First Eagle Private Credit (NEWS) 10-Q 3 Nov 17 2017 Q3 Quarterly report Financial data

Document and Entity Information

Document and Entity Information - shares	9 Months Ended
	Sep. 30, 2017	Nov. 01, 2017
Document And Entity Information [Abstract]
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Sep. 30, 2017
Document Fiscal Year Focus	2,017
Document Fiscal Period Focus	Q3
Trading Symbol	NEWS
Entity Registrant Name	NewStar Financial, Inc.
Entity Central Index Key	1,373,561
Current Fiscal Year End Date	--12-31
Entity Filer Category	Accelerated Filer
Entity Common Stock, Share Outstanding		41,555,754

Condensed Consolidated Balance

Condensed Consolidated Balance Sheets - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016
Assets:
Cash and cash equivalents	$ 62,538	$ 154,480
Restricted cash	251,653	262,643
Cash collateral on deposit with custodians	7,564	7,564
Investments in debt securities, available-for-sale	175,837	119,307
Loans held-for-sale, net	371,941	144,060
Loans, net (including loans at fair value of $407,465 and $403,745, respectively)	2,995,997	3,239,191
Interest receivable	15,496	14,622
Property and equipment, net	212	274
Deferred income taxes, net	32,081	40,807
Income tax receivable	6,606
Goodwill	17,884	17,884
Identified intangible asset, net	5,318	572
Other assets	59,507	39,188
Total assets	4,002,634	4,040,592
Liabilities:
Credit facilities, net	456,961	445,493
Term debt, net	16,973
Term debt securitizations, net	2,085,733	2,195,064
Senior notes, net	375,287	373,919
Subordinated notes, net	246,929	241,390
Repurchase agreements, net	80,569	55,046
Accrued interest payable	34,435	21,319
Income tax payable		12,562
Other liabilities	59,995	48,377
Total liabilities	3,356,882	3,393,170
Stockholders’ equity:
Preferred stock, par value $0.01 per share (5,000,000 shares authorized; no shares outstanding)
Common stock, par value $0.01 per share: Shares authorized: 145,000,000 in 2017 and 2016; Shares outstanding 41,480,754 in 2017 and 42,820,198 in 2016	415	428
Additional paid-in capital	747,438	743,783
Retained earnings	67,173	59,577
Common stock held in treasury, at cost; 16,182,143 in 2017 and 14,352,904 in 2016	(171,288)	(152,720)
Accumulated other comprehensive income (loss), net	2,014	(3,646)
Total stockholders’ equity	645,752	647,422
Total liabilities and stockholders’ equity	$ 4,002,634	$ 4,040,592

Condensed Consolidated Balance3

Condensed Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016
Preferred stock, par value (in dollars per share)	$ 0.01	$ 0.01
Preferred stock, shares authorized	5,000,000	5,000,000
Preferred stock, shares outstanding	0	0
Common stock, par value (in dollars per share)	$ 0.01	$ 0.01
Common stock, shares authorized	145,000,000	145,000,000
Common stock, shares outstanding	41,480,754	42,820,198
Treasury stock, shares	16,182,143	14,352,904
Commercial Lending and Asset Management [Member]
Loans at fair value	$ 407,465	$ 403,745

Condensed Consolidated Statemen

Condensed Consolidated Statements of Operations - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Net interest income:
Interest income	$ 58,752	$ 65,155	$ 170,747	$ 186,499
Interest expense	43,145	39,897	126,144	117,816
Net interest income	15,607	25,258	44,603	68,683
Provision for credit losses	1,494	3,570	10,341	24,906
Net interest income after provision for credit losses	14,113	21,688	34,262	43,777
Non-interest income:
Asset management income	3,544	3,353	11,017	10,337
Fee income	1,025	2,946	6,379	5,836
Realized loss on derivatives, net		(13)		(31)
Realized gain (loss) on sale of loans, net	294	(19)	1,501	36
Other miscellaneous income, net	1,984	794	5,330	3,490
Mark to market adjustment on fair value loans	(867)	3,437	(6,817)	3,705
Loss on total return swap				(6,062)
Unrealized (loss) gain on loans held-for-sale, net	(457)	468	(557)	(5,345)
Gain on sale of Business Credit, net				22,511
Total non-interest income	5,523	10,966	16,853	34,477
Operating expenses:
Compensation and benefits	7,480	13,175	21,664	32,640
General and administrative expenses	4,420	4,894	12,172	15,337
Total operating expenses	11,900	18,069	33,836	47,977
Income before income taxes	7,736	14,585	17,279	30,277
Income tax expense	3,151	5,941	7,160	12,383
Net income	$ 4,585	$ 8,644	$ 10,119	$ 17,894
Basic Earnings per share	$ 0.11	$ 0.19	$ 0.24	$ 0.38
Diluted Earnings per share	0.11	$ 0.19	0.24	$ 0.38
Dividends declared per common share	$ 0.02		$ 0.06

Condensed Consolidated Stateme5

Condensed Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Statement Of Income And Comprehensive Income [Abstract]
Net income	$ 4,585	$ 8,644	$ 10,119	$ 17,894
Other comprehensive income (loss), net of tax:
Net unrealized securities gains (losses), net of tax expense (benefit) of $604, $2,044, $3,871 and $789, respectively	884	3,028	5,664	1,193
Net unrealized derivative gains, net of tax expense (benefit) of $[-], $5, $(3) and $2, respectively		8	(4)	(3)
Other comprehensive income (loss)	884	3,036	5,660	1,190
Comprehensive income	$ 5,469	$ 11,680	$ 15,779	$ 19,084

Condensed Consolidated Stateme6

Condensed Consolidated Statements of Comprehensive Income (Parenthetical) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Statement Of Income And Comprehensive Income [Abstract]
Tax expense (benefit) on unrealized securities gains (losses)	$ 604	$ 2,044	$ 3,871	$ 789
Tax expense (benefit) on unrealized derivative gains		$ 5	$ (3)	$ 2

Condensed Consolidated Stateme7

Condensed Consolidated Statements of Changes in Stockholders' Equity - USD ($) $ in Thousands	Total	Common Stock [Member]	Additional Paid-in Capital [Member]	Retained​ Earnings​ [Member]	Treasury Stock [Member]	Accumulated Other Comprehensive Income (Loss), Net [Member]
Beginning Balance at Dec. 31, 2015	$ 659,478	$ 465	$ 742,970	$ 31,353	$ (109,245)	$ (6,065)
Net income	17,894			17,894
Other comprehensive income	1,190					1,190
Issuance of restricted stock		6	(6)
Net shares reacquired from employee transactions	(445)	(1)	1		(445)
Tax benefit (expense) from vesting of restricted stock	(473)		(473)
Repurchase of common stock	(8,862)	(12)	12		(8,862)
Exercise of common stock options, net	(1,099)	9	(1,108)
Tax benefit from exercise of stock options	1,225		1,225
Amortization of restricted common stock awards	2,822		2,822
Ending Balance at Sep. 30, 2016	671,730	467	745,443	49,247	(118,552)	(4,875)
Beginning Balance at Dec. 31, 2016	647,422	428	743,783	59,577	(152,720)	(3,646)
Net income	10,119			10,119
Other comprehensive income	5,660					5,660
Common stock dividends of $0.06 per share	(2,523)			(2,523)
Issuance of restricted stock		4	(4)
Net shares reacquired from employee transactions	(829)	(1)	1		(829)
Repurchase of common stock	(17,739)	(18)	18		(17,739)
Exercise of common stock options, net	1,041	2	1,039
Amortization of restricted common stock awards	2,601		2,601
Ending Balance at Sep. 30, 2017	$ 645,752	$ 415	$ 747,438	$ 67,173	$ (171,288)	$ 2,014

Condensed Consolidated Stateme8

Condensed Consolidated Statements of Changes in Stockholders' Equity (Parenthetical) - $ / shares	Jul. 31, 2017	May 02, 2017	Feb. 14, 2017	Sep. 30, 2017	Sep. 30, 2017
Statement Of Stockholders Equity [Abstract]
Common stock, dividends, per share	$ 0.02	$ 0.02	$ 0.02	$ 0.02	$ 0.06

Condensed Consolidated Stateme9

Condensed Consolidated Statements of Cash Flows $ in Thousands	9 Months Ended
	Sep. 30, 2017USD ($)	Sep. 30, 2016USD ($)
Cash flows from operating activities:
Net income	$ 10,119	$ 17,894
Adjustments to reconcile net income to net cash used for operations:
Provision for credit losses	10,341	24,906
Depreciation, amortization and accretion, net	(9,609)	(9,159)
Amortization of debt issuance costs	12,818	13,720
Equity compensation expense	2,601	2,822
Gain on sale of Business Credit, net		(22,511)
Gain on sale of loans, net	(1,501)	(36)
Loss on total return swap		6,062
Gain on sale of equipment, net		(724)
Loss on sale of CLO bonds	2
Net change in deferred income taxes	4,859	2,466
Loans held-for-sale originated	(765,180)	(217,132)
Proceeds from sale of loans held-for-sale	568,288	313,287
Unrealized loss on loans held-for-sale, net	557	5,345
Net change in interest receivable	(874)	(2,340)
Net change in other assets	(17,406)	(15,090)
Net change in accrued interest payable	13,116	13,086
Net change in other liabilities	(32,505)	(11,165)
Net cash (used in) provided by operating activities	(204,374)	121,431
Cash flows from investing activities:
Net change in restricted cash	10,991	(240,397)
Net change in loans and leases	233,681	(92,685)
Purchase of equity investments	(5,222)	(4,052)
Return of capital - equity investments	793
Purchase of debt securities, available-for-sale	(39,709)
Proceeds from debt securities, available-for-sale	6,226	6,000
Purchase of property and equipment	(20)	(9)
Net cash provided by (used in) investing activities	206,740	(331,143)
Cash flows from financing activities:
Inputs from exercise of stock options, net	1,041	(1,099)
Tax benefit from exercise of stock options		1,225
Tax expense from vesting of restricted stock		(473)
Payment of dividends on common stock	(2,523)
Advances on credit facilities	431,100	1,282,522
Repayment of borrowings on credit facilities	(421,500)	(1,602,978)
Issuance of term debt securitization	303,000	623,197
Borrowings on term debt securitization		37,600
Repayment of borrowings on term debt securitization	(415,057)	(142,155)
Borrowing of term debt	4,000
Borrowing on subordinated notes		24,500
Borrowings on repurchase agreements	29,539	3,496
Repayment of borrowings on repurchase agreements	(4,016)	(47,694)
Release of cash collateral		53,517
Payment of deferred financing costs	(1,324)	(10,240)
Purchase of treasury stock	(18,568)	(9,307)
Net cash (used in) provided by financing activities	(94,308)	212,111
Net decrease in cash during the period	(91,942)	2,399
Cash and cash equivalents at beginning of period	154,480	35,933
Less cash of Equipment Finance held-for-sale		(2,066)
Cash and cash equivalents at end of period	62,538	36,266
Supplemental cash flows information:
Interest paid	113,078	104,731
Taxes paid, net of refund	21,478	5,201
Assumed debt related to acquisition of investment in available for sale securities	12,973
Transfer of loans, net to other real estate owned		15,781
Transfer of loans, net to loans-held-for-sale, at fair value	31,546	67,704
Transfer of Equipment Finance assets to held-for-sale		160,735
Transfer of Equipment Finance liabilities to held-for-sale		44,158
Unsettled trades payable	$ 21,488	$ 138,639

Organization

Organization	9 Months Ended
	Sep. 30, 2017
Accounting Policies [Abstract]
Organization	Note 1. Organization NewStar Financial, Inc. ("NewStar"), together with its consolidated subsidiaries (collectively, the "Company"), is an internally-managed, middle market direct lender and credit-oriented asset manager headquartered in Boston, MA. The Company’s direct lending activities are focused on meeting the complex financing needs of companies and private investors in the middle market by offering a range of flexible debt financing options. The Company also offers a range of investment management products employing credit-oriented strategies focused on middle market loans and liquid, tradeable credit. The Company manages approximately $7.2 billion of assets, $3.6 billion held in consolidated subsidiaries of the Company and $3.6 billion in off balance sheet credit funds. NewStar operates its business through two reportable segments: Commercial Lending and Asset Management. Commercial Lending These lending activities require specialized skills and transaction experience, as well as a significant investment in personnel and operating infrastructure. To meet these demands, our loans are originated directly by teams of credit-trained bankers. These teams are supported by centralized credit management and operating platforms. This structure enables us to leverage common standards, systems, and industry and professional expertise across the two segments. The Company targets its marketing and origination efforts at private equity firms, mid-sized companies, corporate executives, banks and a variety of other referral sources and financial intermediaries to develop new customer relationships and source lending opportunities. The Company's origination network is national in scope and it targets companies with business operations across a broad range of industry sectors. The Company employs highly experienced bankers and credit professionals to identify and structure new lending opportunities and manage customer relationships. The Company believes that the quality of its professionals, the breadth of their relationships and referral networks, and their ability to develop creative solutions for customers position it to be a valued partner and preferred lender for mid-sized companies and private equity funds with middle market investment strategies. The Company's emphasis on direct origination is an important aspect of its marketing and credit strategy. The Company's national network is designed around specialized origination channels intended to generate a large set of potential lending opportunities. That allows the Company to be highly selective in its credit process and to allocate capital to market segments that we believe represent the most attractive opportunities. The Company's direct origination network also generates proprietary lending opportunities with yield characteristics that we believe would not otherwise be available through intermediaries. In addition, direct origination provides the Company with direct access to management teams and enhances its ability to conduct detailed due diligence and credit analysis of prospective borrowers. It also allows the Company to negotiate transaction terms directly with borrowers and, as a result, advise its customers on financial strategies and capital structures, which it believes benefits its credit performance. The size of financing commitments depends on various factors, including the type of loan, the credit characteristics of the borrower, the economic characteristics of the loan, and the Company's role in the transaction. The Company also arranges larger transactions that it may retain on its balance sheet or syndicate to other lenders, which include off balance sheet managed credit funds managed by the Company for third party institutional investors. By syndicating loans to other lenders and the Company's off balance sheet managed credit funds, it is able to provide larger financing commitments to its customers and generate fee income, while limiting its risk exposure to single borrowers. Asset Management As a registered investment adviser, NewStar offers a range of investment products employing credit-oriented strategies focused on middle market loans and liquid tradeable credit. The Company manages a series of private credit funds that co-invest in middle market loans originated through its established leveraged finance lending platform. Through its registered investment adviser subsidiary, NewStar Capital, the Company also manages assets across a series of CLOs that invest primarily in broadly syndicated loans, as well as other sponsored funds and managed accounts that invest across various liquid, non-investment grade asset classes, including broadly syndicated loans and bonds.

Summary of Significant Accounti

Summary of Significant Accounting Policies	9 Months Ended
	Sep. 30, 2017
Accounting Policies [Abstract]
Summary of Significant Accounting Policies	Note 2. Summary of Significant Accounting Policies Basis of Presentation These interim condensed consolidated financial statements include the accounts of the Company and its subsidiaries and those variable interest entities (“VIEs”) where the Company is the primary beneficiary. These interim condensed consolidated financial statements have been prepared in accordance with accounting principles generally accepted in the United States of America ("GAAP") for interim financial information and pursuant to the requirements for reporting on Form 10-Q and Article 10 of Regulation S-X. Accordingly, they do not include all of the information and notes required by GAAP for complete financial statements. All significant intercompany transactions have been eliminated in consolidation. In the opinion of Management, all adjustments (consisting of normal recurring adjustments) considered necessary for the fair presentation of the interim condensed consolidated financial statements have been included. As discussed in Note 17, the Company entered into a definitive agreement with First Eagle Holdings, Inc. and certain of its direct and indirect subsidiaries, as a result of which the Company will become an indirect wholly-owned subsidiary of First Eagle. The closing of the transactions contemplated by the agreement is subject to the approval of our stockholders, regulatory approvals, and other conditions. As a result, none of the condensed consolidated financial statements and related disclosures in this Form 10-Q consider the potential impact of the pending merger and related transactions. Principles of Consolidation The Company consolidates entities in which it, directly or indirectly, is determined to have a controlling financial interest under ASC Topic 810, as amended by ASU No. 2015-02, Consolidation – Amendments to the Consolidation Analysis, which revised the existing consolidation guidance and required the Company to re-evaluate whether to consolidate certain types of entities. Investments in Consolidated Variable Interest Entities The Company sponsors the formation of various entities that are considered to be VIEs. The majority of these VIEs were formed to issue term debt securitizations used to fund the Company’s lending activities. The assets of the VIEs are primarily comprised of senior secured loans and the liabilities are primarily comprised of asset backed securities. In instances where the Company retains 100% of the equity interests and services the loans, the Company is considered the primary beneficiary of the VIE and consolidates the entities. Investments in Unconsolidated Variable Interest Entities and Other Unconsolidated Entities The Company also holds variable interests in certain VIEs that are not consolidated because the Company is not considered the primary beneficiary, including its investments in certain managed credit funds and CLOs. The Company’s involvement with such entities is in the form of equity interests that the Company has deemed more than insignificant and/or asset management fees for services provided. In instances where the Company holds equity interests, those interests are held on our balance sheet and included in Investments in Debt Securities, Available-for-Sale. The Company manages a series of other entities and separately managed accounts for third parties. The Company receives fees for services performed with respect to such entities, which the Company has determined are not variable interests. These fees earned by the Company are included in asset management income. Investments in unconsolidated variable interest entities and other unconsolidated entities are referred to in this Quarterly Report as off balance sheet managed credit funds. Prior Period Reclassification Prior period amounts are reclassified wherever necessary to conform with current period presentation. Recently Adopted Accounting Standards In November 2015, the FASB issued ASU 2015-17, Income Taxes (Topic 740). In March 2016, the FASB issued ASU 2016-07, Simplifying the Transition to the Equity Method of Accounting (Topic 323) In March 2016, the FASB issued ASU 2016-09, Improvements to Employee Share-Based Payment Accounting (Topic 718) In December 2016, the FASB issued ASU 2016-19, Technical Corrections and Improvements In January 2017, the FASB issued ASU 2017-01, Business Combinations (Topic 805): Clarifying the Definition of a Business. ASU 2017-01 is Issued Accounting Standards Not Yet Adopted In May 2014, the FASB issued ASU 2014-09, Revenue from Contracts with Customers (Topic 606). In January 2016, the FASB issued ASU 2016-01, Financial Instruments – Recognition and Measurement of Financial Assets and Financial Liabilities (Topic 825-10) In February 2016, the FASB issued ASU 2016-02, Leases (Topic 842) In June 2016, the FASB issued ASU 2016-13, Financial Instruments-Credit Losses (Topic 326) In August 2016, the FASB issued ASU 2016-15, Statement of Cash Flows (Topic 230). In October 2016, the FASB issued ASU 2016-17, Consolidation (Topic 810), Interest Held Through Related Parties That Are Under Common Control In November 2016, the FASB issued ASU 2016-18, Statement of Cash Flows (Topic 230): Restricted Cash. In January 2017, the FASB issued ASU 2017-04, Intangibles - Goodwill and Other (Topic 350): Simplifying the Test for Goodwill Impairment. In March 2017, the FASB issued ASU 2017-08, Receivables – Nonrefundable Fees and Other Costs (Topic 310): Premium Amortization on Purchased Callable Debt Securities.

Acquisition and Disposition Act

Acquisition and Disposition Activities	9 Months Ended
	Sep. 30, 2017
Business Combinations [Abstract]
Acquisition and Disposition Activities	Note 3. Acquisition and Disposition Activities Acquisition of Fifth Street CLO Management LLC On July 20, 2017, the Company acquired 100% of the limited liability company interests of Fifth Street CLO Management LLC (“FSCM”), a wholly-owned subsidiary of Fifth Street Holdings L.P. The purchase included contracts to manage two off balance sheet middle market CLOs and certain interests in the CLOs which will be held on the balance sheet of NewStar after the acquisition to comply with risk retention requirements. FSCM was subsequently rebranded and now operates as NewStar Commercial Loan Originator II LLC, a wholly-owned subsidiary of the Company. The Company evaluated the transaction under ASU 2017-01 and concluded that it does not meet the definition of a business and therefore is treated as an asset acquisition. The purchase price was $16.6 million, net of $13.1 million of assumed indebtedness. The assets acquired and the liabilities assumed in the acquisition were recorded by the company at their estimated fair values as of the acquisition date. Fair Value ($ in thousands) Assets Acquired Investment in available for sale securities $ 23,068 Identified intangible assets 5,394 Other assets 1,221 Total assets acquired $ 29,683 Liabilities Assumed Accrued expenses $ 125 Term Debt 12,973 Total Liabilities Assumed $ 13,098 Identified, net assets acquired $ 16,585 Fair values of the major categories of assets acquired and liabilities assumed were determined as follows: The fair value of investments in available for sale securities was determined based upon the value of notes of the CLO’s determined through a third party appraisal. The majority of these notes were retained for European Union (“EU”) risk retention rules. The fair value of the customer contracts and related customer relationships included in identified intangible assets above, was determined using the excess earnings method under the income approach per ASC 820. Management projected net cash flows of each investment / collateral management agreement acquired to estimate the useful life of the respective contracts. These net after-tax cash flows were discounted to present value as of the acquisition date. The fair value of customer contracts and related customer relationships was estimated at $5.4 million. The intangible assets are being amortized over their expected economic useful life, which we estimate at 3.5 years. The fair value of other assets included accrued management fees, prepaid expenses and miscellaneous receivables which the Company believes approximated carrying value. The fair value of the accrued expenses approximated the carrying value of these accounts. The fair value of the term debt was recorded at the outstanding amount due to the third party as of the acquisition date which the Company believes approximated carrying value. Sale of NewStar Equipment Finance assets and related platform On December 1, 2016, the Company sold the assets of NewStar Equipment Finance (“Equipment Finance”) and related platform to a third party and exited the business. The sale of Equipment Finance assets was the result of the Company’s decision to exit businesses with economic models increasingly challenged by competition from banks and other lenders with access to lower cost funding. The sale resulted in a gain of $6.7 million, before transaction related costs of $4.3 million. The net gain was recorded in non-interest income on the consolidated statement of operations. In connection with the sale of the assets of Equipment Finance, the Company established a $1.4 million contingent liability to cover any potential credit indemnification costs resulting from actual credit losses incurred on the assets sold. As of September 30, 2017, this amount was reduced to $1.0 million. This liability reflects management’s best estimate of losses, taking into consideration the individual credit quality and borrower activity since origination and the anticipated residual value of the assets sold. As of September 30, 2017, the Company had not been notified or required to pay for any credit losses on the assets sold. The initial indemnification is capped at $10.0 million of actual credit losses and is reduced to $8.0 million at December 31, 2017, then further reduced to $5.0 million at December 31, 2018, $3.0 million at December 31, 2019 and zero as of December 31, 2020. Sale of NewStar Business Credit LLC On March 31, 2016, the Company sold its asset based lending business, NewStar Business Credit LLC (“Business Credit”) to a third party. The sale resulted in a gain of $22.5 million, before transaction related costs of $2.5 million. The net gain was recorded in non-interest income on the accompanying consolidated statement of operations.

Loans Held-for-Sale, Loans, Lea

Loans Held-for-Sale, Loans, Leases and Allowance for Credit Losses	9 Months Ended
	Sep. 30, 2017
Receivables [Abstract]
Loans Held-for-Sale, Loans, Leases and Allowance for Credit Losses	Note 4. Loans Held-for-Sale, Loans, Leases and Allowance for Credit Losses As of September 30, 2017 and December 31, 2016, loans held-for-sale consisted of the following: September 30, 2017 December 31, 2016 ($ in thousands) Leveraged Finance $ 376,276 $ 146,126 Lower cost or market adjustment (716 ) (160 ) Gross loans held-for-sale 375,560 145,966 Deferred loan fees, net (3,619 ) (1,906 ) Loans held-for-sale, net $ 371,941 $ 144,060 These loans are carried at the lower of aggregate cost, net of any deferred origination costs or fees, or fair value. At September 30, 2017, loans held-for-sale consisted of loans with an aggregate outstanding balance of $376.3 million that were intended to be sold to off balance sheet managed credit funds. The Company sold loans with an outstanding balance totaling $48.3 million to entities other than off balance sheet managed credit funds for an aggregate gain of $0.1 million during the nine months ended September 30, 2017. The Company sold loans with an outstanding balance of $105.0 million for a net loss of $0.04 million to entities other than off balance sheet managed credit funds during the nine months ended September 30, 2016. As of September 30, 2017, and December 31, 2016, loans consisted of the following: September 30, 2017 December 31, 2016 ($ in thousands) Leveraged Finance (1) $ 3,049,574 $ 3,308,926 Real Estate 10,716 10,624 Gross loans 3,060,290 3,319,550 Deferred loan fees and discount, net (24,534 ) (29,423 ) Allowance for loan losses (39,759 ) (50,936 ) Total loans, net $ 2,995,997 $ 3,239,191 (1) Includes loans at fair value of $407.5 million and $403.7 million, respectively. The Company holds broadly syndicated loans in our fair value portfolio as part of our liquid credit strategy, which by nature tend to experience higher prepayment and refinancing rates compared to our middle market loans. As a result this portfolio may be more actively managed to optimize performance. The Company provides commercial loans to customers throughout the United States. The Company’s borrowers may be susceptible to economic slowdowns or recessions and, as a result, may have a lower capacity to make scheduled payments of interest or principal on their borrowings during these periods. Although the Company has a diversified loan portfolio, certain events may occur, including, but not limited to, adverse economic conditions and adverse events affecting specific clients, industries or markets, that could adversely affect the ability of borrowers to make timely scheduled principal and interest payments on their loans. The Company internally risk rates loans based on individual credit criteria on at least a quarterly basis. Borrowers provide the Company with financial information on either a quarterly or monthly basis. Loan ratings as well as identification of impaired loans are dynamically updated to reflect changes in borrower condition or profile. A loan is considered to be impaired when it is probable that the Company will be unable to collect all amounts due to it according to the contractual terms of the loan agreement. Impaired loans include all non-accrual loans, loans with partial charge-offs and loans which are troubled debt restructuring (“TDR”). The Company utilizes a number of analytical tools for the purpose of estimating probability of default and loss given default for its lending groups. The quantitative models employed by the Company in its Leveraged Finance business utilize Moody’s KMV RiskCalc credit risk model in combination with a proprietary qualitative model, which generates a rating that maps to a probability of default estimate. For real estate loans, the Company utilizes a proprietary model that has been developed to capture risk characteristics unique to the lending activities in that line of business. Together, these models produce a suggested obligor risk rating which corresponds to a probability of default and also produces a loss given default. In each case, the probability of default and the loss given default are used to calculate an expected loss for those lending groups. P rior to the sale of the Equipment Finance assets, management used similar models for its Equipment Finance portfolio as its Leveraged Finance group. Prior to the sale of Loans which are rated at or better than a specified threshold are typically classified as “Pass”, and loans rated worse than that threshold are typically classified as “Criticized”, a characterization that may apply to impaired loans, including TDR. As of September 30, 2017, $106.8 million of the Company’s loans were classified as “Criticized,” all of which were impaired loans, and $3.0 billion were classified as “Pass”. As of December 31, 2016, $118.7 million of the Company’s loans were classified as “Criticized” all of which were impaired loans, and $3.2 billion were classified as “Pass”. When the Company determines a loan is impaired, the Company will evaluate the loan individually and, if necessary, establish a specific allowance. The loan will be analyzed and may be placed on non-accrual status. If the asset deteriorates further, the specific allowance may increase, and ultimately may result in a loss and charge-off. A TDR that performs in accordance with the terms of its restructuring may improve its risk profile over time. While the concessions in terms of pricing or amortization may not have been reversed and further amended to “market” levels, the financial condition of the borrower may improve over time to the point where the rating improves from the “Criticized” classification that was appropriate immediately prior to, or at, restructuring. A loan is considered impaired when it is probable that a creditor will be unable to collect all amounts due according to the contractual terms of the loan agreement. The measurement of impairment of a loan is based upon (i) the present value of expected future cash flows discounted at the loan’s effective interest rate, (ii) the loan’s observable market price, or (iii) the fair value of the collateral if the loan is collateral dependent, depending on the circumstances and our collection strategy. Impaired loans are identified based on the loan-by-loan risk rating process described above. It is the Company’s policy during the reporting period to record a specific provision for credit losses and/or partial or full charge off for all loans for which we have serious doubts as to the ability of the borrowers to comply with the present loan repayment terms. As of September 30, 2017, the Company had investments, net of charge-offs in impaired loans with a balance of $153.7 million. Impaired loans with an aggregate outstanding balance of $85.1 million have been restructured and classified as TDRs. At September 30, 2017, additional funding commitments for TDRs totaled $4.1 million. As of September 30, 2017, the aggregate carrying value of equity investments in certain of the Company’s borrowers in connection with troubled debt restructurings totaled $10.9 million. Impaired loans with an aggregate outstanding balance of $103.8 million were also on non-accrual status. These non-accrual loans had a carrying value of $97.4 million before specific reserves. For impaired loans on non-accrual status, the Company’s policy is to reverse the accrued interest previously recognized as interest income subsequent to the last cash receipt in the current year. The recognition of interest income on the loan only resumes when factors indicating doubtful collection no longer exist and the non-accrual loan payment status has been brought current. During the three and nine months ended September 30, 2017, the Company charged off $8.6 million and $21.5 million, respectively of non-accruing loan balances. During the three months ended September 30, 2017, the Company placed one new relationship on non-accrual status with an aggregate outstanding balance of $26.9 million. During the nine months ended September 30, 2017, the Company placed loans with an aggregate outstanding balance of $35.5 million on non-accrual status. During the three and nine months ended September 30, 2017, the Company recorded $3.9 million and $13.4 million, respectively, of net specific provisions for impaired loans. At September 30, 2017, the Company had a $11.7 million specific allowance for impaired loans with an aggregate outstanding balance of $100.1 million. At September 30, 2017, additional funding commitments for impaired loans totaled $14.1 million. The Company’s obligation to fulfill the additional funding commitments on impaired loans is generally contingent on the borrower’s compliance with the terms of the credit agreement. If the borrower is not in compliance additional funding commitments may be made at the Company’s discretion. As of September 30, 2017, the Company had loans totaling $36.7 million which were greater than 60 days past due and classified as delinquent of which $4.0 million were on non-accrual status. Included in the $11.7 million specific allowance for impaired loans was $5.1 million related to delinquent loans. As of December 31, 2016, the Company had investments, net of charge offs in impaired loans with a balance of $133.4 million. At that date, impaired loans with an aggregate outstanding balance of $114.8 million had been restructured and classified as TDR. As of December 31, 2016, the aggregate carrying value of equity investments in certain of the Company’s borrowers in connection with troubled debt restructurings totaled $9.9 million. Impaired loans with an aggregate outstanding balance of $99.2 million were also on non-accrual status. These non-accrual loans had a carrying value of $92.9 million before specific reserves. During 2016, the Company charged off $25.7 million of outstanding non-accrual loans. During 2016, the Company placed loans with an aggregate outstanding balance of $27.1 million on non-accrual status and no loans were returned to performing status. During 2016, the Company recorded $24.8 million of net specific provisions for impaired loans. At December 31, 2016, the Company had a $19.8 million specific allowance for impaired loans with an aggregate outstanding balance of $73.5 million. At December 31, 2016, additional funding commitments for impaired loans totaled $11.9 million. As of December 31, 2016, loans to two borrowers totaling approximately $21.1 million were on non-accrual status and were greater than 60 days past due and classified as delinquent by the Company. Included in the $19.8 million specific allowance for impaired loans was $7.9 million related to delinquent loans. A summary of impaired loans is as follows: Investment, Net of Charge-offs Investment, Net of Unamortized Discount/Premium Unpaid Principal ($ in thousands) September 30, 2017 Impaired loans $ 153,716 $ 146,742 $ 179,471 December 31, 2016 Impaired loans $ 133,413 $ 126,839 $ 154,879 Recorded Investment Related Allowance for Credit Losses Recorded Investment, net, with a Related Allowance for Credit Losses Recorded Investment without a Related Allowance for Credit Losses Recorded Investment, net, without a Related Allowance for Credit Losses ($ in thousands) September 30, 2017 Impaired loans $ 100,085 $ 93,176 $ 53,631 $ 53,566 December 31, 2016 Impaired loans $ 73,499 $ 68,924 $ 59,914 $ 57,915 During the three and nine months ended September 30, 2017, the Company recorded net partial charge-offs of $8.6 million and $21.5 million, respectively. During the three months ended September 30, 2016, the Company recorded a net recovery of $0.05 million on loans previously charged-off, and during the nine months ended September 30, 2016, the Company recorded net charge-offs of $14.2 million. When a loan is determined to be uncollectible, the specific allowance is charged off, which reduces the gross investment in the loan. The Company may record the initial specific allowance related to an impaired loan in the same period as it records a partial charge-off in certain circumstances such as if the terms of a restructured loan are finalized during that period. While charge-offs typically have no net impact on the carrying value of net loans, charge-offs lower the level of the allowance for loan losses, and, as a result, reduce the percentage of allowance for loans to total loans, and the percentage of allowance for loan losses to non-performing loans. Below is a summary of the Company’s evaluation of its amortized cost portfolio and allowance for loan losses by impairment methodology: Leveraged Finance Real Estate September 30, 2017 Investment Allowance Investment Allowance ($ in thousands) Collectively evaluated (1)(2) $ 2,488,393 $ 28,001 $ 10,716 $ 93 Individually evaluated (3) 153,716 11,665 — — Total $ 2,642,109 $ 39,666 $ 10,716 $ 93 Leveraged Finance Real Estate December 31, 2016 Investment Allowance Investment Allowance ($ in thousands) Collectively evaluated (1)(2) $ 2,771,768 $ 31,073 $ 10,624 $ 92 Individually evaluated (3) 133,413 19,771 — — Total $ 2,905,181 $ 50,844 $ 10,624 $ 92 (1) Represents loans collectively evaluated for impairment in accordance with ASC 450-20, Loss Contingencies, and pursuant to amendments by ASU 2010-20 regarding allowance for unimpaired loans. These loans had a weighted average risk rating of 5.3 and 5.2 at September 30, 2017 and December 31, 2016, respectively, based on the Company’s internally developed 12 point scale for the Leveraged Finance and Real Estate loans. (2) Excludes $407.5 million at September 30, 2017 and $403.7 million at December 31, 2016 of Leveraged Finance loans which the Company elected to record at fair value. (3) Represents loans individually evaluated for impairment in accordance with ASU 310-10, Receivables, Below is a summary of the Company’s investment in nonaccrual loans. Recorded Investment in Nonaccrual Loans September 30, 2017 December ($ in thousands) Nonaccrual loans $ 103,819 $ 99,233 Less: Deferred loan fees (6,533 ) (6,485 ) Add back: Interest receivable 73 116 Total $ 97,359 $ 92,864 Loans being restructured have typically developed adverse performance trends as a result of various factors, the result of which is an inability to comply with the terms of the applicable credit agreement governing the borrowers’ obligations to the Company. In order to mitigate default risk and/or liquidation, assuming that liquidation proceeds are not viewed as a more favorable outcome to the Company and other lenders, the Company will enter into negotiations with the borrower and its shareholders on the terms of a restructuring. When restructuring a loan, the Company undertakes an extensive diligence process which typically includes (i) development of a financial model with a forecast horizon that matches the term of the proposed restructuring, (ii) meetings with management of the borrower, (iii) engagement of third party consultants and (iv) other internal analyses. Once a restructuring proposal is developed, it is subject to approval by both the Company’s Underwriting and Investment Committee. Loans are only removed from TDR classification after a period of performance following the refinancing of outstanding obligations on terms which are determined to be “market” in all material respects. The Company may modify loans that are not determined to be a TDR. Where a loan is modified or restructured but loan terms are considered market and no concessions were given on the loan terms, including price, principal amortization or obligation, or other restrictive covenants, a loan will not be classified as a TDR. The Company has made the following types of concessions in the context of a TDR: Group I: • extension of principal repayment term • principal holidays • interest rate adjustments Group II: • partial forgiveness • conversion of debt to equity A summary of the types of concessions that the Company made with respect to TDRs at September 30, 2017 and December 31, 2016 is provided below: Group I Group II ($ in thousands) September 30, 2017 $ 85,095 $ 54,392 December 31, 2016 $ 114,803 $ 77,061 Note: A loan may be included in both restructuring groups, but not repeated within each group. For the three and nine months ended September 30, 2017, the Company recorded $8.6 million and $21.6 million, respectively, of partial charge-offs related to loans previously classified as TDR. As of September 30, 2017, the Company had not removed the TDR classification from any loan previously identified as such during the quarter, but had charged-off, sold and received repayments of outstanding TDRs. The Company measures TDRs similarly to how it measures all loans for impairment. The Company performs a discounted cash flow analysis on cash flow dependent loans and assesses the underlying collateral value less reasonable costs of sale for collateral dependent loans. Management analyzes the projected performance of the borrower to determine if it has the ability to service principal and interest payments based on the terms of the restructuring. Loans will typically not be returned to accrual status until at least six months of contractual payments have been made in a timely manner or the borrower shows significant ability to maintain servicing of the restructured debt. Additionally, at the time of a restructuring and quarterly thereafter, an impairment analysis is undertaken to determine the measurement of specific reserve, if any, on each impaired loan. Below is a summary of the Company’s loans which were newly classified as TDR and existing TDR loans which subsequently defaulted, in each during the periods presented. As of the Three Months Ended September 30, 2017 Pre-Modification Outstanding Recorded Investment Post-Modification Outstanding Recorded Investment Investment in TDR Subsequently Defaulted ($ in thousands) Leveraged Finance $ 5,815 $ 5,277 $ 5,277 Total $ 5,815 $ 5,277 $ 5,277 As of the Nine Months Ended September 30, 2017 Pre-Modification Outstanding Recorded Investment Post-Modification Outstanding Recorded Investment Investment in TDR Subsequently Defaulted ($ in thousands) Leveraged Finance $ 5,815 $ 5,277 $ 34,735 Total $ 5,815 $ 5,277 $ 34,735 As of the Three Months Ended September 30, 2016 Pre-Modification Outstanding Recorded Investment Post-Modification Outstanding Recorded Investment Investment in TDR Subsequently Defaulted ($ in thousands) Leveraged Finance $ 8,372 $ 8,473 $ — Real Estate — — — Total $ 8,372 $ 8,473 $ — As of the Nine Months Ended September 30, 2016 Pre-Modification Outstanding Recorded Investment Post-Modification Outstanding Recorded Investment Investment in TDR Subsequently Defaulted ($ in thousands) Leveraged Finance $ 10,147 $ 9,781 $ — Real Estate (1) — — 4,483 Total $ 10,147 $ 9,781 $ 4,483 (1) Amount reflects charge-off on an impaired Real Estate TDR that was taken prior to transfer to held-for-sale. The following sets forth a breakdown of troubled debt restructurings at September 30, 2017 and December 31, 2016: As of September 30, 2017 Accrual Status For the nine months ($ in thousands) Loan Type Accruing Nonaccrual TDR Balance Specific Allowance Charged-off Leveraged Finance $ 16,025 $ 69,070 $ 85,095 $ 5,279 $ 21,554 Total $ 16,025 $ 69,070 $ 85,095 $ 5,279 $ 21,554 As of December 31, 2016 Accrual Status For the year ($ in thousands) Loan Type Accruing Nonaccrual Impaired Balance Specific Allowance Charged-off Leveraged Finance $ 24,367 $ 90,436 $ 114,803 $ 15,939 $ 26,684 Total $ 24,367 $ 90,436 $ 114,803 $ 15,939 $ 26,684 The Company classifies a loan as delinquent when it is over 60 days past due. An age analysis of the Company’s delinquent receivables is as follows: 60-89 Days Past Due Greater than 90 Days Total Past Due Current Total Loans Investment > 60 Days & Accruing ($ in thousands) September 30, 2017 Leveraged Finance $ — $ 36,656 $ 36,656 $ 3,012,918 $ 3,049,574 $ 22,596 Real Estate — — — 10,716 10,716 — Total $ — $ 36,656 $ 36,656 $ 3,023,634 $ 3,060,290 $ 22,596 60-89 Days Past Due Greater than 90 Days Total Past Due Current Total Loans Investment in > 60 Days & Accruing ($ in thousands) December 31, 2016 Leveraged Finance $ — $ 21,135 $ 21,135 $ 3,287,791 $ 3,308,926 $ — Real Estate — — — 10,624 10,624 — Total $ — $ 21,135 $ 21,135 $ 3,298,415 $ 3,319,550 $ — A general allowance is provided for loans within the amortized portfolio that are not impaired. The Company employs a variety of internally developed and third-party modeling and estimation tools for measuring credit risk, which are used in developing an allowance for loan losses on outstanding loans held at amortized cost. The Company’s allowance framework addresses economic conditions, capital market liquidity and industry circumstances from both a top-down and bottom-up perspective. The Company considers and evaluates a number of factors, including but not limited to, changes in economic conditions, credit availability, industry, loss emergence period, and multiple obligor concentrations in assessing both probabilities of default and loss severities as part of the general component of the allowance for loan losses. The Company continually evaluates the appropriateness of its allowance for credit losses methodology. Based on the Company’s evaluation process to determine the level of the allowance for loan losses, management believes the allowance to be adequate as of September 30, 2017 in light of the estimated known and inherent risks identified through its analysis. The Company closely monitors the credit quality of its loans which is partly reflected in its credit metrics such as loan delinquencies, non-accruals and charge-offs. Changes in these credit metrics are largely due to changes in economic conditions and seasoning of the loan portfolio. On at least a quarterly basis, loans are internally risk-rated based on individual credit criteria, including loan type, loan structures (including balloon and bullet structures common in the Company’s Leveraged Finance and Real Estate cash flow loans), borrower industry, payment capacity, location and quality of collateral if any (including the Company’s Real Estate loans). Borrowers provide the Company with financial information on either a monthly or quarterly basis. Ratings, corresponding assumed default rates and assumed loss severities are dynamically updated to reflect any changes in borrower condition and/or profile. For Leveraged Finance loans and Equipment Finance loans and leases (prior to the sale of the latter), the data set used to construct probabilities of default in its allowance for loan losses model, Moody’s CRD Private Firm Database, primarily contains middle market loans that share attributes similar to the Company’s loans. The Company also considers the quality of the loan terms and lender protections in determining a loan loss in the event of default. For Real Estate loans, the Company employs two mechanisms to capture the impact of industry and economic conditions. First, a loan’s risk rating, and thereby its assumed default likelihood, can be adjusted to account for overall commercial real estate market conditions. Second, to the extent that economic or industry trends adversely affect a substandard rated borrower’s loan-to-value ratio enough to impact its repayment ability, the Company applies a stress multiplier to the loan’s probability of default. The multiplier is designed to account for default characteristics that are difficult to quantify when market conditions cause commercial real estate prices to decline. Prior to the sale of Business Credit, the Company utilized a proprietary model to risk rate the loans on a monthly basis. This model captured the impact of changes in industry and economic conditions as well as changes in the quality of the borrower’s collateral and financial performance to assign a final risk rating. The Company also evaluated historical net loss trends by risk rating from a comprehensive industry database covering more than twenty-five years of experience of the majority of the asset based lenders operating in the United States. Based upon the monthly risk rating from the model, the reserve was adjusted to reflect the historical average for expected loss from the industry database. The Company periodically reviews its allowance for credit loss methodology to assess any necessary adjustments based upon changing economic and capital market conditions. If the Company determines that changes in its allowance for credit losses methodology are advisable, as a result of changes in the economic environment or otherwise, the revised allowance methodology may result in higher or lower levels of allowance. Additionally, when determining the amount of the general allowance, the Company supplements the base amount with an environmental reserve amount which is governed by a score card system comprised of seven risk factors. The risk factors are designed based on those outlined in the Comptrollers of the Currency’s Allowance for Loan and Lease Losses Handbook. The Company also performs a ratio analysis of comparable money center banks, regional banks and finance companies. While the Company does not rely on this peer group comparison to set the level of allowance for credit losses, use of the peer group does assist management in identifying market trends and serves as an overall reasonableness check on the allowance for credit losses computation. A summary of the activity in the allowance for credit losses is as follows: Three Months Ended September 30, 2017 Leveraged Finance Real Estate Total ($ in thousands) Balance, beginning of period $ 47,192 $ 92 $ 47,284 Provision (reversal) for credit losses—general (2,369 ) 1 (2,368 ) Provision for credit losses—specific 3,862 — 3,862 Loans charged off, net of recoveries (8,560 ) — (8,560 ) Balance, end of period $ 40,125 $ 93 $ 40,218 Balance, end of period—specific $ 11,665 $ — $ 11,665 Balance, end of period—general $ 28,460 $ 93 $ 28,553 Average balance of impaired loans $ 131,888 $ — $ 131,888 Interest recognized from impaired loans $ 1,499 $ — $ 1,499 Loans (1) Loans individually evaluated with specific allowance $ 100,085 $ — $ 100,085 Loans individually evaluated with no specific allowance 53,631 — 53,631 Loans collectively evaluated with general allowance 2,488,393 10,716 2,499,109 Total loans $ 2,642,109 $ 10,716 $ 2,652,825 (1) Excludes $407.6 million of Leveraged Finance loans which the Company elected to record at fair value. Nine Months Ended September 30, 2017 Leveraged Finance Real Estate Total ($ in thousands) Balance, beginning of period $ 51,316 $ 92 $ 51,408 Provision for credit losses—general (3,085 ) 1 (3,084 ) Provision for credit losses—specific 13,424 — 13,424 Loans charged off, net of recoveries (21,530 ) — (21,530 ) Balance, end of period $ 40,125 $ 93 $ 40,218 Balance, end of period—specific $ 11,665 $ — $ 11,665 Balance, end of period—general $ 28,460 $ 93 $ 28,553 Average balance of impaired loans $ 149,552 $ — $ 149,552 Interest recognized from impaired loans $ 5,400 $ — $ 5,400 Three Months Ended September 30, 2016 Leveraged Finance Real Estate Equipment Finance Total ($ in thousands) Balance, beginning of period $ 62,645 $ 91 $ 1,307 $ 64,043 Provision for credit losses—general 349 1 (14 ) 336 Provision for credit losses—specific 3,234 — — 3,234 Reclass of Equipment Finance to Assets held-for-sale — — (1,293 ) (1,293 ) Loans charged off, net of recoveries 46 — — 46 Balance, end of period $ 66,274 $ 92 $ — $ 66,366 Balance, end of period—specific $ 36,160 $ — $ — $ 36,160 Balance, end of period—general $ 30,114 $ 92 $ — $ 30,206 Average balance of impaired loans $ 154,695 $ 21,942 $ — $ 176,637 Average net book value of impaired leases $ — $ — $ 623 $ 623 Interest recognized from impaired loans $ 1,627 $ 296 $ — $ 1,923 Loans (1) Loans individually evaluated with specific allowance $ 105,099 $ — $ — $ 105,099 Loans individually evaluated with no specific allowance 44,598 7,160 — 51,758 Loans collectively evaluated with general allowance 2,725,028 10,582 — 2,735,610 Total loans $ 2,874,725 $ 17,742 $ — $ 2,892,467 (1) Excludes $389.3 million of Leveraged Finance loans which the Company elected to record at fair value. Nine Months Ended September 30, 2016 Leveraged Finance Business Credit Real Estate Equipment Finance Total ($ in thousands) Balance, beginning of period $ 54,788 $ 1,991 $ 656 $ 1,291 $ 58,726 Provision for credit losses—general 1,774 (172 ) 1,010 2 2,614 Provision for credit losses—specific 18,115 — 4,177 — 22,292 Reversal due to sale of Business Credit — (1,819 ) — (1,293 ) (3,112 ) Loans charged off, net of recoveries (8,403 ) — (5,751 ) — (14,154 ) Balance, end of period $ 66,274 $ — $ 92 $ — $ 66,366 Balance, end of period—specific $ 36,160 $ — $ — $ — $ 36,160 Balance, end of period—general $ 30,114 $ — $ 92 $ — $ 30,206 Average balance of impaired loans $ 169,690 $ — $ 30,699 $ — $ 200,389 Average net book value of impaired leases $ — $ — $ — $ 698 $ 698 Interest recognized from impaired loans $ 6,606 $ — $ 1,128 $ 12 $ 7,746 Included in the allowance for credit losses at September 30, 2017 and December 31, 2016 is an allowance for unfunded commitments of $0.5 million, which is recorded as a component of other liabilities on the Company’s consolidated balance sheet with changes recorded in the provision for credit losses on the Company’s consolidated statement of operations. The methodology for determining the allowance for unfunded commitments is consistent with the methodology for determining the allowance for loan losses. During the nine months ended September 30, 2017, the Company recorded a total provision for credit losses of $10.3 million. The Company decreased its allowance for credit losses to $40.2 million as of September 30, 2017 from $51.4 million at December 31, 2016. The general allowance for credit losses covers probable incurred losses in the Company’s loan portfolio with respect to loans for which no specific impairment has been identified. When a loan is classified as impaired, the loan is evaluated for a specific allowance and a specific provision may be recorded, thereby removing it from consideration under the general component of the allowance analysis. Loans that are deemed to be uncollectible are charged off and deducted from the allowance, and recoveries on loans previously charged off are netted against loans charged off. A specific provision for credit losses is recorded with respect to impaired loans for which it is probable that the Company will be unable to collect all amounts due in accordance with the contractual terms of the loan agreement for which there is impairment recognized. The outstanding balance of impaired loans, which include all of the outstanding balances of the Company’s delinquent loans and its troubled debt restructurings, as a percentage of “Loans, net” was 5% and 4% as of September 30, 2017 and December 31, 2016, respectively.

Restricted Cash

Restricted Cash	9 Months Ended
	Sep. 30, 2017
Cash And Cash Equivalents [Abstract]
Restricted Cash	Note 5. Restricted Cash Restricted cash as of September 30, 2017 and December 31, 2016 was as follows: September 30, 2017 December 31, 2016 ($ in thousands) Collections on loans pledged to credit facilities $ 49,694 $ 43,822 Principal and interest collections on loans held in trust and prefunding amounts 199,156 216,501 Customer escrow accounts 2,803 2,320 Total $ 251,653 $ 262,643 As of September 30, 2017, the Company had the ability to use $170.7 million of restricted cash to fund new or existing loans.

Investments in Debt Securities,

Investments in Debt Securities, Available-for-Sale	9 Months Ended
	Sep. 30, 2017
Investments Debt And Equity Securities [Abstract]
Investments in Debt Securities, Available-for-Sale	Note 6. Investments in Debt Securities, Available-for-Sale Amortized cost of investments in debt securities as of September 30, 2017 and December 31, 2016 was as follows: September 30, 2017 December 31, 2016 ($ in thousands) Investments in debt securities—gross $ 182,422 $ 132,180 Unamortized discount (9,974 ) (6,743 ) Investments in debt securities—amortized cost $ 172,448 $ 125,437 At September 30, 2017 and December 31, 2016 investments in non-NewStar managed issuers totaled $74.0 million and $75.8 million, respectively. The amortized cost, gross unrealized holding gains, gross unrealized holding losses, and fair value of available-for-sale securities at September 30, 2017 and December 31, 2016 were as follows: Amortized cost Gross unrealized holding gains Gross unrealized holding losses Fair value ($ in thousands) September 30, 2017 Collateralized loan obligations $ 172,448 $ 4,350 $ (961 ) $ 175,837 Investment in debt securities $ 172,448 $ 4,350 $ (961 ) $ 175,837 Amortized cost Gross unrealized holding gains Gross unrealized holding losses Fair value ($ in thousands) December 31, 2016 Collateralized loan obligations $ 125,437 $ 286 $ (6,416 ) $ 119,307 Investment in debt securities $ 125,437 $ 286 $ (6,416 ) $ 119,307 During the three and nine months ended September 30, 2017, the Company purchased $23.1 million and $52.7 million of debt securities, $21.5 million were purchased to satisfy EU risk retention rules, redeemed a $5.9 million par value investment in debt securities, and made a $0.5 million par paydown. During the nine months ended September 30, 2016, the Company did not purchase or sell any debt securities available for sale and a $6.0 million investment in debt securities was redeemed at par. The Company did not record any net “Other-Than-Temporary Impairment” charges during the three and nine months ended September 30, 2017. The following is an analysis of the continuous periods during which the Company has held investment positions which were carried at an unrealized loss as of September 30, 2017 and December 31, 2016: September 30, 2017 Less than 12 Months Greater than or Equal to 12 Months Total ($ in thousands) Number of positions 6 2 8 Fair value $ 19,895 $ 3,519 $ 23,414 Amortized cost 20,598 3,777 24,375 Unrealized loss $ (703 ) $ (258 ) $ (961 ) December 31, 2016 Less than 12 Months Greater than or Equal to 12 Months Total ($ in thousands) Number of positions 3 17 20 Fair value $ 4,811 $ 68,737 $ 73,548 Amortized cost 4,885 75,079 79,964 Unrealized loss $ (74 ) $ (6,342 ) $ (6,416 ) As a result of the Company’s evaluation of the securities, management concluded that the unrealized losses at September 30, 2017 and December 31, 2016 were caused by changes in market prices driven by interest rates and credit spreads. The Company’s evaluation of impairment include quotes from third party pricing services, adjustments to prepayment speeds, delinquency, an analysis of expected cash flows, interest rates, market discount rates, other contract terms, and the timing and level of losses on the loans and leases within the underlying trusts. At September 30, 2017, the Company has determined that it is not more likely than not that it will be required to sell the securities before the Company recovers its amortized cost basis in the security. The Company has also determined that there has not been an adverse change in the cash flows expected to be collected. Based upon the Company’s impairment review process, and the Company’s ability and intent to hold these securities until maturity or a recovery of fair value, the decline in the value of these investments is not considered to be “Other Than Temporary.” Maturities of debt securities classified as available-for-sale were as follows at September 30, 2017 and December 31, 2016: September 30, 2017 December 31, 2016 Amortized cost Fair value Amortized cost Fair value ($ in thousands) Available-for-sale: Due one year or less $ — $ — $ 91 $ 20 Due after one year through five years — — — — Due after five years through ten years 120,183 123,592 53,177 48,404 Due after ten years through fifteen years 52,265 52,245 72,169 70,883 Total $ 172,448 $ 175,837 $ 125,437 $ 119,307 Actual maturities of debt securities may differ from those presented above since certain obligations amortize and provide the issuer of the individual debt securities the right to call or prepay the obligation prior to the scheduled final stated maturity without penalty.

Borrowings

Borrowings	9 Months Ended
	Sep. 30, 2017
Debt Disclosure [Abstract]
Borrowings	Note 7. Borrowings Credit Facilities As of September 30, 2017 the Company had two credit facilities through certain of its wholly owned subsidiaries: (i) a $615.0 million credit facility with syndicated lenders agented by Wells Fargo Bank, National Association (“Wells Fargo”) to fund leveraged finance loans, and (ii) a $250.0 million credit facility with Citibank, N.A. (“Citibank”) to fund leveraged finance loans. The Company must comply with various covenants under these facilities. The breach of certain of these covenants could result in a termination event and the exercise of remedies if not cured. At September 30, 2017, the Company was in compliance with all such covenants. These covenants are customary and include, but are not limited to, failure to service debt obligations, failure to meet liquidity covenants and tangible net worth covenants, and failure to remain within prescribed facility portfolio delinquency, charge-off levels, and overcollateralization tests. The Company’s $615.0 million credit facility with syndicated lenders agented by Wells Fargo to fund leveraged finance loans had an outstanding balance of $368.9 million and unamortized deferred financing fees of $5.0 million as of September 30, 2017. Interest on this facility accrues at a variable rate per annum. The facility matures on August 10, 2020. The facility provides for a revolving reinvestment period which ends on August 10, 2018, with a two-year amortization period. The Company’s $250.0 million credit facility with Citibank to fund leveraged finance loans had a $95.0 million outstanding balance and unamortized deferred financing fees of $1.9 million as of September 30, 2017. Interest on this facility accrues at a variable rate per annum. The facility matures on May 5, 2020. It provides for a revolving reinvestment period which ends on May 5, 2018, with a two-year amortization period. Senior notes On April 22, 2015, the Company issued $300.0 million in aggregate principal amount of 7.25% Senior Notes due 2020 (the “2020 Notes”). On November 9, 2015, the Company issued an additional $80.0 million in aggregate principal amount of 2020 Notes, at a debt discount of $0.8 million which will amortize over the life of the 2020 Notes. The Company used a portion of the net proceeds from the April notes offering to repay in full its corporate credit facility with Fortress Credit Corp. The 2020 Notes mature on May 1, 2020, and bear interest at a rate of 7.25% per annum, which is payable semi-annually on May 1 and November 1 of each year. On or after May 1, 2017, the Company may redeem the 2020 Notes, in whole or in part, at redemption prices specified in the 2020 Notes plus accrued and unpaid interest thereon. In addition, if the Company undergoes a change of control, the Company will be required to make an offer to purchase each holder’s 2020 Notes at a price equal to 101% of the principal amount of the 2020 Notes, plus accrued and unpaid interest. As of September 30, 2017, unamortized deferred financing fees were $4.3 million. Subordinated notes On December 4, 2014, the Company completed the initial closing of an investment of long-term capital from funds sponsored by Franklin Square Capital Partners ("Franklin Square") and sub-advised by GSO Capital Partners at which the Franklin Square funds purchased $200.0 million of 10-year subordinated notes (the "Subordinated Notes"), which rank junior to the Company's existing and future senior debt. During 2015, the Company drew an additional $75 million of these Subordinated Notes. The Company drew the remaining $25 million in January 2016. The Subordinated Notes were recorded at par less the initial relative fair value of the warrants issued in connection with the investment in December 2014 and January 2015, which was $48.6 million as of September 30, 2017 and $53.7 million as of December 31, 2016. The debt discount will amortize over the life of the notes and will be recorded as non-cash interest expense as the Subordinated Notes accrete to par value. As of September 30, 2017, unamortized deferred financing fees were $4.4 million. The Subordinated Notes bear interest at 8.25% and include a Payment-in-Kind ("PIK Toggle") feature that allows the Company, at its option, to elect to have interest accrued at a rate of 8.75% added to the principal of the Subordinated Notes instead of paying it in cash. The Subordinated Notes have a ten-year term and mature on December 4, 2024. They are callable during the first three years with payment of a make-whole premium. The prepayment premium decreases to 103% and 101% after the third and fourth anniversaries of the closing, respectively. They are callable at par after December 4, 2019. Beginning on December 5, 2019, the Company is required to make a cash payment of principal plus accrued interest in an amount required to prevent the Subordinated Notes from being treated as an "Applicable High Yield Discount Obligation" within the meaning of Section 163(i)(1) of the Internal Revenue Code of 1986, as amended. Events of default under the Subordinated Notes include failure to pay interest or principal when due subject to applicable grace periods, material uncured breaches of the terms of the Subordinated Notes, and bankruptcy/insolvency events. Term Debt On July 20, 2017, in connection with the acquisition of FSCM, the Company assumed the indebtedness associated with the Natixis credit agreement dated September 28, 2015. The proceeds under this credit agreement were used solely to purchase the interests held in a FSCM-managed CLO to comply with risk retention requirements. The credit agreement matures on September 29, 2027. The following table sets forth selected information with respect to the Natixis Term Debt: Outstanding balance September 30, 2017 Interest rate ($ in thousands) Natixis Term Debt Class A-1 Notes $ 12,972 Libor + 1.92% Class A-2 Notes 1,597 Libor + 2.81% Class B Notes 1,552 Libor + 3.72% Class C Notes 852 Libor + 4.85% $ 16,973 Term Debt Securitizations 2012-2 CLO. On December 18, 2012, the Company completed a term debt securitization transaction. In conjunction with this transaction the Company established a separate single-purpose bankruptcy-remote subsidiary, NewStar Commercial Loan Funding 2012-2 LLC (the “2012-2 CLO”) and sold and contributed $325.9 million in loans and investments (including unfunded commitments), or portions thereof, to the 2012-2 CLO. The Company remains the servicer of the loans. Simultaneously with the initial sale and contribution, the 2012-2 CLO issued $263.3 million of notes to institutional investors. The Company retained $62.6 million, comprising 100% of the 2012-2 CLO’s membership interests, Class E notes, Class F notes, and subordinated notes. On June 12, 2015, the Company sold 100% of the 2012-2 CLO’s Class E Notes totaling $16.3 million to institutional investors. At September 30, 2017, the $142.3 million of outstanding drawn notes were collateralized by the specific loans and investments, principal collection account cash and principal payment receivables totaling $188.6 million. At September 30, 2017, unamortized deferred financing fees were $0.2 million. The 2012-2 CLO permitted reinvestment of collateral principal repayments for a three-year period which ended in January 2016. The Company receives a loan collateral management fee and excess interest spread. The Company also receives payments with respect to the classes of notes it owns in accordance with the transaction documents. The Company expects to receive a principal distribution as owner of the membership interests when the term debt is retired. If loan collateral in the 2012-2 CLO is in default under the terms of the indenture, the excess interest spread from the 2012-2 CLO may not be distributed if the overcollateralization ratio, or other collateral quality tests, are not satisfied. The following table sets forth selected information with respect to the 2012-2 CLO: Notes originally issued Outstanding balance September 30, 2017 Interest rate Legal final maturity ($ in thousands) 2012-2 CLO Class A $ 190,700 $ 53,383 Libor+1.90% January Class B 26,000 26,000 Libor+3.25% January 20, 2023 Class C 35,200 35,200 Libor+4.25% January 20, 2023 Class D 11,400 11,400 Libor+6.25% January 20, 2023 Class E 16,300 16,300 Libor+6.75% January 20, 2023 $ 279,600 $ 142,283 2014-1 CLO. On April 17, 2014, the Company completed a term debt securitization transaction through its separate single-purpose bankruptcy-remote subsidiary, NewStar Commercial Loan Funding 2014-1 LLC (the “2014-1 CLO”) and sold and contributed $249.6 million in loans and investments (including unfunded commitments), or portions thereof, to the 2014-1 CLO. The Company remains the servicer of the loans. Simultaneously with the initial sale and contribution, the 2014-1 CLO issued $289.5 million of notes to institutional investors. The Company retained $58.9 million, comprising 100% of the 2014-1 CLO’s membership interests, Class E notes, Class F notes, and subordinated notes. At September 30, 2017, the $289.5 million of outstanding drawn notes were collateralized by the specific loans and investments, principal collection account cash and principal payment receivables totaling $348.4 million. At September 30, 2017, unamortized deferred financing fees were $1.5 million. The 2014-1 CLO permits reinvestment of collateral principal repayments for a four-year period ending in April 2018. Should the Company determine that reinvestment of collateral principal repayments are impractical in light of market conditions or if collateral principal repayments are not reinvested within a prescribed timeframe, such funds may be used to repay the outstanding notes. Subject to the terms of the Indenture, the Company has the right to redeem the 2014-1 CLO following the expiration of the non-call period which occurred on the payment date in April 2016. The Company receives a loan collateral management fee and excess interest spread. The Company also receives payments with respect to the classes of notes it owns in accordance with the transaction documents. The Company expects to receive a principal distribution as owner of the membership interests when the term debt is retired. If loan collateral in the 2014-1 CLO is in default under the terms of the indenture, the excess interest spread from the 2014-1 CLO may not be distributed if the overcollateralization ratio, or other collateral quality tests, are not satisfied. The following table sets forth selected information with respect to the 2014-1 CLO: Notes originally issued Outstanding balance September 30, 2017 Interest rate Legal final maturity ($ in thousands) 2014-1 CLO Class A $ 202,500 $ 202,500 Libor+1.80% April Class B-1 20,000 20,000 Libor+2.60% April 20, 2025 Class B-2 13,250 13,250 (1) April 20, 2025 Class C 30,250 30,250 Libor+3.60% April 20, 2025 Class D 23,500 23,500 Libor+4.75% April 20, 2025 $ 289,500 $ 289,500 (1) Class B-2 Notes accrue interest at a fixed rate of 4.902%. 2015-1 CLO. On March 20, 2015, the Company completed a term debt securitization transaction through its separate single-purpose bankruptcy-remote subsidiary, NewStar Commercial Loan Funding 2015-1 LLC (the “2015-1 CLO”) and sold and contributed $336.3 million in loans and investments (including unfunded commitments), or portions thereof, to the 2015-1 CLO. The Company remains the servicer of the loans. Simultaneously with the initial sale and contribution, the 2015-1 CLO issued $410.3 million of notes to institutional investors. The Company retained $85.8 million, comprising 100% of the 2015-1 CLO’s membership interests and subordinated notes. At September 30, 2017, the $410.3 million of outstanding drawn notes were collateralized by the specific loans and investments, principal collection account cash and principal payment receivables totaling $496.1 million. At September 30, 2017, unamortized deferred financing fees were $2.6 million. The 2015-1 CLO permits reinvestment of collateral principal repayments for a four-year period ending in April 2019. Should the Company determine that reinvestment of collateral principal repayments are impractical in light of market conditions or if collateral principal repayments are not reinvested within a prescribed timeframe, such funds may be used to repay the outstanding notes. Subject to the terms of the Indenture, the Company has the right to redeem the 2015-1 CLO following the expiration of the non-call period which occurred on the payment date in April 2017. The Company receives a loan collateral management fee and excess interest spread. The Company also receives payments with respect to the classes of notes it owns in accordance with the transaction documents. The Company expects to receive a principal distribution as owner of the membership interests when the term debt is retired. If loan collateral in the 2015-1 CLO is in default under the terms of the indenture, the excess interest spread from the 2015-1 CLO may not be distributed if the overcollateralization ratio, or other collateral quality tests, are not satisfied. The following table sets forth selected information with respect to the 2015-1 CLO: Notes originally issued Outstanding balance September 30, 2017 Interest rate Legal final maturity ($ in thousands) 2015-1 CLO Class A-1 $ 253,500 $ 253,500 Libor+1.80% January 20, 2027 Class A-2 35,000 35,000 (1) January 20, 2027 Class B 50,000 50,000 Libor+2.80% January 20, 2027 Class C 38,500 38,500 Libor+3.85% January 20, 2027 Class D 33,250 33,250 Libor+5.50% January 20, 2027 $ 410,250 $ 410,250 (1) Class A-2 Notes accrue interest at a spread over Libor of 1.65% from the closing date to, but excluding March 20, 2017, and 2.00% thereafter. 2015-2 CLO. On September 15, 2015, the Company completed a term debt securitization transaction through its separate single-purpose bankruptcy-remote subsidiary, NewStar Commercial Loan Funding 2015-2 LLC (the “2015-2 CLO”) and sold and contributed $298.4 million in loans and investments (including unfunded commitments), or portions thereof, to the 2015-2 CLO. The Company remains the servicer of the loans. Simultaneously with the initial sale and contribution, the 2015-2 CLO issued $327.8 million of notes to institutional investors. The Company retained $70.1 million, comprising 100% of the 2015-2 CLO’s membership interests and a portion of the Class E notes. At September 30, 2017, the $327.8 million of outstanding drawn notes were collateralized by the specific loans and investments, principal collection account cash and principal payment receivables totaling $397.8 million. At September 30, 2017, unamortized deferred financing fees were $2.4 million. The 2015-2 CLO permits reinvestment of collateral principal repayments for a four-year period ending in August 2019. Should the Company determine that reinvestment of collateral principal repayments are impractical in light of market conditions or if collateral principal repayments are not reinvested within a prescribed timeframe, such funds may be used to repay the outstanding notes. Subject to the terms of the Indenture, the Company has the right to redeem the 2015-2 CLO following the expiration of the non-call period which occurred on the payment date in August 2017. The Company receives a loan collateral management fee and excess interest spread. The Company also receives payments with respect to the classes of notes it owns in accordance with the transaction documents. The Company expects to receive a principal distribution as owner of the membership interests when the term debt is retired. If loan collateral in the 2015-2 CLO is in default under the terms of the indenture, the excess interest spread from the 2015-2 CLO may not be distributed if the overcollateralization ratio, or other collateral quality tests, are not satisfied. The following table sets forth selected information with respect to the 2015-2 CLO: Notes originally issued Outstanding balance September 30, 2017 Interest rate Legal final maturity ($ in thousands) 2015-2 CLO Class A-1 $ 205,000 $ 205,000 Libor+2.00% August 25, 2027 Class A-2 23,000 23,000 (1) August 25, 2027 Class B 40,000 40,000 Libor+2.90% August 25, 2027 Class C 26,250 26,250 Libor+3.95% August 25, 2027 Class D 28,500 28,500 Libor+5.25% August 25, 2027 Class E 5,000 5,000 Libor+7.50% August 25, 2027 $ 327,750 $ 327,750 (1) Class A-2 Notes accrue interest at a fixed rate of 3.461%. 2016-1 CLO. On March 2, 2016, the Company completed a term debt securitization transaction through its separate single-purpose bankruptcy-remote subsidiary, NewStar Commercial Loan Funding 2016-1 LLC (the “2016-1 CLO”) and sold and contributed $247.3 million in loans and investments (including unfunded commitments), or portions thereof, to the 2016-1 CLO. The Company remains the servicer of the loans. Simultaneously with the initial sale and contribution, the 2016-1 CLO issued $255.8 million of notes to institutional investors. The Company retained $92.2 million, comprising 100% of the 2016-1 CLO’s membership interests, and the Class D and Class E notes. At September 30, 2017, the $263.3 million of outstanding drawn notes were collateralized by the specific loans and investments, principal collection account cash and principal payment receivables totaling $348.0 million. At September 30, 2017, unamortized deferred financing fees were $2.1 million. The 2016-1 CLO permits reinvestment of collateral principal repayments for a four-year period ending in February 2020. Should the Company determine that reinvestment of collateral principal repayments are impractical in light of market conditions or if collateral principal repayments are not reinvested within a prescribed timeframe, such funds may be used to repay the outstanding notes. Subject to the terms of the Indenture, the Company has the right to redeem the 2016-1 CLO following the expiration of the non-call period on the payment date in February 2018. The following table sets forth selected information with respect to the 2016-1 CLO: Notes originally issued Outstanding balance September 30, 2017 Interest rate Legal final maturity ($ in thousands) 2016-1 CLO Class A-1 $ 176,500 $ 176,500 Libor+2.30% February 25, 2028 Class A-2 20,000 20,000 (1) February 25, 2028 Class B 36,750 36,750 Libor+3.75% February 25, 2028 Class C 22,500 22,500 Libor+5.40% February 25, 2028 Class D 7,500 7,500 Libor+5.50% February 25, 2028 $ 263,250 $ 263,250 (1) Class A-2 Notes accrue interest at a fixed rate of 3.44%. Arch Street CLO. On September 15, 2016, NewStar Capital LLC completed a $409.8 million broadly syndicated loan securitization. The notes offered in the collateralized loan obligation (“Arch Street CLO”) were issued by Arch Street CLO, Ltd., an exempted company incorporated under the laws of the Cayman Islands, and (with the exception of the Class E and F notes) by Arch Street CLO, LLC, a Delaware limited liability company (each a subsidiary of NewStar Capital and collectively, “Arch Street”). The Arch Street CLO notes are backed by a diversified portfolio of broadly syndicated loans purchased and serviced by the Company. Investors purchased approximately $370.3 million of the Arch Street CLO notes, representing approximately 90.4% of the total capitalization of Arch Street. The Company retained all of the Class F notes and subordinated notes which together totaled approximately $39.5 million, representing approximately 9.6% of the total capitalization of Arch Street. At September 30, 2017, the outstanding note balance was $367.8 million and unamortized deferred financing fees were $3.7 million. The reinvestment period is expected to end in October 2020 and scheduled to mature in October 2028. The Company receives a loan collateral management fee and excess interest spread. The Company also receives payments with respect to the classes of notes it owns in accordance with the transaction documents. The Company expects to receive a principal distribution as owner of the membership interests when the term debt is retired. If loan collateral in the Arch Street CLO is in default under the terms of the indenture, the excess interest spread from the Arch Street CLO may not be distributed if the overcollateralization ratio, or other collateral quality tests, are not satisfied. The following table sets forth selected information with respect to the Arch Street CLO: Notes originally issued Outstanding balance September 30, 2017 Interest rate Legal final maturity ($ in thousands) Arch Street CLO Class X $ 2,500 $ - Libor+1.25% October 20, 2028 Class A 256,000 256,000 Libor+1.65% October 20, 2028 Class B 48,000 48,000 Libor+2.24% October 20, 2028 Class C 20,000 20,000 Libor+3.00% October 20, 2028 Class D 22,750 22,750 Libor+4.20% October 20, 2028 Class E 21,000 21,000 Libor+6.95% October 20, 2028 $ 370,250 $ 367,750 2017-1 CLO. On March 20, 2017, the Company completed a term debt securitization transaction through its separate single-purpose bankruptcy-remote subsidiary, NewStar Commercial Loan Funding 2017-1 LLC (the “2017-1 CLO”). This securitization was a refinance of the NewStar Commercial Loan Funding 2013-1 LLC term debt securitization completed on September 11, 2013. The Company remains the servicer of the loans. In connection with the refinance the Company accelerated and recognized deferred financing fees of $0.3 million related to the 2013-1 CLO. Simultaneously with the refinance, the 2017-1 CLO issued $328.0 million of replacement notes to institutional investors. The Company retained the Class E-N replacement notes and all of the equity which together totaled $69.3 million. At September 30, 2017, the $303.0 million of outstanding drawn replacement notes were collateralized by the specific loans and investments, principal collection account cash and principal payment receivables totaling $372.3 million. At September 30, 2017, unamortized deferred financing fees were $3.0 million. The reinvestment period is expected to end in March 2019 and the replacement notes are scheduled to mature in October 2027. Should the Company determine that reinvestment of collateral principal repayments are impractical in light of market conditions or if collateral principal repayments are not reinvested within a prescribed timeframe, such funds may be used to repay the outstanding notes. Subject to the terms of the Indenture, the Company has the right to redeem the 2017-1 CLO following the expiration of the non-call period on the payment date in March 2019. The Company receives a loan collateral management fee and excess interest spread. The Company also receives payments with respect to the classes of notes it owns in accordance with the transaction documents. The Company expects to receive a principal distribution as owner of the membership interests when the term debt is retired. If loan collateral in the 2017-1 CLO is in default under the terms of the indenture, the excess interest spread from the 2017-1 CLO may not be distributed if the overcollateralization ratio, or other collateral quality tests, are not satisfied. The following table sets forth selected information with respect to the 2017-1 CLO: Notes originally issued Outstanding balance September 30, 2017 Interest rate Legal final maturity ($ in thousands) 2017-1 CLO Class A-T-N $ 207,000 $ 207,000 Libor+1.78% September Class A-R-N 25,000 - Libor+1.78% September Class B-N 40,000 40,000 Libor+2.50% September Class C-N 32,000 32,000 Libor+3.50% September Class D-N 24,000 24,000 Libor+5.10% September $ 328,000 $ 303,000 2013-1 CLO. On March 20, 2017, the Company refinanced the 2013-1 LLC and issued the 2017-1 CLO Replacement Notes. The Company accelerated and recognized deferred financing fees of $0.3 million related to the refinancing of the 2013-1 CLO.

Repurchase Agreements

Repurchase Agreements	9 Months Ended
	Sep. 30, 2017
Banking And Thrift [Abstract]
Repurchase Agreements	Note 8. Repurchase Agreements The Company has entered into a repurchase transaction with Deutsche Bank AG, pursuant to the terms of a Global Master Repurchase Agreement (2000 version), dated as of February 13, 2015 between Deutsche Bank AG and NS Bond Funding I LLC (the “Deutsche Bank Repurchase Agreement”). Pursuant to the Deutsche Bank Repurchase Agreement, Deutsche Bank AG will purchase securities and simultaneously agree to sell the securities back to the Company at a specified date. Under the terms of the Deutsche Bank Repurchase Agreement, the Company is required at all times to maintain a level of overcollateralization for the obligations, which is maintained through daily margining. As of September 30, 2017, there was no outstanding balance under the Deutsche Bank Repurchase Agreement. The Company has made certain representations and warranties and is required to comply with various covenants and requirements customary for financing arrangements of this nature. The Company has entered into a repurchase transaction with Citigroup Global Markets, pursuant to the terms of a Global Master Repurchase Agreement (1996 version), dated as of March 16, 2015 between Citigroup Global Markets and NS Loan Originator LLC (the “Citigroup Repurchase Agreement”). Pursuant to the Citigroup Repurchase Agreement, Citigroup Global Markets will purchase securities and simultaneously agree to sell the securities back to the Company at a specified date. Under the terms of the Citigroup Repurchase Agreement, the Company is required at all times to maintain a level of overcollateralization for the obligations, which is maintained through daily margining. As of September 30, 2017, the outstanding balance was $49.6 million. The Company has made certain representations and warranties and is required to comply with various covenants and requirements customary for financing arrangements of this nature. The Company has entered into a repurchase transaction with JP Morgan Chase Bank pursuant to the terms of a Global Master Repurchase Agreement (1996 version), dated as of May 1, 2015 between JP Morgan Chase Bank and NS Bond Funding II LLC (the “JP Morgan Repurchase Agreement”). Pursuant to the JP Morgan Repurchase Agreement, JP Morgan Chase Bank will purchase securities and simultaneously agree to sell the securities back to the Company at a specified date. Under the terms of the JP Morgan Repurchase Agreement, the Company is required at all times to maintain a level of overcollateralization for the obligations, which is maintained through daily margining. As of September 30, 2017, the outstanding balance was $29.1 million. The Company has made certain representations and warranties and is required to comply with various covenants and requirements customary for financing arrangements of this nature. The Company has entered into a repurchase transaction with Natixis Securities Americas LLC pursuant to the terms of a Global Master Repurchase Agreement (2000 version), dated as of October 14, 2015 between Natixis Securities Americas LLC and NS Bond Funding III LLC (the “Natixis Repurchase Agreement”). Pursuant to the Natixis Repurchase Agreement, Natixis Securities Americas LLC will purchase securities and simultaneously agree to sell the securities back to the Company at a specified date. Under the terms of the Natixis Repurchase Agreement, the Company is required at all times to maintain a level of overcollateralization for the obligations, which is maintained through daily margining. As of September 30, 2017, the outstanding balance was $1.9 million. The Company has made certain representations and warranties and is required to comply with various covenants and requirements customary for financing arrangements of this nature.

Stockholders' Equity

Stockholders' Equity	9 Months Ended
	Sep. 30, 2017
Equity [Abstract]
Stockholders' Equity	Note 9. Stockholders’ Equity Stockholders’ Equity As of September 30, 2017 and December 31, 2016, the Company’s authorized capital consists of preferred and common stock and the following was authorized and outstanding: September 30, 2017 December 31, 2016 Shares authorized Shares outstanding Shares authorized Shares outstanding (In thousands) Preferred stock 5,000 — 5,000 — Common stock 145,000 41,481 145,000 42,820 Preferred Stock The Company’s authorized capital stock includes 5,000,000 shares of preferred stock with a par value of $0.01 per share, all of which remain undesignated. Common Stock On December 9, 2016, the Company’s Board of Directors authorized the repurchase of up to $30.0 million of the Company’s common stock from time to time on the open market or in privately negotiated transactions. On February 14, 2017, our Board of Directors declared a quarterly cash dividend of $0.02 per share which was paid on March 17, 2017. On May 2, 2017, the Board of Directors declared a quarterly cash dividend of $0.02 per share which was paid on June 15, 2017 . On July 31, 2017, the Board of Directors declared a quarterly cash dividend of $0.02 per share which was paid on September 15, 2017 to stockholders of record on August 29, 2017. Warrants On January 23, 2015, the Company completed its December 4, 2014 issuance of warrants as part of the strategic relationship with Franklin Square Capital Partners (“Franklin Square”). The Company issued the second tranche of warrants to purchase 2,500,000 shares of its common stock subject to the same terms as the warrants that were issued on December 4, 2014, bringing the total warrants to purchase shares of common stock to 12,000,000. The terms of the warrants contain standard adjustments to the exercise price and warrant shares to adjust for the effect of certain distributions, including cash dividends. No adjustments are required until cumulative adjustments would result in a one percent change to the exercise price or number of warrant shares. To date, the cash dividends declared and paid by the Company have not resulted in any adjustment to the warrants’ exercise price or the number of shares underlying the warrants, because such distributions have not exceeded the minimum adjustment amounts. Restricted Stock During the nine months ended September 30, 2017, the Company issued 284,241 shares of restricted stock to certain employees of the Company pursuant to the Company’s 2006 Incentive Plan, as amended and 56,698 shares of restricted stock to certain members of its Board of Directors. The fair value of the shares of restricted stock is equal to the closing price of the Company’s stock on the date of issuance. The shares of restricted stock issued to employees of the Company vest in three equal installments on each of the first three anniversaries of the date of grant. Restricted stock activity for the nine months ended September 30, 2017 was as follows: Shares Grant-date fair value ($ in thousands) Non-vested as of December 31, 2016 840,834 $ 6,564 Granted 340,939 3,350 Vested (384,473 ) (3,209 ) Forfeited (7,333 ) (65 ) Non-vested as of September 30, 2017 789,967 $ 6,640 The Company’s compensation expense related to restricted stock was $0.9 million and $2.6 million, respectively, for the three and nine months ended September 30, 2017 and $1.0 million and $2.8 million, respectively, for the three and nine months ended September 30, 2016. The unrecognized compensation cost of $2.9 million at September 30, 2017 is expected to be recognized over the next three years. Stock Options Under the Company’s 2006 Incentive Plan, the Company’s compensation committee may grant options to purchase shares of common stock. Stock options may either be incentive stock options (“ISOs”) or non-qualified stock options. ISOs may only be granted to officers and employees. The compensation committee will, with regard to each stock option, determine the number of shares subject to the stock option, the manner and time of exercise, vesting, and the exercise price, which will not be less than 100% of the fair market value of the common stock on the date of the grant. The shares of common stock issuable upon exercise of options or other awards or upon grant of any other award may be either previously authorized but unissued shares or treasury shares. Stock option activity for the nine months ended September 30, 2017 was as follows: Options Outstanding as of December 31, 2016 421,692 Granted — Exercised (286,692 ) Forfeited (10,000 ) Outstanding as of September 30, 2017 125,000 Vested and exercisable as of September 30, 2017 125,000 As of September 30, 2017 and December 31, 2016, the Company has recognized all compensation costs related to options granted.

Earnings Per Share

Earnings Per Share	9 Months Ended
	Sep. 30, 2017
Earnings Per Share [Abstract]
Earnings Per Share	Note 10. Earnings Per Share The Company utilizes the two-class method to calculate earnings per share. The two-class method allocates net income to each class of common stock and participating security. Unvested share-based payment awards granted to certain employees and board members entitle holders to same rights as outstanding and vested common stock. These securities are considered to be participating securities and are included in the allocation for computing earnings per share under this method. Income is allocated to common shareholders and participating securities under the two-class method based upon the proportion of each to the total weighted average shares available. The computations of basic and diluted income per share for the three and nine months ended September 30, 2017 and 2016 are as follows: Three Months Ended September 30, Nine Months Ended September 30, 2017 2016 2017 2016 (In thousands) Numerator: Net income to common shareholders $ 4,585 $ 8,644 $ 10,119 $ 17,894 Net income allocated to participating securities - basic and diluted 87 157 191 302 Net income allocated to common shareholders - basic and diluted 4,498 8,487 9,928 17,592 Denominator: Denominator for basic earnings per common share 40,786 45,812 41,269 46,216 Denominator for diluted earnings per common share: Denominator for basic earnings per common share 40,786 45,812 41,269 46,216 Potentially dilutive securities - options 21 — 20 — Total weighted average diluted shares 40,807 45,812 41,289 46,216 Earnings per common share Basic $ 0.11 $ 0.19 $ 0.24 $ 0.38 Diluted $ 0.11 $ 0.19 $ 0.24 $ 0.38 Warrants to purchase 12,000,000 shares of common stock were not included in the computation of earnings per share for the three and nine months ended September 30, 2017 and 2016 due to the fact that the effect would be anti-dilutive. Stock options representing 741,845 shares were not included in the computation of earnings per share for the nine months ended September 30, 2016 due to the fact that the effect would be anti-dilutive.

Variable Interest Entities

Variable Interest Entities	9 Months Ended
	Sep. 30, 2017
Organization Consolidation And Presentation Of Financial Statements [Abstract]
Variable Interest Entities	Note 11. Variable Interest Entities The Company sponsors the formation of various entities that are considered to be VIEs. The majority of these VIEs were formed to issue term debt securitizations. The assets of the VIEs are primarily comprised of senior secured loans and the liabilities are primarily comprised of debt. The Company's determination of whether it is the primary beneficiary of the VIE is based in part on an assessment of whether or not the Company is exposed to the majority of the risks and rewards of the entity. In instances where the Company retains a significant portion of the equity and remains the servicer of the loans, it was determined that the Company has the power to direct the activities that most significantly impact the economic performance of these VIEs. Additionally, the Company determined that the potential fees that we could receive directly or indirectly from these VIEs represent rights to returns that could potentially be significant to the VIEs. As a result, the Company was deemed the primary beneficiary and therefore has consolidated these entities. Liabilities of the consolidated VIEs are disclosed in Note 7. Unconsolidated VIEs In July 2017, NewStar acquired Fifth Street CLO Management LLC, which was rebranded and now operates as NewStar Commercial Loan Originator II LLC, a wholly owned subsidiary of the Company. The purchase included contracts to manage two off balance sheet middle market CLOs, which have been renamed NewStar Exeter Fund CLO LLC (“Exeter Fund”) and NewStar Fairfield Fund CLO LTD (“Fairfield Fund”). The Company holds $3.9 million of Class F and subordinated notes of Exeter Fund and $21.5 million (vertical strip) of the notes of Fairfield Fund. Interests in the Fairfield Fund were retained to satisfy EU risk retention rules. The Company has determined that it is not the primary beneficiary of the either the Exeter Fund or Fairfield Fund and will not consolidate the operating results or statements of financial position; however, the Company has determined that it has a variable interest in the both the Exeter Fund and Fairfield Fund as it holds notes of the securitization. On April 18, 2017, NewStar refinanced its managed credit fund, Longfellow Place CLO, Ltd. (the “Longfellow Fund”), under a $516.9 million term debt securitization. The Longfellow Fund is a credit fund established in February 2013 to finance the purchase of a broadly syndicated bank loan portfolio through the issuance of debt and equity. To comply with EU risk retention rules, the Company holds 5% of each class of notes in the securitization (vertical strip), totaling $27.5 million. The Company has determined that it is not the primary beneficiary of the Longfellow Fund and will not consolidate the Longfellow Fund’s operating results or statements of financial position; however, the Company has determined that it has a variable interest in the Longfellow Fund as it holds notes of the securitization. In November 2016, NewStar closed a new managed credit fund, NewStar Berkeley Fund CLO LLC (the “Berkeley Fund”), a $505.0 million term debt securitization. The Berkeley Fund is the fourth credit fund established by the Company to co-invest in directly originated middle market commercial loans. To comply with EU risk retention rules, the Company holds 5% of each class of notes in the securitization (vertical strip), totaling $25.3 million. The Company has determined that it is not the primary beneficiary of the Berkeley Fund and will not consolidate the Berkeley Fund’s operating results or statements of financial position; however, the Company has determined that it has a variable interest in the Berkeley Fund as it holds notes of the securitization. In January 2015, NewStar closed a new managed credit fund, NewStar Clarendon Fund CLO LLC (the “Clarendon Fund”), a $400.0 million term debt securitization. The Clarendon Fund is the third credit fund established by the Company to co-invest in directly originated middle market commercial loans. To comply with EU risk retention rules, the Company holds 5% of each class of notes in the securitization (vertical strip), totaling $20.4 million. The Company has determined that it is not the primary beneficiary of the Clarendon Fund and will not consolidate the Clarendon Fund’s operating results or statements of financial position; however, the Company has determined that it has a variable interest in the Clarendon Fund as it holds notes of the securitization. In October 2015, NewStar acquired FOC Partners, which now operates as NewStar Capital. At acquisition, NewStar Capital was the investment manager for six collateralized loan obligations and two sponsored funds and provided discretionary services to a series of separately managed accounts. The Company determined that it was not the primary beneficiary of any of acquired CLOs, sponsored funds or separately managed accounts; however, the Company determined that it had a variable interest in the Secured Value sponsored fund as it holds approximately one percent of the interest of the fund. The Secured Value sponsored fund was liquated on September 29, 2017. The following table sets forth the information with respect to the unconsolidated VIEs for which the Company holds a variable interest in as of September 30, 2017 and December 31, 2016: September 30, 2017 December 31, 2016 ($ in thousands) Unconsolidated VIE assets $ 2,104,050 $ 912,900 Unconsolidated VIE liabilities 1,903,200 810,030 Equity interest included on the Consolidated Balance Sheet 103,602 50,386 Maximum risk of loss (1) 105,570 50,794 (1) Includes equity investment the Company has made, or is required to make, and any earned but uncollected management and incentive fees. The Company does not record performance and incentive allocations until the respective measurement period has ended.

Financial Instruments with Off-

Financial Instruments with Off-Balance Sheet Risk	9 Months Ended
	Sep. 30, 2017
Commitments And Contingencies Disclosure [Abstract]
Financial Instruments with Off-Balance Sheet Risk	Note 12. Financial Instruments with Off-Balance Sheet Risk The Company is party to financial instruments with off-balance sheet risk in the normal course of business to meet the financing needs of its borrowers. These financial instruments include unfunded commitments and standby letters of credit. The instruments involve, to varying degrees, elements of credit risk in excess of the amount recognized in the consolidated balance sheet. The contract or notional amounts of those instruments reflect the extent of involvement we have in particular classes of financial instruments. The Company’s exposure to credit loss in the event of nonperformance by the other party to the financial instrument for standby letters of credit is represented by the contractual amount of those instruments. The Company uses the same credit policies in making commitments and conditional obligations as it does for on-balance sheet instruments. Unused lines of credit are commitments to lend to a borrower if certain conditions have been met. These commitments generally have fixed expiration dates or other termination clauses and may require payment of a fee. Because certain commitments may expire without being drawn upon, the total commitment amounts do not necessarily represent future cash requirements. The Company evaluates each borrower’s creditworthiness on a case-by-case basis. The amount of collateral required is based on factors that include management’s credit evaluation of the borrower and the borrower’s compliance with financial covenants. Due to their fluctuating nature, the Company cannot know with certainty the aggregate amounts that will be required to fund its unfunded commitments. The aggregate amount of these unfunded commitments may exceed the Company’s available funds. The credit risk involved in issuing letters of credit is essentially the same as that involved in extending credit to our borrowers. Standby letters of credit are conditional commitments issued by us to guarantee the performance by a borrower to a third party. Financial instruments with off-balance sheet risk are summarized as follows: September 30, 2017 December 31, 2016 ($ in thousands) Unused lines of credit $ 303,861 $ 326,051 Standby letters of credit 6,776 8,239

Total Return Swap

Total Return Swap	9 Months Ended
	Sep. 30, 2017
Derivative Instruments And Hedging Activities Disclosure [Abstract]
Total Return Swap	Note 13. Total Return Swap The Company was a participant in a Total Return Swap (“TRS”), which matured on March 31, 2016. We acted as the manager of the TRS and selected the specific loans to be subject to the TRS. The TRS did not qualify for hedge accounting treatment as it did not offset the risks of another investment position. The underlying referenced loan portfolio of the TRS was primarily large, liquid, broadly syndicated senior secure floating rate loans with Citibank, N.A. as the counterparty. The TRS effectively added leverage to the Company's portfolio by providing economic benefits of the loans subject to the TRS, despite the fact that such loans were not directly owned the Company, in return for an interest-type payment to Citibank. On December 4, 2014, NewStar TRS I LLC, a newly-formed wholly owned subsidiary of the Company, entered into the TRS. The initial maximum market value (determined at the time such loan becomes subject to the TRS) of the portfolio of loans subject to the TRS was $75.0 million. On December 15, 2014, we entered into an amendment to the TRS that increased the maximum value to $125.0 million, on March 2, 2015, we entered into an amendment that increased the maximum value to $150.0 million, and on July 14, 2015, we entered into an additional amendment to the TRS that increased the maximum value to $175.0 million. Upon maturity of the TRS on March 31, 2016, the Company purchased $138.9 million of the loans in the referenced portfolio. The majority of these loans were purchased to fund future CLOs of the Company and its wholly owned subsidiary NewStar Capital. The Company recorded these loans at fair value which was determined by using the At March 31, 2016, the receivable and realized loss on the total return swap on the consolidated balance sheet and consolidated statements of operations consisted of the following: Net Receivable Net Realized Gains/(Losses) ($ in thousands) Interest income from TRS portfolio $ — $ 2,355 TRS interest expense — 848 Realized loss on TRS — (6,122 ) Due to Citibank (10,984 ) — TRS receivable 1,145 — The fair value of the TRS was reflected as an unrealized gain or loss on the total return swap on the consolidated balance sheet, within other assets or liabilities. The change in value of the TRS was reflected in the consolidated statements of operations as loss on total return swap. The Company's obligations under the TRS were non-recourse to it, and its exposure was limited to the value of the cash collateral which fluctuated from time to time depending on the market value of the underlying loans. The Company was required to cash collateralize a specified percentage of each loan included under the TRS in accordance with margin requirements. As of September 30, 2017 and December 31, 2016, the Company had no cash collateral on deposit with Citibank. The Company paid interest to Citibank for each loan at a rate equal to one-month LIBOR plus 1.60% per annum. Upon the termination or repayment of any loan under the TRS Agreement, the Company would deduct the appreciation of such loan's value from any interest owed to Citibank or pay the depreciation amount to Citibank in addition to remaining interest payments.

Fair Value

Fair Value	9 Months Ended
	Sep. 30, 2017
Fair Value Disclosures [Abstract]
Fair Value	Note 14. Fair Value ASC 820, Fair Value Measurements and disclosures • Level 1 – inputs to the valuation methodology are quoted prices (unadjusted) for identical assets or liabilities in active markets. • Level 2 – inputs to the valuation methodology include quoted prices for similar assets and liabilities in active markets, and inputs that are observable for the asset or liability, either directly or indirectly, for substantially the full term of the financial instrument. • Level 3 – inputs to the valuation methodology are unobservable and significant to the fair value measurement. A financial instrument’s categorization within the valuation hierarchy is based upon the lowest level of input that is significant to the fair value measurement. Items Recorded at Fair Value on a Recurring Basis Investments in debt securities, available-for-sale Investments in debt securities available-for-sale are recorded at fair value on a recurring basis. The fair value measurement of investments in debt securities is based on third party pricing services or by using internally developed financial models. For securities in less liquid markets where there is limited activity and little transparency around broker quotes used to value such securities, the Company classifies securities valued using broker quotes as Level 3. If quoted prices are not available, then fair value is estimated by using internally developed financial models. These securities are not actively traded and require a private sale, and the valuation involves application of significant management judgment. Inputs into the model-based valuations can include changes in market indexes, selling prices of similar securities, management’s assumptions related to the credit rating of the security, prepayment assumptions and other factors such as credit loss assumptions and management’s assessment of the current market conditions. Such securities are classified as Level 3, as the valuation models are based on significant inputs that are unobservable in the market. Loans Loans designated to credit funds managed by NewStar Capital are recorded at fair value on a recurring basis. The Company has elected to apply fair value option accounting to these loans which is consistent with the manner in which the credit funds are managed. The fair value of these loans is based on third party pricing services. These loans are classified as Level 2. During the three months and nine months ended September 30, 2017, the Company recorded $0.9 million and $6.8 million, respectively, of losses from the change in fair value. Items Measured at Fair Value on a Nonrecurring Basis Collateral dependent impaired loans Collateral dependent loans that are deemed to be impaired are valued based upon the fair value of the underlying collateral. For collateral dependent loans for which repayment is dependent on the sale of the collateral, management adjusts the fair value for estimated costs to sell. For collateral dependent loans for which repayment is dependent on the operation of the collateral, management may also adjust values to reflect estimated market value declines or apply other discounts to appraised values. Collateral dependent impaired loans are categorized as Level 3. During the nine months ended September 30, 2017, the Company did not record any specific allowance for credit losses related to “Collateral dependent impaired loans” measured at fair value. During 2016, the Company recorded $4.3 million of specific allowance for credit losses related to “Collateral dependent impaired loans” measured at fair value at December 31, 2016, of which $4.2 million was subsequently charged off when the impaired loans were transferred to the held-for-sale portfolio. Loans held-for-sale Loans held-for-sale are carried at the lower of cost or fair value. Loans held-for-sale measured at fair value consist of loans that have had credit downgrades and/or have remained in the loans held-for-sale portfolio for a significant period of time. When fair value is determined to be the carrying value, the fair values of these loans are obtained through a third party pricing service or by using internally developed financial models. Inputs into the model-based valuations can include changes in market indexes, selling prices of similar loans, management’s assumption related to the credit rating of the loan, prepayment assumptions and other factors, such as credit loss assumptions. Where quoted market prices are obtained through dealer quotes, broker indicative prices or online posts, loans held-for-sale are classified as Level 2. Loans held-for-sale are classified as Level 3 in instances where valuation models are based on significant inputs that are unobservable in the market. During the three months and nine months ended September 30, 2017, the Company recorded a loss of $0.5 million and a loss of $0.6 million, respectively, related to “Loans, held-for-sale” measured at fair value. During 2016, the Company recorded a $2.4 million gain related to “Loans, held-for-sale” measured at fair value. Other real estate owned or repossessed assets The fair value is estimated using one of several methods, including collateral value, market value of similar properties, liquidation value and discounted cash flows. M anagement may adjust the fair value for estimated costs to sell or adjust values to reflect estimated market value declines or apply other discounts to values. During 2016, the Company recorded a $0.3 million expense to write down other real estate owned to fair value. The following table presents recorded amounts of assets and liabilities measured at fair value on a recurring and nonrecurring basis as of September 30, 2017, by caption in the consolidated balance sheet and by ASC 820 valuation hierarchy. Quoted Prices in Active Markets for Identical Assets (Level 1) Significant Other Observable Inputs (Level 2) Significant Unobservable Inputs (Level 3) Total Carrying Value in Consolidated Balance Sheet ($ in thousands) Recurring Basis: Assets: Investments in debt securities, available-for-sale $ — $ — $ 175,837 $ 175,837 Loans — 407,465 — 407,465 Total assets recorded at fair value on a recurring basis $ — $ 407,465 $ 175,837 $ 583,302 Nonrecurring Basis: Assets: Loans held-for-sale $ — $ 25,219 $ 10,538 $ 35,757 Other real estate owned/repossessed assets — — 15,600 15,600 Total assets recorded at fair value on a nonrecurring basis $ — $ 25,219 $ 26,138 $ 51,357 The following table presents recorded amounts of assets and liabilities measured at fair value on a recurring and nonrecurring basis as of December 31, 2016, by caption in the consolidated balance sheet and by ASC 820 valuation hierarchy. Quoted Prices in Active Markets for Identical (Level 1) Significant Other Observable Inputs (Level 2) Significant Unobservable Inputs (Level 3) Total Carrying Value in Consolidated Balance Sheet ($ in thousands) Recurring Basis: Assets: Investments in debt securities, available-for-sale $ — $ — $ 119,307 $ 119,307 Loans — 403,745 — 403,745 Total assets recorded at fair value on a recurring basis $ — $ 403,745 $ 119,307 $ 523,052 Liabilities: Contingent liability — — 1,350 $ 1,350 Total liabilities recorded at fair value on a recurring basis $ — $ — $ 1,350 $ 1,350 Nonrecurring Basis: Assets: Loans held-for-sale $ — $ 4,465 $ 2,459 $ 6,924 Other real estate owned/repossessed assets — — 15,750 15,750 Total assets recorded at fair value on a nonrecurring basis $ — $ 4,465 $ 18,209 $ 22,674 The following table presents a summary of significant unobservable inputs and valuation techniques of the Company’s Level 3 fair value measurements at September 30, 2017. Fair Valuation Techniques Unobservable Input Range ($ in thousands) Financial assets: Investments in debt securities, available-for-sale $ 175,837 Third-party Pricing Loans held-for-sale 10,538 Market comparables Cost to Sell 3%-7% Valuation model Marketability discount 5%-30% Other real estate/repossessed assets 15,600 Appraisal Cost to sell 3%- 7% Total Assets: $ 201,975 The following table presents a summary of significant unobservable inputs and valuation techniques of the Company’s Level 3 fair value measurements at December 31, 2016. Fair value Valuation Techniques Unobservable Input Range ($ in thousands) Financial assets: Investments in debt securities, available-for-sale $ 119,307 Third-party pricing Pricing Loans held-for-sale 2,459 Market comparables Cost to sell 3% - Valuation model Marketability discount 5%-30% Other real estate owned/repossessed assets 15,750 Appraisal Cost to sell 3% - 7% Total Assets: $ 137,516 Financial liabilities: Contingent liability 1,350 Valuation model PoD/LGD Total Liability: $ 1,350 Changes in Level 3 recurring fair value measurements The table below illustrates the change in balance sheet amounts during the three and nine months ended September 30, 2017 and 2016 (including the change in fair value), for financial instruments measured on a recurring basis and classified by the Company as Level 3 in the valuation hierarchy. When a determination is made to classify a financial instrument as Level 3, the determination is based upon the significance of the unobservable parameters to the overall fair value measurement. However, Level 3 financial instruments typically include, in addition to the unobservable or Level 3 components, observable components (that is, components that are actively quoted and can be validated to external sources); accordingly, the gains and losses in the table below include changes in fair value due in part to observable factors that are part of the valuation methodology. The Company did not transfer any financial instruments in or out of Level 1, 2, or 3 during the three and nine months ended September 30, 2017 and 2016. As of June 30, 2017 it was determined that the contingent liability was no longer measured at fair value. For the three months ended September 30, 2017: Investments Debt Securities, Available-for-sale ($ Balance as of June 30, 2017 $ 151,426 Total gains or losses (realized/unrealized) Included in earnings 161 Included in other comprehensive income (loss) 1,488 Purchases 23,069 Issuances — Settlements (307 ) Balance as of September 30, 2017 $ 175,837 For the three months ended September 30, 2016: Investments Debt Securities, Available-for-sale ($ Balance as of June 30, 2016 $ 91,400 Total gains or losses (realized/unrealized) Included in earnings 342 Included in other comprehensive income (loss) 5,072 Purchases — Issuances — Settlements (6,000 ) Balance as of September 30, 2016 $ 90,814 For the nine months ended September 30, 2017: Investments Debt Securities, Available-for-sale ($ Balance as of December 31, 2016 $ 119,307 Total gains or losses (realized/unrealized) Included in earnings 539 Included in other comprehensive income (loss) 9,535 Purchases 52,682 Issuances — Settlements (6,226 ) Balance as of September 30, 2017 $ 175,837 For the nine months ended September 30, 2016: Investments Debt Securities, Available-for-sale ($ Balance as of December 31, 2015 $ 94,177 Total gains or losses (realized/unrealized) Included in earnings 655 Included in other comprehensive income (loss) 1,982 Purchases — Issuances — Settlements (6,000 ) Balance as of September 30, 2016 $ 90,814 The following table presents the carrying amounts, estimated fair values and placement in the fair value hierarchy of the Company’s financial instruments at September 30, 2017 and December 31, 2016. The fair value of a financial instrument is the amount at which the instrument could be exchanged in a current transaction between willing parties. The carrying amounts shown in the table are included in the consolidated balance sheets under the indicated captions. Estimated Fair Value of Financial Instruments September 30, 2017 Fair Value Measurements Carrying amount Fair Level 1 Level 2 Level 3 ($ in thousands) Financial assets: Investments in debt securities available-for-sale 175,837 175,837 175,837 Loans held-for-sale, net 371,941 376,833 196,977 179,856 Loans, net 2,995,997 2,995,619 407,465 2,588,154 Other assets 20,383 20,383 20,383 Financial liabilities: Credit facilities, net $ 456,961 $ 456,961 $ 456,961 Term debt, net 16,973 16,973 16,973 Term debt securitizations, net 2,085,733 2,162,702 2,162,702 Senior notes, net 375,287 390,450 390,450 Subordinated notes, net 246,929 325,001 325,001 Repurchase agreements, net 80,569 80,569 80,569 Other liabilities 1,000 1,000 1,000 Estimated Fair Value of Financial Instruments December 31, 2016 Fair Value Measurements Carrying amount Fair Level 1 Level 2 Level 3 ($ in thousands) Financial assets: Investments in debt securities available-for-sale 119,307 119,307 119,307 Loans held-for-sale, net 144,060 145,406 69,875 75,531 Loans, net 3,239,191 3,241,910 403,745 2,838,165 Other assets 15,954 15,954 15,954 Financial liabilities: Credit facilities, net $ 445,493 $ 445,493 $ 445,493 Term debt securitizations, net 2,195,064 2,230,102 2,230,102 Senior notes, net 373,919 380,000 380,000 Subordinated notes, net 241,390 303,916 303,916 Repurchase agreements, net 55,046 55,046 55,046 Other liabilities 1,350 1,350 1,350 Valuation of Other Financial Instruments The methodologies for estimating the fair value of financial instruments that are measured at fair value on a recurring or nonrecurring basis are discussed above. The methodologies for other financial instruments are discussed below. Credit facilities, net: Due to the adjustable rate nature of the borrowings and comparable market spreads, the fair values of the credit facilities are estimated to approximate their carrying values. Rates currently are comparable to those offered to the Company for similar debt instruments of comparable maturities by the Company’s lenders. Term debt, net: The fair value of the term debt is estimated to approximate the carrying value. Rates currently are comparable to those offered to the Company for similar debt instruments of comparable maturities by the Company’s lenders. Term debt securitizations, net: The fair value was determined by applying prevailing term debt securitization market interest rates to the Company’s current term debt securitization structure. Repurchase agreements, net: The fair value was determined by applying prevailing repurchase agreement market interest rates to the Company’s current repurchase agreement structure. Senior notes, net: The fair value was based on available quoted market prices. Subordinated notes, net: The fair value was estimated as the present value of expected future cash flows discounted at market interest rates on similar debt instruments, issued by companies with comparable credit ratings. Other assets/other liabilities : Comprised of non-public investments carried within other assets at $20.4 million and $16.0 million, as of September 30, 2017 and December 31, 2016, respectively. These investments are in the form of equity or warrants and are obtained as part of the loan origination process. The investments are initially recorded at cost and reviewed quarterly. If the fair value is less than cost then the investment is written down to fair value with the necessary adjustment recorded through current earnings. Fair value is determined using internally developed valuation models. Where sufficient data exists, a market approach method is utilized to estimate the current value of the underlying company. The estimated fair value of the underlying securities for warrants requiring valuation at fair value is adjusted for discounts related to lack of liquidity. The Company classifies equity and warrants as Level 3. The contingent liability for potential indemnification obligations from the sale of Equipment Finance was included in other liabilities as of September 30, 2017 and December 31, 2016. Its fair value was based on periodic portfolio review and various assumptions used by management. The Company classifies the contingent liability as Level 3.

Segment Reporting

Segment Reporting	9 Months Ended
	Sep. 30, 2017
Segment Reporting [Abstract]
Segment Reporting	Note 15. Segment Reporting Beginning in 2016, the Company has two reportable segments, Commercial Lending and Asset Management. Segment information is derived from the internal reporting system utilized by management. Revenues and expenses for segments reflect those revenue and expenses which can be specifically identified and have been assigned based on internally developed allocation methods. Results may be restated, when necessary, to reflect changes in organizational structure or allocation methodology. Any changes in allocations that may affect the reported results of any business segment will not affect the consolidated financial position or results of operations of the Company as a whole. Commercial Lending The Commercial Lending segment represents our direct lending activities which are focused on providing a range of flexible senior secured debt options to mid-sized companies with annual cash flow (EBITDA) typically between $15 million and $50 million owned by private equity investment funds and managed by established professional alternative asset managers. The size of financing commitments depends on various factors, including the type of loan, the credit characteristics of the borrower, the economic characteristics of the loan, and the Company's role in the transaction. The Company may retain these loans on its balance sheet or allocate these loans to off balance sheet managed credit funds managed by the Company or other lenders. By allocating these loans to the Company's off balance sheet managed credit funds and other lenders, it is able to provide larger financing commitments to its customers and generate fee income, while limiting its risk exposure to single borrowers. Asset Management The Asset Management segment represents our investment advisory activities which include credit funds managed by the Company and NewStar Capital. Credit funds managed by the Company focus on co-invest middle market loans originated through our leveraged finance lending platform, liquid tradeable credit and liquid loan strategies. NewStar Capital manages assets across a series of CLOs that invest primarily in broadly syndicated loans, as well as other sponsored funds and managed accounts that invest across various liquid, non-investment grade asset classes, including broadly syndicated loans and bonds. The following tables presents the statement of operations and total assets for the Company’s reportable segments: Three Months Ended September 30, 2017 Commercial Lending Asset Management Consolidated Total Net interest income: $ 14,495 $ 1,112 $ 15,607 Provision for loan losses 1,494 — 1,494 Net interest income after provision 13,001 1,112 14,113 Noninterest income: Management fees — 3,474 3,474 Performance fees — 70 70 Other lending fees 988 37 1,025 Gain on sale of loans and equipment 27 247 274 Other noninterest income (1) 1,837 (1,157 ) 680 Total noninterest income: 2,852 2,671 5,523 Non-interest expense 9,371 2,529 11,900 Income before income taxes $ 6,482 $ 1,254 $ 7,736 Income tax expense 3,151 Net income $ 4,585 (1) Includes fair value adjustments on Loans held-for-sale and fair value portfolio. Nine Months Ended September 30, 2017 Commercial Lending Asset Management Consolidated Total Net interest income: $ 41,136 $ 3,467 $ 44,603 Provision for loan losses 10,341 — 10,341 Net interest income after provision 30,795 3,467 34,262 Noninterest income: Management fees — 9,602 9,602 Performance fees — 1,415 1,415 Other lending fees 6,257 122 6,379 Gain on sale of loans and equipment 246 1,235 1,481 Other noninterest income (1) 5,146 (7,170 ) (2,024 ) Total noninterest income: 11,649 5,204 16,853 Non-interest expense 27,229 6,607 33,836 Income before income taxes $ 15,215 $ 2,064 $ 17,279 Income tax expense 7,160 Net income $ 10,119 (1) Includes fair value adjustments on Loans held-for-sale and fair value portfolio. Three months ended September 30, 2016 Commercial Lending Asset Management Consolidated Total ($ in thousands) Net interest income $ 24,135 $ 1,123 $ 25,258 Provision for loan losses 3,570 — 3,570 Net interest income after provision 20,565 1,123 21,688 Noninterest income: Management fees — 2,888 2,888 Performance fees — 465 465 Other lending fees 2,871 75 2,946 Gain on sale of loans and equipment 83 69 152 Other noninterest income (1) 1,059 3,456 4,515 Total Noninterest income: 4,013 6,953 10,966 Non-interest expense 14,833 3,236 18,069 Income before income taxes $ 9,745 $ 4,840 $ 14,585 Income tax expense 5,941 Net income $ 8,644 (1) Includes fair value adjustment on Loans held-for-sale. Nine months ended September 30, 2016 Commercial Lending Asset Management Consolidated Total ($ in thousands) Net interest income $ 65,752 $ 2,931 $ 68,683 Provision for loan losses 24,906 — 24,906 Net interest income after provision 40,846 2,931 43,777 Noninterest income: Management fees — 9,031 9,031 Performance fees — 1,306 1,306 Other lending fees 5,729 107 5,836 Gain on sale of loans and equipment 545 220 765 Other noninterest income (1) 13,819 3,720 17,539 Total Noninterest income: 20,093 14,384 34,477 Non-interest expense 40,027 7,950 47,977 Income before income taxes $ 20,912 $ 9,365 $ 30,277 Income tax expense 12,383 Net income $ 17,894 (1) Includes fair value adjustments on Loans held-for-sale and fair value portfolio. September 30, 2017 Commercial Lending Asset Management Total ($ in thousands) Loans and leases, gross (including loans at fair value of $407,465) $ 2,652,825 $ 407,465 $ 3,060,290 Loans held-for-sale, gross 375,560 — 375,560 Investments in debt securities, available-for-sale — 175,837 175,837 Other 314,780 76,167 390,947 Total Balance Sheet Assets 3,343,165 659,469 4,002,634 Illiquid Credit funds * — 2,018,397 2,018,397 Liquid/Tradeable Credit * — 1,541,582 1,541,582 Total Assets 3,343,165 4,219,448 7,562,613 Less: Non Managed assets (1) 314,780 66,193 380,973 Total Managed Assets $ 3,028,385 $ 4,153,255 $ 7,181,640 * Assets managed by the Company for the Illiquid Credit and Liquid/Tradeable Credit Funds are not assets of the Company and are not included in the Consolidated Total Assets as reflected in the Condensed Consolidated Balance Sheet. (1) Other less unamortized discount on investment in debt securities, available-for-sale. December 31, 2016 Commercial Lending Asset Management Total ($ in thousands) Loans and leases, gross (including loans at fair value of $403,745) $ 2,915,805 $ 403,745 $ 3,319,550 Loans held-for-sale, gross 145,966 — 145,966 Investments in debt securities, available-for-sale — 119,307 119,307 Other 374,851 80,918 455,769 Total Balance Sheet Assets 3,436,622 603,970 4,040,592 Illiquid Credit funds * — 1,314,690 1,314,690 Liquid/Tradeable Credit * — 1,833,607 1,833,607 Total Assets 3,436,622 3,752,267 7,188,889 Less: Non Managed assets (1) 374,851 74,175 449,026 Total Managed Assets $ 3,061,771 $ 3,678,092 $ 6,739,863 * Assets managed by the Company for the Illiquid Credit and Liquid/Tradeable Credit Funds are not assets of the Company and are not included in the Consolidated Total Assets as reflected in the Condensed Consolidated Balance Sheet. (1) Other less unamortized discount on investment in debt securities, available-for-sale.

Related-Party Transactions

Related-Party Transactions	9 Months Ended
	Sep. 30, 2017
Related Party Transactions [Abstract]
Related-Party Transactions	Note 16. Related-Party Transactions Pursuant to an Investment Management Agreement dated August 3, 2005, the Company serves as investment manager of the NewStar Credit Opportunities Fund, Ltd., a Cayman Islands exempted company limited by shares incorporated under the provisions of The Companies Law of the Cayman Islands. This Fund pays the Company a fee when cash is distributed to its investors. For the three and nine months ended September 30, 2017, the fund paid the Company $0.01 million, and for the three and nine months ended September 30, 2016, the Fund paid the Company zero and $0.01 million, respectively. Pursuant to a Collateral Management Agreement dated June 26, 2014, the Company serves as collateral manager of the Arlington Program. The Company is entitled to receive a fee, which will accrue quarterly based on the fee basis amount in arrears payable on each payment date. For the three and nine months ended September 30, 2017 the Arlington Program’s collateral management fee was $0.5 million and $1.5 million, respectively and for the three and nine months ended September 30, 2016, the Arlington Program’s collateral management fee was $0.5 million and $1.5 million, respectively. On January 15, 2015, the Company closed the NewStar Clarendon Fund CLO LLC (the “Clarendon Fund”), a $400.0 million term debt securitization. The Clarendon Fund is the third credit fund established by the Company to co-invest in directly originated middle market commercial loans. To comply with EU risk retention rules, the Company holds 5% of each class of note in the securitization, totaling $20.4 million. The Clarendon Fund employs an independent investment professional who is responsible for reviewing and approving investment recommendations made to the Clarendon Fund by the Company. The Company has determined that it is not the primary beneficiary of the Clarendon Fund and will not consolidate the Clarendon Fund’s operating results or statements of financial position. Pursuant to a Collateral Management Agreement dated January 15, 2015, the Company serves as collateral manager of the Clarendon Fund. The Company is entitled to receive a fee, which will accrue quarterly based on the fee basis amount in arrears payable on each payment date. For the three and nine months ended September 30, 2017, the Clarendon Fund’s collateral management fee was $0.5 million and $1.5 million, respectively and for the three and nine months ended September 30, 2016, the Clarendon Fund’s collateral management fee was $0.5 million and $1.5 million, respectively. On November 29, 2016, the Company closed the Berkeley Fund, a $505.0 million term debt securitization. The Berkeley Fund is the fourth credit fund established by the Company to co-invest in directly originated middle market commercial loans. To comply with EU risk retention rules, the Company holds 5% of each class of note in the securitization, totaling $25.3 million. The Berkeley Fund employs an independent investment professional who is responsible for investment decision making on behalf of the program. The Company has determined that it is not the primary beneficiary of the Berkeley Fund and will not consolidate the Berkeley Fund’s operating results or statements of financial position. Pursuant to a Collateral Management Agreement dated November 29, 2016, the Company serves as collateral manager of the Berkeley Fund. The Company is entitled to receive a fee, which will accrue quarterly based on the fee basis amount in arrears payable on each payment date. For the three and nine months ended September 30, 2017, the Berkeley Fund’s collateral management fee was $0.5 million and $1.6 million, respectively. On April 18, 2017, the Company refinanced its managed credit fund, Longfellow Place CLO Ltd. (the “Longfellow Fund”), under a $516.9 million term debt securitization. The Longfellow fund is a credit fund established in February 2013 to finance the purchase of a broadly syndicated bank loan portfolio through the issuance of debt and equity. To comply with EU risk retention rules, the Company holds 5% of each class of note in the securitization, totaling $27.5 million. The Company has determined that it is not the primary beneficiary of the Longfellow Fund and will not consolidate the Longfellow Fund’s operating results or statements of financial position. Pursuant to a Collateral Management Agreement dated January 15, 2015, the Company serves as collateral manager of the Longfellow Fund. The Company is entitled to receive a fee, which will accrue quarterly based on the fee basis amount in arrears payable on each payment date. For the three and nine months ended September 30, 2017, the Longfellow Fund’s collateral management fee was $0.4 million and $1.1 million , respectively. On July 20, 2017, the Company a cquired contracts to manage two off balance sheet middle market CLOs, which have been renamed to the Exeter Fund and Fairfield Fund, from FSCM. The Company also acquired $3.9 million of Class F and subordinated notes of the Exeter Fund and approximately 5% of each asset class of notes totaling $21.5 million of the Fairfield Fund. Interests in the Fairfield Fund were retained to comply with EU risk retention rules.

Subsequent Events

Subsequent Events	9 Months Ended
	Sep. 30, 2017
Subsequent Events [Abstract]
Subsequent Events	Note 17. Subsequent Events On October 16, 2017, the Company entered into an Agreement and Plan of Merger (the “Merger Agreement”) with First Eagle Holdings, Inc. (“First Eagle”), FE Holdco, LLC, a wholly-owned subsidiary of First Eagle (“FE Holdco”), and a newly formed wholly-owned merger subsidiary of FE Holdco, pursuant to which the merger subsidiary will be merged with and into the Company, with the Company surviving the merger as a wholly-owned subsidiary of FE Holdco. Subject to the terms and conditions set forth in the Merger Agreement, stockholders are expected to receive $11.44 in upfront cash and one non-transferable contingent value right (CVR) for each share of Company common stock held at closing of the transaction. Each CVR will entitle its holder to receive pro-rata distributions of any tax refunds received by the Company following the closing as a result of a carryback of the Company’s losses generated primarily from the sale of assets to the Asset Buyer (as defined below). The Company estimates these refunds to total $1.00 per share if the transaction closes in 2017, or $0.88 per share if the transaction closes in 2018. entered On November 1, 2017 , our Board of Directors declared a dividend of $0.02 per share, to be paid on December 15, 2017 to stockholders of record on November 29, 2017. 2012-1 CLO . On October 20, 2017, we called the 2012-2 CLO Trust and redeemed the notes at par. In conjunction with the redemption, we received a cash principal distribution of $22.6 million.

Summary of Significant Accoun27

Summary of Significant Accounting Policies (Policies)	9 Months Ended
	Sep. 30, 2017
Accounting Policies [Abstract]
Basis of Presentation	Basis of Presentation These interim condensed consolidated financial statements include the accounts of the Company and its subsidiaries and those variable interest entities (“VIEs”) where the Company is the primary beneficiary. These interim condensed consolidated financial statements have been prepared in accordance with accounting principles generally accepted in the United States of America ("GAAP") for interim financial information and pursuant to the requirements for reporting on Form 10-Q and Article 10 of Regulation S-X. Accordingly, they do not include all of the information and notes required by GAAP for complete financial statements. All significant intercompany transactions have been eliminated in consolidation. In the opinion of Management, all adjustments (consisting of normal recurring adjustments) considered necessary for the fair presentation of the interim condensed consolidated financial statements have been included. As discussed in Note 17, the Company entered into a definitive agreement with First Eagle Holdings, Inc. and certain of its direct and indirect subsidiaries, as a result of which the Company will become an indirect wholly-owned subsidiary of First Eagle. The closing of the transactions contemplated by the agreement is subject to the approval of our stockholders, regulatory approvals, and other conditions. As a result, none of the condensed consolidated financial statements and related disclosures in this Form 10-Q consider the potential impact of the pending merger and related transactions.
Principles of Consolidation	Principles of Consolidation The Company consolidates entities in which it, directly or indirectly, is determined to have a controlling financial interest under ASC Topic 810, as amended by ASU No. 2015-02, Consolidation – Amendments to the Consolidation Analysis, which revised the existing consolidation guidance and required the Company to re-evaluate whether to consolidate certain types of entities. Investments in Consolidated Variable Interest Entities The Company sponsors the formation of various entities that are considered to be VIEs. The majority of these VIEs were formed to issue term debt securitizations used to fund the Company’s lending activities. The assets of the VIEs are primarily comprised of senior secured loans and the liabilities are primarily comprised of asset backed securities. In instances where the Company retains 100% of the equity interests and services the loans, the Company is considered the primary beneficiary of the VIE and consolidates the entities. Investments in Unconsolidated Variable Interest Entities and Other Unconsolidated Entities The Company also holds variable interests in certain VIEs that are not consolidated because the Company is not considered the primary beneficiary, including its investments in certain managed credit funds and CLOs. The Company’s involvement with such entities is in the form of equity interests that the Company has deemed more than insignificant and/or asset management fees for services provided. In instances where the Company holds equity interests, those interests are held on our balance sheet and included in Investments in Debt Securities, Available-for-Sale. The Company manages a series of other entities and separately managed accounts for third parties. The Company receives fees for services performed with respect to such entities, which the Company has determined are not variable interests. These fees earned by the Company are included in asset management income. Investments in unconsolidated variable interest entities and other unconsolidated entities are referred to in this Quarterly Report as off balance sheet managed credit funds.
Prior Period Reclassification	Prior Period Reclassification Prior period amounts are reclassified wherever necessary to conform with current period presentation.
Recently Adopted Accounting Standards	Recently Adopted Accounting Standards In November 2015, the FASB issued ASU 2015-17, Income Taxes (Topic 740). In March 2016, the FASB issued ASU 2016-07, Simplifying the Transition to the Equity Method of Accounting (Topic 323) In March 2016, the FASB issued ASU 2016-09, Improvements to Employee Share-Based Payment Accounting (Topic 718) In December 2016, the FASB issued ASU 2016-19, Technical Corrections and Improvements In January 2017, the FASB issued ASU 2017-01, Business Combinations (Topic 805): Clarifying the Definition of a Business. ASU 2017-01 is
Issued Accounting Standards not yet Adopted	Issued Accounting Standards Not Yet Adopted In May 2014, the FASB issued ASU 2014-09, Revenue from Contracts with Customers (Topic 606). In January 2016, the FASB issued ASU 2016-01, Financial Instruments – Recognition and Measurement of Financial Assets and Financial Liabilities (Topic 825-10) In February 2016, the FASB issued ASU 2016-02, Leases (Topic 842) In June 2016, the FASB issued ASU 2016-13, Financial Instruments-Credit Losses (Topic 326) In August 2016, the FASB issued ASU 2016-15, Statement of Cash Flows (Topic 230). In October 2016, the FASB issued ASU 2016-17, Consolidation (Topic 810), Interest Held Through Related Parties That Are Under Common Control In November 2016, the FASB issued ASU 2016-18, Statement of Cash Flows (Topic 230): Restricted Cash. In January 2017, the FASB issued ASU 2017-04, Intangibles - Goodwill and Other (Topic 350): Simplifying the Test for Goodwill Impairment. In March 2017, the FASB issued ASU 2017-08, Receivables – Nonrefundable Fees and Other Costs (Topic 310): Premium Amortization on Purchased Callable Debt Securities.

Acquisition and Disposition A28

Acquisition and Disposition Activities (Tables)	9 Months Ended
	Sep. 30, 2017
Business Combinations [Abstract]
Schedule of Allocation of Purchase Price to Estimated Fair Value of Assets Acquired and Liabilities Assumed	Fair Value ($ in thousands) Assets Acquired Investment in available for sale securities $ 23,068 Identified intangible assets 5,394 Other assets 1,221 Total assets acquired $ 29,683 Liabilities Assumed Accrued expenses $ 125 Term Debt 12,973 Total Liabilities Assumed $ 13,098 Identified, net assets acquired $ 16,585

Loans Held-for-Sale, Loans, L29

Loans Held-for-Sale, Loans, Leases and Allowance for Credit Losses (Tables)	9 Months Ended
	Sep. 30, 2017
Receivables [Abstract]
Loans Held-for-Sale	As of September 30, 2017 and December 31, 2016, loans held-for-sale consisted of the following: September 30, 2017 December 31, 2016 ($ in thousands) Leveraged Finance $ 376,276 $ 146,126 Lower cost or market adjustment (716 ) (160 ) Gross loans held-for-sale 375,560 145,966 Deferred loan fees, net (3,619 ) (1,906 ) Loans held-for-sale, net $ 371,941 $ 144,060
Summary of Loans	As of September 30, 2017, and December 31, 2016, loans consisted of the following: September 30, 2017 December 31, 2016 ($ in thousands) Leveraged Finance (1) $ 3,049,574 $ 3,308,926 Real Estate 10,716 10,624 Gross loans 3,060,290 3,319,550 Deferred loan fees and discount, net (24,534 ) (29,423 ) Allowance for loan losses (39,759 ) (50,936 ) Total loans, net $ 2,995,997 $ 3,239,191 (1) Includes loans at fair value of $407.5 million and $403.7 million, respectively.
Summary of Impaired Loans	A summary of impaired loans is as follows: Investment, Net of Charge-offs Investment, Net of Unamortized Discount/Premium Unpaid Principal ($ in thousands) September 30, 2017 Impaired loans $ 153,716 $ 146,742 $ 179,471 December 31, 2016 Impaired loans $ 133,413 $ 126,839 $ 154,879 Recorded Investment Related Allowance for Credit Losses Recorded Investment, net, with a Related Allowance for Credit Losses Recorded Investment without a Related Allowance for Credit Losses Recorded Investment, net, without a Related Allowance for Credit Losses ($ in thousands) September 30, 2017 Impaired loans $ 100,085 $ 93,176 $ 53,631 $ 53,566 December 31, 2016 Impaired loans $ 73,499 $ 68,924 $ 59,914 $ 57,915
Evaluation Summary of Amortized Cost Portfolio and Allowance for Loan Losses by Impairment	Below is a summary of the Company’s evaluation of its amortized cost portfolio and allowance for loan losses by impairment methodology: Leveraged Finance Real Estate September 30, 2017 Investment Allowance Investment Allowance ($ in thousands) Collectively evaluated (1)(2) $ 2,488,393 $ 28,001 $ 10,716 $ 93 Individually evaluated (3) 153,716 11,665 — — Total $ 2,642,109 $ 39,666 $ 10,716 $ 93 Leveraged Finance Real Estate December 31, 2016 Investment Allowance Investment Allowance ($ in thousands) Collectively evaluated (1)(2) $ 2,771,768 $ 31,073 $ 10,624 $ 92 Individually evaluated (3) 133,413 19,771 — — Total $ 2,905,181 $ 50,844 $ 10,624 $ 92 (1) Represents loans collectively evaluated for impairment in accordance with ASC 450-20, Loss Contingencies, and pursuant to amendments by ASU 2010-20 regarding allowance for unimpaired loans. These loans had a weighted average risk rating of 5.3 and 5.2 at September 30, 2017 and December 31, 2016, respectively, based on the Company’s internally developed 12 point scale for the Leveraged Finance and Real Estate loans. (2) Excludes $407.5 million at September 30, 2017 and $403.7 million at December 31, 2016 of Leveraged Finance loans which the Company elected to record at fair value. (3) Represents loans individually evaluated for impairment in accordance with ASU 310-10, Receivables,
Summary of Company's Investment in Nonaccrual Loans	Below is a summary of the Company’s investment in nonaccrual loans. Recorded Investment in Nonaccrual Loans September 30, 2017 December ($ in thousands) Nonaccrual loans $ 103,819 $ 99,233 Less: Deferred loan fees (6,533 ) (6,485 ) Add back: Interest receivable 73 116 Total $ 97,359 $ 92,864
Summary of Types of Concessions with Respect to TDRs	A summary of the types of concessions that the Company made with respect to TDRs at September 30, 2017 and December 31, 2016 is provided below: Group I Group II ($ in thousands) September 30, 2017 $ 85,095 $ 54,392 December 31, 2016 $ 114,803 $ 77,061 Note: A loan may be included in both restructuring groups, but not repeated within each group.
Summary of the Company's Loans Newly Classified as TDR and Existing TDR Loans Subsequently Defaulted	Below is a summary of the Company’s loans which were newly classified as TDR and existing TDR loans which subsequently defaulted, in each during the periods presented As of the Three Months Ended September 30, 2017 Pre-Modification Outstanding Recorded Investment Post-Modification Outstanding Recorded Investment Investment in TDR Subsequently Defaulted ($ in thousands) Leveraged Finance $ 5,815 $ 5,277 $ 5,277 Total $ 5,815 $ 5,277 $ 5,277 As of the Nine Months Ended September 30, 2017 Pre-Modification Outstanding Recorded Investment Post-Modification Outstanding Recorded Investment Investment in TDR Subsequently Defaulted ($ in thousands) Leveraged Finance $ 5,815 $ 5,277 $ 34,735 Total $ 5,815 $ 5,277 $ 34,735 As of the Three Months Ended September 30, 2016 Pre-Modification Outstanding Recorded Investment Post-Modification Outstanding Recorded Investment Investment in TDR Subsequently Defaulted ($ in thousands) Leveraged Finance $ 8,372 $ 8,473 $ — Real Estate — — — Total $ 8,372 $ 8,473 $ — As of the Nine Months Ended September 30, 2016 Pre-Modification Outstanding Recorded Investment Post-Modification Outstanding Recorded Investment Investment in TDR Subsequently Defaulted ($ in thousands) Leveraged Finance $ 10,147 $ 9,781 $ — Real Estate (1) — — 4,483 Total $ 10,147 $ 9,781 $ 4,483 (1) Amount reflects charge-off on an impaired Real Estate TDR that was taken prior to transfer to held-for-sale.
Breakdown of Troubled Debt Restructurings	The following sets forth a breakdown of troubled debt restructurings at September 30, 2017 and December 31, 2016: As of September 30, 2017 Accrual Status For the nine months ($ in thousands) Loan Type Accruing Nonaccrual TDR Balance Specific Allowance Charged-off Leveraged Finance $ 16,025 $ 69,070 $ 85,095 $ 5,279 $ 21,554 Total $ 16,025 $ 69,070 $ 85,095 $ 5,279 $ 21,554 As of December 31, 2016 Accrual Status For the year ($ in thousands) Loan Type Accruing Nonaccrual Impaired Balance Specific Allowance Charged-off Leveraged Finance $ 24,367 $ 90,436 $ 114,803 $ 15,939 $ 26,684 Total $ 24,367 $ 90,436 $ 114,803 $ 15,939 $ 26,684
Age Analysis of Delinquent Receivables	An age analysis of the Company’s delinquent receivables is as follows: 60-89 Days Past Due Greater than 90 Days Total Past Due Current Total Loans Investment > 60 Days & Accruing ($ in thousands) September 30, 2017 Leveraged Finance $ — $ 36,656 $ 36,656 $ 3,012,918 $ 3,049,574 $ 22,596 Real Estate — — — 10,716 10,716 — Total $ — $ 36,656 $ 36,656 $ 3,023,634 $ 3,060,290 $ 22,596 60-89 Days Past Due Greater than 90 Days Total Past Due Current Total Loans Investment in > 60 Days & Accruing ($ in thousands) December 31, 2016 Leveraged Finance $ — $ 21,135 $ 21,135 $ 3,287,791 $ 3,308,926 $ — Real Estate — — — 10,624 10,624 — Total $ — $ 21,135 $ 21,135 $ 3,298,415 $ 3,319,550 $ —
Summary Activity in the Allowance for Credit Losses	A summary of the activity in the allowance for credit losses is as follows: Three Months Ended September 30, 2017 Leveraged Finance Real Estate Total ($ in thousands) Balance, beginning of period $ 47,192 $ 92 $ 47,284 Provision (reversal) for credit losses—general (2,369 ) 1 (2,368 ) Provision for credit losses—specific 3,862 — 3,862 Loans charged off, net of recoveries (8,560 ) — (8,560 ) Balance, end of period $ 40,125 $ 93 $ 40,218 Balance, end of period—specific $ 11,665 $ — $ 11,665 Balance, end of period—general $ 28,460 $ 93 $ 28,553 Average balance of impaired loans $ 131,888 $ — $ 131,888 Interest recognized from impaired loans $ 1,499 $ — $ 1,499 Loans (1) Loans individually evaluated with specific allowance $ 100,085 $ — $ 100,085 Loans individually evaluated with no specific allowance 53,631 — 53,631 Loans collectively evaluated with general allowance 2,488,393 10,716 2,499,109 Total loans $ 2,642,109 $ 10,716 $ 2,652,825 (1) Excludes $407.6 million of Leveraged Finance loans which the Company elected to record at fair value. Nine Months Ended September 30, 2017 Leveraged Finance Real Estate Total ($ in thousands) Balance, beginning of period $ 51,316 $ 92 $ 51,408 Provision for credit losses—general (3,085 ) 1 (3,084 ) Provision for credit losses—specific 13,424 — 13,424 Loans charged off, net of recoveries (21,530 ) — (21,530 ) Balance, end of period $ 40,125 $ 93 $ 40,218 Balance, end of period—specific $ 11,665 $ — $ 11,665 Balance, end of period—general $ 28,460 $ 93 $ 28,553 Average balance of impaired loans $ 149,552 $ — $ 149,552 Interest recognized from impaired loans $ 5,400 $ — $ 5,400 Three Months Ended September 30, 2016 Leveraged Finance Real Estate Equipment Finance Total ($ in thousands) Balance, beginning of period $ 62,645 $ 91 $ 1,307 $ 64,043 Provision for credit losses—general 349 1 (14 ) 336 Provision for credit losses—specific 3,234 — — 3,234 Reclass of Equipment Finance to Assets held-for-sale — — (1,293 ) (1,293 ) Loans charged off, net of recoveries 46 — — 46 Balance, end of period $ 66,274 $ 92 $ — $ 66,366 Balance, end of period—specific $ 36,160 $ — $ — $ 36,160 Balance, end of period—general $ 30,114 $ 92 $ — $ 30,206 Average balance of impaired loans $ 154,695 $ 21,942 $ — $ 176,637 Average net book value of impaired leases $ — $ — $ 623 $ 623 Interest recognized from impaired loans $ 1,627 $ 296 $ — $ 1,923 Loans (1) Loans individually evaluated with specific allowance $ 105,099 $ — $ — $ 105,099 Loans individually evaluated with no specific allowance 44,598 7,160 — 51,758 Loans collectively evaluated with general allowance 2,725,028 10,582 — 2,735,610 Total loans $ 2,874,725 $ 17,742 $ — $ 2,892,467 (1) Excludes $389.3 million of Leveraged Finance loans which the Company elected to record at fair value. Nine Months Ended September 30, 2016 Leveraged Finance Business Credit Real Estate Equipment Finance Total ($ in thousands) Balance, beginning of period $ 54,788 $ 1,991 $ 656 $ 1,291 $ 58,726 Provision for credit losses—general 1,774 (172 ) 1,010 2 2,614 Provision for credit losses—specific 18,115 — 4,177 — 22,292 Reversal due to sale of Business Credit — (1,819 ) — (1,293 ) (3,112 ) Loans charged off, net of recoveries (8,403 ) — (5,751 ) — (14,154 ) Balance, end of period $ 66,274 $ — $ 92 $ — $ 66,366 Balance, end of period—specific $ 36,160 $ — $ — $ — $ 36,160 Balance, end of period—general $ 30,114 $ — $ 92 $ — $ 30,206 Average balance of impaired loans $ 169,690 $ — $ 30,699 $ — $ 200,389 Average net book value of impaired leases $ — $ — $ — $ 698 $ 698 Interest recognized from impaired loans $ 6,606 $ — $ 1,128 $ 12 $ 7,746

Restricted Cash (Tables)

Restricted Cash (Tables)	9 Months Ended
	Sep. 30, 2017
Cash And Cash Equivalents [Abstract]
Summary of Restricted Cash	Restricted cash as of September 30, 2017 and December 31, 2016 was as follows: September 30, 2017 December 31, 2016 ($ in thousands) Collections on loans pledged to credit facilities $ 49,694 $ 43,822 Principal and interest collections on loans held in trust and prefunding amounts 199,156 216,501 Customer escrow accounts 2,803 2,320 Total $ 251,653 $ 262,643

Investments in Debt Securitie31

Investments in Debt Securities, Available-for-Sale (Tables)	9 Months Ended
	Sep. 30, 2017
Investments Debt And Equity Securities [Abstract]
Summary of Amortized Cost of Investments in Debt Securities	Amortized cost of investments in debt securities as of September 30, 2017 and December 31, 2016 was as follows: September 30, 2017 December 31, 2016 ($ in thousands) Investments in debt securities—gross $ 182,422 $ 132,180 Unamortized discount (9,974 ) (6,743 ) Investments in debt securities—amortized cost $ 172,448 $ 125,437
Summary of Amortized Cost, Gross Unrealized Holding Gains, Gross Unrealized Holding Losses, and Fair Value of Available-for-Sale Securities	At September 30, 2017 and December 31, 2016 investments in non-NewStar managed issuers totaled $74.0 million and $75.8 million, respectively. The amortized cost, gross unrealized holding gains, gross unrealized holding losses, and fair value of available-for-sale securities at September 30, 2017 and December 31, 2016 were as follows: Amortized cost Gross unrealized holding gains Gross unrealized holding losses Fair value ($ in thousands) September 30, 2017 Collateralized loan obligations $ 172,448 $ 4,350 $ (961 ) $ 175,837 Investment in debt securities $ 172,448 $ 4,350 $ (961 ) $ 175,837 Amortized cost Gross unrealized holding gains Gross unrealized holding losses Fair value ($ in thousands) December 31, 2016 Collateralized loan obligations $ 125,437 $ 286 $ (6,416 ) $ 119,307 Investment in debt securities $ 125,437 $ 286 $ (6,416 ) $ 119,307
Summary of Unrealized Loss on Investments	The following is an analysis of the continuous periods during which the Company has held investment positions which were carried at an unrealized loss as of September 30, 2017 and December 31, 2016: September 30, 2017 Less than 12 Months Greater than or Equal to 12 Months Total ($ in thousands) Number of positions 6 2 8 Fair value $ 19,895 $ 3,519 $ 23,414 Amortized cost 20,598 3,777 24,375 Unrealized loss $ (703 ) $ (258 ) $ (961 ) December 31, 2016 Less than 12 Months Greater than or Equal to 12 Months Total ($ in thousands) Number of positions 3 17 20 Fair value $ 4,811 $ 68,737 $ 73,548 Amortized cost 4,885 75,079 79,964 Unrealized loss $ (74 ) $ (6,342 ) $ (6,416 )
Summary of Maturities of Debt Securities	Maturities of debt securities classified as available-for-sale were as follows at September 30, 2017 and December 31, 2016: September 30, 2017 December 31, 2016 Amortized cost Fair value Amortized cost Fair value ($ in thousands) Available-for-sale: Due one year or less $ — $ — $ 91 $ 20 Due after one year through five years — — — — Due after five years through ten years 120,183 123,592 53,177 48,404 Due after ten years through fifteen years 52,265 52,245 72,169 70,883 Total $ 172,448 $ 175,837 $ 125,437 $ 119,307

Borrowings (Tables)

Borrowings (Tables)	9 Months Ended
	Sep. 30, 2017
Natixis Term Debt [Member]
Debt Instrument [Line Items]
Summary of Borrowings	The following table sets forth selected information with respect to the Natixis Term Debt: Outstanding balance September 30, 2017 Interest rate ($ in thousands) Natixis Term Debt Class A-1 Notes $ 12,972 Libor + 1.92% Class A-2 Notes 1,597 Libor + 2.81% Class B Notes 1,552 Libor + 3.72% Class C Notes 852 Libor + 4.85% $ 16,973
2012-2 CLO [Member]
Debt Instrument [Line Items]
Summary of Borrowings	The following table sets forth selected information with respect to the 2012-2 CLO: Notes originally issued Outstanding balance September 30, 2017 Interest rate Legal final maturity ($ in thousands) 2012-2 CLO Class A $ 190,700 $ 53,383 Libor+1.90% January Class B 26,000 26,000 Libor+3.25% January 20, 2023 Class C 35,200 35,200 Libor+4.25% January 20, 2023 Class D 11,400 11,400 Libor+6.25% January 20, 2023 Class E 16,300 16,300 Libor+6.75% January 20, 2023 $ 279,600 $ 142,283
2014-1 CLO [Member]
Debt Instrument [Line Items]
Summary of Borrowings	The following table sets forth selected information with respect to the 2014-1 CLO: Notes originally issued Outstanding balance September 30, 2017 Interest rate Legal final maturity ($ in thousands) 2014-1 CLO Class A $ 202,500 $ 202,500 Libor+1.80% April Class B-1 20,000 20,000 Libor+2.60% April 20, 2025 Class B-2 13,250 13,250 (1) April 20, 2025 Class C 30,250 30,250 Libor+3.60% April 20, 2025 Class D 23,500 23,500 Libor+4.75% April 20, 2025 $ 289,500 $ 289,500 (1) Class B-2 Notes accrue interest at a fixed rate of 4.902%.
2015-1 CLO [Member]
Debt Instrument [Line Items]
Summary of Borrowings	The following table sets forth selected information with respect to the 2015-1 CLO: Notes originally issued Outstanding balance September 30, 2017 Interest rate Legal final maturity ($ in thousands) 2015-1 CLO Class A-1 $ 253,500 $ 253,500 Libor+1.80% January 20, 2027 Class A-2 35,000 35,000 (1) January 20, 2027 Class B 50,000 50,000 Libor+2.80% January 20, 2027 Class C 38,500 38,500 Libor+3.85% January 20, 2027 Class D 33,250 33,250 Libor+5.50% January 20, 2027 $ 410,250 $ 410,250 (1) Class A-2 Notes accrue interest at a spread over Libor of 1.65% from the closing date to, but excluding March 20, 2017, and 2.00% thereafter.
2015-2 CLO [Member]
Debt Instrument [Line Items]
Summary of Borrowings	The following table sets forth selected information with respect to the 2015-2 CLO: Notes originally issued Outstanding balance September 30, 2017 Interest rate Legal final maturity ($ in thousands) 2015-2 CLO Class A-1 $ 205,000 $ 205,000 Libor+2.00% August 25, 2027 Class A-2 23,000 23,000 (1) August 25, 2027 Class B 40,000 40,000 Libor+2.90% August 25, 2027 Class C 26,250 26,250 Libor+3.95% August 25, 2027 Class D 28,500 28,500 Libor+5.25% August 25, 2027 Class E 5,000 5,000 Libor+7.50% August 25, 2027 $ 327,750 $ 327,750 (1) Class A-2 Notes accrue interest at a fixed rate of 3.461%.
2016-1 CLO [Member]
Debt Instrument [Line Items]
Summary of Borrowings	The following table sets forth selected information with respect to the 2016-1 CLO: Notes originally issued Outstanding balance September 30, 2017 Interest rate Legal final maturity ($ in thousands) 2016-1 CLO Class A-1 $ 176,500 $ 176,500 Libor+2.30% February 25, 2028 Class A-2 20,000 20,000 (1) February 25, 2028 Class B 36,750 36,750 Libor+3.75% February 25, 2028 Class C 22,500 22,500 Libor+5.40% February 25, 2028 Class D 7,500 7,500 Libor+5.50% February 25, 2028 $ 263,250 $ 263,250 (1) Class A-2 Notes accrue interest at a fixed rate of 3.44%.
Arch Street CLO [Member]
Debt Instrument [Line Items]
Summary of Borrowings	The following table sets forth selected information with respect to the Arch Street CLO: Notes originally issued Outstanding balance September 30, 2017 Interest rate Legal final maturity ($ in thousands) Arch Street CLO Class X $ 2,500 $ - Libor+1.25% October 20, 2028 Class A 256,000 256,000 Libor+1.65% October 20, 2028 Class B 48,000 48,000 Libor+2.24% October 20, 2028 Class C 20,000 20,000 Libor+3.00% October 20, 2028 Class D 22,750 22,750 Libor+4.20% October 20, 2028 Class E 21,000 21,000 Libor+6.95% October 20, 2028 $ 370,250 $ 367,750
2017-1 CLO [Member]
Debt Instrument [Line Items]
Summary of Borrowings	The following table sets forth selected information with respect to the 2017-1 CLO: Notes originally issued Outstanding balance September 30, 2017 Interest rate Legal final maturity ($ in thousands) 2017-1 CLO Class A-T-N $ 207,000 $ 207,000 Libor+1.78% September Class A-R-N 25,000 - Libor+1.78% September Class B-N 40,000 40,000 Libor+2.50% September Class C-N 32,000 32,000 Libor+3.50% September Class D-N 24,000 24,000 Libor+5.10% September $ 328,000 $ 303,000

Stockholders' Equity (Tables)

Stockholders' Equity (Tables)	9 Months Ended
	Sep. 30, 2017
Equity [Abstract]
Schedule of Authorized Capital	As of September 30, 2017 and December 31, 2016, the Company’s authorized capital consists of preferred and common stock and the following was authorized and outstanding: September 30, 2017 December 31, 2016 Shares authorized Shares outstanding Shares authorized Shares outstanding (In thousands) Preferred stock 5,000 — 5,000 — Common stock 145,000 41,481 145,000 42,820
Schedule of Restricted Stock Activity	Restricted stock activity for the nine months ended September 30, 2017 was as follows: Shares Grant-date fair value ($ in thousands) Non-vested as of December 31, 2016 840,834 $ 6,564 Granted 340,939 3,350 Vested (384,473 ) (3,209 ) Forfeited (7,333 ) (65 ) Non-vested as of September 30, 2017 789,967 $ 6,640
Schedule of Stock Option Activity	Stock option activity for the nine months ended September 30, 2017 was as follows: Options Outstanding as of December 31, 2016 421,692 Granted — Exercised (286,692 ) Forfeited (10,000 ) Outstanding as of September 30, 2017 125,000 Vested and exercisable as of September 30, 2017 125,000

Earnings Per Share (Tables)

Earnings Per Share (Tables)	9 Months Ended
	Sep. 30, 2017
Earnings Per Share [Abstract]
Computations of Basic and Diluted Income Per Share	The Company utilizes the two-class method to calculate earnings per share. The two-class method allocates net income to each class of common stock and participating security. Unvested share-based payment awards granted to certain employees and board members entitle holders to same rights as outstanding and vested common stock. These securities are considered to be participating securities and are included in the allocation for computing earnings per share under this method. Income is allocated to common shareholders and participating securities under the two-class method based upon the proportion of each to the total weighted average shares available. The computations of basic and diluted income per share for the three and nine months ended September 30, 2017 and 2016 are as follows: Three Months Ended September 30, Nine Months Ended September 30, 2017 2016 2017 2016 (In thousands) Numerator: Net income to common shareholders $ 4,585 $ 8,644 $ 10,119 $ 17,894 Net income allocated to participating securities - basic and diluted 87 157 191 302 Net income allocated to common shareholders - basic and diluted 4,498 8,487 9,928 17,592 Denominator: Denominator for basic earnings per common share 40,786 45,812 41,269 46,216 Denominator for diluted earnings per common share: Denominator for basic earnings per common share 40,786 45,812 41,269 46,216 Potentially dilutive securities - options 21 — 20 — Total weighted average diluted shares 40,807 45,812 41,289 46,216 Earnings per common share Basic $ 0.11 $ 0.19 $ 0.24 $ 0.38 Diluted $ 0.11 $ 0.19 $ 0.24 $ 0.38

Variable Interest Entities (Tab

Variable Interest Entities (Tables)	9 Months Ended
	Sep. 30, 2017
Organization Consolidation And Presentation Of Financial Statements [Abstract]
Schedule of Unconsolidated Variable Interest Entities	The following table sets forth the information with respect to the unconsolidated VIEs for which the Company holds a variable interest in as of September 30, 2017 and December 31, 2016: September 30, 2017 December 31, 2016 ($ in thousands) Unconsolidated VIE assets $ 2,104,050 $ 912,900 Unconsolidated VIE liabilities 1,903,200 810,030 Equity interest included on the Consolidated Balance Sheet 103,602 50,386 Maximum risk of loss (1) 105,570 50,794 (1) Includes equity investment the Company has made, or is required to make, and any earned but uncollected management and incentive fees. The Company does not record performance and incentive allocations until the respective measurement period has ended.

Financial Instruments with Of36

Financial Instruments with Off-Balance Sheet Risk (Tables)	9 Months Ended
	Sep. 30, 2017
Commitments And Contingencies Disclosure [Abstract]
Financial Instruments with Off-Balance Sheet Risk	Financial instruments with off-balance sheet risk are summarized as follows: September 30, 2017 December 31, 2016 ($ in thousands) Unused lines of credit $ 303,861 $ 326,051 Standby letters of credit 6,776 8,239

Total Return Swap (Tables)

Total Return Swap (Tables)	9 Months Ended
	Sep. 30, 2017
Derivative Instruments And Hedging Activities Disclosure [Abstract]
Schedule of Receivable and Realized Loss on Total Return Swap	At March 31, 2016, the receivable and realized loss on the total return swap on the consolidated balance sheet and consolidated statements of operations consisted of the following: Net Receivable Net Realized Gains/(Losses) ($ in thousands) Interest income from TRS portfolio $ — $ 2,355 TRS interest expense — 848 Realized loss on TRS — (6,122 ) Due to Citibank (10,984 ) — TRS receivable 1,145 —

Fair Value (Tables)

Fair Value (Tables)	9 Months Ended
	Sep. 30, 2017
Fair Value Disclosures [Abstract]
Assets and Liabilities Measured at Fair Value on Recurring and Nonrecurring Basis	The following table presents recorded amounts of assets and liabilities measured at fair value on a recurring and nonrecurring basis as of September 30, 2017, by caption in the consolidated balance sheet and by ASC 820 valuation hierarchy. Quoted Prices in Active Markets for Identical Assets (Level 1) Significant Other Observable Inputs (Level 2) Significant Unobservable Inputs (Level 3) Total Carrying Value in Consolidated Balance Sheet ($ in thousands) Recurring Basis: Assets: Investments in debt securities, available-for-sale $ — $ — $ 175,837 $ 175,837 Loans — 407,465 — 407,465 Total assets recorded at fair value on a recurring basis $ — $ 407,465 $ 175,837 $ 583,302 Nonrecurring Basis: Assets: Loans held-for-sale $ — $ 25,219 $ 10,538 $ 35,757 Other real estate owned/repossessed assets — — 15,600 15,600 Total assets recorded at fair value on a nonrecurring basis $ — $ 25,219 $ 26,138 $ 51,357 The following table presents recorded amounts of assets and liabilities measured at fair value on a recurring and nonrecurring basis as of December 31, 2016, by caption in the consolidated balance sheet and by ASC 820 valuation hierarchy. Quoted Prices in Active Markets for Identical (Level 1) Significant Other Observable Inputs (Level 2) Significant Unobservable Inputs (Level 3) Total Carrying Value in Consolidated Balance Sheet ($ in thousands) Recurring Basis: Assets: Investments in debt securities, available-for-sale $ — $ — $ 119,307 $ 119,307 Loans — 403,745 — 403,745 Total assets recorded at fair value on a recurring basis $ — $ 403,745 $ 119,307 $ 523,052 Liabilities: Contingent liability — — 1,350 $ 1,350 Total liabilities recorded at fair value on a recurring basis $ — $ — $ 1,350 $ 1,350 Nonrecurring Basis: Assets: Loans held-for-sale $ — $ 4,465 $ 2,459 $ 6,924 Other real estate owned/repossessed assets — — 15,750 15,750 Total assets recorded at fair value on a nonrecurring basis $ — $ 4,465 $ 18,209 $ 22,674
Summary of Significant Unobservable Inputs and Valuation Techniques	The following table presents a summary of significant unobservable inputs and valuation techniques of the Company’s Level 3 fair value measurements at September 30, 2017. Fair Valuation Techniques Unobservable Input Range ($ in thousands) Financial assets: Investments in debt securities, available-for-sale $ 175,837 Third-party Pricing Loans held-for-sale 10,538 Market comparables Cost to Sell 3%-7% Valuation model Marketability discount 5%-30% Other real estate/repossessed assets 15,600 Appraisal Cost to sell 3%- 7% Total Assets: $ 201,975 The following table presents a summary of significant unobservable inputs and valuation techniques of the Company’s Level 3 fair value measurements at December 31, 2016. Fair value Valuation Techniques Unobservable Input Range ($ in thousands) Financial assets: Investments in debt securities, available-for-sale $ 119,307 Third-party pricing Pricing Loans held-for-sale 2,459 Market comparables Cost to sell 3% - Valuation model Marketability discount 5%-30% Other real estate owned/repossessed assets 15,750 Appraisal Cost to sell 3% - 7% Total Assets: $ 137,516 Financial liabilities: Contingent liability 1,350 Valuation model PoD/LGD Total Liability: $ 1,350
Reconciliation of Financial Instruments Measured on Recurring Basis and Classified as Level 3 Inputs	For the three months ended September 30, 2017: Investments Debt Securities, Available-for-sale ($ Balance as of June 30, 2017 $ 151,426 Total gains or losses (realized/unrealized) Included in earnings 161 Included in other comprehensive income (loss) 1,488 Purchases 23,069 Issuances — Settlements (307 ) Balance as of September 30, 2017 $ 175,837 For the three months ended September 30, 2016: Investments Debt Securities, Available-for-sale ($ Balance as of June 30, 2016 $ 91,400 Total gains or losses (realized/unrealized) Included in earnings 342 Included in other comprehensive income (loss) 5,072 Purchases — Issuances — Settlements (6,000 ) Balance as of September 30, 2016 $ 90,814 For the nine months ended September 30, 2017: Investments Debt Securities, Available-for-sale ($ Balance as of December 31, 2016 $ 119,307 Total gains or losses (realized/unrealized) Included in earnings 539 Included in other comprehensive income (loss) 9,535 Purchases 52,682 Issuances — Settlements (6,226 ) Balance as of September 30, 2017 $ 175,837 For the nine months ended September 30, 2016: Investments Debt Securities, Available-for-sale ($ Balance as of December 31, 2015 $ 94,177 Total gains or losses (realized/unrealized) Included in earnings 655 Included in other comprehensive income (loss) 1,982 Purchases — Issuances — Settlements (6,000 ) Balance as of September 30, 2016 $ 90,814
Carrying Amounts, Estimated Fair Values and Placement in Fair Value Hierarchy of Financial Instruments	The following table presents the carrying amounts, estimated fair values and placement in the fair value hierarchy of the Company’s financial instruments at September 30, 2017 and December 31, 2016. The fair value of a financial instrument is the amount at which the instrument could be exchanged in a current transaction between willing parties. The carrying amounts shown in the table are included in the consolidated balance sheets under the indicated captions. Estimated Fair Value of Financial Instruments September 30, 2017 Fair Value Measurements Carrying amount Fair Level 1 Level 2 Level 3 ($ in thousands) Financial assets: Investments in debt securities available-for-sale 175,837 175,837 175,837 Loans held-for-sale, net 371,941 376,833 196,977 179,856 Loans, net 2,995,997 2,995,619 407,465 2,588,154 Other assets 20,383 20,383 20,383 Financial liabilities: Credit facilities, net $ 456,961 $ 456,961 $ 456,961 Term debt, net 16,973 16,973 16,973 Term debt securitizations, net 2,085,733 2,162,702 2,162,702 Senior notes, net 375,287 390,450 390,450 Subordinated notes, net 246,929 325,001 325,001 Repurchase agreements, net 80,569 80,569 80,569 Other liabilities 1,000 1,000 1,000 Estimated Fair Value of Financial Instruments December 31, 2016 Fair Value Measurements Carrying amount Fair Level 1 Level 2 Level 3 ($ in thousands) Financial assets: Investments in debt securities available-for-sale 119,307 119,307 119,307 Loans held-for-sale, net 144,060 145,406 69,875 75,531 Loans, net 3,239,191 3,241,910 403,745 2,838,165 Other assets 15,954 15,954 15,954 Financial liabilities: Credit facilities, net $ 445,493 $ 445,493 $ 445,493 Term debt securitizations, net 2,195,064 2,230,102 2,230,102 Senior notes, net 373,919 380,000 380,000 Subordinated notes, net 241,390 303,916 303,916 Repurchase agreements, net 55,046 55,046 55,046 Other liabilities 1,350 1,350 1,350

Segment Reporting (Tables)

Segment Reporting (Tables)	9 Months Ended
	Sep. 30, 2017
Segment Reporting [Abstract]
Summary of Assets and Statement of Operations	The following tables presents the statement of operations and total assets for the Company’s reportable segments: Three Months Ended September 30, 2017 Commercial Lending Asset Management Consolidated Total Net interest income: $ 14,495 $ 1,112 $ 15,607 Provision for loan losses 1,494 — 1,494 Net interest income after provision 13,001 1,112 14,113 Noninterest income: Management fees — 3,474 3,474 Performance fees — 70 70 Other lending fees 988 37 1,025 Gain on sale of loans and equipment 27 247 274 Other noninterest income (1) 1,837 (1,157 ) 680 Total noninterest income: 2,852 2,671 5,523 Non-interest expense 9,371 2,529 11,900 Income before income taxes $ 6,482 $ 1,254 $ 7,736 Income tax expense 3,151 Net income $ 4,585 (1) Includes fair value adjustments on Loans held-for-sale and fair value portfolio. Nine Months Ended September 30, 2017 Commercial Lending Asset Management Consolidated Total Net interest income: $ 41,136 $ 3,467 $ 44,603 Provision for loan losses 10,341 — 10,341 Net interest income after provision 30,795 3,467 34,262 Noninterest income: Management fees — 9,602 9,602 Performance fees — 1,415 1,415 Other lending fees 6,257 122 6,379 Gain on sale of loans and equipment 246 1,235 1,481 Other noninterest income (1) 5,146 (7,170 ) (2,024 ) Total noninterest income: 11,649 5,204 16,853 Non-interest expense 27,229 6,607 33,836 Income before income taxes $ 15,215 $ 2,064 $ 17,279 Income tax expense 7,160 Net income $ 10,119 (1) Includes fair value adjustments on Loans held-for-sale and fair value portfolio. Three months ended September 30, 2016 Commercial Lending Asset Management Consolidated Total ($ in thousands) Net interest income $ 24,135 $ 1,123 $ 25,258 Provision for loan losses 3,570 — 3,570 Net interest income after provision 20,565 1,123 21,688 Noninterest income: Management fees — 2,888 2,888 Performance fees — 465 465 Other lending fees 2,871 75 2,946 Gain on sale of loans and equipment 83 69 152 Other noninterest income (1) 1,059 3,456 4,515 Total Noninterest income: 4,013 6,953 10,966 Non-interest expense 14,833 3,236 18,069 Income before income taxes $ 9,745 $ 4,840 $ 14,585 Income tax expense 5,941 Net income $ 8,644 (1) Includes fair value adjustment on Loans held-for-sale. Nine months ended September 30, 2016 Commercial Lending Asset Management Consolidated Total ($ in thousands) Net interest income $ 65,752 $ 2,931 $ 68,683 Provision for loan losses 24,906 — 24,906 Net interest income after provision 40,846 2,931 43,777 Noninterest income: Management fees — 9,031 9,031 Performance fees — 1,306 1,306 Other lending fees 5,729 107 5,836 Gain on sale of loans and equipment 545 220 765 Other noninterest income (1) 13,819 3,720 17,539 Total Noninterest income: 20,093 14,384 34,477 Non-interest expense 40,027 7,950 47,977 Income before income taxes $ 20,912 $ 9,365 $ 30,277 Income tax expense 12,383 Net income $ 17,894 (1) Includes fair value adjustments on Loans held-for-sale and fair value portfolio. September 30, 2017 Commercial Lending Asset Management Total ($ in thousands) Loans and leases, gross (including loans at fair value of $407,465) $ 2,652,825 $ 407,465 $ 3,060,290 Loans held-for-sale, gross 375,560 — 375,560 Investments in debt securities, available-for-sale — 175,837 175,837 Other 314,780 76,167 390,947 Total Balance Sheet Assets 3,343,165 659,469 4,002,634 Illiquid Credit funds * — 2,018,397 2,018,397 Liquid/Tradeable Credit * — 1,541,582 1,541,582 Total Assets 3,343,165 4,219,448 7,562,613 Less: Non Managed assets (1) 314,780 66,193 380,973 Total Managed Assets $ 3,028,385 $ 4,153,255 $ 7,181,640 * Assets managed by the Company for the Illiquid Credit and Liquid/Tradeable Credit Funds are not assets of the Company and are not included in the Consolidated Total Assets as reflected in the Condensed Consolidated Balance Sheet. (1) Other less unamortized discount on investment in debt securities, available-for-sale. December 31, 2016 Commercial Lending Asset Management Total ($ in thousands) Loans and leases, gross (including loans at fair value of $403,745) $ 2,915,805 $ 403,745 $ 3,319,550 Loans held-for-sale, gross 145,966 — 145,966 Investments in debt securities, available-for-sale — 119,307 119,307 Other 374,851 80,918 455,769 Total Balance Sheet Assets 3,436,622 603,970 4,040,592 Illiquid Credit funds * — 1,314,690 1,314,690 Liquid/Tradeable Credit * — 1,833,607 1,833,607 Total Assets 3,436,622 3,752,267 7,188,889 Less: Non Managed assets (1) 374,851 74,175 449,026 Total Managed Assets $ 3,061,771 $ 3,678,092 $ 6,739,863 * Assets managed by the Company for the Illiquid Credit and Liquid/Tradeable Credit Funds are not assets of the Company and are not included in the Consolidated Total Assets as reflected in the Condensed Consolidated Balance Sheet. (1) Other less unamortized discount on investment in debt securities, available-for-sale.

Organization - Additional Infor

Organization - Additional Information (Detail) $ in Billions	9 Months Ended
	Sep. 30, 2017USD ($)Segment
Schedule Of Investment Income Reported Amounts By Category [Line Items]
Assets managed	$ 7.2
Number of operating segment | Segment	2
NewStar Capital [Member]
Schedule Of Investment Income Reported Amounts By Category [Line Items]
Assets managed	$ 3.6
Off Balance Sheet Credit Funds [Member]
Schedule Of Investment Income Reported Amounts By Category [Line Items]
Assets managed	$ 3.6

Acquisition and Disposition A41

Acquisition and Disposition Activities - Additional Information (Detail) - USD ($)	Jul. 20, 2017	Dec. 01, 2016	Mar. 31, 2016	Sep. 30, 2017	Sep. 30, 2016
Business Acquisition [Line Items]
Business acquisition date				Jul. 20, 2017
Gain on sale of Business Credit, net					$ 22,511,000
Fifth Street CLO Management LLC [Member]
Business Acquisition [Line Items]
Business acquisition date				Jul. 20, 2017
Percentage of outstanding limited liability interests acquired	100.00%
Purchase price	$ 16,600,000
Assumed indebtedness	13,098,000
Estimated value of identified intangible assets	5,394,000
Fifth Street CLO Management LLC [Member] | Customer Contracts and Related Customer Relationships [Member]
Business Acquisition [Line Items]
Estimated value of identified intangible assets	$ 5,400,000
Identified Intangible assets, Average useful life	3 years 6 months
NewStar Equipment Finance Assets and Related Platform [Member]
Business Acquisition [Line Items]
Gain on sale of Business Credit, net		$ 6,700,000
Transaction related cost		4,300,000
Contingent consideration liability		$ 1,400,000		$ 1,000,000
Initial indemnification of actual credit losses				10,000,000
Initial indemnification of actual credit losses at December 31, 2017				8,000,000
Initial indemnification of actual credit losses at December 31, 2018				5,000,000
Initial indemnification of actual credit losses at December 31, 2019				3,000,000
Initial indemnification of actual credit losses at December 31, 2020				$ 0
New Star Business Credit, LLC [Member]
Business Acquisition [Line Items]
Gain on sale of Business Credit, net			$ 22,500,000
Transaction related cost			$ 2,500,000

Acquisition and Disposition A42

Acquisition and Disposition Activities - Schedule of Allocation of Purchase Price to Estimated Fair Value of Assets Acquired and Liabilities Assumed (Detail) - Fifth Street CLO Management LLC [Member] $ in Thousands	Jul. 20, 2017USD ($)
Assets Acquired
Investment in available for sale securities	$ 23,068
Identified intangible assets	5,394
Other assets	1,221
Total assets acquired	29,683
Liabilities Assumed
Accrued expenses	125
Term Debt	12,973
Total Liabilities Assumed	13,098
Identified, net assets acquired	$ 16,585

Loans Held-for-Sale, Loans, L43

Loans Held-for-Sale, Loans, Leases and Allowance for Credit Losses - Loans Held-for-Sale (Detail) - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross loans held-for-sale	$ 3,060,290	$ 3,319,550
Deferred loan fees, net	(24,534)	(29,423)
Loans held-for-sale, net	2,995,997	3,239,191
Leveraged Finance [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross loans held-for-sale	3,049,574	3,308,926
Finance Receivables Loans Held For Sale [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross loans held-for-sale	375,560	145,966
Deferred loan fees, net	(3,619)	(1,906)
Loans held-for-sale, net	371,941	144,060
Finance Receivables Loans Held For Sale [Member] | Leveraged Finance [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross loans held-for-sale	376,276	146,126
Finance Receivables Loans Held For Sale [Member] | Lower Cost or Market Adjustment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross loans held-for-sale	$ (716)	$ (160)

Loans Held-for-Sale, Loans, L44

Loans Held-for-Sale, Loans, Leases and Allowance for Credit Losses - Additional Information (Detail) $ in Thousands	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2017USD ($)risk_factor	Sep. 30, 2016USD ($)	Sep. 30, 2017USD ($)risk_factor	Sep. 30, 2016USD ($)	Dec. 31, 2016USD ($)	Jun. 30, 2017USD ($)	Jun. 30, 2016USD ($)	Dec. 31, 2015USD ($)
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held-for-sale an aggregate outstanding balance	$ 375,560		$ 375,560		$ 145,966
Gain (loss) on sale of loans, net	294	$ (19)	1,501	$ 36
Loans and leases, net	2,995,997		2,995,997		3,239,191
Impaired loans	153,716		153,716		133,413
Impaired loans restructured and classified as TDRs					114,800
Aggregate carrying value of equity investments	10,900		10,900		9,900
Recorded Investment in Nonaccrual Loans	103,819		103,819		99,233
Carrying value of non-accrual loans	97,400		97,400		92,900
Impaired loans, non-accrual status	26,900		35,500		27,100
Specific provisions for impaired loans during the year	3,900		13,400		24,800
Specific allowance for impaired loans	11,700		11,700
Impaired loans with specific allowance	100,100		100,100		73,500
Impaired loans related to delinquent loans	36,656		$ 36,656		$ 21,135
Number of days past due to classified as delinquent			60 days		60 days
Loans charged-off, net of recoveries	$ 8,560	(46)	$ 21,530	14,154
Non-accrual loan returned to performing status					$ 0
Specific allowance for impaired loans					19,800
Previously charged-off impaired loan outstanding balances, recovered		50
Number of risk factors used to determine allowance for credit losses. | risk_factor	7		7
Allowance for unfunded commitments	$ 39,759		$ 39,759		50,936
Allowance for credit losses	40,218	66,366	40,218	66,366	$ 51,408	$ 47,284	$ 64,043	$ 58,726
Provision for credit losses	$ 1,494	$ 3,570	$ 10,341	24,906
Financing receivable percentage of impaired and troubled debt restructuring to all loans	5.00%		5.00%		4.00%
Commitments To Extend Credit [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for unfunded commitments	$ 500		$ 500		$ 500
TDRs [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Impaired loans restructured and classified as TDRs	85,095		85,095		114,803
Range of commitment per borrower			4,100
Specific allowance for impaired loans	5,279		5,279		15,939
Impaired loans related to delinquent loans on non-accural status	69,070		69,070		90,436
Non-accrual Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, charged off	21,500		8,600
Loans charged-off, net of recoveries					25,700
Non-accrual Loans [Member] | TDRs [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans charged-off, net of recoveries	8,600		21,600
Nonperforming Financing Receivable
Accounts, Notes, Loans and Financing Receivable [Line Items]
Range of commitment per borrower			14,100		11,900
Specific allowance for impaired loans	5,100		5,100		7,900
Nonperforming Financing Receivable | Financing Receivables Greater Than 60 Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Impaired loans related to delinquent loans	36,700		36,700
Impaired loans related to delinquent loans on non-accural status	4,000		4,000		21,100
Criticized [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases, net	106,800		106,800		118,700
Impaired loans	106,800		106,800		118,700
Loans Pass [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases, net	3,000,000		3,000,000		$ 3,200,000
Other than NCOF [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans sold, outstanding balance amount	48,300		48,300				$ 105,000
Gain (loss) on sale of loans, net			100	$ (40)
Credit Funds [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held-for-sale an aggregate outstanding balance	$ 376,300		$ 376,300

Loans Held-for-Sale, Loans, L45

Loans Held-for-Sale, Loans, Leases and Allowance for Credit Losses - Summary of Loans (Detail) - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016
Financing Receivable, Impaired [Line Items]
Gross loans	$ 3,060,290	$ 3,319,550
Deferred loan fees, net	(24,534)	(29,423)
Allowance for loan losses	(39,759)	(50,936)
Loans held-for-sale, net	2,995,997	3,239,191
Leveraged Finance [Member]
Financing Receivable, Impaired [Line Items]
Gross loans	3,049,574	3,308,926
Allowance for loan losses	(39,666)	(50,844)
Real Estate [Member]
Financing Receivable, Impaired [Line Items]
Gross loans	10,716	10,624
Allowance for loan losses	$ (93)	$ (92)

Loans Held-for-Sale, Loans, L46

Loans Held-for-Sale, Loans, Leases and Allowance for Credit Losses - Summary of Loans (Parenthetical) (Detail) - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016
Commercial Lending and Asset Management [Member]
Financing Receivable, Impaired [Line Items]
Loans at fair value	$ 407,465	$ 403,745

Loans Held-for-Sale, Loans, L47

Loans Held-for-Sale, Loans, Leases and Allowance for Credit Losses - Summary of Impaired Loans (Detail) - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016
Loans Held For Sale Loans And Allowance For Credit Losses [Abstract]
Investment, Net of Charge-offs	$ 153,716	$ 133,413
Investment, Net of Unamortized Discount/Premium	146,742	126,839
Unpaid Principal	179,471	154,879
Recorded Investment with a Related Allowance for Credit Losses	100,085	73,499
Recorded Investment, net, with a Related Allowance for Credit Losses	93,176	68,924
Recorded Investment without a Related Allowance for Credit Losses	53,631	59,914
Recorded Investment, net, without a Related Allowance for Credit Losses	$ 53,566	$ 57,915

Loans Held-for-Sale, Loans, L48

Loans Held-for-Sale, Loans, Leases and Allowance for Credit Losses - Evaluation Summary of Amortized Cost Portfolio and Allowance for Loan Losses by Impairment (Detail) - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016	Sep. 30, 2016
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance, Total	$ 39,759	$ 50,936
Investment, Collectively evaluated	2,499,109		$ 2,735,610
Total investment evaluated	2,652,825		2,892,467
Leveraged Finance [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance, Collectively evaluated	28,001	31,073
Allowance, Individually evaluated	11,665	19,771
Allowance, Total	39,666	50,844
Investment, Collectively evaluated	2,488,393	2,771,768	2,725,028
Investment, Individually evaluated	153,716	133,413
Total investment evaluated	2,642,109	2,905,181	2,874,725
Real Estate [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance, Collectively evaluated	93	92
Allowance, Total	93	92
Investment, Collectively evaluated	10,716	10,624	10,582
Total investment evaluated	$ 10,716	$ 10,624	$ 17,742

Loans Held-for-Sale, Loans, L49

Loans Held-for-Sale, Loans, Leases and Allowance for Credit Losses - Evaluation Summary of Amortized Cost Portfolio and Allowance for Loan Losses by Impairment (Parenthetical) (Detail) $ in Millions	9 Months Ended	12 Months Ended
	Sep. 30, 2017USD ($)	Dec. 31, 2016USD ($)
Leveraged Finance [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Weighted Average Risk Rating of Loans and Leases	5.3	5.2
Point Scale Used to Determine Weighted Average Risk Rating of Loans and Leases	12	12
Fair value of loans acquired	$ 407.5	$ 403.7
Real Estate [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Weighted Average Risk Rating of Loans and Leases	5.3	5.2
Point Scale Used to Determine Weighted Average Risk Rating of Loans and Leases	12	12

Loans Held-for-Sale, Loans, L50

Loans Held-for-Sale, Loans, Leases and Allowance for Credit Losses - Summary of Company's Investment in Nonaccrual Loans (Detail) - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016
Loans Held For Sale Loans And Allowance For Credit Losses [Abstract]
Nonaccrual loans	$ 103,819	$ 99,233
Less: Deferred loan fees	(6,533)	(6,485)
Add back: Interest receivable	73	116
Total	$ 97,359	$ 92,864

Loans Held-for-Sale, Loans, L51

Loans Held-for-Sale, Loans, Leases and Allowance for Credit Losses - Summary of Types of Concessions with Respect to TDRs (Detail) - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016
Troubled Debt Restructuring, Debtor, Subsequent Periods [Line Items]
Impaired loans restructured and classified as TDRs		$ 114,800
Group I [Member]
Troubled Debt Restructuring, Debtor, Subsequent Periods [Line Items]
Impaired loans restructured and classified as TDRs	$ 85,095	114,803
Group II [Member]
Troubled Debt Restructuring, Debtor, Subsequent Periods [Line Items]
Impaired loans restructured and classified as TDRs	$ 54,392	$ 77,061

Loans Held-for-Sale, Loans, L52

Loans Held-for-Sale, Loans, Leases and Allowance for Credit Losses - Summary of the Company's Loans Classified as TDR (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Financing Receivable, Modifications [Line Items]
Pre-Modification Outstanding Recorded Investment	$ 5,815	$ 8,372	$ 5,815	$ 10,147
Post-Modification Outstanding Recorded Investment	5,277	8,473	5,277	9,781
Investment in TDR Subsequently Defaulted	5,277		34,735	4,483
Leveraged Finance [Member]
Financing Receivable, Modifications [Line Items]
Pre-Modification Outstanding Recorded Investment	5,815	8,372	5,815	10,147
Post-Modification Outstanding Recorded Investment	5,277	$ 8,473	5,277	9,781
Investment in TDR Subsequently Defaulted	$ 5,277		$ 34,735
Real Estate [Member]
Financing Receivable, Modifications [Line Items]
Investment in TDR Subsequently Defaulted				$ 4,483

Loans Held-for-Sale, Loans, L53

Loans Held-for-Sale, Loans, Leases and Allowance for Credit Losses - Breakdown of Troubled Debt Restructurings (Detail) - USD ($) $ in Thousands	9 Months Ended	12 Months Ended
	Sep. 30, 2017	Dec. 31, 2016
Troubled Debt Restructuring, Debtor, Subsequent Periods [Line Items]
TDR/Impaired Balance		$ 114,800
Specific Allowance	$ 11,700
TDRs [Member]
Troubled Debt Restructuring, Debtor, Subsequent Periods [Line Items]
Accruing	16,025	24,367
Nonaccrual	69,070	90,436
TDR/Impaired Balance	85,095	114,803
Specific Allowance	5,279	15,939
Charged- off	21,554	26,684
TDRs [Member] | Leveraged Finance [Member]
Troubled Debt Restructuring, Debtor, Subsequent Periods [Line Items]
Accruing	16,025	24,367
Nonaccrual	69,070	90,436
TDR/Impaired Balance	85,095	114,803
Specific Allowance	5,279	15,939
Charged- off	$ 21,554	$ 26,684

Loans Held-for-Sale, Loans, L54

Loans Held-for-Sale, Loans, Leases and Allowance for Credit Losses - Age Analysis of Delinquent Receivables (Detail) - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016
Financing Receivable Recorded Investment Past Due [Line Items]
Total Past Due	$ 36,656	$ 21,135
Current	3,023,634	3,298,415
Total Loans	3,060,290	3,319,550
Investment in > 60 Days & Accruing	22,596
Leveraged Finance [Member]
Financing Receivable Recorded Investment Past Due [Line Items]
Total Past Due	36,656	21,135
Current	3,012,918	3,287,791
Total Loans	3,049,574	3,308,926
Investment in > 60 Days & Accruing	22,596
Real Estate [Member]
Financing Receivable Recorded Investment Past Due [Line Items]
Current	10,716	10,624
Total Loans	10,716	10,624
Financing Receivables, Equal to Greater than 90 Days Past Due [Member]
Financing Receivable Recorded Investment Past Due [Line Items]
Total Past Due	36,656	21,135
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Leveraged Finance [Member]
Financing Receivable Recorded Investment Past Due [Line Items]
Total Past Due	$ 36,656	$ 21,135

Loans Held-for-Sale, Loans, L55

Loans Held-for-Sale, Loans, Leases and Allowance for Credit Losses - Summary Activity in the Allowance for Credit Losses (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016	Dec. 31, 2016
Financing Receivable, Allowance for Credit Losses [Line Items]
Balance, beginning of period	$ 47,284	$ 64,043	$ 51,408	$ 58,726	$ 58,726
Provision (reversal) for credit losses—general	(2,368)	336	(3,084)	2,614
Provision for credit losses—specific	3,862	3,234	13,424	22,292
Reclass of Equipment Finance to Assets held-for-sale		(1,293)
Reversal due to sale of Business Credit				(3,112)
Loans charged off, net of recoveries	(8,560)	46	(21,530)	(14,154)
Balance, end of period	40,218	66,366	40,218	66,366	51,408
Balance, end of period—specific	11,665	36,160	11,665	36,160
Balance, end of period—general	28,553	30,206	28,553	30,206
Average balance of impaired loans and leases	131,888	176,637	149,552	200,389
Interest recognized from impaired loans	1,499	1,923	5,400	7,746
Loans individually evaluated with specific allowance	100,085	105,099	100,085	105,099
Loans individually evaluated with no specific allowance	53,631	51,758	53,631	51,758
Loans collectively evaluated with general allowance	2,499,109	2,735,610	2,499,109	2,735,610
Total investment evaluated	2,652,825	2,892,467	2,652,825	2,892,467
Leases [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Average balance of impaired loans and leases		623		698
Leveraged Finance [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Balance, beginning of period	47,192	62,645	51,316	54,788	54,788
Provision (reversal) for credit losses—general	(2,369)	349	(3,085)	1,774
Provision for credit losses—specific	3,862	3,234	13,424	18,115
Reclass of Equipment Finance to Assets held-for-sale		0
Reversal due to sale of Business Credit				0
Loans charged off, net of recoveries	(8,560)	46	(21,530)	(8,403)
Balance, end of period	40,125	66,274	40,125	66,274	51,316
Balance, end of period—specific	11,665	36,160	11,665	36,160
Balance, end of period—general	28,460	30,114	28,460	30,114
Average balance of impaired loans and leases	131,888	154,695	149,552	169,690
Interest recognized from impaired loans	1,499	1,627	5,400	6,606
Loans individually evaluated with specific allowance	100,085	105,099	100,085	105,099
Loans individually evaluated with no specific allowance	53,631	44,598	53,631	44,598
Loans collectively evaluated with general allowance	2,488,393	2,725,028	2,488,393	2,725,028	2,771,768
Total investment evaluated	2,642,109	2,874,725	2,642,109	2,874,725	2,905,181
Leveraged Finance [Member] | Leases [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Average balance of impaired loans and leases		0		0
Real Estate [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Balance, beginning of period	92	91	92	656	656
Provision (reversal) for credit losses—general	1	1	1	1,010
Provision for credit losses—specific	0	0	0	4,177
Reclass of Equipment Finance to Assets held-for-sale		0
Reversal due to sale of Business Credit				0
Loans charged off, net of recoveries	0	0	0	(5,751)
Balance, end of period	93	92	93	92	92
Balance, end of period—specific	0	0	0	0
Balance, end of period—general	93	92	93	92
Average balance of impaired loans and leases	0	21,942	0	30,699
Interest recognized from impaired loans	0	296	0	1,128
Loans individually evaluated with specific allowance	0	0	0	0
Loans individually evaluated with no specific allowance	0	7,160	0	7,160
Loans collectively evaluated with general allowance	10,716	10,582	10,716	10,582	10,624
Total investment evaluated	$ 10,716	17,742	$ 10,716	17,742	10,624
Real Estate [Member] | Leases [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Average balance of impaired loans and leases		0		0
Equipment Finance [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Balance, beginning of period		1,307		1,291	1,291
Provision (reversal) for credit losses—general		(14)		2
Provision for credit losses—specific		0		0
Reclass of Equipment Finance to Assets held-for-sale		(1,293)
Reversal due to sale of Business Credit				(1,293)
Loans charged off, net of recoveries		0		0
Balance, end of period		0		0
Balance, end of period—specific		0		0
Balance, end of period—general		0		0
Average balance of impaired loans and leases		0		0
Interest recognized from impaired loans		0		12
Loans individually evaluated with specific allowance		0		0
Loans individually evaluated with no specific allowance		0		0
Loans collectively evaluated with general allowance		0		0
Total investment evaluated		0		0
Equipment Finance [Member] | Leases [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Average balance of impaired loans and leases		623		698
Business Credit [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Balance, beginning of period				1,991	$ 1,991
Provision (reversal) for credit losses—general				(172)
Provision for credit losses—specific				0
Reversal due to sale of Business Credit				(1,819)
Loans charged off, net of recoveries				0
Balance, end of period		0		0
Balance, end of period—specific		0		0
Balance, end of period—general		$ 0		0
Average balance of impaired loans and leases				0
Interest recognized from impaired loans				0
Business Credit [Member] | Leases [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Average balance of impaired loans and leases				$ 0

Loans Held-for-Sale, Loans, L56

Loans Held-for-Sale, Loans, Leases and Allowance for Credit Losses - Summary Activity in the Allowance for Credit Losses (Parenthetical) (Detail) - USD ($) $ in Millions	Sep. 30, 2017	Sep. 30, 2016
Leveraged Finance [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Fair value of loans acquired	$ 407.6	$ 389.3

Restricted Cash - Summary of Re

Restricted Cash - Summary of Restricted Cash (Detail) - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016
Restricted Cash And Investments [Abstract]
Collections on loans pledged to credit facilities	$ 49,694	$ 43,822
Principal and interest collections on loans held in trust and prefunding amounts	199,156	216,501
Customer escrow accounts	2,803	2,320
Total	$ 251,653	$ 262,643

Restricted Cash - Additional In

Restricted Cash - Additional Information (Detail) $ in Millions	Sep. 30, 2017USD ($)
Restricted Cash And Investments [Abstract]
Restricted cash to fund new or existing loans	$ 170.7

Investments in Debt Securitie59

Investments in Debt Securities, Available-for-Sale - Summary of Amortized Cost of Investments in Debt Securities (Detail) - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016
Investments Debt And Equity Securities [Abstract]
Investments in debt securities—gross	$ 182,422	$ 132,180
Unamortized discount	(9,974)	(6,743)
Investments in debt securities—amortized cost	$ 172,448	$ 125,437

Investments in Debt Securitie60

Investments in Debt Securities, Available-for-Sale - Additional Information (Detail)	3 Months Ended	9 Months Ended
	Sep. 30, 2017USD ($)	Sep. 30, 2017USD ($)	Sep. 30, 2016USD ($)Segment	Dec. 31, 2016USD ($)
Investments Debt And Equity Securities [Abstract]
Investments in non-NewStar managed issuers	$ 74,000,000	$ 74,000,000		$ 75,800,000
Percentage of each class of note securitization		5.00%
Purchase of debt securities	23,100,000	$ 52,700,000
Debt securities purchased to satisfy EU risk retention rules		21,500,000
Proceeds from debt securities, available-for-sale	5,900,000	6,226,000	$ 6,000,000
Paydown of investment in debt securities		500,000
Number of debt securities purchased | Segment			0
Number of debt securities redeemed | Segment			6,000,000
Number of debt securities sold | Segment			0
Net OTTI	$ 0	$ 0

Investments in Debt Securitie61

Investments in Debt Securities, Available-for-Sale - Summary of Amortized Cost, Gross Unrealized Holding Gains, Gross Unrealized Holding Losses, and Fair Value of Available-for-Sale Securities (Detail) - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016
Guarantee Obligations [Line Items]
Investments in debt securities—amortized cost	$ 172,448	$ 125,437
Investments in debt securities - Gross unrealized holding gains	4,350	286
Investments in debt securities - Gross unrealized holding losses	(961)	(6,416)
Investments in debt securities - Fair value	175,837	119,307
Collateralized Loan Obligations [Member]
Guarantee Obligations [Line Items]
Investments in debt securities—amortized cost	172,448	125,437
Investments in debt securities - Gross unrealized holding gains	4,350	286
Investments in debt securities - Gross unrealized holding losses	(961)	(6,416)
Investments in debt securities - Fair value	$ 175,837	$ 119,307

Investments in Debt Securitie62

Investments in Debt Securities, Available-for-Sale - Summary of Unrealized Loss on Investments (Detail) $ in Thousands	Sep. 30, 2017USD ($)Position	Dec. 31, 2016USD ($)Position
Investments Debt And Equity Securities [Abstract]
Number of positions, Less than 12 Months | Position	6	3
Fair value, Less than 12 Months	$ 19,895	$ 4,811
Amortized cost, Less than 12 Months	20,598	4,885
Unrealized loss, Less than 12 Months	$ (703)	$ (74)
Number of positions, Greater than or Equal to 12 Months | Position	2	17
Fair value, Greater than or Equal to 12 Months	$ 3,519	$ 68,737
Amortized cost, Greater than or Equal to 12 Months	3,777	75,079
Unrealized loss, Greater than or Equal to 12 Months	$ (258)	$ (6,342)
Number of positions | Position	8	20
Fair value	$ 23,414	$ 73,548
Amortized cost	24,375	79,964
Unrealized loss	$ (961)	$ (6,416)

Investments in Debt Securitie63

Investments in Debt Securities, Available-for-Sale - Summary of Maturities of Debt Securities (Detail) - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016
Investments Debt And Equity Securities [Abstract]
Amortized cost, Available-for-sale, Due one year or less		$ 91
Amortized cost, Available-for-sale, Due after five years through ten years	$ 120,183	53,177
Amortized cost, Available-for-sale, Due after ten years through fifteen years	52,265	72,169
Investments in debt securities—amortized cost	172,448	125,437
Fair value, Available-for-sale, Due one year or less		20
Fair value, Available-for-sale, Due after five years through ten years	123,592	48,404
Fair value, Available-for-sale, Due after ten years through fifteen years	52,245	70,883
Fair value	$ 175,837	$ 119,307

Borrowings - Credit Facilities

Borrowings - Credit Facilities - Additional Information (Detail)	9 Months Ended
	Sep. 30, 2017USD ($)CreditFacility	Dec. 31, 2016USD ($)
Line of Credit Facility [Line Items]
Number of credit facility | CreditFacility	2
Outstanding balance of credit facility	$ 456,961,000	$ 445,493,000
Wells Fargo Bank, National Association [Member] | Revolving Credit Facility, Leveraged Finance Loans [Member]
Line of Credit Facility [Line Items]
Current borrowing capacity of credit facility	615,000,000
Outstanding balance of credit facility	368,900,000
Unamortized deferred financing fees	$ 5,000,000
Reinvestment period expiration date	Aug. 10, 2018
Amortization period of credit facility	2 years
Maturity date of facility	Aug. 10, 2020
Citibank, N.A. [Member] | Revolving Credit Facility, Leveraged Finance Loans [Member]
Line of Credit Facility [Line Items]
Amount of credit facility	$ 250,000,000
Outstanding balance of credit facility	95,000,000
Unamortized deferred financing fees	$ 1,900,000
Reinvestment period expiration date	May 5, 2018
Amortization period of credit facility	2 years
Maturity date of facility	May 5, 2020

Borrowings - Senior Notes - Add

Borrowings - Senior Notes - Additional Information (Detail) - 7.25% Senior Notes Due 2020 [Member] - USD ($)	Apr. 22, 2015	Sep. 30, 2017	Nov. 09, 2015
Line of Credit Facility [Line Items]
Debt instrument face amount	$ 300,000,000		$ 80,000,000
Debt instrument, interest rate (percent)	7.25%
Unamortized discount			$ 800,000
Debt instrument maturity date		May 1, 2020
Debt instrument, frequency of periodic payment		payable semi-annually on May 1 and November 1 of each year
Debt instrument redemption description		On or after May 1, 2017, the Company may redeem the 2020 Notes, in whole or in part, at redemption prices specified in the 2020 Notes plus accrued and unpaid interest thereon. In addition, if the Company undergoes a change of control, the Company will be required to make an offer to purchase each holder’s 2020 Notes at a price equal to 101% of the principal amount of the 2020 Notes, plus accrued and unpaid interest.
Percentage of principal amount, redemption price	101.00%
Unamortized deferred financing fees		$ 4,300,000

Borrowings - Subordinated Notes

Borrowings - Subordinated Notes - Additional Information (Detail) - Franklin Square [Member] - Subordinated Notes [Member] - USD ($)	Dec. 04, 2014	Jan. 31, 2016	Sep. 30, 2017	Dec. 31, 2015	Dec. 31, 2016
Debt Instrument [Line Items]
Debt instrument face amount	$ 200,000,000
Debt Instrument, Term (in years)	10 years
Debt Instrument, additional amount borrowed				$ 75,000,000
Debt Instrument, remaining borrowings		$ 25,000,000
Warrants and Rights Outstanding			$ 48,600,000		$ 53,700,000
Unamortized deferred financing fees			$ 4,400,000
Debt instrument, interest rate (percent)	8.25%
Debt Instrument, Paid-In-Kind Stated Interest Rate (percent)	8.75%
Debt instrument maturity date			Dec. 4, 2024
Debt Instrument, Redemption, Period One [Member]
Debt Instrument [Line Items]
Debt Instrument, Redemption Period With Make-Whole Premium (in years)	3 years
Debt Instrument, Redemption, Period Two [Member]
Debt Instrument [Line Items]
Debt Instrument, Redemption Price, Percentage	103.00%
Debt Instrument, Redemption, Period Three [Member]
Debt Instrument [Line Items]
Debt Instrument, Redemption Price, Percentage	101.00%

Borrowings - Summary of Borrowi

Borrowings - Summary of Borrowings (Detail) - USD ($)	Mar. 20, 2017	Sep. 30, 2017	Dec. 31, 2016	Sep. 15, 2016	Mar. 02, 2016	Sep. 15, 2015	Jun. 12, 2015	Mar. 20, 2015	Apr. 17, 2014	Dec. 18, 2012
Financial Instruments Owned and Pledged as Collateral [Line Items]
Term debt, net		$ 16,973,000
Term debt securitizations, net		2,085,733,000	$ 2,195,064,000
Natixis Term Debt [Member]
Financial Instruments Owned and Pledged as Collateral [Line Items]
Term debt, net		16,973,000
2012-2 CLO [Member]
Financial Instruments Owned and Pledged as Collateral [Line Items]
Notes originally issued		279,600,000								$ 263,300,000
Term debt securitizations, net		142,283,000
2014-1 CLO [Member]
Financial Instruments Owned and Pledged as Collateral [Line Items]
Notes originally issued		289,500,000							$ 289,500,000
Term debt securitizations, net		289,500,000
2015-1 CLO [Member]
Financial Instruments Owned and Pledged as Collateral [Line Items]
Notes originally issued		410,250,000						$ 410,300,000
Term debt securitizations, net		410,250,000
2015-2 CLO [Member]
Financial Instruments Owned and Pledged as Collateral [Line Items]
Notes originally issued		327,750,000				$ 327,800,000
Term debt securitizations, net		327,750,000
2016-1 CLO [Member]
Financial Instruments Owned and Pledged as Collateral [Line Items]
Notes originally issued		263,250,000			$ 255,800,000
Term debt securitizations, net		263,250,000
Arch Street CLO [Member]
Financial Instruments Owned and Pledged as Collateral [Line Items]
Notes originally issued		370,250,000		$ 370,300,000
Term debt securitizations, net		367,750,000
2017-1 CLO [Member]
Financial Instruments Owned and Pledged as Collateral [Line Items]
Notes originally issued	$ 328,000,000	328,000,000
Term debt securitizations, net	$ 303,000,000	303,000,000
Class A-1 [Member] | Natixis Term Debt [Member]
Financial Instruments Owned and Pledged as Collateral [Line Items]
Term debt, net		$ 12,972,000
Interest rate		Libor + 1.92%
Class A-1 [Member] | Natixis Term Debt [Member] | London Interbank Offered Rate (LIBOR) [Member]
Financial Instruments Owned and Pledged as Collateral [Line Items]
Basis Spread on Variable Rate		1.92%
Class A-1 [Member] | 2015-1 CLO [Member]
Financial Instruments Owned and Pledged as Collateral [Line Items]
Interest rate		Libor+1.80%
Notes originally issued		$ 253,500,000
Term debt securitizations, net		$ 253,500,000
Legal final maturity		Jan. 20, 2027
Class A-1 [Member] | 2015-1 CLO [Member] | London Interbank Offered Rate (LIBOR) [Member]
Financial Instruments Owned and Pledged as Collateral [Line Items]
Basis Spread on Variable Rate		1.80%
Class A-1 [Member] | 2015-2 CLO [Member]
Financial Instruments Owned and Pledged as Collateral [Line Items]
Interest rate		Libor+2.00%
Notes originally issued		$ 205,000,000
Term debt securitizations, net		$ 205,000,000
Legal final maturity		Aug. 25, 2027
Class A-1 [Member] | 2015-2 CLO [Member] | London Interbank Offered Rate (LIBOR) [Member]
Financial Instruments Owned and Pledged as Collateral [Line Items]
Basis Spread on Variable Rate		2.00%
Class A-1 [Member] | 2016-1 CLO [Member]
Financial Instruments Owned and Pledged as Collateral [Line Items]
Interest rate		Libor+2.30%
Notes originally issued		$ 176,500,000
Term debt securitizations, net		$ 176,500,000
Legal final maturity		Feb. 25, 2028
Class A-1 [Member] | 2016-1 CLO [Member] | London Interbank Offered Rate (LIBOR) [Member]
Financial Instruments Owned and Pledged as Collateral [Line Items]
Basis Spread on Variable Rate		2.30%
Class A-2 [Member] | Natixis Term Debt [Member]
Financial Instruments Owned and Pledged as Collateral [Line Items]
Term debt, net		$ 1,597,000
Interest rate		Libor + 2.81%
Class A-2 [Member] | Natixis Term Debt [Member] | London Interbank Offered Rate (LIBOR) [Member]
Financial Instruments Owned and Pledged as Collateral [Line Items]
Basis Spread on Variable Rate		2.81%
Class A-2 [Member] | 2015-1 CLO [Member]
Financial Instruments Owned and Pledged as Collateral [Line Items]
Notes originally issued		$ 35,000,000
Term debt securitizations, net		$ 35,000,000
Legal final maturity		Jan. 20, 2027
Class A-2 [Member] | 2015-1 CLO [Member] | London Interbank Offered Rate (LIBOR) [Member]
Financial Instruments Owned and Pledged as Collateral [Line Items]
Basis Spread on Variable Rate	2.00%	1.65%
Class A-2 [Member] | 2015-2 CLO [Member]
Financial Instruments Owned and Pledged as Collateral [Line Items]
Notes originally issued		$ 23,000,000
Term debt securitizations, net		$ 23,000,000
Legal final maturity		Aug. 25, 2027
Accrue interest at fixed rate		3.461%
Class A-2 [Member] | 2016-1 CLO [Member]
Financial Instruments Owned and Pledged as Collateral [Line Items]
Notes originally issued		$ 20,000,000
Term debt securitizations, net		$ 20,000,000
Legal final maturity		Feb. 25, 2028
Accrue interest at fixed rate		3.44%
Class B | Natixis Term Debt [Member]
Financial Instruments Owned and Pledged as Collateral [Line Items]
Term debt, net		$ 1,552,000
Interest rate		Libor + 3.72%
Class B | Natixis Term Debt [Member] | London Interbank Offered Rate (LIBOR) [Member]
Financial Instruments Owned and Pledged as Collateral [Line Items]
Basis Spread on Variable Rate		3.72%
Class B | 2012-2 CLO [Member]
Financial Instruments Owned and Pledged as Collateral [Line Items]
Interest rate		Libor+3.25%
Notes originally issued		$ 26,000,000
Term debt securitizations, net		$ 26,000,000
Legal final maturity		Jan. 20, 2023
Class B | 2012-2 CLO [Member] | London Interbank Offered Rate (LIBOR) [Member]
Financial Instruments Owned and Pledged as Collateral [Line Items]
Basis Spread on Variable Rate		3.25%
Class B | 2015-1 CLO [Member]
Financial Instruments Owned and Pledged as Collateral [Line Items]
Interest rate		Libor+2.80%
Notes originally issued		$ 50,000,000
Term debt securitizations, net		$ 50,000,000
Legal final maturity		Jan. 20, 2027
Class B | 2015-1 CLO [Member] | London Interbank Offered Rate (LIBOR) [Member]
Financial Instruments Owned and Pledged as Collateral [Line Items]
Basis Spread on Variable Rate		2.80%
Class B | 2015-2 CLO [Member]
Financial Instruments Owned and Pledged as Collateral [Line Items]
Interest rate		Libor+2.90%
Notes originally issued		$ 40,000,000
Term debt securitizations, net		$ 40,000,000
Legal final maturity		Aug. 25, 2027
Class B | 2015-2 CLO [Member] | London Interbank Offered Rate (LIBOR) [Member]
Financial Instruments Owned and Pledged as Collateral [Line Items]
Basis Spread on Variable Rate		2.90%
Class B | 2016-1 CLO [Member]
Financial Instruments Owned and Pledged as Collateral [Line Items]
Interest rate		Libor+3.75%
Notes originally issued		$ 36,750,000
Term debt securitizations, net		$ 36,750,000
Legal final maturity		Feb. 25, 2028
Class B | 2016-1 CLO [Member] | London Interbank Offered Rate (LIBOR) [Member]
Financial Instruments Owned and Pledged as Collateral [Line Items]
Basis Spread on Variable Rate		3.75%
Class B | Arch Street CLO [Member]
Financial Instruments Owned and Pledged as Collateral [Line Items]
Interest rate		Libor+2.24%
Notes originally issued		$ 48,000,000
Term debt securitizations, net		$ 48,000,000
Legal final maturity		Oct. 20, 2028
Class B | Arch Street CLO [Member] | London Interbank Offered Rate (LIBOR) [Member]
Financial Instruments Owned and Pledged as Collateral [Line Items]
Basis Spread on Variable Rate		2.24%
Class C [Member] | Natixis Term Debt [Member]
Financial Instruments Owned and Pledged as Collateral [Line Items]
Term debt, net		$ 852,000
Interest rate		Libor + 4.85%
Class C [Member] | Natixis Term Debt [Member] | London Interbank Offered Rate (LIBOR) [Member]
Financial Instruments Owned and Pledged as Collateral [Line Items]
Basis Spread on Variable Rate		4.85%
Class C [Member] | 2012-2 CLO [Member]
Financial Instruments Owned and Pledged as Collateral [Line Items]
Interest rate		Libor+4.25%
Notes originally issued		$ 35,200,000
Term debt securitizations, net		$ 35,200,000
Legal final maturity		Jan. 20, 2023
Class C [Member] | 2012-2 CLO [Member] | London Interbank Offered Rate (LIBOR) [Member]
Financial Instruments Owned and Pledged as Collateral [Line Items]
Basis Spread on Variable Rate		4.25%
Class C [Member] | 2014-1 CLO [Member]
Financial Instruments Owned and Pledged as Collateral [Line Items]
Interest rate		Libor+3.60%
Notes originally issued		$ 30,250,000
Term debt securitizations, net		$ 30,250,000
Legal final maturity		Apr. 20, 2025
Class C [Member] | 2014-1 CLO [Member] | London Interbank Offered Rate (LIBOR) [Member]
Financial Instruments Owned and Pledged as Collateral [Line Items]
Basis Spread on Variable Rate		3.60%
Class C [Member] | 2015-1 CLO [Member]
Financial Instruments Owned and Pledged as Collateral [Line Items]
Interest rate		Libor+3.85%
Notes originally issued		$ 38,500,000
Term debt securitizations, net		$ 38,500,000
Legal final maturity		Jan. 20, 2027
Class C [Member] | 2015-1 CLO [Member] | London Interbank Offered Rate (LIBOR) [Member]
Financial Instruments Owned and Pledged as Collateral [Line Items]
Basis Spread on Variable Rate		3.85%
Class C [Member] | 2015-2 CLO [Member]
Financial Instruments Owned and Pledged as Collateral [Line Items]
Interest rate		Libor+3.95%
Notes originally issued		$ 26,250,000
Term debt securitizations, net		$ 26,250,000
Legal final maturity		Aug. 25, 2027
Class C [Member] | 2015-2 CLO [Member] | London Interbank Offered Rate (LIBOR) [Member]
Financial Instruments Owned and Pledged as Collateral [Line Items]
Basis Spread on Variable Rate		3.95%
Class C [Member] | 2016-1 CLO [Member]
Financial Instruments Owned and Pledged as Collateral [Line Items]
Interest rate		Libor+5.40%
Notes originally issued		$ 22,500,000
Term debt securitizations, net		$ 22,500,000
Legal final maturity		Feb. 25, 2028
Class C [Member] | 2016-1 CLO [Member] | London Interbank Offered Rate (LIBOR) [Member]
Financial Instruments Owned and Pledged as Collateral [Line Items]
Basis Spread on Variable Rate		5.40%
Class C [Member] | Arch Street CLO [Member]
Financial Instruments Owned and Pledged as Collateral [Line Items]
Interest rate		Libor+3.00%
Notes originally issued		$ 20,000,000
Term debt securitizations, net		$ 20,000,000
Legal final maturity		Oct. 20, 2028
Class C [Member] | Arch Street CLO [Member] | London Interbank Offered Rate (LIBOR) [Member]
Financial Instruments Owned and Pledged as Collateral [Line Items]
Basis Spread on Variable Rate		3.00%
Class A [Member] | 2012-2 CLO [Member]
Financial Instruments Owned and Pledged as Collateral [Line Items]
Interest rate		Libor+1.90%
Notes originally issued		$ 190,700,000
Term debt securitizations, net		$ 53,383,000
Legal final maturity		Jan. 20, 2023
Class A [Member] | 2012-2 CLO [Member] | London Interbank Offered Rate (LIBOR) [Member]
Financial Instruments Owned and Pledged as Collateral [Line Items]
Basis Spread on Variable Rate		1.90%
Class A [Member] | 2014-1 CLO [Member]
Financial Instruments Owned and Pledged as Collateral [Line Items]
Interest rate		Libor+1.80%
Notes originally issued		$ 202,500,000
Term debt securitizations, net		$ 202,500,000
Legal final maturity		Apr. 20, 2025
Class A [Member] | 2014-1 CLO [Member] | London Interbank Offered Rate (LIBOR) [Member]
Financial Instruments Owned and Pledged as Collateral [Line Items]
Basis Spread on Variable Rate		1.80%
Class A [Member] | Arch Street CLO [Member]
Financial Instruments Owned and Pledged as Collateral [Line Items]
Interest rate		Libor+1.65%
Notes originally issued		$ 256,000,000
Term debt securitizations, net		$ 256,000,000
Legal final maturity		Oct. 20, 2028
Class A [Member] | Arch Street CLO [Member] | London Interbank Offered Rate (LIBOR) [Member]
Financial Instruments Owned and Pledged as Collateral [Line Items]
Basis Spread on Variable Rate		1.65%
Class D [Member] | 2012-2 CLO [Member]
Financial Instruments Owned and Pledged as Collateral [Line Items]
Interest rate		Libor+6.25%
Notes originally issued		$ 11,400,000
Term debt securitizations, net		$ 11,400,000
Legal final maturity		Jan. 20, 2023
Class D [Member] | 2012-2 CLO [Member] | London Interbank Offered Rate (LIBOR) [Member]
Financial Instruments Owned and Pledged as Collateral [Line Items]
Basis Spread on Variable Rate		6.25%
Class D [Member] | 2014-1 CLO [Member]
Financial Instruments Owned and Pledged as Collateral [Line Items]
Interest rate		Libor+4.75%
Notes originally issued		$ 23,500,000
Term debt securitizations, net		$ 23,500,000
Legal final maturity		Apr. 20, 2025
Class D [Member] | 2014-1 CLO [Member] | London Interbank Offered Rate (LIBOR) [Member]
Financial Instruments Owned and Pledged as Collateral [Line Items]
Basis Spread on Variable Rate		4.75%
Class D [Member] | 2015-1 CLO [Member]
Financial Instruments Owned and Pledged as Collateral [Line Items]
Interest rate		Libor+5.50%
Notes originally issued		$ 33,250,000
Term debt securitizations, net		$ 33,250,000
Legal final maturity		Jan. 20, 2027
Class D [Member] | 2015-1 CLO [Member] | London Interbank Offered Rate (LIBOR) [Member]
Financial Instruments Owned and Pledged as Collateral [Line Items]
Basis Spread on Variable Rate		5.50%
Class D [Member] | 2015-2 CLO [Member]
Financial Instruments Owned and Pledged as Collateral [Line Items]
Interest rate		Libor+5.25%
Notes originally issued		$ 28,500,000
Term debt securitizations, net		$ 28,500,000
Legal final maturity		Aug. 25, 2027
Class D [Member] | 2015-2 CLO [Member] | London Interbank Offered Rate (LIBOR) [Member]
Financial Instruments Owned and Pledged as Collateral [Line Items]
Basis Spread on Variable Rate		5.25%
Class D [Member] | 2016-1 CLO [Member]
Financial Instruments Owned and Pledged as Collateral [Line Items]
Interest rate		Libor+5.50%
Notes originally issued		$ 7,500,000
Term debt securitizations, net		$ 7,500,000
Legal final maturity		Feb. 25, 2028
Class D [Member] | 2016-1 CLO [Member] | London Interbank Offered Rate (LIBOR) [Member]
Financial Instruments Owned and Pledged as Collateral [Line Items]
Basis Spread on Variable Rate		5.50%
Class D [Member] | Arch Street CLO [Member]
Financial Instruments Owned and Pledged as Collateral [Line Items]
Interest rate		Libor+4.20%
Notes originally issued		$ 22,750,000
Term debt securitizations, net		$ 22,750,000
Legal final maturity		Oct. 20, 2028
Class D [Member] | Arch Street CLO [Member] | London Interbank Offered Rate (LIBOR) [Member]
Financial Instruments Owned and Pledged as Collateral [Line Items]
Basis Spread on Variable Rate		4.20%
Class E [Member] | 2012-2 CLO [Member]
Financial Instruments Owned and Pledged as Collateral [Line Items]
Interest rate		Libor+6.75%
Notes originally issued		$ 16,300,000					$ 16,300,000
Term debt securitizations, net		$ 16,300,000
Legal final maturity		Jan. 20, 2023
Class E [Member] | 2012-2 CLO [Member] | London Interbank Offered Rate (LIBOR) [Member]
Financial Instruments Owned and Pledged as Collateral [Line Items]
Basis Spread on Variable Rate		6.75%
Class E [Member] | 2015-2 CLO [Member]
Financial Instruments Owned and Pledged as Collateral [Line Items]
Interest rate		Libor+7.50%
Notes originally issued		$ 5,000,000
Term debt securitizations, net		$ 5,000,000
Legal final maturity		Aug. 25, 2027
Class E [Member] | 2015-2 CLO [Member] | London Interbank Offered Rate (LIBOR) [Member]
Financial Instruments Owned and Pledged as Collateral [Line Items]
Basis Spread on Variable Rate		7.50%
Class E [Member] | Arch Street CLO [Member]
Financial Instruments Owned and Pledged as Collateral [Line Items]
Interest rate		Libor+6.95%
Notes originally issued		$ 21,000,000
Term debt securitizations, net		$ 21,000,000
Legal final maturity		Oct. 20, 2028
Class E [Member] | Arch Street CLO [Member] | London Interbank Offered Rate (LIBOR) [Member]
Financial Instruments Owned and Pledged as Collateral [Line Items]
Basis Spread on Variable Rate		6.95%
Class B-1 [Member] | 2014-1 CLO [Member]
Financial Instruments Owned and Pledged as Collateral [Line Items]
Interest rate		Libor+2.60%
Notes originally issued		$ 20,000,000
Term debt securitizations, net		$ 20,000,000
Legal final maturity		Apr. 20, 2025
Class B-1 [Member] | 2014-1 CLO [Member] | London Interbank Offered Rate (LIBOR) [Member]
Financial Instruments Owned and Pledged as Collateral [Line Items]
Basis Spread on Variable Rate		2.60%
Class B-2 [Member] | 2014-1 CLO [Member]
Financial Instruments Owned and Pledged as Collateral [Line Items]
Notes originally issued		$ 13,250,000
Term debt securitizations, net		$ 13,250,000
Legal final maturity		Apr. 20, 2025
Accrue interest at fixed rate		4.902%
Class X [Member] | Arch Street CLO [Member]
Financial Instruments Owned and Pledged as Collateral [Line Items]
Interest rate		Libor+1.25%
Notes originally issued		$ 2,500,000
Legal final maturity		Oct. 20, 2028
Class X [Member] | Arch Street CLO [Member] | London Interbank Offered Rate (LIBOR) [Member]
Financial Instruments Owned and Pledged as Collateral [Line Items]
Basis Spread on Variable Rate		1.25%
Class A-T-N [Member] | 2017-1 CLO [Member]
Financial Instruments Owned and Pledged as Collateral [Line Items]
Interest rate		Libor+1.78%
Notes originally issued		$ 207,000,000
Term debt securitizations, net		$ 207,000,000
Legal final maturity		Sep. 22, 2027
Class A-T-N [Member] | 2017-1 CLO [Member] | London Interbank Offered Rate (LIBOR) [Member]
Financial Instruments Owned and Pledged as Collateral [Line Items]
Basis Spread on Variable Rate		1.78%
Class A-R-N [Member] | 2017-1 CLO [Member]
Financial Instruments Owned and Pledged as Collateral [Line Items]
Interest rate		Libor+1.78%
Notes originally issued		$ 25,000,000
Legal final maturity		Sep. 22, 2027
Class A-R-N [Member] | 2017-1 CLO [Member] | London Interbank Offered Rate (LIBOR) [Member]
Financial Instruments Owned and Pledged as Collateral [Line Items]
Basis Spread on Variable Rate		1.78%
Class B-N [Member] | 2017-1 CLO [Member]
Financial Instruments Owned and Pledged as Collateral [Line Items]
Interest rate		Libor+2.50%
Notes originally issued		$ 40,000,000
Term debt securitizations, net		$ 40,000,000
Legal final maturity		Sep. 22, 2027
Class B-N [Member] | 2017-1 CLO [Member] | London Interbank Offered Rate (LIBOR) [Member]
Financial Instruments Owned and Pledged as Collateral [Line Items]
Basis Spread on Variable Rate		2.50%
Class C-N [Member] | 2017-1 CLO [Member]
Financial Instruments Owned and Pledged as Collateral [Line Items]
Interest rate		Libor+3.50%
Notes originally issued		$ 32,000,000
Term debt securitizations, net		$ 32,000,000
Legal final maturity		Sep. 22, 2027
Class C-N [Member] | 2017-1 CLO [Member] | London Interbank Offered Rate (LIBOR) [Member]
Financial Instruments Owned and Pledged as Collateral [Line Items]
Basis Spread on Variable Rate		3.50%
Class D-N [Member] | 2017-1 CLO [Member]
Financial Instruments Owned and Pledged as Collateral [Line Items]
Interest rate		Libor+5.10%
Notes originally issued		$ 24,000,000
Term debt securitizations, net		$ 24,000,000
Legal final maturity		Sep. 22, 2027
Class D-N [Member] | 2017-1 CLO [Member] | London Interbank Offered Rate (LIBOR) [Member]
Financial Instruments Owned and Pledged as Collateral [Line Items]
Basis Spread on Variable Rate		5.10%

Borrowings - Term Debt Securiti

Borrowings - Term Debt Securitizations - Additional Information (Detail) - USD ($)	Sep. 15, 2016	Mar. 02, 2016	Sep. 15, 2015	Mar. 20, 2015	Apr. 17, 2014	Dec. 18, 2012	Sep. 30, 2017	Mar. 20, 2017	Dec. 31, 2016	Jun. 12, 2015
Debt Instrument [Line Items]
Outstanding balance on drawn notes							$ 2,085,733,000		$ 2,195,064,000
2012-2 CLO [Member]
Debt Instrument [Line Items]
Loans and investments provided to bankruptcy remote subsidiary						$ 325,900,000
Notes issued or additional notes to institutional investors						$ 263,300,000	279,600,000
Notes issued and retained as trust certificate percentage						100.00%
Outstanding balance on drawn notes							142,283,000
Principal collection and payments receivable of secured debt							188,600,000
Unamortized deferred financing fees							$ 200,000
Collateral principal repayments maturity period							3 years
Collateral principal repayments expiration							2016-01
2012-2 CLO [Member] | Trust Certificates [Member]
Debt Instrument [Line Items]
Notes issued or additional notes to institutional investors						$ 62,600,000
2012-2 CLO [Member] | Class E [Member]
Debt Instrument [Line Items]
Notes issued or additional notes to institutional investors							$ 16,300,000			$ 16,300,000
Outstanding balance on drawn notes							16,300,000
2014-1 CLO [Member]
Debt Instrument [Line Items]
Loans and investments provided to bankruptcy remote subsidiary					$ 249,600,000
Notes issued or additional notes to institutional investors					$ 289,500,000		289,500,000
Notes issued and retained as trust certificate percentage					100.00%
Outstanding balance on drawn notes							289,500,000
Principal collection and payments receivable of secured debt							348,400,000
Unamortized deferred financing fees							$ 1,500,000
Collateral principal repayments maturity period							4 years
Collateral principal repayments expiration							2018-04
2014-1 CLO [Member] | Trust Certificates [Member]
Debt Instrument [Line Items]
Notes issued or additional notes to institutional investors					$ 58,900,000
2015-1 CLO [Member]
Debt Instrument [Line Items]
Loans and investments provided to bankruptcy remote subsidiary				$ 336,300,000
Notes issued or additional notes to institutional investors				$ 410,300,000			$ 410,250,000
Notes issued and retained as trust certificate percentage				100.00%
Outstanding balance on drawn notes							410,250,000
Principal collection and payments receivable of secured debt							496,100,000
Unamortized deferred financing fees							$ 2,600,000
Collateral principal repayments maturity period							4 years
Collateral principal repayments expiration							2019-04
2015-1 CLO [Member] | Trust Certificates [Member]
Debt Instrument [Line Items]
Notes issued or additional notes to institutional investors				$ 85,800,000
2015-2 CLO [Member]
Debt Instrument [Line Items]
Loans and investments provided to bankruptcy remote subsidiary			$ 298,400,000
Notes issued or additional notes to institutional investors			$ 327,800,000				$ 327,750,000
Notes issued and retained as trust certificate percentage			100.00%
Outstanding balance on drawn notes							327,750,000
Principal collection and payments receivable of secured debt							397,800,000
Unamortized deferred financing fees							$ 2,400,000
Collateral principal repayments maturity period							4 years
Collateral principal repayments expiration							2019-08
2015-2 CLO [Member] | Trust Certificates [Member]
Debt Instrument [Line Items]
Notes issued or additional notes to institutional investors			$ 70,100,000
2015-2 CLO [Member] | Class E [Member]
Debt Instrument [Line Items]
Notes issued or additional notes to institutional investors							$ 5,000,000
Outstanding balance on drawn notes							5,000,000
2016-1 CLO [Member]
Debt Instrument [Line Items]
Loans and investments provided to bankruptcy remote subsidiary		$ 247,300,000
Notes issued or additional notes to institutional investors		$ 255,800,000					263,250,000
Notes issued and retained as trust certificate percentage		100.00%
Outstanding balance on drawn notes							263,250,000
Principal collection and payments receivable of secured debt							348,000,000
Unamortized deferred financing fees							$ 2,100,000
Collateral principal repayments maturity period							4 years
Collateral principal repayments expiration							2020-02
2016-1 CLO [Member] | Trust Certificates [Member]
Debt Instrument [Line Items]
Notes issued or additional notes to institutional investors		$ 92,200,000
Arch Street CLO [Member]
Debt Instrument [Line Items]
Notes issued or additional notes to institutional investors	$ 370,300,000						$ 370,250,000
Notes issued and retained as trust certificate percentage	9.60%
Outstanding balance on drawn notes							367,750,000
Unamortized deferred financing fees							$ 3,700,000
Collateral principal repayments expiration							2020-10
Completion of syndicated loan securitization	$ 409,800,000
Collateralized principal repayments scheduled maturity date							2028-10
Arch Street CLO [Member] | Trust Certificates [Member]
Debt Instrument [Line Items]
Notes issued or additional notes to institutional investors	$ 39,500,000
Notes issued and retained as trust certificate percentage	90.40%
Arch Street CLO [Member] | Class E [Member]
Debt Instrument [Line Items]
Notes issued or additional notes to institutional investors							$ 21,000,000
Outstanding balance on drawn notes							21,000,000
2013-1 CLO [Member]
Debt Instrument [Line Items]
Unamortized deferred financing fees								$ 300,000
2017-1 CLO [Member]
Debt Instrument [Line Items]
Notes issued or additional notes to institutional investors							328,000,000	328,000,000
Outstanding balance on drawn notes							$ 303,000,000	303,000,000
Principal collection and payments receivable of secured debt								372,300,000
Unamortized deferred financing fees								3,000,000
Collateral principal repayments expiration							2019-03
Collateralized principal repayments scheduled maturity date							2027-10
2017-1 CLO [Member] | Trust Certificates [Member]
Debt Instrument [Line Items]
Notes issued or additional notes to institutional investors								$ 69,300,000

Repurchase Agreements - Additio

Repurchase Agreements - Additional Information (Detail)	Sep. 30, 2017USD ($)
Deutsche Bank AG [Member]
Assets Sold under Agreements to Repurchase [Line Items]
Repurchase agreements, outstanding at end of period	$ 0
Citigroup Global Markets [Member]
Assets Sold under Agreements to Repurchase [Line Items]
Repurchase agreements, outstanding at end of period	49,600,000
JP Morgan Chase Bank [Member]
Assets Sold under Agreements to Repurchase [Line Items]
Repurchase agreements, outstanding at end of period	29,100,000
Natixis Securities Americas LLC [Member]
Assets Sold under Agreements to Repurchase [Line Items]
Repurchase agreements, outstanding at end of period	$ 1,900,000

Stockholders' Equity - Schedule

Stockholders' Equity - Schedule of Authorized Capital (Detail) - shares	Sep. 30, 2017	Dec. 31, 2016
Equity [Abstract]
Preferred stock, shares authorized	5,000,000	5,000,000
Common stock, shares authorized	145,000,000	145,000,000
Preferred stock, shares outstanding	0	0
Common stock, shares outstanding	41,480,754	42,820,198

Stockholders' Equity - Addition

Stockholders' Equity - Additional Information (Detail)

Sep. 15, 2017$ / shares

Jul. 31, 2017$ / shares

Jun. 15, 2017$ / shares

May 02, 2017$ / shares

Mar. 17, 2017$ / shares

Feb. 14, 2017$ / shares

Dec. 09, 2016USD ($)

Sep. 30, 2017USD ($)$ / sharesshares

Sep. 30, 2016USD ($)

Sep. 30, 2017USD ($)Installment$ / sharesshares

Sep. 30, 2016USD ($)

Dec. 31, 2016$ / sharesshares

Jan. 23, 2015shares

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

Preferred stock, shares authorized

5,000,000

5,000,000

5,000,000

Preferred stock, par value (in dollars per share) | $ / shares

$ 0.01

$ 0.01

$ 0.01

Common stock authorized to repurchase (up to) | $

$ 30,000,000

Repurchase program expiration date

Dec. 31, 2017

Repurchase of stock, shares

1,740,154

Common stock, dividends, per share | $ / shares

$ 0.02

$ 0.02

$ 0.02

$ 0.02

$ 0.06

Common stock, cash dividend paid per share | $ / shares

$ 0.02

$ 0.02

$ 0.02

Date of cash dividend declared to stockholders

Jul. 31, 2017

May 2, 2017

Feb. 14, 2017

Date of payment of cash dividend to stockholders

Sep. 15, 2017

Jun. 15, 2017

Mar. 17, 2017

Date of record of cash dividend paid to stockholders

Aug. 29, 2017

Restricted Stock [Member]

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

Number of equal installments of issued restricted stock that will be made to employees | Installment

3

Award vesting period

3 years

Stock-based compensation expense | $

$ 900,000

$ 1,000,000

$ 2,600,000

$ 2,800,000

Unrecognized compensation cost | $

$ 2,900,000

$ 2,900,000

Weighted average recognition period for unrecognized compensation cost

3 years

Restricted Stock [Member] | 2006 Incentive Plan [Member]

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

Shares issued to employees

284,241

Shares issued to members of board of directors

56,698

Options [Member]

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

Shares subject to stock option description

not be less than 100% of the fair market value of the common stock on the date of the grant

Franklin Square Capital Partners [Member]

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

Number of common shares called by the issued warrants

12,000,000

Impact of cumulative adjustments on change in exercise price percentage

1.00%

Second Tranche Warrants [Member] | Franklin Square Capital Partners [Member]

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

Number of common shares called by the issued warrants

2,500,000

Weighted Average [Member]

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

Common stock weighted average price per share (in dollars per share) | $ / shares

$ 10.17

Minimum [Member] | Options [Member]

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

Purchase price of common stock as a percentage of fair market value

100.00%

Stockholders' Equity - Schedu72

Stockholders' Equity - Schedule of Restricted Stock Activity (Detail) - Restricted Stock [Member] $ in Thousands	9 Months Ended
	Sep. 30, 2017USD ($)shares
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]
Shares, Non-vested, Beginning balance | shares	840,834
Shares, Granted | shares	340,939
Shares, Vested | shares	(384,473)
Shares, Forfeited | shares	(7,333)
Shares, Non-vested, Ending balance | shares	789,967
Share-Based Compensation Arrangement By Share-Based Payment Award, Equity Instruments Other Than Options, Grant Date Fair Value [Roll Forward]
Weighted average grant-date fair value, Non-vested, Beginning balance | $	$ 6,564
Weighted average grant-date fair value, Granted | $	3,350
Weighted average grant-date fair value, Vested | $	(3,209)
Weighted average grant-date fair value, Forfeited | $	(65)
Weighted average grant-date fair value, Non-vested, Ending balance | $	$ 6,640

Stockholders' Equity - Schedu73

Stockholders' Equity - Schedule of Stock Option Activity (Detail)	9 Months Ended
	Sep. 30, 2017shares
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]
Options Outstanding, Beginning balance	421,692
Options Exercised	(286,692)
Options Forfeited	(10,000)
Options Outstanding, Ending Balance	125,000
Options Vested and exercisable as of September 30, 2017	125,000

Earnings Per Share - Computatio

Earnings Per Share - Computations of Basic and Diluted Income Per Share (Detail) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Dilutive and Antidilutive Securities Associated with Computation of Earnings Per Share [Line Items]
Net income	$ 4,585	$ 8,644	$ 10,119	$ 17,894
Net income allocated to participating securities - basic and diluted	87	157	191	302
Net income allocated to common shareholders - basic and diluted	$ 4,498	$ 8,487	$ 9,928	$ 17,592
Denominator for basic earnings per common share	40,786	45,812	41,269	46,216
Total weighted average diluted shares	40,807	45,812	41,289	46,216
Basic	$ 0.11	$ 0.19	$ 0.24	$ 0.38
Diluted	$ 0.11	$ 0.19	$ 0.24	$ 0.38
Options [Member]
Dilutive and Antidilutive Securities Associated with Computation of Earnings Per Share [Line Items]
Potentially dilutive securities-options (in shares)	21		20

Earnings Per Share - Additional

Earnings Per Share - Additional Information (Detail) - shares	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Warrants [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Warrants excluded from earnings per share calculation due to anti-dilutive effect	12,000,000	12,000,000	12,000,000	12,000,000
Options [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Warrants excluded from earnings per share calculation due to anti-dilutive effect				741,845

Variable Interest Entities - Ad

Variable Interest Entities - Additional Information (Detail)	Apr. 18, 2017USD ($)	Nov. 30, 2016USD ($)	Jan. 31, 2015USD ($)	Sep. 30, 2017	Jul. 31, 2017USD ($)	Jul. 20, 2017USD ($)	Oct. 31, 2015LoansFund
Variable Interest Entity [Line Items]
Percentage of each class of note securitization				5.00%
NewStar Exeter Fund CLO LLC [Member] | Class F [Member] | Subordinated Notes [Member]
Variable Interest Entity [Line Items]
Debt instrument face amount					$ 3,900,000	$ 3,900,000
NewStar Fairfield Fund CLO LTD [Member] | Class F [Member] | Subordinated Notes [Member]
Variable Interest Entity [Line Items]
Debt instrument face amount					$ 21,500,000	$ 21,500,000
Feingold O’Keeffe Capital, LLC [Member]
Variable Interest Entity [Line Items]
Number of collateralized loan obligation | Loans							6
Business acquisition date				2015-10
Feingold O’Keeffe Capital, LLC [Member] | Sponsored Funds [Member]
Variable Interest Entity [Line Items]
Number of sponsored funds | Fund							2
Variable interest on secured value sponsored fund							1.00%
NewStar Berkeley Fund CLO LLC [Member]
Variable Interest Entity [Line Items]
Term debt securitization		$ 505,000,000
Percentage of each class of note securitization		5.00%
Each class of note securitization amount, total		$ 25,300,000
NewStar Clarendon Fund CLO LLC [Member]
Variable Interest Entity [Line Items]
Term debt securitization			$ 400,000,000
Percentage of each class of note securitization			5.00%
Each class of note securitization amount, total			$ 20,400,000
Longfellow Fund [Member]
Variable Interest Entity [Line Items]
Term debt securitization	$ 516,900,000
Percentage of each class of note securitization	5.00%
Each class of note securitization amount, total	$ 27,500,000

Variable Interest Entities - Un

Variable Interest Entities - Unconsolidated Variable Interest Entities (Details) - USD ($)	Sep. 30, 2017	Dec. 31, 2016
Organization Consolidation And Presentation Of Financial Statements [Abstract]
Unconsolidated VIE assets	$ 2,104,050,000	$ 912,900,000
Unconsolidated VIE liabilities	1,903,200,000	810,030,000
Equity interest included on the Consolidated Balance Sheet	103,602,000	50,386,000
Maximum risk of loss	$ 105,570,000	$ 50,794,000

Financial Instruments with Of78

Financial Instruments with Off-Balance Sheet Risk - Financial Instruments with Off-Balance Sheet Risk (Detail) - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016
Unused Lines of Credit [Member]
Concentration Risk [Line Items]
Financial instruments with off-balance sheet risk	$ 303,861	$ 326,051
Standby Letters of Credit [Member]
Concentration Risk [Line Items]
Financial instruments with off-balance sheet risk	$ 6,776	$ 8,239

Total Return Swap - Additional

Total Return Swap - Additional Information (Detail) - USD ($)	Jul. 14, 2015	Mar. 02, 2015	Dec. 15, 2014	Dec. 04, 2014	Sep. 30, 2017	Dec. 31, 2016	Mar. 31, 2016
Derivative [Line Items]
Cash collateral on deposit with custodians					$ 7,564,000	$ 7,564,000
Total Return Swap [Member]
Derivative [Line Items]
Derivative termination date					Mar. 31, 2016
Maximum market value of portfolio of loans	$ 175,000,000	$ 150,000,000	$ 125,000,000	$ 75,000,000
Total Return Swap [Member] | Citibank [Member]
Derivative [Line Items]
Cash collateral on deposit with custodians					$ 0	$ 0
Interest rate description					one-month LIBOR plus 1.60% per annum
Total Return Swap [Member] | Citibank [Member] | London Interbank Offered Rate (LIBOR) [Member]
Derivative [Line Items]
Basis spread on variable rate (percent)					1.60%
Total Return Swap [Member] | CLO's [Member]
Derivative [Line Items]
Purchase Price of Loan							$ 138,900,000

Total Return Swap - Schedule of

Total Return Swap - Schedule of Receivable and Realized Loss on Total Return Swap (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	Sep. 30, 2017	Dec. 31, 2016
Derivative [Line Items]
Accrued interest payable		$ (34,435)	$ (21,319)
TRS receivable		$ 15,496	$ 14,622
Total Return Swap [Member]
Derivative [Line Items]
Realized loss on TRS	$ (6,122)
TRS receivable	1,145
Interest income from TRS portfolio	2,355
TRS interest expense	848
Total Return Swap [Member] | Citibank [Member]
Derivative [Line Items]
Accrued interest payable	$ (10,984)

Fair Value - Additional Informa

Fair Value - Additional Information (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016	Dec. 31, 2016
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loss from change in fair value	$ 900		$ 6,800
Realized gain (loss) on sale of loans, net	294	$ (19)	1,501	$ 36
Assets fair value write down expenses			100		$ 300
Non-public investments carrying value within other assets	20,400		20,400		16,000
Collateral-Dependent Commercial Real Estate Loans [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Provision for credit losses related to collateral dependent impaired loans			0		4,300
Provision for credit losses charged off					4,200
Finance Receivables Loans Held For Sale [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Realized gain (loss) on sale of loans, net	$ (500)		$ (600)		$ 2,400

Fair Value - Assets and Liabili

Fair Value - Assets and Liabilities Measured at Fair Value on Recurring and Nonrecurring Basis (Detail) - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments in debt securities, available-for-sale	$ 175,837	$ 119,307
Fair Value, Measurements, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments in debt securities, available-for-sale	175,837	119,307
Loans	407,465	403,745
Total assets recorded at fair value on a recurring basis	583,302	523,052
Contingent consideration liability		1,350
Total liabilities recorded at fair value on a recurring basis		1,350
Fair Value, Measurements, Recurring [Member] | Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans	407,465	403,745
Total assets recorded at fair value on a recurring basis	407,465	403,745
Fair Value, Measurements, Recurring [Member] | Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments in debt securities, available-for-sale	175,837	119,307
Total assets recorded at fair value on a recurring basis	175,837	119,307
Contingent consideration liability		1,350
Total liabilities recorded at fair value on a recurring basis		1,350
Nonrecurring Basis [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans held-for-sale	35,757	6,924
Other real estate owned/repossessed assets	15,600	15,750
Total assets recorded at fair value on a nonrecurring basis	51,357	22,674
Nonrecurring Basis [Member] | Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans held-for-sale	25,219	4,465
Total assets recorded at fair value on a nonrecurring basis	25,219	4,465
Nonrecurring Basis [Member] | Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans held-for-sale	10,538	2,459
Other real estate owned/repossessed assets	15,600	15,750
Total assets recorded at fair value on a nonrecurring basis	$ 26,138	$ 18,209

Fair Value - Summary of Signifi

Fair Value - Summary of Significant Unobservable Inputs and Valuation Techniques (Detail) - USD ($) $ in Thousands	9 Months Ended	12 Months Ended
	Sep. 30, 2017	Dec. 31, 2016	Jun. 30, 2017	Sep. 30, 2016	Jun. 30, 2016	Dec. 31, 2015
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Fair value financial assets	$ 201,975	$ 137,516
Fair value financial liabilities		1,350
Contingent Liability [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Fair value financial liabilities		1,350
Loans Receivable [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Fair value financial assets	$ 10,538	$ 2,459
Loans Receivable [Member] | Minimum [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Fair value discount rate range - cost to sell (percent)	3.00%	3.00%
Fair value discount rate range - marketability discount (as a percent)	5.00%	5.00%
Loans Receivable [Member] | Maximum [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Fair value discount rate range - cost to sell (percent)	7.00%	7.00%
Fair value discount rate range - marketability discount (as a percent)	30.00%	30.00%
Other Real Estate Owned/Repossessed Assets [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Fair value financial assets	$ 15,600	$ 15,750
Other Real Estate Owned/Repossessed Assets [Member] | Minimum [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Fair value discount rate range - cost to sell (percent)	3.00%	3.00%
Other Real Estate Owned/Repossessed Assets [Member] | Maximum [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Fair value discount rate range - cost to sell (percent)	7.00%	7.00%
Investments in Debt Securities, Available-for-Sale [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Fair value financial assets	$ 175,837	$ 119,307	$ 151,426	$ 90,814	$ 91,400	$ 94,177

Fair Value - Reconciliation of

Fair Value - Reconciliation of Financial Instruments Measured on Recurring Basis and Classified as Level 3 Inputs (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Investment in Debt Securities - Available for sale, beginning balance			$ 137,516
Investment in Debt Securities - Available for sale, ending balance	$ 201,975		201,975
Investments in Debt Securities, Available-for-Sale [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Investment in Debt Securities - Available for sale, beginning balance	151,426	$ 91,400	119,307	$ 94,177
Included in earnings	161	342	539	655
Included in other comprehensive income (loss)	1,488	5,072	9,535	1,982
Purchases	23,069		52,682
Issuances
Settlements	(307)	(6,000)	(6,226)	(6,000)
Investment in Debt Securities - Available for sale, ending balance	$ 175,837	$ 90,814	$ 175,837	$ 90,814

Fair Value - Carrying Amounts,

Fair Value - Carrying Amounts, Estimated Fair Values and Placement in Fair Value Hierarchy of Financial Instruments (Detail) - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments in debt securities, available-for-sale	$ 175,837	$ 119,307
Carrying Amount [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments in debt securities, available-for-sale	175,837	119,307
Loans held-for-sale, net	371,941	144,060
Loans, net	2,995,997	3,239,191
Other assets	20,383	15,954
Credit facilities, net	456,961	445,493
Term debt, net	16,973
Term debt securitizations, net	2,085,733	2,195,064
Senior notes, net	375,287	373,919
Subordinated notes, net	246,929	241,390
Repurchase agreements, net	80,569	55,046
Other liabilities	1,000	1,350
Fair Value [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments in debt securities, available-for-sale	175,837	119,307
Loans held-for-sale, net	376,833	145,406
Loans, net	2,995,619	3,241,910
Other assets	20,383	15,954
Credit facilities, net	456,961	445,493
Term debt, net	16,973
Term debt securitizations, net	2,162,702	2,230,102
Senior notes, net	390,450	380,000
Subordinated notes, net	325,001	303,916
Repurchase agreements, net	80,569	55,046
Other liabilities	1,000	1,350
Fair Value [Member] | Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans held-for-sale, net	196,977	69,875
Loans, net	407,465	403,745
Credit facilities, net	456,961	445,493
Term debt, net	16,973
Term debt securitizations, net	2,162,702	2,230,102
Senior notes, net	390,450	380,000
Repurchase agreements, net	80,569	55,046
Other liabilities	1,000
Fair Value [Member] | Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments in debt securities, available-for-sale	175,837	119,307
Loans held-for-sale, net	179,856	75,531
Loans, net	2,588,154	2,838,165
Other assets	20,383	15,954
Subordinated notes, net	$ 325,001	303,916
Other liabilities		$ 1,350

Segment Reporting - Additional

Segment Reporting - Additional Information (Detail)	9 Months Ended
	Sep. 30, 2017USD ($)Segment
Segment Reporting Information [Line Items]
Number of reportable segments | Segment	2
Minimum [Member] | Commercial Lending Segment [Member]
Segment Reporting Information [Line Items]
Annual cash flow (EBITDA) of companies financed through specialized lending groups	$ 15,000,000
Maximum [Member] | Commercial Lending Segment [Member]
Segment Reporting Information [Line Items]
Annual cash flow (EBITDA) of companies financed through specialized lending groups	$ 50,000,000

Segment Reporting - Summary of

Segment Reporting - Summary of Total Assets and Statement of Operations (Detail) - USD ($) $ in Thousands		3 Months Ended				9 Months Ended
		Sep. 30, 2017		Sep. 30, 2016		Sep. 30, 2017		Sep. 30, 2016		Dec. 31, 2016
Segment Reporting Information [Line Items]
Net interest income:		$ 15,607		$ 25,258		$ 44,603		$ 68,683
Provision for loan losses		1,494		3,570		10,341		24,906
Net interest income after provision		14,113		21,688		34,262		43,777
Noninterest income:
Management fees		3,474		2,888		9,602		9,031
Performance fees		70		465		1,415		1,306
Other lending fees		1,025		2,946		6,379		5,836
Gain on sale of loans and equipment		274		152		1,481		765
Other noninterest income		680	[1]	4,515	[2]	(2,024)	[1]	17,539	[1]
Total noninterest income:		5,523		10,966		16,853		34,477
Non-interest expense		11,900		18,069		33,836		47,977
Income before income taxes		7,736		14,585		17,279		30,277
Income tax expense		3,151		5,941		7,160		12,383
Net income		4,585		8,644		10,119		17,894
Gross loans		3,060,290				3,060,290				$ 3,319,550
Loans held-for-sale, gross		375,560				375,560				145,966
Investments in debt securities, available-for-sale		175,837				175,837				119,307
Other		390,947				390,947				455,769
Total assets		4,002,634				4,002,634				4,040,592
Illiquid Credit funds	[3]	2,018,397				2,018,397				1,314,690
Liquid/Tradeable Credit	[3]	1,541,582				1,541,582				1,833,607
Total Assets		7,562,613				7,562,613				7,188,889
Non Managed assets	[4]	380,973				380,973				449,026
Total Managed Assets		7,181,640				7,181,640				6,739,863
Commercial Lending Segment [Member]
Segment Reporting Information [Line Items]
Net interest income:		14,495		24,135		41,136		65,752
Provision for loan losses		1,494		3,570		10,341		24,906
Net interest income after provision		13,001		20,565		30,795		40,846
Noninterest income:
Other lending fees		988		2,871		6,257		5,729
Gain on sale of loans and equipment		27		83		246		545
Other noninterest income		1,837	[1]	1,059	[2]	5,146	[1]	13,819	[1]
Total noninterest income:		2,852		4,013		11,649		20,093
Non-interest expense		9,371		14,833		27,229		40,027
Income before income taxes		6,482		9,745		15,215		20,912
Gross loans		2,652,825				2,652,825				2,915,805
Loans held-for-sale, gross		375,560				375,560				145,966
Other		314,780				314,780				374,851
Total assets		3,343,165				3,343,165				3,436,622
Total Assets		3,343,165				3,343,165				3,436,622
Non Managed assets	[4]	314,780				314,780				374,851
Total Managed Assets		3,028,385				3,028,385				3,061,771
Asset Management Segment [Member]
Segment Reporting Information [Line Items]
Net interest income:		1,112		1,123		3,467		2,931
Net interest income after provision		1,112		1,123		3,467		2,931
Noninterest income:
Management fees		3,474		2,888		9,602		9,031
Performance fees		70		465		1,415		1,306
Other lending fees		37		75		122		107
Gain on sale of loans and equipment		247		69		1,235		220
Other noninterest income		(1,157)	[1]	3,456	[2]	(7,170)	[1]	3,720	[1]
Total noninterest income:		2,671		6,953		5,204		14,384
Non-interest expense		2,529		3,236		6,607		7,950
Income before income taxes		1,254		$ 4,840		2,064		$ 9,365
Gross loans		407,465				407,465				403,745
Investments in debt securities, available-for-sale		175,837				175,837				119,307
Other		76,167				76,167				80,918
Total assets		659,469				659,469				603,970
Illiquid Credit funds	[3]	2,018,397				2,018,397				1,314,690
Liquid/Tradeable Credit	[3]	1,541,582				1,541,582				1,833,607
Total Assets		4,219,448				4,219,448				3,752,267
Non Managed assets	[4]	66,193				66,193				74,175
Total Managed Assets		$ 4,153,255				$ 4,153,255				$ 3,678,092
[1]	Includes fair value adjustments on Loans held-for-sale and fair value portfolio.
[2]	Includes fair value adjustment on Loans held-for-sale.
[3]	Assets managed by the Company for the Illiquid Credit and Liquid/Tradeable Credit Funds are not assets of the Company and are not included in the Consolidated Total Assets as reflected in the Condensed Consolidated Balance Sheet.
[4]	Other less unamortized discount on investment in debt securities, available-for-sale.

Segment Reporting - Summary o88

Segment Reporting - Summary of Total Assets and Statement of Operations (Parenthetical) (Detail) - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016
Commercial Lending and Asset Management [Member]
Segment Reporting Information [Line Items]
Loans at fair value	$ 407,465	$ 403,745

Related-Party Transactions - Ad

Related-Party Transactions - Additional Information (Detail)	Jul. 20, 2017USD ($)Business	Sep. 30, 2017USD ($)	Sep. 30, 2016USD ($)	Sep. 30, 2017USD ($)	Sep. 30, 2016USD ($)	Jul. 31, 2017USD ($)	Apr. 18, 2017USD ($)	Nov. 29, 2016USD ($)	Jan. 15, 2015USD ($)
Related Party Transaction [Line Items]
Asset management income		$ 3,544,000	$ 3,353,000	$ 11,017,000	$ 10,337,000
Business acquisition date				Jul. 20, 2017
Number of off balance sheet middle market CLOs acquired | Business	2
NewStar Credit Opportunities Fund, Ltd. [Member] | Investment Management Agreement [Member]
Related Party Transaction [Line Items]
Asset management income		10,000	0	$ 10,000	10,000
Arlington Program [Member] | Collateral Management Agreement [Member]
Related Party Transaction [Line Items]
Revenue receivable from transactions with related party		500,000	500,000	1,500,000	1,500,000
NewStar Clarendon Fund CLO LLC [Member] | Collateral Management Agreement [Member]
Related Party Transaction [Line Items]
Revenue receivable from transactions with related party		500,000	$ 500,000	1,500,000	$ 1,500,000
NewStar Clarendon Fund CLO LLC [Member] | Term Debt Securitization [Member]
Related Party Transaction [Line Items]
Balance of fund closed									$ 400,000,000
Related party transaction, investment held, percentage									5.00%
Related party transaction, investment held, amount									$ 20,400,000
NewStar Berkeley Fund CLO LLC [Member] | Collateral Management Agreement [Member]
Related Party Transaction [Line Items]
Revenue receivable from transactions with related party		500,000		1,600,000
NewStar Berkeley Fund CLO LLC [Member] | Term Debt Securitization [Member]
Related Party Transaction [Line Items]
Balance of fund closed								$ 505,000,000
Related party transaction, investment held, percentage								5.00%
Related party transaction, investment held, amount								$ 25,300,000
Longfellow Fund [Member] | Collateral Management Agreement [Member]
Related Party Transaction [Line Items]
Revenue receivable from transactions with related party		400,000		1,100,000
Longfellow Fund [Member] | Term Debt Securitization [Member]
Related Party Transaction [Line Items]
Balance of fund closed							$ 516,900,000
Related party transaction, investment held, percentage							5.00%
Related party transaction, investment held, amount							$ 27,500,000
NewStar Exeter Fund CLO LLC [Member]
Related Party Transaction [Line Items]
Revenue receivable from transactions with related party		200,000		200,000
NewStar Fairfield Fund CLO LTD [Member]
Related Party Transaction [Line Items]
Revenue receivable from transactions with related party		$ 300,000		$ 300,000
Subordinated Notes [Member] | NewStar Exeter Fund CLO LLC [Member] | Class F [Member]
Related Party Transaction [Line Items]
Related party transaction, investment held, percentage	5.00%
Debt instrument face amount	$ 3,900,000					$ 3,900,000
Subordinated Notes [Member] | NewStar Fairfield Fund CLO LTD [Member] | Class F [Member]
Related Party Transaction [Line Items]
Debt instrument face amount	$ 21,500,000					$ 21,500,000

Subsequent Events - Additional

Subsequent Events - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Millions	Nov. 01, 2017	Oct. 20, 2017	Oct. 16, 2017	Jul. 31, 2017	May 02, 2017	Feb. 14, 2017
Subsequent Event [Line Items]
Cash dividend payable, date declared				Jul. 31, 2017	May 2, 2017	Feb. 14, 2017
Cash dividend payable, date to be paid				Sep. 15, 2017	Jun. 15, 2017	Mar. 17, 2017
Cash dividend payable, date of record				Aug. 29, 2017
Subsequent Event [Member]
Subsequent Event [Line Items]
Cash dividend payable, date declared	Nov. 1, 2017
Cash dividend payable per share	$ 0.02
Cash dividend payable, date to be paid	Dec. 15, 2017
Cash dividend payable, date of record	Nov. 29, 2017
Subsequent Event [Member] | 2012-2 CLO [Member]
Subsequent Event [Line Items]
Redemption of notes, cash principal distribution received		$ 22.6
Subsequent Event [Member] | Asset Purchase Agreement [Member] | Middle Market Loans and Other Credit Investments [Member]
Subsequent Event [Line Items]
Portfolio of investment assets held-for-sale			$ 2,400
Subsequent Event [Member] | First Eagle Holdings Inc | Merger Agreement [Member]
Subsequent Event [Line Items]
Expected upfront cash receipt			$ 11.44
Expected number of non-transferable contingent value right			1
Subsequent Event [Member] | First Eagle Holdings Inc | Merger Transaction Closing in 2017 [Member] | Merger Agreement [Member]
Subsequent Event [Line Items]
Estimated tax refunds per share to contingent value right holders			$ 1
Subsequent Event [Member] | First Eagle Holdings Inc | Merger Transaction Closing in 2018 [Member] | Merger Agreement [Member]
Subsequent Event [Line Items]
Estimated tax refunds per share to contingent value right holders			$ 0.88