	$ 29,787
Recorded Investment in Loans, Individually Evaluated for Impairment	29,213	26,934
Recorded Investment in Loans, Collectively Evaluated for Impairment	6,985,208	5,610,631
Recorded Investment in Loans, Total	7,014,421	5,637,565
Commercial And Industrial [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Allowance for Loan Losses, Individually Evaluated for Impairment	9,059	2,392
Allowance for Loan Losses, Collectively Evaluated for Impairment	45,415	32,735
Allowance for Loan Losses, Total	54,474	35,127	24,748
Recorded Investment in Loans, Individually Evaluated for Impairment	28,856	16,815
Recorded Investment in Loans, Collectively Evaluated for Impairment	2,409,082	1,693,584
Recorded Investment in Loans, Total	2,437,938	1,710,399
Securities-Based Loans [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Allowance for Loan Losses, Collectively Evaluated for Impairment	2,088	3,094
Allowance for Loan Losses, Total	2,088	3,094	1,607
Recorded Investment in Loans, Collectively Evaluated for Impairment	1,819,206	1,614,033
Recorded Investment in Loans, Total	1,819,206	1,614,033
Consumer [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Allowance for Loan Losses, Individually Evaluated for Impairment	2	6
Allowance for Loan Losses, Collectively Evaluated for Impairment	14	123
Allowance for Loan Losses, Total	16	129	105
Recorded Investment in Loans, Individually Evaluated for Impairment	2	6
Recorded Investment in Loans, Collectively Evaluated for Impairment	24,506	45,385
Recorded Investment in Loans, Total	24,508	45,391
Residential Real Estate [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Allowance for Loan Losses, Individually Evaluated for Impairment	24	24
Allowance for Loan Losses, Collectively Evaluated for Impairment	8,406	2,636
Allowance for Loan Losses, Total	8,430	2,660	1,241
Recorded Investment in Loans, Individually Evaluated for Impairment	171	178
Recorded Investment in Loans, Collectively Evaluated for Impairment	2,593,405	2,161,222
Recorded Investment in Loans, Total	2,593,576	2,161,400
Commercial Real Estate [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Allowance for Loan Losses, Individually Evaluated for Impairment		722
Allowance for Loan Losses, Collectively Evaluated for Impairment	1,520	641
Allowance for Loan Losses, Total	1,520	1,363	264
Recorded Investment in Loans, Individually Evaluated for Impairment		9,522
Recorded Investment in Loans, Collectively Evaluated for Impairment	116,258	69,189
Recorded Investment in Loans, Total	116,258	78,711
Home Equity Lines Of Credit [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Allowance for Loan Losses, Individually Evaluated for Impairment	20	231
Allowance for Loan Losses, Collectively Evaluated for Impairment	142	140
Allowance for Loan Losses, Total	162	371	290
Recorded Investment in Loans, Individually Evaluated for Impairment	184	413
Recorded Investment in Loans, Collectively Evaluated for Impairment	14,855	14,595
Recorded Investment in Loans, Total	15,039	15,008
Construction And Land [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Allowance for Loan Losses, Collectively Evaluated for Impairment	100	232
Allowance for Loan Losses, Total	100	232	78
Recorded Investment in Loans, Collectively Evaluated for Impairment	7,896	12,623
Recorded Investment in Loans, Total	7,896	12,623
Qualitative [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Allowance for Loan Losses, Collectively Evaluated for Impairment	676	2,187
Allowance for Loan Losses, Total	$ 676	$ 2,187	$ 1,454

Bank Loans (Recorded Balances O

Bank Loans (Recorded Balances Of Loans and Amount Of Allowance Allocated Based Upon Impairment Method by Portfolio Segment) (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Financing Receivable Allowance For Credit Losses [Line Items]
Allowance for Loan Losses, Individually Evaluated for Impairment	$ 9,105	$ 3,375
Allowance for Loan Losses, Collectively Evaluated for Impairment	58,361	41,788
Allowance for Loan Losses, Total	67,466	45,163	$ 29,787
Recorded Investment in Loans, Individually Evaluated for Impairment	29,213	26,934
Recorded Investment in Loans, Collectively Evaluated for Impairment	6,985,208	5,610,631
Recorded Investment in Loans, Total	7,014,421	5,637,565
Commercial And Industrial [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Allowance for Loan Losses, Individually Evaluated for Impairment	9,059	2,392
Allowance for Loan Losses, Collectively Evaluated for Impairment	45,415	32,735
Allowance for Loan Losses, Total	54,474	35,127	24,748
Recorded Investment in Loans, Individually Evaluated for Impairment	28,856	16,815
Recorded Investment in Loans, Collectively Evaluated for Impairment	2,409,082	1,693,584
Recorded Investment in Loans, Total	2,437,938	1,710,399
Securities-Based Loans [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Allowance for Loan Losses, Collectively Evaluated for Impairment	2,088	3,094
Allowance for Loan Losses, Total	2,088	3,094	1,607
Recorded Investment in Loans, Collectively Evaluated for Impairment	1,819,206	1,614,033
Recorded Investment in Loans, Total	1,819,206	1,614,033
Consumer [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Allowance for Loan Losses, Individually Evaluated for Impairment	2	6
Allowance for Loan Losses, Collectively Evaluated for Impairment	14	123
Allowance for Loan Losses, Total	16	129	105
Recorded Investment in Loans, Individually Evaluated for Impairment	2	6
Recorded Investment in Loans, Collectively Evaluated for Impairment	24,506	45,385
Recorded Investment in Loans, Total	24,508	45,391
Residential Real Estate [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Allowance for Loan Losses, Individually Evaluated for Impairment	24	24
Allowance for Loan Losses, Collectively Evaluated for Impairment	8,406	2,636
Allowance for Loan Losses, Total	8,430	2,660	1,241
Recorded Investment in Loans, Individually Evaluated for Impairment	171	178
Recorded Investment in Loans, Collectively Evaluated for Impairment	2,593,405	2,161,222
Recorded Investment in Loans, Total	2,593,576	2,161,400
Commercial Real Estate [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Allowance for Loan Losses, Individually Evaluated for Impairment		722
Allowance for Loan Losses, Collectively Evaluated for Impairment	1,520	641
Allowance for Loan Losses, Total	1,520	1,363	264
Recorded Investment in Loans, Individually Evaluated for Impairment		9,522
Recorded Investment in Loans, Collectively Evaluated for Impairment	116,258	69,189
Recorded Investment in Loans, Total	116,258	78,711
Home Equity Lines Of Credit [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Allowance for Loan Losses, Individually Evaluated for Impairment	20	231
Allowance for Loan Losses, Collectively Evaluated for Impairment	142	140
Allowance for Loan Losses, Total	162	371	290
Recorded Investment in Loans, Individually Evaluated for Impairment	184	413
Recorded Investment in Loans, Collectively Evaluated for Impairment	14,855	14,595
Recorded Investment in Loans, Total	15,039	15,008
Construction And Land [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Allowance for Loan Losses, Collectively Evaluated for Impairment	100	232
Allowance for Loan Losses, Total	100	232	78
Recorded Investment in Loans, Collectively Evaluated for Impairment	7,896	12,623
Recorded Investment in Loans, Total	7,896	12,623
Qualitative [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Allowance for Loan Losses, Collectively Evaluated for Impairment	676	2,187
Allowance for Loan Losses, Total	$ 676	$ 2,187	$ 1,454

Bank Loans (Loans That Were Ind

Bank Loans (Loans That Were Individually Evaluated For Impairment By Portfolio Segment) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Financing Receivable Impaired [Line Items]
Unpaid Contractual Principal Balance	$ 29,888	$ 28,742
Recorded Investment with No Allowance	5,211
Recorded Investment with Allowance	24,002	26,934
Total Recorded Investment	29,213	26,934
Related Allowance	9,105	3,375
Average Recorded Investment	30,756	32,242
Commercial And Industrial [Member]
Financing Receivable Impaired [Line Items]
Unpaid Contractual Principal Balance	28,856	16,815
Recorded Investment with No Allowance	5,211
Recorded Investment with Allowance	23,645	16,815
Total Recorded Investment	28,856	16,815
Related Allowance	9,059	2,392
Average Recorded Investment	30,277	22,559
Consumer [Member]
Financing Receivable Impaired [Line Items]
Unpaid Contractual Principal Balance	677	833
Recorded Investment with Allowance	2	6
Total Recorded Investment	2	6
Related Allowance	2	6
Average Recorded Investment	5	9
Residential Real Estate [Member]
Financing Receivable Impaired [Line Items]
Unpaid Contractual Principal Balance	171	178
Recorded Investment with Allowance	171	178
Total Recorded Investment	171	178
Related Allowance	24	24
Average Recorded Investment	174	181
Home Equity Lines Of Credit [Member]
Financing Receivable Impaired [Line Items]
Unpaid Contractual Principal Balance	184	413
Recorded Investment with Allowance	184	413
Total Recorded Investment	184	413
Related Allowance	20	231
Average Recorded Investment	$ 300	413
Commercial Real Estate [Member]
Financing Receivable Impaired [Line Items]
Unpaid Contractual Principal Balance		10,503
Recorded Investment with Allowance		9,522
Total Recorded Investment		9,522
Related Allowance		722
Average Recorded Investment		$ 9,080

Bank Loans (Aging Of The Record

Bank Loans (Aging Of The Recorded Investment In Past Due Loans) (Details) - USD ($)		Dec. 31, 2017		Dec. 31, 2016
Financing Receivable Recorded Investment Past Due [Line Items]
Total Past Due		$ 19,961,000		$ 11,721,000
Current Balance		6,994,460,000		5,625,844,000
Recorded Investment in Loans, Total		7,014,421,000		5,637,565,000
Non-accrual		20,090,000	[1]	17,234,000	[2]
Restructured		9,123,000	[1]	9,700,000	[2]
Total		29,213,000	[1]	26,934,000	[2]
Loans past due 90 days and still accruing interest		0		0
30 - 89 Days Past Due [Member]
Financing Receivable Recorded Investment Past Due [Line Items]
Total Past Due		19,961,000		11,523,000
90 or More Days Past Due [Member]
Financing Receivable Recorded Investment Past Due [Line Items]
Total Past Due				198,000
Commercial And Industrial [Member]
Financing Receivable Recorded Investment Past Due [Line Items]
Total Past Due		11,883,000
Current Balance		2,426,055,000		1,710,399,000
Recorded Investment in Loans, Total		2,437,938,000		1,710,399,000
Non-accrual		19,904,000	[1]	16,815,000	[2]
Restructured	[1]	8,952,000
Total		28,856,000	[1]	16,815,000	[2]
Commercial And Industrial [Member] | 30 - 89 Days Past Due [Member]
Financing Receivable Recorded Investment Past Due [Line Items]
Total Past Due		11,883,000
Securities-Based Loans [Member]
Financing Receivable Recorded Investment Past Due [Line Items]
Current Balance		1,819,206,000		1,614,033,000
Recorded Investment in Loans, Total		1,819,206,000		1,614,033,000
Consumer [Member]
Financing Receivable Recorded Investment Past Due [Line Items]
Total Past Due		2,000		2,000
Current Balance		24,506,000		45,389,000
Recorded Investment in Loans, Total		24,508,000		45,391,000
Non-accrual		2,000	[1]	6,000	[2]
Total		2,000	[1]	6,000	[2]
Consumer [Member] | 30 - 89 Days Past Due [Member]
Financing Receivable Recorded Investment Past Due [Line Items]
Total Past Due		2,000
Consumer [Member] | 90 or More Days Past Due [Member]
Financing Receivable Recorded Investment Past Due [Line Items]
Total Past Due				2,000
Residential Real Estate [Member]
Financing Receivable Recorded Investment Past Due [Line Items]
Total Past Due		7,892,000		1,923,000
Current Balance		2,585,684,000		2,159,477,000
Recorded Investment in Loans, Total		2,593,576,000		2,161,400,000
Restructured		171,000	[1]	178,000	[2]
Total		171,000	[1]	178,000	[2]
Residential Real Estate [Member] | 30 - 89 Days Past Due [Member]
Financing Receivable Recorded Investment Past Due [Line Items]
Total Past Due		7,892,000		1,923,000
Commercial Real Estate [Member]
Financing Receivable Recorded Investment Past Due [Line Items]
Total Past Due				9,522,000
Current Balance		116,258,000		69,189,000
Recorded Investment in Loans, Total		116,258,000		78,711,000
Restructured	[2]			9,522,000
Total	[2]			9,522,000
Commercial Real Estate [Member] | 30 - 89 Days Past Due [Member]
Financing Receivable Recorded Investment Past Due [Line Items]
Total Past Due				9,522,000
Home Equity Lines Of Credit [Member]
Financing Receivable Recorded Investment Past Due [Line Items]
Total Past Due		184,000		274,000
Current Balance		14,855,000		14,734,000
Recorded Investment in Loans, Total		15,039,000		15,008,000
Non-accrual		184,000	[1]	413,000	[2]
Total		184,000	[1]	413,000	[2]
Home Equity Lines Of Credit [Member] | 30 - 89 Days Past Due [Member]
Financing Receivable Recorded Investment Past Due [Line Items]
Total Past Due		184,000		78,000
Home Equity Lines Of Credit [Member] | 90 or More Days Past Due [Member]
Financing Receivable Recorded Investment Past Due [Line Items]
Total Past Due				196,000
Construction And Land [Member]
Financing Receivable Recorded Investment Past Due [Line Items]
Current Balance		7,896,000		12,623,000
Recorded Investment in Loans, Total		$ 7,896,000		$ 12,623,000
[1]	There were no loans past due 90 days and still accruing interest at December 31, 2017.
[2]	There were no loans past due 90 days and still accruing interest at December 31, 2016.

Bank Loans (Risk Category Of Lo

Bank Loans (Risk Category Of Loan Portfolio) (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Financing Receivable Recorded Investment [Line Items]
Total risk category of loan portfolio	$ 7,014,421	$ 5,637,565
Pass [Member]
Financing Receivable Recorded Investment [Line Items]
Total risk category of loan portfolio	6,960,969	5,569,259
Special Mention [Member]
Financing Receivable Recorded Investment [Line Items]
Total risk category of loan portfolio	22,752	27,905
Substandard [Member]
Financing Receivable Recorded Investment [Line Items]
Total risk category of loan portfolio	30,700	40,401
Commercial And Industrial [Member]
Financing Receivable Recorded Investment [Line Items]
Total risk category of loan portfolio	2,437,938	1,710,399
Commercial And Industrial [Member] | Pass [Member]
Financing Receivable Recorded Investment [Line Items]
Total risk category of loan portfolio	2,385,152	1,652,211
Commercial And Industrial [Member] | Special Mention [Member]
Financing Receivable Recorded Investment [Line Items]
Total risk category of loan portfolio	22,443	27,905
Commercial And Industrial [Member] | Substandard [Member]
Financing Receivable Recorded Investment [Line Items]
Total risk category of loan portfolio	30,343	30,283
Securities-Based Loans [Member]
Financing Receivable Recorded Investment [Line Items]
Total risk category of loan portfolio	1,819,206	1,614,033
Securities-Based Loans [Member] | Pass [Member]
Financing Receivable Recorded Investment [Line Items]
Total risk category of loan portfolio	1,819,206	1,614,033
Consumer [Member]
Financing Receivable Recorded Investment [Line Items]
Total risk category of loan portfolio	24,508	45,391
Consumer [Member] | Pass [Member]
Financing Receivable Recorded Investment [Line Items]
Total risk category of loan portfolio	24,506	45,385
Consumer [Member] | Substandard [Member]
Financing Receivable Recorded Investment [Line Items]
Total risk category of loan portfolio	2	6
Residential Real Estate [Member]
Financing Receivable Recorded Investment [Line Items]
Total risk category of loan portfolio	2,593,576	2,161,400
Residential Real Estate [Member] | Pass [Member]
Financing Receivable Recorded Investment [Line Items]
Total risk category of loan portfolio	2,593,096	2,161,223
Residential Real Estate [Member] | Special Mention [Member]
Financing Receivable Recorded Investment [Line Items]
Total risk category of loan portfolio	309
Residential Real Estate [Member] | Substandard [Member]
Financing Receivable Recorded Investment [Line Items]
Total risk category of loan portfolio	171	177
Commercial Real Estate [Member]
Financing Receivable Recorded Investment [Line Items]
Total risk category of loan portfolio	116,258	78,711
Commercial Real Estate [Member] | Pass [Member]
Financing Receivable Recorded Investment [Line Items]
Total risk category of loan portfolio	116,258	69,189
Commercial Real Estate [Member] | Substandard [Member]
Financing Receivable Recorded Investment [Line Items]
Total risk category of loan portfolio		9,522
Home Equity Lines Of Credit [Member]
Financing Receivable Recorded Investment [Line Items]
Total risk category of loan portfolio	15,039	15,008
Home Equity Lines Of Credit [Member] | Pass [Member]
Financing Receivable Recorded Investment [Line Items]
Total risk category of loan portfolio	14,855	14,595
Home Equity Lines Of Credit [Member] | Substandard [Member]
Financing Receivable Recorded Investment [Line Items]
Total risk category of loan portfolio	184	413
Construction And Land [Member]
Financing Receivable Recorded Investment [Line Items]
Total risk category of loan portfolio	7,896	12,623
Construction And Land [Member] | Pass [Member]
Financing Receivable Recorded Investment [Line Items]
Total risk category of loan portfolio	$ 7,896	$ 12,623

Fixed Assets (Summary Of Fixed

Fixed Assets (Summary Of Fixed Assets) (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Property Plant And Equipment [Abstract]
Furniture and equipment	$ 201,917	$ 254,705
Building and leasehold improvements	192,320	160,369
Property on operating leases		21,064
Fixed assets, gross	394,237	436,138
Less accumulated depreciation and amortization	(239,117)	(263,310)
Fixed assets, net	$ 155,120	$ 172,828

Fixed Assets (Narrative) (Detai

Fixed Assets (Narrative) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Property Plant And Equipment [Abstract]
Depreciation and amortization	$ 32,495	$ 43,147	$ 36,715

Goodwill And Intangible Asset89

Goodwill And Intangible Assets (Carrying Amount Of Goodwill And Intangible Assets) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Schedule of Goodwill and Intangible Assets [Line Items]
Goodwill, Beginning balance	$ 962,282
Goodwill, Net Additions	6,552
Goodwill, Ending balance	968,834	$ 962,282
Intangible assets, Beginning balance	116,304
Intangible assets, Net Additions	5,458
Intangible assets, Amortization	(12,135)	(14,427)	$ (10,423)
Intangible assets, Ending balance	109,627	116,304
Global Wealth Management [Member]
Schedule of Goodwill and Intangible Assets [Line Items]
Goodwill, Beginning balance	270,779
Goodwill, Net Additions	5,698
Goodwill, Ending balance	276,477	270,779
Intangible assets, Beginning balance	45,231
Intangible assets, Net Additions	3,800
Intangible assets, Amortization	(4,506)
Intangible assets, Ending balance	44,525	45,231
Institutional Group [Member]
Schedule of Goodwill and Intangible Assets [Line Items]
Goodwill, Beginning balance	691,503
Goodwill, Net Additions	854
Goodwill, Ending balance	692,357	691,503
Intangible assets, Beginning balance	71,073
Intangible assets, Net Additions	1,658
Intangible assets, Amortization	(7,629)
Intangible assets, Ending balance	$ 65,102	$ 71,073

Goodwill And Intangible Asset90

Goodwill And Intangible Assets (Intangible Assets Subject To Amortization) (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Value	$ 175,716	$ 170,257
Accumulated Amortization	68,207	56,071
Customer Relationships [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Value	146,986	141,621
Accumulated Amortization	55,809	46,209
Trade Name [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Value	24,713	24,713
Accumulated Amortization	10,228	8,670
Investment Banking Backlog [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Value	2,598	1,345
Accumulated Amortization	1,202	379
Non-Compete Agreements [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Value	1,419	2,578
Accumulated Amortization	$ 968	$ 813

Goodwill And Intangible Asset91

Goodwill And Intangible Assets (Narrative) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Schedule of Goodwill and Intangible Assets [Line Items]
Amortization of intangible assets	$ 12,135	$ 14,427	$ 10,423
Customer Relationships [Member]
Schedule of Goodwill and Intangible Assets [Line Items]
Weighted-average remaining lives of intangible assets	10 years 9 months 18 days
Trade Name [Member]
Schedule of Goodwill and Intangible Assets [Line Items]
Weighted-average remaining lives of intangible assets	10 years 7 months 6 days
Non-Compete Agreements [Member]
Schedule of Goodwill and Intangible Assets [Line Items]
Weighted-average remaining lives of intangible assets	9 years 7 months 6 days

Goodwill And Intangible Asset92

Goodwill And Intangible Assets (Amortization Expense In Future Periods) (Details) $ in Thousands	Dec. 31, 2017USD ($)
Goodwill And Intangible Assets Disclosure [Abstract]
2,018	$ 10,890
2,019	10,341
2,020	10,124
2,021	9,622
2,022	8,880
Thereafter	57,652
Future amortization expense total	$ 107,509

Borrowings and Federal Home L93

Borrowings and Federal Home Loan Bank Advances (Narrative) (Details)	12 Months Ended
	Dec. 31, 2017USD ($)item	Dec. 31, 2016USD ($)
Short Term Debt [Line Items]
Uncommitted secured lines of credit	$ 1,000,000,000
Number of banks | item	6
Daily borrowings under our uncommitted secured lines	$ 444,400,000
Compensating balances	0
Trading securities pledged	2,000,000,000	$ 1,700,000,000
Federal home loan advances, floating-rate	745,000,000
Revolving Credit Facility
Short Term Debt [Line Items]
Committed revolving credit facility	$ 200,000,000
Revolving credit facility expiration date	2020-03
LIBOR rate	2.00%
Outstanding on our revolving credit facility	$ 0
Company Owned Securities [Member]
Short Term Debt [Line Items]
Uncommitted secured lines of credit	256,000,000
Trading securities pledged	$ 292,700,000
Federal Home Loan Bank advances [Member]
Short Term Debt [Line Items]
Weighted average interest rate on borrowings	1.07%

Senior Notes (Summary of Senior

Senior Notes (Summary of Senior Notes) (Details) - USD ($) $ in Thousands		Dec. 31, 2017	Oct. 04, 2017	Dec. 31, 2016	Dec. 31, 2015	Jul. 31, 2014
Debt Instrument [Line Items]
Long-term Debt, gross		$ 1,025,000		$ 800,000
Debt issuance costs, net		(10,060)		(4,109)
Long-term Debt		1,014,940		795,891
Senior notes 4.250% due 2024 [Member]
Debt Instrument [Line Items]
Long-term Debt, gross	[1]	500,000		500,000
Long-term Debt						$ 300,000
Senior notes 3.50% due 2020 [Member]
Debt Instrument [Line Items]
Long-term Debt, gross	[2]	300,000		$ 300,000
Long-term Debt					$ 300,000
Senior notes 5.20% due 2047 [Member]
Debt Instrument [Line Items]
Long-term Debt, gross	[3]	$ 225,000
Long-term Debt			$ 200,000
[1]	In July 2014, we sold in a registered underwritten public offering, $300.0 million in aggregate principal amount of 4.250% senior notes due July 2024. Interest on these senior notes is payable semi-annually in arrears. We may redeem the notes in whole or in part, at our option, at a redemption price equal to 100% of their principal amount, plus a “make-whole” premium and accrued and unpaid interest, if any, to the date of redemption. In July 2016, we issued an additional $200.0 million in aggregate principal amount of 4.25% senior notes due 2024.
[2]	In December 2015, we sold in a registered underwritten public offering, $300.0 million in aggregate principal amount of 3.50% senior notes due December 2020. Interest on these senior notes is payable semi-annually in arrears. We may redeem the notes in whole or in part, at our option, at a redemption price equal to 100% of their principal amount, plus a “make-whole” premium and accrued and unpaid interest, if any, to the date of redemption.
[3]	On October 4, 2017, we completed the pricing of a registered underwritten public offering of $200.0 million in aggregate principal amount of 5.20% senior notes due October 2047. Interest on the senior notes is payable quarterly in arrears on January 15, April 15, July 15, and October 15. On or after October 15, 2022, we may redeem some or all of the senior notes at any time at a redemption price equal to 100% of the principal amount of the notes being redeemed plus accrued interest thereon to the redemption date. On October 27, 2017, we completed the sale of an additional $25.0 million aggregate principal amount of Notes pursuant to the over-allotment option.

Senior Notes (Summary of Seni95

Senior Notes (Summary of Senior Notes) (Parenthetical) (Details) - USD ($) $ in Thousands	1 Months Ended		12 Months Ended
	Oct. 27, 2017	Jul. 31, 2016	Dec. 31, 2017	Oct. 04, 2017	Dec. 31, 2016	Dec. 31, 2015	Jul. 31, 2014
Debt Instrument [Line Items]
Stated interest rate			4.25%
Long-term Debt			$ 1,014,940		$ 795,891
Debt instrument, maturity date			Dec. 31, 2024
Senior notes 4.250% due 2024 [Member]
Debt Instrument [Line Items]
Stated interest rate			4.25%				4.25%
Long-term Debt							$ 300,000
Debt instrument, maturity date			Jul. 31, 2024
Redemption price, percentage of principal amount			100.00%
Additional issuance of long-term debt		$ 200,000
Senior notes 3.50% due 2020 [Member]
Debt Instrument [Line Items]
Stated interest rate			3.50%			3.50%
Long-term Debt						$ 300,000
Debt instrument, maturity date			Dec. 31, 2020
Redemption price, percentage of principal amount			100.00%
Senior notes 5.20% due 2047 [Member]
Debt Instrument [Line Items]
Stated interest rate			5.20%	5.20%
Long-term Debt				$ 200,000
Debt instrument, maturity date			Oct. 31, 2047
Redemption price, percentage of principal amount			100.00%
Additional issuance of long-term debt	$ 25,000

Senior Notes (Schedule Of Corpo

Senior Notes (Schedule Of Corporate Debt Principal Maturities) (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Debt Instrument [Line Items]
Long-term Debt	$ 1,014,940	$ 795,891
Non Recourse Debt [Member]
Debt Instrument [Line Items]
2,020	300,000
Thereafter	725,000
Long-term Debt	$ 1,025,000

Bank Deposits (Schedule Of Depo

Bank Deposits (Schedule Of Deposits) (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Deposits Liabilities Balance Sheet Reported Amounts [Abstract]
Money market and savings accounts	$ 13,219,675	$ 11,264,285
Demand deposits (interest-bearing)	184,829	253,545
Demand deposits (non-interest-bearing)	5,856	5,752
Certificates of deposit	1,575	3,901
Bank deposits	$ 13,411,935	$ 11,527,483

Bank Deposits (Narrative) (Deta

Bank Deposits (Narrative) (Details) - USD ($) $ in Millions	Dec. 31, 2017	Dec. 31, 2016
Bank Deposits [Line Items]
Weighted average interest rate on deposits	0.10%	0.09%
Brokerage Customers Deposits [Member]
Bank Deposits [Line Items]
Deposits of related parties	$ 13,400	$ 11,500
Stifel Nicolaus [Member]
Bank Deposits [Line Items]
Interest bearing and time deposits of executive officers, directors, and affiliates	$ 0.2	$ 0.5

Derivative Instruments And He99

Derivative Instruments And Hedging Activities (Schedule Of Notional Values And Fair Values Of Derivative Instruments) (Details) - Cash Flow Interest Rate Contracts [Member] - Designated As Hedging Instrument [Member] - USD ($)	Dec. 31, 2017	Dec. 31, 2016
Derivatives, Fair Value [Line Items]
Asset Derivatives, Notional Value	$ 540,000,000	$ 790,000,000
Liability Derivatives, Notional Value		121,442,000
Other Assets [Member]
Derivatives, Fair Value [Line Items]
Asset Derivatives, Fair Value	$ 7,995,000	10,390,000
Accounts Payable and Accrued Expenses [Member]
Derivatives, Fair Value [Line Items]
Liability Derivatives, Fair Value		$ 1,823,000

Derivative Instruments And H100

Derivative Instruments And Hedging Activities (Narrative) (Details) $ in Millions	12 Months Ended
	Dec. 31, 2017USD ($)
General Discussion Of Derivative Instruments And Hedging Activities [Abstract]
Average remaining life of interest rate swap agreements	2 years 1 month 6 days
Estimated derivatives to be reclassified as increase to interest expense	$ 3.2
Derivative counterparty posted collateral against obligation	$ 0.8

Derivative Instruments And H101

Derivative Instruments And Hedging Activities (Schedule Of Derivative Instruments In Consolidated Statements Of Operations) (Details) - Cash Flow Interest Rate Contracts [Member] - Interest Expense [Member] - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Derivative Instruments, Gain (Loss) [Line Items]
Gain/(Loss) Recognized in OCI (Effectiveness)	$ 1,085	$ 6,383	$ (2,137)
Loss Reclassified From OCI Into Income	$ 635	5,444	$ 3,824
Loss Recognized Due to Ineffectiveness		$ 30

Debentures To Stifel Financi102

Debentures To Stifel Financial Capital Trusts (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017		Dec. 31, 2016		Jun. 28, 2008	Mar. 30, 2007	Aug. 12, 2005
Debt Instrument [Line Items]
Debenture to Stifel Financial Capital Trust	$ 67,500		$ 67,500
Stated interest rate	4.25%
Maturity date	Dec. 31, 2024
Stifel Financial Capital Trust II [Member]
Debt Instrument [Line Items]
Debenture to Stifel Financial Capital Trust	$ 20,000	[1]	20,000	[1]			$ 35,000
Stated interest rate	6.38%
Maturity date	Sep. 30, 2035
Earliest call date	Sep. 30, 2010
Interest rate terms, spread over reference rate	1.70%
Reference rate	Three-month LIBOR plus 1.70% per annum
Extinguishment of debentures			15,000
Stifel Financial Capital Trust III [Member]
Debt Instrument [Line Items]
Debenture to Stifel Financial Capital Trust	$ 35,000	[2]	35,000	[2]		$ 35,000
Stated interest rate	6.79%
Maturity date	Jun. 6, 2037
Earliest call date	Jun. 6, 2012
Interest rate terms, spread over reference rate	1.85%
Reference rate	Three-month LIBOR plus 1.85% per annum
Stifel Financial Capital Trust IV [Member]
Debt Instrument [Line Items]
Debenture to Stifel Financial Capital Trust	$ 12,500	[3]	$ 12,500	[3]	$ 35,000
Stated interest rate	6.78%
Maturity date	Sep. 6, 2037
Earliest call date	Sep. 6, 2012
Interest rate terms, spread over reference rate	1.85%
Reference rate	Three-month LIBOR plus 1.85% per annum
[1]	On August 12, 2005, we completed a private placement of $35.0 million of 6.38% Cumulative Trust Preferred Securities. The trust preferred securities were offered by Stifel Financial Capital Trust II (the “Trust II”), a non-consolidated wholly owned subsidiary of our company. The trust preferred securities mature on September 30, 2035, but may be redeemed by our company, and in turn, the Trust II would call the debenture beginning September 30, 2010. The Trust II requires quarterly distributions of interest to the holders of the trust preferred securities. Distributions are payable at a floating interest rate equal to three-month LIBOR plus 1.70% per annum. During 2016, we extinguished $15.0 million of the Trust II debentures.
[2]	On March 30, 2007, we completed a private placement of $35.0 million of 6.79% Cumulative Trust Preferred Securities. The trust preferred securities were offered by Stifel Financial Capital Trust III (the “Trust III”), a non-consolidated wholly owned subsidiary of our company. The trust preferred securities mature on June 6, 2037, but may be redeemed by our company, and in turn, Trust III would call the debenture beginning June 6, 2012. Trust III requires quarterly distributions of interest to the holders of the trust preferred securities. Distributions are payable at a floating interest rate equal to three-month LIBOR plus 1.85% per annum.
[3]	On June 28, 2007, we completed a private placement of $35.0 million of 6.78% Cumulative Trust Preferred Securities. The trust preferred securities were offered by Stifel Financial Capital Trust IV (the “Trust IV”), a non-consolidated wholly owned subsidiary of our company. The trust preferred securities mature on September 6, 2037, but may be redeemed by our company, and in turn, Trust IV would call the debenture beginning September 6, 2012. Trust IV requires quarterly distributions of interest to the holders of the trust preferred securities. Distributions are payable at a floating interest rate equal to three-month LIBOR plus 1.85% per annum.

Disclosures About Offsetting103

Disclosures About Offsetting Assets And Liabilities (Financial Assets And Derivative Assets That Are Subject To Offset) (Details) - USD ($) $ in Thousands		Dec. 31, 2017	Dec. 31, 2016
Offsetting [Abstract]
Gross amounts of recognized assets, Securities borrowing	[1]	$ 132,776	$ 382,691
Net amounts presented in the Statement of Financial Condition, Securities borrowing	[1]	132,776	382,691
Gross amounts not offset in the Statement of Financial Position, Financial instruments, Securities borrowing	[1]	(78,474)	(291,793)
Gross amounts not offset in the Statement of Financial Position, Collateral received, Securities borrowing	[1]	(37,248)	(68,776)
Securities borrowed, Net amount	[1]	17,054	22,122
Gross amounts of recognized assets, Reverse repurchase agreements	[2]	512,220	248,588
Net amounts presented in the Statement of Financial Condition, Securities purchased under agreements to resell	[2]	512,220	248,588
Gross amounts not offset in the Statement of Financial Position, Financial instruments, Securities purchased under agreements to resell	[2]	(233,624)	(216,542)
Gross amounts not offset in the Statement of Financial Position, Collateral received, Securities purchased under agreements to resell	[2]	(266,008)	(32,046)
Securities purchased under agreements to resell, Net amount	[2]	12,588
Gross amounts of recognized assets, Cash flow interest rate contracts		7,995	10,390
Net amounts presented in the Statement of Financial Condition, Cash flow interest rate contracts		7,995	10,390
Cash flow interest rate contracts, Net amount		7,995	10,390
Gross amounts of recognized assets		652,991	641,669
Net amounts presented in the Statements of Financial Condition		652,991	641,669
Gross amounts not offset in the Statement of Financial Position		(312,098)	(508,335)
Gross amounts not offset in the Statement of Financial Position, Collateral received		(303,256)	(100,822)
Net amount		$ 37,637	$ 32,512
[1]	Securities borrowing transactions are included in receivables from brokers, dealers, and clearing organizations on the consolidated statements of financial condition. See Note 4 in the notes to consolidated financial statements for additional information on receivables from brokers, dealers, and clearing organizations.
[2]	Collateral received includes securities received by our company from the counterparty. These securities are not included on the consolidated statements of financial condition unless there is an event of default. The fair value of securities pledged as collateral was $509.4 million and $248.5 million at December 31, 2017 and 2016, respectively.

Disclosures About Offsetting104

Disclosures About Offsetting Assets And Liabilities (Financial Assets And Derivative Assets That Are Subject To Offset) (Details) (Parenthetical) - USD ($) $ in Thousands		Dec. 31, 2017	Dec. 31, 2016
Offsetting Assets [Line Items]
Fair value of securities pledged as collateral	[1]	$ 266,008	$ 32,046
Securities Pledged As Collateral [Member]
Offsetting Assets [Line Items]
Fair value of securities pledged as collateral		$ 509,400	$ 248,500
[1]	Collateral received includes securities received by our company from the counterparty. These securities are not included on the consolidated statements of financial condition unless there is an event of default. The fair value of securities pledged as collateral was $509.4 million and $248.5 million at December 31, 2017 and 2016, respectively.

Disclosures About Offsetting105

Disclosures About Offsetting Assets And Liabilities (Financial Liabilities And Derivative Liabilities That Are Subject To Offset) (Details) - USD ($) $ in Thousands		Dec. 31, 2017	Dec. 31, 2016
Offsetting [Abstract]
Gross amounts of recognized liabilities, Securities lending	[1]	$ (219,782)	$ (478,814)
Net amounts presented in the Statement of Financial Condition, Securities lending	[1]	(219,782)	(478,814)
Gross amounts not offset in the Statement of Financial Position, Financial instruments, Securities lending	[1]	78,474	291,793
Gross amounts not offset in the Statement of Financial Position, Collateral pledged, Securities lending	[1]	133,772	175,849
Securities lending, Net amount	[1]	(7,536)	(11,172)
Gross amounts of recognized liabilities, Securities purchased under agreements to resell	[2]	(233,704)	(268,546)
Net amounts presented in the Statement of Financial Condition, Securities purchased under agreements to resell	[2]	(233,704)	(268,546)
Gross amounts not offset in the Statement of Financial Position, Financial instruments, Securities purchased under agreements to resell	[2]	233,624	216,542
Gross amounts not offset in the Statement of Financial Position, Collateral pledged, Securities purchased under agreements to resell	[2]	80	52,004
Gross amount of recognized liabilities, Cash flow interest rate contracts			(1,823)
Net amounts presented in the Statement of Financial Condition, Cash flow interest rate contracts			(1,823)
Gross amounts not offset in the Statement of Financial Position, Collateral pledged, Cash flow interest rate contracts			1,823
Gross amounts of recognized liabilities		(453,486)	(749,183)
Net amounts presented in the Statement of Financial Condition		(453,486)	(749,183)
Gross amounts not offset in the Statement of Financial Position, Financial instruments		312,098	508,335
Gross amounts not offset in the Statement of Financial Condition, Collateral pledged		133,852	229,676
Net amount		$ (7,536)	$ (11,172)
[1]	Securities lending transactions are included in payables to brokers, dealers, and clearing organizations on the consolidated statements of financial condition. See Note 4 in the notes to consolidated financial statements for additional information on payables to brokers, dealers, and clearing organizations.
[2]	Collateral pledged includes the fair value of securities pledged by our company to the counter party. These securities are included on the consolidated statements of financial condition unless we default. Collateral pledged by our company to the counter party includes U.S. government agency securities, U.S. government securities, and corporate fixed income securities with market values of $241.4 million and $299.3 million at December 31, 2017 and 2016, respectively.

Disclosures About Offsetting106

Disclosures About Offsetting Assets And Liabilities (Financial Liabilities And Derivative Liabilities That Are Subject To Offset) (Details) (Parenthetical) - USD ($) $ in Thousands		Dec. 31, 2017	Dec. 31, 2016
Offsetting Liabilities [Line Items]
Fair value of securities pledged as collateral to counter party	[1]	$ 80	$ 52,004
U.S. Government Agency Securities And U.S. Government Securities And Corporate Fixed Income Securities [Member] | Securities Pledged As Collateral [Member]
Offsetting Liabilities [Line Items]
Fair value of securities pledged as collateral to counter party		$ 241,400	$ 299,300
[1]	Collateral pledged includes the fair value of securities pledged by our company to the counter party. These securities are included on the consolidated statements of financial condition unless we default. Collateral pledged by our company to the counter party includes U.S. government agency securities, U.S. government securities, and corporate fixed income securities with market values of $241.4 million and $299.3 million at December 31, 2017 and 2016, respectively.

Commitments, Guarantees, And107

Commitments, Guarantees, And Contingencies (Narrative) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Commitments And Contingencies Disclosure [Abstract]
Outstanding committed capital to certain entities	$ 3.2
Rent expense	$ 104.5	$ 108.7	$ 93.6

Commitments, Guarantees, And108

Commitments, Guarantees, And Contingencies (Future Minimum Commitments Under Non-Cancelable Operating Leases) (Details) $ in Thousands	Dec. 31, 2017USD ($)
Commitments And Contingencies Disclosure [Abstract]
2,018	$ 96,009
2,019	90,763
2,020	77,186
2,021	60,279
2,022	52,732
Thereafter	151,548
Future minimum commitments under non-cancelable operating leases	$ 528,517

Legal Proceedings (Narrative) (

Legal Proceedings (Narrative) (Details) $ in Millions	12 Months Ended
	Dec. 31, 2017USD ($)
Stone & Youngberg [Member]
Loss Contingencies [Line Items]
Loss contingency, damages sought, value	$ 200
CA Funds [Member]
Loss Contingencies [Line Items]
Loss contingency, damages sought, value	$ 90
Loss contingency, damages sought	In a related action, approximately one dozen individual investors (the “individual plaintiffs”) brought a direct action against the Company and other defendants, seeking recessionary damages of approximately $90 million.
Loss contingency, actions taken by court	The court ruled that the individual plaintiffs had no standing to pursue these claims because the CA funds are separately pursuing claims.

Regulatory Capital Requireme110

Regulatory Capital Requirements (Narrative) (Details) $ in Millions	Dec. 31, 2017USD ($)
Stifel Financial Corp. [Member]
Compliance With Regulatory Capital Requirements Under Banking Regulations [Line Items]
Net capital under the alternative method	$ 1
Aggregate debit balances	2.00%
Our Other Broker-Dealer Subsidiaries
Compliance With Regulatory Capital Requirements Under Banking Regulations [Line Items]
Ratio of indebtedness to net capital	15
Stifel Nicolaus [Member]
Compliance With Regulatory Capital Requirements Under Banking Regulations [Line Items]
Aggregate debit balances	18.60%
Net capital	$ 273
Excess of minimum required net capital	$ 243.6

Regulatory Capital Requireme111

Regulatory Capital Requirements (Schedule Of Total Risk-Based, Tier 1 Risk-Based, And Tier 1 Leverage Ratios) (Details) $ in Thousands	Dec. 31, 2017USD ($)
Stifel Bank [Member]
Compliance With Regulatory Capital Requirements Under Banking Regulations [Line Items]
Tier 1 capital, Actual Amount	$ 1,056,211
Tier 1 capital, Actual Ratio	14.30%
Tier 1 capital For Capital Adequacy Purposes, Amount	$ 441,930
Tier 1 capital For Capital Adequacy Purposes, Ratio	6.00%
Tier 1 capital To Be Well Capitalized Under Prompt Corrective Action Provisions, Amount	$ 589,240
Tier 1 To Be Well Capitalized Under Prompt Corrective Action Provisions, Ratio	8.00%
Total capital, Actual Amount	$ 1,124,452
Total capital, Actual Ratio	15.30%
Total capital For Capital Adequacy Purposes, Amount	$ 589,240
Total capital For Capital Adequacy Purposes, Ratio	8.00%
Total capital To Be Well Capitalized Under Prompt Corrective Action Provisions, Amount	$ 736,550
Total capital To Be Well Capitalized Under Prompt Corrective Action Provisions, Ratio	10.00%
Tier 1 leverage, Actual Amount	$ 1,056,211
Tier 1 leverage, Actual Ratio	7.10%
Tier 1 leverage For Capital Adequacy Purposes, Amount	$ 595,872
Tier 1 leverage For Capital Adequacy Purposes, Ratio	4.00%
Tier 1 leverage To Be Well Capitalized Under Prompt Corrective Action Provisions, Amount	$ 744,840
Tier 1 leverage To Be Well Capitalized Under Prompt Corrective Action Provisions, Ratio	5.00%
Stifel Financial Corp. [Member]
Compliance With Regulatory Capital Requirements Under Banking Regulations [Line Items]
Tier 1 capital, Actual Amount	$ 1,899,162
Tier 1 capital, Actual Ratio	19.00%
Tier 1 capital For Capital Adequacy Purposes, Amount	$ 601,011
Tier 1 capital For Capital Adequacy Purposes, Ratio	6.00%
Tier 1 capital To Be Well Capitalized Under Prompt Corrective Action Provisions, Amount	$ 801,347
Tier 1 To Be Well Capitalized Under Prompt Corrective Action Provisions, Ratio	8.00%
Total capital, Actual Amount	$ 1,966,634
Total capital, Actual Ratio	19.60%
Total capital For Capital Adequacy Purposes, Amount	$ 801,347
Total capital For Capital Adequacy Purposes, Ratio	8.00%
Total capital To Be Well Capitalized Under Prompt Corrective Action Provisions, Amount	$ 1,001,684
Total capital To Be Well Capitalized Under Prompt Corrective Action Provisions, Ratio	10.00%
Tier 1 leverage, Actual Amount	$ 1,899,162
Tier 1 leverage, Actual Ratio	9.50%
Tier 1 leverage For Capital Adequacy Purposes, Amount	$ 795,679
Tier 1 leverage For Capital Adequacy Purposes, Ratio	4.00%
Tier 1 leverage To Be Well Capitalized Under Prompt Corrective Action Provisions, Amount	$ 994,599
Tier 1 leverage To Be Well Capitalized Under Prompt Corrective Action Provisions, Ratio	5.00%
Common Stock [Member] | Stifel Bank [Member]
Compliance With Regulatory Capital Requirements Under Banking Regulations [Line Items]
Tier 1 capital, Actual Amount	$ 1,056,211
Tier 1 capital, Actual Ratio	14.30%
Tier 1 capital For Capital Adequacy Purposes, Amount	$ 331,447
Tier 1 capital For Capital Adequacy Purposes, Ratio	4.50%
Tier 1 capital To Be Well Capitalized Under Prompt Corrective Action Provisions, Amount	$ 478,757
Tier 1 To Be Well Capitalized Under Prompt Corrective Action Provisions, Ratio	6.50%
Common Stock [Member] | Stifel Financial Corp. [Member]
Compliance With Regulatory Capital Requirements Under Banking Regulations [Line Items]
Tier 1 capital, Actual Amount	$ 1,689,291
Tier 1 capital, Actual Ratio	16.90%
Tier 1 capital For Capital Adequacy Purposes, Amount	$ 450,758
Tier 1 capital For Capital Adequacy Purposes, Ratio	4.50%
Tier 1 capital To Be Well Capitalized Under Prompt Corrective Action Provisions, Amount	$ 651,095
Tier 1 To Be Well Capitalized Under Prompt Corrective Action Provisions, Ratio	6.50%

Interest Income And Interest112

Interest Income And Interest Expense (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Interest Income Expense Net [Abstract]
Bank loans, net of unearned income									$ 206,084	$ 131,808	$ 79,816
Investment securities									189,472	108,992	53,787
Margin balances									37,218	32,147	22,421
Inventory									17,563	18,965	17,757
Other									4,044	2,420	5,320
Total interest income									454,381	294,332	179,101
Senior notes									35,338	36,217	25,695
Bank deposits									12,661	7,331	7,262
Federal Home Loan Bank advances									8,305	6,777	551
Other									13,726	16,549	11,891
Total interest expense	$ 19,865	$ 17,625	$ 16,644	$ 15,896	$ 16,118	$ 19,383	$ 17,262	$ 14,111	$ 70,030	$ 66,874	$ 45,399

Employee Incentive, Deferred113

Employee Incentive, Deferred Compensation, And Retirement Plans (Details) - USD ($) $ / shares in Units, $ in Thousands

1 Months Ended

3 Months Ended

12 Months Ended

Dec. 31, 2017

Dec. 31, 2017

Sep. 30, 2017

Jun. 30, 2017

Mar. 31, 2017

Dec. 31, 2016

Sep. 30, 2016

Jun. 30, 2016

Mar. 31, 2016

Dec. 31, 2017

Dec. 31, 2016

Dec. 31, 2015

Share-based Compensation Arrangement by Share-based Payment Award [Line Items]

Shares authorized to grant

6,700,000

Stock-based compensation

$ 140,461

$ 186,303

$ 165,641

Provision for income tax expense (benefit)

$ 1,168

$ 41,603

$ 30,387

$ 13,507

$ 28,014

$ 10,168

$ 6,022

$ 16,858

86,665

61,062

49,231

Restricted stock units, charges at the date of modification

$ 55,900

Vesting of outstanding debenture awards

$ 51,400

Options granted during the period

0

Options outstanding during the period

11,934

11,934

11,934

Weighted average exercise price

$ 29.33

$ 29.33

$ 29.33

Contributions to the Profit Sharing Plan

$ 7,100

6,500

7,700

Incentive Stock Award Plans [Member]

Share-based Compensation Arrangement by Share-based Payment Award [Line Items]

Stock-based compensation

246,700

190,100

142,100

Incentive Stock Award Plans [Member] | ASU No. 2016-09 [Member]

Share-based Compensation Arrangement by Share-based Payment Award [Line Items]

Provision for income tax expense (benefit)

$ (64,700)

4,900

$ (14,700)

Restricted Stock Units (RSUs) [Member]

Share-based Compensation Arrangement by Share-based Payment Award [Line Items]

Restricted stock units, charges at the date of modification

58,600

Common stock issued for acquisitions

$ 23,800

Restricted Stock Units and Restricted Stock Awards [Member]

Share-based Compensation Arrangement by Share-based Payment Award [Line Items]

Total number of stock awards outstanding

16,500,000

16,500,000

16,500,000

Unvested stock awards outstanding

12,279,000

12,279,000

16,276,000

12,279,000

16,276,000

Unrecognized compensation expense related to non-vested options

$ 251,300

$ 251,300

$ 251,300

Weighted-average period, compensation cost expected to recognized, in years

3 years 1 month 6 days

Fair value of stock awards vested

$ 185,800

Performance-based Restricted Stock Units [Member]

Share-based Compensation Arrangement by Share-based Payment Award [Line Items]

Awards vesting period in years

5 years

Award performance period

4 years

Total number of stock awards outstanding

600,000

600,000

600,000

Unvested stock awards outstanding

600,000

600,000

600,000

SWAP Plan [Member]

Share-based Compensation Arrangement by Share-based Payment Award [Line Items]

Elective deferrals vested percentage

100.00%

100.00%

100.00%

Percentage of earnings deferred into company stock units

5.00%

5.00%

5.00%

Percentage of earnings deferred into company stock units, Company match

25.00%

25.00%

25.00%

Percentage of earnings deferred into company stock units, Additional elective deferral

1.00%

Minimum [Member] | Deferred Compensation Plans [Member]

Share-based Compensation Arrangement by Share-based Payment Award [Line Items]

Awards vesting period in years

1 year

Minimum [Member] | Incentive Stock Award Plans [Member]

Share-based Compensation Arrangement by Share-based Payment Award [Line Items]

Awards vesting period in years

1 year

Minimum [Member] | Restricted Stock Units (RSUs) [Member]

Share-based Compensation Arrangement by Share-based Payment Award [Line Items]

Awards vesting period in years

1 year

Minimum [Member] | Restricted Stock Awards [Member]

Share-based Compensation Arrangement by Share-based Payment Award [Line Items]

Awards vesting period in years

1 year

Minimum [Member] | Performance-based Restricted Stock Units [Member]

Share-based Compensation Arrangement by Share-based Payment Award [Line Items]

Potential percentage of converted shares

0.00%

Minimum [Member] | SWAP Plan [Member]

Share-based Compensation Arrangement by Share-based Payment Award [Line Items]

Awards vesting period in years

1 year

Maximum [Member] | Deferred Compensation Plans [Member]

Share-based Compensation Arrangement by Share-based Payment Award [Line Items]

Awards vesting period in years

8 years

Maximum [Member] | Incentive Stock Award Plans [Member]

Share-based Compensation Arrangement by Share-based Payment Award [Line Items]

Awards vesting period in years

10 years

Maximum [Member] | Restricted Stock Units (RSUs) [Member]

Share-based Compensation Arrangement by Share-based Payment Award [Line Items]

Awards vesting period in years

10 years

Maximum [Member] | Restricted Stock Awards [Member]

Share-based Compensation Arrangement by Share-based Payment Award [Line Items]

Awards vesting period in years

5 years

Maximum [Member] | Performance-based Restricted Stock Units [Member]

Share-based Compensation Arrangement by Share-based Payment Award [Line Items]

Potential percentage of converted shares

200.00%

Maximum [Member] | SWAP Plan [Member]

Share-based Compensation Arrangement by Share-based Payment Award [Line Items]

Awards vesting period in years

10 years

Employee Incentive, Deferred114

Employee Incentive, Deferred Compensation, And Retirement Plans (Schedule Of Unvested Restricted Stock Award Roll Forward) (Details) - Restricted Stock Units and Restricted Stock Awards [Member] shares in Thousands	12 Months Ended
	Dec. 31, 2017$ / sharesshares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unvested, Beginning balance | shares	16,276
Granted | shares	1,422
Vested | shares	(1,875)
Converted to restricted stock | shares	(3,111)
Cancelled | shares	(433)
Unvested, Ending balance | shares	12,279
Unvested, Weighted-average grant date fair value, Beginning balance | $ / shares	$ 39.40
Granted, Weighted-average grant date fair value | $ / shares	51.24
Vested | $ / shares	33.59
Converted to restricted stock | $ / shares	39.49
Cancelled, Weighted-average grant date fair value | $ / shares	33.93
Unvested, Weighted-average grant date fair value, Ending balance | $ / shares	$ 42.17

Off-Balance Sheet Credit Risk (

Off-Balance Sheet Credit Risk (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Fair Value Off Balance Sheet Risks Disclosure Information [Line Items]
General settlement period of securities transactions	2 days
Fair value of securities accepted as collateral permitted to sell or repledge	$ 2,400	$ 2,500
Fair value of collateral securities sold or repledged	233.7	268.5
Outstanding commitments to originate loans	160.2	205.8
Letters of credit outstanding	82.5	88.9
Unused Lines Of Credit [Member]
Fair Value Off Balance Sheet Risks Disclosure Information [Line Items]
Unused lines of credit to commercial and consumer borrowers	$ 590.5	$ 492.5
Standby Letters of Credit [Member] | Maximum [Member]
Fair Value Off Balance Sheet Risks Disclosure Information [Line Items]
Letters of credit, expiration period	1 year

Income Taxes (Provision For Inc

Income Taxes (Provision For Income Taxes/(Benefit)) (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Components Of Income Tax Expense Benefit Continuing Operations [Abstract]
Current taxes: Federal									$ (29,396)	$ 7,927	$ 43,962
Current taxes: State									(334)	5,818	9,672
Current taxes: Foreign									(1,734)	1,255	1,329
Current taxes: Total									(31,464)	15,000	54,963
Deferred taxes: Federal									114,842	39,127	(9,396)
Deferred taxes: State									1,728	6,261	3,056
Deferred taxes: Foreign									1,559	674	608
Deferred Income Tax Expense (Benefit), Total									118,129	46,062	(5,732)
Provision for income taxes	$ 1,168	$ 41,603	$ 30,387	$ 13,507	$ 28,014	$ 10,168	$ 6,022	$ 16,858	$ 86,665	$ 61,062	$ 49,231

Income Taxes (Reconciliation Of

Income Taxes (Reconciliation Of The Statutory Federal Income Tax With The Company's Effective Tax Rate) (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Components Of Income Tax Expense Benefit Continuing Operations [Abstract]
Statutory rate									$ 94,338	$ 49,904	$ 49,548
State income taxes, net of federal income tax									6,721	7,688	7,908
Investment in subsidiary											(4,800)
Change in uncertain tax position									1,544	41	(3,903)
Non-deductible litigation expense										7,700
Foreign tax rate difference									(412)	(1,810)	(106)
Excess tax benefit from stock-based compensation									(57,431)
Revaluation of deferred tax assets	$ 42,400								42,443
Other, net									(538)	(2,461)	584
Provision for income taxes	$ 1,168	$ 41,603	$ 30,387	$ 13,507	$ 28,014	$ 10,168	$ 6,022	$ 16,858	$ 86,665	$ 61,062	$ 49,231

Income Taxes (Deferred Tax Asse

Income Taxes (Deferred Tax Assets And Liabilities) (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Components Of Income Tax Expense Benefit Continuing Operations [Abstract]
Deferred compensation	$ 71,687	$ 181,575
Accrued expenses	33,957	35,443
Net operating loss carryforwards	31,986	40,266
Receivable reserves	22,679	22,870
Depreciation	4,012	12,550
Total deferred tax assets	164,321	292,704
Valuation allowance	(4,285)	(8,768)
Deferred tax assets	160,036	283,936
Goodwill and other intangibles	(38,982)	(49,481)
Unrealized gain on investments	(11,081)	(1,459)
Prepaid expenses	(2,834)	(4,557)
Other	(1,987)	(2,986)
Total deferred tax liabilities	(54,884)	(58,483)
Net deferred tax asset	$ 105,152	$ 225,453

Income Taxes (Narrative) (Detai

Income Taxes (Narrative) (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Income Tax [Line Items]
Corporate tax rate			35.00%
Re-measurement of deferred tax assets and liabilities	$ 42,400		$ 42,443
Net operating loss carryforward	334,300		334,300
Valuation allowance decrease			4,500
Deferred tax assets, net	105,152		105,152	$ 225,453
Unrecognized tax benefits	3,180		3,180	1,800	$ 2,717	$ 5,510
Unrecognized tax benefits, accrued interest and penalties	500		500	700
Accounts Payable and Accrued Expenses [Member]
Income Tax [Line Items]
Current taxes payable	4,200		4,200	$ 16,000
Other Assets [Member]
Income Tax [Line Items]
Current taxes receivable	$ 54,300		$ 54,300
Scenario Forecast [Member]
Income Tax [Line Items]
Corporate tax rate		21.00%

Income Taxes (Unrecognized Tax

Income Taxes (Unrecognized Tax Benefits) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Components Of Income Tax Expense Benefit Continuing Operations [Abstract]
Beginning balance	$ 1,800	$ 2,717	$ 5,510
Increase related to prior year tax positions	3,036	5	1,206
Decrease related to prior year tax positions	(287)	(31)	(33)
Decrease related to settlements with taxing authorities	(171)	(42)	(4,815)
Decrease related to lapsing of statute of limitations	(1,198)
Increase/(decrease) related to business acquisitions		(849)	849
Ending balance	$ 3,180	$ 1,800	$ 2,717

Segment Reporting (Narrative) (

Segment Reporting (Narrative) (Details)	12 Months Ended
	Dec. 31, 2017Segment
Segment Reporting Information [Line Items]
Number of reporting segments	3
Global Wealth Management [Member]
Segment Reporting Information [Line Items]
Number of operating segments	2

Segment Reporting (Schedule Of

Segment Reporting (Schedule Of Operating Information, Segment) (Details) - USD ($) $ in Thousands		3 Months Ended								12 Months Ended
		Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2017		Dec. 31, 2016		Dec. 31, 2015
Segment Reporting Information [Line Items]
Net revenues		$ 804,085	$ 721,169	$ 725,647	$ 675,531	$ 661,391	$ 641,986	$ 652,145	$ 619,974	$ 2,926,432	[1]	$ 2,575,496	[1]	$ 2,331,594	[1]
Income/(loss) before income taxes										269,536		142,582		141,567
Global Wealth Management [Member]
Segment Reporting Information [Line Items]
Net revenues	[1]									1,822,218		1,563,410		1,377,313
Income/(loss) before income taxes										626,906		430,318		382,126
Institutional Group [Member]
Segment Reporting Information [Line Items]
Net revenues	[1]									1,110,768		1,014,164		975,594
Income/(loss) before income taxes										217,981		164,143		141,042
Other [Member]
Segment Reporting Information [Line Items]
Net revenues	[1]									(6,554)		(2,078)		(21,313)
Income/(loss) before income taxes										$ (575,351)		$ (451,879)		$ (381,601)
[1]	No individual client accounted for more than 10 percent of total net revenues for the years ended December 31, 2017, 2016, and 2015.

Segment Reporting (Schedule 123

Segment Reporting (Schedule Of Operating Information, Segment) (Parenthetical) (Details)	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Segment Reporting [Abstract]
Net revenues accounted for by individual client, maximum percentage	10.00%	10.00%	10.00%

Segment Reporting (Schedule 124

Segment Reporting (Schedule Of Information Of Total Assets On Segment Basis) (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Segment Reporting Information [Line Items]
Total assets	$ 21,383,953	$ 19,129,356
Global Wealth Management [Member]
Segment Reporting Information [Line Items]
Total assets	17,717,617	16,065,503
Institutional Group [Member]
Segment Reporting Information [Line Items]
Total assets	3,313,304	2,657,183
Other [Member]
Segment Reporting Information [Line Items]
Total assets	$ 353,032	$ 406,670

Segment Reporting (Schedule 125

Segment Reporting (Schedule Of Net Revenues Earned On Major Geographical Areas) (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2017		Dec. 31, 2016		Dec. 31, 2015
Segment Reporting Information [Line Items]
Total net revenues	$ 804,085	$ 721,169	$ 725,647	$ 675,531	$ 661,391	$ 641,986	$ 652,145	$ 619,974	$ 2,926,432	[1]	$ 2,575,496	[1]	$ 2,331,594	[1]
United States [Member]
Segment Reporting Information [Line Items]
Total net revenues									2,783,175		2,429,714		2,195,538
United Kingdom [Member]
Segment Reporting Information [Line Items]
Total net revenues									129,288		132,622		125,552
Other [Member]
Segment Reporting Information [Line Items]
Total net revenues									$ 13,969		$ 13,160		$ 10,504
[1]	No individual client accounted for more than 10 percent of total net revenues for the years ended December 31, 2017, 2016, and 2015.

Earnings Per Share (Computation

Earnings Per Share (Computation Of Basic And Diluted Earnings Per Share ) (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Earnings Per Share [Abstract]
Net income	$ (1,988)	$ 66,536	$ 52,811	$ 65,512	$ 26,880	$ 17,814	$ 9,771	$ 27,055	$ 182,871	$ 81,520	$ 92,336
Preferred dividends	2,344	2,343	2,344	2,344	2,343	1,563			9,375	3,906
Net Income available to common shareholders	$ (4,332)	$ 64,193	$ 50,467	$ 63,168	$ 24,537	$ 16,251	$ 9,771	$ 27,055	$ 173,496	$ 77,614	$ 92,336
Average shares used in basic computation	68,782	68,522	68,556	68,386	66,636	66,482	66,792	67,579	68,562	66,871	68,543
Dilutive effect of stock options and units									12,473	10,692	10,011
Average shares used in diluted computation	68,782	80,881	80,021	80,695	79,539	77,544	75,982	76,086	81,035	77,563	78,554
Basic	$ (0.06)	$ 0.94	$ 0.74	$ 0.92	$ 0.37	$ 0.24	$ 0.15	$ 0.40	$ 2.53	$ 1.16	$ 1.35
Diluted	$ (0.06)	$ 0.79	$ 0.63	$ 0.78	$ 0.31	$ 0.21	$ 0.13	$ 0.36	$ 2.14	$ 1	$ 1.18

Shareholders' Equity (Details)

Shareholders' Equity (Details) - USD ($) $ / shares in Units, $ in Millions	Jan. 03, 2017	Jul. 11, 2016	Jun. 05, 2015	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Business Acquisition Equity Interests Issued Or Issuable [Line Items]
Number of shares authorized to be repurchased				7,100,000
Purchase of treasury stock				$ 13	$ 113.5
Treasury Stock, Shares, Acquired				300,000	3,400,000
Treasury Stock Acquired, Average Cost Per Share				$ 43.83	$ 33.22
Common stock reissued				2,400,000
Preferred stock, par value				$ 1	$ 1	$ 1
Non-Cumulative Perpetual Preferred Stock, Series A [Member]
Business Acquisition Equity Interests Issued Or Issuable [Line Items]
Issuance of preferred stock		$ 150
Preferred stock, dividend rate percentage		6.25%
Preferred stock, par value		$ 1
Preferred stock liquidation preference per depositary share		25
Preferred stock, liquidation preference per share		$ 25,000
City Securities [Member]
Business Acquisition Equity Interests Issued Or Issuable [Line Items]
Stock Issued During Period Shares Acquisitions	200,000
Sterne Agee Group, Inc. [Member]
Business Acquisition Equity Interests Issued Or Issuable [Line Items]
Stock Issued During Period Shares Acquisitions			1,400,000
Eaton Partners and ISM [Member]
Business Acquisition Equity Interests Issued Or Issuable [Line Items]
Stock Issued During Period Shares Acquisitions					300,000

Variable Interest Entities (Det

Variable Interest Entities (Details) $ in Millions	Dec. 31, 2017USD ($)
Variable Interest Entity [Line Items]
Assets in partnership	$ 199.6
Weisel Capital Management LLC [Member]
Variable Interest Entity [Line Items]
Assets in partnership	$ 286

Subsequent Events (Details)

Subsequent Events (Details)	12 Months Ended
	Dec. 31, 2017item
Subsequent Events [Abstract]
Number of types of subsequent events	2

Quarterly Financial Informat130

Quarterly Financial Information (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2017		Dec. 31, 2016		Dec. 31, 2015
Quarterly Financial Information Disclosure [Abstract]
Operating revenues	$ 697,335	$ 620,932	$ 633,340	$ 590,474	$ 586,665	$ 586,488	$ 603,627	$ 571,299
Interest income	126,615	117,862	108,951	100,953	90,844	74,881	65,780	62,786	$ 454,381		$ 294,332		$ 179,101
Total revenues	823,950	738,794	742,291	691,427	677,509	661,369	669,407	634,085	2,996,462		2,642,370		2,376,993
Interest expense	19,865	17,625	16,644	15,896	16,118	19,383	17,262	14,111	70,030		66,874		45,399
Net revenues	804,085	721,169	725,647	675,531	661,391	641,986	652,145	619,974	2,926,432	[1]	2,575,496	[1]	2,331,594	[1]
Total non-interest expenses	804,905	613,030	642,449	596,512	606,497	614,004	636,352	576,061	2,656,896		2,432,914		2,190,027
Income before income tax expense	(820)	108,139	83,198	79,019	54,894	27,982	15,793	43,913	269,536		142,582		141,567
Provision for income taxes	1,168	41,603	30,387	13,507	28,014	10,168	6,022	16,858	86,665		61,062		49,231
Net income	(1,988)	66,536	52,811	65,512	26,880	17,814	9,771	27,055	182,871		81,520		92,336
Preferred dividends	2,344	2,343	2,344	2,344	2,343	1,563			9,375		3,906
Net Income available to common shareholders	$ (4,332)	$ 64,193	$ 50,467	$ 63,168	$ 24,537	$ 16,251	$ 9,771	$ 27,055	$ 173,496		$ 77,614		$ 92,336
Earnings per common share
Basic	$ (0.06)	$ 0.94	$ 0.74	$ 0.92	$ 0.37	$ 0.24	$ 0.15	$ 0.40	$ 2.53		$ 1.16		$ 1.35
Diluted	$ (0.06)	$ 0.79	$ 0.63	$ 0.78	$ 0.31	$ 0.21	$ 0.13	$ 0.36	$ 2.14		$ 1		$ 1.18
Weighted-average number of common shares outstanding:
Basic	68,782	68,522	68,556	68,386	66,636	66,482	66,792	67,579	68,562		66,871		68,543
Diluted	68,782	80,881	80,021	80,695	79,539	77,544	75,982	76,086	81,035		77,563		78,554
Cash dividends declared per common share	$ 0.10	$ 0.10							$ 0.20
[1]	No individual client accounted for more than 10 percent of total net revenues for the years ended December 31, 2017, 2016, and 2015.