Summary of Significant Accounting Policies (Policies)	6 Months Ended
Jun. 30, 2024
Accounting Policies [Abstract]
Basis of Presentation	Basis of Presentation The accompanying unaudited consolidated financial statements of HCI Group, Inc. and its majority-owned and controlled subsidiaries (collectively, the “Company”) have been prepared in accordance with accounting principles generally accepted in the United States of America (“U.S. GAAP”) for interim financial information, and the Securities and Exchange Commission (“SEC”) rules for interim financial reporting. Certain information and footnote disclosures normally included in consolidated financial statements prepared in accordance with U.S. GAAP have been omitted pursuant to such rules and regulations. However, in the opinion of management, the accompanying consolidated financial statements reflect all normal recurring adjustments necessary to present fairly the Company’s financial position as of June 30, 2024 and the results of operations and cash flows for the interim periods presented. The results of operations for the interim periods presented are not necessarily indicative of the results of operations to be expected for any subsequent interim period or for the fiscal year ending December 31, 2024. The accompanying unaudited consolidated financial statements and notes thereto should be read in conjunction with the audited consolidated financial statements for the year ended December 31, 2023 included in the Company’s Form 10-K, which was filed with the SEC on March 8, 2024. In preparing the interim unaudited consolidated financial statements, management was required to make certain judgments, assumptions, and estimates that affect the reported amounts of assets, liabilities, revenues, expenses and related disclosures at the financial reporting date and throughout the periods being reported upon. Certain of the estimates result from judgments that can be subjective and complex, and consequently actual results may differ from these estimates. Material estimates that are particularly susceptible to significant change in the near term are related to the Company’s losses and loss adjustment expenses, which include amounts estimated for claims incurred but not yet reported. The Company uses various assumptions and actuarial data it believes to be reasonable under the circumstances to make these estimates. In addition, accounting policies specific to reinsurance with retrospective provisions, reinsurance recoverable, deferred income taxes, limited partnership investments, allowance for credit losses, and stock-based compensation expense involve significant judgments and estimates material to the Company’s consolidated financial statements. In the case of assumed business, the Company relies entirely on the ceding insurance company to provide information about premiums, losses, and loss adjustment expenses. When the information is not available at the reporting date, the Company will make estimates based on all recent available data. Accordingly, the actual results could differ significantly from those estimates. All significant intercompany balances and transactions have been eliminated.
Revenue from Claims Processing Services	Revenue from Claims Processing Services Revenue related to claims processing services is included in other revenue in the consolidated statements of income. For the three and six months ended June 30, 2024, revenues from claims processing services were $0 in each period. For the three and six months ended June 30, 2023, revenues from claims processing services were $177 and $704, respectively.
Redeemable Noncontrolling Interests	Redeemable Noncontrolling Interests Redeemable noncontrolling interests represent economic interests in TTIG and CORE not held by HCI. They are presented in the temporary equity (mezzanine) section of the consolidated balance sheets. TTIG The interest in TTIG contains rights in dividends, voting, conversion, participation, liquidation preference and redemption. The redemption feature is not solely within the control of TTIG. The interest is initially recorded at fair value and is decreased by related issuance costs. The fair value is estimated using a residual fair value approach. The effect of increasing dividend rates is accreted to the redeemable noncontrolling interest with a corresponding reduction in retained income. The effective interest method is used for accretion over the period of the increasing dividend rates. The carrying value of the interest is also subsequently adjusted for accrued dividends and dividend payments. The Company has an option to pay the dividends in cash or make a payment-in-kind. The dividends are accrued monthly assuming they will be settled in cash. When the interest is probable of becoming redeemable, the Company elects to recognize changes in the redemption value immediately as it occurs and adjusts the carrying value of the interest to the maximum redemption value which is the higher of the redemption price or fair market value at the reporting date. Such changes in the redemption value are treated as dividends when calculating income available to common stockholders. CORE The interest in CORE represents a refundable portion of CORE’s subscriber surplus contributions. CORE, a reciprocal insurance exchange, collects surplus contributions in addition to policy premiums from its policyholders referred to as subscribers. The purpose of the surplus contribution is to support CORE’s financial strength and lower CORE’s cost of capital. The surplus contribution made during a policy term may be returned on a pro-rata basis to a subscriber in the event of policy cancellation. As the term of an insurance policy progresses, a portion of the surplus contribution is reclassified from the redeemable noncontrolling interest to the noncontrolling interest.
Noncontrolling Interests	Noncontrolling Interests The Company has noncontrolling interests attributable to TTIG and CORE. A noncontrolling interest arises when the Company has less than 100% of the voting rights and economic interests in a subsidiary or a consolidated variable interest entity. The noncontrolling interest in TTIG is periodically adjusted for the expensing of TTIG’s stock-based awards granted to its employees, the interest’s share of TTIG’s net income or loss attributable to common stockholders and the change in other comprehensive income or loss. The noncontrolling interest in CORE is periodically adjusted for the interest’s share of CORE’s net income or loss attributable to common stockholders and the reclassification of surplus contributions from refundable to nonrefundable amount.

Summary of Significant Accounting Policies (Policies)

6 Months Ended

Jun. 30, 2024

The accompanying unaudited consolidated financial statements of HCI Group, Inc. and its majority-owned and controlled subsidiaries (collectively, the “Company”) have been prepared in accordance with accounting principles generally accepted in the United States of America (“U.S. GAAP”) for interim financial information, and the Securities and Exchange Commission (“SEC”) rules for interim financial reporting. Certain information and footnote disclosures normally included in consolidated financial statements prepared in accordance with U.S. GAAP have been omitted pursuant to such rules and regulations. However, in the opinion of management, the accompanying consolidated financial statements reflect all normal recurring adjustments necessary to present fairly the Company’s financial position as of June 30, 2024 and the results of operations and cash flows for the interim periods presented. The results of operations for the interim periods presented are not necessarily indicative of the results of operations to be expected for any subsequent interim period or for the fiscal year ending December 31, 2024. The accompanying unaudited consolidated financial statements and notes thereto should be read in conjunction with the audited consolidated financial statements for the year ended December 31, 2023 included in the Company’s Form 10-K, which was filed with the SEC on March 8, 2024.

In preparing the interim unaudited consolidated financial statements, management was required to make certain judgments, assumptions, and estimates that affect the reported amounts of assets, liabilities, revenues, expenses and related disclosures at the financial reporting date and throughout the periods being reported upon. Certain of the estimates result from judgments that can be subjective and complex, and consequently actual results may differ from these estimates.

Material estimates that are particularly susceptible to significant change in the near term are related to the Company’s losses and loss adjustment expenses, which include amounts estimated for claims incurred but not yet reported. The Company uses various assumptions and actuarial data it believes to be reasonable under the circumstances to make these estimates. In addition, accounting policies specific to reinsurance with retrospective provisions, reinsurance recoverable, deferred income taxes, limited partnership investments, allowance for credit losses, and stock-based compensation expense involve significant judgments and estimates material to the Company’s consolidated financial statements.

In the case of assumed business, the Company relies entirely on the ceding insurance company to provide information about premiums, losses, and loss adjustment expenses. When the information is not available at the reporting date, the Company will make estimates based on all recent available data. Accordingly, the actual results could differ significantly from those estimates.

All significant intercompany balances and transactions have been eliminated.

Revenue from Claims Processing Services

Revenue related to claims processing services is included in other revenue in the consolidated statements of income. For the three and six months ended June 30, 2024, revenues from claims processing services were $0 in each period. For the three and six months ended June 30, 2023, revenues from claims processing services were $177 and $704, respectively.

Redeemable Noncontrolling Interests

Redeemable noncontrolling interests represent economic interests in TTIG and CORE not held by HCI. They are presented in the temporary equity (mezzanine) section of the consolidated balance sheets.

TTIG

The interest in TTIG contains rights in dividends, voting, conversion, participation, liquidation preference and redemption. The redemption feature is not solely within the control of TTIG. The interest is initially recorded at fair value and is decreased by related issuance costs. The fair value is estimated using a residual fair value approach. The effect of increasing dividend rates is accreted to the redeemable noncontrolling interest with a corresponding reduction in retained income. The effective interest method is used for accretion over the period of the increasing dividend rates. The carrying value of the interest is also subsequently adjusted for accrued dividends and dividend payments. The Company has an option to pay the dividends in cash or make a payment-in-kind. The dividends are accrued monthly assuming they will be settled in cash. When the interest is probable of becoming redeemable, the Company elects to recognize changes in the redemption value immediately as it occurs and adjusts the carrying value of the interest to the maximum redemption value which is the higher of the

redemption price or fair market value at the reporting date. Such changes in the redemption value are treated as dividends when calculating income available to common stockholders.

CORE

The interest in CORE represents a refundable portion of CORE’s subscriber surplus contributions. CORE, a reciprocal insurance exchange, collects surplus contributions in addition to policy premiums from its policyholders referred to as subscribers. The purpose of the surplus contribution is to support CORE’s financial strength and lower CORE’s cost of capital. The surplus contribution made during a policy term may be returned on a pro-rata basis to a subscriber in the event of policy cancellation. As the term of an insurance policy progresses, a portion of the surplus contribution is reclassified from the redeemable noncontrolling interest to the noncontrolling interest.

Noncontrolling Interests

The Company has noncontrolling interests attributable to TTIG and CORE. A noncontrolling interest arises when the Company has less than 100% of the voting rights and economic interests in a subsidiary or a consolidated variable interest entity. The noncontrolling interest in TTIG is periodically adjusted for the expensing of TTIG’s stock-based awards granted to its employees, the interest’s share of TTIG’s net income or loss attributable to common stockholders and the change in other comprehensive income or loss. The noncontrolling interest in CORE is periodically adjusted for the interest’s share of CORE’s net income or loss attributable to common stockholders and the reclassification of surplus contributions from refundable to nonrefundable amount.