First Eagle Private Credit (NEWS) 10-Q 7 Aug 17 2017 Q2 Quarterly report Financial data

Document and Entity Information

Document and Entity Information - shares	6 Months Ended
	Jun. 30, 2017	Aug. 02, 2017
Document And Entity Information [Abstract]
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Jun. 30, 2017
Document Fiscal Year Focus	2,017
Document Fiscal Period Focus	Q2
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		41,607,455

Condensed Consolidated Balance

Condensed Consolidated Balance Sheets - USD ($) $ in Thousands	Jun. 30, 2017	Dec. 31, 2016
Assets:
Cash and cash equivalents	$ 49,721	$ 154,480
Restricted cash	223,268	262,643
Cash collateral on deposit with custodians	7,564	7,564
Investments in debt securities, available-for-sale	151,426	119,307
Loans held-for-sale, net	346,626	144,060
Loans, net (including loans at fair value of $403,129 and $403,745, respectively)	3,037,363	3,239,191
Interest receivable	13,536	14,622
Property and equipment, net	239	274
Deferred income taxes, net	36,863	40,807
Income tax receivable	3,764
Goodwill	17,884	17,884
Identified intangible asset, net	405	572
Other assets	42,736	39,188
Total assets	3,931,395	4,040,592
Liabilities:
Credit facilities, net	396,139	445,493
Term debt securitizations, net	2,097,459	2,195,064
Senior notes, net	374,830	373,919
Subordinated notes, net	245,082	241,390
Repurchase agreements, net	79,269	55,046
Accrued interest payable	20,230	21,319
Income tax payable		12,562
Other liabilities	75,144	48,377
Total liabilities	3,288,153	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 41,758,435 in 2017 and 42,820,198 in 2016	418	428
Additional paid-in capital	746,300	743,783
Retained earnings	63,417	59,577
Common stock held in treasury, at cost; 15,879,742 in 2017 and 14,352,904 in 2016	(168,022)	(152,720)
Accumulated other comprehensive income (loss), net	1,129	(3,646)
Total stockholders’ equity	643,242	647,422
Total liabilities and stockholders’ equity	$ 3,931,395	$ 4,040,592

Condensed Consolidated Balance3

Condensed Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands	Jun. 30, 2017	Dec. 31, 2016
Loans at fair value	$ 2,633,032	$ 2,838,165
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	41,758,435	42,820,198
Treasury stock, shares	15,879,742	14,352,904
Commercial Lending and Asset Management [Member]
Loans at fair value	$ 403,129	$ 403,745

Condensed Consolidated Statemen

Condensed Consolidated Statements of Operations - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Net interest income:
Interest income	$ 56,913	$ 59,392	$ 111,995	$ 121,344
Interest expense	41,905	38,486	82,999	77,919
Net interest income	15,008	20,906	28,996	43,425
Provision for credit losses	2,698	3,623	8,847	21,336
Net interest income after provision for credit losses	12,310	17,283	20,149	22,089
Non-interest income:
Asset management income	3,826	3,543	7,473	6,984
Fee income	2,161	1,697	5,354	2,890
Realized loss on derivatives, net		(11)		(18)
Realized gain on sale of loans, net	511	162	1,207	55
Other miscellaneous income, net	1,848	741	3,346	2,696
Mark to market adjustment on fair value loans	(3,181)	373	(5,950)	268
Loss on total return swap				(6,062)
Unrealized gain (loss) on loans held-for-sale, net	14	(2,146)	(100)	(5,813)
Gain on sale of Business Credit, net				22,511
Total non-interest income	5,179	4,359	11,330	23,511
Operating expenses:
Compensation and benefits	6,747	8,827	14,184	19,465
General and administrative expenses	3,552	4,013	7,752	10,443
Total operating expenses	10,299	12,840	21,936	29,908
Income before income taxes	7,190	8,802	9,543	15,692
Income tax expense	3,038	3,561	4,009	6,442
Net income	$ 4,152	$ 5,241	$ 5,534	$ 9,250
Basic Earnings per share	$ 0.10	$ 0.11	$ 0.13	$ 0.20
Diluted Earnings per share	0.10	$ 0.11	0.13	$ 0.20
Dividends declared per common share	$ 0.02		$ 0.04

Condensed Consolidated Stateme5

Condensed Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Statement Of Income And Comprehensive Income [Abstract]
Net income	$ 4,152	$ 5,241	$ 5,534	$ 9,250
Other comprehensive income (loss), net of tax:
Net unrealized securities gains (losses), net of tax expense (benefit) of $1,420, $644, $3,266 and $(1,255), respectively	2,078	932	4,775	(1,835)
Net unrealized derivative gains (losses), net of tax expense (benefit) of $0, $1, $0 and $(7), respectively		1		(11)
Other comprehensive income (loss)	2,078	933	4,775	(1,846)
Comprehensive income	$ 6,230	$ 6,174	$ 10,309	$ 7,404

Condensed Consolidated Stateme6

Condensed Consolidated Statements of Comprehensive Income (Parenthetical) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Statement Of Income And Comprehensive Income [Abstract]
Tax expense (benefit) on unrealized securities gains (losses)	$ 1,420	$ 644	$ 3,266	$ (1,255)
Tax expense (benefit) on unrealized derivative gains (losses)	$ 0	$ 1	$ 0	$ (7)

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	9,250			9,250
Other comprehensive income (loss)	(1,846)					(1,846)
Issuance of restricted stock		6	(6)
Net Shares reacquired from employee transactions	(414)	(1)	1		(414)
Tax benefit (expense) from vesting of restricted stock	(474)		(474)
Repurchase of common stock	(8,668)	(12)	12		(8,668)
Exercise of common stock options, net	(1,759)	8	(1,767)
Tax benefit from exercise of stock options	1,293		1,293
Amortization of restricted common stock awards	1,863		1,863
Ending Balance at Jun. 30, 2016	658,723	466	743,892	40,603	(118,327)	(7,911)
Beginning Balance at Dec. 31, 2016	647,422	428	743,783	59,577	(152,720)	(3,646)
Net income	5,534			5,534
Other comprehensive income (loss)	4,775					4,775
Common stock dividends of $0.04 per share	(1,694)			(1,694)
Issuance of restricted stock		4	(4)
Net Shares reacquired from employee transactions	(822)	(1)	1		(822)
Repurchase of common stock	(14,480)	(14)	14		(14,480)
Exercise of common stock options, net	778	1	777
Amortization of restricted common stock awards	1,729		1,729
Ending Balance at Jun. 30, 2017	$ 643,242	$ 418	$ 746,300	$ 63,417	$ (168,022)	$ 1,129

Condensed Consolidated Stateme8

Condensed Consolidated Statements of Changes in Stockholders' Equity (Parenthetical) - $ / shares	3 Months Ended	6 Months Ended
	Jun. 30, 2017	Jun. 30, 2017
Statement Of Stockholders Equity [Abstract]
Common stock, dividends, per share	$ 0.02	$ 0.04

Condensed Consolidated Stateme9

Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016
Cash flows from operating activities:
Net income	$ 5,534	$ 9,250
Adjustments to reconcile net income to net cash used for operations:
Provision for credit losses	8,847	21,336
Depreciation, amortization and accretion, net	(7,384)	(4,975)
Amortization of debt issuance costs	8,637	8,910
Equity compensation expense	1,729	1,863
Gain on sale of Business Credit, net		(22,511)
Gain on sale of loans, net	(1,207)	(55)
Loss on total return swap		6,062
Gain on sale of equipment, net		(553)
Loss on sale of CLO bonds	(18)
Net change in deferred income taxes	680	3,974
Loans held-for-sale originated	(569,409)	(143,246)
Proceeds from sale of loans held-for-sale	380,283	233,109
Unrealized loss on loans held-for-sale, net	100	5,813
Net change in interest receivable	1,086	(2,570)
Net change in other assets	2,207	(4,586)
Net change in accrued interest payable	(1,089)	1,591
Net change in other liabilities	(50,317)	(16,028)
Net cash (used in) provided by operating activities	(220,321)	97,384
Cash flows from investing activities:
Net change in restricted cash	39,375	(53,402)
Net change in loans and leases	245,394	7,369
Purchase of equity investments	(2,499)	(3,706)
Purchase of debt securities, available-for-sale	(29,613)
Proceeds from debt securities, available-for-sale	5,919
Purchase of property and equipment	(20)	(8)
Net cash provided by (used in) investing activities	258,556	(49,747)
Cash flows from financing activities:
Inputs from exercise of stock options, net	778	(1,767)
Tax benefit from exercise of stock options		1,293
Tax expense from vesting of restricted stock		(474)
Payment of dividends on common stock	(1,694)
Advances on credit facilities	260,300	1,112,409
Repayment of borrowings on credit facilities	(310,900)	(1,379,952)
Issuance of term debt	303,000	255,750
Borrowings on term debt		27,600
Repayment of borrowings on term debt	(402,076)	(95,089)
Borrowing on subordinated notes		24,500
Borrowings on repurchase agreements	25,764	2,881
Repayment of borrowings on repurchase agreements	(1,541)	(34,681)
Release of cash collateral		53,517
Payment of deferred financing costs	(1,323)	(5,841)
Purchase of treasury stock	(15,302)	(9,082)
Net cash used in financing activities	(142,994)	(48,936)
Net decrease in cash during the period	(104,759)	(1,299)
Cash and cash equivalents at beginning of period	154,480	35,933
Cash and cash equivalents at end of period	49,721	34,634
Supplemental cash flows information:
Interest paid	84,088	76,328
Taxes paid, net of refund	19,663	4,652
Transfer of loans, net to loans-held-for-sale, at fair value	13,540	56,989
Unsettled trades payable	$ 57,495	$ 32,859

Organization

Organization	6 Months Ended
	Jun. 30, 2017
Accounting Policies [Abstract]
Organization	Note 1. Organization NewStar Financial, Inc. is an internally-managed, commercial finance company with $6.5 billion of assets managed across two complementary business lines- middle market direct lending and asset management. 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. Through its asset management platforms, NewStar offers a range of investment products employing credit-oriented strategies focused on middle market loans and liquid, tradeable credit. The Company manages approximately $1.3 billion of assets in a series of private credit funds that co-invest in middle market loans originated through its established leveraged finance lending platform and its strategic relationship with GSO Capital, the credit division of The Blackstone Group. Through its wholly-owned subsidiary, NewStar Capital, the Company also has more than $2 billion of assets managed across a series of CLOs that invest primarily in broadly syndicated, non-investment grade loans, as well as other sponsored funds and managed accounts that invest across various asset classes, including non-investment grade loans and bonds. 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 selectively arranges larger transactions that it may retain on its balance sheet or syndicate to other lenders, which may include funds that it manages for third party institutional investors. By syndicating loans to other lenders and the Company's managed funds, it is able to provide larger financing commitments to its customers and generate fee income, while limiting its risk exposure to single borrowers. The Company’s operations were divided into two reportable segments that represent its core businesses, Commercial Lending and Asset Management. 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 Asset Management segment represents our investment advisory activities which are focused on providing opportunities for qualified investors to invest in a range of credit funds managed by the Company. The Asset Management segment manages a series of private credit funds that co-invest in middle market loans originated through its established direct lending platform. Additionally, through its wholly-owned 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	6 Months Ended
	Jun. 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 (collectively, “NewStar”) and have been prepared in accordance with U.S. generally accepted accounting principles (“GAAP”). All significant intercompany transactions have been eliminated in consolidation. These interim condensed financial statements include adjustments of a normal and recurring nature considered necessary by management to fairly present NewStar’s financial position, results of operations and cash flows. These interim condensed financial statements may not be indicative of financial results for the full year. The preparation of financial statements in conformity with GAAP requires management to make estimates and assumptions that affect certain reported amounts and disclosure of contingent assets and liabilities. Actual results could differ from those estimates. The estimates most susceptible to change in the near-term are the Company’s estimates of its (i) allowance for credit losses, (ii) recorded amounts of deferred income taxes, (iii) fair value measurements used to record fair value adjustments to certain financial instruments, (iv) valuation of investments, (v) determination of other than temporary impairments and temporary impairments and (vi) impairment of goodwill and identified intangible assets. The interim condensed consolidated financial statements and notes thereto should be read in conjunction with the Company’s Annual Report on Form 10-K for the year ended December 31, 2016. Prior Period Reclassification Prior period amounts are reclassified wherever necessary to confirm with current period presentation. Segment Reporting Due to the continued expansion of our asset management activities, through new fund formation and the acquisition of NewStar Capital, the Company reassessed its classification of reporting as a single segment under ASC 280, Segment Reporting 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 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 2017-01, Business Combinations (Topic 805): Clarifying the Definition of a Business. ASU 2017-01 is 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.

Disposition Activities

Disposition Activities	6 Months Ended
	Jun. 30, 2017
Discontinued Operations And Disposal Groups [Abstract]
Disposition Activities	Note 3. Disposition Activities 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 June 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 June 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	6 Months Ended
	Jun. 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 June 30, 2017 and December 31, 2016, loans held-for-sale consisted of the following: June 30, 2017 December 31, 2016 ($ in thousands) Leveraged Finance $ 350,016 $ 146,126 Lower cost or market adjustment (259 ) (160 ) Gross loans held-for-sale 349,757 145,966 Deferred loan fees, net (3,131 ) (1,906 ) Loans held-for-sale, net $ 346,626 $ 144,060 These loans are carried at the lower of aggregate cost, net of any deferred origination costs or fees, or fair value. At June 30, 2017, loans held-for-sale consisted of loans with an aggregate outstanding balance of $350.0 million that were intended to be sold to credit funds managed by the Company. The Company sold loans with an outstanding balance totaling $34.7 million to entities other than credit funds managed by the Company for an aggregate gain of $0.1 million during the six months ended June 30, 2017. The Company sold loans with an outstanding balance of $129.4 million for a net loss of $0.09 million to entities other than credit funds managed by the Company during the six months ended June 30, 2016. As of June 30, 2017, and December 31, 2016, loans consisted of the following: June 30, 2017 December 31, 2016 ($ in thousands) Leveraged Finance (1) $ 3,099,400 $ 3,308,926 Real Estate 10,673 10,624 Gross loans 3,110,073 3,319,550 Deferred loan fees and discount, net (25,898 ) (29,423 ) Allowance for loan losses (46,812 ) (50,936 ) Total loans, net $ 3,037,363 $ 3,239,191 (1) Includes loans at fair value of $ 403.1 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 June 30, 2017, $101.8 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 June 30, 2017, the Company had investments, net of charge-offs in impaired loans with a balance of $121.8 million. Impaired loans with an aggregate outstanding balance of $94.9 million have been restructured and classified as TDRs. At June 30, 2017, additional funding commitments for TDRs totaled $5.4 million. As of June 30, 2017, 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 $95.1 million were also on non-accrual status. These non-accrual loans had a carrying value of $88.7 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 six months ended June 30, 2017, the Company charged off $7.5 million and $13.0 million, respectively of non-accruing loan balances. During the three months ended June 30, 2017, the Company placed no new loans on non-accrual status. During the six months ended June 30, 2017, the Company placed loans with an aggregate outstanding balance of $8.5 million on non-accrual status. During the three and six months ended June 30, 2017, the Company recorded $3.3 million and $9.6 million, respectively, of net specific provisions for impaired loans. At June 30, 2017, the Company had a $16.4 million specific allowance for impaired loans with an aggregate outstanding balance of $79.1 million. At June 30, 2017, additional funding commitments for impaired loans totaled $8.3 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, or if the borrower is not in compliance additional funding commitments may be made at the Company’s discretion. As of June 30, 2017, the Company had loans totaling $14.1 million on non-accrual status which were greater than 60 days past due and classified as delinquent by the Company. Included in the $16.4 million specific allowance for impaired loans was $1.8 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) June 30, 2017 Impaired loans $ 121,822 $ 115,207 $ 151,190 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) June 30, 2017 Impaired loans $ 79,116 $ 74,497 $ 42,706 $ 40,710 December 31, 2016 Impaired loans $ 73,499 $ 68,924 $ 59,914 $ 57,915 During the three and six months ended June 30, 2017, the Company recorded net partial charge-offs of $7.5 million and $13.0 million, respectively. During the three and six months ended June 30, 2016, the Company recorded net charge-offs of $6.9 million and $14.2 million, respectively. When a loan is determined to be uncollectible, the specific allowance is charged off, which reduces the gross investment in the loan. The Company may record the initial specific allowance related to an impaired loan in the same period as it records a partial charge-off in certain circumstances such as if the terms of a restructured loan are finalized during that period. While charge-offs typically have no net impact on the carrying value of net loans, charge-offs lower the level of the allowance for loan losses, and, as a result, reduce the percentage of allowance for loans to total loans, and the percentage of allowance for loan losses to non-performing loans. Below is a summary of the Company’s evaluation of its amortized cost portfolio and allowance for loan losses by impairment methodology: Leveraged Finance Real Estate June 30, 2017 Investment Allowance Investment Allowance ($ in thousands) Collectively evaluated (1)(2) $ 2,574,449 $ 30,357 $ 10,673 $ 92 Individually evaluated (3) 121,822 16,363 — — Total $ 2,696,271 $ 46,720 $ 10,673 $ 92 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 June 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 $403.1 million at June 30, 2017 and $403.7 million at December 31, 2016 of Leveraged Finance loans which the Company elected to record at fair value. (3) Represents loans individually evaluated for impairment in accordance with ASU 310-10, Receivables, Below is a summary of the Company’s investment in nonaccrual loans. Recorded Investment in Nonaccrual Loans June 30, 2017 December ($ in thousands) Nonaccrual loans $ 95,102 $ 99,233 Less: Deferred loan fees (6,615 ) (6,485 ) Add back: Interest receivable 182 116 Total $ 88,669 $ 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 June 30, 2017 and December 31, 2016 is provided below: Group I Group II ($ in thousands) June 30, 2017 $ 94,881 $ 62,057 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 six months ended June 30, 2017, the Company recorded $7.5 million and $13.0 million, respectively, of partial charge-offs related to loans previously classified as TDR. As of June 30, 2017, the Company had not removed the TDR classification from any loan previously identified as such during the quarter, but had charged-off, sold and received repayments of outstanding TDRs. The Company measures TDRs similarly to how it measures all loans for impairment. The Company performs a discounted cash flow analysis on cash flow dependent loans and assesses the underlying collateral value less reasonable costs of sale for collateral dependent loans. Management analyzes the projected performance of the borrower to determine if it has the ability to service principal and interest payments based on the terms of the restructuring. Loans will typically not be returned to accrual status until at least six months of contractual payments have been made in a timely manner or the borrower shows significant ability to maintain servicing of the restructured debt. Additionally, at the time of a restructuring and quarterly thereafter, an impairment analysis is undertaken to determine the measurement of specific reserve, if any, on each impaired loan. Below is a summary of the Company’s loans which were newly classified as TDR and existing TDR loans which subsequently defaulted, in each during the periods presented. As of the Three Months Ended June 30, 2017 Pre-Modification Outstanding Recorded Investment Post-Modification Outstanding Recorded Investment Investment in TDR Subsequently Defaulted ($ in thousands) Leveraged Finance $ — $ — $ 14,615 Total $ — $ — $ 14,615 As of the Six Months Ended June 30, 2017 Pre-Modification Outstanding Recorded Investment Post-Modification Outstanding Recorded Investment Investment in TDR Subsequently Defaulted ($ in thousands) Leveraged Finance $ — $ — $ 29,971 Total $ — $ — $ 29,971 As of the Three and Six Months Ended June 30, 2016 Pre-Modification Outstanding Recorded Investment Post-Modification Outstanding Recorded Investment Investment in TDR Subsequently Defaulted ($ in thousands) Leveraged Finance $ 1,775 $ 1,308 $ — Real Estate — — 4,483 Total $ 1,775 $ 1,308 $ 4,483 The following sets forth a breakdown of troubled debt restructurings at June 30, 2017 and December 31, 2016: As of June 30, 2017 Accrual Status For the six months ($ in thousands) Loan Type Accruing Nonaccrual Impaired Balance Specific Allowance Charged-off Leveraged Finance $ 16,087 $ 78,801 $ 94,888 $ 10,791 $ 7,494 Total $ 16,087 $ 78,801 $ 94,888 $ 10,791 $ 7,494 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) June 30, 2017 Leveraged Finance $ — $ 14,110 $ 14,110 $ 3,085,290 $ 3,099,400 $ — Real Estate — — — 10,673 10,673 — Total $ — $ 14,110 $ 14,110 $ 3,095,963 $ 3,110,073 $ — 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 June 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 June 30, 2017 Leveraged Finance Real Estate Total ($ in thousands) Balance, beginning of period $ 51,989 $ 92 $ 52,081 Provision (reversal) for credit losses—general (600 ) — (600 ) Provision for credit losses—specific 3,297 — 3,297 Loans charged off, net of recoveries (7,494 ) — (7,494 ) Balance, end of period $ 47,192 $ 92 $ 47,284 Balance, end of period—specific $ 16,363 $ — $ 16,363 Balance, end of period—general $ 30,829 $ 92 $ 30,921 Average balance of impaired loans $ 129,780 $ — $ 129,780 Interest recognized from impaired loans $ 267 $ — $ 267 Loans (1) Loans individually evaluated with specific allowance $ 79,116 $ — $ 79,116 Loans individually evaluated with no specific allowance 42,706 — 42,706 Loans collectively evaluated with general allowance 2,574,449 10,673 2,585,122 Total loans $ 2,696,271 $ 10,673 $ 2,706,944 (1) Excludes $403.1 million of Leveraged Finance loans which the Company elected to record at fair value. Six Months Ended June 30, 2017 Leveraged Finance Real Estate Total ($ in thousands) Balance, beginning of period $ 51,316 $ 92 $ 51,408 Provision for credit losses—general (715 ) — (715 ) Provision for credit losses—specific 9,561 — 9,561 Loans charged off, net of recoveries (12,970 ) — (12,970 ) Balance, end of period $ 47,192 $ 92 $ 47,284 Balance, end of period—specific $ 16,363 $ — $ 16,363 Balance, end of period—general $ 30,829 $ 92 $ 30,921 Average balance of impaired loans $ 210,441 $ — $ 210,441 Interest recognized from impaired loans $ 1,915 $ — $ 1,915 Three Months Ended June 30, 2016 Leveraged Finance Real Estate Equipment Finance Total ($ in thousands) Balance, beginning of period $ 61,528 $ 4,422 $ 1,342 $ 67,292 Provision for credit losses—general 1,198 44 (35 ) 1,207 Provision for credit losses—specific 2,308 108 — 2,416 Loans charged off, net of recoveries (2,389 ) (4,483 ) — (6,872 ) Balance, end of period $ 62,645 $ 91 $ 1,307 $ 64,043 Balance, end of period—specific $ 32,880 $ — $ — $ 32,880 Balance, end of period—general $ 29,765 $ 91 $ 1,307 $ 31,163 Average balance of impaired loans $ 177,654 $ 34,209 $ — $ 211,863 Average net book value of impaired leases $ — $ — $ 660 $ 660 Interest recognized from impaired loans $ 3,083 $ 785 $ 12 $ 3,880 Loans (1) Loans individually evaluated with specific allowance $ 117,501 $ — $ — $ 117,501 Loans individually evaluated with no specific allowance 39,981 7,188 623 47,792 Loans collectively evaluated with general allowance 2,720,144 10,553 164,611 2,895,308 Total loans $ 2,877,626 $ 17,741 $ 165,234 $ 3,060,601 (1) Excludes $167.2 million of Leveraged Finance loans which the Company elected to record at fair value. Six Months Ended June 30, 2016 Leveraged Finance Business Credit Real Estate Equipment Finance Total ($ in thousands) Balance, beginning of period $ 54,788 $ 1,991 $ 656 $ 1,291 $ 58,726 Provision for credit losses—general 1,425 (172 ) 1,009 16 2,278 Provision for credit losses—specific 14,881 — 4,177 — 19,058 Reversal due to sale of Business Credit — (1,819 ) 0 — (1,819 ) Loans charged off, net of recoveries (8,449 ) — (5,751 ) — (14,200 ) Balance, end of period $ 62,645 $ — $ 91 $ 1,307 $ 64,043 Balance, end of period—specific $ 32,880 $ — $ — $ — $ 32,880 Balance, end of period—general $ 29,765 $ — $ 91 $ 1,307 $ 31,163 Average balance of impaired loans $ 177,181 $ — $ 34,540 $ — $ 211,721 Average net book value of impaired leases $ — $ — $ — $ 723 $ 723 Interest recognized from impaired loans $ 4,979 $ — $ 832 $ 12 $ 5,823 Included in the allowance for credit losses at June 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 six months ended June 30, 2017, the Company recorded a total provision for credit losses of $8.8 million. The Company decreased its allowance for credit losses to $47.3 million as of June 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 4 % as of June 30, 2017 and December 31, 2016.

Restricted Cash

Restricted Cash	6 Months Ended
	Jun. 30, 2017
Cash And Cash Equivalents [Abstract]
Restricted Cash	Note 5. Restricted Cash Restricted cash as of June 30, 2017 and December 31, 2016 was as follows: June 30, 2017 December 31, 2016 ($ in thousands) Collections on loans pledged to credit facilities $ 37,731 $ 43,822 Principal and interest collections on loans held in trust and prefunding amounts 185,403 216,501 Customer escrow accounts 134 2,320 Total $ 223,268 $ 262,643 As of June 30, 2017, the Company had the ability to use $155.1 million of restricted cash to fund new or existing loans.

Investments in Debt Securities,

Investments in Debt Securities, Available-for-Sale	6 Months Ended
	Jun. 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 June 30, 2017 and December 31, 2016 was as follows: June 30, 2017 December 31, 2016 ($ in thousands) Investments in debt securities—gross $ 157,326 $ 132,180 Unamortized discount (7,822 ) (6,743 ) Investments in debt securities—amortized cost $ 149,504 $ 125,437 At June 30, 2017 and December 31, 2016 investments in non-NewStar managed issuers totaled $74.0 million and $75.8 million, respectively. The amortized cost, gross unrealized holding gains, gross unrealized holding losses, and fair value of available-for-sale securities at June 30, 2017 and December 31, 2016 were as follows: Amortized cost Gross unrealized holding gains Gross unrealized holding losses Fair value ($ in thousands) June 30, 2017 Collateralized loan obligations $ 149,504 $ 2,923 $ (1,001 ) $ 151,426 $ 149,504 $ 2,923 $ (1,001 ) $ 151,426 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 $ 125,437 $ 286 $ (6,416 ) $ 119,307 During the three and six months ended June 30, 2017, the Company purchased $26.1 million and $29.6 million of debt securities, redeemed a $5.9 million par value investment in debt securities, and made a $0.2 million par paydown. During the six months ended June 30, 2016, the Company did not purchase, sell, or redeem any debt securities available for sale. The Company did not record any net “Other-Than-Temporary Impairment” charges during the three and six months ended June 30, 2017 and 2016. The following is an analysis of the continuous periods during which the Company has held investment positions which were carried at an unrealized loss as of June 30, 2017 and December 31, 2016: June 30, 2017 Less than 12 Months Greater than or Equal to 12 Months Total ($ in thousands) Number of positions 4 4 8 Fair value $ 9,429 $ 16,340 $ 25,769 Amortized cost 9,683 17,087 26,770 Unrealized loss $ (254 ) $ (747 ) $ (1,001 ) 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 June 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 June 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 June 30, 2017 and December 31, 2016: June 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 85,866 87,344 53,177 48,404 Due after ten years through fifteen years 63,638 64,082 72,169 70,883 Total $ 149,504 $ 151,426 $ 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	6 Months Ended
	Jun. 30, 2017
Debt Disclosure [Abstract]
Borrowings	Note 7. Borrowings Credit Facilities As of June 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 June 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 $373.7 million and unamortized deferred financing fees of $5.5 million as of June 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 $30.0 million outstanding balance and unamortized deferred financing fees of $2.1 million as of June 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 June 30, 2017, unamortized deferred financing fees were $4.6 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 $50.3 million as of June 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 June 30, 2017, unamortized deferred financing fees were $4.7 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 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 June 30, 2017, the $155.3 million of outstanding drawn notes were collateralized by the specific loans and investments, principal collection account cash and principal payment receivables totaling $201.5 million. At June 30, 2017, unamortized deferred financing fees were $0.3 million. The 2012-2 CLO permitted reinvestment of collateral principal repayments for a three-year period which ended in January 2016. The Company receives a loan collateral management fee and excess interest spread. The Company also receives payments with respect to the classes of notes it owns in accordance with the transaction documents. The Company expects to receive a principal distribution as owner of the membership interests when the term debt is retired. If loan collateral in the 2012-2 CLO is in default under the terms of the indenture, the excess interest spread from the 2012-2 CLO may not be distributed if the overcollateralization ratio, or other collateral quality tests, are not satisfied. The following table sets forth selected information with respect to the 2012-2 CLO: Notes originally issued Outstanding balance June 30, 2017 Interest rate Legal final maturity ($ in thousands) 2012-2 CLO Class A $ 190,700 $ 66,364 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 $ 155,264 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 June 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 June 30, 2017, unamortized deferred financing fees were $1.7 million. The 2014-1 CLO permits reinvestment of collateral principal repayments for a four-year period ending in April 2018. Should the Company determine that reinvestment of collateral principal repayments are impractical in light of market conditions or if collateral principal repayments are not reinvested within a prescribed timeframe, such funds may be used to repay the outstanding notes. The Company receives a loan collateral management fee and excess interest spread. The Company also receives payments with respect to the classes of notes it owns in accordance with the transaction documents. The Company expects to receive a principal distribution as owner of the membership interests when the term debt is retired. If loan collateral in the 2014-1 CLO is in default under the terms of the indenture, the excess interest spread from the 2014-1 CLO may not be distributed if the overcollateralization ratio, or other collateral quality tests, are not satisfied. The following table sets forth selected information with respect to the 2014-1 CLO: Notes originally issued Outstanding balance June 30, 2017 Interest rate Legal final maturity ($ 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 June 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 June 30, 2017, unamortized deferred financing fees were $2.8 million. The 2015-1 CLO permits reinvestment of collateral principal repayments for a four-year period ending in April 2019. Should the Company determine that reinvestment of collateral principal repayments are impractical in light of market conditions or if collateral principal repayments are not reinvested within a prescribed timeframe, such funds may be used to repay the outstanding notes. The Company receives a loan collateral management fee and excess interest spread. The Company also receives payments with respect to the classes of notes it owns in accordance with the transaction documents. The Company expects to receive a principal distribution as owner of the membership interests when the term debt is retired. If loan collateral in the 2015-1 CLO is in default under the terms of the indenture, the excess interest spread from the 2015-1 CLO may not be distributed if the overcollateralization ratio, or other collateral quality tests, are not satisfied. The following table sets forth selected information with respect to the 2015-1 CLO: Notes originally issued Outstanding balance June 30, 2017 Interest rate Legal final maturity ($ 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 June 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 June 30, 2017, unamortized deferred financing fees were $2.6 million. The 2015-2 CLO permits reinvestment of collateral principal repayments for a four-year period ending in August 2019. Should the Company determine that reinvestment of collateral principal repayments are impractical in light of market conditions or if collateral principal repayments are not reinvested within a prescribed timeframe, such funds may be used to repay the outstanding notes. The Company receives a loan collateral management fee and excess interest spread. The Company also receives payments with respect to the classes of notes it owns in accordance with the transaction documents. The Company expects to receive a principal distribution as owner of the membership interests when the term debt is retired. If loan collateral in the 2015-2 CLO is in default under the terms of the indenture, the excess interest spread from the 2015-2 CLO may not be distributed if the overcollateralization ratio, or other collateral quality tests, are not satisfied. The following table sets forth selected information with respect to the 2015-2 CLO: Notes originally issued Outstanding balance June 30, 2017 Interest rate Legal final maturity ($ 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 June 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 June 30, 2017, unamortized deferred financing fees were $2.2 million. The 2016-1 CLO permits reinvestment of collateral principal repayments for a four-year period ending in February 2020. Should the Company determine that reinvestment of collateral principal repayments are impractical in light of market conditions or if collateral principal repayments are not reinvested within a prescribed timeframe, such funds may be used to repay the outstanding notes. The following table sets forth selected information with respect to the 2016-1 CLO: Notes originally issued Outstanding balance June 30, 2017 Interest rate Legal final maturity ($ 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 June 30, 2017, the outstanding note balance was $367.8 million and unamortized deferred financing fees were $3.8 million. The reinvestment period is expected to end in October 2020 and scheduled to mature in October 2028. The Company receives a loan collateral management fee and excess interest spread. The Company also receives payments with respect to the classes of notes it owns in accordance with the transaction documents. The Company expects to receive a principal distribution as owner of the membership interests when the term debt is retired. If loan collateral in the Arch Street CLO is in default under the terms of the indenture, the excess interest spread from the Arch Street CLO may not be distributed if the overcollateralization ratio, or other collateral quality tests, are not satisfied. The following table sets forth selected information with respect to the Arch Street CLO: Notes originally issued Outstanding balance June 30, 2017 Interest rate Legal final maturity ($ 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 June 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 June 30, 2017, unamortized deferred financing fees were $3.2 million. The reinvestment period is expected to end in March 2019 and the replacement notes are scheduled to mature in October 2027. The Company receives a loan collateral management fee and excess interest spread. The Company also receives payments with respect to the classes of notes it owns in accordance with the transaction documents. The Company expects to receive a principal distribution as owner of the membership interests when the term debt is retired. If loan collateral in the 2017-1 CLO is in default under the terms of the indenture, the excess interest spread from the 2017-1 CLO may not be distributed if the overcollateralization ratio, or other collateral quality tests, are not satisfied. The following table sets forth selected information with respect to the 2017-1 CLO: Notes originally issued Outstanding balance June 30, 2017 Interest rate Legal final maturity ($ 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	6 Months Ended
	Jun. 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 June 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 (2000 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 June 30, 2017, the outstanding balance was $49.1 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 JP Morgan Chase Bank pursuant to the terms of a Global Master Repurchase Agreement (2000 version), dated as of April 2, 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 June 30, 2017, the outstanding balance was $28.3 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 June 30, 2017, the outstanding balance was $1.8 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	6 Months Ended
	Jun. 30, 2017
Equity [Abstract]
Stockholders' Equity	Note 9. Stockholders’ Equity Stockholders’ Equity As of June 30, 2017 and December 31, 2016, the Company’s authorized capital consists of preferred and common stock and the following was authorized and outstanding: June 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 41,758 145,000 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 initiated a quarterly cash dividend which was paid on March 17, 2017. On May 2, 2017, the Board of Directors authorized a quarterly cash dividend of $0.02 per share which was paid on June 15, 2017 to stockholders of record on May 30, 2017. Warrants On January 23, 2015, the Company completed its December 4, 2014 issuance of warrants as part of the strategic relationship with Franklin Square Capital Partners (“Franklin Square”). The Company issued the second tranche of warrants to purchase 2,500,000 shares of its common stock subject to the same terms as the warrants that were issued on December 4, 2014, bringing the total warrants to purchase shares of common stock to 12,000,000. The terms of the warrants contain standard adjustments to the exercise price and warrant shares to adjust for the effect of certain distributions, including cash dividends. No adjustments are required until cumulative adjustments would result in a one percent change to the exercise price or number of warrant shares. To date, the cash dividends declared and paid by the Company have not resulted in any adjustment to the warrants’ exercise price or the number of shares underlying the warrants, because such distributions have not exceeded the minimum adjustment amounts. Restricted Stock During the six months ended June 30, 2017, the Company issued 284,241 shares of restricted stock to certain employees of the Company pursuant to the Company’s 2006 Incentive Plan, as amended and 56,698 shares of restricted stock to certain members of its Board of Directors. The fair value of the shares of restricted stock is equal to the closing price of the Company’s stock on the date of issuance. The shares of restricted stock issued to employees of the Company vest in three equal installments on each of the first three anniversaries of the date of grant. Restricted stock activity for the six months ended June 30, 2017 was as follows: Shares Grant-date fair value ($ in thousands) Non-vested as of December 31, 2016 840,834 $ 6,564 Granted 340,939 3,350 Vested (382,641 ) (3,184 ) Forfeited (2,543 ) (25 ) Non-vested as of June 30, 2017 796,589 $ 6,705 The Company’s compensation expense related to restricted stock was $0.9 million and $1.7 million, respectively, for three and six months ended June 30, 2017 and $0.9 million and $1.9 million, respectively, for the three and six months ended June 30, 2016. The unrecognized compensation cost of $3.9 million at June 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 six months ended June 30, 2017 was as follows: Options Outstanding as of December 31, 2016 421,692 Granted — Exercised (251,692 ) Forfeited (10,000 ) Outstanding as of June 30, 2017 160,000 Vested and exercisable as of June 30, 2017 160,000 As of June 30, 2017 and December 31, 2016, the Company has recognized all compensation costs related to options granted.

Earnings Per Share

Earnings Per Share	6 Months Ended
	Jun. 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 six months ended June 30, 2017 and 2016 are as follows: Three Months Ended June 30, Six Months Ended June 30, 2017 2016 2017 2016 (In thousands) Numerator: Net income to common shareholders $ 4,152 $ 5,241 $ 5,534 $ 9,250 Net income allocated to participating securities - basic and diluted 79 94 104 151 Net income allocated to common shareholders - basic and diluted 4,073 5,147 5,430 9,099 Denominator: Denominator for basic earnings per common share 41,225 46,011 41,512 46,157 Denominator for diluted earnings per common share: Denominator for basic earnings per common share 41,225 46,011 41,512 46,157 Potentially dilutive securities - options 25 — 29 - Total weighted average diluted shares 41,250 46,011 41,541 46,157 Earnings per common share Basic $ 0.10 $ 0.11 $ 0.13 $ 0.20 Diluted $ 0.10 $ 0.11 $ 0.13 $ 0.20 Warrants to purchase 12,000,000 shares of common stock were not included in the computation of earnings per share for the three and six months ended June 30, 2017 and 2016 due to the fact that the effect would be anti-dilutive. Stock options representing 806,519 shares were not included in the computation of earnings per share for the six months ended June 30, 2016 due to the fact that the effect would be anti-dilutive.

Variable Interest Entities

Variable Interest Entities	6 Months Ended
	Jun. 30, 2017
Organization Consolidation And Presentation Of Financial Statements [Abstract]
Variable Interest Entities	Note 11. Variable Interest Entities On October 1, 2015, the Company adopted ASU 2015-2, Consolidation – Amendments to the Consolidation Analysis 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. Consolidated VIEs are disclosed in Note 7. Unconsolidated VIEs 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 European Union (“EU”) risk retention rules, the Company holds 5% of each class of notes in the securitization (vertical strip), totaling $25.3 million. The Berkeley Fund employs an independent investment professional who is responsible for investment decision making on behalf of the fund. 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 Clarendon Fund employs an independent investment professional who is responsible for reviewing and approving investment recommendations made to the Clarendon Fund by the Company. 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. 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 risk retention rules, the Company holds 5% of each class of notes in the securitization (vertical strip), totaling $27.5 million. The Company has determined that it is not the primary beneficiary of the Longfellow Fund and will not consolidate the Longfellow Fund’s operating results or statements of financial position; however, the Company has determined that it has a variable interest in the Longfellow Fund as it holds notes of the securitization. The following table sets forth the information with respect to the unconsolidated VIEs for which the Company holds a variable interest in as of June 30, 2017 and December 31, 2016: June 30, 2017 December 31, 2016 ($ in thousands) Unconsolidated VIE assets $ 1,423,263 $ 912,900 Unconsolidated VIE liabilities 831,527 810,030 Equity interest included on the Consolidated Balance Sheet 54,381 50,386 Maximum risk of loss (1) 55,223 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	6 Months Ended
	Jun. 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: June 30, 2017 December 31, 2016 ($ in thousands) Unused lines of credit $ 306,113 $ 326,051 Standby letters of credit 6,825 8,239

Total Return Swap

Total Return Swap	6 Months Ended
	Jun. 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 June 30, 2017 and 2016, the Company had cash collateral on deposit with Citibank of $0 and $11.9 million, respectively. 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	6 Months Ended
	Jun. 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 the 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 are based on third party pricing services. These loans are classified as Level 2. During the three months and six months ended June 30, 2017, the Company recorded a $3.2 million and $6.0 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 six months ended June 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 six months ended June 30, 2017, the Company recorded a gain of $0.01 million and a gain of $0.2 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 $0.3 million expense to write down other real estate owned to fair value. The following table presents recorded amounts of assets and liabilities measured at fair value on a recurring and nonrecurring basis as of June 30, 2017, by caption in the consolidated balance sheet and by ASC 820 valuation hierarchy. Quoted Prices in Active Markets for Identical Assets (Level 1) Significant Other Observable Inputs (Level 2) Significant Unobservable Inputs (Level 3) Total Carrying Value in Consolidated Balance Sheet ($ in thousands) Recurring Basis: Assets: Investments in debt securities, available-for-sale $ — $ — $ 151,426 $ 151,426 Loans — 403,129 — 403,129 Total assets recorded at fair value on a recurring basis $ — $ 403,129 $ 151,426 $ 554,555 Nonrecurring Basis: Assets: Loans held-for-sale $ — $ 26,032 $ 7,075 $ 33,107 Other real estate owned/repossessed assets — — 15,632 15,632 Total assets recorded at fair value on a nonrecurring basis $ — $ 26,032 $ 22,707 $ 48,739 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 June 30, 2017. Fair Valuation Techniques Unobservable Input Range ($ in thousands) Financial assets: Investments in debt securities, available-for-sale $ 151,426 Third-party Pricing Loans held-for-sale 7,075 Market comparables Cost to Sell 3%-7% Valuation model Marketability discount 5%-30% Other real estate/repossessed assets 15,632 Appraisal Cost to sell 3%- 7% Total Assets: $ 174,133 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 six months ended June 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 six months ended June 30, 2017 and 2016. During the six months ended June 30, 2017 it was determined that the contingent liability was no longer measured at fair value. For the three months ended June 30, 2017: Investments Debt Securities, Available-for-sale ($ Balance as of March 31, 2017 $ 127,543 Total gains or losses (realized/unrealized) Included in earnings 279 Included in other comprehensive income (loss) 3,498 Purchases 26,005 Issuances — Settlements (5,899 ) Balance as of June 30, 2017 $ 151,426 For the three months ended June 30, 2016: Investments Debt Securities, Available-for-sale ($ Balance as of March 31, 2016 $ 89,687 Total gains or losses (realized/unrealized) Included in earnings 137 Included in other comprehensive income (loss) 1,576 Purchases — Issuances — Settlements — Balance as of June 30, 2016 $ 91,400 For the six months ended June 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 384 Included in other comprehensive income (loss) 8,041 Purchases 29,613 Issuances — Settlements (5,919 ) Balance as of June 30, 2017 $ 151,426 For the six months ended June 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 313 Included in other comprehensive income (loss) (3,090 ) Purchases — Issuances — Settlements — Balance as of June 30, 2016 $ 91,400 The following table presents the carrying amounts and estimated fair values of the Company’s financial instruments at June 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. June 30, 2017 December 31, 2016 Carrying amount Fair Carrying amount Fair ($ in thousands) Financial assets: Cash and cash equivalents $ 49,721 $ 49,721 $ 154,480 $ 154,480 Restricted cash 223,268 223,268 262,643 262,643 Cash collateral on deposit with custodians 7,564 7,564 7,564 7,564 Investments in debt securities available-for-sale 151,426 151,426 119,307 119,307 Loans held-for-sale, net 346,626 354,242 144,060 145,406 Loans, net 3,037,363 3,036,161 3,239,191 3,241,910 Other assets 18,453 18,453 15,954 15,954 Financial liabilities: Credit facilities, net $ 396,139 $ 396,139 $ 445,493 $ 445,493 Term debt, net 2,097,459 2,169,976 2,195,064 2,230,102 Senior notes, net 374,830 388,778 373,919 380,000 Subordinated notes, net 245,082 316,821 241,390 303,916 Repurchase agreements, net 79,269 79,269 55,046 55,046 Other liabilities 1,000 1,000 1,350 1,350 The carrying amounts shown in the table are included in the consolidated balance sheets under the indicated captions. The following table presents the carrying amounts, estimated fair values, and placement in the fair value hierarchy of the Company’s financial instruments at June 30, 2017 and December 31, 2016. The table excludes financial instruments for which the carrying amount approximates fair value such as cash and cash equivalents, restricted cash, cash collateral on deposit with custodian, investments in debt securities available-for-sale, loans held at fair value, and financial information disclosed above. Fair Value Measurements June 30, 2017 Carrying amount Fair Level 1 Level 2 Level 3 ($ in thousands) Financial assets: Loans, net $ 2,634,234 $ 2,633,032 $ — $ — $ 2,633,032 Loans held-for-sale, net 346,626 354,242 — 145,676 208,566 Other assets 18,453 18,453 — — 18,453 Financial liabilities: Credit facilities, net 396,139 396,139 — 396,139 — Term debt securitizations, net 2,097,459 2,169,976 — 2,169,976 — Repurchase agreements, net 79,269 79,269 — 79,269 — Senior notes, net 374,830 388,778 — 388,778 — Subordinated notes, net 245,082 316,821 — — 316,821 Other liabilities 1,000 1,000 — — 1,000 Fair Value Measurements December 31, 2016 Carrying amount Fair Level 1 Level 2 Level 3 ($ in thousands) Financial assets: Loans, net (1) $ 2,835,446 $ 2,838,165 $ — $ — $ 2,838,165 Loans held-for-sale, net 144,060 145,406 — 69,875 75,531 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 — Repurchase agreements, net 55,046 55,046 — 55,046 — Senior notes, net 373,919 380,000 — 380,000 — Subordinated notes, net 241,390 303,916 — — 303,916 Other liabilities 1,350 1,350 — — 1,350 (1) These numbers have been adjusted to exclude $403.7 million of loans held at fair value to be consistent with current year presentation. 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. Cash and cash equivalents, restricted cash and cash collateral on deposit with custodians: The carrying amounts approximate fair value because of the short maturity of these instruments. Credit facilities: Due to the adjustable rate nature of the borrowings, 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 securitizations: 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: The fair value was determined by applying prevailing repurchase agreement market interest rates to the Company’s current repurchase agreement structure. Senior notes: The fair value was based on available quoted market prices. Subordinated notes: 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 $18.5 million and $16.0 million, as of June 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 June 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	6 Months Ended
	Jun. 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. 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 middle market loans, 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 June 30, 2017 Commercial Lending Asset Management Consolidated Total Net interest income: $ 13,786 $ 1,222 $ 15,008 Provision for loan losses 2,698 — 2,698 Net interest income after provision 11,088 1,222 12,310 Noninterest income: Management fees — 2,827 2,827 Performance fees — 999 999 Other lending fees 2,129 32 2,161 Gain/(loss) on sale of loans and equipment 127 384 511 Other noninterest income (1) 1,898 (3,217 ) (1,319 ) Total noninterest income: 4,154 1,025 5,179 Non-interest expense 8,377 1,922 10,299 Income before income taxes $ 6,865 $ 325 $ 7,190 Income tax expense 3,038 Net income $ 4,152 (1) Includes fair value adjustments on Loans held-for-sale and fair value portfolio. Six Months Ended June 30, 2017 Commercial Lending Asset Management Consolidated Total Net interest income: $ 26,641 $ 2,355 $ 28,996 Provision for loan losses 8,847 — 8,847 Net interest income after provision 17,794 2,355 20,149 Noninterest income: Management fees — 6,128 6,128 Performance fees — 1,345 1,345 Other lending fees 5,269 85 5,354 Gain/(loss) on sale of loans and equipment 219 988 1,207 Other noninterest income (1) 3,309 (6,013 ) (2,704 ) Total noninterest income: 8,797 2,533 11,330 Non-interest expense 17,858 4,078 21,936 Income before income taxes $ 8,733 $ 810 $ 9,543 Income tax expense 4,009 Net income $ 5,534 (1) Includes fair value adjustments on Loans held-for-sale and fair value portfolio. Three months ended June 30, 2016 Commercial Lending Asset Management Consolidated Total ($ in thousands) Net interest income $ 19,760 $ 1,146 $ 20,906 Provision for loan losses 3,623 — 3,623 Net interest income after provision 16,137 1,146 17,283 Noninterest income: Management fees — 3,096 3,096 Performance fees — 447 447 Other lending fees 1,665 32 1,697 Gain/(loss) on sale of loans and equipment 347 145 492 Other noninterest income (1) (1,755 ) 382 (1,373 ) Total Noninterest income: 257 4,102 4,359 Non-interest expense 10,359 2,481 12,840 Income before income taxes $ 6,035 $ 2,767 $ 8,802 Income tax expense 3,561 Net income $ 5,241 (1) Includes fair value adjustment on Loans held-for-sale. Six months ended June 30, 2016 Commercial Lending Asset Management Consolidated Total ($ in thousands) Net interest income $ 41,617 $ 1,808 $ 43,425 Provision for loan losses 21,336 — 21,336 Net interest income after provision 20,281 1,808 22,089 Noninterest income: Management fees — 6,143 6,143 Performance fees — 841 841 Other lending fees 2,858 32 2,890 Gain/(loss) on sale of loans and equipment 462 145 607 Other noninterest income (1) 12,760 270 13,030 Total Noninterest income: 16,080 7,431 23,511 Non-interest expense 25,194 4,714 29,908 Income before income taxes $ 11,167 $ 4,525 $ 15,692 Income tax expense 6,442 Net income $ 9,250 (1) Includes fair value adjustments on Loans held-for-sale and fair value portfolio. June 30, 2017 Commercial Lending Asset Management Total ($ in thousands) Loans and leases, gross (including loans at fair value of $403,129) $ 2,706,944 $ 403,129 $ 3,110,073 Loans held-for-sale, gross 349,757 — 349,757 Investments in debt securities, available-for-sale — 151,426 151,426 Other 236,631 83,508 320,139 Total Balance Sheet Assets 3,293,332 638,063 3,931,395 Illiquid Credit funds * — 1,317,552 1,317,552 Liquid/Tradeable Credit * — 1,584,783 1,584,783 Total Assets 3,293,332 3,540,398 6,833,730 Less: Non Managed assets (1) 236,631 75,687 312,318 Total Managed Assets $ 3,056,701 $ 3,464,711 $ 6,521,412 * 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	6 Months Ended
	Jun. 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 six months ended June 30, 2017, the fund paid the Company $0.05 and $0.09 million, respectively, and for the three and six months ended June 30, 2016, the Fund paid the Company zero and $0.04 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 six months ended June 30, 2017 the Arlington Program’s collateral management fee was $0.5 million and $1.0 million, respectively and for the three and six months ended June 30, 2016, the Arlington Program’s collateral management fee was $0.5 million and $1.0 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 six months ended June 30, 2017, the Clarendon Fund’s collateral management fee was $0.5 million and $1.0 million, respectively and for the three and six months ended June 30, 2016, the Clarendon Fund’s collateral management fee was $0.5 million and $1.0 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 six months ended June 30, 2017, the Berkeley Fund’s collateral management fee was $0.4 million and $1.1 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 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 six months ended June 30, 2017, the Longfellow Fund’s collateral management fee was $0.3 million and $1.0 million , respectively, and for the three and six months ended June 30, 2016, the Longfellow Fund’s collateral management fee was $0.4 million and $0.8 million, respectively

Subsequent Events

Subsequent Events	6 Months Ended
	Jun. 30, 2017
Subsequent Events [Abstract]
Subsequent Events	Note 17. Subsequent Events On July 20, 2017, the Company acquired Fifth Street CLO Management LLC, a wholly-owned subsidiary of Fifth Street Holdings L.P. The purchase included contracts to manage two middle market CLOs and certain interests in the CLOs held by the Company to comply with risk retention requirements. . On July 31, 2017, our Board of Directors declared a dividend of $0.02 per share, to be paid on September 15, 2017 to stockholders of record on August 29, 2017.

Summary of Significant Accoun27

Summary of Significant Accounting Policies (Policies)	6 Months Ended
	Jun. 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 (collectively, “NewStar”) and have been prepared in accordance with U.S. generally accepted accounting principles (“GAAP”). All significant intercompany transactions have been eliminated in consolidation. These interim condensed financial statements include adjustments of a normal and recurring nature considered necessary by management to fairly present NewStar’s financial position, results of operations and cash flows. These interim condensed financial statements may not be indicative of financial results for the full year. The preparation of financial statements in conformity with GAAP requires management to make estimates and assumptions that affect certain reported amounts and disclosure of contingent assets and liabilities. Actual results could differ from those estimates. The estimates most susceptible to change in the near-term are the Company’s estimates of its (i) allowance for credit losses, (ii) recorded amounts of deferred income taxes, (iii) fair value measurements used to record fair value adjustments to certain financial instruments, (iv) valuation of investments, (v) determination of other than temporary impairments and temporary impairments and (vi) impairment of goodwill and identified intangible assets. The interim condensed consolidated financial statements and notes thereto should be read in conjunction with the Company’s Annual Report on Form 10-K for the year ended December 31, 2016.
Prior Period Reclassification	Prior Period Reclassification Prior period amounts are reclassified wherever necessary to confirm with current period presentation.
Segment Reporting	Segment Reporting Due to the continued expansion of our asset management activities, through new fund formation and the acquisition of NewStar Capital, the Company reassessed its classification of reporting as a single segment under ASC 280, Segment Reporting
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
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 2017-01, Business Combinations (Topic 805): Clarifying the Definition of a Business. ASU 2017-01 is 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.

Loans Held-for-Sale, Loans, L28

Loans Held-for-Sale, Loans, Leases and Allowance for Credit Losses (Tables)	6 Months Ended
	Jun. 30, 2017
Receivables [Abstract]
Loans Held-for-Sale	As of June 30, 2017 and December 31, 2016, loans held-for-sale consisted of the following: June 30, 2017 December 31, 2016 ($ in thousands) Leveraged Finance $ 350,016 $ 146,126 Lower cost or market adjustment (259 ) (160 ) Gross loans held-for-sale 349,757 145,966 Deferred loan fees, net (3,131 ) (1,906 ) Loans held-for-sale, net $ 346,626 $ 144,060
Summary of Loans	As of June 30, 2017, and December 31, 2016, loans consisted of the following: June 30, 2017 December 31, 2016 ($ in thousands) Leveraged Finance (1) $ 3,099,400 $ 3,308,926 Real Estate 10,673 10,624 Gross loans 3,110,073 3,319,550 Deferred loan fees and discount, net (25,898 ) (29,423 ) Allowance for loan losses (46,812 ) (50,936 ) Total loans, net $ 3,037,363 $ 3,239,191 (1) Includes loans at fair value of $ 403.1 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) June 30, 2017 Impaired loans $ 121,822 $ 115,207 $ 151,190 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) June 30, 2017 Impaired loans $ 79,116 $ 74,497 $ 42,706 $ 40,710 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 June 30, 2017 Investment Allowance Investment Allowance ($ in thousands) Collectively evaluated (1)(2) $ 2,574,449 $ 30,357 $ 10,673 $ 92 Individually evaluated (3) 121,822 16,363 — — Total $ 2,696,271 $ 46,720 $ 10,673 $ 92 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 June 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 $403.1 million at June 30, 2017 and $403.7 million at December 31, 2016 of Leveraged Finance loans which the Company elected to record at fair value. (3) Represents loans individually evaluated for impairment in accordance with ASU 310-10, Receivables,
Summary of Company's Investment in Nonaccrual Loans	Below is a summary of the Company’s investment in nonaccrual loans. Recorded Investment in Nonaccrual Loans June 30, 2017 December ($ in thousands) Nonaccrual loans $ 95,102 $ 99,233 Less: Deferred loan fees (6,615 ) (6,485 ) Add back: Interest receivable 182 116 Total $ 88,669 $ 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 June 30, 2017 and December 31, 2016 is provided below: Group I Group II ($ in thousands) June 30, 2017 $ 94,881 $ 62,057 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 June 30, 2017 Pre-Modification Outstanding Recorded Investment Post-Modification Outstanding Recorded Investment Investment in TDR Subsequently Defaulted ($ in thousands) Leveraged Finance $ — $ — $ 14,615 Total $ — $ — $ 14,615 As of the Six Months Ended June 30, 2017 Pre-Modification Outstanding Recorded Investment Post-Modification Outstanding Recorded Investment Investment in TDR Subsequently Defaulted ($ in thousands) Leveraged Finance $ — $ — $ 29,971 Total $ — $ — $ 29,971 As of the Three and Six Months Ended June 30, 2016 Pre-Modification Outstanding Recorded Investment Post-Modification Outstanding Recorded Investment Investment in TDR Subsequently Defaulted ($ in thousands) Leveraged Finance $ 1,775 $ 1,308 $ — Real Estate — — 4,483 Total $ 1,775 $ 1,308 $ 4,483
Breakdown of Troubled Debt Restructurings	The following sets forth a breakdown of troubled debt restructurings at June 30, 2017 and December 31, 2016: As of June 30, 2017 Accrual Status For the six months ($ in thousands) Loan Type Accruing Nonaccrual Impaired Balance Specific Allowance Charged-off Leveraged Finance $ 16,087 $ 78,801 $ 94,888 $ 10,791 $ 7,494 Total $ 16,087 $ 78,801 $ 94,888 $ 10,791 $ 7,494 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) June 30, 2017 Leveraged Finance $ — $ 14,110 $ 14,110 $ 3,085,290 $ 3,099,400 $ — Real Estate — — — 10,673 10,673 — Total $ — $ 14,110 $ 14,110 $ 3,095,963 $ 3,110,073 $ — 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 June 30, 2017 Leveraged Finance Real Estate Total ($ in thousands) Balance, beginning of period $ 51,989 $ 92 $ 52,081 Provision (reversal) for credit losses—general (600 ) — (600 ) Provision for credit losses—specific 3,297 — 3,297 Loans charged off, net of recoveries (7,494 ) — (7,494 ) Balance, end of period $ 47,192 $ 92 $ 47,284 Balance, end of period—specific $ 16,363 $ — $ 16,363 Balance, end of period—general $ 30,829 $ 92 $ 30,921 Average balance of impaired loans $ 129,780 $ — $ 129,780 Interest recognized from impaired loans $ 267 $ — $ 267 Loans (1) Loans individually evaluated with specific allowance $ 79,116 $ — $ 79,116 Loans individually evaluated with no specific allowance 42,706 — 42,706 Loans collectively evaluated with general allowance 2,574,449 10,673 2,585,122 Total loans $ 2,696,271 $ 10,673 $ 2,706,944 (1) Excludes $403.1 million of Leveraged Finance loans which the Company elected to record at fair value. Six Months Ended June 30, 2017 Leveraged Finance Real Estate Total ($ in thousands) Balance, beginning of period $ 51,316 $ 92 $ 51,408 Provision for credit losses—general (715 ) — (715 ) Provision for credit losses—specific 9,561 — 9,561 Loans charged off, net of recoveries (12,970 ) — (12,970 ) Balance, end of period $ 47,192 $ 92 $ 47,284 Balance, end of period—specific $ 16,363 $ — $ 16,363 Balance, end of period—general $ 30,829 $ 92 $ 30,921 Average balance of impaired loans $ 210,441 $ — $ 210,441 Interest recognized from impaired loans $ 1,915 $ — $ 1,915 Three Months Ended June 30, 2016 Leveraged Finance Real Estate Equipment Finance Total ($ in thousands) Balance, beginning of period $ 61,528 $ 4,422 $ 1,342 $ 67,292 Provision for credit losses—general 1,198 44 (35 ) 1,207 Provision for credit losses—specific 2,308 108 — 2,416 Loans charged off, net of recoveries (2,389 ) (4,483 ) — (6,872 ) Balance, end of period $ 62,645 $ 91 $ 1,307 $ 64,043 Balance, end of period—specific $ 32,880 $ — $ — $ 32,880 Balance, end of period—general $ 29,765 $ 91 $ 1,307 $ 31,163 Average balance of impaired loans $ 177,654 $ 34,209 $ — $ 211,863 Average net book value of impaired leases $ — $ — $ 660 $ 660 Interest recognized from impaired loans $ 3,083 $ 785 $ 12 $ 3,880 Loans (1) Loans individually evaluated with specific allowance $ 117,501 $ — $ — $ 117,501 Loans individually evaluated with no specific allowance 39,981 7,188 623 47,792 Loans collectively evaluated with general allowance 2,720,144 10,553 164,611 2,895,308 Total loans $ 2,877,626 $ 17,741 $ 165,234 $ 3,060,601 (1) Excludes $167.2 million of Leveraged Finance loans which the Company elected to record at fair value. Six Months Ended June 30, 2016 Leveraged Finance Business Credit Real Estate Equipment Finance Total ($ in thousands) Balance, beginning of period $ 54,788 $ 1,991 $ 656 $ 1,291 $ 58,726 Provision for credit losses—general 1,425 (172 ) 1,009 16 2,278 Provision for credit losses—specific 14,881 — 4,177 — 19,058 Reversal due to sale of Business Credit — (1,819 ) 0 — (1,819 ) Loans charged off, net of recoveries (8,449 ) — (5,751 ) — (14,200 ) Balance, end of period $ 62,645 $ — $ 91 $ 1,307 $ 64,043 Balance, end of period—specific $ 32,880 $ — $ — $ — $ 32,880 Balance, end of period—general $ 29,765 $ — $ 91 $ 1,307 $ 31,163 Average balance of impaired loans $ 177,181 $ — $ 34,540 $ — $ 211,721 Average net book value of impaired leases $ — $ — $ — $ 723 $ 723 Interest recognized from impaired loans $ 4,979 $ — $ 832 $ 12 $ 5,823

Restricted Cash (Tables)

Restricted Cash (Tables)	6 Months Ended
	Jun. 30, 2017
Cash And Cash Equivalents [Abstract]
Summary of Restricted Cash	Restricted cash as of June 30, 2017 and December 31, 2016 was as follows: June 30, 2017 December 31, 2016 ($ in thousands) Collections on loans pledged to credit facilities $ 37,731 $ 43,822 Principal and interest collections on loans held in trust and prefunding amounts 185,403 216,501 Customer escrow accounts 134 2,320 Total $ 223,268 $ 262,643

Investments in Debt Securitie30

Investments in Debt Securities, Available-for-Sale (Tables)	6 Months Ended
	Jun. 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 June 30, 2017 and December 31, 2016 was as follows: June 30, 2017 December 31, 2016 ($ in thousands) Investments in debt securities—gross $ 157,326 $ 132,180 Unamortized discount (7,822 ) (6,743 ) Investments in debt securities—amortized cost $ 149,504 $ 125,437
Summary of Amortized Cost, Gross Unrealized Holding Gains, Gross Unrealized Holding Losses, and Fair Value of Available-for-Sale Securities	At June 30, 2017 and December 31, 2016 investments in non-NewStar managed issuers totaled $74.0 million and $75.8 million, respectively. The amortized cost, gross unrealized holding gains, gross unrealized holding losses, and fair value of available-for-sale securities at June 30, 2017 and December 31, 2016 were as follows: Amortized cost Gross unrealized holding gains Gross unrealized holding losses Fair value ($ in thousands) June 30, 2017 Collateralized loan obligations $ 149,504 $ 2,923 $ (1,001 ) $ 151,426 $ 149,504 $ 2,923 $ (1,001 ) $ 151,426 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 $ 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 June 30, 2017 and December 31, 2016: June 30, 2017 Less than 12 Months Greater than or Equal to 12 Months Total ($ in thousands) Number of positions 4 4 8 Fair value $ 9,429 $ 16,340 $ 25,769 Amortized cost 9,683 17,087 26,770 Unrealized loss $ (254 ) $ (747 ) $ (1,001 ) 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 June 30, 2017 and December 31, 2016: June 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 85,866 87,344 53,177 48,404 Due after ten years through fifteen years 63,638 64,082 72,169 70,883 Total $ 149,504 $ 151,426 $ 125,437 $ 119,307

Borrowings (Tables)

Borrowings (Tables)	6 Months Ended
	Jun. 30, 2017
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 June 30, 2017 Interest rate Legal final maturity ($ in thousands) 2012-2 CLO Class A $ 190,700 $ 66,364 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 $ 155,264
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 June 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 June 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 June 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 June 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 June 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 June 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)	6 Months Ended
	Jun. 30, 2017
Equity [Abstract]
Schedule of Authorized Capital	As of June 30, 2017 and December 31, 2016, the Company’s authorized capital consists of preferred and common stock and the following was authorized and outstanding: June 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 41,758 145,000 42,820
Schedule of Restricted Stock Activity	Restricted stock activity for the six months ended June 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 (382,641 ) (3,184 ) Forfeited (2,543 ) (25 ) Non-vested as of June 30, 2017 796,589 $ 6,705
Schedule of Stock Option Activity	Stock option activity for the six months ended June 30, 2017 was as follows: Options Outstanding as of December 31, 2016 421,692 Granted — Exercised (251,692 ) Forfeited (10,000 ) Outstanding as of June 30, 2017 160,000 Vested and exercisable as of June 30, 2017 160,000

Earnings Per Share (Tables)

Earnings Per Share (Tables)	6 Months Ended
	Jun. 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 six months ended June 30, 2017 and 2016 are as follows: Three Months Ended June 30, Six Months Ended June 30, 2017 2016 2017 2016 (In thousands) Numerator: Net income to common shareholders $ 4,152 $ 5,241 $ 5,534 $ 9,250 Net income allocated to participating securities - basic and diluted 79 94 104 151 Net income allocated to common shareholders - basic and diluted 4,073 5,147 5,430 9,099 Denominator: Denominator for basic earnings per common share 41,225 46,011 41,512 46,157 Denominator for diluted earnings per common share: Denominator for basic earnings per common share 41,225 46,011 41,512 46,157 Potentially dilutive securities - options 25 — 29 - Total weighted average diluted shares 41,250 46,011 41,541 46,157 Earnings per common share Basic $ 0.10 $ 0.11 $ 0.13 $ 0.20 Diluted $ 0.10 $ 0.11 $ 0.13 $ 0.20

Variable Interest Entities (Tab

Variable Interest Entities (Tables)	6 Months Ended
	Jun. 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 June 30, 2017 and December 31, 2016: June 30, 2017 December 31, 2016 ($ in thousands) Unconsolidated VIE assets $ 1,423,263 $ 912,900 Unconsolidated VIE liabilities 831,527 810,030 Equity interest included on the Consolidated Balance Sheet 54,381 50,386 Maximum risk of loss (1) 55,223 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 Of35

Financial Instruments with Off-Balance Sheet Risk (Tables)	6 Months Ended
	Jun. 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: June 30, 2017 December 31, 2016 ($ in thousands) Unused lines of credit $ 306,113 $ 326,051 Standby letters of credit 6,825 8,239

Total Return Swap (Tables)

Total Return Swap (Tables)	6 Months Ended
	Jun. 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)	6 Months Ended
	Jun. 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 June 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 $ — $ — $ 151,426 $ 151,426 Loans — 403,129 — 403,129 Total assets recorded at fair value on a recurring basis $ — $ 403,129 $ 151,426 $ 554,555 Nonrecurring Basis: Assets: Loans held-for-sale $ — $ 26,032 $ 7,075 $ 33,107 Other real estate owned/repossessed assets — — 15,632 15,632 Total assets recorded at fair value on a nonrecurring basis $ — $ 26,032 $ 22,707 $ 48,739 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 June 30, 2017. Fair Valuation Techniques Unobservable Input Range ($ in thousands) Financial assets: Investments in debt securities, available-for-sale $ 151,426 Third-party Pricing Loans held-for-sale 7,075 Market comparables Cost to Sell 3%-7% Valuation model Marketability discount 5%-30% Other real estate/repossessed assets 15,632 Appraisal Cost to sell 3%- 7% Total Assets: $ 174,133 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 June 30, 2017: Investments Debt Securities, Available-for-sale ($ Balance as of March 31, 2017 $ 127,543 Total gains or losses (realized/unrealized) Included in earnings 279 Included in other comprehensive income (loss) 3,498 Purchases 26,005 Issuances — Settlements (5,899 ) Balance as of June 30, 2017 $ 151,426 For the three months ended June 30, 2016: Investments Debt Securities, Available-for-sale ($ Balance as of March 31, 2016 $ 89,687 Total gains or losses (realized/unrealized) Included in earnings 137 Included in other comprehensive income (loss) 1,576 Purchases — Issuances — Settlements — Balance as of June 30, 2016 $ 91,400 For the six months ended June 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 384 Included in other comprehensive income (loss) 8,041 Purchases 29,613 Issuances — Settlements (5,919 ) Balance as of June 30, 2017 $ 151,426 For the six months ended June 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 313 Included in other comprehensive income (loss) (3,090 ) Purchases — Issuances — Settlements — Balance as of June 30, 2016 $ 91,400
Carrying Amounts and Estimated Fair Values of Company's Financial Instruments	The following table presents the carrying amounts and estimated fair values of the Company’s financial instruments at June 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. June 30, 2017 December 31, 2016 Carrying amount Fair Carrying amount Fair ($ in thousands) Financial assets: Cash and cash equivalents $ 49,721 $ 49,721 $ 154,480 $ 154,480 Restricted cash 223,268 223,268 262,643 262,643 Cash collateral on deposit with custodians 7,564 7,564 7,564 7,564 Investments in debt securities available-for-sale 151,426 151,426 119,307 119,307 Loans held-for-sale, net 346,626 354,242 144,060 145,406 Loans, net 3,037,363 3,036,161 3,239,191 3,241,910 Other assets 18,453 18,453 15,954 15,954 Financial liabilities: Credit facilities, net $ 396,139 $ 396,139 $ 445,493 $ 445,493 Term debt, net 2,097,459 2,169,976 2,195,064 2,230,102 Senior notes, net 374,830 388,778 373,919 380,000 Subordinated notes, net 245,082 316,821 241,390 303,916 Repurchase agreements, net 79,269 79,269 55,046 55,046 Other liabilities 1,000 1,000 1,350 1,350
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 June 30, 2017 and December 31, 2016. The table excludes financial instruments for which the carrying amount approximates fair value such as cash and cash equivalents, restricted cash, cash collateral on deposit with custodian, investments in debt securities available-for-sale, loans held at fair value, and financial information disclosed above. Fair Value Measurements June 30, 2017 Carrying amount Fair Level 1 Level 2 Level 3 ($ in thousands) Financial assets: Loans, net $ 2,634,234 $ 2,633,032 $ — $ — $ 2,633,032 Loans held-for-sale, net 346,626 354,242 — 145,676 208,566 Other assets 18,453 18,453 — — 18,453 Financial liabilities: Credit facilities, net 396,139 396,139 — 396,139 — Term debt securitizations, net 2,097,459 2,169,976 — 2,169,976 — Repurchase agreements, net 79,269 79,269 — 79,269 — Senior notes, net 374,830 388,778 — 388,778 — Subordinated notes, net 245,082 316,821 — — 316,821 Other liabilities 1,000 1,000 — — 1,000 Fair Value Measurements December 31, 2016 Carrying amount Fair Level 1 Level 2 Level 3 ($ in thousands) Financial assets: Loans, net (1) $ 2,835,446 $ 2,838,165 $ — $ — $ 2,838,165 Loans held-for-sale, net 144,060 145,406 — 69,875 75,531 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 — Repurchase agreements, net 55,046 55,046 — 55,046 — Senior notes, net 373,919 380,000 — 380,000 — Subordinated notes, net 241,390 303,916 — — 303,916 Other liabilities 1,350 1,350 — — 1,350 (1) These numbers have been adjusted to exclude $403.7 million of loans held at fair value to be consistent with current year presentation.

Segment Reporting (Tables)

Segment Reporting (Tables)	6 Months Ended
	Jun. 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 June 30, 2017 Commercial Lending Asset Management Consolidated Total Net interest income: $ 13,786 $ 1,222 $ 15,008 Provision for loan losses 2,698 — 2,698 Net interest income after provision 11,088 1,222 12,310 Noninterest income: Management fees — 2,827 2,827 Performance fees — 999 999 Other lending fees 2,129 32 2,161 Gain/(loss) on sale of loans and equipment 127 384 511 Other noninterest income (1) 1,898 (3,217 ) (1,319 ) Total noninterest income: 4,154 1,025 5,179 Non-interest expense 8,377 1,922 10,299 Income before income taxes $ 6,865 $ 325 $ 7,190 Income tax expense 3,038 Net income $ 4,152 (1) Includes fair value adjustments on Loans held-for-sale and fair value portfolio. Six Months Ended June 30, 2017 Commercial Lending Asset Management Consolidated Total Net interest income: $ 26,641 $ 2,355 $ 28,996 Provision for loan losses 8,847 — 8,847 Net interest income after provision 17,794 2,355 20,149 Noninterest income: Management fees — 6,128 6,128 Performance fees — 1,345 1,345 Other lending fees 5,269 85 5,354 Gain/(loss) on sale of loans and equipment 219 988 1,207 Other noninterest income (1) 3,309 (6,013 ) (2,704 ) Total noninterest income: 8,797 2,533 11,330 Non-interest expense 17,858 4,078 21,936 Income before income taxes $ 8,733 $ 810 $ 9,543 Income tax expense 4,009 Net income $ 5,534 (1) Includes fair value adjustments on Loans held-for-sale and fair value portfolio. Three months ended June 30, 2016 Commercial Lending Asset Management Consolidated Total ($ in thousands) Net interest income $ 19,760 $ 1,146 $ 20,906 Provision for loan losses 3,623 — 3,623 Net interest income after provision 16,137 1,146 17,283 Noninterest income: Management fees — 3,096 3,096 Performance fees — 447 447 Other lending fees 1,665 32 1,697 Gain/(loss) on sale of loans and equipment 347 145 492 Other noninterest income (1) (1,755 ) 382 (1,373 ) Total Noninterest income: 257 4,102 4,359 Non-interest expense 10,359 2,481 12,840 Income before income taxes $ 6,035 $ 2,767 $ 8,802 Income tax expense 3,561 Net income $ 5,241 (1) Includes fair value adjustment on Loans held-for-sale. Six months ended June 30, 2016 Commercial Lending Asset Management Consolidated Total ($ in thousands) Net interest income $ 41,617 $ 1,808 $ 43,425 Provision for loan losses 21,336 — 21,336 Net interest income after provision 20,281 1,808 22,089 Noninterest income: Management fees — 6,143 6,143 Performance fees — 841 841 Other lending fees 2,858 32 2,890 Gain/(loss) on sale of loans and equipment 462 145 607 Other noninterest income (1) 12,760 270 13,030 Total Noninterest income: 16,080 7,431 23,511 Non-interest expense 25,194 4,714 29,908 Income before income taxes $ 11,167 $ 4,525 $ 15,692 Income tax expense 6,442 Net income $ 9,250 (1) Includes fair value adjustments on Loans held-for-sale and fair value portfolio. June 30, 2017 Commercial Lending Asset Management Total ($ in thousands) Loans and leases, gross (including loans at fair value of $403,129) $ 2,706,944 $ 403,129 $ 3,110,073 Loans held-for-sale, gross 349,757 — 349,757 Investments in debt securities, available-for-sale — 151,426 151,426 Other 236,631 83,508 320,139 Total Balance Sheet Assets 3,293,332 638,063 3,931,395 Illiquid Credit funds * — 1,317,552 1,317,552 Liquid/Tradeable Credit * — 1,584,783 1,584,783 Total Assets 3,293,332 3,540,398 6,833,730 Less: Non Managed assets (1) 236,631 75,687 312,318 Total Managed Assets $ 3,056,701 $ 3,464,711 $ 6,521,412 * 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)	6 Months Ended
	Jun. 30, 2017USD ($)BusinessSegment
Schedule Of Investment Income Reported Amounts By Category [Line Items]
Assets managed	$ 6,500,000,000
Number of business lines | Business	2
Number of operating segment | Segment	2
Minimum [Member] | Commercial Lending Segment
Schedule Of Investment Income Reported Amounts By Category [Line Items]
Annual cash flow (EBITDA) of companies financed through specialized lending groups	$ 15,000,000
Maximum [Member] | Commercial Lending Segment
Schedule Of Investment Income Reported Amounts By Category [Line Items]
Annual cash flow (EBITDA) of companies financed through specialized lending groups	50,000,000
NewStar Capital [Member]
Schedule Of Investment Income Reported Amounts By Category [Line Items]
Assets managed	2,000,000,000
Private Credit Funds [Member]
Schedule Of Investment Income Reported Amounts By Category [Line Items]
Assets managed	$ 1,300,000,000

Summary of Significant Accoun40

Summary of Significant Accounting Policies - Additional Information (Detail)	6 Months Ended
	Jun. 30, 2017Segment
Accounting Policies [Abstract]
Number of reportable segments	2

Disposition Activities - Additi

Disposition Activities - Additional Information (Detail) - USD ($)	Dec. 01, 2016	Mar. 31, 2016	Jun. 30, 2016	Jun. 30, 2017
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]
Gain on sale of Business Credit, net			$ 22,511,000
NewStar Equipment Finance Assets and Related Platform [Member]
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [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]
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]
Gain on sale of Business Credit, net		$ 22,500,000
Transaction related cost		$ 2,500,000

Loans Held-for-Sale, Loans, L42

Loans Held-for-Sale, Loans, Leases and Allowance for Credit Losses - Loans Held-for-Sale (Detail) - USD ($) $ in Thousands	Jun. 30, 2017	Dec. 31, 2016
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross loans held-for-sale	$ 3,110,073	$ 3,319,550
Deferred loan fees, net	(25,898)	(29,423)
Loans held-for-sale, net	3,037,363	3,239,191
Leveraged Finance [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross loans held-for-sale	3,099,400	3,308,926
Finance Receivables Loans Held For Sale [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross loans held-for-sale	349,757	145,966
Deferred loan fees, net	(3,131)	(1,906)
Loans held-for-sale, net	346,626	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	350,016	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	$ (259)	$ (160)

Loans Held-for-Sale, Loans, L43

Loans Held-for-Sale, Loans, Leases and Allowance for Credit Losses - Additional Information (Detail)	3 Months Ended			6 Months Ended		12 Months Ended
	Jun. 30, 2017USD ($)risk_factor	Mar. 31, 2017USD ($)	Jun. 30, 2016USD ($)	Jun. 30, 2017USD ($)risk_factor	Jun. 30, 2016USD ($)	Dec. 31, 2016USD ($)	Mar. 31, 2016USD ($)	Dec. 31, 2015USD ($)
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held-for-sale an aggregate outstanding balance	$ 349,757,000			$ 349,757,000		$ 145,966,000
Gain (loss) on sale of loans, net	511,000		$ 162,000	1,207,000	$ 55,000
Loans and leases, net	3,037,363,000			3,037,363,000		3,239,191,000
Impaired loans	121,822,000			121,822,000		133,413,000
Impaired loans restructured and classified as TDRs						114,800,000
Aggregate carrying value of equity investments	9,900,000			9,900,000		9,900,000
Recorded Investment in Nonaccrual Loans	95,102,000			95,102,000		99,233,000
Carrying value of non-accrual loans	88,700,000			88,700,000		92,900,000
Impaired loans, non-accrual status	0			8,500,000		27,100,000
Specific provisions for impaired loans during the year	3,300,000			9,600,000		24,800,000
Specific allowance for impaired loans	16,400,000			16,400,000
Impaired loans with specific allowance	$ 79,100,000			$ 79,100,000		$ 73,500,000
Number of days past due to classified as delinquent	60 days			60 days		60 days
Loans charged-off, net of recoveries	$ 7,494,000		6,872,000	$ 12,970,000	14,200,000
Non-accrual loan returned to performing status						$ 0
Specific allowance for impaired loans						19,800,000
Number of risk factors used to determine allowance for credit losses. | risk_factor	7			7
Allowance for unfunded commitments	$ 46,812,000			$ 46,812,000		50,936,000
Allowance for credit losses	47,284,000	$ 52,081,000	64,043,000	47,284,000	64,043,000	$ 51,408,000	$ 67,292,000	$ 58,726,000
Provision for credit losses	$ 2,698,000		3,623,000	$ 8,847,000	21,336,000
Financing receivable percentage of impaired and troubled debt restructuring to all loans	4.00%			4.00%		4.00%
Commitments To Extend Credit [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for unfunded commitments	$ 500,000			$ 500,000		$ 500,000
TDRs [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Impaired loans restructured and classified as TDRs	94,888,000			94,888,000		114,803,000
Range of commitment per borrower				5,400,000
Specific allowance for impaired loans	10,791,000			10,791,000		15,939,000
Impaired loans related to delinquent loans	78,801,000			78,801,000		90,436,000
Non-accrual Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, charged off	7,500,000			13,000,000
Loans charged-off, net of recoveries						25,700,000
Non-accrual Loans [Member] | TDRs [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans charged-off, net of recoveries	7,500,000			13,000,000
Nonperforming Financing Receivable
Accounts, Notes, Loans and Financing Receivable [Line Items]
Range of commitment per borrower		$ 8,300,000				11,900,000
Specific allowance for impaired loans	1,800,000			1,800,000		7,900,000
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	14,100,000			14,100,000		21,100,000
Criticized [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases, net	101,800,000			101,800,000		118,700,000
Impaired loans	101,800,000			101,800,000		118,700,000
Loans Pass [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases, net	3,000,000,000			3,000,000,000		$ 3,200,000,000
Other than NCOF [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans sold, outstanding balance amount	34,700,000		$ 129,400,000	34,700,000	129,400,000
Gain (loss) on sale of loans, net				100,000	$ (90,000)
Credit Funds [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held-for-sale an aggregate outstanding balance	$ 350,000,000			$ 350,000,000

Loans Held-for-Sale, Loans, L44

Loans Held-for-Sale, Loans, Leases and Allowance for Credit Losses - Summary of Loans (Detail) - USD ($) $ in Thousands	Jun. 30, 2017	Dec. 31, 2016
Financing Receivable, Impaired [Line Items]
Gross loans	$ 3,110,073	$ 3,319,550
Deferred loan fees, net	(25,898)	(29,423)
Allowance for loan losses	(46,812)	(50,936)
Loans held-for-sale, net	3,037,363	3,239,191
Leveraged Finance [Member]
Financing Receivable, Impaired [Line Items]
Gross loans	3,099,400	3,308,926
Allowance for loan losses	(46,720)	(50,844)
Real Estate [Member]
Financing Receivable, Impaired [Line Items]
Gross loans	10,673	10,624
Allowance for loan losses	$ (92)	$ (92)

Loans Held-for-Sale, Loans, L45

Loans Held-for-Sale, Loans, Leases and Allowance for Credit Losses - Summary of Loans (Parenthetical) (Detail) - USD ($) $ in Thousands	Jun. 30, 2017	Dec. 31, 2016
Financing Receivable, Impaired [Line Items]
Loans at fair value	$ 2,633,032	$ 2,838,165
Commercial Lending and Asset Management [Member]
Financing Receivable, Impaired [Line Items]
Loans at fair value	$ 403,129	$ 403,745

Loans Held-for-Sale, Loans, L46

Loans Held-for-Sale, Loans, Leases and Allowance for Credit Losses - Summary of Impaired Loans (Detail) - USD ($) $ in Thousands	Jun. 30, 2017	Dec. 31, 2016
Loans Held For Sale Loans And Allowance For Credit Losses [Abstract]
Investment, Net of Charge-offs	$ 121,822	$ 133,413
Investment, Net of Unamortized Discount/Premium	115,207	126,839
Unpaid Principal	151,190	154,879
Recorded Investment with a Related Allowance for Credit Losses	79,116	73,499
Recorded Investment, net, with a Related Allowance for Credit Losses	74,497	68,924
Recorded Investment without a Related Allowance for Credit Losses	42,706	59,914
Recorded Investment, net, without a Related Allowance for Credit Losses	$ 40,710	$ 57,915

Loans Held-for-Sale, Loans, L47

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	Jun. 30, 2017	Dec. 31, 2016	Jun. 30, 2016
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance, Total	$ 46,812	$ 50,936
Investment, Collectively evaluated	2,585,122		$ 2,895,308
Total investment evaluated	2,706,944		3,060,601
Leveraged Finance [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance, Collectively evaluated	30,357	31,073
Allowance, Individually evaluated	16,363	19,771
Allowance, Total	46,720	50,844
Investment, Collectively evaluated	2,574,449	2,771,768	2,720,144
Investment, Individually evaluated	121,822	133,413
Total investment evaluated	2,696,271	2,905,181	2,877,626
Real Estate [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance, Collectively evaluated	92	92
Allowance, Total	92	92
Investment, Collectively evaluated	10,673	10,624	10,553
Total investment evaluated	$ 10,673	$ 10,624	$ 17,741

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 (Parenthetical) (Detail) $ in Thousands	6 Months Ended	12 Months Ended
	Jun. 30, 2017USD ($)	Dec. 31, 2016USD ($)
Financing Receivable, Allowance for Credit Losses [Line Items]
Fair value of loans acquired	$ 2,169,976	$ 2,230,102
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	$ 403,100	$ 403,700
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, L49

Loans Held-for-Sale, Loans, Leases and Allowance for Credit Losses - Summary of Company's Investment in Nonaccrual Loans (Detail) - USD ($) $ in Thousands	Jun. 30, 2017	Dec. 31, 2016
Loans Held For Sale Loans And Allowance For Credit Losses [Abstract]
Nonaccrual loans	$ 95,102	$ 99,233
Less: Deferred loan fees	(6,615)	(6,485)
Add back: Interest receivable	182	116
Total	$ 88,669	$ 92,864

Loans Held-for-Sale, Loans, L50

Loans Held-for-Sale, Loans, Leases and Allowance for Credit Losses - Summary of Types of Concessions with Respect to TDRs (Detail) - USD ($) $ in Thousands	Jun. 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	$ 94,881	114,803
Group II [Member]
Troubled Debt Restructuring, Debtor, Subsequent Periods [Line Items]
Impaired loans restructured and classified as TDRs	$ 62,057	$ 77,061

Loans Held-for-Sale, Loans, L51

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		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Financing Receivable, Modifications [Line Items]
Pre-Modification Outstanding Recorded Investment		$ 1,775		$ 1,775
Post-Modification Outstanding Recorded Investment		1,308		1,308
Investment in TDR Subsequently Defaulted	$ 14,615	4,483	$ 29,971	4,483
Leveraged Finance [Member]
Financing Receivable, Modifications [Line Items]
Pre-Modification Outstanding Recorded Investment		1,775		1,775
Post-Modification Outstanding Recorded Investment		1,308		1,308
Investment in TDR Subsequently Defaulted	$ 14,615		$ 29,971
Real Estate [Member]
Financing Receivable, Modifications [Line Items]
Investment in TDR Subsequently Defaulted		$ 4,483		$ 4,483

Loans Held-for-Sale, Loans, L52

Loans Held-for-Sale, Loans, Leases and Allowance for Credit Losses - Breakdown of Troubled Debt Restructurings (Detail) - USD ($) $ in Thousands	6 Months Ended	12 Months Ended
	Jun. 30, 2017	Dec. 31, 2016
Troubled Debt Restructuring, Debtor, Subsequent Periods [Line Items]
Impaired Balance		$ 114,800
Specific Allowance	$ 16,400
TDRs [Member]
Troubled Debt Restructuring, Debtor, Subsequent Periods [Line Items]
Accruing	16,087	24,367
Nonaccrual	78,801	90,436
Impaired Balance	94,888	114,803
Specific Allowance	10,791	15,939
Charged- off	7,494	26,684
TDRs [Member] | Leveraged Finance [Member]
Troubled Debt Restructuring, Debtor, Subsequent Periods [Line Items]
Accruing	16,087	24,367
Nonaccrual	78,801	90,436
Impaired Balance	94,888	114,803
Specific Allowance	10,791	15,939
Charged- off	$ 7,494	$ 26,684

Loans Held-for-Sale, Loans, L53

Loans Held-for-Sale, Loans, Leases and Allowance for Credit Losses - Age Analysis of Delinquent Receivables (Detail) - USD ($) $ in Thousands	Jun. 30, 2017	Dec. 31, 2016
Financing Receivable Recorded Investment Past Due [Line Items]
Total Past Due	$ 14,110	$ 21,135
Current	3,095,963	3,298,415
Total Loans	3,110,073	3,319,550
Leveraged Finance [Member]
Financing Receivable Recorded Investment Past Due [Line Items]
Total Past Due	14,110	21,135
Current	3,085,290	3,287,791
Total Loans	3,099,400	3,308,926
Real Estate [Member]
Financing Receivable Recorded Investment Past Due [Line Items]
Current	10,673	10,624
Total Loans	10,673	10,624
Financing Receivables, Equal to Greater than 90 Days Past Due [Member]
Financing Receivable Recorded Investment Past Due [Line Items]
Total Past Due	14,110	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	$ 14,110	$ 21,135

Loans Held-for-Sale, Loans, L54

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		6 Months Ended		12 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016	Dec. 31, 2016
Financing Receivable, Allowance for Credit Losses [Line Items]
Balance, beginning of period	$ 52,081	$ 67,292	$ 51,408	$ 58,726	$ 58,726
Provision (reversal) for credit losses—general	(600)	1,207	(715)	2,278
Provision for credit losses—specific	3,297	2,416	9,561	19,058
Reversal due to sale of Business Credit				(1,819)
Loans charged off, net of recoveries	(7,494)	(6,872)	(12,970)	(14,200)
Balance, end of period	47,284	64,043	47,284	64,043	51,408
Balance, end of period—specific	16,363	32,880	16,363	32,880
Balance, end of period—general	30,921	31,163	30,921	31,163
Average balance of impaired loans and leases	129,780	211,863	210,441	211,721
Interest recognized from impaired loans	267	3,880	1,915	5,823
Loans individually evaluated with specific allowance	79,116	117,501	79,116	117,501
Loans individually evaluated with no specific allowance	42,706	47,792	42,706	47,792
Loans collectively evaluated with general allowance	2,585,122	2,895,308	2,585,122	2,895,308
Total investment evaluated	2,706,944	3,060,601	2,706,944	3,060,601
Leases [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Average balance of impaired loans and leases		660		723
Leveraged Finance [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Balance, beginning of period	51,989	61,528	51,316	54,788	54,788
Provision (reversal) for credit losses—general	(600)	1,198	(715)	1,425
Provision for credit losses—specific	3,297	2,308	9,561	14,881
Reversal due to sale of Business Credit				0
Loans charged off, net of recoveries	(7,494)	(2,389)	(12,970)	(8,449)
Balance, end of period	47,192	62,645	47,192	62,645	51,316
Balance, end of period—specific	16,363	32,880	16,363	32,880
Balance, end of period—general	30,829	29,765	30,829	29,765
Average balance of impaired loans and leases	129,780	177,654	210,441	177,181
Interest recognized from impaired loans	267	3,083	1,915	4,979
Loans individually evaluated with specific allowance	79,116	117,501	79,116	117,501
Loans individually evaluated with no specific allowance	42,706	39,981	42,706	39,981
Loans collectively evaluated with general allowance	2,574,449	2,720,144	2,574,449	2,720,144	2,771,768
Total investment evaluated	2,696,271	2,877,626	2,696,271	2,877,626	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	4,422	92	656	656
Provision (reversal) for credit losses—general	0	44	0	1,009
Provision for credit losses—specific	0	108	0	4,177
Reversal due to sale of Business Credit				0
Loans charged off, net of recoveries	0	(4,483)	0	(5,751)
Balance, end of period	92	91	92	91	92
Balance, end of period—specific	0	0	0	0
Balance, end of period—general	92	91	92	91
Average balance of impaired loans and leases	0	34,209	0	34,540
Interest recognized from impaired loans	0	785	0	832
Loans individually evaluated with specific allowance	0	0	0	0
Loans individually evaluated with no specific allowance	0	7,188	0	7,188
Loans collectively evaluated with general allowance	10,673	10,553	10,673	10,553	10,624
Total investment evaluated	$ 10,673	17,741	$ 10,673	17,741	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		1,342		1,291	1,291
Provision (reversal) for credit losses—general		(35)		16
Provision for credit losses—specific		0		0
Reversal due to sale of Business Credit				0
Loans charged off, net of recoveries		0		0
Balance, end of period		1,307		1,307
Balance, end of period—specific		0		0
Balance, end of period—general		1,307		1,307
Average balance of impaired loans and leases		0		0
Interest recognized from impaired loans		12		12
Loans individually evaluated with specific allowance		0		0
Loans individually evaluated with no specific allowance		623		623
Loans collectively evaluated with general allowance		164,611		164,611
Total investment evaluated		165,234		165,234
Equipment Finance [Member] | Leases [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Average balance of impaired loans and leases		660		723
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, L55

Loans Held-for-Sale, Loans, Leases and Allowance for Credit Losses - Summary Activity in the Allowance for Credit Losses (Parenthetical) (Detail) - USD ($) $ in Millions	Jun. 30, 2017	Jun. 30, 2016
Leveraged Finance [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Fair value of loans acquired	$ 403.1	$ 167.2

Restricted Cash - Summary of Re

Restricted Cash - Summary of Restricted Cash (Detail) - USD ($) $ in Thousands	Jun. 30, 2017	Dec. 31, 2016
Restricted Cash And Investments [Abstract]
Collections on loans pledged to credit facilities	$ 37,731	$ 43,822
Principal and interest collections on loans held in trust and prefunding amounts	185,403	216,501
Customer escrow accounts	134	2,320
Total	$ 223,268	$ 262,643

Restricted Cash - Additional In

Restricted Cash - Additional Information (Detail) $ in Millions	Jun. 30, 2017USD ($)
Restricted Cash And Investments [Abstract]
Restricted cash to fund new or existing loans	$ 155.1

Investments in Debt Securitie58

Investments in Debt Securities, Available-for-Sale - Summary of Amortized Cost of Investments in Debt Securities (Detail) - USD ($) $ in Thousands	Jun. 30, 2017	Dec. 31, 2016
Investments Debt And Equity Securities [Abstract]
Investments in debt securities—gross	$ 157,326	$ 132,180
Unamortized discount	(7,822)	(6,743)
Investments in debt securities—amortized cost	$ 149,504	$ 125,437

Investments in Debt Securitie59

Investments in Debt Securities, Available-for-Sale - Additional Information (Detail)	3 Months Ended		6 Months Ended
	Jun. 30, 2017USD ($)	Jun. 30, 2016USD ($)Segment	Jun. 30, 2017USD ($)	Jun. 30, 2016USD ($)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
Purchase of debt securities	26,100,000		29,613,000
Proceeds from debt securities, available-for-sale	5,900,000		5,919,000
Paydown of investment in debt securities			200,000
Number of debt securities purchased | Segment		0		0
Number of debt securities redeemed | Segment		0		0
Number of debt securities sold | Segment		0		0
Net OTTI	$ 0	$ 0	$ 0	$ 0

Investments in Debt Securitie60

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	Jun. 30, 2017	Dec. 31, 2016
Guarantee Obligations [Line Items]
Investments in debt securities—amortized cost	$ 149,504	$ 125,437
Gross unrealized holding gains	2,923	286
Gross unrealized holding losses	(1,001)	(6,416)
Fair value	151,426	119,307
Collateralized Loan Obligations [Member]
Guarantee Obligations [Line Items]
Investments in debt securities—amortized cost	149,504	125,437
Gross unrealized holding gains	2,923	286
Gross unrealized holding losses	(1,001)	(6,416)
Fair value	$ 151,426	$ 119,307

Investments in Debt Securitie61

Investments in Debt Securities, Available-for-Sale - Summary of Unrealized Loss on Investments (Detail) $ in Thousands	Jun. 30, 2017USD ($)Position	Dec. 31, 2016USD ($)Position
Investments Debt And Equity Securities [Abstract]
Number of positions, Less than 12 Months | Position	4	3
Fair value, Less than 12 Months	$ 9,429	$ 4,811
Amortized cost, Less than 12 Months	9,683	4,885
Unrealized loss, Less than 12 Months	$ (254)	$ (74)
Number of positions, Greater than or Equal to 12 Months | Position	4	17
Fair value, Greater than or Equal to 12 Months	$ 16,340	$ 68,737
Amortized cost, Greater than or Equal to 12 Months	17,087	75,079
Unrealized loss, Greater than or Equal to 12 Months	$ (747)	$ (6,342)
Number of positions | Position	8	20
Fair value	$ 25,769	$ 73,548
Amortized cost	26,770	79,964
Unrealized loss	$ (1,001)	$ (6,416)

Investments in Debt Securitie62

Investments in Debt Securities, Available-for-Sale - Summary of Maturities of Debt Securities (Detail) - USD ($) $ in Thousands	Jun. 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	$ 85,866	53,177
Amortized cost, Available-for-sale, Due after ten years through fifteen years	63,638	72,169
Investments in debt securities—amortized cost	149,504	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	87,344	48,404
Fair value, Available-for-sale, Due after ten years through fifteen years	64,082	70,883
Fair value	$ 151,426	$ 119,307

Borrowings - Credit Facilities

Borrowings - Credit Facilities - Additional Information (Detail)	6 Months Ended
	Jun. 30, 2017USD ($)CreditFacility	Dec. 31, 2016USD ($)
Line of Credit Facility [Line Items]
Number of credit facility | CreditFacility	2
Outstanding balance of credit facility	$ 396,139,000	$ 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	373,700,000
Unamortized deferred financing fees	$ 5,500,000
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	30,000,000
Unamortized deferred financing fees	$ 2,100,000
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	Jun. 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		$ 4,600,000

Borrowings - Subordinated Notes

Borrowings - Subordinated Notes - Additional Information (Detail) - Franklin Square [Member] - Subordinated Notes [Member] - USD ($)	Dec. 04, 2014	Jan. 31, 2016	Jun. 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			$ 50,300,000		$ 53,700,000
Unamortized deferred financing fees			$ 4,700,000
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 - 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	Jun. 30, 2017	Mar. 20, 2017	Dec. 31, 2016	Jun. 12, 2015
Debt Instrument [Line Items]
Outstanding balance on drawn notes							$ 2,097,459,000		$ 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							155,264,000
Principal collection and payments receivable of secured debt							201,500,000
Unamortized deferred financing fees							$ 300,000
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							$ 1,700,000
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							$ 2,800,000
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							$ 2,600,000
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							$ 2,200,000
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							$ 3,800,000
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								3,200,000
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

Borrowings - Summary of Borrowi

Borrowings - Summary of Borrowings (Detail) - USD ($)	Mar. 20, 2017	Jun. 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 securitizations, net		$ 2,097,459,000	$ 2,195,064,000
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		155,264,000
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 [Member] | 2012-2 CLO [Member]
Financial Instruments Owned and Pledged as Collateral [Line Items]
Notes originally issued		190,700,000
Term debt securitizations, net		$ 66,364,000
Interest rate		Libor+1.90%
Legal final maturity		Jan. 20, 2023
Class A [Member] | Two Thousand And Twelve Two Commercial Loan Trust [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]
Notes originally issued		$ 202,500,000
Term debt securitizations, net		$ 202,500,000
Interest rate		Libor+1.80%
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]
Notes originally issued		$ 256,000,000
Term debt securitizations, net		$ 256,000,000
Interest rate		Libor+1.65%
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 B | 2012-2 CLO [Member]
Financial Instruments Owned and Pledged as Collateral [Line Items]
Notes originally issued		$ 26,000,000
Term debt securitizations, net		$ 26,000,000
Interest rate		Libor+3.25%
Legal final maturity		Jan. 20, 2023
Class B | Two Thousand And Twelve Two Commercial Loan Trust [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]
Notes originally issued		$ 50,000,000
Term debt securitizations, net		$ 50,000,000
Interest rate		Libor+2.80%
Basis Spread on Variable Rate		2.80%
Legal final maturity		Jan. 20, 2027
Class B | 2015-2 CLO [Member]
Financial Instruments Owned and Pledged as Collateral [Line Items]
Notes originally issued		$ 40,000,000
Term debt securitizations, net		$ 40,000,000
Interest rate		Libor+2.90%
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]
Notes originally issued		$ 36,750,000
Term debt securitizations, net		$ 36,750,000
Interest rate		Libor+3.75%
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]
Notes originally issued		$ 48,000,000
Term debt securitizations, net		$ 48,000,000
Interest rate		Libor+2.24%
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] | 2012-2 CLO [Member]
Financial Instruments Owned and Pledged as Collateral [Line Items]
Notes originally issued		$ 35,200,000
Term debt securitizations, net		$ 35,200,000
Interest rate		Libor+4.25%
Legal final maturity		Jan. 20, 2023
Class C [Member] | Two Thousand And Twelve Two Commercial Loan Trust [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]
Notes originally issued		$ 30,250,000
Term debt securitizations, net		$ 30,250,000
Interest rate		Libor+3.60%
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]
Notes originally issued		$ 38,500,000
Term debt securitizations, net		$ 38,500,000
Interest rate		Libor+3.85%
Basis Spread on Variable Rate		3.85%
Legal final maturity		Jan. 20, 2027
Class C [Member] | 2015-2 CLO [Member]
Financial Instruments Owned and Pledged as Collateral [Line Items]
Notes originally issued		$ 26,250,000
Term debt securitizations, net		$ 26,250,000
Interest rate		Libor+3.95%
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]
Notes originally issued		$ 22,500,000
Term debt securitizations, net		$ 22,500,000
Interest rate		Libor+5.40%
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]
Notes originally issued		$ 20,000,000
Term debt securitizations, net		$ 20,000,000
Interest rate		Libor+3.00%
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 D [Member] | 2012-2 CLO [Member]
Financial Instruments Owned and Pledged as Collateral [Line Items]
Notes originally issued		$ 11,400,000
Term debt securitizations, net		$ 11,400,000
Interest rate		Libor+6.25%
Legal final maturity		Jan. 20, 2023
Class D [Member] | Two Thousand And Twelve Two Commercial Loan Trust [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]
Notes originally issued		$ 23,500,000
Term debt securitizations, net		$ 23,500,000
Interest rate		Libor+4.75%
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]
Notes originally issued		$ 33,250,000
Term debt securitizations, net		$ 33,250,000
Interest rate		Libor+5.50%
Basis Spread on Variable Rate		5.50%
Legal final maturity		Jan. 20, 2027
Class D [Member] | 2015-2 CLO [Member]
Financial Instruments Owned and Pledged as Collateral [Line Items]
Notes originally issued		$ 28,500,000
Term debt securitizations, net		$ 28,500,000
Interest rate		Libor+5.25%
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]
Notes originally issued		$ 7,500,000
Term debt securitizations, net		$ 7,500,000
Interest rate		Libor+5.50%
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]
Notes originally issued		$ 22,750,000
Term debt securitizations, net		$ 22,750,000
Interest rate		Libor+4.20%
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]
Notes originally issued		$ 16,300,000					$ 16,300,000
Term debt securitizations, net		$ 16,300,000
Interest rate		Libor+6.75%
Legal final maturity		Jan. 20, 2023
Class E [Member] | Two Thousand And Twelve Two Commercial Loan Trust [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]
Notes originally issued		$ 5,000,000
Term debt securitizations, net		$ 5,000,000
Interest rate		Libor+7.50%
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]
Notes originally issued		$ 21,000,000
Term debt securitizations, net		$ 21,000,000
Interest rate		Libor+6.95%
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]
Notes originally issued		$ 20,000,000
Term debt securitizations, net		$ 20,000,000
Interest rate		Libor+2.60%
Legal final maturity		Apr. 20, 2025
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%
CLO 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 A-1 [Member] | 2015-1 CLO [Member]
Financial Instruments Owned and Pledged as Collateral [Line Items]
Notes originally issued		$ 253,500,000
Term debt securitizations, net		$ 253,500,000
Interest rate		Libor+1.80%
Basis Spread on Variable Rate		1.80%
Legal final maturity		Jan. 20, 2027
Class A-1 [Member] | 2015-2 CLO [Member]
Financial Instruments Owned and Pledged as Collateral [Line Items]
Notes originally issued		$ 205,000,000
Term debt securitizations, net		$ 205,000,000
Interest rate		Libor+2.00%
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]
Notes originally issued		$ 176,500,000
Term debt securitizations, net		$ 176,500,000
Interest rate		Libor+2.30%
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] | 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 X [Member] | Arch Street CLO [Member]
Financial Instruments Owned and Pledged as Collateral [Line Items]
Notes originally issued		$ 2,500,000
Interest rate		Libor+1.25%
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]
Notes originally issued		$ 207,000,000
Term debt securitizations, net		$ 207,000,000
Interest rate		Libor+1.78%
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]
Notes originally issued		$ 25,000,000
Interest rate		Libor+1.78%
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]
Notes originally issued		$ 40,000,000
Term debt securitizations, net		$ 40,000,000
Interest rate		Libor+2.50%
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]
Notes originally issued		$ 32,000,000
Term debt securitizations, net		$ 32,000,000
Interest rate		Libor+3.50%
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]
Notes originally issued		$ 24,000,000
Term debt securitizations, net		$ 24,000,000
Interest rate		Libor+5.10%
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%

Repurchase Agreements - Additio

Repurchase Agreements - Additional Information (Detail)	Jun. 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	49,100,000
JP Morgan Chase Bank [Member]
Assets Sold under Agreements to Repurchase [Line Items]
Repurchase agreements, outstanding at end of period	28,300,000
Natixis Securities Americas LLC [Member]
Assets Sold under Agreements to Repurchase [Line Items]
Repurchase agreements, outstanding at end of period	$ 1,800,000

Stockholders' Equity - Schedule

Stockholders' Equity - Schedule of Authorized Capital (Detail) - shares	Jun. 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	41,758,435	42,820,198

Stockholders' Equity - Addition

Stockholders' Equity - Additional Information (Detail)	Jun. 15, 2017$ / shares	May 02, 2017	Dec. 09, 2016USD ($)	Jun. 30, 2017USD ($)$ / sharesshares	Jun. 30, 2016USD ($)	Jun. 30, 2017USD ($)Installment$ / sharesshares	Jun. 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						1,438,376
Common stock, cash dividend paid per share | $ / shares	$ 0.02
Date of payment of cash dividend to stockholders		Jun. 15, 2017
Date of record of cash dividend paid to stockholders		May 30, 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	$ 900,000	$ 1,700,000	$ 1,900,000
Unrecognized compensation cost | $				$ 3,900,000		$ 3,900,000
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						$ 10.04
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 - Schedu71

Stockholders' Equity - Schedule of Restricted Stock Activity (Detail) - Restricted Stock [Member] $ in Thousands	6 Months Ended
	Jun. 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	(382,641)
Shares, Forfeited | shares	(2,543)
Shares, Non-vested, Ending balance | shares	796,589
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 | $	(3,184)
Weighted average grant-date fair value, Forfeited | $	(25)
Weighted average grant-date fair value, Non-vested, Ending balance | $	$ 6,705

Stockholders' Equity - Schedu72

Stockholders' Equity - Schedule of Stock Option Activity (Detail)	6 Months Ended
	Jun. 30, 2017shares
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]
Options Outstanding, Beginning balance	421,692
Options Exercised	(251,692)
Options Forfeited	(10,000)
Options Outstanding, Ending Balance	160,000
Options Vested and exercisable as of June 30, 2017	160,000

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		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Dilutive and Antidilutive Securities Associated with Computation of Earnings Per Share [Line Items]
Net income	$ 4,152	$ 5,241	$ 5,534	$ 9,250
Net income allocated to participating securities - basic and diluted	79	94	104	151
Net income allocated to common shareholders - basic and diluted	$ 4,073	$ 5,147	$ 5,430	$ 9,099
Denominator for basic earnings per common share	41,225	46,011	41,512	46,157
Total weighted average diluted shares	41,250	46,011	41,541	46,157
Basic	$ 0.10	$ 0.11	$ 0.13	$ 0.20
Diluted	$ 0.10	$ 0.11	$ 0.13	$ 0.20
Options [Member]
Dilutive and Antidilutive Securities Associated with Computation of Earnings Per Share [Line Items]
Potentially dilutive securities-options (in shares)	25		29

Earnings Per Share - Additional

Earnings Per Share - Additional Information (Detail) - shares	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 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				806,519

Variable Interest Entities - Ad

Variable Interest Entities - Additional Information (Detail) $ in Millions	Apr. 18, 2017USD ($)	Nov. 30, 2016USD ($)	Jan. 31, 2015USD ($)	Jun. 30, 2017	Oct. 31, 2015LoansFund
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
Each class of note securitization amount, total		$ 25.3
Percentage of each class of note securitization		5.00%
NewStar Clarendon Fund CLO LLC [Member]
Variable Interest Entity [Line Items]
Term debt securitization			$ 400
Each class of note securitization amount, total			$ 20.4
Percentage of each class of note securitization			5.00%
Longfellow Fund [Member]
Variable Interest Entity [Line Items]
Term debt securitization	$ 516.9
Each class of note securitization amount, total	$ 27.5
Percentage of each class of note securitization	5.00%

Variable Interest Entities - Un

Variable Interest Entities - Unconsolidated Variable Interest Entities (Details) - USD ($)	Jun. 30, 2017	Dec. 31, 2016
Organization Consolidation And Presentation Of Financial Statements [Abstract]
Unconsolidated VIE assets	$ 1,423,263,000	$ 912,900,000
Unconsolidated VIE liabilities	831,527,000	810,030,000
Equity interest included on the Consolidated Balance Sheet	54,381,000	50,386,000
Maximum risk of loss	$ 55,223,000	$ 50,794,000

Financial Instruments with Of77

Financial Instruments with Off-Balance Sheet Risk - Financial Instruments with Off-Balance Sheet Risk (Detail) - USD ($) $ in Thousands	Jun. 30, 2017	Dec. 31, 2016
Unused Lines of Credit [Member]
Concentration Risk [Line Items]
Financial instruments with off-balance sheet risk	$ 306,113	$ 326,051
Standby Letters of Credit [Member]
Concentration Risk [Line Items]
Financial instruments with off-balance sheet risk	$ 6,825	$ 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	Jun. 30, 2017	Dec. 31, 2016	Jun. 30, 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		$ 11,900,000
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	Jun. 30, 2017	Dec. 31, 2016
Derivative [Line Items]
Accrued interest payable		$ (20,230)	$ (21,319)
TRS receivable		$ 13,536	$ 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		6 Months Ended		12 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016	Dec. 31, 2016
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loss from change in fair value	$ 3,200		$ 6,000
Gain (loss) on sale of loans, net	511	$ 162	1,207	$ 55
Assets fair value write down expenses			0		$ 300
Non-public investments carrying value within other assets	18,500		18,500		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]
Gain (loss) on sale of loans, net	$ 10		$ 200		$ 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	Jun. 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	$ 151,426	$ 119,307
Loans	2,633,032	2,838,165
Loans held-for-sale	354,242	145,406
Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans held-for-sale	145,676	69,875
Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans	2,633,032	2,838,165
Loans held-for-sale	208,566	75,531
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	151,426	119,307
Loans	403,129	403,745
Total assets recorded at fair value on a recurring basis	554,555	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	403,129	403,745
Total assets recorded at fair value on a recurring basis	403,129	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	151,426	119,307
Total assets recorded at fair value on a recurring basis	151,426	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	33,107	6,924
Other real estate owned/repossessed assets	15,632	15,750
Total assets recorded at fair value on a nonrecurring basis	48,739	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	26,032	4,465
Total assets recorded at fair value on a nonrecurring basis	26,032	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	7,075	2,459
Other real estate owned/repossessed assets	15,632	15,750
Total assets recorded at fair value on a nonrecurring basis	$ 22,707	$ 18,209

Fair Value - Summary of Signifi

Fair Value - Summary of Significant Unobservable Inputs and Valuation Techniques (Detail) - USD ($) $ in Thousands	6 Months Ended	12 Months Ended
	Jun. 30, 2017	Dec. 31, 2016	Mar. 31, 2017	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Fair value financial assets	$ 174,133	$ 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	$ 7,075	$ 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	$ 15,632	$ 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	$ 151,426	$ 119,307	$ 127,543	$ 91,400	$ 89,687	$ 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		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 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	$ 174,133		174,133
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	127,543	$ 89,687	119,307	$ 94,177
Included in earnings	279	137	384	313
Included in other comprehensive income (loss)	3,498	1,576	8,041	(3,090)
Purchases	26,005		29,613
Issuances
Settlements	(5,899)		(5,919)
Investment in Debt Securities - Available for sale, ending balance	$ 151,426	$ 91,400	$ 151,426	$ 91,400

Fair Value - Carrying Amounts a

Fair Value - Carrying Amounts and Estimated Fair Values of Company's Financial Instruments (Detail) - USD ($) $ in Thousands	Jun. 30, 2017	Dec. 31, 2016	Jun. 30, 2016	Dec. 31, 2015
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and cash equivalents	$ 49,721	$ 154,480	$ 34,634	$ 35,933
Restricted cash	223,268	262,643
Cash collateral on deposit with custodians	7,564	7,564
Investments in debt securities, available-for-sale	151,426	119,307
Loans held-for-sale, net	346,626	144,060
Loans and leases, net	3,037,363	3,239,191
Other assets, Carrying amount	18,453	15,954
Credit facilities, net	396,139	445,493
Term debt securitizations, net	2,097,459	2,195,064
Senior notes, net	374,830	373,919
Subordinated notes, net	245,082	241,390
Repurchase agreements, net	79,269	55,046
Other liabilities, Carrying amount	1,000	1,350
Loans held-for-sale, net, Fair value	354,242	145,406
Loans, net	2,633,032	2,838,165
Other assets, Fair value	18,453	15,954
Credit facilities, net, Fair value	396,139	445,493
Term debt securitizations, net, Fair value	2,169,976	2,230,102
Senior notes, net, Fair value	388,778	380,000
Subordinated notes, net, Fair value	316,821	303,916
Repurchase agreements, net, Fair value	79,269	55,046
Other liabilities, Fair value	1,000	1,350
Consolidated Entities [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and cash equivalents	49,721	154,480
Restricted cash	223,268	262,643
Cash collateral on deposit with custodians	7,564	7,564
Investments in debt securities, available-for-sale	151,426	119,307
Loans held-for-sale, net	346,626	144,060
Loans and leases, net	3,037,363	3,239,191
Other assets, Carrying amount	18,453	15,954
Credit facilities, net	396,139	445,493
Term debt securitizations, net	2,097,459	2,195,064
Senior notes, net	374,830	373,919
Subordinated notes, net	245,082	241,390
Repurchase agreements, net	79,269	55,046
Other liabilities, Carrying amount	1,000	1,350
Cash and cash equivalents, Fair value	49,721	154,480
Restricted cash, Fair value	223,268	262,643
Cash collateral on deposit with custodians, Fair value	7,564	7,564
Loans held-for-sale, net, Fair value	354,242	145,406
Loans, net	3,036,161	3,241,910
Other assets, Fair value	18,453	15,954
Credit facilities, net, Fair value	396,139	445,493
Term debt securitizations, net, Fair value	2,169,976	2,230,102
Senior notes, net, Fair value	388,778	380,000
Subordinated notes, net, Fair value	316,821	303,916
Repurchase agreements, net, Fair value	79,269	55,046
Other liabilities, Fair value	$ 1,000	$ 1,350

Fair Value - Carrying Amounts,

Fair Value - Carrying Amounts, Estimated Fair Values and Placement in Fair Value Hierarchy of Financial Instruments (Detail) - USD ($) $ in Thousands	Jun. 30, 2017	Dec. 31, 2016
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans and leases, net	$ 3,037,363	$ 3,239,191
Loans held-for-sale, net	346,626	144,060
Other assets, Carrying amount	18,453	15,954
Credit facilities, net	396,139	445,493
Term debt securitizations, net	2,097,459	2,195,064
Repurchase agreements, net	79,269	55,046
Senior notes, net	374,830	373,919
Subordinated notes, net	245,082	241,390
Other liabilities, Carrying amount	1,000	1,350
Loans, net	2,633,032	2,838,165
Loans held-for-sale, net, Fair value	354,242	145,406
Other assets, Fair value	18,453	15,954
Credit facilities, net, Fair value	396,139	445,493
Term debt securitizations, net, Fair value	2,169,976	2,230,102
Repurchase agreements, net, Fair value	79,269	55,046
Senior notes, net, Fair value	388,778	380,000
Subordinated notes, net, Fair value	316,821	303,916
Other liabilities, Fair value	1,000	1,350
Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans held-for-sale, net, Fair value	145,676	69,875
Credit facilities, net, Fair value	396,139	445,493
Term debt securitizations, net, Fair value	2,169,976	2,230,102
Repurchase agreements, net, Fair value	79,269	55,046
Senior notes, net, Fair value	388,778	380,000
Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans, net	2,633,032	2,838,165
Loans held-for-sale, net, Fair value	208,566	75,531
Other assets, Fair value	18,453	15,954
Subordinated notes, net, Fair value	316,821	303,916
Other liabilities, Fair value	1,000	1,350
Loans Receivable Excluding Real Estate Loans With Negative Credit Mark [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans and leases, net	$ 2,634,234	$ 2,835,446

Fair Value - Carrying Amounts86

Fair Value - Carrying Amounts, Estimated Fair Values and Placement in Fair Value Hierarchy of Financial Instruments (Parenthetical) (Detail) - USD ($) $ in Thousands	Jun. 30, 2017	Dec. 31, 2016
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans held at fair value	$ 2,633,032	$ 2,838,165
Adjustment [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans held at fair value		$ (403,700)

Segment Reporting - Additional

Segment Reporting - Additional Information (Detail)	6 Months Ended
	Jun. 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				6 Months Ended
		Jun. 30, 2017		Jun. 30, 2016		Jun. 30, 2017		Jun. 30, 2016		Dec. 31, 2016
Segment Reporting Information [Line Items]
Net interest income:		$ 15,008		$ 20,906		$ 28,996		$ 43,425
Provision for loan losses		2,698		3,623		8,847		21,336
Net interest income after provision		12,310		17,283		20,149		22,089
Noninterest income:
Management fees		2,827		3,096		6,128		6,143
Performance fees		999		447		1,345		841
Other lending fees		2,161		1,697		5,354		2,890
Gain/(loss) on sale of loans and equipment		511		492		1,207		607
Other noninterest income		(1,319)	[1]	(1,373)	[2]	(2,704)	[1]	13,030	[1]
Total noninterest income:		5,179		4,359		11,330		23,511
Non-interest expense		10,299		12,840		21,936		29,908
Income before income taxes		7,190		8,802		9,543		15,692
Income tax expense		3,038		3,561		4,009		6,442
Net income		4,152		5,241		5,534		9,250
Gross loans		3,110,073				3,110,073				$ 3,319,550
Loans held-for-sale, gross		349,757				349,757				145,966
Investments in debt securities, available-for-sale		151,426				151,426				119,307
Other		320,139				320,139				455,769
Total assets		3,931,395				3,931,395				4,040,592
Illiquid Credit funds	[3]	1,317,552				1,317,552				1,314,690
Liquid/Tradeable Credit	[3]	1,584,783				1,584,783				1,833,607
Total Assets		6,833,730				6,833,730				7,188,889
Non Managed assets	[4]	312,318				312,318				449,026
Total Managed Assets		6,521,412				6,521,412				6,739,863
Commercial Lending Segment [Member]
Segment Reporting Information [Line Items]
Net interest income:		13,786		19,760		26,641		41,617
Provision for loan losses		2,698		3,623		8,847		21,336
Net interest income after provision		11,088		16,137		17,794		20,281
Noninterest income:
Other lending fees		2,129		1,665		5,269		2,858
Gain/(loss) on sale of loans and equipment		127		347		219		462
Other noninterest income		1,898	[1]	(1,755)	[2]	3,309	[1]	12,760	[1]
Total noninterest income:		4,154		257		8,797		16,080
Non-interest expense		8,377		10,359		17,858		25,194
Income before income taxes		6,865		6,035		8,733		11,167
Gross loans		2,706,944				2,706,944				2,915,805
Loans held-for-sale, gross		349,757				349,757				145,966
Other		236,631				236,631				374,851
Total assets		3,293,332				3,293,332				3,436,622
Total Assets		3,293,332				3,293,332				3,436,622
Non Managed assets	[4]	236,631				236,631				374,851
Total Managed Assets		3,056,701				3,056,701				3,061,771
Asset Management Segment [Member]
Segment Reporting Information [Line Items]
Net interest income:		1,222		1,146		2,355		1,808
Net interest income after provision		1,222		1,146		2,355		1,808
Noninterest income:
Management fees		2,827		3,096		6,128		6,143
Performance fees		999		447		1,345		841
Other lending fees		32		32		85		32
Gain/(loss) on sale of loans and equipment		384		145		988		145
Other noninterest income		(3,217)	[1]	382	[2]	(6,013)	[1]	270	[1]
Total noninterest income:		1,025		4,102		2,533		7,431
Non-interest expense		1,922		2,481		4,078		4,714
Income before income taxes		325		$ 2,767		810		$ 4,525
Gross loans		403,129				403,129				403,745
Investments in debt securities, available-for-sale		151,426				151,426				119,307
Other		83,508				83,508				80,918
Total assets		638,063				638,063				603,970
Illiquid Credit funds	[3]	1,317,552				1,317,552				1,314,690
Liquid/Tradeable Credit	[3]	1,584,783				1,584,783				1,833,607
Total Assets		3,540,398				3,540,398				3,752,267
Non Managed assets	[4]	75,687				75,687				74,175
Total Managed Assets		$ 3,464,711				$ 3,464,711				$ 3,678,092
[1]	(1)Includes fair value adjustments on Loans held-for-sale and fair value portfolio.
[2]	(1)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 o89

Segment Reporting - Summary of Total Assets and Statement of Operations (Parenthetical) (Detail) - USD ($) $ in Thousands	Jun. 30, 2017	Dec. 31, 2016
Segment Reporting Information [Line Items]
Loans at fair value	$ 2,633,032	$ 2,838,165
Commercial Lending and Asset Management [Member]
Segment Reporting Information [Line Items]
Loans at fair value	$ 403,129	$ 403,745

Related-Party Transactions - Ad

Related-Party Transactions - Additional Information (Detail) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016	Apr. 18, 2017	Nov. 29, 2016	Jan. 15, 2015
Related Party Transaction [Line Items]
Asset management income	$ 3,826,000	$ 3,543,000	$ 7,473,000	$ 6,984,000
NewStar Credit Opportunities Fund, Ltd. [Member] | Investment Management Agreement [Member]
Related Party Transaction [Line Items]
Asset management income	50,000	0	90,000	40,000
Arlington Program [Member] | Collateral Management Agreement [Member]
Related Party Transaction [Line Items]
Revenue receivable from transactions with related party	500,000	500,000	1,000,000	1,000,000
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	1,000,000	1,000,000
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	400,000		1,100,000
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	$ 300,000	$ 400,000	$ 1,000,000	$ 800,000
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

Subsequent Events - Additional

Subsequent Events - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Millions	Jul. 31, 2017	Jul. 20, 2017	May 02, 2017
Subsequent Event [Line Items]
Cash dividend payable, date declared			Jun. 15, 2017
Cash dividend payable, date of record			May 30, 2017
Subsequent Event [Member]
Subsequent Event [Line Items]
Cash dividend payable, date declared	Jul. 31, 2017
Cash dividend payable per share	$ 0.02
Cash dividend payable, date to be paid	Sep. 15, 2017
Cash dividend payable, date of record	Aug. 29, 2017
Subsequent Event [Member] | Fifth Street CLO Management LLC [Member]
Subsequent Event [Line Items]
Business acquisition date		Jul. 20, 2017
Business acquisition purchase price		$ 16.1
Business acquisition assumed indebtedness		13
Business acquisition assumed assets		$ 725