Heritage Insurance (HRTG) 10-Q 6 Nov 18 2018 Q3 Quarterly report Financial data

Document and Entity Information

Document and Entity Information - shares	9 Months Ended
	Sep. 30, 2018	Nov. 02, 2018
Document And Entity Information [Abstract]
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Sep. 30, 2018
Document Fiscal Year Focus	2,018
Document Fiscal Period Focus	Q3
Trading Symbol	HRTG
Entity Registrant Name	HERITAGE INSURANCE HOLDINGS, INC.
Entity Central Index Key	1,598,665
Current Fiscal Year End Date	--12-31
Entity Filer Category	Accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	true
Entity Ex Transition Period	true
Entity Common Stock, Shares Outstanding		26,600,605

Condensed Consolidated Balance

Condensed Consolidated Balance Sheets - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017
ASSETS
Fixed maturity securities, available for sale, at fair value (amortized cost of $528,139 and $552,458 in 2018 and 2017, respectively)	$ 515,541	$ 549,796
Equity securities, available for sale, at fair value (cost of $16,906 and $17,548 in 2018 and 2017, respectively)	15,709	17,217
Total investments	531,250	567,013
Cash and cash equivalents	221,524	153,697
Restricted cash	12,250	20,833
Accrued investment income	3,753	5,057
Premiums receivable, net	68,621	67,757
Reinsurance recoverable on paid and unpaid claims	324,826	357,357
Prepaid reinsurance premiums	282,649	227,764
Income taxes receivable	36,249	37,338
Deferred policy acquisition costs, net	75,702	41,678
Property and equipment, net	18,480	18,748
Intangibles, net	81,911	101,626
Goodwill	152,459	152,459
Other assets	15,653	19,883
Total Assets	1,825,327	1,771,210
LIABILITIES AND STOCKHOLDERS' EQUITY
Unpaid losses and loss adjustment expenses	421,095	470,083
Unearned premiums	484,680	475,334
Reinsurance payable	217,022	17,577
Long-term debt, net	178,330	184,405
Deferred income tax	11,963	34,333
Advance premiums	33,435	23,648
Accrued compensation	10,486	16,477
Accounts payable and other liabilities	77,760	169,537
Total Liabilities	1,434,771	1,391,394
Commitments and contingencies (Note 16)
Stockholders’ Equity:
Common stock, $0.0001 par value, 50,000,000 shares authorized, 26,569,804 shares issued and 25,769,804 outstanding at September 30, 2018 and 26,560,004 shares issued and 25,885,004 outstanding at December 31, 2017	3	3
Additional paid-in capital	295,500	294,836
Accumulated other comprehensive loss	(9,583)	(3,064)
Treasury stock, at cost, 7,214,797 shares at September 30, 2018 and 7,099,597 shares at December 31, 2017	(89,185)	(87,185)
Retained earnings	193,821	175,226
Total Stockholders' Equity	390,556	379,816
Total Liabilities and Stockholders' Equity	$ 1,825,327	$ 1,771,210

Condensed Consolidated Balanc_2

Condensed Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017
Statement Of Financial Position [Abstract]
Fixed maturities available for sale, at amortized cost	$ 528,139	$ 552,458
Equity securities, cost	$ 16,906	$ 17,548
Common stock, par value	$ 0.0001	$ 0.0001
Common stock, shares authorized	50,000,000	50,000,000
Common stock, shares issued	26,569,804	26,560,004
Common stock, shares outstanding	25,769,804	25,885,004
Treasury stock, shares	7,214,797	7,099,597

Condensed Consolidated Statemen

Condensed Consolidated Statements of Income and Other Comprehensive Income (Loss) (Unaudited) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
REVENUES:
Gross premiums written	$ 233,613	$ 154,355	$ 701,643	$ 455,845
Change in gross unearned premiums	551	(1,292)	(9,345)	4,180
Gross premiums earned	234,164	153,063	692,298	460,025
Ceded premiums	(115,926)	(57,855)	(356,748)	(182,189)
Net premiums earned	118,238	95,208	335,550	277,836
Net investment income	3,847	2,735	9,704	8,210
Net realized gains (losses)	5	365	(307)	1,011
Other revenue	3,205	3,466	10,346	10,948
Total revenues	125,295	101,774	355,293	298,005
EXPENSES:
Losses and loss adjustment expenses	58,695	64,035	177,775	156,728
Policy acquisition costs, net of ceding commission income for the three and nine months ended September 30, 2018, of $13,781 and $42,097 respectively	26,569	20,906	58,167	66,086
General and administrative expenses, net of ceding commission income for the three and nine months ended September 30, 2018, of $4,526 and $13,772 respectively	25,815	15,420	72,167	48,826
Total expenses	111,079	100,361	308,109	271,640
Operating income	14,216	1,413	47,184	26,365
Interest expense, net	5,225	3,751	15,431	8,163
Other non-operating income, net		6,883	(542)	6,883
Income (loss) before income taxes	8,991	(9,221)	32,295	11,319
Provision for income taxes	3,002	(525)	9,068	7,390
Net income (loss)	5,989	(8,696)	23,227	3,929
OTHER COMPREHENSIVE (LOSS) INCOME
Change in net unrealized (losses) gains on investments	(2,895)	593	(9,918)	8,473
Reclassification adjustment for net realized investment (gains) losses	(5)	(365)	307	(1,011)
Income tax (expense) benefit related to items of other comprehensive income	1,665	(81)	3,249	(2,866)
Total comprehensive (loss) income	$ 4,754	$ (8,549)	$ 16,865	$ 8,525
Weighted average shares outstanding
Basic	25,631,871	25,883,267	25,663,415	27,647,146
Diluted	26,046,938	25,883,267	26,340,759	27,647,146
Earnings (loss) per share
Basic	$ 0.23	$ (0.34)	$ 0.91	$ 0.14
Diluted	$ 0.23	$ (0.34)	$ 0.88	$ 0.14

Condensed Consolidated Statem_2

Condensed Consolidated Statements of Income and Other Comprehensive Income (Loss) (Parenthetical) (Unaudited) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
	Sep. 30, 2018	Sep. 30, 2018
Ceding commission income	$ 18,307	$ 55,869
Policy Acquisition Costs [Member]
Ceding commission income	13,781	42,097
General and Administrative Expenses [Member]
Ceding commission income	$ 4,526	$ 13,772

Condensed Consolidated Statem_3

Condensed Consolidated Statements of Stockholders' Equity (Unaudited) - USD ($) $ in Thousands	Total	Common Shares [Member]	Additional Paid-In Capital [Member]	Retained Earnings [Member]	Treasury Shares [Member]	Accumulated Other Comprehensive Loss [Member]
Beginning Balance at Dec. 31, 2016	$ 357,959	$ 3	$ 205,727	$ 182,809	$ (25,562)	$ (5,018)
Beginning Balance, Shares at Dec. 31, 2016		28,840,443
Stock buy-back	(61,624)	$ (1)			(61,623)
Stock buy-back, Shares		(5,340,267)
Stock-based compensation	3,611		3,611
Dividends declared on common stock	(6,790)			(6,790)
Net unrealized change in investments, net of tax	4,596					4,596
Net income	3,929			3,929
Ending balance at Sep. 30, 2017	301,681	$ 2	209,338	179,948	(87,185)	(422)
Ending balance, Shares at Sep. 30, 2017		23,500,176
Beginning Balance at Dec. 31, 2016	357,959	$ 3	205,727	182,809	(25,562)	(5,018)
Beginning Balance, Shares at Dec. 31, 2016		28,840,443
Stock buy-back	(47,000)
Ending balance at Dec. 31, 2017	379,816	$ 3	294,836	175,226	(87,185)	(3,064)
Ending balance, Shares at Dec. 31, 2017		25,885,004
Cumulative effect of change in accounting principle (ASU 2016-01), net of tax at Dec. 31, 2017				(267)		267
Balance at December 31, 2017, as adjusted at Dec. 31, 2017	379,816	$ 3	294,836	174,959	(87,185)	(2,797)
Stock buy-back	(2,000)				(2,000)
Stock buy-back, Shares		(115,200)
Stock-based compensation	3,929		3,929
Convertible Option debt extinguishment, net of tax	(4,235)		(4,235)
Reclassification of income taxes upon early adoption of ASU 2018-02				424		(424)
Tax effect of warrant reclassification	970		970
Dividends declared on common stock	(4,789)			(4,789)
Net unrealized change in investments, net of tax	(6,362)					(6,362)
Net income	23,227			23,227
Ending balance at Sep. 30, 2018	$ 390,556	$ 3	$ 295,500	$ 193,821	$ (89,185)	$ (9,583)
Ending balance, Shares at Sep. 30, 2018		25,769,804

Condensed Consolidated Statem_4

Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017
OPERATING ACTIVITIES
Net income	$ 23,227	$ 3,929
Adjustments to reconcile net income to net cash (used in) provided by operating activities:
Stock-based compensation	3,929	3,611
Bond amortization and accretion	4,935	6,810
Amortization of original issuance discount on debt	3,188
Depreciation and amortization	21,408	5,904
Allowance for doubtful accounts	4,468
Net realized gains (losses)	307	(1,011)
Change in fair value of long-term debt conversion feature		6,883
Net gain on repurchase of debt	(542)
Deferred income taxes	(17,301)	(1,376)
Changes in operating assets and liabilities:
Accrued investment income	1,304	129
Premiums receivable, net	(1,332)	7,394
Prepaid reinsurance premiums	(54,885)	(47,346)
Reinsurance premiums receivable and recoverable	32,531	(370,751)
Income taxes receivable	1,089	9,064
Deferred policy acquisition costs, net	(34,024)	891
Other assets	230	(7,332)
Unpaid losses and loss adjustment expenses	(48,988)	349,443
Unearned premiums	9,346	(4,180)
Reinsurance payable	199,445	61,455
Funds held by company under reinsurance treaties		61,732
Accrued interest	(757)	(1,363)
Accrued compensation	(5,991)	2,652
Advance premiums	9,787	1,832
Other liabilities	(91,031)	9,276
Net cash provided by operating activities	60,343	97,646
INVESTING ACTIVITIES
Proceeds from sales and maturities of investments available for sale	232,666	96,467
Purchases of investments available for sale	(212,107)	(11,702)
Cost of property and equipment acquired	(1,425)	(195)
Net cash provided by investing activities	19,134	84,570
FINANCING ACTIVITIES
Proceeds from issuance of secured convertible debt		136,750
Debt issuance costs		(5,105)
Mortgage loan payments	(196)
Repurchase of convertible note	(13,248)
Purchase of treasury stock	(2,000)	(61,624)
Cash dividends paid	(4,789)	(6,790)
Net cash (used in) provided by financing activities	(20,233)	63,231
Increase in cash, cash equivalents, and restricted cash	59,244	245,447
Cash, cash equivalents and restricted cash, beginning of period	174,530	126,727
Cash, cash equivalents and restricted cash, end of period	233,774	372,174
SUPPLEMENTAL DISCLOSURE OF CASH FLOW INFORMATION
Income taxes paid	25,267
Interest paid	$ 14,265	$ 5,969

Condensed Consolidated Statem_5

Condensed Consolidated Statements of Cash Flows (Parenthetical) (Unaudited) - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017	Sep. 30, 2017	Dec. 31, 2016
Statement Of Cash Flows [Abstract]
Cash and cash equivalents	$ 221,524	$ 153,697
Restricted cash	12,250	20,833
Total cash, cash equivalents and restricted cash shown in the condensed consolidated statements of cash flows	$ 233,774	$ 174,530	$ 372,174	$ 126,727

Basis of Presentation and Signi

Basis of Presentation and Significant Accounting Policies	9 Months Ended
	Sep. 30, 2018
Organization Consolidation And Presentation Of Financial Statements [Abstract]
Basis of Presentation and Significant Accounting Policies	NOTE 1. BASIS OF PRESENTATION AND SIGNIFICANT ACCOUNTING POLICIES Basis of Presentation The condensed consolidated financial statements as of and for the three and nine months ended September 30, 2018 and 2017 include Heritage Insurance Holdings, Inc. (“Parent Company”); its property and casualty insurance subsidiaries: Heritage Property & Casualty Insurance Company (“Heritage P&C”), Narragansett Bay Insurance Company (“NBIC”) and Zephyr Insurance Company, Inc. (“Zephyr”); Heritage MGA, LLC, (“HMGA”), the managing general agent that manages substantially all aspects of our Florida insurance subsidiary’s business; Contractors’ Alliance Network, LLC (“CAN”), our claims vendor network manager for Florida that provides restoration, emergency and recovery services; Skye Lane Properties, LLC, our property management subsidiary; First Access Insurance Group, LLC, our retail agency and licensed reinsurance intermediary; Osprey Re Ltd. (“Osprey”), our reinsurance subsidiary that may provide a portion of the reinsurance protection purchased by our insurance subsidiaries; and Heritage Insurance Claims, LLC, an inactive subsidiary reserved for future development. Through our insurance subsidiaries, Heritage P&C, Zephyr and NBIC, we write personal residential insurance for single-family homeowners and condominium owners, and rental property insurance in the states of Alabama, Connecticut, Florida, Georgia, Hawaii, Massachusetts, New Jersey, New York, North Carolina, Rhode Island and South Carolina. We also provide commercial residential insurance for Florida properties and are also licensed in the states of Maryland, Mississippi, Pennsylvania and Virginia. We are vertically integrated and control or manage substantially all aspects of insurance underwriting, customer service, actuarial analysis, distribution and claims processing and adjusting. The condensed consolidated financial information included herein as of and for the three and nine months ended September 30, 2018 and 2017 does not include all of the information and footnotes required by U.S. generally accepted accounting principles (“GAAP”) for complete financial statements. However, such information reflects all adjustments consisting of normal recurring accruals which are, in the opinion of management, necessary for a fair statement of the financial condition and results of operations for the interim periods. The results for the three and nine months ended September 30, 2018 and 2017 are not indicative of annual results. The accompanying unaudited condensed consolidated financial statements have been prepared in accordance with generally accepted accounting principles for interim financial information and with the instructions to Form 10-Q and Article 10 of Regulation S-X. The December 31, 2017 consolidated balance sheet was derived from the Company’s audited consolidated financial statements as of and for the year ended December 31, 2017. For further information, refer to the consolidated financial statements and footnotes thereto included in Heritage Insurance Holdings, Inc.’s Annual Report on Form 10-K for the fiscal year ended December 31, 2017 (the “2017 Form 10-K”). References to “we”, “us”, “our”, or the “Company” refer to Heritage Insurance Holdings, Inc. and its consolidated subsidiaries. Changes to significant accounting policies We have made no material changes to our significant accounting policies as reported in our Annual Report on Form 10-K for the year ended December 31, 2017. Reclassification We have reclassified certain amounts in the 2017 statement of operations to conform to our 2018 presentation. Additionally, we reclassified certain amounts in the 2017 consolidated statement of cash flows to conform to the 2018 presentation, relating to the presentation of restricted cash and cash equivalents. This reclassification is a result of our adoption of Accounting Standards Update (ASU) 2016-18, Restricted Cash effective January 1, 2018. Recently Adopted Accounting Pronouncements In February 2018, the FASB issued ASU 2018-02, Income Statement – Reporting Comprehensive Income (Topic 220) The Company early adopted the updated guidance effective January 1, 2018 and elected to reclassify the stranded income tax effects relating to the reduction in the federal corporate income tax rate from AOCI”) to retained earnings at the beginning of the period of adoption. The net impact of the accounting change resulted in a $0.4 million decrease in AOCI comprised of income taxes associated with net unrealized losses on investments and a corresponding increase in retained earnings. In May 2017, the FASB issued ASU No. 2017-09, Compensation–Stock Compensation (Topic 718): Scope of Modification Accounting In January 2017, the FASB issued ASU No. 2017-01, Business Combinations (Topic 805). Clarifying the Definition of a Business, In August 2016, the FASB issued ASU 2016-15, Classification of Certain Cash Receipts and Cash Payments In November 2016, the FASB issued ASU 2016-18, Statement of Cash Flows, In January 2016, the FASB issued ASU 2016-01, Recognition and Measurement of Financial Assets and Financial Liabilities. Technical Corrections and Improvements to Financial Instruments—Overall In May 2014, the FASB issued ASU Topic 2014-09, Revenue from Contracts with Customers Accounting Pronouncements Not Yet Adopted The Company describes below recent pronouncements that may have a significant effect on its consolidated financial statements or on its disclosures upon future adoption. The Company does not discuss recent pronouncements that are not anticipated to have an impact on, or are unrelated to, its financial condition, results of operations, or related disclosures. In August 2018, the FASB issued ASU 2018-12 , Financial Services – Insurance (Topic 944) Targeted Improvements to the Accounting for Long-Duration Contracts In March 2018, the FASB issued ASU 2018-04, Investments-Debt Securities (Topic 320) and Regulated Operations (Topic 980). Investments-Debt Securities Regulated Operations In January 2017, the FASB issued ASU No. 2017-04, Intangibles-Goodwill and Other In June 2016, the FASB issued ASU 2016-13, Financial Instruments – Credit Losses Measurement of Credit Losses on Financial Instruments In February 2016, the FASB issued ASU 2016-02 (as subsequently amended by ASU 2018 - 01, ASU 2018 - 10 and ASU 2018 - 11) Lease Accounting, requires that a lessee recognize in the statement of financial position a liability to make lease payments (the lease liability) and a right-of-use asset representing its right to use the underlying asset for the lease term. For leases with a term of 12 months or less, a lessee is permitted to make an accounting policy election by class of underlying asset not to recognize lease assets and lease liabilities. As with previous guidance, there continues to be a differentiation between finance leases and operating leases, however this distinction now primarily relates to differences in the manner of expense recognition over time and in the classification of lease payments in the statement of cash flows. Lease assets and liabilities arising from both finance and operating leases will be recognized in the statement of financial position. ASU 2016 - 02 leaves the accounting for leases by lessors largely unchanged from previous GAAP. The transitional guidance for adopting the requirements of ASU 2016 - 02 calls for a modified retrospective approach that includes a number of optional practical expedients that entities may elect to apply. In addition, ASU 2018 - 11 provides for an additional (and optional) transition method by which entities may elect to initially apply the transition requirements in Topic 842 at that Topic’s effective date with the effects of initially applying Topic 842 recognized as a cumulative effect adjustment to the opening balance of retained earnings in the period of adoption and without retrospective application to any comparative prior periods presented. To date, we have taken an inventory of all our operating leases, which consist primarily of auto, equipment and real estate owned and unowned by the Company, started our review of key lease agreements, including contract review for embedded leases, and are currently evaluating lease terms, lease payments and appropriate discount rates to use in calculating the right-to-use asset and lease liability. At September 30, 2018, the Company estimated its lease obligations subject to the new accounting guidance to be in aggregate of $5.2 million with lease terms ranging from 5 to 10 years. In addition, we are currently evaluating the transition package of practical expedients permitted within the new standard, which among other things, allows us to use hindsight to determine the reasonably certain lease term for existing leases, and allows for the adoption of the new standard at the effective date without adjusting the comparative prior periods presented. We will be continuously assessing the impact of the new standard and the impact on our systems, processes and controls through January 1, 2019, our planned adoption date. There are no other recently issued accounting standards that apply to the Company or that are expected to have a material impact on the Company’s results of operations, financial condition, or cash flows.

Acquisition

Acquisition	9 Months Ended
	Sep. 30, 2018
Business Combinations [Abstract]
Acquisition	NOTE 2. ACQUISITION Acquisition of NBIC On November 30, 2017, the Company completed the acquisition of all the outstanding capital stock of NBIC Holdings, Inc., the parent company of Narragansett Bay Insurance Company, a leading specialty underwriter of personal residential insurance products and services in several states in the northeastern United States for $250.0 million, including $210.0 million in cash, plus 2,222,215 shares of the Company’s common stock with an aggregate fair value of $40.0 million. The completion of the NBIC acquisition represents a significant advancement in executing the Company’s geographic diversification strategy by leveraging our combined platform to accelerate growth along the Eastern region. The Company recognized goodwill of $106 million, attributable to expected growth and profitability, none of which is expected to be deductible for income tax purposes. Refer to our 2017 Form 10-K for additional information on this acquisition. Unaudited Pro Forma Financial Information The following unaudited pro forma results of operations assume that the NBIC acquisition occurred at the beginning of the periods presented. The pro forma amounts include certain adjustments, including depreciation and amortization expense and income taxes. The unaudited pro forma information assumes the acquisition had taken place January 1, 2017. The unaudited pro forma effects for the three and nine months ended September 30, 2017 is as follows: For the Three Months Ended September 30, 2017 For the Nine Months Ended September 30, 2017 (In thousands, except per share) Revenue $ 176,123 $ 401,061 Net (loss) income $ (2,732 ) $ 14,662 Basic, (loss) earnings per share $ (0.12 ) $ 0.49 Diluted, (loss) earnings per share $ (0.12 ) $ 0.49

Investments

Investments	9 Months Ended
	Sep. 30, 2018
Investments Debt And Equity Securities [Abstract]
Investments	NOTE 3. INVESTMENTS The following table details the difference between cost or adjusted/amortized cost and estimated fair value, by major investment category, at September 30, 2018 and December 31, 2017: Cost or Adjusted / Amortized Cost Gross Gains Gross Losses Fair Value (In thousands) September 30, 2018 U.S. government and agency securities $ 46,934 $ 2 $ 1,051 $ 45,885 States, municipalities and political subdivisions 61,672 — 1,527 60,145 Special revenue 261,799 10 6,316 255,493 Industrial and miscellaneous 152,884 27 3,560 149,351 Redeemable preferred stocks 4,850 6 189 4,667 Total fixed maturities 528,139 45 12,643 515,541 Nonredeemable preferred stocks 13,808 17 654 13,171 Equity securities 3,098 37 597 2,538 Total equity securities 16,906 54 1,251 15,709 Total investments $ 545,045 $ 99 $ 13,894 $ 531,250 Cost or Adjusted / Amortized Cost Gross Unrealized Gains Gross Unrealized Losses Fair Value (In thousands) December 31, 2017 U.S. government and agency securities $ 39,445 $ 7 $ 572 $ 38,880 States, municipalities and political subdivisions 76,876 104 569 76,411 Special revenue 269,277 524 2,124 267,677 Industrial and miscellaneous 162,093 668 633 162,128 Redeemable preferred stocks 4,767 4 71 4,700 Total fixed maturities 552,458 1,307 3,969 549,796 Nonredeemable preferred stocks 14,450 69 195 14,324 Equity securities 3,098 64 269 2,893 Total equity securities 17,548 133 464 17,217 Total investments $ 570,006 $ 1,440 $ 4,433 $ 567,013 The Company calculates the gain or loss realized on the sale of investments by comparing the sales price (fair value) to the cost or adjusted/amortized cost of the security sold. The Company determines the cost or adjusted/amortized cost of the security sold using the specific-identification method. The following tables detail the Company’s net realized (losses) gains by major investment category for the three and nine months ended September 30, 2018 and 2017, respectively: 2018 2017 Gains (Losses) Fair Value at Sale Gains (Losses) Fair Value at Sale (In thousands) For the Three Months Ended September 30, Fixed maturities $ — $ 25 $ 413 $ 253,673 Equity securities 15 — 1,260 16,454 Total realized gains 15 25 1,673 270,127 Fixed maturities (3 ) 262 (23 ) 26,602 Equity securities (7 ) — (1,285 ) 6,781 Total realized losses (10 ) 262 (1,308 ) 33,383 Net realized gains $ 5 $ 287 $ 365 $ 303,510 2018 2017 Gains (Losses) Fair Value at Sale Gains (Losses) Fair Value at Sale (In thousands) For the Nine Months Ended September 30, Fixed maturities $ 76 $ 26,860 $ 448 $ 463,538 Equity securities 1 169 2,231 22,848 Total realized gains 77 27,029 2,679 486,386 Fixed maturities (230 ) 48,774 (197 ) 40,192 Equity securities (154 ) 4,146 (1,471 ) 10,610 Total realized losses (384 ) 52,920 (1,668 ) 50,802 Net realized (losses) gains $ (307 ) $ 79,949 $ 1,011 $ 537,188 The table below summarizes the Company’s fixed maturities at September 30, 2018 by contractual maturity periods. Actual results may differ as issuers may have the right to call or prepay obligations, with or without penalties, prior to the contractual maturity of those obligations. September 30, 2018 Cost or Amortized Cost Percent of Total Fair Value Percent of Total (In thousands) (In thousands) Due in one year or less $ 38,062 7 % $ 37,938 7 % Due after one year through five years 180,415 34 % 177,487 35 % Due after five years through ten years 135,420 26 % 130,345 25 % Due after ten years 174,242 33 % 169,771 33 % Total $ 528,139 100 % $ 515,541 100 % The following table summarizes the Company’s net investment income by major investment category for the three and nine months ended September 30, 2018 and 2017, respectively: For the Three Months Ended September 30, For the Nine Months Ended September 30, 2018 2017 2018 2017 (In thousands) Fixed maturities $ 3,020 $ 2,479 $ 8,018 $ 7,640 Equity securities 547 479 1,252 1,458 Cash, cash equivalents and short-term investments 284 441 861 544 Other investments 425 (24 ) 1,168 (24 ) Net investment income 4,276 3,375 11,299 9,618 Investment expenses 429 640 1,595 1,408 Net investment income, less investment expenses $ 3,847 $ 2,735 $ 9,704 $ 8,210 The Company does not intend to sell investments that are in an unrealized loss position and it is not likely that the Company will be required to sell any investments before recovery of their amortized cost basis. As such, the Company does not consider those investments with an unrealized loss to be other-than-temporarily impaired at September 30, 2018 or December 31, 2017. There were no material other-than-temporary impairments or credit losses related to available-for-sale securities in the three months ended September 30, 2018 and 2017. The following tables present an aging of our unrealized investment losses by investment class as of September 30, 2018 and December 31, 2017: Less Than Twelve Months Twelve Months or More Number of Securities Gross Unrealized Losses Fair Value Number of Securities Gross Unrealized Losses Fair Value (In thousands) September 30, 2018 U.S. government and agency securities 37 $ 192 $ 24,926 55 $ 859 $ 20,142 States, municipalities and political subdivisions 40 799 33,062 21 729 22,737 Industrial and miscellaneous 370 2,917 125,982 80 643 15,023 Special revenue 237 3,308 129,251 242 3,007 73,062 Redeemable preferred stocks 52 507 2,935 35 147 1,389 Total fixed maturities 736 7,723 316,156 433 5,385 132,353 Nonredeemable preferred stocks 188 127 10,934 11 62 801 Equity securities 15 187 817 15 410 1,105 Total equity securities 203 $ 314 $ 11,751 26 $ 472 $ 1,906 Total 939 $ 8,037 $ 327,907 459 $ 5,857 $ 134,259 Less Than Twelve Months Twelve Months or More Number Gross Losses Fair Number of Securities Gross Unrealized Losses Fair Value (In thousands) December 31, 2017 U.S. government and agency securities 53 $ 284 $ 20,053 24 $ 289 $ 9,294 States, municipalities and political subdivisions 51 359 49,803 8 210 10,503 Industrial and miscellaneous 284 376 87,898 38 256 11,788 Special revenue 295 777 133,580 183 1,347 69,359 Redeemable preferred stocks 41 66 3,987 17 5 61 Total fixed maturities 724 1,862 295,321 270 2,107 101,005 Nonredeemable preferred stocks 127 188 10,047 6 7 159 Equity securities 11 46 677 12 223 1,095 Total equity securities 138 $ 234 $ 10,724 18 $ 230 $ 1,254 Total 862 $ 2,096 $ 306,045 288 $ 2,337 $ 102,259

Fair Value of Financial Instrum

Fair Value of Financial Instruments	9 Months Ended
	Sep. 30, 2018
Fair Value Disclosures [Abstract]
Fair Value of Financial Instruments	NOTE 4. FAIR VALUE OF FINANCIAL INSTRUMENTS The Company measures equity securities at fair value on a recurring basis such as, redeemable preferred stock, nonredeemable preferred stock and common stock of domestic corporations which are measured using quoted prices in active markets for identical assets and as such, are represented Level 1 inputs. For the Company’s investments in U.S. government securities that do not have prices in active markets, agency securities, state and municipal governments, and corporate bonds, the Company obtains the fair values from its third-party valuation service and we evaluate the relevant inputs, assumptions, methodologies and conclusions associated with such valuations. The valuation service calculates prices for the Company’s investments in the aforementioned security types on a month-end basis by using several matrix-pricing methodologies that incorporate inputs from various sources. The model the valuation service uses to price U.S. government securities and securities of states and municipalities incorporates inputs from active market makers and inter-dealer brokers. To price corporate bonds and agency securities, the valuation service calculates non-call yield spreads on all issuers, uses option-adjusted yield spreads to account for any early redemption features, then adds final spreads to the U.S. Treasury curve as of quarter end. The inputs the valuation service uses in their calculations are not quoted prices in active markets, but are observable inputs, and therefore represent Level 2 inputs. The following table presents information about the Company’s assets measured at fair value on a recurring basis. The Company assesses the levels for the investments at each measurement date, and transfers between levels are recognized on the actual date of the event or change in circumstances that caused the transfer in accordance with the Company’s accounting policy regarding the recognitions of transfers between levels of the fair value hierarchy. At September 30, 2018 and December 31, 2017, there were no transfers in or out of Level 1, 2, and 3. September 30, 2018 Total Level 1 Level 2 Level 3 (In thousands) Fixed maturities investments: U.S. government and agency securities $ 45,885 $ 350 $ 45,535 $ — States, municipalities and political subdivisions 60,145 — 60,145 — Special revenue 255,493 — 255,493 — Industrial and miscellaneous 149,351 — 149,351 — Redeemable preferred stocks 4,667 4,667 — — Total fixed maturities investments $ 515,541 $ 5,017 $ 510,524 $ — Nonredeemable preferred stocks 13,171 13,171 — — Equity securities 2,538 2,538 — — Total equity securities $ 15,709 $ 15,709 $ — $ — Total investments $ 531,250 $ 20,726 $ 510,524 $ — December 31, 2017 Total Level 1 Level 2 Level 3 (In thousands) Fixed maturities investments: U.S. government and agency securities $ 38,880 $ 359 $ 38,521 $ — States, municipalities and political subdivisions 76,411 — 76,411 — Special revenue 267,677 — 267,677 — Industrial and miscellaneous 162,128 — 162,128 — Redeemable preferred stocks 4,700 — 4,700 — Total fixed maturities investments $ 549,796 $ 359 $ 549,437 $ — Nonredeemable preferred stocks 14,324 14,324 — — Equity securities 2,893 2,893 — — Total equity securities $ 17,217 $ 17,217 $ — $ — Total investments $ 567,013 $ 17,576 $ 549,437 $ —

Other Comprehensive Income (Los

Other Comprehensive Income (Loss)	9 Months Ended
	Sep. 30, 2018
Comprehensive Income Net Of Tax [Abstract]
Other Comprehensive Income (Loss)	NOTE 5. OTHER COMPREHENSIVE INCOME (LOSS) The following table is a summary of other comprehensive income (loss) and discloses the tax impact of each component of other comprehensive income for the three and nine months ended September 30, 2018 and 2017, respectively: For the Three Months Ended September 30, 2018 2017 Pre-tax Tax After-tax Pre-tax Tax After-tax (In thousands) Other comprehensive (loss) income Change in unrealized losses on investments, net $ (2,895 ) $ 1,666 $ (1,229 ) $ 593 $ (158 ) $ 435 Reclassification adjustment of realized losses (gains) included in net income (5 ) (1 ) (6 ) (365 ) 77 (288 ) Effect on other comprehensive (loss) income $ (2,900 ) $ 1,665 $ (1,235 ) $ 228 $ (81 ) $ 147 For the Nine Months Ended September 30, 2018 2017 Pre-tax Tax After-tax Pre-tax Tax After-tax (In thousands) Other comprehensive (loss) income Change in unrealized losses on investments, net $ (9,918 ) $ 3,185 $ (6,733 ) $ 8,473 $ (3,078 ) $ 5,395 Reclassification adjustment of realized losses (gains) included in net income 307 64 371 (1,011 ) 212 (799 ) Effect on other comprehensive (loss) income $ (9,611 ) $ 3,249 $ (6,362 ) $ 7,462 $ (2,866 ) $ 4,596

Property and Equipment, Net

Property and Equipment, Net	9 Months Ended
	Sep. 30, 2018
Property Plant And Equipment [Abstract]
Property and Equipment, Net	NOTE 6. PROPERTY AND EQUIPMENT, NET Property and equipment, net consisted of the following at September 30, 2018 and December 31, 2017: September 30, 2018 December 31, 2017 (In thousands) Land $ 2,582 $ 2,582 Building 12,102 12,148 Computer hardware and software 4,519 4,093 Office furniture and equipment 1,058 759 Tenant and leasehold improvements 4,341 3,660 Vehicle fleet 880 815 Total, at cost 25,482 24,057 Less: accumulated depreciation and amortization 7,002 5,309 Property and equipment, net $ 18,480 $ 18,748 Depreciation and amortization expense for property and equipment was $1.0 million and $394,000 for the three months ended September 30, 2018 and 2017, and for the nine months ended $1.7 million and $1.2 million, respectively. The Company’s real estate consists of 15 acres of land and five buildings with a gross area of 229,000 square feet including a parking garage.

Goodwill and Other Intangible A

Goodwill and Other Intangible Assets	9 Months Ended
	Sep. 30, 2018
Goodwill And Intangible Assets Disclosure [Abstract]
Goodwill and Other Intangible Assets	NOTE 7. GOODWILL AND OTHER INTANGIBLE ASSETS Goodwill and Intangible Assets At September 30, 2018 and December 31, 2017 goodwill (see Note 2) was $152.5 million and intangible assets were $81.9 million and $101.6 million, respectively. The Company has determined the useful life of the value of the business acquired from the NBIC acquisition to be one year. The Company has determined the useful life of the other intangible assets to range between 2.5-15 years. The Company has recorded $1.3 million relating to insurance licenses and classified as an indefinite lived intangible which is subject to annual impairment testing concurrent with goodwill. Goodwill (In thousands) Balance as of December 31, 2017 $ 152,459 Goodwill acquired — Impairment — Balance as of September 30, 2018 $ 152,459 Other Intangible Assets Our intangible assets resulted primarily from the acquisitions of Zephyr Acquisition Company and NBIC Holdings, Inc. and consist of brand, agent relationships, renewal rights, customer relations, trade names, non-competes and insurance licenses. Amortization expense of our intangible assets for the three months ended September 30, 2018 and 2017 was $6.4 million and $55,000, respectively and $19.7 million and $3.6 million for the nine months ended September 30, 2018 and 2017, respectively. No impairment in the value of amortizing or non-amortizing intangible assets was recognized during the nine months ended September 30, 2018 or 2017. Estimated annual pretax amortization of intangible assets for each of the next five years and thereafter is as follows (in thousands): Year Amount (1) 2018 remaining $ 5,060 2019 $ 8,208 2020 $ 6,365 2021 $ 6,351 2022 $ 6,351 2023 $ 6,351 Thereafter $ 41,910 Total $ 80,596 (1) Excludes insurance licenses valued at $1.3 million and classified as an indefinite lived intangible which is subject to annual impairment testing and not amortized.

Earnings Per Share

Earnings Per Share	9 Months Ended
	Sep. 30, 2018
Earnings Per Share [Abstract]
Earnings Per Share	NOTE 8. EARNINGS PER SHARE The following table sets forth the computation of basic and diluted earnings (loss) per share (“EPS”) for the periods indicated. For the Three Months Ended September 30, For the Nine Months Ended September 30, 2018 2017 2018 2017 Basic earnings (loss) per share: Net income (loss) attributable to common stockholders (000's) $ 5,989 $ (8,696 ) $ 23,227 $ 3,929 Weighted average shares outstanding 25,631,871 25,883,267 25,663,415 27,647,146 Basic earnings (loss) per share: $ 0.23 $ (0.34 ) $ 0.91 $ 0.14 Diluted earnings (loss) per share: Net income (loss) attributable to common stockholders (000's) $ 5,989 $ (8,696 ) $ 23,227 $ 3,929 Weighted average shares outstanding 25,631,871 25,883,267 25,663,415 27,647,146 Weighted average dilutive shares 415,067 — 677,344 — Total weighted average dilutive shares 26,046,938 25,883,267 26,340,759 27,647,146 Diluted earnings (loss) per share: $ 0.23 $ (0.34 ) $ 0.88 $ 0.14 The Company excludes shares potentially issuable under the Company’s Omnibus plan that could dilute basic net EPS in the future from the calculation of diluted net earnings (loss) per share, as their effect, if included, would have been anti-dilutive for the periods presented.

Deferred Policy Acquisition Cos

Deferred Policy Acquisition Costs	9 Months Ended
	Sep. 30, 2018
Insurance [Abstract]
Deferred Policy Acquisition Costs	NOTE 9. DEFERRED POLICY ACQUISITION COSTS The Company defers certain income in connection with its quota share treaties, the ceded reinsurance commissions income, called deferred reinsurance ceding commissions (“DRCC”), which are deferred and earned over the terms of the reinsurance agreements. Ceding commission on quota share agreements call for provisional ceding rate, subject sliding scale adjustments based on the loss experience of the reinsurers. Adjustments are reflected in current operations. The Company allocates 75% of total ceding commission income to policy acquisition costs and 25% of total ceding commission income to general & administrative expense. The table below represents the activity with regard to DPCC during the three and nine months ended September 30, 2018 and 2017: For the Three Months Ended September 30, For the Nine Months Ended September 30, 2018 2017 2018 2017 (In thousands) Beginning balance of deferred ceding commission income $ 42,666 $ — $ 42,665 $ — Ceding commission deferred 18,932 — 56,495 — Less: ceding commission earned (18,307 ) — (55,869 ) — Ending balance of deferred ceding commission income $ 43,291 $ — $ 43,291 $ — For the three and nine months ended September 30, 2018, the Company allocated ceding commission income of $13.7 million and $42.1 million to policy acquisition costs and $4.5 million and $13.8 million to general and administrative expense, respectively. The Company defers certain costs in connection with written policies, called deferred policy acquisition costs (“DPAC”), which are amortized over the effective period of the related insurance policies. The Company anticipates that its DPAC will be fully recoverable in the near term. The table below depicts the activity with regard to DPAC during the three and nine months ended September 30, 2018 and 2017: For the Three Months Ended September 30, For the Nine Months Ended September 30, 2018 2017 2018 2017 (In thousands) Beginning Balance $ 69,648 $ 41,792 $ 41,678 $ 42,779 Policy acquisition costs deferred 12,108 21,002 68,048 65,195 Amortization (6,054 ) (20,906 ) (34,024 ) (66,086 ) Ending Balance $ 75,702 $ 41,888 $ 75,702 $ 41,888

Income Taxes

Income Taxes	9 Months Ended
	Sep. 30, 2018
Income Tax Disclosure [Abstract]
Income Taxes	NOTE 10. INCOME TAXES During the nine months ended September 30, 2018 and 2017, the Company recorded $9.1 million and $7.4 million, respectively, of income tax expense which corresponds to an estimated annual effective tax rate of 28.1% and 65.3%, respectively. Effective tax rates are dependent upon components of pre-tax earnings and the related tax effects. The Tax Cuts and Jobs Act of 2017 (“Tax Act”) lowered the federal corporate tax rate from 35% to 21% effective January 1, 2018, causing a decrease in the statutory tax rate when compared to the prior year. The effective tax rate can fluctuate throughout the year as estimates used in the tax provision for the first quarter are updated as more information becomes available throughout the year. The amortization of the conversion option discount and valuation change for the conversion option associated with the Convertible Notes for the nine months ended September 30, 2017 was not deductible for income tax purposes. This had a significant adverse impact on the effective tax rate for the nine months ended September 30, 2017. Excluding the impact of the non-deductible items related to the convertible note, the 2017 year-to-date effective tax rate would be 41.1%. The table below summarizes the significant components of our net deferred tax assets (liabilities): September 30, 2018 December 31, 2017 Deferred tax assets: (In thousands) Unearned premiums $ 10,780 $ 12,488 Unearned commission 10,417 11,987 Net operating loss — 4,727 Tax-related discount on loss reserve 1,486 1,250 Unrealized loss 3,347 — Stock-based compensation 1,126 — Prepaid expenses 2,214 1,950 Other 1,429 331 Total deferred tax asset 30,799 32,733 Deferred tax liabilities: Deferred acquisition costs 18,216 9,775 Prepaid expenses 342 27,568 Unrealized gains — 30 Property and equipment 452 — Note discount 2,498 3,818 Basis in purchased investments 179 335 Basis in purchased intangibles 19,518 24,250 Other 1,557 1,290 Total deferred tax liabilities 42,762 67,066 Net deferred tax liability $ (11,963 ) $ (34,333 ) On December 22, 2017, the U.S. government enacted the Tax Act, which makes broad and complex changes to the U.S. Tax code. One of the provisions of the Tax Act reduced the corporate federal income tax rate from 35% to 21% effective January 1, 2018. Pursuant to current accounting guidance, all deferred tax assets and liabilities were re-measured in 2017 to recognize the tax rate that is expected to apply when the tax effects are ultimately recognized in future periods upon the date of enactment. Certain income tax effects of the Tax Act are reflected in the Company’s financial results in accordance with Staff Accounting Bulletin No. 118 (“SAB 118”), which provides SEC staff guidance regarding the application of ASC 740. Our 2017 Form 10-K discusses enactment of the Tax Act on December 22, 2017, and its impact on our financial results for that period. Interpretive guidance of the Tax Act will continue to be received throughout 2018, and we expect to update our estimates and our disclosure on a quarterly basis as interpretative guidance is received within each quarter. During the period ended September 30, 2018, the U.S. Treasury Department and the Internal Revenue Service have not issued further clarification or guidance for the items for which our accounting for the Tax Act is incomplete. In assessing the net carrying amount of deferred tax assets, we consider whether it is more likely than not that we will not realize some portion or all of the deferred tax assets. The ultimate realization of deferred tax assets depends upon the generation of future taxable income during the periods in which those temporary differences become deductible. We consider the scheduled reversal of deferred tax liabilities, projected future taxable income and tax planning strategies in making this assessment. The statute of limitations related to our federal and state income tax returns remains open from our filings for 2015 through 2017. For the 2014 tax year, the federal income tax return was examined by the tax authority resulting in no material adjustment. Currently, no taxing authorities are examining any of our federal or state income tax returns. At September 30, 2018 and December 31, 2017, we had no significant uncertain tax positions.

Reinsurance

Reinsurance	9 Months Ended
	Sep. 30, 2018
Insurance [Abstract]
Reinsurance	NOTE 11. REINSURANCE The Company’s reinsurance program is designed, utilizing the Company’s risk management methodology, to address its exposure to catastrophes or large non-catastrophic losses. The Company’s program provides reinsurance protection for catastrophes including hurricanes, tropical storms, tornadoes and winter storms. The Company’s reinsurance agreements are part of its catastrophe management strategy, which is intended to provide its stockholders an acceptable return on the risks assumed in its property business, and to reduce variability of earnings, while providing protection to the Company’s policyholders. 2018 – 2019 Reinsurance Program In order to limit our potential exposure to catastrophic events, we purchase significant reinsurance from third party reinsurers and sponsor catastrophe bonds issued by Citrus Re. The catastrophe reinsurance may be on an excess of loss or quota share basis. We also purchase reinsurance for non-catastrophe losses on a quota share, per risk or facultative basis. Purchasing a sufficient amount of reinsurance to consider catastrophic losses from single or multiple events or significant non-catastrophe losses is an important part of our risk strategy, and premiums paid (or ceded) to reinsurers is one of our largest cost components. Reinsurance involves transferring, or “ceding”, a portion of the risk exposure on policies we write to another insurer, known as a reinsurer. To the extent that our reinsurers are unable to meet the obligations they assume under our reinsurance agreements, we remain liable for the entire insured loss. Our reinsurance agreements are, prospective contracts. We record an asset, prepaid reinsurance premiums, and a liability, reinsurance payable, for the entire contract amount upon commencement of our new reinsurance agreements. We generally amortize our catastrophe reinsurance premiums over the 12-month contract period on a straight-line basis, which is June 1 through May 31. Our quota share reinsurance is amortized over the 12-month contract period and may be purchased on a calendar or fiscal year basis. In the event that we incur losses and loss adjustment expenses recoverable under our reinsurance program, we record amounts recoverable from our reinsurers on paid losses plus an estimate of amounts recoverable on unpaid losses. The estimate of amounts recoverable on unpaid losses is a function of our liability for unpaid losses associated with the reinsured policies; therefore, the amount changes in conjunction with any changes to our estimate of unpaid losses. As a result, a reasonable possibility exists that an estimated recovery may change significantly in the near term from the amounts included in our consolidated financial statements. Our insurance regulators require all insurance companies, like us, to have a certain amount of capital and reinsurance coverage in order to cover losses and loss adjustment expenses upon the occurrence of a catastrophic event. Our 2018-2019 reinsurance program provides reinsurance in excess of our state regulator requirements, which are based on the probable maximum loss that we would incur from an individual catastrophic event estimated to occur once in every 100 years based on our portfolio of insured risks. The nature, severity and location of the event giving rise to such a probable maximum loss differs for each insurer depending on the insurer’s portfolio of insured risks, including, among other things, the geographic concentration of insured value within such portfolio. As a result, a particular catastrophic event could be a one-in-100-year loss event for one insurance company while having a greater or lesser probability of occurrence for another insurance company. We also purchase reinsurance coverage to protect against the potential for multiple catastrophic events occurring in the same year. We share portions of our reinsurance program coverage among our insurance company affiliates. Catastrophe Excess of Loss Reinsurance Effective June 1, 2018, we entered into catastrophe excess of loss reinsurance agreements covering Heritage P&C, Zephyr and NBIC. The catastrophe reinsurance programs are allocated amongst traditional reinsurers, catastrophe bonds issued by Citrus Re Ltd., a Bermuda special purpose insurer formed in 2014 (“Citrus Re”) and the Florida Hurricane Catastrophe Fund (“FHCF”). The FHCF covers Florida risks only and we participate at 45%. Citrus Re, which provides fully collateralized multi-year coverage, covers catastrophe losses incurred by Heritage P&C only through the 2016 Class D and 2017-1 Notes, and covers catastrophe losses incurred by Heritage P&C, Zephyr and NBIC through the 2016 Class E Note. Our third-party reinsurers are either rated “A- “or higher by A.M. Best or S&P or are fully collateralized, to reduce credit risk. The reinsurance program, which is segmented into layers of coverage, protects the Company for excess property catastrophe losses and loss adjustment expenses. The 2018-2019 reinsurance program provides first event coverage up to $1.6 billion for Heritage P&C, first event coverage up to $801 million for Zephyr, and first event coverage up to $1.0 billion for NBIC. Our first event retention for each insurance company subsidiary follows: Heritage P&C - $20.0 million [given small amount did not reduce HPCI net retention for first event by $4.0 million for Osprey portion]; Zephyr - $20.0 million; NBIC – $12.8 million. Our second and third event retentions for each insurance company subsidiary follows: Heritage P&C - $16.0 million; Zephyr - $16 million; NBIC – $8.8 million. Our program was placed on a cascading basis which provides greater horizontal protection in a multiple small events scenario and features additional coverage enhancements. This coverage exceeds the requirements established by the Companies’ rating agency, Demotech, Inc., the Florida Office of Insurance Regulation, the Hawaii Insurance Division, and the Rhode Island Department of Business Regulation. For the twelve months ending May 31, 2019, no single uncollateralized private reinsurer represented more than 10% of the overall limit purchased from our total reinsurance coverage. We are responsible for all losses and loss adjustment expenses in excess of our reinsurance program. For second or subsequent catastrophic events, our total available coverage depends on the magnitude of the first event, as we may have coverage remaining from layers that were not previously fully exhausted. An aggregate of $3.4 billion of limit purchased in 2018 includes reinstatement through the purchase of reinsurance reinstatement premium. In total, we have purchased $3.5 billion of potential reinsurance coverage, including our retention, for multiple catastrophic events. Our ability to access this coverage, however, will be subject to the severity and frequency of such events. The Company's estimated net cost for the 2018-2019 catastrophe reinsurance programs is approximately $252.0 million. Gross Quota Share Reinsurance NBIC purchased an 8% gross quota share reinsurance treaty effective June 1, 2018 which provides ground up loss recoveries of up to $1.0 billion. Prior to this treaty, NBIC’s gross quota share treaty was 18.75%. Net Quota Share Reinsurance NBIC’s net quota share coverage is proportional reinsurance for which certain of our other reinsurance inures to the quota share (property catastrophe excess of loss and reinstatement premium protection and the second layer of the general excess of loss.) An occurrence limit of $20.0 million for catastrophe losses is in effect on the quota share, subject to certain aggregate loss limits that vary by reinsurer. The amount and rate of reinsurance commissions slide, within a prescribed minimum and maximum, depending on loss performance. NBIC ceded 60% of net premiums and losses during 2017 to the Net Quota Share. The net quota share program was renewed on December 31, 2017 ceding 49.5% of the net premiums and losses and 8% of the prior year quota share will runoff. Aggregate Coverage Heritage P&C and Zephyr $1.1 billion of limit is structured on an aggregate basis (Top and Aggregate, Layer 1, Layer 2, Layer 3, Layer 4, Stub layers, Multi-Zonal, 2017-1 Notes and 2016 Class E Notes). To the extent that this coverage is not fully exhausted in the first catastrophic event, it provides coverage commencing at its reduced retention for second and subsequent events where underlying coverage has been previously exhausted. The Company paid a reinsurance reinstatement premium for $669.0 million of this coverage, which can be a reinstated one time. Layers (with exception to FHCF and 2016 Class D Notes) are “net” of a $40.0 million attachment point. Layers inure to the subsequent layers if the aggregate limit of the preceding layer(s) is exhausted, and the subsequent layer cascades down in its place. Aggregate Coverage - NBIC For the year ended December 31, 2017, NBIC had 25% of an Aggregate contract, in two sections: • Section 1: $20.0 million excess $21.5 million in the aggregate for all catastrophe losses excluding named tropical storms. • Section 2: $12.0 million excess $8.0 million for named tropical storm losses. NBIC placed 25% of an aggregate contract, which covers all catastrophe losses excluding named storms, on December 31, 2017, expiring May 31, 2018. The limit on the contract is $13.5 million, retention of $18.5 million and franchise deductible of $1.0 million. NBIC placed 42.50% of an aggregate contract, which covers all catastrophe losses excluding named storms, on May 31, 2018, expiring December 31, 2018. The limit on the contract is $20.0 million, retention of $3.0 million and franchise deductible of $1.5 million. NBIC placed 92.00% of an occurrence contract, which covers all catastrophe losses excluding named storms, on May 31, 2018, expiring December 31, 2018. The limit on the contract is $20.0 million with a retention of $20.0 million. Per Risk Coverage The Company also purchased property per risk coverage for losses and loss adjustment expenses in excess of $1.0 million per claim. The limit recovered for an individual loss is $9.0 million and total limit for all losses is $27.0 million. There are two reinstatements available with additional premium due based on the amount of the layer exhausted. In addition, the Company purchased facultative reinsurance in excess of $10.0 million for any commercial properties it insured where the total insured value exceeded $10.0 million. General Excess of Loss NBIC’s general excess of loss reinsurance protects NBIC from single risk losses, both property and casualty. The casualty coverage provided by this contract also responds on a “Clash” basis, meaning that multiple policies involved in a single loss occurrence can be aggregated into one loss and applied to the reinsurance contract. The coverage is in two layers in excess of NBIC’s retention of the first $300,000 of loss. The first layer is $450,000 excess $300,000 and the second layer is $2.75 million excess $750,000 (Casualty second layer is $1.25 million excess $750,000). Both layers are 92% placed with the gross quota share providing the additional 8% coverage. Semi-Automatic Facultative Excess of Loss NBIC’s automatic property facultative reinsurance protects NBIC from single risk losses, for property risks with a total insured value excess of $3.5 million subject to a limit of $3.75 million. 2017 – 2018 Reinsurance Program Heritage P&C and Zephyr Program The Company placed its reinsurance program for the period from June 1, 2017 through May 31, 2018 during the third quarter of 2017. This reinsurance program incorporated the catastrophe risk of our two insurance subsidiaries, Heritage P&C, a Florida based insurer writing property insurance in multiple states, and Zephyr, a Hawaii based insurer. The programs were allocated amongst traditional reinsurers, catastrophe bonds issued by Citrus Re Ltd., a Bermuda special purpose insurer formed in 2014 (“Citrus Re”), and the Florida Hurricane Catastrophe Fund (“FHCF”). Coverage was specific to each insurer unless otherwise noted. The 2017-2018 reinsurance program provided, including retention, first event coverage up to $1.75 billion in Florida, first event coverage up to $731.0 million in Hawaii, and multiple event coverage up to $2.6 billion. This coverage exceeded the requirements established by the Company’s rating agency, Demotech, Inc., the Florida Office of Insurance Regulation, and the Hawaii Insurance Division. For the twelve months ended May 31, 2018, no single uncollateralized private reinsurer represented more than 10% of the overall limit purchased from our total reinsurance coverage. The reinsurance program, which was segmented into layers of coverage, protected the Company for excess property catastrophe losses and loss adjustment expenses. The Company’s 2017-2018 reinsurance program incorporated the mandatory coverage required by law to be placed with FHCF, which was available only for Florida catastrophe risk. For the 2017 hurricane season, the Company maintained the prior year selected participation percentage in the FHCF at 45%. The Company also purchased private reinsurance below and alongside the FHCF layer, as well as aggregate reinsurance coverage. The Company did not utilize its captive, Osprey, for any catastrophe risk for the 2017 hurricane season. The Company had a primary retention of the first $20.0 million of losses and loss adjustment expenses. Additionally, the December 1, 2016 treaty between Heritage P&C and Osprey was commuted effective June 1, 2017. Heritage P&C provides property insurance coverage for states other than Hawaii. The following describes the various layers of its June 1, 2017 to May 31, 2018 reinsurance program: • Heritage P&C’s Retention . If a first catastrophic event stuck a Heritage P&C risk, its primary retention was the first $20.0 million ($15.0 million plus $5.0 million co-participation on the Top and Aggregate layer described below) of losses and loss adjustment expenses. If a second catastrophic event stuck a Heritage P&C risk, its primary retention decreases to $16.0 million and the remainder of the losses were ceded to third parties. In a first event exceeding approximately $878.0 million, there was an additional co-participation of 20% subject to a maximum co-participation of $727,000. Assuming a 1-100yr first event, a second event exceeding approximately $420.0 million, resulted in an additional Company co-participation of 11.5% subject to a maximum co-participation of $36.0 million. Heritage P&C had a $16.0 million (including 20% co-participation) primary retention after a 1-100 yr. first event for events beyond the second catastrophic event. • Shared Layers . Immediately above the retention, the Company purchased $372.0 million of reinsurance from third party reinsurers . This coverage included the following layers: Top and Aggregate layer, Underlying layer, Layer 1, Layer 2 and a private sliver alongside those layers. Through the payment of a reinstatement premium, Heritage P&C and Zephyr were able to reinstate $352.0 million of this reinsurance one time. There was $20.0 million of shared coverage subject to a seasonal aggregate of $68.0 million. • FHCF Layer . Heritage P&C’s FHCF program provided coverage for Florida events only and included an estimated maximum provisional limit of 45% of $1.3 billion, in excess of its retention of $414 million. The limit and retention of the FHCF coverage was subject to upward or downward adjustment based on, among other things, submitted exposures to FHCF by all participants. Heritage P&C purchased coverage alongside from third party reinsurers and through reinsurance agreements with Citrus Re. To the extent the FHCF coverage was adjusted, this private reinsurance with third party reinsurers and Citrus Re would adjust to fill in any gaps in coverage up to the reinsurers’ aggregate limits for this layer. The FHCF coverage cannot be reinstated once exhausted, but it did provide coverage for multiple events. • Layers alongside the FHCF. The Heritage P&C reinsurance program included third party layers alongside the FHCF. These included 2015 B and 2015 C series catastrophe bonds, 2016 D and 2016 E catastrophe bonds and 2017-2 catastrophe bonds issued by Citrus Re, which totaled $412.5 million of coverage, as discussed below, as well as a traditional reinsurance layer providing $5.0 million of coverage. • 2017-2 Notes: During May 2017, Heritage P&C entered into a catastrophe reinsurance agreement with Citrus Re. The agreements provide for three years of coverage from catastrophic losses caused by named storms, including hurricanes, beginning on June 1, 2017. Heritage P&C pays a periodic premium to Citrus Re during this three-year risk period. Citrus Re issued an aggregate of $35.0 million of principal-at-risk variable notes due March 2020 to fund the reinsurance trust account and its obligations to Heritage P&C for $35 million of coverage under the reinsurance agreements. The limit of coverage is fully collateralized by a reinsurance trust account for the benefit of Heritage P&C. The maturity date of the notes may be extended up to two additional years to satisfy claims for catastrophic events occurring during the three-year term of the reinsurance agreements. We anticipate this layer will be exhausted due to Hurricane Irma losses. This coverage does not reinstate and any gap in coverage for the 2018 hurricane season will be addressed in our 2018-2019 catastrophe reinsurance program. • 2016 Class D and E Notes: During February 2016, Heritage P&C and Zephyr entered into two catastrophe reinsurance agreements with Citrus Re. The agreements provide for three years of coverage from catastrophic losses caused by named storms, including hurricanes, beginning on June 1, 2016. For the 2017 hurricane seasons these notes provide coverage only to Heritage P&C who pays a periodic premium to Citrus Re during this three-year risk period. Citrus Re issued an aggregate of $250.0 million of principal-at-risk variable notes due February 2019 to fund the reinsurance trust account and its obligations to Heritage P&C under the reinsurance agreements. The Class D notes provide $150.0 million of coverage and the Class E notes provide $100.0 million of coverage. The Class D and Class E notes provide reinsurance coverage for a sliver of the catastrophe coverage that had previously been provided by the FHCF. The limit of coverage is fully collateralized by a reinsurance trust account for the benefit of Heritage P&C. The maturity date of the notes may be extended up to two additional years to satisfy claims for catastrophic events occurring during the three-year term of the reinsurance agreements. We anticipate that a portion of the 2016 Class E notes layer will be exhausted due to Hurricane Irma losses. This coverage does not reinstate and any gap in coverage for the 2018 hurricane season will be addressed in our 2018-2019 catastrophe reinsurance program. • 2015 Class B and C Notes : During April 2015, Heritage P&C entered into catastrophe reinsurance agreements with Citrus Re. The agreements provide for three years of coverage from catastrophic losses caused by named storms, including hurricanes, beginning on June 1, 2015. Heritage P&C pays a periodic premium to Citrus Re during this three-year risk period. Citrus Re issued principal-at-risk variable notes due April 2018 to fund the reinsurance trust account and its obligations to Heritage P&C under the reinsurance agreements. The Class B notes provide $97.5 million of coverage, and the Class C notes provide $30.0 million of coverage. The Class B and Class C notes provide reinsurance coverage for a sliver of the catastrophe coverage that had previously been provided by the FHCF. The limit of coverage is fully collateralized by a reinsurance trust account for the benefit of Heritage P&C. The maturity date of the notes may be extended up to two additional years to satisfy claims for catastrophic events occurring during the three-year term of the reinsurance agreements. We anticipate that a portion of the 2015 Class B and C notes layer will be exhausted due to Hurricane Irma losses. We have directed the Trustee to hold the collateral beyond the contract period to provide reimbursements for Hurricane Irma claims. This layer of reinsurance coverage will expire in advance of the 2018 hurricane season and any gap in coverage for the 2018 hurricane season will be addressed in our 2018-2019 catastrophe reinsurance program. Layers above the FHCF - Florida program • 2017-1 Notes: During March 2017, Heritage P&C entered into catastrophe reinsurance agreements with Citrus Re. The agreements provide for three-years of coverage from catastrophic losses caused by named storms, including hurricanes, beginning on June 1, 2017. Heritage P&C pays a periodic premium to Citrus Re during this three-year risk period. Citrus Re issued principal-at-risk variable notes due March 2020 to fund the reinsurance trust account and its obligations to Heritage P&C under the reinsurance agreements. The notes provide $125.0 million of coverage for a layer above the FHCF. The limit of coverage is fully collateralized by a reinsurance trust account for the benefit of Heritage P&C. The maturity date of the notes may be extended up to two additional years to satisfy claims for catastrophic events occurring during the three-year term of the reinsurance agreements. • 2015 Class A Notes: During April 2015, Heritage P&C entered into catastrophe reinsurance agreements with Citrus Re. The agreements provide for three years of coverage from catastrophic losses caused by named storms, including hurricanes, beginning on June 1, 2015. Heritage P&C pays a periodic premium to Citrus Re during this three-year risk period. Citrus Re issued principal-at-risk variable notes due April 2018 to fund the reinsurance trust account and its obligations to Heritage P&C under the reinsurance agreements. The Class A notes provide $150.0 million of coverage for a layer above the FHCF. The limit of coverage is fully collateralized by a reinsurance trust account for the benefit of Heritage P&C. The maturity date of the notes may be extended up to two additional years to satisfy claims for catastrophic events occurring during the three-year term of the reinsurance agreements. • Multi-Zonal Layers. The Company purchased additional layers which provided coverage for Heritage P&C for a second event and both first and second event coverage for Hawaii. The first event coverage for Hawaii was a counterpart to the multi-state catastrophe bond layers and FHCF layer. There was a total of $254.0 million of reinsurance coverage purchased on this basis, which the Company may reinstate one time through the payment of a reinsurance reinstatement premium. • Aggregate Coverage . In addition to what is described above, much of the reinsurance was structured in a way to provide aggregate coverage. $984.0 million of limit was structured on this basis (Top and Aggregate, Underlying, Layer 1, Layer 2, Private layers, Multi-Zonal, 2017-1 Notes, 2017-2 Notes, and 2015 Class A Notes). To the extent that this coverage is not fully exhausted in the first catastrophic event, it provides coverage commencing at its reduced retention for second and subsequent events where underlying coverage has been previously exhausted The Company paid a reinsurance reinstatement premium for $606.0 million of this coverage, which can be a reinstated one time. Layers (with exception to FHCF, 2016 Class D & E Notes, and 2015 Class B & C Notes) are “net” of a $40.0 million attachment point. Layers inure to the subsequent layers if the aggregate limit of the preceding layer(s) is exhausted, and the subsequent layer cascades down in its place. Zephyr provides property insurance coverage for Hawaii. The various layers of its 2017-2018 reinsurance program area as follows: • Zephyr’s Retention . If a first catastrophic event stuck Hawaii, Zephyr had a primary retention of the first $20.0 million ($15.0 million plus $5.0 million co-participation on the Top and Aggregate layer) of losses and loss adjustment expenses. If a second event stuck Hawaii, Zephyr’s primary retention decreased to $16.0 million and the remainder of losses were ceded to third parties. In a first event exceeding approximately $386.0 million, there was an additional co-participation of 3.8% subject to a maximum co-participation of $12.0 million. Assuming a 1-100-year event, a second event exceeding approximately $386.0 million results in an additional co-participation of 117.7%, subject to a maximum co-participation of $56 million. Zephyr had a $16.0 million primary retention for events beyond the second catastrophic event. • Shared Layers above retention . Immediately above the retention, the Company purchased $372.0 million of reinsurance from third party reinsurers. This coverage includes the following layers: Top and Aggregate layer, Underlying layer, Layer 1, Layer 2 and a private sliver alongside those layers. Through the payment of a reinsurance reinstatement premium, Heritage P&C and Zephyr may reinstate $352.0 million of this reinsurance one time. There was $20.0 million of shared coverage subject to a seasonal aggregate of $68.0 million. • Multi-Zonal Layers. The Company purchased additional layers which provide coverage for Florida for a second event and both first and second event coverage for Hawaii. The first event coverage for Hawaii was a counterpart to the multi-state catastrophe bond layers and FHCF layer. There was a total of $302.0 million of reinsurance coverage purchased on this basis, of which $254.0 million can be reinstated through the payment of reinsurance restatement premium. The multi-zonal occurrence layer provided first and second event coverage of $254.0 million for Hawaii and second event coverage of $254.0 million for Florida. A Top and Aggregate multi-zonal layer provided first event coverage of $48.0 million for Hawaii and second or subsequent event coverage of $48.0 million for Florida. • Top Hawaii only layer. • Aggregate Coverage . In addition to what is described above, much of the reinsurance was structured in a way to provide aggregate coverage. An aggregate of $700.0 million of limit was structured on this basis (Top and Aggregate, Underlying, Layer 1, Layer 2, Private Layers, Multi-Zonal, Hawaii Only). To the extent that this coverage was not fully exhausted in the first catastrophic event, it provided coverage commencing at its reduced retention for second and subsequent events where underlying coverage has been previously exhausted. $632.0 million can be reinstated through the payment of a reinsurance premium. For a first catastrophic event striking Florida, our 2017-2018 reinsurance program provided coverage of up to $1.75 billion of losses and loss adjustment expenses, including our retention, and we are responsible for all losses and loss adjustment expenses in excess of such amount. For a first catastrophic event striking Hawaii, our 2017-2018 reinsurance program provided coverage up to $731.0 million of losses and loss adjustment expenses, including our retention, and we are responsible for all losses and loss adjustment expenses in excess of such amount. For subsequent catastrophic events, our total available coverage depended on the magnitude of the first event, as we may have coverage remaining from layers that were not previously fully exhausted. An aggregate of $632.0 million of limit purchased in 2017 included reinstatement through the purchase of reinsurance reinstated premium. In total, for the 2017-2018 reinsurance program, we purchased $2.6 billion of potential reinsurance coverage, including our retention, for multiple catastrophic events. Our ability to access this coverage, however, is subject to the severity and frequency of such events. Hurricane losses in states other than Hawaii were covered under the Heritage P&C program with the exception of the FHCF coverage and the series 2015, 2016 and 2017 catastrophe bonds which cover events solely occurring in Florida. Management deemed this reinsurance protection to be sufficient given the level of catastrophe exposure in 2017 for Alabama, Georgia, North Carolina and South Carolina. In placing our 2017-2018 reinsurance program, we sought to capitalize on favorable reinsurance pricing and mitigate uncertainty surrounding the future cost of our reinsurance by negotiating multi-year arrangements. The $687.5 million of aggregate coverage we purchased from Citrus Re, which included the 2015 Class A, B, and C notes, the 2016 Class D & E notes, and the 2017 Series notes extends $277.5 million of coverage until May 2018, $250.0 million of coverage for two-year period and $160.0 million of coverage for a three-year period. To the extent coverage is all or partially exhausted before the end of three years, it cannot be reinstated. In the aggregate, multi-year coverage from Citrus Re accounted for approximately 26% of our purchases of private reinsurance for the 2017 hurricane season. The terms of each of the multi-year coverage arrangements described above are subject to adjustment depending on, among other things, the size and composition of our portfolio of insured risks in future periods. Per Risk Coverage: The Company also purchased property per risk coverage for losses and loss adjustment expenses in excess of $1.0 million per claim. The limit recovered for an individual loss is $9.0 million and total limit for all losses is $27.0 million. There are two reinstatements available with additional premium due based on the amount of the layer exhausted. In addition, the Company purchased facultative reinsurance in excess of $10.0 million for any commercial properties it insured where the total insured value exceeded $10.0 million. 2017-2018 NBIC Program NBIC, our insurance subsidiary located in Rhode Island, provides property insurance coverage in the states of Connecticut, Massachusetts, New Jersey, New York and Rhode Island. NBIC’s 2017-2018 catastrophe reinsurance program provided coverage for loss occurrences up to $1.0 billion (1:100-year event) on the first event and includes automatic reinstatement protection. The program included coverage for catastrophic events such as severe winter storms, hurricanes and tornadoes. During 2017, NBIC’s net retention for a catastrophic event of up to $1.0 billion was $1.3 million. NBIC’s reinsurance program also covered non-catastrophic losses. A summary of NBIC’s combined reinsurance protection for 2017-2018 follows. The reinsurance program was placed with participation from leading reinsurers across global markets with no one reinsurer exceeding 10%. The reinsurance partners were all rated A- to A+ by Standard and Poor’s. Property Catastrophe Excess of Loss NBIC’s property catastrophe program protected NBIC from the aggregation of losses in a single occurrence. Reinstatement provisions (one reinstatement at 100% of premium) on the first three layers and a portion of the fourth layer provided protection for NBIC from a second catastrophic event. The program was 81.25% placed, with the remaining 18.75% of catastrophe protection coming from NBIC’s gross quota share contract. NBIC’s net retention of $20.0 million was further reduced with a net quota share reinsurance contract described below. Reinstatement Premium Protection NBIC’s Reinstatement Premium Protection locked in the cost of a potential reinstatement premium charge that would occur should an event trigger catastrophe reinsurance. NBIC bought reinstatement premium protection for the first three layers and a portion of the fourth catastrophe excess of loss layers. Aggregate Contract For the year ended December 31, 2017, NBIC had 25% of an aggregate contract, in two sections: • Section 1: $20.0 million excess $21.5 million in the aggregate for all catastrophe losses excluding named tropical storms. • Section 2: $12.0 million excess $8.0 million for named tropical storm losses. NBIC placed 25% of an aggregate contract on December 31, 2017, which expired on May 31, 2018. The limit on the contract was $13.5 million, retention of $18.5 million and franchise deductible of $1.0 million. Gross Quota Share NBIC purchased an 18.75% gross account quota share reinsurance treaty which provides ground up loss recoveries of up to $1.0 billion. Net Lines Quota Share • NBIC’s net lines quota share was proportional reinsurance for which certain of our other reinsurance inures to the quota share (property catastrophe excess of loss and reinstatement premium protection and the second layer of the g

Reserve For Unpaid Losses

Reserve For Unpaid Losses	9 Months Ended
	Sep. 30, 2018
Insurance [Abstract]
Reserve for Unpaid Losses	NOTE 12. RESERVE FOR UNPAID LOSSES The Company determines the reserve for unpaid losses on an individual-case basis for all incidents reported. The liability also includes amounts which are commonly referred to as incurred but not reported, or “IBNR”, claims as of the balance sheet date. The table below summarizes the activity related to the Company’s reserve for unpaid losses for the three and nine months ended September 30, 2018 and 2017: For the Three Months Ended September 30, For the Nine Months Ended September 30, 2018 2017 2018 2017 (In thousands) (In thousands) Balance, beginning of period $ 488,610 $ 122,785 $ 470,083 $ 140,137 Less: reinsurance recoverable on unpaid losses 315,308 2,499 315,353 589 Net balance, beginning of period 173,302 120,286 154,730 139,548 Incurred related to: Current year 61,900 60,436 163,115 155,255 Prior years (3,205 ) 3,599 14,660 1,473 Total incurred 58,695 64,035 177,775 156,728 Paid related to: Current year 19,544 62,842 41,361 102,079 Prior years 17,585 16,198 96,276 88,917 Total paid 37,129 79,040 137,637 190,996 Unpaid claim liabilities from Sawgrass — 15,991 — 15,991 Net balance, end of period 194,868 121,270 194,868 121,270 Plus: reinsurance recoverable on unpaid losses 226,227 368,310 226,227 368,310 Balance, end of period $ 421,095 $ 489,580 $ 421,095 $ 489,580 As of September 30, 2018, we reported $194.9 million in unpaid losses and loss adjustment expenses, net of reinsurance which included $134.1 million attributable to IBNR net of reinsurance recoverable, or 68.8% of net reserves for unpaid losses and loss adjustment expenses (“LAE”). The Company’s losses incurred for the nine months ended September 30, 2018 and 2017 reflect prior year development of $14.7 million and $1.5 million, respectively, associated with management’s best estimate of the actuarial loss and LAE reserves with consideration given to Company specific historical loss experience. Unfavorable development during the nine months ended September 30, 2018 was driven by personal lines litigated claims, particularly for accident years 2016 and 2017. Incurred losses & loss adjusted expenses in the third quarter of 2018 from Hurricane Florence totaled $20.0 million on a gross basis, and approximately $16.0 million, net of reinsurance. NBIC incurred losses in the first quarter of 2018 from seven different winter storms in the northeast, three of which were named storms. Losses, including loss adjustment expense for winter storms during the first quarter of 2018 were approximately $54.3 million on a gross basis and approximately $8.9 million, net of reinsurance .

Long-Term Debt

Long-Term Debt	9 Months Ended
	Sep. 30, 2018
Debt Disclosure [Abstract]
Long-Term Debt	NOTE 13. LONG-TERM DEBT In December 2016, the Company issued $79.5 million of Senior Secured Notes (“Secured Notes”) bearing interest at the three-month LIBOR plus 8.75% per annum. Interest is accrued monthly and paid quarterly. At September 30, 2018, we recognized proceeds of $74.0 million on the issuance of the Secured Notes, net of issuance costs which totaled approximately $5.3 million. During the nine months ended September 30, 2018 and 2017, the Company made interest payments of approximately $6.6 million and $7.0 million, respectively. Quarterly principal payments will commence on December 15, 2018. In August 2017 and September 2017, we issued in aggregate $136.8 million of 5.875% Convertible Senior Notes (“Convertible Notes”) maturing on August 1, 2037, unless earlier repurchased, redeemed or converted. Interest accrues from August 16, 2017 and is payable semi-annually in arrears, on February 1 and August 1 of each year, beginning in 2018. As of September 30, 2018, we recognized proceeds of $90.5 million on the issuance of the Convertible Notes, net of issuance and debt discount costs which totaled approximately, $11.0 million. For the nine months ended September 30, 2018 and 2017, the Company made interest payments of approximately $7.7 million and $0, respectively on the Convertible Notes. In November 2017, we, through our subsidiary Heritage P&C, reacquired $21.1 million of its outstanding Convertible Notes in the open market at a cost of $25.2 million. In April 2018, the Parent Company reacquired $10.6 million of its outstanding Convertible Notes in the open market at a cost of $13.4 million. On August 7, 2018, in connection with the April 2018 settlement of the open market repurchase, the Company retired the repurchased $10.6 million Convertible Notes and recorded a reduction on the notes principal balance. Based on the reacquisitions of the Convertible Notes, the Companies derecognized the related debts and conversion option liabilities. In accordance with the purchase agreement governing the Company’s offer and sale of convertible debt, the Company or its affiliates are prohibited from reselling the notes once acquired. The repurchased Convertible Notes hold no registration rights. Subsequent to September 30, 2018, the Company reacquired $3.1 million of its outstanding Convertible Notes in the open market at a cost of $3.6 million. In October 2017, the Company and its subsidiary, Skye Lane Properties LLC, jointly obtained a commercial real estate mortgage loan in the amount of $12.7 million, bearing interest of 4.95% per annum. The Company makes monthly principal and interest payments against the loan. For the nine months ended September 30, 2018, the Company paid in principal and interest $670,000. The following table summarizes the Company’s long-term debt at September 30, 2018 and December 31, 2017: September 30, 2018 December 31, 2017 (In thousands) Convertible debt $ 105,024 $ 115,624 Mortgage loan 12,462 12,658 Senior Note payable 79,500 79,500 Total principal amount $ 196,986 $ 207,782 Less: unamortized discount and issuance costs Debt discount and issuance cost on convertible debt 13,610 17,605 Debt issuance cost on senior note payable 5,046 5,772 Total long-term debt $ 178,330 $ 184,405

Accounts Payable and Other Liab

Accounts Payable and Other Liabilities	9 Months Ended
	Sep. 30, 2018
Other Liabilities Disclosure [Abstract]
Accounts Payable and Other Liabilities	NOTE 14. ACCOUNTS PAYABLE AND OTHER LIABILITIES Other liabilities consist of the following at September 30, 2018 and December 31, 2017: Description September 30, 2018 December 31, 2017 (In thousands) Deferred ceding commission $ 43,291 $ 51,109 Outstanding claim checks 2,309 79,666 Accounts payable and other payables 13,755 17,948 Accrued interest and issuance costs 757 3,117 Accrued dividends 1,594 — Other liabilities 3,096 5,088 Commission payables 12,958 12,609 Total other liabilities $ 77,760 $ 169,537

Statutory Accounting and Regula

Statutory Accounting and Regulations	9 Months Ended
	Sep. 30, 2018
Text Block [Abstract]
Statutory Accounting and Regulations	NOTE 15. STATUTORY ACCOUNTING AND REGULATIONS State laws and regulations, as well as national regulatory agency requirements, govern the operations of all insurers such as our insurance subsidiaries. The various laws and regulations require that insurers maintain minimum amounts of statutory surplus and risk-based capital, restrict insurers’ ability to pay dividends, restrict the allowable investment types and investment mixes, and subject the Company’s insurers to assessments. The Company’s insurance subsidiaries must maintain capital and surplus ratios or balances as determined by the regulatory authority of the states in which they are domiciled. Heritage P&C is required to maintain capital and surplus equal to the greater of $15 million or 10% of their respective liabilities. Zephyr is required to maintain a deposit of $750,000 in a federally insured financial institution. NBIC is required to maintain capital and surplus of $3.0 million. The combined statutory surplus at September 30, 2018 and December 31, 2017 was $367.8 million and $376.2 million, respectively. On a combined basis, the Company’s insurance subsidiaries reported statutory net loss for the nine months ended September 30, 2018 and 2017 of $71.4 million and $12.9 million, respectively. State law also requires the Company’s insurance subsidiaries to adhere to prescribed premium-to-capital surplus ratios, with which the Company is in compliance. At September 30, 2018, our insurance subsidiaries met the financial and regulatory requirements of the states in which they do business.

Commitments and Contingencies

Commitments and Contingencies	9 Months Ended
	Sep. 30, 2018
Commitments And Contingencies Disclosure [Abstract]
Commitments and Contingencies	NOTE 16. COMMITMENTS AND CONTINGENCIES The Company is involved in claims-related legal actions arising in the ordinary course of business. The Company accrues amounts resulting from claims-related legal actions in unpaid losses and loss adjustment expenses during the period that it determines an unfavorable outcome becomes probable and it can estimate the amounts. Management makes revisions to its estimates based on its analysis of subsequent information that the Company receives regarding various factors, including: (i) per claim information; (ii) company and industry historical loss experience; (iii) judicial decisions and legal developments in the awarding of damages; and (iv) trends in general economic conditions, including the effects of inflation. When determinable, the Company discloses the range of possible losses in excess of those accrued and for reasonably possible losses.

Related Party Transactions

Related Party Transactions	9 Months Ended
	Sep. 30, 2018
Related Party Transactions [Abstract]
Related Party Transactions	NOTE 17. RELATED PARTY TRANSACTIONS In January 2017, the Company entered into a consulting agreement with Mrs. Shannon Lucas, the wife of the Chairman and CEO, in which she agreed to provide consulting services related to the Company’s catastrophe reinsurance and risk management program at a rate of $400 per hour. The consulting agreement has no specific term and either party may terminate the agreement upon providing written notice. Additionally, she serves as a director of Heritage P&C and NBIC with an annual compensation of $150,000. For the nine months ended September 30, 2018 and 2017, the Company paid consulting fees to Ms. Lucas of approximately $575,200 and $371,000, respectively.

Employee Benefit Plan

Employee Benefit Plan	9 Months Ended
	Sep. 30, 2018
Compensation And Retirement Disclosure [Abstract]
Employee Benefit Plan	NOTE 18. EMPLOYEE BENEFIT PLANS The legacy Heritage entities (“Heritage P&C, CAN, HMGA and Zephyr”) provide a 401(k) plan for substantially all employees. A contribution of 100% on the first 3% of employees’ contribution and 50% on the next 2% of the employees’ contribution is made to the plan. The maximum r match is 4%. For the nine-month period ended September 30, 2018 and 2017, the contributions made to the plan on behalf of the participating employees were approximately $515,000 and $478,000, respectively. The Florida-based legacy Heritage entities provide employees a partially self-insured healthcare plan and benefits. For the nine months ended September 30, 2018 and 2017, incurred medical premium costs amounted to an aggregate of $3.0 million and $2.2 million, respectively. An additional liability of approximately $227,000 was recorded for unpaid claims as of September 30, 2018. A stop loss reinsurance policy caps the maximum loss that could be incurred under the self-insured plan. The stop loss coverage per employee is $60,000 for which any excess cost would be covered by the reinsurer subject to an aggregate limit for losses in excess of $1.5 million which would provide up to $1.0 million of coverage. Any excess of the $1.5 million retention and the $1 million of aggregate coverage would be borne by the Florida-based legacy Heritage entities. The aggregate stop loss commences once our expenses exceed 125% of the annual aggregate expected claims. NBIC provides a 401(k) plan for its employees who elect to participate and matches the contributions up to a maximum of 4%. Employer contributions vest 20% each year until fully vested after 5 years. For the nine-month period ended September 30, 2018, NBIC contributions to the plan on behalf of the participating employees were approximately $331,000.

Equity

Equity	9 Months Ended
	Sep. 30, 2018
Equity [Abstract]
Equity	NOTE 19. EQUITY The total amount of authorized capital stock consists of 50,000,000 shares of common stock and 5,000,000 shares of preferred stock. As of September 30, 2018, the Company had 25,769,804 shares of common stock outstanding, 7,214,797 treasury shares of common stock and 830,801 unvested shares of restricted common stock issued reflecting total paid-in capital of $295.5 million as of such date. As more fully disclosed in our audited consolidated financial statements for the year ended December 31, 2017, there were, as of December 31, 2017, 25,885,004 shares of common stock outstanding, 7,099,597 treasury shares of common stock and 675,000 unvested restricted stock grants, representing $294.8 million of additional paid-in capital. Common Stock Holders of common stock are entitled to one vote for each share held on all matters subject to a vote of stockholders, subject to the rights of holders of any outstanding preferred stock. Accordingly, holders of a majority of the shares of common stock entitled to vote in any election of directors may elect all of the directors standing for election, subject to the rights of holders of any outstanding preferred stock. Holders of common stock will be entitled to receive ratably any dividends that the board of directors may declare out of funds legally available therefor, subject to any preferential dividend rights of outstanding preferred stock. Upon the Company’s liquidation, dissolution or winding up, the holders of common stock will be entitled to receive ratably its net assets available after the payment of all debts and other liabilities and subject to the prior rights of holders of any outstanding preferred stock. Holders of common stock have no preemptive, subscription, redemption or conversion rights. There are no redemption or sinking fund provisions applicable to the common stock. All outstanding shares of the Company’s capital stock are fully paid and nonassessable. Stock Repurchase Program On May 4, 2016, the Company announced that the Company’s Board of Directors authorized a stock repurchase program authorizing the Company to repurchase up to $70 million of the Company’s common stock. At December 31, 2017, the Company had purchased in aggregate approximately $47 million in Company’s common stock. During the first quarter of 2018, the Company purchased 115,200 shares of its common stock for $2.0 million. The repurchase plan expired on June 30, 2018. On August 1, 2018, the Company announced that its Board of Directors authorized a stock repurchase program authorizing the Company to repurchase up to $50 million of its common stock through December 31, 2020 under our current Rule 10b5-1 trading plan, which allows the Company to repurchase shares below a predetermined price per share. The timing and amount of any repurchases will be determined based on market conditions and other factors and the program may be discontinued or suspended at any time. Dividends Dividends are paid by the Company only if declared by its Board of Directors out of funds legally available, subject to any other restrictions that may be applicable to the Company. The table below summarizes the quarterly dividends as of September 30, 2018. Quarter Ended March 31, 2018 June 30, 2018 September 30, 2018 Cash dividend per common share $ 0.06 $ 0.06 $ 0.06 Total cash dividends paid $ 1,601,100 $ 1,594,188 $ 1,594,188 Record date March 15, 2018 June 15, 2018 September 15, 2018 Payment date April 3, 2018 July 6, 2018 October 3, 2018 The declaration and payment of any future dividends will be subject to the discretion of the Board of Directors and will depend on a variety of factors including the Company’s financial condition and results of operations.

Stock-Based Compensation

Stock-Based Compensation	9 Months Ended
	Sep. 30, 2018
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]
Stock-Based Compensation	NOTE 20. STOCK-BASED COMPENSATION The Company has adopted the Heritage Insurance Holdings, Inc., Omnibus Incentive Plan (the “Plan”) effective on May 22, 2014. The Plan authorized 2,981,737 shares of common stock for issuance under the Plan for future grants. As of December 31, 2017, all unexercised stock options have been forfeited. At September 30, 2018 and December 31, 2017 there were 1,200,898 and 1,231,699 shares available for grant under the Plan, respectively. The Company recognizes compensation expense under ASC 718 for its stock-based payments based on the fair value of the awards. During the first quarter of 2018, the Company granted 125,000 shares of restricted stock with a fair value of $16.35. The restricted stock vests in equal annual installments over a five-year period. During the third quarter of 2018, the Company granted 30,801 shares of restricted stock with a fair value of $15.08. The restricted stock vests in equal annual installments over a three-year period. The Company grants stock options at exercise prices equal to the fair market value of the Company’s stock on the dates the options are granted. The options have a maximum term of ten years from the date of grant and vest primarily in equal annual installments over a range of one to five-year periods following the date of grant for employee options. If a participant’s employment relationship ends, the participant’s vested awards will remain exercisable for the shorter of a period of 30 days or the period ending on the latest date on which such award could have been exercisable. The fair value of each option grant is separately estimated for each grant date. The fair value of each option is amortized into compensation expense on a straight-line basis between the grant date for the award and each vesting date. The Company estimates the fair value of all stock option awards as of the date of the grant by applying the Black-Scholes-Merton multiple-option pricing valuation model. The application of this valuation model involves assumptions that are judgmental and highly sensitive in the determination of compensation expense. The Company has also granted shares of its common stock subject to certain restrictions under the Plan. Restricted stock awards granted to employees vest in equal installments generally over a five-year period from the grant date subject to the recipient’s continued employment. The fair value of restricted stock awards is estimated by the market price at the date of grant and amortized on a straight-line basis to expense over the period of vesting. Recipients of restricted stock awards have the right to receive dividends. Restricted stock activity for the quarter ended September 30, 2018 is as follows: Weighted-Average Grant-Date Fair Number of shares Value per Share Non-vested, at December 31, 2017 675,000 $ 21.40 Granted 125,000 $ 16.35 Vested — — Canceled and surrendered — — Non-vested, at June 30, 2018 800,000 $ 20.61 Granted 30,801 $ 15.08 Vested — — Canceled and surrendered — — Non-vested, at September 30, 2018 830,801 $ 20.41 Awards are being amortized to expense over the three to five-year vesting period. The Company recognized $3.9 million and $3.6 million of compensation expense for the nine months ended September 30, 2018 and 2017, respectively. There was approximately $12.3 million of unrecognized compensation expense related to the unvested restricted stock at September 30, 2018. The Company expects to recognize the remaining compensation expense over a weighted average period of 2.5 years.

Subsequent Events

Subsequent Events	9 Months Ended
	Sep. 30, 2018
Subsequent Events [Abstract]
Subsequent Events	NOTE 21. SUBSEQUENT EVENTS On October 7, 2018, Hurricane Michael, a Category 4 storm, was the third-most powerful Atlantic hurricane to make landfall as a Category 4 storm that made landfall in the Florida Panhandle and caused substantial damage. It is estimated to have caused over $12.0 billion in damages affecting Florida and Georgia. At this time, through our initial assessment of the event and estimated financial impact, management is projecting gross losses for Michael of at least $25.0 million and anticipates this to be a retention event. The Company will retain the first $10 million and 20% of the next $5.0 million of covered losses incurred as a result of Hurricane Michael. In October 2018, the Company reacquired $2.1 million of its outstanding Convertible Notes in the open market at a cost of $2.5 million. On October 31, 2018, the Company announced that its Board of Directors declared a $0.06 per share quarterly dividend payable on January 4, 2019 to stockholders of record as of December 15, 2018.

Out-Of-Period Adjustment

Out-Of-Period Adjustment	9 Months Ended
	Sep. 30, 2018
Out Of Period Adjustment [Abstract]
Out-Of-Period Adjustment	NOTE 22. OUT OF PERIOD ADJUSTMENT During the third quarter of 2018, the Company identified and corrected an immaterial error related to an inconsistency in the application of its accounting policy to record the 2018-2019 Catastrophe excess of loss reinsurance program for its insurance subsidiary, NBIC, which we acquired on November 30, 2017. The Company’s accounting policy for its reinsurance agreements is to record an asset, prepaid reinsurance premiums, and a liability, reinsurance payable, for the entire contract amount upon commencement of a new reinsurance agreements. The Company amortizes its prepaid reinsurance premiums over the 12-month contract period which incepts June 1 st The effect of this inconsistency in accounting policy affects a balance sheet only for which the correction resulted in an increase to both assets and liabilities. As a result of this inconsistency in application of our accounting policy, the following balance sheet items were impacted at June 30, 2018: • Prepaid reinsurance premiums increased by $51 million ( asset • Reinsurance payable increased by $51 million ( liability The Company updated its corporate accounting policy in July 2018 and made the correction in the third quarter of 2018 recording $39.3 million, net of the third quarter amortized premium amounts to reinsurance payable and prepaid reinsurance premiums. The Company evaluated the effects of this misstatement on the prior period’s consolidated financial statements, individually and in the aggregate, in accordance with the guidance in SEC Staff Bulletins ("SAB") 99, Materiality, SAB 108, Considering the Effects of Prior year Misstatements when Quantifying Misstatements in the Current Year Financial Statements and Accounting Standards Codification 250, Accounting Changes and Error Corrections The omission of the information from the second quarter balance did not have any impact on earnings or equity, as it understated equally the assets and liabilities.

Basis of Presentation and Sig_2

Basis of Presentation and Significant Accounting Policies (Policies)	9 Months Ended
	Sep. 30, 2018
Organization Consolidation And Presentation Of Financial Statements [Abstract]
Basis of Presentation	Basis of Presentation The condensed consolidated financial statements as of and for the three and nine months ended September 30, 2018 and 2017 include Heritage Insurance Holdings, Inc. (“Parent Company”); its property and casualty insurance subsidiaries: Heritage Property & Casualty Insurance Company (“Heritage P&C”), Narragansett Bay Insurance Company (“NBIC”) and Zephyr Insurance Company, Inc. (“Zephyr”); Heritage MGA, LLC, (“HMGA”), the managing general agent that manages substantially all aspects of our Florida insurance subsidiary’s business; Contractors’ Alliance Network, LLC (“CAN”), our claims vendor network manager for Florida that provides restoration, emergency and recovery services; Skye Lane Properties, LLC, our property management subsidiary; First Access Insurance Group, LLC, our retail agency and licensed reinsurance intermediary; Osprey Re Ltd. (“Osprey”), our reinsurance subsidiary that may provide a portion of the reinsurance protection purchased by our insurance subsidiaries; and Heritage Insurance Claims, LLC, an inactive subsidiary reserved for future development. Through our insurance subsidiaries, Heritage P&C, Zephyr and NBIC, we write personal residential insurance for single-family homeowners and condominium owners, and rental property insurance in the states of Alabama, Connecticut, Florida, Georgia, Hawaii, Massachusetts, New Jersey, New York, North Carolina, Rhode Island and South Carolina. We also provide commercial residential insurance for Florida properties and are also licensed in the states of Maryland, Mississippi, Pennsylvania and Virginia. We are vertically integrated and control or manage substantially all aspects of insurance underwriting, customer service, actuarial analysis, distribution and claims processing and adjusting. The condensed consolidated financial information included herein as of and for the three and nine months ended September 30, 2018 and 2017 does not include all of the information and footnotes required by U.S. generally accepted accounting principles (“GAAP”) for complete financial statements. However, such information reflects all adjustments consisting of normal recurring accruals which are, in the opinion of management, necessary for a fair statement of the financial condition and results of operations for the interim periods. The results for the three and nine months ended September 30, 2018 and 2017 are not indicative of annual results. The accompanying unaudited condensed consolidated financial statements have been prepared in accordance with generally accepted accounting principles for interim financial information and with the instructions to Form 10-Q and Article 10 of Regulation S-X. The December 31, 2017 consolidated balance sheet was derived from the Company’s audited consolidated financial statements as of and for the year ended December 31, 2017. For further information, refer to the consolidated financial statements and footnotes thereto included in Heritage Insurance Holdings, Inc.’s Annual Report on Form 10-K for the fiscal year ended December 31, 2017 (the “2017 Form 10-K”). References to “we”, “us”, “our”, or the “Company” refer to Heritage Insurance Holdings, Inc. and its consolidated subsidiaries.
Reclassification	Reclassification We have reclassified certain amounts in the 2017 statement of operations to conform to our 2018 presentation. Additionally, we reclassified certain amounts in the 2017 consolidated statement of cash flows to conform to the 2018 presentation, relating to the presentation of restricted cash and cash equivalents. This reclassification is a result of our adoption of Accounting Standards Update (ASU) 2016-18, Restricted Cash effective January 1, 2018.
Recently Adopted Accounting Pronouncements	Recently Adopted Accounting Pronouncements In February 2018, the FASB issued ASU 2018-02, Income Statement – Reporting Comprehensive Income (Topic 220) The Company early adopted the updated guidance effective January 1, 2018 and elected to reclassify the stranded income tax effects relating to the reduction in the federal corporate income tax rate from AOCI”) to retained earnings at the beginning of the period of adoption. The net impact of the accounting change resulted in a $0.4 million decrease in AOCI comprised of income taxes associated with net unrealized losses on investments and a corresponding increase in retained earnings. In May 2017, the FASB issued ASU No. 2017-09, Compensation–Stock Compensation (Topic 718): Scope of Modification Accounting In January 2017, the FASB issued ASU No. 2017-01, Business Combinations (Topic 805). Clarifying the Definition of a Business, In August 2016, the FASB issued ASU 2016-15, Classification of Certain Cash Receipts and Cash Payments In November 2016, the FASB issued ASU 2016-18, Statement of Cash Flows, In January 2016, the FASB issued ASU 2016-01, Recognition and Measurement of Financial Assets and Financial Liabilities. Technical Corrections and Improvements to Financial Instruments—Overall In May 2014, the FASB issued ASU Topic 2014-09, Revenue from Contracts with Customers Accounting Pronouncements Not Yet Adopted The Company describes below recent pronouncements that may have a significant effect on its consolidated financial statements or on its disclosures upon future adoption. The Company does not discuss recent pronouncements that are not anticipated to have an impact on, or are unrelated to, its financial condition, results of operations, or related disclosures. In August 2018, the FASB issued ASU 2018-12 , Financial Services – Insurance (Topic 944) Targeted Improvements to the Accounting for Long-Duration Contracts In March 2018, the FASB issued ASU 2018-04, Investments-Debt Securities (Topic 320) and Regulated Operations (Topic 980). Investments-Debt Securities Regulated Operations In January 2017, the FASB issued ASU No. 2017-04, Intangibles-Goodwill and Other In June 2016, the FASB issued ASU 2016-13, Financial Instruments – Credit Losses Measurement of Credit Losses on Financial Instruments In February 2016, the FASB issued ASU 2016-02 (as subsequently amended by ASU 2018 - 01, ASU 2018 - 10 and ASU 2018 - 11) Lease Accounting, requires that a lessee recognize in the statement of financial position a liability to make lease payments (the lease liability) and a right-of-use asset representing its right to use the underlying asset for the lease term. For leases with a term of 12 months or less, a lessee is permitted to make an accounting policy election by class of underlying asset not to recognize lease assets and lease liabilities. As with previous guidance, there continues to be a differentiation between finance leases and operating leases, however this distinction now primarily relates to differences in the manner of expense recognition over time and in the classification of lease payments in the statement of cash flows. Lease assets and liabilities arising from both finance and operating leases will be recognized in the statement of financial position. ASU 2016 - 02 leaves the accounting for leases by lessors largely unchanged from previous GAAP. The transitional guidance for adopting the requirements of ASU 2016 - 02 calls for a modified retrospective approach that includes a number of optional practical expedients that entities may elect to apply. In addition, ASU 2018 - 11 provides for an additional (and optional) transition method by which entities may elect to initially apply the transition requirements in Topic 842 at that Topic’s effective date with the effects of initially applying Topic 842 recognized as a cumulative effect adjustment to the opening balance of retained earnings in the period of adoption and without retrospective application to any comparative prior periods presented. To date, we have taken an inventory of all our operating leases, which consist primarily of auto, equipment and real estate owned and unowned by the Company, started our review of key lease agreements, including contract review for embedded leases, and are currently evaluating lease terms, lease payments and appropriate discount rates to use in calculating the right-to-use asset and lease liability. At September 30, 2018, the Company estimated its lease obligations subject to the new accounting guidance to be in aggregate of $5.2 million with lease terms ranging from 5 to 10 years. In addition, we are currently evaluating the transition package of practical expedients permitted within the new standard, which among other things, allows us to use hindsight to determine the reasonably certain lease term for existing leases, and allows for the adoption of the new standard at the effective date without adjusting the comparative prior periods presented. We will be continuously assessing the impact of the new standard and the impact on our systems, processes and controls through January 1, 2019, our planned adoption date. There are no other recently issued accounting standards that apply to the Company or that are expected to have a material impact on the Company’s results of operations, financial condition, or cash flows.

Acquisition (Tables)

Acquisition (Tables)	9 Months Ended
	Sep. 30, 2018
Business Combinations [Abstract]
Summary of Pro Forma Information	The following unaudited pro forma results of operations assume that the NBIC acquisition occurred at the beginning of the periods presented. The pro forma amounts include certain adjustments, including depreciation and amortization expense and income taxes. The unaudited pro forma information assumes the acquisition had taken place January 1, 2017. The unaudited pro forma effects for the three and nine months ended September 30, 2017 is as follows: For the Three Months Ended September 30, 2017 For the Nine Months Ended September 30, 2017 (In thousands, except per share) Revenue $ 176,123 $ 401,061 Net (loss) income $ (2,732 ) $ 14,662 Basic, (loss) earnings per share $ (0.12 ) $ 0.49 Diluted, (loss) earnings per share $ (0.12 ) $ 0.49

Investments (Tables)

Investments (Tables)	9 Months Ended
	Sep. 30, 2018
Investments Debt And Equity Securities [Abstract]
Schedule of Amortized Cost and Fair Value of Investment Securities	The following table details the difference between cost or adjusted/amortized cost and estimated fair value, by major investment category, at September 30, 2018 and December 31, 2017: Cost or Adjusted / Amortized Cost Gross Gains Gross Losses Fair Value (In thousands) September 30, 2018 U.S. government and agency securities $ 46,934 $ 2 $ 1,051 $ 45,885 States, municipalities and political subdivisions 61,672 — 1,527 60,145 Special revenue 261,799 10 6,316 255,493 Industrial and miscellaneous 152,884 27 3,560 149,351 Redeemable preferred stocks 4,850 6 189 4,667 Total fixed maturities 528,139 45 12,643 515,541 Nonredeemable preferred stocks 13,808 17 654 13,171 Equity securities 3,098 37 597 2,538 Total equity securities 16,906 54 1,251 15,709 Total investments $ 545,045 $ 99 $ 13,894 $ 531,250 Cost or Adjusted / Amortized Cost Gross Unrealized Gains Gross Unrealized Losses Fair Value (In thousands) December 31, 2017 U.S. government and agency securities $ 39,445 $ 7 $ 572 $ 38,880 States, municipalities and political subdivisions 76,876 104 569 76,411 Special revenue 269,277 524 2,124 267,677 Industrial and miscellaneous 162,093 668 633 162,128 Redeemable preferred stocks 4,767 4 71 4,700 Total fixed maturities 552,458 1,307 3,969 549,796 Nonredeemable preferred stocks 14,450 69 195 14,324 Equity securities 3,098 64 269 2,893 Total equity securities 17,548 133 464 17,217 Total investments $ 570,006 $ 1,440 $ 4,433 $ 567,013
Schedule of Net Realized (Losses) Gains by Major Investment Category	The Company calculates the gain or loss realized on the sale of investments by comparing the sales price (fair value) to the cost or adjusted/amortized cost of the security sold. The Company determines the cost or adjusted/amortized cost of the security sold using the specific-identification method. The following tables detail the Company’s net realized (losses) gains by major investment category for the three and nine months ended September 30, 2018 and 2017, respectively: 2018 2017 Gains (Losses) Fair Value at Sale Gains (Losses) Fair Value at Sale (In thousands) For the Three Months Ended September 30, Fixed maturities $ — $ 25 $ 413 $ 253,673 Equity securities 15 — 1,260 16,454 Total realized gains 15 25 1,673 270,127 Fixed maturities (3 ) 262 (23 ) 26,602 Equity securities (7 ) — (1,285 ) 6,781 Total realized losses (10 ) 262 (1,308 ) 33,383 Net realized gains $ 5 $ 287 $ 365 $ 303,510 2018 2017 Gains (Losses) Fair Value at Sale Gains (Losses) Fair Value at Sale (In thousands) For the Nine Months Ended September 30, Fixed maturities $ 76 $ 26,860 $ 448 $ 463,538 Equity securities 1 169 2,231 22,848 Total realized gains 77 27,029 2,679 486,386 Fixed maturities (230 ) 48,774 (197 ) 40,192 Equity securities (154 ) 4,146 (1,471 ) 10,610 Total realized losses (384 ) 52,920 (1,668 ) 50,802 Net realized (losses) gains $ (307 ) $ 79,949 $ 1,011 $ 537,188
Schedule of Amortized Cost and Fair Value of Investment Securities by Contractual Maturity	The table below summarizes the Company’s fixed maturities at September 30, 2018 by contractual maturity periods. Actual results may differ as issuers may have the right to call or prepay obligations, with or without penalties, prior to the contractual maturity of those obligations. September 30, 2018 Cost or Amortized Cost Percent of Total Fair Value Percent of Total (In thousands) (In thousands) Due in one year or less $ 38,062 7 % $ 37,938 7 % Due after one year through five years 180,415 34 % 177,487 35 % Due after five years through ten years 135,420 26 % 130,345 25 % Due after ten years 174,242 33 % 169,771 33 % Total $ 528,139 100 % $ 515,541 100 %
Summary of Net Investment Income	The following table summarizes the Company’s net investment income by major investment category for the three and nine months ended September 30, 2018 and 2017, respectively: For the Three Months Ended September 30, For the Nine Months Ended September 30, 2018 2017 2018 2017 (In thousands) Fixed maturities $ 3,020 $ 2,479 $ 8,018 $ 7,640 Equity securities 547 479 1,252 1,458 Cash, cash equivalents and short-term investments 284 441 861 544 Other investments 425 (24 ) 1,168 (24 ) Net investment income 4,276 3,375 11,299 9,618 Investment expenses 429 640 1,595 1,408 Net investment income, less investment expenses $ 3,847 $ 2,735 $ 9,704 $ 8,210
Aging of Gross Unrealized Investment Losses	The following tables present an aging of our unrealized investment losses by investment class as of September 30, 2018 and December 31, 2017: Less Than Twelve Months Twelve Months or More Number of Securities Gross Unrealized Losses Fair Value Number of Securities Gross Unrealized Losses Fair Value (In thousands) September 30, 2018 U.S. government and agency securities 37 $ 192 $ 24,926 55 $ 859 $ 20,142 States, municipalities and political subdivisions 40 799 33,062 21 729 22,737 Industrial and miscellaneous 370 2,917 125,982 80 643 15,023 Special revenue 237 3,308 129,251 242 3,007 73,062 Redeemable preferred stocks 52 507 2,935 35 147 1,389 Total fixed maturities 736 7,723 316,156 433 5,385 132,353 Nonredeemable preferred stocks 188 127 10,934 11 62 801 Equity securities 15 187 817 15 410 1,105 Total equity securities 203 $ 314 $ 11,751 26 $ 472 $ 1,906 Total 939 $ 8,037 $ 327,907 459 $ 5,857 $ 134,259 Less Than Twelve Months Twelve Months or More Number Gross Losses Fair Number of Securities Gross Unrealized Losses Fair Value (In thousands) December 31, 2017 U.S. government and agency securities 53 $ 284 $ 20,053 24 $ 289 $ 9,294 States, municipalities and political subdivisions 51 359 49,803 8 210 10,503 Industrial and miscellaneous 284 376 87,898 38 256 11,788 Special revenue 295 777 133,580 183 1,347 69,359 Redeemable preferred stocks 41 66 3,987 17 5 61 Total fixed maturities 724 1,862 295,321 270 2,107 101,005 Nonredeemable preferred stocks 127 188 10,047 6 7 159 Equity securities 11 46 677 12 223 1,095 Total equity securities 138 $ 234 $ 10,724 18 $ 230 $ 1,254 Total 862 $ 2,096 $ 306,045 288 $ 2,337 $ 102,259

Fair Value of Financial Instr_2

Fair Value of Financial Instruments (Tables)	9 Months Ended
	Sep. 30, 2018
Fair Value Disclosures [Abstract]
Schedule of Fair Value of Financial Instruments	The following table presents information about the Company’s assets measured at fair value on a recurring basis. The Company assesses the levels for the investments at each measurement date, and transfers between levels are recognized on the actual date of the event or change in circumstances that caused the transfer in accordance with the Company’s accounting policy regarding the recognitions of transfers between levels of the fair value hierarchy. At September 30, 2018 and December 31, 2017, there were no transfers in or out of Level 1, 2, and 3. September 30, 2018 Total Level 1 Level 2 Level 3 (In thousands) Fixed maturities investments: U.S. government and agency securities $ 45,885 $ 350 $ 45,535 $ — States, municipalities and political subdivisions 60,145 — 60,145 — Special revenue 255,493 — 255,493 — Industrial and miscellaneous 149,351 — 149,351 — Redeemable preferred stocks 4,667 4,667 — — Total fixed maturities investments $ 515,541 $ 5,017 $ 510,524 $ — Nonredeemable preferred stocks 13,171 13,171 — — Equity securities 2,538 2,538 — — Total equity securities $ 15,709 $ 15,709 $ — $ — Total investments $ 531,250 $ 20,726 $ 510,524 $ — December 31, 2017 Total Level 1 Level 2 Level 3 (In thousands) Fixed maturities investments: U.S. government and agency securities $ 38,880 $ 359 $ 38,521 $ — States, municipalities and political subdivisions 76,411 — 76,411 — Special revenue 267,677 — 267,677 — Industrial and miscellaneous 162,128 — 162,128 — Redeemable preferred stocks 4,700 — 4,700 — Total fixed maturities investments $ 549,796 $ 359 $ 549,437 $ — Nonredeemable preferred stocks 14,324 14,324 — — Equity securities 2,893 2,893 — — Total equity securities $ 17,217 $ 17,217 $ — $ — Total investments $ 567,013 $ 17,576 $ 549,437 $ —

Other Comprehensive Income (L_2

Other Comprehensive Income (Loss) (Tables)	9 Months Ended
	Sep. 30, 2018
Comprehensive Income Net Of Tax [Abstract]
Summary of Other Comprehensive Income (Loss) and Tax Impact of Each Component of Other Comprehensive Income	The following table is a summary of other comprehensive income (loss) and discloses the tax impact of each component of other comprehensive income for the three and nine months ended September 30, 2018 and 2017, respectively: For the Three Months Ended September 30, 2018 2017 Pre-tax Tax After-tax Pre-tax Tax After-tax (In thousands) Other comprehensive (loss) income Change in unrealized losses on investments, net $ (2,895 ) $ 1,666 $ (1,229 ) $ 593 $ (158 ) $ 435 Reclassification adjustment of realized losses (gains) included in net income (5 ) (1 ) (6 ) (365 ) 77 (288 ) Effect on other comprehensive (loss) income $ (2,900 ) $ 1,665 $ (1,235 ) $ 228 $ (81 ) $ 147 For the Nine Months Ended September 30, 2018 2017 Pre-tax Tax After-tax Pre-tax Tax After-tax (In thousands) Other comprehensive (loss) income Change in unrealized losses on investments, net $ (9,918 ) $ 3,185 $ (6,733 ) $ 8,473 $ (3,078 ) $ 5,395 Reclassification adjustment of realized losses (gains) included in net income 307 64 371 (1,011 ) 212 (799 ) Effect on other comprehensive (loss) income $ (9,611 ) $ 3,249 $ (6,362 ) $ 7,462 $ (2,866 ) $ 4,596

Property and Equipment, Net (Ta

Property and Equipment, Net (Tables)	9 Months Ended
	Sep. 30, 2018
Property Plant And Equipment [Abstract]
Schedule of Property and Equipment, Net	Property and equipment, net consisted of the following at September 30, 2018 and December 31, 2017: September 30, 2018 December 31, 2017 (In thousands) Land $ 2,582 $ 2,582 Building 12,102 12,148 Computer hardware and software 4,519 4,093 Office furniture and equipment 1,058 759 Tenant and leasehold improvements 4,341 3,660 Vehicle fleet 880 815 Total, at cost 25,482 24,057 Less: accumulated depreciation and amortization 7,002 5,309 Property and equipment, net $ 18,480 $ 18,748

Goodwill and Other Intangible_2

Goodwill and Other Intangible Assets (Tables)	9 Months Ended
	Sep. 30, 2018
Goodwill And Intangible Assets Disclosure [Abstract]
Schedule of Goodwill	Goodwill (In thousands) Balance as of December 31, 2017 $ 152,459 Goodwill acquired — Impairment — Balance as of September 30, 2018 $ 152,459
Schedule of Estimated Amortization of Intangible Assets	Estimated annual pretax amortization of intangible assets for each of the next five years and thereafter is as follows (in thousands): Year Amount (1) 2018 remaining $ 5,060 2019 $ 8,208 2020 $ 6,365 2021 $ 6,351 2022 $ 6,351 2023 $ 6,351 Thereafter $ 41,910 Total $ 80,596 (1) Excludes insurance licenses valued at $1.3 million and classified as an indefinite lived intangible which is subject to annual impairment testing and not amortized.

Earnings Per Share (Tables)

Earnings Per Share (Tables)	9 Months Ended
	Sep. 30, 2018
Earnings Per Share [Abstract]
Schedule of Computation of Basic and Diluted Earnings (Loss) Per Share (EPS)	The following table sets forth the computation of basic and diluted earnings (loss) per share (“EPS”) for the periods indicated. For the Three Months Ended September 30, For the Nine Months Ended September 30, 2018 2017 2018 2017 Basic earnings (loss) per share: Net income (loss) attributable to common stockholders (000's) $ 5,989 $ (8,696 ) $ 23,227 $ 3,929 Weighted average shares outstanding 25,631,871 25,883,267 25,663,415 27,647,146 Basic earnings (loss) per share: $ 0.23 $ (0.34 ) $ 0.91 $ 0.14 Diluted earnings (loss) per share: Net income (loss) attributable to common stockholders (000's) $ 5,989 $ (8,696 ) $ 23,227 $ 3,929 Weighted average shares outstanding 25,631,871 25,883,267 25,663,415 27,647,146 Weighted average dilutive shares 415,067 — 677,344 — Total weighted average dilutive shares 26,046,938 25,883,267 26,340,759 27,647,146 Diluted earnings (loss) per share: $ 0.23 $ (0.34 ) $ 0.88 $ 0.14

Deferred Policy Acquisition C_2

Deferred Policy Acquisition Costs (Tables)	9 Months Ended
	Sep. 30, 2018
Insurance [Abstract]
Schedule of Activity of DPCC	The table below represents the activity with regard to DPCC during the three and nine months ended September 30, 2018 and 2017: For the Three Months Ended September 30, For the Nine Months Ended September 30, 2018 2017 2018 2017 (In thousands) Beginning balance of deferred ceding commission income $ 42,666 $ — $ 42,665 $ — Ceding commission deferred 18,932 — 56,495 — Less: ceding commission earned (18,307 ) — (55,869 ) — Ending balance of deferred ceding commission income $ 43,291 $ — $ 43,291 $ —
Summary of Activity in Deferred Policy Acquisition Costs (DPAC)	The table below depicts the activity with regard to DPAC during the three and nine months ended September 30, 2018 and 2017: For the Three Months Ended September 30, For the Nine Months Ended September 30, 2018 2017 2018 2017 (In thousands) Beginning Balance $ 69,648 $ 41,792 $ 41,678 $ 42,779 Policy acquisition costs deferred 12,108 21,002 68,048 65,195 Amortization (6,054 ) (20,906 ) (34,024 ) (66,086 ) Ending Balance $ 75,702 $ 41,888 $ 75,702 $ 41,888

Income Taxes (Tables)

Income Taxes (Tables)	9 Months Ended
	Sep. 30, 2018
Income Tax Disclosure [Abstract]
Components of Deferred Tax Assets (Liabilities)	The table below summarizes the significant components of our net deferred tax assets (liabilities): September 30, 2018 December 31, 2017 Deferred tax assets: (In thousands) Unearned premiums $ 10,780 $ 12,488 Unearned commission 10,417 11,987 Net operating loss — 4,727 Tax-related discount on loss reserve 1,486 1,250 Unrealized loss 3,347 — Stock-based compensation 1,126 — Prepaid expenses 2,214 1,950 Other 1,429 331 Total deferred tax asset 30,799 32,733 Deferred tax liabilities: Deferred acquisition costs 18,216 9,775 Prepaid expenses 342 27,568 Unrealized gains — 30 Property and equipment 452 — Note discount 2,498 3,818 Basis in purchased investments 179 335 Basis in purchased intangibles 19,518 24,250 Other 1,557 1,290 Total deferred tax liabilities 42,762 67,066 Net deferred tax liability $ (11,963 ) $ (34,333 )

Reserve for Unpaid Losses (Tabl

Reserve for Unpaid Losses (Tables)	9 Months Ended
	Sep. 30, 2018
Insurance [Abstract]
Summary of Reserve for Unpaid Losses	The table below summarizes the activity related to the Company’s reserve for unpaid losses for the three and nine months ended September 30, 2018 and 2017: For the Three Months Ended September 30, For the Nine Months Ended September 30, 2018 2017 2018 2017 (In thousands) (In thousands) Balance, beginning of period $ 488,610 $ 122,785 $ 470,083 $ 140,137 Less: reinsurance recoverable on unpaid losses 315,308 2,499 315,353 589 Net balance, beginning of period 173,302 120,286 154,730 139,548 Incurred related to: Current year 61,900 60,436 163,115 155,255 Prior years (3,205 ) 3,599 14,660 1,473 Total incurred 58,695 64,035 177,775 156,728 Paid related to: Current year 19,544 62,842 41,361 102,079 Prior years 17,585 16,198 96,276 88,917 Total paid 37,129 79,040 137,637 190,996 Unpaid claim liabilities from Sawgrass — 15,991 — 15,991 Net balance, end of period 194,868 121,270 194,868 121,270 Plus: reinsurance recoverable on unpaid losses 226,227 368,310 226,227 368,310 Balance, end of period $ 421,095 $ 489,580 $ 421,095 $ 489,580

Long-Term Debt (Tables)

Long-Term Debt (Tables)	9 Months Ended
	Sep. 30, 2018
Debt Disclosure [Abstract]
Schedule of Company's Long-Term Debt	The following table summarizes the Company’s long-term debt at September 30, 2018 and December 31, 2017: September 30, 2018 December 31, 2017 (In thousands) Convertible debt $ 105,024 $ 115,624 Mortgage loan 12,462 12,658 Senior Note payable 79,500 79,500 Total principal amount $ 196,986 $ 207,782 Less: unamortized discount and issuance costs Debt discount and issuance cost on convertible debt 13,610 17,605 Debt issuance cost on senior note payable 5,046 5,772 Total long-term debt $ 178,330 $ 184,405

Accounts Payable and Other Li_2

Accounts Payable and Other Liabilities (Tables)	9 Months Ended
	Sep. 30, 2018
Other Liabilities Disclosure [Abstract]
Schedule of Other Liabilities	Other liabilities consist of the following at September 30, 2018 and December 31, 2017: Description September 30, 2018 December 31, 2017 (In thousands) Deferred ceding commission $ 43,291 $ 51,109 Outstanding claim checks 2,309 79,666 Accounts payable and other payables 13,755 17,948 Accrued interest and issuance costs 757 3,117 Accrued dividends 1,594 — Other liabilities 3,096 5,088 Commission payables 12,958 12,609 Total other liabilities $ 77,760 $ 169,537

Equity (Tables)

Equity (Tables)	9 Months Ended
	Sep. 30, 2018
Equity [Abstract]
Summary of Cash Dividends	The table below summarizes the quarterly dividends as of September 30, 2018. Quarter Ended March 31, 2018 June 30, 2018 September 30, 2018 Cash dividend per common share $ 0.06 $ 0.06 $ 0.06 Total cash dividends paid $ 1,601,100 $ 1,594,188 $ 1,594,188 Record date March 15, 2018 June 15, 2018 September 15, 2018 Payment date April 3, 2018 July 6, 2018 October 3, 2018

Stock-Based Compensation (Table

Stock-Based Compensation (Tables)	9 Months Ended
	Sep. 30, 2018
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]
Schedule of Restricted Stock Activity	Restricted stock activity for the quarter ended September 30, 2018 is as follows: Weighted-Average Grant-Date Fair Number of shares Value per Share Non-vested, at December 31, 2017 675,000 $ 21.40 Granted 125,000 $ 16.35 Vested — — Canceled and surrendered — — Non-vested, at June 30, 2018 800,000 $ 20.61 Granted 30,801 $ 15.08 Vested — — Canceled and surrendered — — Non-vested, at September 30, 2018 830,801 $ 20.41

Basis of Presentation And Sig_3

Basis of Presentation And Significant Accounting Policies - Additional Information (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Sep. 30, 2018	Dec. 31, 2017	Sep. 30, 2017
Basis Of Presentation And Significant Accounting Policies [Line Items]
Restricted cash		$ 12,250	$ 20,833
Recognition of net pre-tax unrealized loss on equity investments	$ 400
Operating lease liability obligations		$ 5,200
Minimum [Member]
Basis Of Presentation And Significant Accounting Policies [Line Items]
Lease terms		5 years
Maximum [Member]
Basis Of Presentation And Significant Accounting Policies [Line Items]
Lease terms		10 years
Retained Earnings [Member]
Basis Of Presentation And Significant Accounting Policies [Line Items]
Cumulative effect of new accounting standard on unrealized loss on equity investments			(267)
Accumulated Other Comprehensive Loss [Member]
Basis Of Presentation And Significant Accounting Policies [Line Items]
Cumulative effect of new accounting standard on unrealized loss on equity investments			$ 267
ASU 2018-02 [Member] | Retained Earnings [Member]
Basis Of Presentation And Significant Accounting Policies [Line Items]
Cumulative effect of new accounting standard on unrealized loss on equity investments		$ 400
ASU 2018-02 [Member] | Accumulated Other Comprehensive Loss [Member]
Basis Of Presentation And Significant Accounting Policies [Line Items]
Cumulative effect of new accounting standard on unrealized loss on equity investments		$ (400)
ASU 2016-18 [Member]
Basis Of Presentation And Significant Accounting Policies [Line Items]
Restricted cash				$ 20,900

Acquisition - Additional Inform

Acquisition - Additional Information (Detail) - USD ($)	Nov. 30, 2017	Sep. 30, 2018	Dec. 31, 2017
Business Acquisition [Line Items]
Goodwill		$ 152,459,000	$ 152,459,000
NBIC Holdings, Inc [Member]
Business Acquisition [Line Items]
Purchase price	$ 250,000,000
Purchase price for the acquisition in cash	$ 210,000,000
Issuance of common stock for business acquisition, number of restricted common shares	2,222,215
Purchase price for the acquisition, common stock aggregate value	$ 40,000,000
Goodwill	106,000,000
Goodwill, expected to be deductible for income tax purposes	$ 0

Acquisition - Summary of Pro Fo

Acquisition - Summary of Pro Forma Information (Detail) - NBIC Holdings, Inc [Member] - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended	9 Months Ended
	Sep. 30, 2017	Sep. 30, 2017
Business Acquisition [Line Items]
Revenue	$ 176,123	$ 401,061
Net (loss) income	$ (2,732)	$ 14,662
Basic, (loss) earnings per share	$ (0.12)	$ 0.49
Diluted, (loss) earnings per share	$ (0.12)	$ 0.49

Investments - Schedule of Amort

Investments - Schedule of Amortized Cost and Fair Value of Investment Securities (Detail) - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017
Schedule of Available-for-sale Securities [Line Items]
Cost or Adjusted / Amortized Cost	$ 528,139	$ 552,458
Gross Unrealized Gains	99	1,440
Gross Unrealized Losses	13,894	4,433
Fair Value	531,250	567,013
Investments	545,045	570,006
Fair Value	531,250	567,013
Fixed Maturities Excluding Certificate of Deposits [Member]
Schedule of Available-for-sale Securities [Line Items]
Cost or Adjusted / Amortized Cost	528,139	552,458
Gross Unrealized Gains	45	1,307
Gross Unrealized Losses	12,643	3,969
Fair Value	515,541	549,796
Equity Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Cost or Adjusted / Amortized Cost	16,906	17,548
Gross Unrealized Gains	54	133
Gross Unrealized Losses	1,251	464
Fair Value	15,709	17,217
U.S. government and agency securities [Member] | Fixed Maturity [Member]
Schedule of Available-for-sale Securities [Line Items]
Cost or Adjusted / Amortized Cost	46,934	39,445
Gross Unrealized Gains	2	7
Gross Unrealized Losses	1,051	572
Fair Value	45,885	38,880
States, Municipalities and Political Subdivisions [Member] | Fixed Maturity [Member]
Schedule of Available-for-sale Securities [Line Items]
Cost or Adjusted / Amortized Cost	61,672	76,876
Gross Unrealized Gains		104
Gross Unrealized Losses	1,527	569
Fair Value	60,145	76,411
Special Revenue [Member] | Fixed Maturity [Member]
Schedule of Available-for-sale Securities [Line Items]
Cost or Adjusted / Amortized Cost	261,799	269,277
Gross Unrealized Gains	10	524
Gross Unrealized Losses	6,316	2,124
Fair Value	255,493	267,677
Industrial and Miscellaneous [Member] | Fixed Maturity [Member]
Schedule of Available-for-sale Securities [Line Items]
Cost or Adjusted / Amortized Cost	152,884	162,093
Gross Unrealized Gains	27	668
Gross Unrealized Losses	3,560	633
Fair Value	149,351	162,128
Redeemable Preferred Stocks [Member] | Fixed Maturity [Member]
Schedule of Available-for-sale Securities [Line Items]
Cost or Adjusted / Amortized Cost	4,850	4,767
Gross Unrealized Gains	6	4
Gross Unrealized Losses	189	71
Fair Value	4,667	4,700
Nonredeemable Preferred Stocks [Member] | Equity Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Cost or Adjusted / Amortized Cost	13,808	14,450
Gross Unrealized Gains	17	69
Gross Unrealized Losses	654	195
Fair Value	13,171	14,324
Common Stock [Member] | Equity Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Cost or Adjusted / Amortized Cost	3,098	3,098
Gross Unrealized Gains	37	64
Gross Unrealized Losses	597	269
Fair Value	$ 2,538	$ 2,893

Investments - Schedule of Net R

Investments - Schedule of Net Realized (Losses) Gains by Major Investment Category (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Schedule of Available-for-sale Securities [Line Items]
Total realized gains	$ 15	$ 1,673	$ 77	$ 2,679
Total realized losses	(10)	(1,308)	(384)	(1,668)
Net realized (losses) gains	5	365	(307)	1,011
Total realized gains Fair Value at Sale	25	270,127	27,029	486,386
Total realized losses Fair Value at Sale	262	33,383	52,920	50,802
Net realized (losses) gains, Fair Value at Sale	287	303,510	79,949	537,188
Fixed Maturity [Member]
Schedule of Available-for-sale Securities [Line Items]
Total realized gains		413	76	448
Total realized losses	(3)	(23)	(230)	(197)
Total realized gains Fair Value at Sale	25	253,673	26,860	463,538
Total realized losses Fair Value at Sale	262	26,602	48,774	40,192
Equity Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Total realized gains	15	1,260	1	2,231
Total realized losses	$ (7)	(1,285)	(154)	(1,471)
Total realized gains Fair Value at Sale		16,454	169	22,848
Total realized losses Fair Value at Sale		$ 6,781	$ 4,146	$ 10,610

Investments - Schedule of Amo_2

Investments - Schedule of Amortized Cost and Fair Value of Investment Securities by Contractual Maturity (Detail) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2018	Dec. 31, 2017
Investments Debt And Equity Securities [Abstract]
Due in one year or less, Cost or Amortized Cost	$ 38,062
Due after one year through five years, Cost or Amortized Cost	180,415
Due after five years through ten years, Cost or Amortized Cost	135,420
Due after ten years, Cost or Amortized Cost	174,242
Cost or Adjusted / Amortized Cost	$ 528,139	$ 552,458
Due in one year or less, Percentage of Total	7.00%
Due after one year through five years, Percentage of Total	34.00%
Due after five years through ten years, Percentage of Total	26.00%
Due after ten years, Percentage of Total	33.00%
Total, Percentage	100.00%
Due in one year or less, Fair Value	$ 37,938
Due after one year through five years, Fair Value	177,487
Due after five years through ten years, Fair Value	130,345
Due after ten years, Fair Value	169,771
Total, Fair Value	$ 515,541	$ 549,796
Due in one year or less, Percentage of Total	7.00%
Due after one year through five years, Percentage of Total	35.00%
Due after five years through ten years, Percentage of Total	25.00%
Due after ten years, Percentage of Total	33.00%
Total, Percentage	100.00%

Investments - Summary of Net In

Investments - Summary of Net Investment Income (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Schedule of Available-for-sale Securities [Line Items]
Gross investment income (loss)	$ 4,276	$ 3,375	$ 11,299	$ 9,618
Investment expenses	429	640	1,595	1,408
Net investment income, less investment expenses	3,847	2,735	9,704	8,210
Fixed Maturity [Member]
Schedule of Available-for-sale Securities [Line Items]
Gross investment income (loss)	3,020	2,479	8,018	7,640
Equity Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Gross investment income (loss)	547	479	1,252	1,458
Cash and Cash Equivalents [Member]
Schedule of Available-for-sale Securities [Line Items]
Gross investment income (loss)	284	441	861	544
Other Investments [Member]
Schedule of Available-for-sale Securities [Line Items]
Gross investment income (loss)	$ 425	$ (24)	$ 1,168	$ (24)

Investments - Aging of Gross Un

Investments - Aging of Gross Unrealized Investment Losses (Detail) $ in Thousands	Sep. 30, 2018USD ($)Security	Dec. 31, 2017USD ($)Security
Schedule of Available-for-sale Securities [Line Items]
Number of Securities, Less Than Twelve Months | Security	939	862
Gross Unrealized Losses, Less Than Twelve Months	$ 8,037	$ 2,096
Fair Value, Less Than Twelve Months	$ 327,907	$ 306,045
Number of Securities, Twelve Months or Greater | Security	459	288
Gross Unrealized Losses, Twelve Months or Greater	$ 5,857	$ 2,337
Fair Value, Twelve Months or Greater	$ 134,259	$ 102,259
Fixed Maturity [Member]
Schedule of Available-for-sale Securities [Line Items]
Number of Securities, Less Than Twelve Months | Security	736	724
Gross Unrealized Losses, Less Than Twelve Months	$ 7,723	$ 1,862
Fair Value, Less Than Twelve Months	$ 316,156	$ 295,321
Number of Securities, Twelve Months or Greater | Security	433	270
Gross Unrealized Losses, Twelve Months or Greater	$ 5,385	$ 2,107
Fair Value, Twelve Months or Greater	$ 132,353	$ 101,005
Equity Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Number of Securities, Less Than Twelve Months | Security	203	138
Gross Unrealized Losses, Less Than Twelve Months	$ 314	$ 234
Fair Value, Less Than Twelve Months	$ 11,751	$ 10,724
Number of Securities, Twelve Months or Greater | Security	26	18
Gross Unrealized Losses, Twelve Months or Greater	$ 472	$ 230
Fair Value, Twelve Months or Greater	$ 1,906	$ 1,254
U.S. government and agency securities [Member] | Fixed Maturity [Member]
Schedule of Available-for-sale Securities [Line Items]
Number of Securities, Less Than Twelve Months | Security	37	53
Gross Unrealized Losses, Less Than Twelve Months	$ 192	$ 284
Fair Value, Less Than Twelve Months	$ 24,926	$ 20,053
Number of Securities, Twelve Months or Greater | Security	55	24
Gross Unrealized Losses, Twelve Months or Greater	$ 859	$ 289
Fair Value, Twelve Months or Greater	$ 20,142	$ 9,294
States, Municipalities and Political Subdivisions [Member] | Fixed Maturity [Member]
Schedule of Available-for-sale Securities [Line Items]
Number of Securities, Less Than Twelve Months | Security	40	51
Gross Unrealized Losses, Less Than Twelve Months	$ 799	$ 359
Fair Value, Less Than Twelve Months	$ 33,062	$ 49,803
Number of Securities, Twelve Months or Greater | Security	21	8
Gross Unrealized Losses, Twelve Months or Greater	$ 729	$ 210
Fair Value, Twelve Months or Greater	$ 22,737	$ 10,503
Special Revenue [Member] | Fixed Maturity [Member]
Schedule of Available-for-sale Securities [Line Items]
Number of Securities, Less Than Twelve Months | Security	237	295
Gross Unrealized Losses, Less Than Twelve Months	$ 3,308	$ 777
Fair Value, Less Than Twelve Months	$ 129,251	$ 133,580
Number of Securities, Twelve Months or Greater | Security	242	183
Gross Unrealized Losses, Twelve Months or Greater	$ 3,007	$ 1,347
Fair Value, Twelve Months or Greater	$ 73,062	$ 69,359
Industrial and Miscellaneous [Member] | Fixed Maturity [Member]
Schedule of Available-for-sale Securities [Line Items]
Number of Securities, Less Than Twelve Months | Security	370	284
Gross Unrealized Losses, Less Than Twelve Months	$ 2,917	$ 376
Fair Value, Less Than Twelve Months	$ 125,982	$ 87,898
Number of Securities, Twelve Months or Greater | Security	80	38
Gross Unrealized Losses, Twelve Months or Greater	$ 643	$ 256
Fair Value, Twelve Months or Greater	$ 15,023	$ 11,788
Redeemable Preferred Stocks [Member] | Fixed Maturity [Member]
Schedule of Available-for-sale Securities [Line Items]
Number of Securities, Less Than Twelve Months | Security	52	41
Gross Unrealized Losses, Less Than Twelve Months	$ 507	$ 66
Fair Value, Less Than Twelve Months	$ 2,935	$ 3,987
Number of Securities, Twelve Months or Greater | Security	35	17
Gross Unrealized Losses, Twelve Months or Greater	$ 147	$ 5
Fair Value, Twelve Months or Greater	$ 1,389	$ 61
Nonredeemable Preferred Stocks [Member] | Equity Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Number of Securities, Less Than Twelve Months | Security	188	127
Gross Unrealized Losses, Less Than Twelve Months	$ 127	$ 188
Fair Value, Less Than Twelve Months	$ 10,934	$ 10,047
Number of Securities, Twelve Months or Greater | Security	11	6
Gross Unrealized Losses, Twelve Months or Greater	$ 62	$ 7
Fair Value, Twelve Months or Greater	$ 801	$ 159
Common Shares [Member] | Equity Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Number of Securities, Less Than Twelve Months | Security	15	11
Gross Unrealized Losses, Less Than Twelve Months	$ 187	$ 46
Fair Value, Less Than Twelve Months	$ 817	$ 677
Number of Securities, Twelve Months or Greater | Security	15	12
Gross Unrealized Losses, Twelve Months or Greater	$ 410	$ 223
Fair Value, Twelve Months or Greater	$ 1,105	$ 1,095

Fair Value of Financial Instr_3

Fair Value of Financial Instruments - Schedule of Fair Value of Financial Instruments (Detail) - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Available for sale debt securities	$ 515,541	$ 549,796
Available for sale equity securities	15,709	17,217
Available for sale securities	531,250	567,013
Nonredeemable Preferred Stocks [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Available for sale equity securities	13,171	14,324
Equity Investment [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Available for sale equity securities	2,538	2,893
Level 1 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Available for sale debt securities	5,017	359
Available for sale equity securities	15,709	17,217
Available for sale securities	20,726	17,576
Level 1 [Member] | Nonredeemable Preferred Stocks [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Available for sale equity securities	13,171	14,324
Level 1 [Member] | Equity Investment [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Available for sale equity securities	2,538	2,893
Level 2 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Available for sale debt securities	510,524	549,437
Available for sale securities	510,524	549,437
Fixed Maturity [Member] | U.S. government and agency securities [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Available for sale debt securities	45,885	38,880
Available for sale securities	45,885	38,880
Fixed Maturity [Member] | States, Municipalities and Political Subdivisions [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Available for sale debt securities	60,145	76,411
Available for sale securities	60,145	76,411
Fixed Maturity [Member] | Special Revenue [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Available for sale debt securities	255,493	267,677
Available for sale securities	255,493	267,677
Fixed Maturity [Member] | Industrial and Miscellaneous [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Available for sale debt securities	149,351	162,128
Available for sale securities	149,351	162,128
Fixed Maturity [Member] | Redeemable Preferred Stocks [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Available for sale debt securities	4,667	4,700
Available for sale securities	4,667	4,700
Fixed Maturity [Member] | Level 1 [Member] | U.S. government and agency securities [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Available for sale debt securities	350	359
Fixed Maturity [Member] | Level 1 [Member] | Redeemable Preferred Stocks [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Available for sale debt securities	4,667
Fixed Maturity [Member] | Level 2 [Member] | U.S. government and agency securities [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Available for sale debt securities	45,535	38,521
Fixed Maturity [Member] | Level 2 [Member] | States, Municipalities and Political Subdivisions [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Available for sale debt securities	60,145	76,411
Fixed Maturity [Member] | Level 2 [Member] | Special Revenue [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Available for sale debt securities	255,493	267,677
Fixed Maturity [Member] | Level 2 [Member] | Industrial and Miscellaneous [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Available for sale debt securities	$ 149,351	162,128
Fixed Maturity [Member] | Level 2 [Member] | Redeemable Preferred Stocks [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Available for sale debt securities		$ 4,700

Other Comprehensive Income (L_3

Other Comprehensive Income (Loss) - Summary of Other Comprehensive Income (Loss) and Tax Impact of Each Component of Other Comprehensive Income (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Other comprehensive (loss) income
Change in unrealized losses on investments, net, Pre-tax	$ (2,895)	$ 593	$ (9,918)	$ 8,473
Reclassification adjustment of realized losses (gains) included in net income, Pre-tax	(5)	(365)	307	(1,011)
Effect on other comprehensive (loss) income, Pre-tax	(2,900)	228	(9,611)	7,462
Change in unrealized losses on investments, net, Tax	1,666	(158)	3,185	(3,078)
Reclassification adjustment of realized losses (gains) included in net income, Tax	(1)	77	64	212
Effect on other comprehensive (loss) income, Tax	1,665	(81)	3,249	(2,866)
Change in unrealized losses on investments, net, After-tax	(1,229)	435	(6,733)	5,395
Reclassification adjustment of realized losses (gains) included in net income, After-tax	(6)	(288)	371	(799)
Effect on other comprehensive (loss) income, After-tax	$ (1,235)	$ 147	$ (6,362)	$ 4,596

Property and Equipment, Net - S

Property and Equipment, Net - Schedule of Property and Equipment (Detail) - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017
Property, Plant and Equipment [Line Items]
Total, at cost	$ 25,482	$ 24,057
Less: accumulated depreciation and amortization	7,002	5,309
Property and equipment, net	18,480	18,748
Land [Member]
Property, Plant and Equipment [Line Items]
Total, at cost	2,582	2,582
Building [Member]
Property, Plant and Equipment [Line Items]
Total, at cost	12,102	12,148
Computer Hardware and Software [Member]
Property, Plant and Equipment [Line Items]
Total, at cost	4,519	4,093
Office Furniture and Equipment [Member]
Property, Plant and Equipment [Line Items]
Total, at cost	1,058	759
Tenant and Leasehold Improvements [Member]
Property, Plant and Equipment [Line Items]
Total, at cost	4,341	3,660
Vehicle Fleet [Member]
Property, Plant and Equipment [Line Items]
Total, at cost	$ 880	$ 815

Property and Equipment, Net - A

Property and Equipment, Net - Additional Information (Detail)	3 Months Ended		9 Months Ended
	Sep. 30, 2018USD ($)Building	Sep. 30, 2017USD ($)	Sep. 30, 2018USD ($)aft²Building	Sep. 30, 2017USD ($)
Property Plant And Equipment Useful Life And Values [Abstract]
Depreciation and amortization expense | $	$ 1,000,000	$ 394,000	$ 1,700,000	$ 1,200,000
Number of acres of land purchased | a			15
Number of buildings | Building	5		5
Gross area of acquired property | ft²			229,000

Goodwill and Other Intangible_3

Goodwill and Other Intangible Assets - Additional Information (Details) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017	Dec. 31, 2017
Finite Lived Intangible Assets [Line Items]
Goodwill	$ 152,459,000		$ 152,459,000		$ 152,459,000
Intangibles, net	81,911,000		81,911,000		$ 101,626,000
Indefinite lived intangible, insurance licenses	1,300,000		1,300,000
Amortization of intangible assets	$ 6,400,000	$ 55,000,000	19,700,000	$ 3,600,000
Impairment of amortizing intangible assets			0	0
Impairment of non-amortizing intangible assets			$ 0	$ 0
NBIC [Member]
Finite Lived Intangible Assets [Line Items]
Estimated value of business acquired			1 year
Minimum [Member]
Finite Lived Intangible Assets [Line Items]
Useful life of intangible asset			2 years 6 months
Maximum [Member]
Finite Lived Intangible Assets [Line Items]
Useful life of intangible asset			15 years

Goodwill and Other Intangible_4

Goodwill and Other Intangible Assets - Schedule of Goodwill (Details) $ in Thousands	Sep. 30, 2018USD ($)
Goodwill And Intangible Assets Disclosure [Abstract]
Beginning balance	$ 152,459
Ending balance	$ 152,459

Goodwill and Other Intangible_5

Goodwill and Other Intangible Assets - Schedule of Estimated Amortization of Intangible Assets (Details) $ in Thousands	Sep. 30, 2018USD ($)	[1]
Goodwill And Intangible Assets Disclosure [Abstract]
2018 remaining	$ 5,060
2,019	8,208
2,020	6,365
2,021	6,351
2,022	6,351
2,023	6,351
Thereafter	41,910
Total	$ 80,596
[1]	Excludes insurance licenses valued at $1.3 million and classified as an indefinite lived intangible which is subject to annual impairment testing and not amortized

Goodwill and Other Intangible_6

Goodwill and Other Intangible Assets - Schedule of Estimated Amortization of Intangible Assets (Parenthetical) (Details) $ in Millions	Sep. 30, 2018USD ($)
Goodwill And Intangible Assets Disclosure [Abstract]
Indefinite lived intangible, insurance licenses	$ 1.3

Earnings Per Share - Schedule o

Earnings Per Share - Schedule of Computation of Basic and Diluted Earnings (Loss) Per Share (EPS) (Detail) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Basic earnings (loss) per share:
Net income (loss) attributable to common stockholders (000's)	$ 5,989	$ (8,696)	$ 23,227	$ 3,929
Weighted average shares outstanding	25,631,871	25,883,267	25,663,415	27,647,146
Basic earnings (loss) per share:	$ 0.23	$ (0.34)	$ 0.91	$ 0.14
Diluted earnings (loss) per share:
Net income (loss) attributable to common stockholders (000's)	$ 5,989	$ (8,696)	$ 23,227	$ 3,929
Weighted average shares outstanding	25,631,871	25,883,267	25,663,415	27,647,146
Weighted average dilutive shares	415,067		677,344
Total weighted average dilutive shares	26,046,938	25,883,267	26,340,759	27,647,146
Diluted earnings (loss) per share:	$ 0.23	$ (0.34)	$ 0.88	$ 0.14

Deferred Policy Acquisition C_3

Deferred Policy Acquisition Costs - Additional Information (Detail) - USD ($) $ in Millions	3 Months Ended	9 Months Ended
	Sep. 30, 2018	Sep. 30, 2018
General and Administrative Expenses [Member]
Deferred Policy Acquisition Costs [Line Items]
Deferred reinsurance ceding commissions, percentage		25.00%
Ceding commission income	$ 4.5	$ 13.8
Policy Acquisition Costs [Member]
Deferred Policy Acquisition Costs [Line Items]
Deferred reinsurance ceding commissions, percentage		75.00%
Ceding commission income	$ 13.7	$ 42.1

Deferred Policy Acquisition C_4

Deferred Policy Acquisition Costs - Schedule of Activity DPCC (Detail) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
	Sep. 30, 2018	Sep. 30, 2018
Insurance [Abstract]
Beginning balance of deferred ceding commission income	$ 42,666	$ 42,665
Ceding commission deferred	18,932	56,495
Less: ceding commission earned	(18,307)	(55,869)
Ending balance of deferred ceding commission income	$ 43,291	$ 43,291

Deferred Policy Acquisition C_5

Deferred Policy Acquisition Costs - Summary of Activity in Deferred Policy Acquisition Costs (DPAC) (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Insurance [Abstract]
Beginning Balance	$ 69,648	$ 41,792	$ 41,678	$ 42,779
Policy acquisition costs deferred	12,108	21,002	68,048	65,195
Amortization	(6,054)	(20,906)	(34,024)	(66,086)
Ending Balance	$ 75,702	$ 41,888	$ 75,702	$ 41,888

Income Taxes - Additional Infor

Income Taxes - Additional Information (Detail) - USD ($)	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017	Dec. 31, 2017
Income Tax Disclosure [Abstract]
Provision for income taxes	$ 3,002,000	$ (525,000)	$ 9,068,000	$ 7,390,000
Annual effective tax rate			28.10%	65.30%
Nondeductible effective tax rate					41.10%
U.S. federal corporate tax rate			21.00%		35.00%
Uncertain tax positions	$ 0		$ 0		$ 0

Income Taxes - Components of De

Income Taxes - Components of Deferred Tax Assets (Liabilities) (Detail) - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017
Deferred tax assets:
Unearned premiums	$ 10,780	$ 12,488
Unearned commission	10,417	11,987
Net operating loss		4,727
Tax-related discount on loss reserve	1,486	1,250
Unrealized loss	3,347
Stock-based compensation	1,126
Prepaid expenses	2,214	1,950
Other	1,429	331
Total deferred tax asset	30,799	32,733
Deferred tax liabilities:
Deferred acquisition costs	18,216	9,775
Prepaid expenses	342	27,568
Unrealized gains		30
Property and equipment	452
Note discount	2,498	3,818
Basis in purchased investments	179	335
Basis in purchased intangibles	19,518	24,250
Other	1,557	1,290
Total deferred tax liabilities	42,762	67,066
Net deferred tax liability	$ (11,963)	$ (34,333)

Reinsurance - Additional inform

Reinsurance - Additional information (Detail)

Feb. 29, 2016USD ($)

May 31, 2017USD ($)

Mar. 31, 2017USD ($)

Apr. 30, 2015USD ($)

Sep. 30, 2018USD ($)

Sep. 30, 2017USD ($)Reinsurer

Sep. 30, 2018USD ($)

May 31, 2018

Sep. 30, 2018USD ($)ReinsurerLayer

Sep. 30, 2017USD ($)

Dec. 31, 2017USD ($)

Jun. 30, 2018USD ($)

Jun. 30, 2017USD ($)

Dec. 31, 2016USD ($)

Reinsurance Premiums For Insurance Companies By Product Segment [Line Items]

Purchase of reinsurance from third party

$ 115,926,000

$ 57,855,000

$ 356,748,000

$ 182,189,000

Reinsurance payable

217,022,000

$ 217,022,000

217,022,000

$ 17,577,000

Prepaid reinsurance premiums

282,649,000

282,649,000

282,649,000

227,764,000

Net of prepaid reinsurance premium as attachment point

324,826,000

324,826,000

324,826,000

$ 357,357,000

Percentage of aggregate contract

25.00%

Unpaid losses and loss adjustment expenses

421,095,000

489,580,000

421,095,000

$ 421,095,000

489,580,000

$ 470,083,000

$ 488,610,000

$ 122,785,000

$ 140,137,000

Number of reinstatements available | Reinsurer

2

Aggregate participation, losses and loss adjustment expenses

(3,205,000)

3,599,000

$ 14,660,000

$ 1,473,000

Insurance Claims [Member]

Reinsurance Premiums For Insurance Companies By Product Segment [Line Items]

Unpaid losses and loss adjustment expenses

1,000,000

1,000,000

1,000,000

Property Per Risk Coverage [Member]

Reinsurance Premiums For Insurance Companies By Product Segment [Line Items]

Reinsurance payable

27,000,000

27,000,000

27,000,000

Coverage limit

$ 9,000,000

Hartford Steam Boiler [Member]

Reinsurance Premiums For Insurance Companies By Product Segment [Line Items]

Percentage comprising aggregate participation

100.00%

Heritage P&C [Member] | States Other Than Hawaii [Member]

Reinsurance Premiums For Insurance Companies By Product Segment [Line Items]

Percentage comprising aggregate participation

20.00%

Primary retention

$ 16,000,000

Primary retention

20,000,000

20,000,000

20,000,000

Primary retention

16,000,000

Agreement of coverage

3 years

3 years

Additional maturity period of collateral notes

2 years

2 years

Reinsurance agreement

3 years

3 years

Heritage P&C [Member] | States Other Than Hawaii [Member] | Notes Due March 2020 [Member]

Reinsurance Premiums For Insurance Companies By Product Segment [Line Items]

Collateralized by a reinsurance trust

$ 35,000,000

Heritage P&C [Member] | States Other Than Hawaii [Member] | Notes Due February 2019 [Member]

Reinsurance Premiums For Insurance Companies By Product Segment [Line Items]

Collateralized by a reinsurance trust

$ 250,000,000

Heritage P&C [Member] | States Other Than Hawaii [Member] | Class D Notes Due February 2019 [Member]

Reinsurance Premiums For Insurance Companies By Product Segment [Line Items]

Collateralized by a reinsurance trust

150,000,000

Heritage P&C [Member] | States Other Than Hawaii [Member] | Class E Notes Due February 2019 [Member]

Reinsurance Premiums For Insurance Companies By Product Segment [Line Items]

Collateralized by a reinsurance trust

$ 100,000,000

Heritage P&C [Member] | States Other Than Hawaii [Member] | Two Thousand Fifteen Class B And C Notes [Member]

Reinsurance Premiums For Insurance Companies By Product Segment [Line Items]

Agreement of coverage

3 years

Heritage P&C [Member] | States Other Than Hawaii [Member] | Class B Notes Due April 2017 [Member]

Reinsurance Premiums For Insurance Companies By Product Segment [Line Items]

Collateralized by a reinsurance trust

$ 97,500,000

Heritage P&C [Member] | States Other Than Hawaii [Member] | Class C Notes Due April 2017 [Member]

Reinsurance Premiums For Insurance Companies By Product Segment [Line Items]

Collateralized by a reinsurance trust

30,000,000

Heritage P&C [Member] | Top and Aggregate Layer [Member] | States Other Than Hawaii [Member]

Reinsurance Premiums For Insurance Companies By Product Segment [Line Items]

Primary retention

15,000,000

15,000,000

15,000,000

Aggregate participation, losses and loss adjustment expenses

5,000,000

Heritage P&C [Member] | Maximum [Member] | States Other Than Hawaii [Member]

Reinsurance Premiums For Insurance Companies By Product Segment [Line Items]

Aggregate participation, losses and loss adjustment expenses

36,000,000

Zephyr [Member] | Hawaii [Member]

Reinsurance Premiums For Insurance Companies By Product Segment [Line Items]

Primary retention

16,000,000

Primary retention

20,000,000

20,000,000

20,000,000

Primary retention

16,000,000

Zephyr [Member] | Top and Aggregate Layer [Member] | Hawaii [Member]

Reinsurance Premiums For Insurance Companies By Product Segment [Line Items]

Primary retention

15,000,000

15,000,000

15,000,000

Aggregate participation, losses and loss adjustment expenses

5,000,000

Heritage And Zephyr

Reinsurance Premiums For Insurance Companies By Product Segment [Line Items]

Primary retention

$ 2,600,000,000

Primary retention

20,000,000

20,000,000

20,000,000

Number of reinstatements available | Reinsurer

2

Heritage And Zephyr | Florida [Member]

Reinsurance Premiums For Insurance Companies By Product Segment [Line Items]

Primary retention

$ 1,750,000,000

Heritage And Zephyr | Hawaii [Member]

Reinsurance Premiums For Insurance Companies By Product Segment [Line Items]

Primary retention

$ 731,000,000

2018 - 2019 Reinsurance Program [Member]

Reinsurance Premiums For Insurance Companies By Product Segment [Line Items]

Reinsurance purchase limit

3,400,000,000

3,400,000,000

3,400,000,000

Purchase of reinsurance from third party

3,500,000,000

Reinsurance payable

252,000,000

$ 252,000,000

$ 252,000,000

FHCF [Member]

Reinsurance Premiums For Insurance Companies By Product Segment [Line Items]

Percentage comprising aggregate participation

45.00%

Gross Quota Share [Member] | NBIC [Member]

Reinsurance Premiums For Insurance Companies By Product Segment [Line Items]

Percentage of gross quota share

8.00%

18.75%

18.75%

Reinsurance recoveries on paid losses

$ 1,000,000,000

$ 1,000,000,000

$ 1,000,000,000

Net Quota Share [Member] | NBIC [Member]

Reinsurance Premiums For Insurance Companies By Product Segment [Line Items]

Net lines quota share occurrence limit

20,000,000

Percentage of ceded net premium and losses

60.00%

8.00%

Percentage of renewed ceded net premium and losses

49.50%

25% Aggregate Coverage [Member] | NBIC [Member]

Reinsurance Premiums For Insurance Companies By Product Segment [Line Items]

Percentage of aggregate contract

25.00%

Aggregate contract coverage limit

13,500,000

Primary retention

18,500,000

Franchise deductible amount

$ 1,000,000

Aggregate contract expiration date

May 31, 2018

42.5% Aggregate Coverage [Member] | NBIC [Member]

Reinsurance Premiums For Insurance Companies By Product Segment [Line Items]

Percentage of aggregate contract

42.50%

42.50%

42.50%

Aggregate contract coverage limit

$ 20,000,000

Primary retention

3,000,000

Franchise deductible amount

$ 1,500,000

Aggregate contract expiration date

Dec. 31, 2018

92.00% Aggregate Coverage [Member] | NBIC [Member]

Reinsurance Premiums For Insurance Companies By Product Segment [Line Items]

Percentage of aggregate contract

92.00%

92.00%

92.00%

Aggregate contract coverage limit

$ 20,000,000

Primary retention

$ 20,000,000

Aggregate contract expiration date

Dec. 31, 2018

Facultative Reinsurance [Member] | Minimum [Member]

Reinsurance Premiums For Insurance Companies By Product Segment [Line Items]

Facultative reinsurance purchase amount

$ 10,000,000

Facultative Reinsurance [Member] | Maximum [Member]

Reinsurance Premiums For Insurance Companies By Product Segment [Line Items]

Reinsurance payable

$ 10,000,000

$ 10,000,000

10,000,000

General Excess of Loss 2018-2019 Reinsurance Program [Member] | NBIC [Member]

Reinsurance Premiums For Insurance Companies By Product Segment [Line Items]

Primary retention

$ 300,000

Number of loss applied to reinsurance contract | Reinsurer

1

Number of layers in excess of rentention loss | Layer

2

General Excess of Loss 2018-2019 Reinsurance Program [Member] | NBIC [Member] | First Layer Coverage [Member]

Reinsurance Premiums For Insurance Companies By Product Segment [Line Items]

Primary retention

$ 450,000

Primary retention

300,000

General Excess of Loss 2018-2019 Reinsurance Program [Member] | NBIC [Member] | Second Layer Coverage [Member]

Reinsurance Premiums For Insurance Companies By Product Segment [Line Items]

Primary retention

2,750,000

Primary retention

750,000

General Excess of Loss 2018-2019 Reinsurance Program [Member] | NBIC [Member] | Casualty Second Layer [Member]

Reinsurance Premiums For Insurance Companies By Product Segment [Line Items]

Primary retention

1,250,000

Primary retention

$ 750,000

General Excess of Loss 2018-2019 Reinsurance Program [Member] | NBIC [Member] | First and Second Layer Coverage [Member]

Reinsurance Premiums For Insurance Companies By Product Segment [Line Items]

Percentage of gross quota share

92.00%

Additional coverage percentage of gross quota share

8.00%

Facultative 2018 - 2019 Reinsurance Program [Member] | NBIC [Member]

Reinsurance Premiums For Insurance Companies By Product Segment [Line Items]

Reinsurance loss limit

$ 3,750,000

Facultative 2018 - 2019 Reinsurance Program [Member] | NBIC [Member] | Minimum [Member]

Reinsurance Premiums For Insurance Companies By Product Segment [Line Items]

Reinsurance payable

3,500,000

3,500,000

3,500,000

FHCF Layer [Member] | Heritage P&C [Member] | Property Per Risk Coverage [Member] | States Other Than Hawaii [Member]

Reinsurance Premiums For Insurance Companies By Product Segment [Line Items]

Primary retention

$ 414,000,000

Percentage of maximum provisional limit

45.00%

Estimated provisional limit percentage calculation base amount

$ 1,300,000,000

FHCF Layer [Member] | Heritage And Zephyr | Property Per Risk Coverage [Member]

Reinsurance Premiums For Insurance Companies By Product Segment [Line Items]

Percentage comprising aggregate participation

45.00%

Shared Layers [Member] | Property Per Risk Coverage [Member]

Reinsurance Premiums For Insurance Companies By Product Segment [Line Items]

Purchase of reinsurance from third party

$ 372,000,000

Shared coverage amount available subject to seasonal aggregate

20,000,000

Seasonal aggregate amount

68,000,000

Shared Layers [Member] | Property Per Risk Coverage [Member] | Hawaii [Member]

Reinsurance Premiums For Insurance Companies By Product Segment [Line Items]

Purchase of reinsurance from third party

372,000,000

Shared coverage amount available subject to seasonal aggregate

20,000,000

Seasonal aggregate amount

68,000,000

Shared Layers [Member] | Heritage And Zephyr | Property Per Risk Coverage [Member]

Reinsurance Premiums For Insurance Companies By Product Segment [Line Items]

Purchased reinstatement premium

352,000,000

Shared Layers [Member] | Heritage And Zephyr | Property Per Risk Coverage [Member] | Hawaii [Member]

Reinsurance Premiums For Insurance Companies By Product Segment [Line Items]

Purchased reinstatement premium

352,000,000

Layers Above FHCF -Florida Program [Member] | Heritage P&C [Member] | States Other Than Hawaii [Member] | 2017-1 Notes [Member]

Reinsurance Premiums For Insurance Companies By Product Segment [Line Items]

Collateralized by a reinsurance trust

$ 125,000,000

Agreement of coverage

3 years

Additional maturity period of collateral notes

2 years

Reinsurance agreement

3 years

Layers Above FHCF -Florida Program [Member] | Heritage P&C [Member] | States Other Than Hawaii [Member] | Class A Notes Due April Two Thousand Seventeen [Member]

Reinsurance Premiums For Insurance Companies By Product Segment [Line Items]

Collateralized by a reinsurance trust

$ 150,000,000

Agreement of coverage

3 years

Additional maturity period of collateral notes

2 years

Reinsurance agreement

3 years

Top Hawaii Only Layer [Member] | Property Per Risk Coverage [Member]

Reinsurance Premiums For Insurance Companies By Product Segment [Line Items]

Purchase of reinsurance from third party

$ 26,000,000

2017 - 2018 Reinsurance Program [Member]

Reinsurance Premiums For Insurance Companies By Product Segment [Line Items]

Number of reinstatements available | Reinsurer

2

2017 - 2018 Reinsurance Program [Member] | Insurance Claims [Member]

Reinsurance Premiums For Insurance Companies By Product Segment [Line Items]

Unpaid losses and loss adjustment expenses

1,000,000

1,000,000

$ 1,000,000

2017 - 2018 Reinsurance Program [Member] | Property Per Risk Coverage [Member]

Reinsurance Premiums For Insurance Companies By Product Segment [Line Items]

Reinsurance payable

$ 27,000,000

$ 27,000,000

27,000,000

Coverage limit

$ 9,000,000

2017 - 2018 Reinsurance Program [Member] | NBIC [Member]

Reinsurance Premiums For Insurance Companies By Product Segment [Line Items]

Percentage of aggregate contract

25.00%

25.00%

25.00%

Aggregate contract coverage limit

$ 13,500,000

Primary retention

18,500,000

Franchise deductible amount

$ 1,000,000

Aggregate contract expiration date

May 31, 2018

2017 - 2018 Reinsurance Program [Member] | Citrus Re Ltd [Member]

Reinsurance Premiums For Insurance Companies By Product Segment [Line Items]

Percentage comprising aggregate participation

26.00%

Purchase of reinsurance from third party

$ 687,500,000

Coverage arrangements, period

multi-year

2017 - 2018 Reinsurance Program [Member] | Citrus Re Ltd [Member] | Class A and B and C Due in May 2018 [Member]

Reinsurance Premiums For Insurance Companies By Product Segment [Line Items]

Purchase of reinsurance from third party

$ 277,500,000

Notes maturity date

May 31, 2018

2017 - 2018 Reinsurance Program [Member] | Citrus Re Ltd [Member] | Class D and E Due in Two-year Period [Member]

Reinsurance Premiums For Insurance Companies By Product Segment [Line Items]

Purchase of reinsurance from third party

$ 250,000,000

Additional maturity period of collateral notes

2 years

2017 - 2018 Reinsurance Program [Member] | Citrus Re Ltd [Member] | Notes Due in Three-year Period [Member]

Reinsurance Premiums For Insurance Companies By Product Segment [Line Items]

Purchase of reinsurance from third party

$ 160,000,000

Notes maturity period

3 years

2017-2018 NBIC Program [Member] | Reinsurer Concentration Risk [Member] | Reinsurance Recoverable Including Reinsurance Premium Paid [Member]

Reinsurance Premiums For Insurance Companies By Product Segment [Line Items]

Concentration risk percentage

10.00%

2017-2018 NBIC Program [Member] | NBIC [Member]

Reinsurance Premiums For Insurance Companies By Product Segment [Line Items]

Primary retention

$ 1,000,000,000

General Excess of Loss [Member] | NBIC [Member]

Reinsurance Premiums For Insurance Companies By Product Segment [Line Items]

Primary retention

$ 300,000

Number of loss applied to reinsurance contract | Reinsurer

1

Number of layers in excess of rentention loss | Layer

2

General Excess of Loss [Member] | NBIC [Member] | First Layer Coverage [Member]

Reinsurance Premiums For Insurance Companies By Product Segment [Line Items]

Primary retention

$ 450,000

Primary retention

300,000

General Excess of Loss [Member] | NBIC [Member] | Second Layer Coverage [Member]

Reinsurance Premiums For Insurance Companies By Product Segment [Line Items]

Primary retention

2,750,000

Primary retention

750,000

General Excess of Loss [Member] | NBIC [Member] | Casualty Second Layer [Member]

Reinsurance Premiums For Insurance Companies By Product Segment [Line Items]

Primary retention

1,250,000

Primary retention

$ 750,000

General Excess of Loss [Member] | NBIC [Member] | First and Second Layer Coverage [Member]

Reinsurance Premiums For Insurance Companies By Product Segment [Line Items]

Percentage of gross quota share

81.25%

Additional coverage percentage of gross quota share

18.75%

Facultative 2017 - 2018 Reinsurance Program [Member] | NBIC [Member]

Reinsurance Premiums For Insurance Companies By Product Segment [Line Items]

Reinsurance loss limit

$ 2,500,000

Facultative 2017 - 2018 Reinsurance Program [Member] | NBIC [Member] | Minimum [Member]

Reinsurance Premiums For Insurance Companies By Product Segment [Line Items]

Reinsurance payable

$ 3,500,000

$ 3,500,000

$ 3,500,000

Umbrella Facultative Reinsurance | NBIC [Member]

Reinsurance Premiums For Insurance Companies By Product Segment [Line Items]

Percentage of quota share

90.00%

Additional percentage of quota share

100.00%

Umbrella Facultative Reinsurance | NBIC [Member] | Maximum [Member]

Reinsurance Premiums For Insurance Companies By Product Segment [Line Items]

Limits of liability

1,000,000

1,000,000

$ 1,000,000

Additional limits of liability

4,000,000

4,000,000

4,000,000

Catastrophe [Member]

Reinsurance Premiums For Insurance Companies By Product Segment [Line Items]

Reinsurance purchase limit

632,000,000

632,000,000

632,000,000

Catastrophe [Member] | Citrus [Member] | Property Per Risk Coverage [Member] | States Other Than Hawaii [Member] | Two Thousand Fifteen C And C Series Bond And Two Thousand Sixteen D and E Bond And Two Thousand Seventeen Two Bond [Member]

Reinsurance Premiums For Insurance Companies By Product Segment [Line Items]

Collateralized by a reinsurance trust

412,500,000

412,500,000

412,500,000

Additional coverage of second catastrophe reinsurance agreement

$ 5,000,000

Catastrophe [Member] | 2018 - 2019 Reinsurance Program [Member]

Reinsurance Premiums For Insurance Companies By Product Segment [Line Items]

Reinsurance premium, amortization period

12 months

Catastrophe [Member] | Aggregate Coverage | Property Per Risk Coverage [Member]

Reinsurance Premiums For Insurance Companies By Product Segment [Line Items]

Purchased reinstatement premium

$ 700,000,000

Prepaid reinsurance premiums

632,000,000

632,000,000

632,000,000

Catastrophe [Member] | Aggregate Coverage | Heritage P&C [Member] | Property Per Risk Coverage [Member] | States Other Than Hawaii [Member]

Reinsurance Premiums For Insurance Companies By Product Segment [Line Items]

Purchased reinstatement premium

984,000,000

Prepaid reinsurance premiums

606,000,000

606,000,000

606,000,000

Net of prepaid reinsurance premium as attachment point

40,000,000

40,000,000

40,000,000

Catastrophe [Member] | Aggregate Coverage | Heritage And Zephyr

Reinsurance Premiums For Insurance Companies By Product Segment [Line Items]

Purchased reinstatement premium

1,100,000,000

Prepaid reinsurance premiums

669,000,000

669,000,000

669,000,000

Net of prepaid reinsurance premium as attachment point

40,000,000

40,000,000

40,000,000

Catastrophe [Member] | Multi-Zonal Layers [Member] | Heritage P&C [Member] | Property Per Risk Coverage [Member] | States Other Than Hawaii [Member]

Reinsurance Premiums For Insurance Companies By Product Segment [Line Items]

Coverage of first catastrophe reinsurance agreement

254,000,000

Catastrophe [Member] | Multi-Zonal Layers [Member] | Zephyr [Member] | Property Per Risk Coverage [Member]

Reinsurance Premiums For Insurance Companies By Product Segment [Line Items]

Prepaid reinsurance premiums

254,000,000

254,000,000

254,000,000

Coverage of first catastrophe reinsurance agreement

302,000,000

Catastrophe [Member] | Multi-Zonal Layers [Member] | Zephyr [Member] | Property Per Risk Coverage [Member] | Florida [Member]

Reinsurance Premiums For Insurance Companies By Product Segment [Line Items]

Purchased reinstatement premium

254,000,000

Catastrophe [Member] | Multi-Zonal Layers [Member] | Zephyr [Member] | Property Per Risk Coverage [Member] | Hawaii [Member]

Reinsurance Premiums For Insurance Companies By Product Segment [Line Items]

Purchased reinstatement premium

254,000,000

Catastrophe [Member] | A Top And Aggregate Multi Zonal Layer [Member] | Zephyr [Member] | Property Per Risk Coverage [Member] | Florida [Member]

Reinsurance Premiums For Insurance Companies By Product Segment [Line Items]

Purchased reinstatement premium

48,000,000

Catastrophe [Member] | A Top And Aggregate Multi Zonal Layer [Member] | Zephyr [Member] | Property Per Risk Coverage [Member] | Hawaii [Member]

Reinsurance Premiums For Insurance Companies By Product Segment [Line Items]

Purchased reinstatement premium

48,000,000

Catastrophe [Member] | 2017 - 2018 Reinsurance Program [Member]

Reinsurance Premiums For Insurance Companies By Product Segment [Line Items]

Purchase of reinsurance from third party

$ 2,600,000,000

Description of hurricane losses coverage and protection

Hurricane losses in states other than Hawaii were covered under the Heritage P&C program with the exception of the FHCF coverage and the series 2015, 2016 and 2017 catastrophe bonds which cover events solely occurring in Florida. Management deemed this reinsurance protection to be sufficient given the level of catastrophe exposure in 2017 for Alabama, Georgia, North Carolina and South Carolina.

Catastrophe [Member] | 2017 - 2018 Reinsurance Program [Member] | Property Per Risk Coverage [Member] | Florida [Member]

Reinsurance Premiums For Insurance Companies By Product Segment [Line Items]

Unpaid losses and loss adjustment expenses

1,750,000,000

1,750,000,000

$ 1,750,000,000

Catastrophe [Member] | 2017 - 2018 Reinsurance Program [Member] | Property Per Risk Coverage [Member] | Hawaii [Member]

Reinsurance Premiums For Insurance Companies By Product Segment [Line Items]

Unpaid losses and loss adjustment expenses

731,000,000

731,000,000

731,000,000

Catastrophe [Member] | 2017-2018 NBIC Program [Member] | NBIC [Member]

Reinsurance Premiums For Insurance Companies By Product Segment [Line Items]

Primary retention

1,300,000

1,300,000

$ 1,300,000

Quota Share [Member] | 2018 - 2019 Reinsurance Program [Member]

Reinsurance Premiums For Insurance Companies By Product Segment [Line Items]

Reinsurance premium, amortization period

12 months

First Catastrophic Event [Member] | Heritage P&C [Member] | States Other Than Hawaii [Member]

Reinsurance Premiums For Insurance Companies By Product Segment [Line Items]

Percentage comprising aggregate participation

20.00%

Primary retention

878,000,000

878,000,000

$ 878,000,000

First Catastrophic Event [Member] | Heritage P&C [Member] | Maximum [Member] | States Other Than Hawaii [Member]

Reinsurance Premiums For Insurance Companies By Product Segment [Line Items]

Aggregate participation, losses and loss adjustment expenses

$ 727,000

First Catastrophic Event [Member] | Zephyr [Member] | Hawaii [Member]

Reinsurance Premiums For Insurance Companies By Product Segment [Line Items]

Percentage comprising aggregate participation

3.80%

Primary retention

386,000,000

386,000,000

$ 386,000,000

First Catastrophic Event [Member] | Zephyr [Member] | Maximum [Member] | Hawaii [Member]

Reinsurance Premiums For Insurance Companies By Product Segment [Line Items]

Aggregate participation, losses and loss adjustment expenses

12,000,000

First Catastrophic Event [Member] | 2018 - 2019 Reinsurance Program [Member] | NBIC [Member]

Reinsurance Premiums For Insurance Companies By Product Segment [Line Items]

Primary retention

1,000,000,000

Primary retention

12,800,000

12,800,000

12,800,000

First Catastrophic Event [Member] | 2018 - 2019 Reinsurance Program [Member] | Heritage P&C [Member]

Reinsurance Premiums For Insurance Companies By Product Segment [Line Items]

Primary retention

1,600,000,000

Primary retention

20,000,000

20,000,000

20,000,000

First Catastrophic Event [Member] | 2018 - 2019 Reinsurance Program [Member] | Zephyr [Member]

Reinsurance Premiums For Insurance Companies By Product Segment [Line Items]

Primary retention

801,000,000

Primary retention

20,000,000

20,000,000

20,000,000

First Catastrophic Event [Member] | 2018 - 2019 Reinsurance Program [Member] | Osprey

Reinsurance Premiums For Insurance Companies By Product Segment [Line Items]

Primary retention

4,000,000

4,000,000

$ 4,000,000

Second Catastrophic Event [Member] | NBIC [Member]

Reinsurance Premiums For Insurance Companies By Product Segment [Line Items]

Number reinsurance reinstatement provisions | Reinsurer

1

Percentage of reinsurance reinstatement provisions premium

100.00%

Second Catastrophic Event [Member] | Heritage P&C [Member] | States Other Than Hawaii [Member]

Reinsurance Premiums For Insurance Companies By Product Segment [Line Items]

Percentage comprising aggregate participation

11.50%

Primary retention

420,000,000

420,000,000

$ 420,000,000

Second Catastrophic Event [Member] | Zephyr [Member] | Hawaii [Member]

Reinsurance Premiums For Insurance Companies By Product Segment [Line Items]

Percentage comprising aggregate participation

117.70%

Primary retention

386,000,000

386,000,000

$ 386,000,000

Second Catastrophic Event [Member] | Zephyr [Member] | Maximum [Member] | Hawaii [Member]

Reinsurance Premiums For Insurance Companies By Product Segment [Line Items]

Aggregate participation, losses and loss adjustment expenses

56,000,000

Second Catastrophic Event [Member] | 2018 - 2019 Reinsurance Program [Member] | NBIC [Member]

Reinsurance Premiums For Insurance Companies By Product Segment [Line Items]

Primary retention

8,800,000

Second Catastrophic Event [Member] | 2018 - 2019 Reinsurance Program [Member] | Heritage P&C [Member]

Reinsurance Premiums For Insurance Companies By Product Segment [Line Items]

Primary retention

16,000,000

Second Catastrophic Event [Member] | 2018 - 2019 Reinsurance Program [Member] | Zephyr [Member]

Reinsurance Premiums For Insurance Companies By Product Segment [Line Items]

Primary retention

$ 16,000,000

Second Catastrophic Event [Member] | Gross Quota Share [Member] | NBIC [Member]

Reinsurance Premiums For Insurance Companies By Product Segment [Line Items]

Percentage of gross quota share

81.25%

Percentage of remaining gross quota share

18.75%

Second Catastrophic Event [Member] | Net Quota Share [Member] | NBIC [Member]

Reinsurance Premiums For Insurance Companies By Product Segment [Line Items]

Reduction in reinsurance reinstatement net retention amount

$ 20,000,000

Aggregate Excess For All Catastrophe Losses Excluding Named Tropical Storms

Reinsurance Premiums For Insurance Companies By Product Segment [Line Items]

Reinsurance payable

$ 20,000,000

Aggregate Excess For All Catastrophe Losses Excluding Named Tropical Storms | Minimum [Member]

Reinsurance Premiums For Insurance Companies By Product Segment [Line Items]

Limit of aggregate losses under aggregate contract

21,500,000

Aggregate Excess For All Catastrophe Losses Excluding Named Tropical Storms | 2017 - 2018 Reinsurance Program [Member] | NBIC [Member]

Reinsurance Premiums For Insurance Companies By Product Segment [Line Items]

Reinsurance payable

20,000,000

20,000,000

20,000,000

Aggregate Excess For All Catastrophe Losses Excluding Named Tropical Storms | 2017 - 2018 Reinsurance Program [Member] | NBIC [Member] | Minimum [Member]

Reinsurance Premiums For Insurance Companies By Product Segment [Line Items]

Limit of aggregate losses under aggregate contract

21,500,000

Named Tropical Storm Losses

Reinsurance Premiums For Insurance Companies By Product Segment [Line Items]

Reinsurance payable

12,000,000

Named Tropical Storm Losses | Minimum [Member]

Reinsurance Premiums For Insurance Companies By Product Segment [Line Items]

Limit of aggregate losses under aggregate contract

$ 8,000,000

Named Tropical Storm Losses | 2017 - 2018 Reinsurance Program [Member] | NBIC [Member]

Reinsurance Premiums For Insurance Companies By Product Segment [Line Items]

Reinsurance payable

$ 12,000,000

$ 12,000,000

12,000,000

Named Tropical Storm Losses | 2017 - 2018 Reinsurance Program [Member] | NBIC [Member] | Minimum [Member]

Reinsurance Premiums For Insurance Companies By Product Segment [Line Items]

Reinsurance loss limit

$ 8,000,000

Reserve for Unpaid Losses - Sum

Reserve for Unpaid Losses - Summary of Reserve for Unpaid Losses (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Insurance [Abstract]
Balance, beginning of period	$ 488,610	$ 122,785	$ 470,083	$ 140,137
Less: reinsurance recoverable on unpaid losses	315,308	2,499	315,353	589
Net balance, beginning of period	173,302	120,286	154,730	139,548
Incurred related to:
Current year	61,900	60,436	163,115	155,255
Prior years	(3,205)	3,599	14,660	1,473
Total incurred	58,695	64,035	177,775	156,728
Paid related to:
Current year	19,544	62,842	41,361	102,079
Prior years	17,585	16,198	96,276	88,917
Total paid	37,129	79,040	137,637	190,996
Unpaid claim liabilities from Sawgrass		15,991		15,991
Net balance, end of period	194,868	121,270	194,868	121,270
Plus: reinsurance recoverable on unpaid losses	226,227	368,310	226,227	368,310
Balance, end of period	$ 421,095	$ 489,580	$ 421,095	$ 489,580

Reserve for Unpaid Losses - Add

Reserve for Unpaid Losses - Additional Information (Detail) - USD ($) $ in Thousands	3 Months Ended			9 Months Ended
	Sep. 30, 2018	Mar. 31, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017	Jun. 30, 2018	Dec. 31, 2017	Jun. 30, 2017	Dec. 31, 2016
Liability For Claims And Claims Adjustment Expense [Line Items]
Unpaid losses and loss adjustment expenses	$ 194,868		$ 121,270	$ 194,868	$ 121,270	$ 173,302	$ 154,730	$ 120,286	$ 139,548
Unpaid losses and loss adjustment expenses attributable to IBNR net of reinsurance recoverable	$ 134,100			$ 134,100
Net reserves for unpaid losses and loss adjustment expenses, percentage	68.80%			68.80%
Aggregate participation, losses and loss adjustment expenses	$ (3,205)		$ 3,599	$ 14,660	$ 1,473
Hurricane Florence [Member]
Liability For Claims And Claims Adjustment Expense [Line Items]
Losses and loss adjusted expenses incurred from catastrophes	20,000
Losses and loss adjusted expenses incurred from catastrophes, net of reinsurance	$ 16,000
Winter Storms [Member]
Liability For Claims And Claims Adjustment Expense [Line Items]
Losses and loss adjusted expenses incurred from catastrophes		$ 54,300
Losses and loss adjusted expenses incurred from catastrophes, net of reinsurance		$ 8,900

Long-Term Debt - Additional Inf

Long-Term Debt - Additional Information (Detail) - USD ($)	9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Oct. 31, 2018	Aug. 07, 2018	Apr. 30, 2018	Dec. 31, 2017	Nov. 30, 2017	Oct. 31, 2017	Aug. 31, 2017	Dec. 31, 2016
Debt Instrument [Line Items]
Long-term debt	$ 196,986,000					$ 207,782,000
Net of issuance costs	$ 178,330,000					$ 184,405,000
Subsequent Event [Member] | Convertible Note [Member]
Debt Instrument [Line Items]
Repurchase of convertible notes			$ 2,100,000
Repurchase of convertible notes, cost			2,500,000
Heritage P&C [Member] | Convertible Note [Member]
Debt Instrument [Line Items]
Repurchase of convertible notes							$ 21,100,000
Repurchase of convertible notes, cost							$ 25,200,000
'Heritage Insurance Holdings, Inc. [Member] | Convertible Note [Member]
Debt Instrument [Line Items]
Repurchase of convertible notes					$ 10,600,000
Repurchase of convertible notes, cost					$ 13,400,000
Senior Secured Notes [Member]
Debt Instrument [Line Items]
Long-term debt										$ 79,500,000
Interest rate	8.75%
Frequency of periodic interest payments	quarterly
Principal payment commencement date	Dec. 15, 2018
Net of issuance costs	$ 74,000,000
Issuance costs	5,300,000
Interest paid	6,600,000	$ 7,000,000
Convertible Senior Notes [Member]
Debt Instrument [Line Items]
Interest rate		5.875%							5.875%
Net of issuance costs	90,500,000
Interest paid	$ 7,700,000	$ 0
Aggregate principal amount		$ 136,800,000							$ 136,800,000
Notes maturity date	Aug. 1, 2037
Interest payments term	Interest accrues from August 16, 2017 and is payable semi-annually in arrears, on February 1 and August 1 of each year, beginning in 2018.
Net of issuance and debt discount costs	$ 11,000,000
Repurchase of convertible notes, retired				$ 10,600,000
Convertible Senior Notes [Member] | Subsequent Event [Member]
Debt Instrument [Line Items]
Repurchase of convertible notes			3,100,000
Repurchase of convertible notes, cost			$ 3,600,000
Collateral Financial Arrangement [Member] | Skye Lane Properties LLC [Member]
Debt Instrument [Line Items]
Interest rate								4.95%
Frequency of periodic interest payments	monthly
Aggregate principal amount								$ 12,700,000
Payment of principal and interest	$ 670,000

Long-Term Debt - Schedule of Co

Long-Term Debt - Schedule of Company's Long-Term Debt (Detail) - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017
Debt Instrument [Line Items]
Principal amount	$ 196,986	$ 207,782
Total long-term debt	178,330	184,405
Convertible Debt [Member]
Debt Instrument [Line Items]
Principal amount	105,024	115,624
Debt discount and issuance cost on convertible debt	13,610	17,605
Senior Note Payable [Member]
Debt Instrument [Line Items]
Principal amount	79,500	79,500
Debt issuance cost on senior note payable	5,046	5,772
Mortgage Loan [Member]
Debt Instrument [Line Items]
Principal amount	$ 12,462	$ 12,658

Accounts Payable and Other Li_3

Accounts Payable and Other Liabilities - Schedule of Other Liabilities (Detail) - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017
Other Liabilities Disclosure [Abstract]
Deferred ceding commission	$ 43,291	$ 51,109
Outstanding claim checks	2,309	79,666
Accounts payable and other payables	13,755	17,948
Accrued interest and issuance costs	757	3,117
Accrued dividends	1,594
Other liabilities	3,096	5,088
Commission payables	12,958	12,609
Total other liabilities	$ 77,760	$ 169,537

Statutory Accounting and Regu_2

Statutory Accounting and Regulations - Additional Information (Detail) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017	Dec. 31, 2017
Statutory Accounting Practices [Line Items]
Net income (loss)	$ 5,989,000	$ (8,696,000)	$ 23,227,000	$ 3,929,000
Heritage P&C [Member]
Statutory Accounting Practices [Line Items]
Statutory accounting practices, capital and surplus requirements of insurance subsidiary			Greater of $15 million or 10% of their respective liabilities.
Minimum required amount of capital and surplus maintained by the insurance subsidiary	15,000,000		$ 15,000,000
Statutory capital and surplus requirements, percentage			10.00%
Statutory capital and surplus	367,800,000		$ 367,800,000		$ 376,200,000
Net income (loss)			(71,400,000)	$ (12,900,000)
Zephyr [Member]
Statutory Accounting Practices [Line Items]
Deposits held	750,000		750,000
NBIC [Member]
Statutory Accounting Practices [Line Items]
Statutory capital and surplus	$ 3,000,000		$ 3,000,000

Related Party Transactions - Ad

Related Party Transactions - Additional Information (Detail) - USD ($)	1 Months Ended	9 Months Ended
	Jan. 31, 2017	Sep. 30, 2018	Sep. 30, 2017
Mrs. Shannon Lucas [Member]
Related Party Transaction [Line Items]
Consulting fees hourly rate	$ 400
Immediate Family Member of Management or Principal Owner [Member]
Related Party Transaction [Line Items]
Consulting fees		$ 575,200	$ 371,000
Heritage P&C and NBIC [Member] | Director [Member]
Related Party Transaction [Line Items]
Director annual compensation	$ 150,000

Employee Benefit Plans - Additi

Employee Benefit Plans - Additional Information (Detail) - USD ($)	9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017
NBIC [Member]
Defined Contribution Plan Disclosure [Line Items]
Defined Contribution Plan, Plan Name	401(k)
Employer contribution, vesting percentage	20.00%
Employer contribution, vesting period	5 years
Maximum [Member] | NBIC [Member]
Defined Contribution Plan Disclosure [Line Items]
Percentage of contribution on employee salary	4.00%
Heritage P&C, CAN, HMGA and Zephyr [Member]
Defined Contribution Plan Disclosure [Line Items]
Contribution for participating employees	$ 515,000	$ 478,000
Defined Contribution Plan, Plan Name	401(k)
Heritage P&C, CAN, HMGA and Zephyr [Member] | Florida [Member]
Defined Contribution Plan Disclosure [Line Items]
Medical premium cost	$ 3,000,000	$ 2,200,000
Additional liability for unpaid claims	227,000
Stop loss coverage per employee	60,000
Defined contribution plan, aggregate limit for losses	$ 1,500,000
Defined contribution plan, aggregate stop loss commences threshold percentage	125.00%
Heritage P&C, CAN, HMGA and Zephyr [Member] | Maximum [Member]
Defined Contribution Plan Disclosure [Line Items]
Percentage of contribution on employee salary	4.00%
Heritage P&C, CAN, HMGA and Zephyr [Member] | Maximum [Member] | Florida [Member]
Defined Contribution Plan Disclosure [Line Items]
Defined contribution plan, aggregate limit for losses in provided amount	$ 1,000,000
Heritage P&C, CAN, HMGA and Zephyr [Member] | First 3% of Employees [Member]
Defined Contribution Plan Disclosure [Line Items]
Percentage of contribution on employee salary	100.00%
Heritage P&C, CAN, HMGA and Zephyr [Member] | Next 2% of the Employees [Member]
Defined Contribution Plan Disclosure [Line Items]
Percentage of contribution on employee salary	50.00%
NBIC [Member]
Defined Contribution Plan Disclosure [Line Items]
Contribution for participating employees	$ 331,000

Equity - Additional Information

Equity - Additional Information (Detail) - USD ($)	Aug. 01, 2018	May 04, 2016	Sep. 30, 2018	Mar. 31, 2018	Jun. 30, 2018	Sep. 30, 2018	Sep. 30, 2017	Dec. 31, 2017
Class Of Stock [Line Items]
Common stock, shares authorized			50,000,000			50,000,000		50,000,000
Preferred stock, shares authorized			5,000,000			5,000,000
Common stock, shares outstanding			25,769,804			25,769,804		25,885,004
Treasury stock, shares			7,214,797			7,214,797		7,099,597
Additional paid-in capital			$ 295,500,000			$ 295,500,000		$ 294,836,000
Common stock voting rights						one vote
Stock Repurchase Program, Authorized Amount	$ 50,000,000	$ 70,000,000
Treasury shares repurchased, shares				115,200
Treasury shares repurchased, value				$ 2,000,000		$ 2,000,000	$ 61,624,000	$ 47,000,000
Stock repurchase plan expiration date	Dec. 31, 2020	Jun. 30, 2018
Restricted Stock [Member]
Class Of Stock [Line Items]
Unvested shares of restricted common stock issued			830,801		800,000	830,801		675,000
Unvested restricted stock grants			30,801	125,000	125,000			675,000

Equity - Summary of Cash Divide

Equity - Summary of Cash Dividends (Detail) - USD ($)	3 Months Ended
	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018
Equity [Abstract]
Cash dividend per common share	$ 0.06	$ 0.06	$ 0.06
Total cash dividends paid	$ 1,594,188	$ 1,594,188	$ 1,601,100
Record date	Sep. 15, 2018	Jun. 15, 2018	Mar. 15, 2018
Payment date	Oct. 3, 2018	Jul. 6, 2018	Apr. 3, 2018

Stock-Based Compensation - Addi

Stock-Based Compensation - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended		6 Months Ended	9 Months Ended		12 Months Ended
	Sep. 30, 2018	Mar. 31, 2018	Jun. 30, 2018	Sep. 30, 2018	Sep. 30, 2017	Dec. 31, 2017	May 22, 2014
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Maximum tenure of stock option from the date of grant				10 years
Exercisable period of vested awards				30 days
Minimum [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Stock options, Vesting period				1 year
Maximum [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Stock options, Vesting period				5 years
Restricted Stock [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Restricted stock awards granted	30,801	125,000	125,000			675,000
Restricted stock fair value	$ 15.08	$ 16.35	$ 16.35
Stock options, Vesting period	3 years	5 years
Stock-based compensation expense				$ 3.9	$ 3.6
Unrecognized stock compensation expense	$ 12.3			$ 12.3
Unrecognized stock compensation expense, weighted average period				2 years 6 months
Restricted Stock [Member] | Minimum [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Stock options, Vesting period				3 years
Restricted Stock [Member] | Maximum [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Stock options, Vesting period				5 years
Omnibus Incentive Plan [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Common stock reserved for issuance							2,981,737
Shares available for grant	1,200,898			1,200,898		1,231,699

Stock-Based Compensation - Sche

Stock-Based Compensation - Schedule of Restricted Stock Activity (Detail) - Restricted Stock [Member] - $ / shares	3 Months Ended		6 Months Ended	12 Months Ended
	Sep. 30, 2018	Mar. 31, 2018	Jun. 30, 2018	Dec. 31, 2017
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Beginning balance, Number of shares	800,000	675,000	675,000
Granted, Number of shares	30,801	125,000	125,000	675,000
Ending balance, Number of shares	830,801		800,000	675,000
Beginning balance, Weighted-Average Grant-Date Fair Value per Share	$ 20.61	$ 21.40	$ 21.40
Granted, Weighted-Average Grant-Date Fair Value per Share	15.08	$ 16.35	16.35
Ending balance, Weighted-Average Grant-Date Fair Value per Share	$ 20.41		$ 20.61	$ 21.40

Subsequent Events - Additional

Subsequent Events - Additional Information (Detail) - USD ($)	Oct. 31, 2018	Oct. 07, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018
Subsequent Event [Line Items]
Cash dividend, payable date			Oct. 3, 2018	Jul. 6, 2018	Apr. 3, 2018
Dividend payable, record date			Sep. 15, 2018	Jun. 15, 2018	Mar. 15, 2018
Subsequent Event [Member]
Subsequent Event [Line Items]
Cash dividend, declared date	Oct. 31, 2018
Cash dividend per common share	$ 0.06
Cash dividend, payable date	Jan. 4, 2019
Dividend payable, record date	Dec. 15, 2018
Subsequent Event [Member] | Convertible Note [Member]
Subsequent Event [Line Items]
Repurchase of convertible notes	$ 2,100,000
Repurchase of convertible notes, cost	$ 2,500,000
Subsequent Event [Member] | Hurricane Michael [Member]
Subsequent Event [Line Items]
Estimated damages cost from hurricane		$ 12,000,000,000
Projected gross losses from hurricane, retain amount		$ 10,000,000
Percentage of retain value of next covered hurricane losses		20.00%
Next covered hurricane losses		$ 5,000,000
Subsequent Event [Member] | Hurricane Michael [Member] | Minimum [Member]
Subsequent Event [Line Items]
Projected gross losses from hurricane		$ 25,000,000

Out-Of-Period Adjustment - Addi

Out-Of-Period Adjustment - Additional Information (Detail) - USD ($) $ in Thousands	Sep. 30, 2018	Jun. 30, 2018	Dec. 31, 2017
Out-Of-Period Adjustment [Line Items]
Increase in prepaid reinsurance premiums	$ 282,649		$ 227,764
Increase in reinsurance payable	217,022		17,577
Net amount of amortized premium to reinsurance payable and prepaid reinsurance premiums	324,826		$ 357,357
Out-Of-Period Adjustment [Member]
Out-Of-Period Adjustment [Line Items]
Increase in prepaid reinsurance premiums		$ 51,000
Increase in reinsurance payable		$ 51,000
Net amount of amortized premium to reinsurance payable and prepaid reinsurance premiums	$ 39,300