Document and Entity Information - USD ($)	12 Months Ended
Document and Entity Information - USD ($)	Dec. 31, 2025	Feb. 13, 2026	Jun. 30, 2025
Document and Entity Information [Abstract]
Entity Registrant Name	KINSALE CAPITAL GROUP, INC.
Trading Symbol	KNSL
Entity Listing, Description	Common Stock, par value $0.01 per share
Entity Address, Address Line One	2025 Staples Mill Road
Entity Address, City or Town	Richmond
Entity Address, State or Province	VA
Entity Address, Postal Zip Code	23230
City Area Code	804
Local Phone Number	289-1300
Entity Incorporation, State or Country Code	DE
Entity Central Index Key	0001669162
Current Fiscal Year End Date	--12-31
Document Transition Report	false
Entity File Number	001-37848
Entity Filer Category	Large Accelerated Filer
Entity Emerging Growth Company	false
Entity Small Business	false
Entity Shell Company	false
Document Type	10-K
Document Annual Report	true
Document Period End Date	Dec. 31, 2025
Document Fiscal Year Focus	2025
Document Fiscal Period Focus	FY
Amendment Flag	false
Entity Common Stock, Shares Outstanding		23,153,066
Entity Well-known Seasoned Issuer	Yes
Entity Voluntary Filers	No
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Public Float			$ 9,978,331,145
Security Exchange Name	NYSE
Entity Tax Identification Number	98-0664337
ICFR Auditor Attestation Flag	true
Auditor Name	KPMG LLP
Auditor Location	Richmond, VA
Auditor Firm ID	185
Documents Incorporated by Reference	Portions of the registrant’s definitive proxy statement relating to its 2026 annual meeting of stockholders (the "2026 Proxy Statement") are incorporated by reference into Part III of this Annual Report on Form 10-K. The 2026 Proxy Statement will be filed with the Securities and Exchange Commission within 120 days after the end of the fiscal year covered by this Annual Report on Form 10-K.
Document Financial Statement Error Correction [Flag]	false

Consolidated Balance Sheets - USD ($) $ in Thousands	Dec. 31, 2025	Dec. 31, 2024
Investments:
Fixed-maturity securities available-for-sale, at fair value (amortized cost: $4,382,725 allowance for credit loss: $29 – 2025; $3,663,031 and $27 – 2024)	$ 4,341,450	$ 3,537,563
Equity securities, at fair value (cost: $482,926 – 2025; $313,722 – 2024)	626,399	398,359
Real Estate Investments, Net	55,236	15,045
Short-Term Investments	3,864	3,714
Total investments	5,026,949	3,954,681
Cash, Cash Equivalent, Restricted Cash, and Restricted Cash Equivalent, Continuing Operation	163,361	113,213
Investment income due and accrued	30,971	27,366
Premiums and fees receivable, net of allowance for credit losses of $27,328 in 2025 and $26,926 in 2024	124,593	140,027
Reinsurance recoverables, net of allowance for credit losses of $1,072 in 2025 and $932 in 2024	394,329	337,891
Ceded unearned premiums	44,506	52,736
Deferred policy acquisition costs, net of ceding commissions	118,737	109,263
Intangible assets	3,538	3,538
Deferred income tax asset, net	42,191	60,215
Other assets	94,386	87,774
Total assets	6,043,561	4,886,704
Liabilities:
Gross reserves for unpaid losses and loss adjustment expenses, beginning of year	2,890,870	2,285,668
Unearned premiums	860,394	828,449
Payable to reinsurers	34,385	43,959
Accounts payable and accrued expenses	66,301	55,159
Long-Term Debt	224,397	184,122
Other liabilities	7,631	5,786
Total liabilities	4,083,978	3,403,143
Contingencies
Common stock, shares issued (in shares)	23,380,413	23,294,783
Stockholders' equity:
Common stock, $0.01 par value, 400,000,000 shares authorized, 23,380,413 shares issued and 23,145,751 shares outstanding at December 31, 2025; 23,294,783 shares issued and 23,272,157 shares outstanding at December 31, 2024	$ 234	$ 233
Additional paid-in capital	373,681	361,398
Retained earnings	1,716,945	1,229,136
Accumulated other comprehensive loss	$ (30,692)	$ (97,206)
Treasury Stock, Common, Shares	234,662	22,626
Treasury Stock, Value	$ (100,585)	$ (10,000)
Stockholders' equity	1,959,583	1,483,561
Total liabilities and stockholders' equity	$ 6,043,561	$ 4,886,704
Common stock, par value (in dollars per share)	$ 0.01	$ 0.01
Common stock, shares authorized (in shares)	400,000,000	400,000,000
Common stock, shares outstanding (in shares)	23,145,751	23,272,157
Debt Securities, Available-for-Sale, Allowance for Credit Loss, Excluding Accrued Interest	$ 29	$ 27

Consolidated Balance Sheets - (Parenthetical) - USD ($) $ in Thousands	Dec. 31, 2025	Dec. 31, 2024
Investments:
Amortized cost	$ 4,382,725	$ 3,663,031
Debt Securities, Available-for-Sale, Allowance for Credit Loss, Excluding Accrued Interest	29	27
Equity securities - cost	482,926	313,722
Allowance for credit losses	27,328	26,926
Reinsurance Recoverable, Allowance for Credit Loss	$ 1,072	$ 932
Stockholders' equity:
Common stock, par value (in dollars per share)	$ 0.01	$ 0.01
Common stock, shares authorized (in shares)	400,000,000	400,000,000
Common stock, shares issued (in shares)	23,380,413	23,294,783
Common stock, shares outstanding (in shares)	23,145,751	23,272,157

Consolidated Statements of Income and Comprehensive Income - USD ($) shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Revenues:
Gross written premiums	$ 1,977,171	$ 1,870,341	$ 1,568,815
Ceded written premiums	(361,154)	(392,993)	(304,185)
Net written premiums	1,616,017	1,477,348	1,264,630
Change in unearned premiums	(40,175)	(126,878)	(192,093)
Net earned premiums	1,575,842	1,350,470	1,072,537
Insurance Fee Income	40,714	34,118	27,026
Net investment income	192,192	150,287	102,335
Change in the fair value of equity securities	58,836	43,367	15,277
Net realized investment gains	4,390	6,831	6,040
Change in allowance for credit losses on investments	(2)	526	(187)
Other income	2,015	1,926	1,421
Total revenues	1,873,987	1,587,525	1,224,449
Expenses:
Losses and loss adjustment expenses	890,693	772,899	600,219
Underwriting, acquisition and insurance expenses	336,696	285,808	228,970
Interest expense	10,646	10,134	10,301
Other expenses	1,650	3,968	942
Total expenses	1,239,685	1,072,809	840,432
Income before income taxes	634,302	514,716	384,017
Income tax expense	130,688	99,873	75,924
Net income	503,614	414,843	308,093
Other comprehensive income (loss):
Change in unrealized gains (losses) on available-for-sale investments, net of taxes	66,514	(2,589)	40,301
Total comprehensive income	$ 570,128	$ 412,254	$ 348,394
Earnings per share:
Basic	$ 21.76	$ 17.92	$ 13.37
Diluted	$ 21.65	$ 17.78	$ 13.22
Weighted-average common shares outstanding:
Basic	23,140	23,153	23,045
Diluted	23,259	23,332	23,307

Consolidated Statements of Changes in Stockholders' Equity - USD ($) $ in Thousands	Total	Common Stock [Member]	Additional Paid-in Capital [Member]	Retained Earnings [Member]	Accumulated Other Comprehensive Income (Loss) [Member]	Treasury Stock, Common
Balance, shares at Dec. 31, 2022		23,090,526
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stock-based compensation, shares		104,949
Restricted shares withheld for taxes, shares		(13,556)
Balance, shares at Dec. 31, 2023		23,181,919
Balance at Dec. 31, 2022	$ 745,449	$ 231	$ 347,015	$ 533,121	$ (134,918)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of stock under stock-based compensation plan	877	1	876
Stock-based compensation expense	9,361		9,361
Restricted shares withheld for taxes	$ (4,282)		(4,282)
Dividends declared, per share	$ 0.56
Dividends declared	$ (12,967)			(12,967)
Other comprehensive income (loss), net of income tax	40,301				40,301
Net income	308,093			308,093
Balance at Dec. 31, 2023	$ 1,086,832	$ 232	352,970	828,247	(94,617)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stock-based compensation, shares		127,265
Restricted shares withheld for taxes, shares		(14,401)
Treasury Stock, Shares, Acquired		(22,626)
Balance, shares at Dec. 31, 2024	23,272,157	23,272,157
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of stock under stock-based compensation plan	$ 1,330	$ 1	1,329
Stock-based compensation expense	14,146		14,146
Restricted shares withheld for taxes	$ (7,047)		(7,047)
Dividends declared, per share	$ 0.60
Dividends declared	$ (13,954)			(13,954)
Other comprehensive income (loss), net of income tax	(2,589)				(2,589)
Net income	414,843			414,843
Treasury Stock, Value, Acquired, Cost Method	(10,000)					$ (10,000)
Balance at Dec. 31, 2024	$ 1,483,561	$ 233	361,398	1,229,136	(97,206)	10,000
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stock-based compensation, shares		100,166
Restricted shares withheld for taxes, shares		(14,536)
Treasury Stock, Shares, Acquired		(212,036)
Balance, shares at Dec. 31, 2025	23,145,751	23,145,751
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of stock under stock-based compensation plan	$ 681	$ 1	680
Stock-based compensation expense	17,884		17,884
Restricted shares withheld for taxes	$ (6,281)		(6,281)
Dividends declared, per share	$ 0.68
Dividends declared	$ (15,805)			(15,805)
Other comprehensive income (loss), net of income tax	66,514				66,514
Net income	503,614			503,614
Treasury Stock, Value, Acquired, Cost Method	(90,585)					(90,585)
Balance at Dec. 31, 2025	$ 1,959,583	$ 234	$ 373,681	$ 1,716,945	$ (30,692)	$ 100,585

Consolidated Statements of Changes in Stockholders' Equity (Parentheticals) - $ / shares	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Statement of Stockholders' Equity [Abstract]
Dividends declared, per share	$ 0.68	$ 0.60	$ 0.56

Consolidated Statements of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Operating activities:
Net income	$ 503,614	$ 414,843	$ 308,093
Adjustments to reconcile net income to net cash provided by operating activities:
Change in fair value of equity securities	(58,836)	(43,367)	(15,277)
Net investment gains	(4,390)	(6,831)	(6,040)
Change in allowance for credit losses on investments	(2)	526	(187)
Deferred tax (benefit) expense	343	(3,828)	(9,429)
Depreciation and amortization	5,834	5,802	3,274
Stock compensation expense	17,884	14,146	9,361
Change in operating assets and liabilities:
Investment income due and accrued	(3,605)	(5,677)	(7,238)
Premiums receivable, net	15,434	3,185	(37,458)
Reserves for unpaid loss and loss adjustment expenses	605,202	592,793	454,473
Unearned premiums	31,945	127,098	201,674
Reinsurance balances, net	(57,782)	(93,898)	(21,405)
Deferred policy acquisition costs	(9,474)	(20,868)	(26,801)
Income taxes (recoverable) payable	761	(359)	742
Accounts payable and accrued expenses	10,861	8,936	12,519
Other	(14,055)	(15,148)	(6,840)
Net cash provided by operating activities	1,043,738	976,301	859,835
Investing Activities:
Purchase of property and equipment	(53,685)	(23,943)	(6,607)
Purchase of real estate investment	0	(312)	(2,116)
Sale of property and equipment	0	0	62,036
Payments for (Proceeds from) Short-Term Investments	559	2,056	36,706
Purchases - fixed-maturity securities	(2,494,190)	(1,557,541)	(1,317,048)
Purchases - equity securities	(183,234)	(156,477)	(86,605)
Sales - fixed-maturity securities	1,167,652	289,360	245,618
Sales - equity securities	14,585	34,380	30,623
Maturities and calls - fixed-maturity securities	626,103	452,352	176,501
Net cash provided by (used in) investing activities	(922,210)	(960,125)	(860,892)
Financing activities:
Proceeds from Lines of Credit	40,000	0	0
Repayments of Long-Term Lines of Credit	0	0	(62,000)
Debt issuance costs	0	0	(164)
Proceeds from Issuance of Long-Term Debt	0	0	50,000
Payroll taxes withheld and remitted on share-based payments	(6,281)	(7,047)	(4,282)
Common stock issued, stock options exercised	681	1,330	877
Dividends paid	(15,782)	(13,940)	(12,954)
Payments for Repurchase of Common Stock	(89,998)	(10,000)	0
Net cash provided by (used in) financing activities	(71,380)	(29,657)	(28,523)
Cash, Cash Equivalents, Restricted Cash, and Restricted Cash Equivalents, Beginning Balance	113,213	126,694	156,274
Net change in cash and cash equivalents	50,148	(13,481)	(29,580)
Cash, Cash Equivalent, Restricted Cash, and Restricted Cash Equivalent, Continuing Operation	163,361	113,213	126,694
Income Taxes Paid, Net	$ 129,600	$ 104,100	$ 84,600

Description of business	12 Months Ended
Description of business	Dec. 31, 2025
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Description of business	Description of business Kinsale Capital Group, Inc., an insurance holding company, is a Delaware corporation that was formed in 2009 and conducts its operations through its wholly-owned subsidiaries (referred to as "Kinsale" or, with its subsidiaries, the "Company"). Kinsale Capital Group, Inc. writes excess and surplus lines insurance on a non-admitted basis principally through its insurance subsidiary, Kinsale Insurance Company ("Kinsale Insurance"), which is authorized to write business in 50 states, the District of Columbia, the Commonwealth of Puerto Rico and the U.S. Virgin Islands. Kinsale Capital Group, Inc. also markets certain products through its subsidiary, Aspera Insurance Services, Inc. ("Aspera"), an insurance broker.

Summary of significant accounting policies

12 Months Ended

Dec. 31, 2025

Accounting Policies [Abstract]

Summary of significant accounting policies

Principles of consolidation

The accompanying consolidated financial statements include the accounts of Kinsale Capital Group, Inc. and its wholly-owned subsidiaries. All significant intercompany balances and transactions have been eliminated in consolidation. Certain prior year amounts have been reclassified to conform to the current year's presentation.

Use of estimates

The preparation of consolidated financial statements in conformity with U.S. generally accepted accounting principles ("U.S. GAAP") requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities, disclosure of contingent assets and liabilities, if any, at the date of the consolidated financial statements and the reported amounts of revenues and expenses during the reporting period. Actual results could differ from those estimates. Management periodically reviews its estimates and assumptions. These reviews include evaluating the adequacy of reserves for unpaid losses and loss adjustment expenses, allowance for credit losses and uncollectible reinsurance, fair value of investments, as well as evaluating the investment portfolio for credit impairments.

Cash and cash equivalents

The Company considers all highly liquid investments with an original maturity of three months or less to be cash equivalents.

Short-term investments

Short-term investments are carried at amortized cost, which approximates fair value. Short-term investments have maturities greater than three months but less than one year at the date of purchase.

Fixed-maturity and equity securities

Fixed-maturity securities are classified as available-for-sale and reported at fair value. Unrealized gains and losses on these securities are excluded from earnings but are recorded as a separate component of other comprehensive income and stockholders' equity, net of deferred income taxes.

Equity securities are reported at fair value. Changes in unrealized gains and losses in fair value of these investments are recognized in net income.

The Company regularly reviews all its available-for-sale investments with unrealized losses to assess whether the decline in the fair value is deemed to be a credit loss. See Note 2 for further discussion regarding the determination of credit losses.

Interest on fixed-maturity securities is credited to earnings as it accrues. Premiums and discounts are amortized or accreted using the effective interest method over the lives of the related fixed maturities, or to the earliest call date for

securities purchased at a premium. This method includes an adjustment for estimated principal prepayments, if any, on asset- and mortgage-backed securities. To the extent that the estimated lives of such securities change as a result of changes in estimated prepayment rates, the adjustments are included in net investment income using the retrospective method.

Dividends on equity securities are included in earnings on the ex-dividend date.

Realized gains and losses on disposition of investments are based on specific identification of the investments sold on the trade date.

Real estate investments

Real estate investments include real estate and the related assets purchased for investment purposes. Real estate and the related depreciable assets are carried at cost, net of accumulated depreciation. Depreciation is calculated on a straight-line basis over the estimated useful life of the assets and is included in net investment income. Rental income is recognized on a straight-line basis over the term of the respective lease and is included in net investment income. Land is not depreciated. Real estate is evaluated for impairment when events or circumstances indicate the carrying value of the real estate may not be recoverable.

Reinsurance

Reinsurance premiums, commissions, and ceded unearned premiums on reinsured business are accounted for on a basis consistent with that used in accounting for the original policies issued and the terms of the reinsurance contracts. The Company receives ceding commissions in accordance with certain reinsurance treaties. The ceding commissions are capitalized and amortized as a reduction of underwriting, acquisition and insurance expenses.

Reinsurance recoverables represent paid losses and loss adjustment expenses and reserves for unpaid losses and loss adjustment expenses ceded to reinsurers that are subject to reimbursement under reinsurance treaties. The method for determining reinsurance recoverables for unpaid losses and loss adjustment expenses involves reviewing actuarial estimates of gross unpaid losses and loss adjustment expenses to determine the Company's ability to cede unpaid losses and loss adjustment expenses under the Company's existing reinsurance contracts. This method is continually reviewed and updated and any resulting adjustments are reflected in earnings in the period identified. See Note 8 for a further discussion of the Company's reinsurance program.

Premiums receivable, net

Premiums receivable balances are carried at face value, net of any allowance for credit losses. The allowance for credit losses represents an estimate of amounts considered uncollectible based on the Company’s assessment of the collectability of receivables that are past due. The estimate considers historical loss data, current and future economic conditions and specific identification of collectability concerns where applicable. The following table presents the rollforward of the allowance for credit losses for premiums receivable for the years ended December 31, 2025 and 2024:


	Year Ended December 31,
	2025		2024
	(in thousands)
Beginning balance	$	26,926	$	13,383
Current period change for estimated uncollectible premiums	10,503		17,397
Write-offs of uncollectible premiums receivable	(10,101)		(3,854)

Ending balance	$	27,328	$	26,926

Deferred policy acquisition costs, net of ceding commissions

The Company defers commissions, net of ceding commissions, and certain other costs that are directly related to the successful acquisition of insurance contracts. All eligible costs are capitalized and charged to expense in proportion to premium earned over the estimated policy life. To the extent that unearned premiums on existing policies are not adequate to cover the related costs and expenses, referred to as a premium deficiency, deferred policy acquisition costs are charged to earnings. The Company considers anticipated investment income in determining whether a premium deficiency exists.

Property and equipment, net

Property and equipment are stated at cost less accumulated depreciation. Depreciation of property and equipment is calculated using the straight-line method over the estimated useful lives of the assets. The estimated useful lives range from 39 years for the building and parking deck, 15 to 20 years for land improvements, 7 to 10 years for furniture and equipment, and 3 to 7 years for electronic data processing hardware and software.

Property and equipment are included in other assets in the accompanying consolidated balance sheets and consists of the following:


	December 31,
	2025		2024
	(in thousands)
Building	$	66,763	$	37,190
Parking deck	—		5,072
Land	—		3,068
Equipment	5,375		4,401
Software	27,136		20,203
Furniture and fixtures	6,157		3,200
Leasehold improvements	—		153
Land improvements	129		474
Construction in progress - building	376		26,530
	105,936		100,291
Accumulated depreciation	(16,505)		(17,367)
Total property and equipment, net	$	89,431	$	82,924

In 2024, construction in progress included capitalized expenses related to the development of the Company's new corporate headquarters building. Construction of the new headquarters building was substantially completed in the fourth quarter of 2025 and was placed into service. Upon moving operations to the new headquarters, the Company reclassified its former headquarters and related assets from property and equipment to real estate investments due to a change in the intended use of the former property.

Indefinite-lived intangible assets

Indefinite-lived intangible assets are recorded at fair value at the date of acquisition. The Company's indefinite-lived intangible assets are comprised solely of regulatory approvals granted by the various state insurance departments to write insurance business in the respective states on a non-admitted basis. In accordance with U.S. GAAP, amortization of indefinite-lived intangible assets is not permitted. Indefinite-lived intangible assets are tested for impairment during the fourth quarter on an annual basis, or earlier if there is reason to suspect that their values may have been diminished or impaired. There were no impairments recognized in December 31, 2025, 2024, or 2023. In addition, as of December 31, 2025, no triggering events occurred that suggested an updated review was necessary.

Reserves for unpaid losses and loss adjustment expenses

Reserves for unpaid losses and loss adjustment expenses represent management's best estimate of ultimate unpaid cost of all reported and unreported losses and loss adjustment expenses incurred prior to the financial statement date. The estimates are based on several actuarial methods that use a variety of inputs including initial expected loss ratios, loss

development patterns, paid losses, reported losses, claim counts and price indices. All estimates are regularly reviewed and, as experience develops and new information becomes known, the reserves for unpaid losses and loss adjustment expenses are adjusted as necessary. Such adjustments are reflected in the results of operations in the period in which they are determined. Although management believes that the reserves for losses and loss adjustment expenses are reasonable, due to the inherent uncertainty in estimating reserves for unpaid losses and loss adjustment expenses, it is possible that the Company’s actual incurred losses and loss adjustment expenses will not develop in a manner consistent with the assumptions inherent in the determination of these reserves. If actual liabilities exceed recorded amounts, there will be an increase to the Company’s reserves resulting in a reduction in net income and stockholders’ equity in the period in which the deficiency is identified. Furthermore, management may determine that recorded reserves are more than adequate to cover expected losses which will result in a reduction to the reserves. The Company believes that the reserves for unpaid losses and loss adjustment expenses at December 31, 2025 and 2024 are adequate and represent a reasonable estimate of the Company's future obligations. See Note 7 for a further discussion of reserves for unpaid losses and loss adjustment expenses.

Revenue recognition

Premiums are recognized as revenue ratably over the term of the insurance contracts, net of ceded reinsurance. Unearned premiums are calculated on a daily pro rata basis. Fee income is recognized as revenue when the related premium is written.

Income taxes

Deferred income tax assets and liabilities are determined based on the differences between the recorded amounts and the tax bases of assets and liabilities, using enacted tax rates expected to be in effect during the year in which the basis differences reverse. The effect on deferred taxes of a change in tax rates is recognized in income in the period in which such change was enacted. Valuation allowances on deferred tax assets are estimated based on the Company's assessment of the realizability of such amounts. Valuation allowances are recorded when it is more likely than not that some portion, or all, of the deferred tax assets will not be realizable.

The Company provides for uncertain tax positions, and the related interest and penalties, based upon management’s assessment of whether a tax benefit is more likely than not to be sustained upon examination by tax authorities. To the extent that the anticipated tax outcome of these uncertain tax positions changes, such changes in estimate will impact the income tax provision in the period in which such determination is made. The Company recognizes accrued interest and penalties related to uncertain tax positions as a component of income tax expense.

The Company uses the portfolio approach to release stranded tax effects in accumulated other comprehensive income ("AOCI") related to its available-for-sale fixed-maturity securities. Under this approach, stranded tax effects remaining in AOCI are released only when the entire portfolio of the available-for-sale fixed-maturity securities are liquidated, sold or extinguished.

Contingencies

Liabilities for loss contingencies, arising from noninsurance policy claims, assessments, litigation, fines, and penalties and other sources, are recorded when it is probable that a liability has been incurred and the amount of the assessment and/or remediation can be reasonably estimated. Legal costs incurred in connection with loss contingencies are expensed as incurred.

Fair value of financial instruments

Fair value is estimated for each class of financial instrument based on the framework established in the fair value accounting guidance. This guidance requires an entity to maximize the use of observable inputs and minimize the use of unobservable inputs when measuring fair value. Fair value hierarchy disclosures are based on the quality of inputs used to measure fair value. The hierarchy gives the highest priority to unadjusted quoted prices in active markets for identical assets or liabilities (Level 1 measurements) and the lowest priority to unobservable inputs (Level 3 measurements).

See Note 3 for further details regarding fair value disclosures.

Stock-based compensation

Stock-based compensation is expensed based upon the estimated fair value of employee stock awards. Compensation cost for awards of equity instruments to employees is measured based on the grant-date fair value of those awards and compensation expense is recognized over the service period that the awards vest. Forfeitures of stock-based compensation awards are recognized as they occur. See Note 9 for further discussion and related disclosures regarding stock-based compensation.

Recently adopted accounting pronouncements

Accounting Standards Update ("ASU") 2023-09 – Income Taxes (Topic 740): Improvements to Income Tax Disclosures

In December 2023, the FASB issued ASU 2023-09, "Income Taxes (Topic 740): Improvements to Income Tax Disclosures". The amended guidance enhances income tax disclosures primarily related to the effective tax rate reconciliation and income taxes paid information. This guidance requires disclosure of specific categories in the effective tax rate reconciliation and additional information on reconciling items meeting a quantitative threshold. In addition, the amended guidance requires disaggregating income taxes paid (net of refunds received) by federal, state, and foreign taxes. It also requires disaggregating individual jurisdictions in which income taxes paid (net of refunds received) are equal to or greater than 5 percent of total income taxes paid (net of refunds received). The amended guidance became effective for the year ended December 31, 2025. Refer to Note 6 for the Company's income tax disclosures.

Prospective accounting pronouncements

ASU 2024-03, Income Statement – Reporting Comprehensive Income – Expense Disaggregation Disclosures

In November 2024, the FASB issued ASU 2024-03, "Income Statement-Reporting Comprehensive Income-Expense Disaggregation Disclosures (Subtopic 220-40): Disaggregation of Income Statement Expenses," requiring public entities to disclose additional information about specific expense categories in the notes to the financial statements on an interim and annual basis. ASU 2024-03 is effective for fiscal years beginning after December 15, 2026, and for interim periods beginning after December 15, 2027, with early adoption permitted. The Company is currently evaluating the effect the guidance will have on its disclosures.

ASU 2025-06, Intangibles – Goodwill and Other – Internal-Use Software

In September 2025, the FASB issued ASU 2025-06, "Intangibles – Goodwill and Other – Internal-Use Software (Subtopic 350-40) Targeted Improvements to the Accounting for Internal-Use Software," to modernize the accounting for software costs that are accounted for under Subtopic 350-40, Intangibles – Goodwill and Other – Internal-Use Software. ASU 2025-06 is effective for fiscal years beginning after December 15, 2027, and for interim periods beginning after December 15, 2027, with early adoption permitted. The Company is currently evaluating the effect the guidance will have on its financial statements.

Investments

12 Months Ended

Dec. 31, 2025

Investments [Abstract]

Investments

Available-for-sale investments

The following tables summarize the Company’s available-for-sale investments at December 31, 2025 and 2024:


	December 31, 2025
	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses		Allowance for Credit Losses		Estimated Fair Value
	(in thousands)
Fixed maturities:
U.S. Treasury securities and obligations of U.S. government agencies	$	861	$	14	$	(1)	$	—	$	874
Obligations of states, municipalities and political subdivisions	146,222		51		(18,410)		(3)		127,860
Corporate and other securities	1,711,348		28,798		(26,232)		(26)		1,713,888
Asset-backed securities	582,780		6,377		(638)		—		588,519
Residential mortgage-backed securities	1,491,642		6,378		(38,750)		—		1,459,270
Commercial mortgage-backed securities	449,872		3,632		(2,465)		—		451,039
Total fixed-maturity investments	$	4,382,725	$	45,250	$	(86,496)	$	(29)	$	4,341,450


	December 31, 2024
	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses		Allowance for Credit Losses		Estimated Fair Value
	(in thousands)
Fixed maturities:
U.S. Treasury securities and obligations of U.S. government agencies	$	15,465	$	—	$	(417)	$	—	$	15,048
Obligations of states, municipalities and political subdivisions	168,894		46		(22,633)		(3)		146,304
Corporate and other securities	2,037,372		5,779		(53,638)		(23)		1,989,490
Asset-backed securities	729,658		4,606		(1,522)		—		732,742
Residential mortgage-backed securities	502,121		747		(53,994)		—		448,874
Commercial mortgage-backed securities	209,521		423		(4,838)		(1)		205,105
Total fixed-maturity investments	$	3,663,031	$	11,601	$	(137,042)	$	(27)	$	3,537,563

Available-for-sale investments in a loss position

The Company regularly reviews all its available-for-sale investments with unrealized losses to assess whether the decline in the fair value is deemed to be a credit loss. The Company considers a number of factors in completing its review of credit losses, including the extent to which a security's fair value has been below cost and the financial condition of an issuer. In addition to specific issuer information, the Company also evaluates the current market and interest rate environment. Generally, a change in a security’s value caused by a change in the market or interest rate environment does not constitute a credit loss.

For fixed-maturity securities, the Company also considers whether it intends to sell the security or if it is more likely than not that it will be required to sell the security before recovery and the ability to recover all amounts outstanding when contractually due. When assessing whether it intends to sell a fixed-maturity security or if it is likely to be required to sell a fixed-maturity security before recovery of its amortized cost, the Company evaluates facts and circumstances including, but not limited to, decisions to reposition the investment portfolio, potential sales of investments to meet cash flow needs and potential sales of investments to capitalize on favorable pricing.

For fixed-maturity securities where a decline in fair value is below the amortized cost basis and the Company intends to sell the security, or it is more likely than not that the Company will be required to sell the security before recovery of its amortized cost, an impairment is recognized in net income based on the fair value of the security at the time of assessment. For fixed-maturity securities that the Company does not intend to sell or for which it is more likely than not that the Company would not be required to sell before recovery of its amortized cost, the Company compares the estimated present value of the cash flows expected to be collected to the amortized cost of the security. Inputs into the present value cash flow analysis include default rates and recoverability rates based on credit rating. The extent to which the estimated present value of the cash flows expected to be collected is less than the amortized cost of the security represents the credit-related portion of the impairment, which is recognized in net income through an allowance for credit losses. Any remaining decline in fair value represents the noncredit portion of the impairment, which is recognized in other comprehensive income.

The Company reports investment income due and accrued separately from fixed-maturity securities, available for sale, and has elected not to measure an allowance for credit losses for investment income due and accrued. Investment income due and accrued is written off through earnings at the time the issuer of the bond defaults or is expected to default on payments.

As of December 31, 2025, the Company's credit loss review resulted in an allowance for credit losses on three securities. The following table presents changes in the allowance for expected credit losses on available-for-sale securities:


	Years Ended December 31,
	2025		2024
	(in thousands)
Beginning balance	$	27	$	553
Increase to allowance from securities for which credit losses were not previously recorded	—		3
Reduction from securities sold during the period	(14)		(479)
Net increase (decrease) from securities that had an allowance at the beginning of the period	16		(50)
Ending balance	$	29	$	27

The following tables summarize gross unrealized losses and estimated fair value for available-for-sale investments by length of time that the securities have continuously been in an unrealized loss position:


	December 31, 2025
	Less than 12 Months				12 Months or Longer				Total
	Estimated Fair Value		Gross Unrealized Losses		Estimated Fair Value		Gross Unrealized Losses		Estimated Fair Value		Gross Unrealized Losses
	(in thousands)
Fixed maturities:
U.S. Treasury securities and obligations of U.S. government agencies	$	296	$	(1)	$	—	$	—	$	296	$	(1)
Obligations of states, municipalities and political subdivisions	1,043		(2)		118,027		(18,408)		119,070		(18,410)
Corporate and other securities	101,385		(597)		239,152		(25,635)		340,537		(26,232)
Asset-backed securities	92,682		(384)		7,759		(254)		100,441		(638)
Residential mortgage-backed securities	387,397		(779)		228,531		(37,971)		615,928		(38,750)
Commercial mortgage-backed securities	103,868		(296)		44,139		(2,169)		148,007		(2,465)
Total fixed-maturity investments	$	686,671	$	(2,059)	$	637,608	$	(84,437)	$	1,324,279	$	(86,496)

At December 31, 2025, in addition to the securities included in the allowance for credit losses, the Company held 592 fixed-maturity securities with a total estimated fair value of $1.3 billion and gross unrealized losses of $86.5 million. Of those securities, 483 were in a continuous unrealized loss position for greater than one year. As discussed above, the Company regularly reviews all fixed-maturity securities within its investment portfolio to determine whether a credit loss has occurred. Based on the Company's review as of December 31, 2025, except for securities previously discussed, the securities in unrealized loss positions were caused by interest rate changes or other market factors and were not credit-specific issues, nor did the Company intend to sell these securities. At December 31, 2025, 81.9% of the Company’s fixed-maturity securities were rated "A-" or better and all of Company's fixed-maturity securities made expected coupon payments under the contractual terms of the securities.


	December 31, 2024
	Less than 12 Months				12 Months or Longer				Total
	Estimated Fair Value		Gross Unrealized Holding Losses		Estimated Fair Value		Gross Unrealized Holding Losses		Estimated Fair Value		Gross Unrealized Holding Losses
	(in thousands)
Fixed maturities:
U.S. Treasury securities and obligations of U.S. government agencies	$	838	$	(13)	$	14,210	$	(404)	$	15,048	$	(417)
Obligations of states, municipalities and political subdivisions	27,049		(417)		114,620		(22,216)		141,669		(22,633)
Corporate and other securities	667,645		(9,139)		493,598		(44,499)		1,161,243		(53,638)
Asset-backed securities	121,371		(943)		24,656		(579)		146,027		(1,522)
Residential mortgage-backed securities	144,955		(1,934)		237,514		(52,060)		382,469		(53,994)
Commercial mortgage-backed securities	92,024		(960)		53,812		(3,878)		145,836		(4,838)
Total fixed-maturity investments	$	1,053,882	$	(13,406)	$	938,410	$	(123,636)	$	1,992,292	$	(137,042)

Contractual maturities of available-for-sale fixed-maturity securities

The amortized cost and estimated fair value of available-for-sale fixed-maturity securities at December 31, 2025 are summarized, by contractual maturity, as follows:


	Amortized		Estimated
	Cost		Fair Value
	(in thousands)
Due in one year or less	$	14,324	$	14,392
Due after one year through five years	868,804		879,532
Due after five years through ten years	695,323		700,466
Due after ten years	279,980		248,232
Asset-backed securities	582,780		588,519
Residential mortgage-backed securities	1,491,642		1,459,270
Commercial mortgage-backed securities	449,872		451,039
Total fixed maturities	$	4,382,725	$	4,341,450

Expected maturities may differ from contractual maturities because borrowers may have the right to call or prepay obligations with or without call or prepayment penalties, and the lenders may have the right to put the securities back to the borrower.

Real estate investments

Real estate investments represents directly owned property held for investment purposes. In December 2025, the Company reclassified its former headquarters and related assets to real estate investments. Accumulated depreciation on real estate investments was $5.7 million at December 31, 2025. There was no accumulated depreciation at December 31, 2024 as real estate investments consisted of land.

Net investment income

The following table presents the components of net investment income:


	Year Ended December 31,
	2025		2024		2023
	(in thousands)
Interest:
Taxable bonds	$	180,911	$	143,242	$	92,227
Municipal bonds (tax exempt)	1,390		1,592		2,217
Cash equivalents and short-term investments	6,185		3,012		3,004
Dividends on equity securities	8,602		6,442		5,097
Real estate investment income	—		153		3,716
Gross investment income	197,088		154,441		106,261
Investment expenses	(4,896)		(4,154)		(3,926)
Net investment income	$	192,192	$	150,287	$	102,335

There was no depreciation expense related to real estate investments for the years ended December 31, 2025 and 2024 as the depreciable assets were in use by the Company prior to December 31, 2025. Investment expenses included depreciation expense related to real estate investments of $0.5 million for the year ended December 31, 2023.

Realized investment gains and losses

The following table presents realized investment gains and losses:


	Year Ended December 31,
	2025		2024		2023
	(in thousands)
Fixed-maturity securities:
Realized gains	$	8,506	$	1,151	$	1,852
Realized losses	(4,673)		(1,131)		(2,374)
Net realized gains (losses) from fixed-maturity securities	3,833		20		(522)

Equity securities:
Realized gains	2,465		7,271		7,678
Realized losses	(1,910)		(455)		(5,329)
Net realized gains from equity securities	555		6,816		2,349

Realized gains (losses) from the sales of short-term investments	2		—		(37)
Realized (losses) gains on sale of real estate investments	—		(5)		4,250
Net realized investment gains	$	4,390	$	6,831	$	6,040

The net realized gains or losses on sales of equity securities represent the total gains or losses from the purchase dates of the equity securities. The change in unrealized gains (losses) in the consolidated statement of income consists of two components: (1) the reversal of the gain or loss recognized in previous periods on equity securities sold and (2) the change in unrealized gain or loss resulting from mark-to-market adjustments on equity securities still held.

Change in net unrealized gains (losses) on fixed-maturity securities

The change in net unrealized gains (losses) for fixed-maturity securities was $84.2 million, $(3.3) million, and $51.0 million for the years ended December 31, 2025, 2024, and 2023, respectively.

Insurance – statutory deposits

The Company had invested assets with a carrying value of $3.9 million and $3.7 million on deposit with state regulatory authorities at December 31, 2025 and 2024, respectively.

Payable for investments purchased

The Company did not have a payable for investments purchased at December 31, 2025 or 2024.

Fair value measurements

12 Months Ended

Dec. 31, 2025

Fair Value Disclosures [Abstract]

Fair value measurements

Fair value is estimated for each class of financial instrument based on the framework established in the fair value accounting guidance. Fair value is defined as the price in the principal market that would be received for an asset or paid to transfer a liability to facilitate an orderly transaction between market participants on the measurement date. Market participants are assumed to be independent, knowledgeable, able and willing to transact an exchange and not acting under duress. Fair value hierarchy disclosures are based on the quality of inputs used to measure fair value. The hierarchy gives the highest priority to unadjusted quoted prices in active markets for identical assets or liabilities (Level 1 measurements) and the lowest priority to unobservable inputs (Level 3 measurements). Adjustments to transaction prices or quoted market prices may be required in illiquid or disorderly markets in order to estimate fair value.

The three levels of the fair value hierarchy are defined as follows:

Level 1 - Inputs to the valuation methodology are quoted prices (unadjusted) for identical assets or liabilities traded in active markets.

Level 2 - Inputs to the valuation methodology include quoted prices for similar assets or liabilities in active markets, quoted prices for identical or similar assets or liabilities in markets that are not active, inputs other than quoted prices that are observable for the asset or liability and market-corroborated inputs.

Level 3 - Inputs to the valuation methodology are unobservable for the asset or liability and are significant to the fair value measurement.

Fair values of the Company's investment portfolio are estimated using unadjusted prices obtained by its investment accounting vendor from nationally recognized third-party pricing services, where available. Values for U.S. Treasuries, exchange traded funds and common stocks are generally based on Level 1 inputs which use quoted prices in active markets for identical assets. For other fixed-maturity securities and non-redeemable preferred stock, the pricing vendors use a pricing methodology involving the market approach, including pricing models which use prices and relevant market information regarding a particular security or securities with similar characteristics to establish a valuation. The estimates of fair value of these investments are included in the amounts disclosed as Level 2. For those investments where significant inputs are unobservable, the Company's investment accounting vendor obtains valuations from pricing vendors or brokers using the market approach and income approach valuation techniques and are disclosed as Level 3.

Management performs several procedures to ascertain the reasonableness of investment values included in the consolidated financial statements at December 31, 2025 and 2024, including 1) obtaining and reviewing internal control reports from the Company's investment accounting vendor that assess fair values from third party pricing services, 2) discussing with the Company's investment accounting vendor its process for reviewing and validating pricing obtained from third party pricing services and 3) reviewing the security pricing received from the Company's investment accounting vendor and monitoring changes in unrealized gains and losses at the individual security level. The Company has evaluated the various types of securities in its investment portfolio to determine an appropriate fair value hierarchy level based upon trading activity and the observability of market inputs.

The following tables present the balances of assets measured at fair value on a recurring basis as of December 31, 2025 and 2024, by level within the fair value hierarchy:


	December 31, 2025
	Level 1		Level 2		Level 3		Total
	(in thousands)
Assets
Fixed maturities:
U.S. Treasury securities and obligations of U.S. government agencies	$	874	$	—	$	—	$	874
Obligations of states, municipalities and political subdivisions	—		127,860		—		127,860
Corporate and other securities	—		1,713,888		—		1,713,888
Asset-backed securities	—		588,519		—		588,519
Residential mortgage-backed securities	—		1,459,270		—		1,459,270
Commercial mortgage-backed securities	—		451,039		—		451,039
Total fixed maturities	874		4,340,576		—		4,341,450

Equity securities:
Exchange traded funds	185,523		—		—		185,523
Non-redeemable preferred stock	—		24,100		—		24,100
Common stocks	416,776		—		—		416,776
Total equity securities	602,299		24,100		—		626,399
Short-term investments	3,864		—		—		3,864
Total	$	607,037	$	4,364,676	$	—	$	4,971,713


	December 31, 2024
	Level 1		Level 2		Level 3		Total
	(in thousands)
Assets
Fixed maturities:
U.S. Treasury securities and obligations of U.S. government agencies	$	15,048	$	—	$	—	$	15,048
Obligations of states, municipalities and political subdivisions	—		146,304		—		146,304
Corporate and other securities	—		1,989,490		—		1,989,490
Asset-backed securities	—		732,742		—		732,742
Residential mortgage-backed securities	—		448,874		—		448,874
Commercial mortgage-backed securities	—		205,105		—		205,105
Total fixed maturities	15,048		3,522,515		—		3,537,563

Equity securities:
Exchange traded funds	129,731		—		—		129,731
Non-redeemable preferred stock	—		26,433		—		26,433
Common stocks	242,195		—		—		242,195
Total equity securities	371,926		26,433		—		398,359
Short-term investments	3,714		—		—		3,714
Total	$	390,688	$	3,548,948	$	—	$	3,939,636

There were no assets or liabilities measured at fair value on a nonrecurring basis as of December 31, 2025 or 2024.

The carrying amount of the Company's fixed-rate senior notes was $175.0 million, less debt issuance cost, and the corresponding estimated fair value was $173.8 million and $168.6 million at December 31, 2025 and 2024, respectively. The fair value measurement was determined using a discounted cash flow analysis that factors in current market yields for comparable borrowing arrangements under the Company's credit profile. Since this methodology is based upon market yields for comparable arrangements, the measurement is categorized as Level 2. The estimated fair value of outstanding borrowings under the Company's revolving Credit Facility approximated its carrying value at December 31, 2025 and 2024. See Note 11 for further information regarding the Company's debt arrangements.

The Company holds cash equivalents that are managed as part of its investment portfolio and, due to the short-term maturities of these assets, the carrying value of these investments approximates fair value. The Company held cash equivalents of $45.3 million and $16.1 million at December 31, 2025 and 2024, respectively.

- Definition

The entire disclosure for the fair value of financial instruments (as defined), including financial assets and financial liabilities (collectively, as defined), and the measurements of those instruments as well as disclosures related to the fair value of non-financial assets and liabilities. Such disclosures about the financial instruments, assets, and liabilities would include: (1) the fair value of the required items together with their carrying amounts (as appropriate); (2) for items for which it is not practicable to estimate fair value, disclosure would include: (a) information pertinent to estimating fair value (including, carrying amount, effective interest rate, and maturity, and (b) the reasons why it is not practicable to estimate fair value; (3) significant concentrations of credit risk including: (a) information about the activity, region, or economic characteristics identifying a concentration, (b) the maximum amount of loss the entity is exposed to based on the gross fair value of the related item, (c) policy for requiring collateral or other security and information as to accessing such collateral or security, and (d) the nature and brief description of such collateral or security; (4) quantitative information about market risks and how such risks are managed; (5) for items measured on both a recurring and nonrecurring basis information regarding the inputs used to develop the fair value measurement; and (6) for items presented in the financial statement for which fair value measurement is elected: (a) information necessary to understand the reasons for the election, (b) discussion of the effect of fair value changes on earnings, (c) a description of [similar groups] items for which the election is made and the relation thereof to the balance sheet, the aggregate carrying value of items included in the balance sheet that are not eligible for the election; (7) all other required (as defined) and desired information.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 820
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (bbb)(1)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482106/820-10-50-2

Reference 2: http://www.xbrl.org/2003/role/exampleRef
-Topic 820
-SubTopic 10
-Name Accounting Standards Codification
-Section 55
-Paragraph 107
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482078/820-10-55-107

Reference 3: http://www.xbrl.org/2003/role/exampleRef
-Topic 820
-SubTopic 10
-Name Accounting Standards Codification
-Section 55
-Paragraph 100
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482078/820-10-55-100

Reference 4: http://www.xbrl.org/2003/role/disclosureRef
-Topic 820
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (c)(3)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482106/820-10-50-2

Reference 5: http://www.xbrl.org/2003/role/disclosureRef
-Topic 820
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 6A
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482106/820-10-50-6A

Reference 6: http://www.xbrl.org/2003/role/disclosureRef
-Topic 820
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2E
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482106/820-10-50-2E

Reference 7: http://www.xbrl.org/2003/role/disclosureRef
-Topic 820
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 6A
-Subparagraph (h)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482106/820-10-50-6A

Reference 8: http://www.xbrl.org/2003/role/disclosureRef
-Topic 820
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 6A
-Subparagraph (f)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482106/820-10-50-6A

Reference 9: http://www.xbrl.org/2003/role/disclosureRef
-Topic 820
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 6A
-Subparagraph (e)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482106/820-10-50-6A

Reference 10: http://www.xbrl.org/2003/role/disclosureRef
-Topic 820
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 6A
-Subparagraph (d)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482106/820-10-50-6A

Reference 11: http://www.xbrl.org/2003/role/disclosureRef
-Topic 820
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (h)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482106/820-10-50-2

Reference 12: http://www.xbrl.org/2003/role/disclosureRef
-Topic 820
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (g)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482106/820-10-50-2

Reference 13: http://www.xbrl.org/2003/role/disclosureRef
-Topic 940
-SubTopic 820
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147478119/940-820-50-1

+ Details

Deferred policy acquisition costs

12 Months Ended

Dec. 31, 2025

Deferred Policy Acquisition Costs Disclosures [Abstract]

Deferred policy acquisition costs

The following table presents the amounts of policy acquisition costs deferred and amortized for the years ended:


	Year Ended December 31,
	2025		2024		2023
	(in thousands)
Balance, beginning of year	$	109,263	$	88,395	$	61,594
Policy acquisition costs deferred:
Direct commissions	291,851		274,124		227,755
Ceding commissions	(116,592)		(120,459)		(88,449)
Other underwriting and policy acquisition costs	16,805		14,215		10,982
Policy acquisition costs deferred	192,064		167,880		150,288
Amortization of net policy acquisition costs	(182,590)		(147,012)		(123,487)
Balance, end of year	$	118,737	$	109,263	$	88,395

Amortization of net policy acquisition costs is included in underwriting, acquisition and insurance expense in the accompanying consolidated statements of income and comprehensive income.

Underwriting, acquisition and insurance expenses

12 Months Ended

Dec. 31, 2025

Underwriting, Acquisition and Insurance Expenses [Abstract]

Underwriting, acquisition and insurance expenses

Underwriting, acquisition and insurance expenses consist of the following:


	Year Ended December 31,
	2025		2024		2023
	(in thousands)
Underwriting, acquisition and insurance expenses incurred:
Direct commissions	$	286,268	$	254,523	$	198,715
Ceding commissions	(119,466)		(120,339)		(84,998)
Other underwriting expenses	169,894		151,624		115,253
Total	$	336,696	$	285,808	$	228,970

Other underwriting expenses within underwriting, acquisition and insurance expenses included salaries, employee benefits and bonus expense of $128.9 million, $109.3 million and $85.7 million, for the years ended December 31, 2025, 2024 and 2023, respectively.

Income taxes

12 Months Ended

Dec. 31, 2025

Income Tax Disclosure [Abstract]

Income taxes

The Company’s subsidiaries file a consolidated U.S. federal income tax return. Under a tax sharing agreement, Kinsale collects from or refunds to its subsidiaries the amount of taxes determined as if Kinsale and the subsidiaries filed separate returns. The Company is no longer subject to income tax examination by tax authorities for the years ended before January 1, 2022. The Company’s insurance subsidiary, Kinsale Insurance, is not subject to state income taxes in the states in which it operates and is instead subject to premium taxes. The Company’s non-insurance subsidiaries are subject to state income taxes; however, they have generated state net operating loss carryforwards, for which a full valuation allowance is established.

On July 4, 2025, the One Big Beautiful Bill Act ("OBBBA") was enacted into law. The OBBBA extends or makes permanent various tax provisions that were originally enacted in the 2017 Tax Cuts and Jobs Act and were set to expire at the end of 2025. The tax provisions in the OBBBA did not have a material impact on the Company's consolidated financial statements.

Components of Income Tax Expense

The Company operates exclusively within the United States and, as such, has no foreign operations or foreign income. For the years ending December 31, 2025, 2024 and 2023, income before income tax expense includes the following components:


	Year Ended December 31,
	2025		2024		2023
	(in thousands)
Income from continuing operations before income tax expense
U.S.	$	634,302	$	514,716	$	384,017

Total	$	634,302	$	514,716	$	384,017

For the years ending December 31, 2025, 2024 and 2023, income tax expense (benefit) from continuing operations consisted of:


	Year Ended December 31,
	2025		2024		2023
	(in thousands)
Income tax expense (benefit) from continuing operations
Current tax expense
U.S. federal	$	130,345	$	103,701	$	85,353
U.S. state and local	—		—		—

Total current tax expense	130,345		103,701		85,353

Deferred tax expense (benefit)
U.S. federal	343		(3,828)		(9,429)
U.S. state and local	—		—		—

Total deferred tax expense (benefit)	343		(3,828)		(9,429)





Total income tax expense	$	130,688	$	99,873	$	75,924

Income taxes paid

The Company paid total income taxes (net of refunds received) of $129.6 million, $104.1 million, and $84.6 million for the years ending December 31, 2025, 2024 and 2023, respectively, all of which related to federal income taxes.

Current income taxes payable were $3.6 million and $2.8 million at December 31, 2025 and 2024, respectively, and are included in other liabilities in the accompanying consolidated balance sheets.

Rate reconciliation

The prevailing federal income tax rate was 21% for the years ending December 31, 2025, 2024 and 2023. The reconciliation of the statutory U.S. federal income tax rate to the Company’s effective tax rate for the years ending December 31, 2025, 2024 and 2023 is as follows:


	Year Ended December 31,
	2025				2024				2023
	(in thousands)
	Amount		Percent		Amount		Percent		Amount		Percent
U.S. federal statutory income tax rate	$	133,203	21.0	%	$	108,090	21.0	%	$	80,644	21.0	%

U.S. federal
Tax credits	(500)		(0.1)	%	—		—	%	—		—	%
Nontaxable and nondeductible items	2,885		0.5	%	1,902		0.4	%	212		0.1	%


Excess tax benefits on share-based payments	(4,900)		(0.8)	%	(10,119)		(2.0)	%	(4,932)		(1.3)	%





Total	$	130,688	20.6	%	$	99,873	19.4	%	$	75,924	19.8	%

The Company's effective tax rate for the years ended December 31, 2025, 2024 and 2023, were 20.6%, 19.4% and 19.8% compared to the statutory federal rate of 21%. The difference primarily resulted from tax benefits from stock-based compensation, including stock options exercised, and from income generated by certain tax-exempt investments.

The significant components of the net deferred tax asset are summarized as follows:


	December 31,
	2025		2024
	(in thousands)
Deferred tax assets:
Unrealized losses on fixed-maturity securities	$	8,662	$	26,343
Unpaid losses and loss adjustment expenses	49,288		36,491
Unearned premiums	34,267		32,580
State operating loss carryforwards	10,216		8,859
Stock compensation	3,158		3,276
Allowance for credit losses	5,742		5,210
Other	2,145		1,939
Deferred tax assets before allowance	113,478		114,698
Less: valuation allowance	(10,119)		(9,066)
Total deferred tax assets	103,359		105,632

Deferred tax liabilities:

Unrealized gains on equity securities	30,129		17,774
Deferred policy acquisition costs, net of ceding commissions	24,935		22,945
Property and equipment	4,894		3,263


Other	1,210		1,435
Total deferred tax liabilities	61,168		45,417
Net deferred tax asset	$	42,191	$	60,215

At December 31, 2025 and 2024, the Company had state net operating losses ("NOLs") of $215.5 million and $186.9 million, respectively. The state NOLs are available to offset future taxable income or reduce taxes payable and begin expiring in 2029.

Management evaluates the need for a valuation allowance related to its deferred tax assets. At December 31, 2025 and 2024, the Company recorded a tax valuation allowance equal to the state NOLs and the deferred tax assets, net of existing deferred tax liabilities that were expected to reverse in future periods, related to certain state jurisdictions. No other valuation allowances were established against the Company’s deferred tax assets at December 31, 2025 and 2024, as the Company believes that it is more likely than not that the remaining deferred tax assets will be realized given the carry back availability, reversal of existing temporary differences and future taxable income. With respect to deferred tax assets associated with unrealized losses on fixed-maturity securities, management has the ability and intent to execute a tax planning strategy to hold those securities to recovery or maturity to the extent not matched with realized capital gains or available carry back to ensure recognition of the deferred tax asset. After consideration of all available evidence, we concluded that it is more likely than not that these deferred tax assets will be realized.

The Company did not have any material uncertain tax positions in 2025 or 2024. Management is not aware of any events that would give rise to any material uncertain tax positions.

- Definition

The entire disclosure for income tax.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 942
-SubTopic 740
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147477617/942-740-50-1

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 235
-SubTopic 10
-Name Accounting Standards Codification
-Section S50
-Paragraph 1
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480738/235-10-S50-1

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Topic 944
-SubTopic 740
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147478822/944-740-50-1

Reference 4: http://www.xbrl.org/2003/role/disclosureRef
-Topic 740
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 12
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482685/740-10-50-12

Reference 5: http://www.xbrl.org/2003/role/exampleRef
-Topic 740
-SubTopic 10
-Name Accounting Standards Codification
-Section 55
-Paragraph 231
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482663/740-10-55-231

Reference 6: http://www.xbrl.org/2003/role/disclosureRef
-Topic 740
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 12C
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482685/740-10-50-12C

Reference 7: http://www.xbrl.org/2003/role/disclosureRef
-Topic 740
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 12B
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482685/740-10-50-12B

Reference 8: http://www.xbrl.org/2003/role/disclosureRef
-Topic 740
-SubTopic 270
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147477891/740-270-50-1

Reference 9: http://www.xbrl.org/2003/role/disclosureRef
-Topic 740
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SAB Topic 6.I.5.Q1)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479360/740-10-S99-1

Reference 10: http://www.xbrl.org/2003/role/disclosureRef
-Topic 946
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 13
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480990/946-20-50-13

Reference 11: http://www.xbrl.org/2003/role/disclosureRef
-Topic 235
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.4-08(h)(2))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480678/235-10-S99-1

Reference 12: http://www.xbrl.org/2003/role/disclosureRef
-Topic 740
-Name Accounting Standards Codification
-Publisher FASB
-URI https://asc.fasb.org/740/tableOfContent

Reference 13: http://www.xbrl.org/2003/role/disclosureRef
-Topic 740
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 14
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482685/740-10-50-14

Reference 14: http://www.xbrl.org/2003/role/disclosureRef
-Topic 740
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 21
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482685/740-10-50-21

Reference 15: http://www.xbrl.org/2003/role/disclosureRef
-Topic 740
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 17
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482685/740-10-50-17

Reference 16: http://www.xbrl.org/2003/role/disclosureRef
-Topic 740
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 2
-Subparagraph (SAB Topic 11.C)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479360/740-10-S99-2

Reference 17: http://www.xbrl.org/2003/role/disclosureRef
-Topic 740
-SubTopic 30
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482603/740-30-50-2

+ Details

Reserves for unpaid losses and loss adjustment expenses

12 Months Ended

Dec. 31, 2025

Liability for Unpaid Claims and Claims Adjustment Expense, Activity in Liability [Abstract]

Reserves for unpaid losses and loss adjustment expenses

The reserves for unpaid losses and loss adjustment expenses represent the Company's estimated ultimate cost of all unreported and reported but unpaid insured claims and the cost to adjust these claims. Reserves are estimated using individual case-basis valuations of reported claims and statistical analyses. Case reserves are established for individual claims that have been reported to the Company, typically by the Company's insureds or their brokers. Based on the information provided, case reserves are established by estimating the ultimate losses from the claim, including defense costs associated with the ultimate settlement of the claim. Incurred-but-not-reported ("IBNR") reserves are determined using actuarial methods to estimate losses that have occurred but have not yet been reported to the Company. Various actuarial methods are used to arrive at the Company's loss reserve estimates for each line of business. These methods utilize numerous inputs including initial expected loss ratios, loss development patterns, paid losses, reported losses, claim counts and price indices. The Company also uses industry and peer-group data, in addition to its own data, to assist in analyzing loss development patterns by line of business.

As part of the reserving process, the Company reviews historical data and considers the effect of various factors on claims development patterns including polices written on a "claims made" versus "occurrence" basis. Policies written on a claims made basis provide coverage to the insured only for losses incurred during the coverage period, and only if the claim was reported during a specified reporting period. Policies written on an occurrence basis provide coverage to the insured for liabilities arising from events occurring during the term of the policy, regardless of when a claim is actually made. Accordingly, claims related to policies written on an occurrence basis may arise many years after a policy has lapsed. Property losses, while written on an occurrence basis, are generally reported within a short time from the date of loss, and in most instances, property claims are settled and paid within a relatively short period of time.

The following table presents a reconciliation of consolidated beginning and ending reserves for unpaid losses and loss adjustment expenses:


	December 31,
	2025		2024		2023
	(in thousands)
Gross reserves for unpaid losses and loss adjustment expenses, beginning of year	$	2,285,668	$	1,692,875	$	1,238,402
Less: reinsurance recoverable on unpaid losses	323,060		241,357		177,039

Net reserves for unpaid losses and loss adjustment expenses, beginning of year	1,962,608		1,451,518		1,061,363
Incurred losses and loss adjustment expenses:
Current year	953,510		810,554		635,993
Prior years	(62,817)		(37,655)		(35,774)
Total net losses and loss adjustment expenses incurred	890,693		772,899		600,219
Payments:
Current year	64,288		49,747		38,565
Prior years	279,499		212,062		171,499
Total payments	343,787		261,809		210,064
Net reserves for unpaid losses and loss adjustment expenses, end of year	2,509,514		1,962,608		1,451,518
Reinsurance recoverable on unpaid losses, net of allowance	381,356		323,060		241,357
Gross reserves for unpaid losses and loss adjustment expenses, end of year	$	2,890,870	$	2,285,668	$	1,692,875

During the year ended December 31, 2025, prior accident years developed favorably by $62.8 million, of which $70.9 million was attributable to the 2020 through 2024 accident years due to lower emergence of reported losses than expected across most lines of business, particularly in the property lines of business. This favorable development was offset in part by adverse development primarily in the construction liability business in the 2016 through 2019 accident years and adjustments to actuarial assumptions in the 2020 through 2024 accident years to reflect inflation uncertainty around construction defect exposures.

Current accident year incurred losses and loss adjustment expenses for the year ended December 31, 2025 included $30.4 million of net catastrophe losses primarily related to the Palisades Fire.

During the year ended December 31, 2024, prior accident years developed favorably by $37.7 million, of which $57.6 million was attributable to the 2021 through 2023 accident years due to lower emergence of reported losses than expected across most lines of business. This favorable development was offset in part by adverse development primarily from the 2017 through 2019 accident years due to construction defect claims that are more exposed to inflation, from the 2020 accident year due to a large property claim and more conservative actuarial assumptions in the 2021 through 2023 accident years for lines of business exposed to construction liability.

Current accident year incurred losses and loss adjustment expenses for the year ended December 31, 2024 included $25.5 million of net catastrophe losses primarily related to Hurricanes Milton, Helene and Francine and tornadoes in the Midwest.

During the year ended December 31, 2023, prior accident years developed favorably by $35.8 million, of which $49.0 million was attributable to the 2021 and 2022 accident years due to lower emergence of reported losses than expected across most lines of business. This favorable development was offset in part by adverse development largely from the 2017 and 2019 accident years due to construction defect claims that are more exposed to inflation.

Incurred and Paid Claims Development

The following is information about incurred and paid claims development as of December 31, 2025, net of reinsurance, as well as cumulative claim frequency and the total of IBNR liabilities plus expected development on reported claims included within the net incurred claims amounts. The development and claims duration tables below exclude commuted multi-line quota-share reinsurance treaty ("MLQS") contracts, which would distort development patterns related to those transactions. Cumulative number of reported claims is reported on a per claim basis.

The information about incurred and paid claims development for the years ended December 31, 2016 to December 31, 2024 is presented as unaudited supplementary information.

Property


	Incurred Claims and Claim Adjustment Expenses, Net of Reinsurance
	For the Years Ended December 31,										December 31, 2025
Accident Year	2021 Unaudited		2022 Unaudited		2023 Unaudited		2024 Unaudited		2025		Total of IBNR Liabilities Plus Expected Development on Reported Claims		Cumulative Number of Reported Claims
	($ in thousands)
2021	$	36,531	$	33,518	$	29,750	$	31,392	$	30,340	$	—	1,148
2022			67,127		53,676		53,527		52,311		2,917		2,349
2023					75,517		54,503		43,569		12,150		999
2024							112,051		83,016		26,458		1,483
2025									129,580		75,567		917
							Total		$	338,816


	Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance
	For the Years Ended December 31,
Accident Year	2021 Unaudited		2022 Unaudited		2023 Unaudited		2024 Unaudited		2025
	($ in thousands)
2021	$	14,268	$	21,257	$	27,324	$	30,200	$	30,332
2022			33,004		46,965		48,030		48,784
2023					20,267		26,434		28,734
2024							31,303		46,611
2025									42,491
							Total		196,952
			All outstanding liabilities before 2021, net of reinsurance						505
			Liabilities for claims and claim adjustment expenses, net of reinsurance						$	142,369

Historical Claims Duration

The following is supplementary information about average historical claims duration as of December 31, 2025:


Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance
	(Unaudited)
Years	1		2		3		4		5
Property	45.4	%	20.6	%	9.1	%	5.5	%	0.4	%

Casualty - Claims Made


	Incurred Claims and Claim Adjustment Expenses, Net of Reinsurance
	For the Years Ended December 31,																				December 31, 2025
Accident Year	2016 Unaudited		2017 Unaudited		2018 Unaudited		2019 Unaudited		2020 Unaudited		2021 Unaudited		2022 Unaudited		2023 Unaudited		2024 Unaudited		2025		Total of IBNR Liabilities Plus Expected Development on Reported Claims		Cumulative Number of Reported Claims
	($ in thousands)
2016	$	19,170	$	14,693	$	14,675	$	14,322	$	13,583	$	13,602	$	13,228	$	12,707	$	12,703	$	12,701	$	10	314
2017			18,116		17,097		16,120		15,794		14,989		13,698		13,471		12,840		12,836		35		372
2018					22,429		20,234		18,612		17,057		14,411		14,272		14,186		14,789		562		467
2019							34,693		29,056		26,426		24,489		21,788		22,839		22,615		1,314		567
2020									55,630		44,641		38,287		33,667		28,877		26,257		2,689		789
2021											84,018		66,191		52,935		36,710		32,389		11,658		1,091
2022													101,064		81,394		60,873		56,758		21,721		1,251
2023															115,858		91,516		83,123		43,710		1,498
2024																	123,511		113,003		76,532		1,610
2025																			140,071		122,573		1,629
																	Total		$	514,542


	Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance
	For the Years Ended December 31,
Accident Year	2016 Unaudited		2017 Unaudited		2018 Unaudited		2019 Unaudited		2020 Unaudited		2021 Unaudited		2022 Unaudited		2023 Unaudited		2024 Unaudited		2025
	($ in thousands)
2016	$	1,158	$	3,015	$	6,907	$	9,839	$	11,381	$	12,105	$	12,299	$	12,691	$	12,691	$	12,691
2017			340		4,897		8,252		10,484		11,357		12,235		12,335		12,779		12,792
2018					507		5,030		8,931		10,330		11,205		12,623		13,247		13,329
2019							2,487		6,005		10,123		14,476		15,406		16,598		19,010
2020									1,002		7,446		12,551		18,589		22,445		23,356
2021											1,146		8,437		12,895		16,294		19,634
2022													3,052		12,381		24,033		28,758
2023															4,830		16,895		31,206
2024																	6,755		23,330
2025																			4,864
																	Total		188,970
	All outstanding liabilities before 2016, net of reinsurance																		21
	Liabilities for claims and claim adjustment expenses, net of reinsurance																		$	325,593

Casualty - Occurrence


	Incurred Claims and Claim Adjustment Expenses, Net of Reinsurance
	For the Years Ended December 31,																				December 31, 2025
Accident Year	2016 Unaudited		2017 Unaudited		2018 Unaudited		2019 Unaudited		2020 Unaudited		2021 Unaudited		2022 Unaudited		2023 Unaudited		2024 Unaudited		2025		Total of IBNR Liabilities Plus Expected Development on Reported Claims		Cumulative Number of Reported Claims
	($ in thousands)
2016	$	61,440	$	55,680	$	53,549	$	55,534	$	57,401	$	60,861	$	64,612	$	65,323	$	65,025	$	65,469	$	4,441	1,715
2017			71,126		67,151		68,985		70,641		71,117		69,911		76,715		79,203		81,696		7,158		2,344
2018					86,157		78,331		78,386		83,952		93,215		97,005		101,939		103,208		10,494		2,710
2019							112,266		109,994		108,138		107,480		115,681		120,003		124,190		19,181		2,708
2020									154,619		136,212		131,082		135,045		140,203		142,565		53,064		3,451
2021											200,598		190,879		193,722		204,787		206,475		105,695		3,542
2022													272,692		271,399		287,977		292,377		162,331		4,350
2023															372,245		372,413		379,978		279,930		4,792
2024																	490,719		489,026		430,927		4,329
2025																			581,722		559,623		2,959
																	Total		$	2,466,706


	Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance
	For the Years Ended December 31,
Accident Year	2016 Unaudited		2017 Unaudited		2018 Unaudited		2019 Unaudited		2020 Unaudited		2021 Unaudited		2022 Unaudited		2023 Unaudited		2024 Unaudited		2025
	($ in thousands)
2016	$	1,099	$	6,015	$	17,225	$	28,924	$	34,437	$	43,311	$	51,533	$	55,595	$	57,421	$	60,165
2017			1,581		9,352		22,407		37,736		46,025		52,069		61,108		66,435		70,258
2018					2,638		10,995		22,860		35,138		54,441		72,174		82,927		88,652
2019							3,944		16,687		30,518		46,478		69,384		84,496		98,239
2020									2,400		8,673		17,805		32,606		55,548		78,929
2021											3,205		12,944		31,494		57,465		84,691
2022													4,658		23,084		56,201		103,263
2023															4,329		21,930		65,628
2024																	6,032		31,578
2025																			5,078
																	Total		686,481
					All outstanding liabilities before 2016, net of reinsurance														9,093
			Liabilities for claims and claim adjustment expenses, net of reinsurance																$	1,789,318

Historical Claims Duration

The following is supplementary information about average historical claims duration as of December 31, 2025:


	Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance
	(Unaudited)
Years	1		2		3		4		5		6		7		8		9		10
Casualty - claims made	5.4	%	21.0	%	21.5	%	15.9	%	9.0	%	6.2	%	4.3	%	2.4	%	0.1	%	—	%
Casualty - occurrence	1.7	%	6.7	%	11.7	%	14.3	%	14.2	%	13.3	%	11.3	%	6.1	%	3.7	%	4.2	%

Reconciliation of Incurred and Paid Claims Development to the Liability for Unpaid Claims and Claim Adjustment Expenses

The reconciliation of the net incurred and paid claims development tables to the liability for unpaid claims and claim adjustment expenses in the consolidated statement of financial position is as follows:


(in thousands)	December 31, 2025
Net outstanding liabilities
Property	$	142,369
Casualty - claims made	325,593
Casualty - occurrence	1,789,318
Liabilities for unpaid claims and claim adjustment expenses, net of reinsurance	2,257,280

Reinsurance recoverable on unpaid claims
Property	112,836
Casualty - claims made	22,702
Casualty - occurrence	246,890
Allowance for credit losses	(1,072)
Total reinsurance recoverable on unpaid claims	381,356
Unallocated claims adjustment expenses	251,162
Allowance for credit losses	1,072
Gross liability for unpaid claims and claim adjustment expense	$	2,890,870

Reinsurance

12 Months Ended

Dec. 31, 2025

Reinsurance Disclosures [Abstract]

Reinsurance

The Company purchases reinsurance from other insurance companies ("reinsurers") in order to limit its exposure to large losses and enable it to underwrite policies with sufficient limits to meet policyholder needs. In a reinsurance transaction, an insurance company transfers, or cedes, part or all of its exposure to the reinsurer that receives a portion of the premium. The ceding of insurance does not legally discharge the Company from its primary liability for the full amount of the policy coverage, and therefore the Company will be required to pay the loss and bear collection risk if the reinsurer fails to meet its obligations under the reinsurance agreement.

The following table summarizes the effect of reinsurance on premiums written and earned:


	Year Ended December 31,
	2025		2024		2023
	(in thousands)
Written:
Direct	$	1,977,171	$	1,870,341	$	1,568,815

Ceded	(361,154)		(392,993)		(304,185)
Net written	$	1,616,017	$	1,477,348	$	1,264,630

Earned:
Direct	$	1,945,225	$	1,743,243	$	1,367,141

Ceded	(369,383)		(392,773)		(294,604)
Net earned	$	1,575,842	$	1,350,470	$	1,072,537

Incurred losses and loss adjustment expenses were net of reinsurance recoverables (ceded incurred losses and loss adjustment expenses) of $121.9 million, $125.4 million and $115.9 million for the years ended December 31, 2025, 2024 and 2023, respectively.

Reinsurance balances

The following table presents reinsurance recoverables on paid and unpaid losses as of December 31, 2025 and 2024:


	December 31, 2025		December 31, 2024
	(in thousands)
Reinsurance recoverables on paid losses	$	12,973	$	14,831
Reinsurance recoverables on unpaid losses	381,356		323,060
Reinsurance recoverables	$	394,329	$	337,891

Credit risk exists with reinsurance ceded to the extent that any reinsurer is unable to meet the obligations assumed under the reinsurance agreements. Allowances are established for amounts deemed uncollectible. The Company evaluates the financial condition of its reinsurers and monitors concentration of credit risk arising from its exposure to individual reinsurers. All reinsurance recoverables are from companies with A.M. Best ratings of "A-" (Excellent) or better. To further reduce credit exposure to reinsurance recoverable balances, the Company has received letters of credit from certain reinsurers that are not authorized as reinsurers under U.S. state insurance regulations. The Company recorded an allowance for credit losses of $1.1 million and $0.9 million related to its reinsurance balances at December 31, 2025 and 2024, respectively; however, the deterioration in the credit quality of existing reinsurers or disputes over reinsurance agreements could result in future charges.

At December 31, 2025, reinsurance recoverables on paid and unpaid losses from the Company’s five largest reinsurers were $95.8 million, $46.3 million, $37.9 million, $30.8 million and $24.6 million, representing 59.7% of the total balance.

At December 31, 2025, unearned premiums ceded to five reinsurers were $9.8 million, $5.3 million, $4.7 million, $4.5 million and $4.0 million representing 63.7% of the total balance.

Stockholders' Equity

12 Months Ended

Dec. 31, 2025

Equity, Attributable to Parent [Abstract]

Stockholders' equity

Stockholders’ equity

Capital Stock

The Company’s authorized capital stock consists of 400,000,000 shares of common stock, par value $0.01 per share, and 100,000,000 shares of preferred stock, par value $0.01 per share. There were no shares of preferred stock issued or outstanding at December 31, 2025 or 2024.

Treasury Stock

In October 2024, the Company's Board of Directors authorized a share repurchase program authorizing the repurchase of up to $100.0 million of the Company's common stock. This share repurchase program was exhausted in October 2025.

In December 2025, the Company's Board of Directors authorized a new share repurchase program authorizing the repurchase of up to $250.0 million of the Company's common stock. The shares may be repurchased from time to time in open market purchases, privately-negotiated transactions, block purchases, accelerated share repurchase agreements or a combination of methods and pursuant to safe harbors provided by Rule 10b-18 and Rule 10b5-1 under the Securities Exchange Act of 1934. The timing, manner, price and amount of any repurchases under the share repurchase program will be determined by the Company in its discretion. The stock repurchase program does not require the Company to repurchase any specific number of shares, and may be modified, suspended or terminated at any time.

The cost of treasury stock acquired pursuant to common share repurchases includes the 1% excise tax imposed on common share repurchase activity, net of common share issuances, as part of the Inflation Reduction Act of 2022. The Company recorded excise taxes payable of $0.6 million for the year ended December 31, 2025. There were no excise taxes imposed for the year ended December 31, 2024.

Equity-based Compensation

The Kinsale Capital Group, Inc. 2016 Omnibus Incentive Plan (the "2016 Incentive Plan") was effective from 2016 to 2025. On May 22, 2025, the Company's stockholders approved the Kinsale Capital Group, Inc. 2025 Omnibus Incentive Plan (the "2025 Incentive Plan"), which replaced the 2016 Incentive Plan prior to its scheduled expiration in 2026. The 2025 Incentive Plan is administered by the Compensation, Nominating and Corporate Governance Committee of the Company's Board of Directors and authorizes the grant of stock options, restricted stock, restricted stock units, and other stock-based awards to officers, employees, directors, independent contractors, and consultants.

No additional awards will be issued under the 2016 Incentive Plan, and shares remaining available under that plan will not roll forward to the 2025 Incentive Plan. The maximum number of shares of the Company's common stock reserved and available for issuance under the 2025 Incentive Plan is 860,500 plus any shares subject to awards outstanding under the 2016 Incentive Plan as of May 22, 2025 that are subsequently forfeited or settled in cash. There were no shares granted under the 2025 Incentive Plan during the year ended December 31, 2025.

The Company recognized total equity-based compensation expense of $17.9 million, $14.1 million and $9.4 million for the years ended December 31, 2025, 2024 and 2023, respectively.

Stock Options

On July 27, 2016, the Board of Directors approved, and the Company granted, 1,036,916 stock options with an exercise price equal to the initial public offering price of $16.00 per share. The options have a maximum contractual term of 10 years and vested in 4 equal annual installments following the date of the grant. The weighted average grant date fair value of options granted during 2016 was $2.71 per share. The value of the options granted was estimated at the date of grant using the Black-Scholes pricing model.

A summary of option activity as of December 31, 2025 and changes during the year then ended is presented below:


	Number of Shares	Weighted-average exercise price		Weighted-average remaining years of contractual life	Aggregate intrinsic value (in thousands)
Outstanding at December 31, 2024	118,468	$	16.00
Granted	—	—
Forfeited	—	—
Exercised	(42,554)	16.00
Outstanding at December 31, 2025	75,914	$	16.00	0.6	$	28,477
Exercisable at December 31, 2025	75,914	$	16.00	0.6	$	28,477

The total intrinsic value of options exercised was $18.7 million during the year ended December 31, 2025 and $38.2 million during the year ended December 31, 2024.

Restricted Stock Awards

During 2025, the Board of Directors approved, and the Company granted, restricted stock awards under the 2016 Incentive Plan. The restricted stock awards were valued on the date of grant and will vest over a period of 1 to 4 years corresponding to the anniversary date of the grants. The fair value of restricted stock awards was determined based on the closing trading price of the Company’s common stock on the grant date or, if no common stock was traded on the grant date, the last preceding date for which there was a sale of common stock. Except for restrictions placed on the transferability of restricted stock, holders of unvested restricted stock have full stockholder’s rights, including voting rights and the right to receive cash dividends. Unvested restricted stock awards and accrued dividends, if any, are forfeited upon the termination of service to or employment with the Company.

A summary of restricted stock activity under the equity compensation plans for the year ended is as follows:


	December 31, 2025
	Number of Shares	Weighted Average Grant Date Fair Value per Share
Nonvested outstanding at the beginning of the period	110,123	$	366.73
Granted	59,963	$	433.62
Vested	(43,685)	$	322.04
Forfeited	(2,351)	$	390.17
Nonvested outstanding at the end of the period	124,050	$	414.36

Employees surrender restricted stock awards to pay for withholding tax obligations resulting from any vesting of those awards. During the year ended December 31, 2025, restricted stock awards withheld for taxes in connection with the vesting of those awards totaled 14,536.

The per share weighted average grant-date fair value of the Company's restricted stock awards granted during the years ended December 31, 2025, 2024 and 2023 was $433.62, $502.43 and $313.35, respectively. The fair value of restricted stock awards that vested during the year ended December 31, 2025, 2024 and 2023 was $19.0 million, $20.0 million and $12.8 million, respectively. As of December 31, 2025, the Company had $35.5 million of total unrecognized stock-based compensation expense expected to be charged to earnings over a weighted-average period of 2.2 years.

Subsequent Events

The Board of Directors granted 4,140 restricted stock awards on January 1, 2026 under the 2025 Incentive Plan to the Company’s directors. The restricted stock awards had a fair value on the date of grant of $391.12 per share and will vest on the first anniversary date of the grant.

On February 4, 2026, the Company’s Board of Directors declared a cash dividend of $0.25 per share of common stock. This dividend is payable on March 12, 2026 to all stockholders of record on February 26, 2026.

- Definition

The entire disclosure for equity.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 815
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 8A
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480434/815-10-50-8A

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 505
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-Name Accounting Standards Codification
-Section 50
-Paragraph 13
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481112/505-10-50-13

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Topic 505
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-Paragraph 13
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Reference 4: http://www.xbrl.org/2003/role/disclosureRef
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-Paragraph 14
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481112/505-10-50-14

Reference 5: http://www.xbrl.org/2003/role/disclosureRef
-Topic 946
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-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147477968/946-235-50-2

Reference 6: http://www.xbrl.org/2003/role/disclosureRef
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-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (d)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147477968/946-235-50-2

Reference 7: http://www.xbrl.org/2003/role/disclosureRef
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-Name Accounting Standards Codification
-Section 50
-Paragraph 6
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147478448/946-505-50-6

Reference 8: http://www.xbrl.org/2003/role/disclosureRef
-Topic 815
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-Name Accounting Standards Codification
-Section 50
-Paragraph 6
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480237/815-40-50-6

Reference 9: http://www.xbrl.org/2003/role/disclosureRef
-Topic 505
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-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.3-04)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480008/505-10-S99-1

Reference 10: http://fasb.org/us-gaap/role/ref/legacyRef
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-Name Accounting Standards Codification
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-URI https://asc.fasb.org/505/tableOfContent

Reference 11: http://www.xbrl.org/2003/role/disclosureRef
-Topic 505
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Reference 12: http://www.xbrl.org/2003/role/disclosureRef
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Reference 13: http://www.xbrl.org/2003/role/disclosureRef
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-URI https://asc.fasb.org/1943274/2147481112/505-10-50-13

Reference 14: http://www.xbrl.org/2003/role/disclosureRef
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Reference 15: http://www.xbrl.org/2003/role/disclosureRef
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Reference 16: http://www.xbrl.org/2003/role/disclosureRef
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-Topic 505
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Reference 18: http://www.xbrl.org/2003/role/disclosureRef
-Topic 505
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Reference 19: http://www.xbrl.org/2003/role/disclosureRef
-Topic 505
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-Publisher FASB
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+ Details

Earnings per share

12 Months Ended

Dec. 31, 2025

Earnings Per Share [Abstract]

Earnings per share

The following table represents a reconciliation of the numerator and denominator of the basic and diluted earnings per share computations contained in the consolidated financial statements:


	Year ended December 31,
	2025		2024		2023
	(in thousands, except per share data)
Net income	$	503,614	$	414,843	$	308,093

Weighted average common shares outstanding - basic	23,140		23,153		23,045
Dilutive effect of shares issued under stock compensation arrangements:
Stock options	89		136		214
Restricted stock awards	30		43		48
Total dilutive effect of shares issued under stock compensation arrangements	119		179		262
Weighted average common shares outstanding - diluted	23,259		23,332		23,307

Earnings per common share:
Basic	$	21.76	$	17.92	$	13.37
Diluted	$	21.65	$	17.78	$	13.22

There were 56,000, 43,000 and 1,000 anti-dilutive stock awards for the years ended December 31, 2025, 2024 and 2023.

Basic earnings per share was computed by dividing the earnings attributable to the common stockholders by the weighted average number of shares of common stock outstanding during the period. Diluted earnings per share was computed by dividing earnings attributable to common stockholders by the weighted average number of shares of common stock outstanding during the period, including potentially dilutive shares of common stock for the period determined using the treasury stock method.

Debt

12 Months Ended

Dec. 31, 2025

Debt Disclosure [Abstract]

Debt Disclosure

Debt

Note Purchase and Private Shelf Agreement

On July 22, 2022, the Company entered into a Note Purchase and Private Shelf Agreement (as subsequently amended, the "Note Purchase Agreement") with PGIM, Inc. ("Prudential") and the purchasers of the Series A and Series B Senior Notes (as defined below). The Note Purchase Agreement provides for issuance of senior promissory notes with an aggregate principal amount of up to $200.0 million through September 18, 2026.

Pursuant to the Note Purchase Agreement, on July 22, 2022, the Company issued $125.0 million aggregate principal amount of 5.15% Series A Senior Notes Due July 22, 2034 (collectively, the "Series A Notes”), and on September 18, 2023, the Company issued a $50.0 million aggregate principal amount 6.21% Series B Senior Note ("Series B Note") due July 22, 2034.

The Series A and B Notes are senior unsecured obligations of the Company and rank pari passu with the Company’s Amended and Restated Credit Agreement.

Principal payments on the Series A Notes are required annually beginning on July 22, 2030 in equal installments of $25.0 million through July 22, 2034.

Principal payments on the Series B Note are required annually beginning on July 22, 2030 in equal installments of $10.0 million through July 22, 2034.

Credit Agreement

On July 22, 2022, the Company entered into an Amended and Restated Credit Agreement (as amended, the "Credit Agreement"), with JPMorgan Chase Bank, N.A., as administrative agent and as issuing bank, Truist Bank, as syndication agent, and the lenders party thereto (collectively, the "Lenders"). The Amended and Restated Credit Agreement provides the Company with a $100.0 million senior unsecured revolving credit facility (the "Credit Facility"), with the option to increase the aggregate commitment by $30.0 million. The Company is required to pay a Commitment Fee Rate (as defined therein) of 0.25% on the average daily amount of the Available Revolving Commitment (as defined therein). Borrowings under the Credit Agreement may be used for general corporate purposes (which may include, without limitation, to fund future growth, to finance working capital needs, to fund capital expenditures, and to refinance, redeem or repay indebtedness). During the year ended December 31, 2025, the Company drew down $40.0 million from the Credit Facility.

The loans under the Amended and Restated Credit Agreement bear interest, at the Company's option, at a rate equal to the Adjusted Term SOFR Rate (as defined therein) plus 1.625% or the Alternate Base Rate (as defined therein) plus 0.625%. For the year ended December 31, 2025, the annual weighted-average interest rate of borrowings under the Credit Facility was 5.83%.

The following table presents the Company's outstanding debt as of December 31, 2025 and 2024:



	Issuance	Maturities	December 31, 2025		December 31, 2024
			(in thousands)
Credit Facility	Various	7/22/2027	$	51,000	$	11,000
5.15% Series A Notes	7/22/2022	7/22/2034	125,000		125,000
6.21% Series B Note	9/18/2023	7/22/2034	50,000		50,000
Less: Unamortized debt issuance costs			(1,603)		(1,878)
Total debt			$	224,397	$	184,122

Interest paid under both agreements totaled $10.4 million, $10.3 million and $10.5 million for the years ended December 31, 2025, 2024 and 2023, respectively.

The following table summarizes the future principal payments on outstanding debt as of December 31, 2025:


Years Ending December 31,	Senior Notes		Credit Facility		Total
	(in thousands)
2026	$	—	$	—	$	—
2027	—		51,000		51,000
2028	—		—		—
2029	—		—		—
2030	35,000		—		35,000
2031 and thereafter	140,000		—		140,000
Total principal payments	$	175,000	$	51,000	$	226,000

Both the Note Purchase Agreement and the Amended and Restated Credit Agreement contain representations and affirmative and negative covenants, including financial covenants customary for agreements of this type, as well as customary events of default provisions. In December 2025, the covenants limiting restricted payments under the Note Purchase Agreement and Amended and Restated Credit Agreement were amended to allow the Company to make restricted payments so long as at the time of the declaration of such restricted payment, no event of default under the Note Purchase Agreement has occurred and is continuing or would arise after giving effect, on a pro forma basis, to such restricted payment if such restricted payment were to be made at such time of declaration.

As of December 31, 2025, the Company was in compliance with all of its financial covenants under both the Note Purchase Agreement and the Credit Facility.

- Definition

The entire disclosure for information about short-term and long-term debt arrangements, which includes amounts of borrowings under each line of credit, note payable, commercial paper issue, bonds indenture, debenture issue, own-share lending arrangements and any other contractual agreement to repay funds, and about the underlying arrangements, rationale for a classification as long-term, including repayment terms, interest rates, collateral provided, restrictions on use of assets and activities, whether or not in compliance with debt covenants, and other matters important to users of the financial statements, such as the effects of refinancing and noncompliance with debt covenants.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 815
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 8A
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480434/815-10-50-8A

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
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Reference 3: http://www.xbrl.org/2003/role/disclosureRef
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-URI https://asc.fasb.org/1943274/2147480678/235-10-S99-1

Reference 4: http://www.xbrl.org/2003/role/disclosureRef
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Reference 5: http://www.xbrl.org/2003/role/disclosureRef
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Reference 9: http://www.xbrl.org/2003/role/disclosureRef
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+ Details

Contingencies	12 Months Ended
Contingencies	Dec. 31, 2025
Commitments and Contingencies Disclosure [Abstract]
Contingencies	Contingencies Contingencies arise in the normal conduct of the Company’s operations and are not expected to have a material effect on the Company’s financial condition or results of operations. However, adverse outcomes are possible and could negatively affect the Company’s financial condition and results of operations. In June 2019, Marie Hughes, as authorized administrator for the estate of George Hughes, filed a wrongful death claim against Venetian Hills Apartments, LLC ("Venetian Hills") in DeKalb County in Georgia state court. On December 20, 2023, the jury awarded a verdict to the plaintiff of $140 million. On October 31, 2025, the Georgia Court of Appeals vacated the $140 million judgment and ordered a full retrial after it found that the trial court incorrectly charged the jury on the applicable law. On December 29, 2025, the plaintiff filed a petition requesting that the Georgia Supreme Court review the Georgia Court of Appeal’s decision. The Georgia Supreme Court has the discretion to either accept or deny the Plaintiff’s request to hear the case. Venetian Hills was a policyholder of a $1 million general liability policy issued by Kinsale Insurance. The Company believes exclusions in the policy apply to the claim and intends to defend any action related to this proceeding vigorously. The Company does not expect a resolution as to the Company’s liability, if any, with respect to this matter in the foreseeable future, and potentially for multiple years. The Company does not believe this legal proceeding will have a material adverse effect on its results of operations or business. The Company believes adequate provision has been made in its consolidated financial statements and its existing reserves account for liabilities to the Company relating to claims such as this legal proceeding.
Legal Matters and Contingencies	In June 2019, Marie Hughes, as authorized administrator for the estate of George Hughes, filed a wrongful death claim against Venetian Hills Apartments, LLC ("Venetian Hills") in DeKalb County in Georgia state court. On December 20, 2023, the jury awarded a verdict to the plaintiff of $140 million. On October 31, 2025, the Georgia Court of Appeals vacated the $140 million judgment and ordered a full retrial after it found that the trial court incorrectly charged the jury on the applicable law. On December 29, 2025, the plaintiff filed a petition requesting that the Georgia Supreme Court review the Georgia Court of Appeal’s decision. The Georgia Supreme Court has the discretion to either accept or deny the Plaintiff’s request to hear the case. Venetian Hills was a policyholder of a $1 million general liability policy issued by Kinsale Insurance. The Company believes exclusions in the policy apply to the claim and intends to defend any action related to this proceeding vigorously. The Company does not expect a resolution as to the Company’s liability, if any, with respect to this matter in the foreseeable future, and potentially for multiple years. The Company does not believe this legal proceeding will have a material adverse effect on its results of operations or business. The Company believes adequate provision has been made in its consolidated financial statements and its existing reserves account for liabilities to the Company relating to claims such as this legal proceeding.

Employee benefit plan	12 Months Ended
Employee benefit plan	Dec. 31, 2025
Retirement Benefits [Abstract]
Employee benefit plan	Employee benefit plan The Company has established a defined contribution employee retirement plan ("Plan") in accordance with Section 401(k) of the Internal Revenue Code. Expenses related to the Plan were $5.8 million, $5.0 million and $3.8 million in 2025, 2024 and 2023, respectively.

- Definition

The entire disclosure for retirement benefits.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 715
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Subparagraph (o)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480506/715-20-50-1

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
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Reference 3: http://www.xbrl.org/2003/role/disclosureRef
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-URI https://asc.fasb.org/1943274/2147480506/715-20-50-1

Reference 4: http://www.xbrl.org/2003/role/disclosureRef
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-Paragraph 3
-Subparagraph (c)
-Publisher FASB
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Reference 5: http://www.xbrl.org/2003/role/disclosureRef
-Topic 715
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-Name Accounting Standards Codification
-Section S99
-Paragraph 2
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Reference 6: http://www.xbrl.org/2003/role/disclosureRef
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Reference 7: http://www.xbrl.org/2003/role/exampleRef
-Topic 715
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Reference 8: http://www.xbrl.org/2003/role/disclosureRef
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Reference 9: http://www.xbrl.org/2003/role/disclosureRef
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Reference 10: http://www.xbrl.org/2003/role/disclosureRef
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Reference 11: http://www.xbrl.org/2003/role/disclosureRef
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Reference 13: http://www.xbrl.org/2003/role/disclosureRef
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Reference 14: http://www.xbrl.org/2003/role/disclosureRef
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-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480506/715-20-50-1

+ Details

Other comprehensive income (loss)

12 Months Ended

Dec. 31, 2025

Other Comprehensive Income (Loss), Net of Tax [Abstract]

Other comprehensive income (loss)

The following table summarizes the components of other comprehensive income (loss):


	Year Ending December 31,
	2025		2024		2023
	(in thousands)
Unrealized gains (losses) on fixed-maturity securities arising during the period, before income taxes:	$	86,490	$	(2,921)	$	49,384
Income tax (expense) benefit	(18,163)		613		(10,371)
Unrealized gains (losses) arising during the period, net of income taxes	68,327		(2,308)		39,013
Less reclassification adjustment:
Net realized investment gains (losses) on available-for-sale investments	2,297		(170)		(1,443)
Income tax (expense) benefit	(482)		36		303
Reclassification adjustment included in net income	1,815		(134)		(1,140)
Change in allowance for credit losses on investments, before income taxes	(2)		526		(187)
Income tax (expense) benefit	—		(111)		39
Reclassification adjustment included in net income	(2)		415		(148)
Other comprehensive income (loss)	$	66,514	$	(2,589)	$	40,301

The sale of or credit loss on an available-for-sale security results in amounts being reclassified from accumulated other comprehensive income to realized gains or losses in current period earnings. The related tax effect of the reclassification adjustment is recorded in income tax expense in current period earnings. See Note 2 for additional information.

Underwriting information

12 Months Ended

Dec. 31, 2025

Segment Reporting [Abstract]

Underwriting information

Segment and underwriting information

The Company has one reportable segment, the Excess and Surplus Lines Insurance segment, which primarily offers commercial excess and surplus lines liability and property insurance products through its underwriting divisions in the United States. The Company reports operating and financial results in a single segment based on the Company's exclusive focus on property and casualty insurance in the excess and surplus lines market and the consolidated information used by the chief operating decision maker ("CODM") in evaluating the financial performance of its business and allocating resources.

The Company's CODM is the Chief Executive Officer. The CODM uses consolidated net income to allocate resources primarily during the annual budgeting process and uses that measure to assess performance by considering budget-to-actual variances and evaluating financial results. The measure of segment assets is reported on the consolidated balance sheets as total assets. The accounting policies used to prepare the segment reporting data are the same as those described in Note 1.


	Year Ended December 31,
	2025		2024		2023
	(in thousands)
Revenues:
Net earned premiums	$	1,575,842	$	1,350,470	$	1,072,537
Fee income	40,714		34,118		27,026
Net investment income	192,192		150,287		102,335
Change in fair value of equity securities	58,836		43,367		15,277
Net realized investment gains	4,390		6,831		6,040
Change in allowance for credit losses on investments	(2)		526		(187)
Other income (1)	2,015		1,926		1,421
Total revenues	1,873,987		1,587,525		1,224,449
Expenses:
Losses and loss adjustment expenses - current year	923,160		785,036		631,407
Losses and loss adjustment expenses - catastrophes	30,350		25,518		4,586
Losses and loss adjustment expenses - prior year development	(62,817)		(37,655)		(35,774)
Net commissions incurred	166,802		134,184		113,717
Salaries, employee benefits and bonus expense	128,917		109,319		85,689
Credit loss expense - premiums receivable	10,503		17,397		9,790
Depreciation (2)	4,777		4,686		2,655
Interest expense	10,646		10,134		10,301
Other segment items (3)	27,347		24,190		18,061
Income tax expense	130,688		99,873		75,924
Segment net income	503,614		414,843		308,093
Reconciliation of profit or loss:
Adjustments and reconciling items	—		—		—
Consolidated net income	$	503,614	$	414,843	$	308,093

(1) Other income primarily includes income generated from the Company's real estate operations.

(2) Excludes depreciation expense allocated to loss adjustment expenses and investment expenses

(3) Other segment items primarily includes other general and administrative expenses such as technology costs, facility expenses and audit and inspection costs.

Gross written premiums by underwriting division are presented below:


	Year Ended December 31,
	2025		2024		2023
	(in thousands)
Commercial:
Commercial Property	$	374,451	$	456,170	$	411,956
Excess Casualty	276,998		245,137		194,049
General Casualty	207,888		169,162		118,745
Small Business Casualty	202,412		195,593		174,080
Construction	147,601		148,558		137,902
Small Business Property	102,413		76,800		43,893
Allied Health	96,982		83,058		67,808
Entertainment	70,049		55,168		36,566
Products Liability	67,883		67,035		61,786
Commercial Auto	48,721		35,047		19,050
Energy	46,102		42,710		38,637
Excess Professional	41,453		32,633		24,033
Life Sciences	35,284		36,252		41,379
Inland Marine	33,525		27,184		18,669
Professional Liability	33,091		35,104		36,087
Environmental	31,559		30,372		25,938
Health Care	25,821		23,179		20,378
Management Liability	18,582		21,705		26,617
Public Entity	18,121		20,047		20,027
Agribusiness - Casualty	13,671		5,850		2,309
Aviation	9,659		8,591		6,453
Agribusiness - Property	8,669		—		—
Ocean Marine	3,761		3,655		2,339
Product Recall	2,686		2,397		1,637

Total commercial	1,917,382		1,821,407		1,530,338
Personal:
High Value Homeowners	36,062		26,844		14,295
Personal Insurance	23,727		22,090		24,182
Total personal	59,789		48,934		38,477
Total	$	1,977,171	$	1,870,341	$	1,568,815

Certain prior year amounts are reclassified to conform to current year's divisions and the business underwritten within them.

Commercial Property underwrites first-party coverage on manufacturing facilities, government and municipal buildings, professional buildings, offices and general commercial properties, vacant properties, as well as entertainment and retail facilities.

Excess Casualty underwrites excess liability over risks that would fit within the general casualty, construction, products liability and small business casualty divisions. Coverage is written over the Company's primary liability policies as well as those of other insurers. This division also writes excess liability over primary commercial auto liability policies written by other carriers.

General Casualty underwrites general liability and liquor liability on hospitality, habitational and retail risks, among others, with similar premises liability loss exposures.

Small Business Casualty underwrites commercial general liability on smaller risks, generally businesses with revenues not exceeding $2.5 million, with an emphasis on artisan contractors and premises related exposures.

Construction underwrites commercial general liability coverage on contractors focusing on new residential construction, residential remodeling and renovation and commercial construction.

Small Business Property underwrites Commercial Property coverage for smaller properties, generally with total insured values not exceeding $5.0 million, including banks, daycare centers, strip malls, and greenhouses, among others.

Allied Health underwrites commercial general liability, professional liability and excess liability on allied health and social service risks including assisted living facilities, home health care agencies and outpatient medical facilities.

Entertainment underwrites commercial general liability for small-to-medium sized entertainment classes, including such classes as bowling alleys, campgrounds, escape rooms, fitness centers, museums and paintball facilities, among others.

Products Liability underwrites commercial general liability on manufacturers, distributors and importers of a wide array of consumer, commercial and industrial products.

Commercial Auto underwrites garage liability and excess auto coverages.

Energy underwrites commercial general liability, pollution liability, professional liability and excess liability on enterprises engaged in the business of energy production or distribution or mining including drillers, lease operators, contractors, product manufacturers and alternative energy.

Excess Professional underwrites excess coverage over an array of insurance products in Allied Health, Management Liability, Health Care and Professional Liability.

Life Sciences underwrites general liability, products liability and professional liability coverage for manufacturers, distributors and developers of dietary supplements, medical devices, pharmaceuticals, biologics, health and beauty products, durable medical equipment and clinical trials.

Inland Marine underwrites a variety of inland marine coverages including builders risk, contractors' equipment, transportation risks and mobile equipment.

Professional Liability underwrites small-to-medium sized non-medical professional liability risks. The classes of risks include accountants, architects and engineers, financial planners, insurance agents, lawyers, realtors and certain other professions.

Environmental underwrites commercial general liability, pollution liability and professional liability on a wide range of commercial risks where environmental exposures exist that are operational in nature or related to the premises.

Health Care underwrites medical professional liability for physicians, surgeons, dentists, chiropractors and podiatrists. Policies cover both individuals and small practice groups.

Management Liability underwrites directors and officers liability, employment practices liability and fiduciary liability coverage on a variety of commercial and government risks.

Public Entity underwrites law enforcement professional liability and school board liability.

Agribusiness Casualty underwrites general liability coverage for operations, manufacturers and land related to the agriculture industry.

Aviation underwrites general liability coverage for small-to-medium sized aviation-related businesses.

Agribusiness Property underwrites property and excess liability coverage for a wide variety of agricultural-related occupancies and equipment.

Ocean Marine underwrites marine cargo coverage for small-to-medium sized risks that transport goods and products in domestic inland waterways and certain U.S. coastal waters.

Product Recall underwrites recall expense and liability coverage for life sciences and general products sector consumable, commercial and consumer goods.

High Value Homeowners underwrites first party homeowners' coverage on homes valued above $1.0 million on a primary and excess basis.

Personal Insurance writes homeowners' coverage on manufactured homes with catastrophe exposure due to coastal location.

The Company does business with three unaffiliated insurance brokers that generated $371.2 million, $339.0 million and $231.2 million of gross written premiums for the year ended December 31, 2025, representing 18.8%, 17.1% and 11.7% of gross written premiums, respectively. No other broker generated 10.0% or more of the gross written premiums for the year ended December 31, 2025.

- Definition

The entire disclosure for reporting segments including data and tables. Reportable segments include those that meet any of the following quantitative thresholds a) it's reported revenue, including sales to external customers and intersegment sales or transfers is 10 percent or more of the combined revenue, internal and external, of all operating segments b) the absolute amount of its reported profit or loss is 10 percent or more of the greater, in absolute amount of 1) the combined reported profit of all operating segments that did not report a loss or 2) the combined reported loss of all operating segments that did report a loss c) its assets are 10 percent or more of the combined assets of all operating segments.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 280
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 21
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482810/280-10-50-21

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
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Reference 3: http://www.xbrl.org/2003/role/disclosureRef
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+ Details

Statutory financial information

12 Months Ended

Dec. 31, 2025

Statutory Accounting Practices, Statutory Amount Available for Dividend Payments [Abstract]

Statutory financial information

Kinsale Insurance maintains its accounts in conformity with accounting practices prescribed or permitted by state regulatory authorities that vary in certain respects from U.S. GAAP. In converting from statutory accounting principles to U.S. GAAP, typical adjustments include deferral of policy acquisition costs, the inclusion of statutory non-admitted assets and the inclusion of net unrealized gains or losses relating to fixed maturities in stockholders’ equity. The Company does not use any permitted practices that are different from prescribed statutory accounting practices.

Statutory net income and statutory capital and surplus for Kinsale Insurance as of December 31, 2025, 2024, and 2023 and for the years then ended are summarized as follows:


	Year ended December 31,
	2025		2024		2023
	(in thousands)
Statutory net income	$	447,965	$	357,896	$	259,042
Statutory capital and surplus	$	1,933,169	$	1,525,851	$	1,167,382

Kinsale Insurance is subject to risk-based capital ("RBC") requirements. RBC is a method developed by the National Association of Insurance Commissioners ("NAIC") to determine the minimum amount of statutory capital appropriate for an insurance company to support its overall business operations in consideration of its size and risk profile. The formula for determining the amount of RBC is calculated using various factors, weighted based on the perceived degree of risk, which are applied to certain financial balances and financial activity. The adequacy of a company’s actual capital is evaluated by a comparison to the RBC results, as determined by the formula. Companies that do not maintain statutory capital and surplus at a level in excess of the company action level RBC are required to take specified actions. At December 31, 2025 and 2024, actual statutory capital and surplus for Kinsale Insurance substantially exceeded the regulatory requirements.

Dividend payments to Kinsale from Kinsale Insurance are restricted by state insurance laws as to the amount that may be paid without prior approval of the regulatory authorities of Arkansas. The maximum dividend distribution is limited by Arkansas law to the greater of 10% of policyholder surplus as of December 31 of the previous year or statutory net income, not including realized capital gains, for the previous calendar year. Dividend payments are further limited to that part of available policyholder surplus which is derived from net profits on its business. The maximum dividend distribution that can be paid by Kinsale Insurance during 2026 without prior approval is $444.3 million.

Subsequent Events	12 Months Ended
Subsequent Events	Dec. 31, 2025
Subsequent Events [Abstract]
Subsequent Events	Subsequent event In January 2025, a series of wildfires began in Southern California. The Company is evaluating the impact of such wildfires and currently estimates pre-tax catastrophe losses of approximately $25.0 million, net of reinsurance, to be reflected in the first quarter of 2025. These estimates are subject to change due to the ongoing nature of these events and the complexity of the claims.

SEC Schedule, Article 12-15, Summary of Investments - Other than Investments in Related Parties

12 Months Ended

Dec. 31, 2025

SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Abstract]

SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties

Schedule I

KINSALE CAPITAL GROUP, INC. AND SUBSIDIARIES

Summary of Investments—Other than Investments in Related Parties


Type of Investment	Cost or Amortized Cost		Fair Value (if applicable)		Amount at which shown on Balance Sheet
	(in thousands)
Fixed maturities:
U.S. Treasury securities and obligations of U.S. government agencies	$	861	$	874	$	874
Obligations of states, municipalities and political subdivisions	146,222		127,860		127,860
Corporate and other securities	1,711,348		1,713,888		1,713,888
Asset-backed securities	582,780		588,519		588,519
Residential mortgage-backed securities	1,491,642		1,459,270		1,459,270
Commercial mortgage-backed securities	449,872		451,039		451,039
Total fixed maturities	4,382,725		4,341,450		4,341,450

Equity securities:
Common stocks:
ETFs (industrial, miscellaneous and all other)	104,371		185,523		185,523
Banks, trust and insurance companies	72,292		90,878		90,878
Industrial, miscellaneous and all other	281,325		325,898		325,898
Non-redeemable preferred stock	24,938		24,100		24,100
Total equity securities	482,926		626,399		626,399


Short-term investments	3,864		3,864		3,864
Real estate investments (none acquired in satisfaction of debt)	55,236				55,236
Total investments	$	4,924,751			$	5,026,949

See accompanying Report of Independent Registered Public Accounting Firm.

Schedule II - Condensed Financial Information of Registrant

12 Months Ended

Dec. 31, 2025

Condensed Financial Information Disclosure [Abstract]

Condensed Financial Information of Parent Company Only Disclosure

KINSALE CAPITAL GROUP, INC. AND SUBSIDIARIES

Condensed Financial Information of Registrant

Balance Sheets (Parent Company Only)


	December 31,
	2025		2024
	(in thousands)
Assets
Cash and cash equivalents	$	49,969	$	12,336
Due from subsidiaries	33,941		52,296
Investment in subsidiaries	2,103,519		1,604,811
Deferred income tax asset, net	2,388		2,527

Other assets	648		664
Total assets	$	2,190,465	$	1,672,634

Liabilities and Stockholders' Equity
Liabilities:
Accounts payable and accrued expenses	$	2,752	$	2,001

Income taxes payable	3,603		2,842
Debt	224,397		184,122
Other liabilities	130		108
Total liabilities	230,882		189,073

Stockholders’ equity:


Common stock	234		233
Additional paid-in capital	373,681		361,398
Retained earnings	1,716,945		1,229,136
Accumulated other comprehensive loss	(30,692)		(97,206)
Treasury stock, at cost	(100,585)		(10,000)
Stockholders’ equity	1,959,583		1,483,561
Total liabilities and stockholders’ equity	$	2,190,465	$	1,672,634

See accompanying notes to condensed financial information.

See accompanying Report of Independent Registered Public Accounting Firm.

Schedule II

KINSALE CAPITAL GROUP, INC. AND SUBSIDIARIES

Condensed Financial Information of Registrant

Statements of Income and Comprehensive Income (Parent Company Only)


	Years Ended December 31,
	2025		2024		2023
	(in thousands)
Revenues:
Management fees from subsidiaries	$	20,822	$	16,769	$	11,918
Net investment income	1,186		641		—

Total revenues	22,008		17,410		11,918

Expenses:
Operating expenses	21,938		17,193		13,007
Interest expense	10,646		10,134		10,301
Other expenses	—		615		—
Total expenses	32,584		27,942		23,308
Loss before income taxes	(10,576)		(10,532)		(11,390)
Income tax benefit	(6,996)		(12,346)		(7,324)
(Loss) income before equity in net income of subsidiaries	(3,580)		1,814		(4,066)
Equity in undistributed earnings of subsidiaries	507,194		413,029		312,159
Net income	503,614		414,843		308,093

Other comprehensive income (loss):
Equity in other comprehensive income (losses) of subsidiaries	66,514		(2,589)		40,301
Total comprehensive income	$	570,128	$	412,254	$	348,394

See accompanying notes to condensed financial information.

See accompanying Report of Independent Registered Public Accounting Firm.

Schedule II

KINSALE CAPITAL GROUP, INC. AND SUBSIDIARIES

Condensed Financial Information of Registrant

Statements of Cash Flows (Parent Company Only)


	Years Ended December 31,
	2025		2024		2023
	(in thousands)
Operating activities
Net income	$	503,614	$	414,843	$	308,093
Adjustments to reconcile net income to net cash provided by (used in) operating activities:
Deferred tax expense (benefit)	139		(854)		(372)
Stock compensation expense	17,884		14,146		9,361
Equity in undistributed earnings of subsidiaries	(507,194)		(413,029)		(312,159)
Changes in operating assets and liabilities	18,645		(25,795)		55,893
Current taxes payable	761		(359)		—
Change in accounts payable and accrued expenses	164		(41)		—
Dividends received from subsidiary	105,000		47,000		—
Net cash provided by operating activities	139,013		35,911		60,816

Investing activities

Contributions to subsidiary	(30,000)		(11,000)		(50,000)
Net cash used in investing activities	(30,000)		(11,000)		(50,000)

Financing activities

Proceeds from credit facility	40,000		—		—
Proceeds from notes payable	—		—		50,000
Repayment of credit facility	—		—		(62,000)
Debt issuance costs	—		—		(164)
Payroll taxes withheld and remitted on share-based payments	(6,281)		(7,047)		(4,282)
Common stock issued, stock options exercised	681		1,330		877
Dividends paid	(15,782)		(13,940)		(12,954)
Treasury stock acquired — share repurchases	(89,998)		(10,000)		—

Net cash used in financing activities	(71,380)		(29,657)		(28,523)
Net change in cash and cash equivalents	37,633		(4,746)		(17,707)
Cash and cash equivalents at beginning of year	12,336		17,082		34,789
Cash and cash equivalents at end of year	$	49,969	$	12,336	$	17,082

See accompanying notes to condensed financial information.

See accompanying Report of Independent Registered Public Accounting Firm.

KINSALE CAPITAL GROUP, INC.

Condensed Financial Information of Registrant

Notes to Condensed Financial Information

(Parent Company Only)

1. Accounting policies

Organization

Kinsale Capital Group, Inc. (the "Company"), a Delaware domiciled insurance holding company, was formed on June 3, 2009 for the purpose of acquiring and managing insurance entities.

Basis of presentation

The accompanying condensed financial statements have been prepared using the equity method. Under the equity method, the investment in consolidated subsidiaries is stated at cost plus equity in undistributed earnings of consolidated subsidiaries since the date of acquisition. These condensed financial statements should be read in conjunction with the Company’s consolidated financial statements.

Estimates and assumptions

Preparation of the condensed financial statements in conformity with U.S. GAAP requires management to make estimates and assumptions that affect the amounts reported in the condensed financial statements and accompanying disclosures. Those estimates are inherently subject to change, and actual results may ultimately differ from those estimates.

Debt

Note Purchase and Private Shelf Agreement

On July 22, 2022, the Company entered into a Note Purchase and Private Shelf Agreement (as subsequently amended, the "Note Purchase Agreement") with PGIM, Inc. ("Prudential") and the purchasers of the Series A and Series B Senior Notes (as defined below). The Note Purchase Agreement provides for issuance of senior promissory notes with an aggregate principal amount of up to $200.0 million through September 18, 2026.

Pursuant to the Note Purchase Agreement, on July 22, 2022, the Company issued $125.0 million aggregate principal amount of 5.15% Series A Senior Notes Due July 22, 2034 (collectively, the "Series A Notes”), and on September 18, 2023, the Company issued a $50.0 million aggregate principal amount 6.21% Series B Senior Note ("Series B Note") due July 22, 2034.

The Series A and B Notes are senior unsecured obligations of the Company and rank pari passu with the Company’s Amended and Restated Credit Agreement.

Principal payments on the Series A Notes are required annually beginning on July 22, 2030 in equal installments of $25.0 million through July 22, 2034.

Principal payments on the Series B Note are required annually beginning on July 22, 2030 in equal installments of $10.0 million through July 22, 2034.

Credit Agreement

On July 22, 2022, the Company entered into an Amended and Restated Credit Agreement, with JPMorgan Chase Bank, N.A., as administrative agent and as issuing bank, Truist Bank, as syndication agent, and the lenders party

thereto (collectively, the "Lenders"). The Amended and Restated Credit Agreement provides the Company with a $100.0 million senior unsecured revolving credit facility (the "Credit Facility"), with the option to increase the aggregate commitment by $30.0 million. The Company is required to pay a Commitment Fee Rate (as defined therein) of 0.25% on the average daily amount of the Available Revolving Commitment (as defined therein). Borrowings under the Amended and Restated Credit Agreement may be used for general corporate purposes (which may include, without limitation, to fund future growth, to finance working capital needs, to fund capital expenditures, and to refinance, redeem or repay indebtedness). During the year ended December 31, 2025, the Company drew down $40.0 million from the Credit Facility.

The loans under the Amended and Restated Credit Agreement bear interest, at the Company's option, at a rate equal to the Adjusted Term SOFR Rate (as defined therein) plus 1.625% or the Alternate Base Rate (as defined therein) plus 0.625%. For the year ended December 31, 2025, the annual weighted-average interest rate of borrowings under the Credit Facility was 5.83%.

The following table presents the Company's outstanding debt as of December 31, 2025 and 2024:



	Issuance	Maturities	December 31, 2025		December 31, 2024
			(in thousands)
Credit Facility	Various	7/22/2027	$	51,000	$	11,000
5.15% Series A Notes	7/22/2022	7/22/2034	125,000		125,000
6.21% Series B Note	9/18/2023	7/22/2034	50,000		50,000
Less: Unamortized debt issuance costs			(1,603)		(1,878)
Total debt			$	224,397	$	184,122

Interest paid under both agreements totaled $10.4 million, $10.3 million and $10.5 million for the years ended December 31, 2025, 2024 and 2023, respectively.

The following table summarizes the future principal payments on outstanding debt as of December 31, 2025:


Years Ending December 31,	Senior Notes		Credit Facility		Total
	(in thousands)
2026	$	—	$	—	$	—
2027	—		51,000		51,000
2028	—		—		—
2029	—		—		—
2030	35,000		—		35,000
2031 and thereafter	140,000		—		140,000
Total principal payments	$	175,000	$	51,000	$	226,000

Both the Note Purchase Agreement and the Amended and Restated Credit Agreement contain representations and affirmative and negative covenants, including financial covenants customary for agreements of this type, as well as customary events of default provisions. In December 2025, the covenants limiting restricted payments under the Note Purchase Agreement and Amended and Restated Credit Agreement were amended to allow the Company to make restricted payments so long as at the time of the declaration of such restricted payment, no event of default under the Note Purchase Agreement has occurred and is continuing or would arise after giving effect, on a pro forma basis, to such restricted payment if such restricted payment were to be made at such time of declaration.

As of December 31, 2025, the Company was in compliance with all of its financial covenants under both the Note Purchase Agreement and the Credit Facility.

Dividends from subsidiary

Cash dividends paid to Kinsale Capital Group, Inc. by its wholly-owned subsidiary, Kinsale Insurance Company, were $105.0 million and $47.0 million for the years ended December 31, 2025 and 2024. There were no cash dividends paid by the insurance subsidiary for the year ended December 31, 2023.

Contingencies

Liabilities for loss contingencies, arising from non-insurance policy claims, assessments, litigation, fines, and penalties and other sources, are recorded when it is probable that a liability has been incurred and the amount of the assessment and/or remediation can be reasonably estimated. Legal costs incurred in connection with loss contingencies are expensed as incurred.

Schedule V - Valuation and Qualifying Accounts

12 Months Ended

Dec. 31, 2025

SEC Schedule, 12-09, Valuation and Qualifying Accounts [Abstract]

Schedule V - Valuation and Qualifying Accounts

Schedule V

KINSALE CAPITAL GROUP, INC. AND SUBSIDIARIES

Valuation and Qualifying Accounts


			Additions		Deductions
(in thousands)	Balance at Beginning of Period		Amounts Charged to Expense		Amounts Written Off or Disposals		Balance at End of Period

Year Ended December 31, 2025:
Allowance for premiums receivable	$	26,926	$	10,503	$	10,101	$	27,328
Valuation allowance for deferred tax assets	9,066		1,053		—		10,119
Allowance for reinsurance recoverables	932		140		—		1,072
Allowance for credit losses on fixed-maturity investments	27		16		14		29

Year Ended December 31, 2024:
Allowance for premiums receivable	13,383		17,397		3,854		26,926
Valuation allowance for deferred tax assets	6,182		2,884		—		9,066
Allowance for reinsurance recoverables	744		188		—		932
Allowance for credit losses on fixed-maturity investments	553		(47)		479		27

Year Ended December 31, 2023:
Allowance for premiums receivable	8,067		9,790		4,474		13,383
Valuation allowance for deferred tax assets	5,188		994		—		6,182
Allowance for reinsurance recoverables	459		285		—		744
Allowance for credit losses on fixed-maturity investments	366		199		12		553

See accompanying Report of Independent Registered Public Accounting Firm.

Insider Trading Arrangements	3 Months Ended
Insider Trading Arrangements	Dec. 31, 2025
Trading Arrangements, by Individual
Material Terms of Trading Arrangement	Securities Trading Plans of Directors and Executive Officers Transactions in our securities by our directors and executive officers are required to be made in accordance with our Policy on the Prevention of Insider Trading and Selective Disclosure (the "Insider Trading Policy"), which, among other things, requires that the transactions be in accordance with applicable U.S. federal securities laws that prohibit trading while in possession of material nonpublic information. Rule 10b5-1 under the Exchange Act provides an affirmative defense that enables prearranged transactions in securities in a manner that avoids concerns about initiating transactions at a future date while possibly in possession of material nonpublic information. Our Insider Trading Policy permits our directors and executive officers to enter into trading plans designed to comply with Rule 10b5-1. During the fourth quarter of 2025, none of our directors or executive officers adopted, modified or terminated a Rule 10b5-1 trading plan or adopted, modified or terminated a non-Rule 10b5-1 trading arrangement (as defined in Item 408(c) of Regulation S-K).
Rule 10b5-1 Arrangement Adopted	false
Non-Rule 10b5-1 Arrangement Adopted	false
Rule 10b5-1 Arrangement Terminated	false
Non-Rule 10b5-1 Arrangement Terminated	false

Insider Trading Policies and Procedures	12 Months Ended
Insider Trading Policies and Procedures	Dec. 31, 2025
Insider Trading Policies and Procedures [Line Items]
Insider Trading Policies and Procedures Adopted	true

Cybersecurity Risk Management and Strategy Disclosure	12 Months Ended
Cybersecurity Risk Management and Strategy Disclosure	Dec. 31, 2025
Cybersecurity Risk Management, Strategy, and Governance [Line Items]
Cybersecurity Risk Management Processes for Assessing, Identifying, and Managing Threats [Text Block]	Risk management and strategy The Company’s risk management process includes the identification, assessment and management of material risks from various sources, including risks related to cybersecurity and information technology. The Company uses information from multiple sources, including internal incident history, industry publications and analysis centers, public reporting, government and industry information sharing organizations and recognized information security frameworks to inform its risk management program. Management employs a combination of preventative and detective cybersecurity measures designed to protect the confidentiality, integrity and availability of the Company's information systems and data, including, but not limited to •Maintaining a vulnerability management program, •implementing and operating controls over logical access provisioning, •maintaining an enterprise-wide security awareness program and •administering periodic cybersecurity trainings. The Company engages third-party vendors with specialized expertise to support various aspects of its cybersecurity program, including continuous threat detection and response coverage, endpoint detection, anti-malware, penetration testing and suspicious activity alerting, among others. While the Company leverages third party service providers, management retains responsibility for the security and resiliency of the Company's information assets. The Company maintains an incident response plan designed to enable timely detection, escalation, containment and remediation of cybersecurity incidents that includes escalation criteria and preliminary materiality assessment considerations to guide business continuity and disclosure objectives.
Cybersecurity Risk Management Third Party Engaged [Flag]	true
Cybersecurity Risk Materially Affected or Reasonably Likely to Materially Affect Registrant [Text Block]	We describe cybersecurity-related risks that could materially impact our business strategy, results of operations or financial condition under the heading “Risk Factors.” Potential material impacts of a cybersecurity incident may include, among other things, loss of access to systems and data, financial costs, operational disruption, regulatory scrutiny, litigation and reputational harm.
Cybersecurity Risk Board of Directors Oversight [Text Block]	The Company's Board of Directors ("the Board") is responsible for receiving periodic updates on cybersecurity and information security risks and reviewing and discussing with management the quality and effectiveness of the Company’s efforts to mitigate such risks. Management informs the Board about the Company's cybersecurity risk posture, including prevention, detection, mitigation and remediation activities no less frequently than semi-annually and provides updates as appropriate in connection with material developments, while management continues to monitor such matters on an ongoing basis.
Cybersecurity Risk Board Committee or Subcommittee Responsible for Oversight [Text Block]	The Company's Board of Directors ("the Board") is responsible for receiving periodic updates on cybersecurity and information security risks and reviewing and discussing with management the quality and effectiveness of the Company’s efforts to mitigate such risks. Management informs the Board about the Company's cybersecurity risk posture, including prevention, detection, mitigation and remediation activities no less frequently than semi-annually and provides updates as appropriate in connection with material developments, while management continues to monitor such matters on an ongoing basis.
Cybersecurity Risk Role of Management [Text Block]	Our Chief Executive Officer ("CEO") is responsible for assessing and managing overall material risks to the Company. With respect to cybersecurity risks, our CEO oversees and leverages the collective expertise of the Company’s information security function which reports to our CEO through the Company’s Chief Information Officer. The information security function is staffed with individuals with relevant information security professional experience, including in the financial services sector, as well as educational experience and industry-recognized credentials.
Cybersecurity Risk Management Positions or Committees Responsible [Flag]	true
Cybersecurity Risk Management Expertise of Management Responsible [Text Block]	With respect to cybersecurity risks, our CEO oversees and leverages the collective expertise of the Company’s information security function which reports to our CEO through the Company’s Chief Information Officer. The information security function is staffed with individuals with relevant information security professional experience, including in the financial services sector, as well as educational experience and industry-recognized credentials.
Cybersecurity Risk Process for Informing Management or Committees Responsible [Text Block]	Management informs the Board about the Company's cybersecurity risk posture, including prevention, detection, mitigation and remediation activities no less frequently than semi-annually and provides updates as appropriate in connection with material developments, while management continues to monitor such matters on an ongoing basis.

Summary of significant accounting policies (Policies)

12 Months Ended

Dec. 31, 2025

Accounting Policies [Abstract]

Principles of consolidation

The accompanying consolidated financial statements include the accounts of Kinsale Capital Group, Inc. and its wholly-owned subsidiaries. All significant intercompany balances and transactions have been eliminated in consolidation. Certain prior year amounts have been reclassified to conform to the current year's presentation.

Use of estimates

The preparation of consolidated financial statements in conformity with U.S. generally accepted accounting principles ("U.S. GAAP") requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities, disclosure of contingent assets and liabilities, if any, at the date of the consolidated financial statements and the reported amounts of revenues and expenses during the reporting period. Actual results could differ from those estimates. Management periodically reviews its estimates and assumptions. These reviews include evaluating the adequacy of reserves for unpaid losses and loss adjustment expenses, allowance for credit losses and uncollectible reinsurance, fair value of investments, as well as evaluating the investment portfolio for credit impairments.

Cash and cash equivalents

The Company considers all highly liquid investments with an original maturity of three months or less to be cash equivalents.

Short-term investments

Short-term investments are carried at amortized cost, which approximates fair value. Short-term investments have maturities greater than three months but less than one year at the date of purchase.

Fixed maturity and equity securities

Fixed-maturity and equity securities

Fixed-maturity securities are classified as available-for-sale and reported at fair value. Unrealized gains and losses on these securities are excluded from earnings but are recorded as a separate component of other comprehensive income and stockholders' equity, net of deferred income taxes.

Equity securities are reported at fair value. Changes in unrealized gains and losses in fair value of these investments are recognized in net income.

The Company regularly reviews all its available-for-sale investments with unrealized losses to assess whether the decline in the fair value is deemed to be a credit loss. See Note 2 for further discussion regarding the determination of credit losses.

Interest on fixed-maturity securities is credited to earnings as it accrues. Premiums and discounts are amortized or accreted using the effective interest method over the lives of the related fixed maturities, or to the earliest call date for

securities purchased at a premium. This method includes an adjustment for estimated principal prepayments, if any, on asset- and mortgage-backed securities. To the extent that the estimated lives of such securities change as a result of changes in estimated prepayment rates, the adjustments are included in net investment income using the retrospective method.

Dividends on equity securities are included in earnings on the ex-dividend date.

Realized gains and losses on disposition of investments are based on specific identification of the investments sold on the trade date.

Investment Real Estate

Real estate investments

Real estate investments include real estate and the related assets purchased for investment purposes. Real estate and the related depreciable assets are carried at cost, net of accumulated depreciation. Depreciation is calculated on a straight-line basis over the estimated useful life of the assets and is included in net investment income. Rental income is recognized on a straight-line basis over the term of the respective lease and is included in net investment income. Land is not depreciated. Real estate is evaluated for impairment when events or circumstances indicate the carrying value of the real estate may not be recoverable.

Reinsurance

Reinsurance premiums, commissions, and ceded unearned premiums on reinsured business are accounted for on a basis consistent with that used in accounting for the original policies issued and the terms of the reinsurance contracts. The Company receives ceding commissions in accordance with certain reinsurance treaties. The ceding commissions are capitalized and amortized as a reduction of underwriting, acquisition and insurance expenses.

Reinsurance recoverables represent paid losses and loss adjustment expenses and reserves for unpaid losses and loss adjustment expenses ceded to reinsurers that are subject to reimbursement under reinsurance treaties. The method for determining reinsurance recoverables for unpaid losses and loss adjustment expenses involves reviewing actuarial estimates of gross unpaid losses and loss adjustment expenses to determine the Company's ability to cede unpaid losses and loss adjustment expenses under the Company's existing reinsurance contracts. This method is continually reviewed and updated and any resulting adjustments are reflected in earnings in the period identified. See Note 8 for a further discussion of the Company's reinsurance program.

Premiums receivable, net

Premiums receivable balances are carried at face value, net of any allowance for credit losses. The allowance for credit losses represents an estimate of amounts considered uncollectible based on the Company’s assessment of the collectability of receivables that are past due. The estimate considers historical loss data, current and future economic conditions and specific identification of collectability concerns where applicable. The following table presents the rollforward of the allowance for credit losses for premiums receivable for the years ended December 31, 2025 and 2024:


	Year Ended December 31,
	2025		2024
	(in thousands)
Beginning balance	$	26,926	$	13,383
Current period change for estimated uncollectible premiums	10,503		17,397
Write-offs of uncollectible premiums receivable	(10,101)		(3,854)

Ending balance	$	27,328	$	26,926

Deferred policy acquisition costs, net of ceding commissions

The Company defers commissions, net of ceding commissions, and certain other costs that are directly related to the successful acquisition of insurance contracts. All eligible costs are capitalized and charged to expense in proportion to premium earned over the estimated policy life. To the extent that unearned premiums on existing policies are not adequate to cover the related costs and expenses, referred to as a premium deficiency, deferred policy acquisition costs are charged to earnings. The Company considers anticipated investment income in determining whether a premium deficiency exists.

Property and equipment, net

Property and equipment are stated at cost less accumulated depreciation. Depreciation of property and equipment is calculated using the straight-line method over the estimated useful lives of the assets. The estimated useful lives range from 39 years for the building and parking deck, 15 to 20 years for land improvements, 7 to 10 years for furniture and equipment, and 3 to 7 years for electronic data processing hardware and software.

Property and equipment are included in other assets in the accompanying consolidated balance sheets and consists of the following:


	December 31,
	2025		2024
	(in thousands)
Building	$	66,763	$	37,190
Parking deck	—		5,072
Land	—		3,068
Equipment	5,375		4,401
Software	27,136		20,203
Furniture and fixtures	6,157		3,200
Leasehold improvements	—		153
Land improvements	129		474
Construction in progress - building	376		26,530
	105,936		100,291
Accumulated depreciation	(16,505)		(17,367)
Total property and equipment, net	$	89,431	$	82,924

In 2024, construction in progress included capitalized expenses related to the development of the Company's new corporate headquarters building. Construction of the new headquarters building was substantially completed in the fourth quarter of 2025 and was placed into service. Upon moving operations to the new headquarters, the Company reclassified its former headquarters and related assets from property and equipment to real estate investments due to a change in the intended use of the former property.

Indefinite-Lived intangible assets

Indefinite-lived intangible assets

Indefinite-lived intangible assets are recorded at fair value at the date of acquisition. The Company's indefinite-lived intangible assets are comprised solely of regulatory approvals granted by the various state insurance departments to write insurance business in the respective states on a non-admitted basis. In accordance with U.S. GAAP, amortization of indefinite-lived intangible assets is not permitted. Indefinite-lived intangible assets are tested for impairment during the fourth quarter on an annual basis, or earlier if there is reason to suspect that their values may have been diminished or impaired. There were no impairments recognized in December 31, 2025, 2024, or 2023. In addition, as of December 31, 2025, no triggering events occurred that suggested an updated review was necessary.

Reserves for unpaid losses and loss adjustment expenses

Reserves for unpaid losses and loss adjustment expenses represent management's best estimate of ultimate unpaid cost of all reported and unreported losses and loss adjustment expenses incurred prior to the financial statement date. The estimates are based on several actuarial methods that use a variety of inputs including initial expected loss ratios, loss

development patterns, paid losses, reported losses, claim counts and price indices. All estimates are regularly reviewed and, as experience develops and new information becomes known, the reserves for unpaid losses and loss adjustment expenses are adjusted as necessary. Such adjustments are reflected in the results of operations in the period in which they are determined. Although management believes that the reserves for losses and loss adjustment expenses are reasonable, due to the inherent uncertainty in estimating reserves for unpaid losses and loss adjustment expenses, it is possible that the Company’s actual incurred losses and loss adjustment expenses will not develop in a manner consistent with the assumptions inherent in the determination of these reserves. If actual liabilities exceed recorded amounts, there will be an increase to the Company’s reserves resulting in a reduction in net income and stockholders’ equity in the period in which the deficiency is identified. Furthermore, management may determine that recorded reserves are more than adequate to cover expected losses which will result in a reduction to the reserves. The Company believes that the reserves for unpaid losses and loss adjustment expenses at December 31, 2025 and 2024 are adequate and represent a reasonable estimate of the Company's future obligations. See Note 7 for a further discussion of reserves for unpaid losses and loss adjustment expenses.

Revenue recognition

Premiums are recognized as revenue ratably over the term of the insurance contracts, net of ceded reinsurance. Unearned premiums are calculated on a daily pro rata basis. Fee income is recognized as revenue when the related premium is written.

Income taxes

Deferred income tax assets and liabilities are determined based on the differences between the recorded amounts and the tax bases of assets and liabilities, using enacted tax rates expected to be in effect during the year in which the basis differences reverse. The effect on deferred taxes of a change in tax rates is recognized in income in the period in which such change was enacted. Valuation allowances on deferred tax assets are estimated based on the Company's assessment of the realizability of such amounts. Valuation allowances are recorded when it is more likely than not that some portion, or all, of the deferred tax assets will not be realizable.

The Company provides for uncertain tax positions, and the related interest and penalties, based upon management’s assessment of whether a tax benefit is more likely than not to be sustained upon examination by tax authorities. To the extent that the anticipated tax outcome of these uncertain tax positions changes, such changes in estimate will impact the income tax provision in the period in which such determination is made. The Company recognizes accrued interest and penalties related to uncertain tax positions as a component of income tax expense.

The Company uses the portfolio approach to release stranded tax effects in accumulated other comprehensive income ("AOCI") related to its available-for-sale fixed-maturity securities. Under this approach, stranded tax effects remaining in AOCI are released only when the entire portfolio of the available-for-sale fixed-maturity securities are liquidated, sold or extinguished.

Commitments and contingencies

Contingencies

Liabilities for loss contingencies, arising from noninsurance policy claims, assessments, litigation, fines, and penalties and other sources, are recorded when it is probable that a liability has been incurred and the amount of the assessment and/or remediation can be reasonably estimated. Legal costs incurred in connection with loss contingencies are expensed as incurred.

Fair value of financial instruments

Fair value is estimated for each class of financial instrument based on the framework established in the fair value accounting guidance. This guidance requires an entity to maximize the use of observable inputs and minimize the use of unobservable inputs when measuring fair value. Fair value hierarchy disclosures are based on the quality of inputs used to measure fair value. The hierarchy gives the highest priority to unadjusted quoted prices in active markets for identical assets or liabilities (Level 1 measurements) and the lowest priority to unobservable inputs (Level 3 measurements).

See Note 3 for further details regarding fair value disclosures.

Stock-based compensation

Stock-based compensation is expensed based upon the estimated fair value of employee stock awards. Compensation cost for awards of equity instruments to employees is measured based on the grant-date fair value of those awards and compensation expense is recognized over the service period that the awards vest. Forfeitures of stock-based compensation awards are recognized as they occur. See Note 9 for further discussion and related disclosures regarding stock-based compensation.

Prospective accounting pronouncements

Recently adopted accounting pronouncements

Accounting Standards Update ("ASU") 2023-09 – Income Taxes (Topic 740): Improvements to Income Tax Disclosures

In December 2023, the FASB issued ASU 2023-09, "Income Taxes (Topic 740): Improvements to Income Tax Disclosures". The amended guidance enhances income tax disclosures primarily related to the effective tax rate reconciliation and income taxes paid information. This guidance requires disclosure of specific categories in the effective tax rate reconciliation and additional information on reconciling items meeting a quantitative threshold. In addition, the amended guidance requires disaggregating income taxes paid (net of refunds received) by federal, state, and foreign taxes. It also requires disaggregating individual jurisdictions in which income taxes paid (net of refunds received) are equal to or greater than 5 percent of total income taxes paid (net of refunds received). The amended guidance became effective for the year ended December 31, 2025. Refer to Note 6 for the Company's income tax disclosures.

Prospective accounting pronouncements

ASU 2024-03, Income Statement – Reporting Comprehensive Income – Expense Disaggregation Disclosures

In November 2024, the FASB issued ASU 2024-03, "Income Statement-Reporting Comprehensive Income-Expense Disaggregation Disclosures (Subtopic 220-40): Disaggregation of Income Statement Expenses," requiring public entities to disclose additional information about specific expense categories in the notes to the financial statements on an interim and annual basis. ASU 2024-03 is effective for fiscal years beginning after December 15, 2026, and for interim periods beginning after December 15, 2027, with early adoption permitted. The Company is currently evaluating the effect the guidance will have on its disclosures.

ASU 2025-06, Intangibles – Goodwill and Other – Internal-Use Software

In September 2025, the FASB issued ASU 2025-06, "Intangibles – Goodwill and Other – Internal-Use Software (Subtopic 350-40) Targeted Improvements to the Accounting for Internal-Use Software," to modernize the accounting for software costs that are accounted for under Subtopic 350-40, Intangibles – Goodwill and Other – Internal-Use Software. ASU 2025-06 is effective for fiscal years beginning after December 15, 2027, and for interim periods beginning after December 15, 2027, with early adoption permitted. The Company is currently evaluating the effect the guidance will have on its financial statements.

Accounting Policies (Tables)

12 Months Ended

Dec. 31, 2025

Accounting Policies [Abstract]

Property, Plant and Equipment

Property and equipment are included in other assets in the accompanying consolidated balance sheets and consists of the following:


	December 31,
	2025		2024
	(in thousands)
Building	$	66,763	$	37,190
Parking deck	—		5,072
Land	—		3,068
Equipment	5,375		4,401
Software	27,136		20,203
Furniture and fixtures	6,157		3,200
Leasehold improvements	—		153
Land improvements	129		474
Construction in progress - building	376		26,530
	105,936		100,291
Accumulated depreciation	(16,505)		(17,367)
Total property and equipment, net	$	89,431	$	82,924

In 2024, construction in progress included capitalized expenses related to the development of the Company's new corporate headquarters building. Construction of the new headquarters building was substantially completed in the fourth quarter of 2025 and was placed into service. Upon moving operations to the new headquarters, the Company reclassified its former headquarters and related assets from property and equipment to real estate investments due to a change in the intended use of the former property.

Premium Receivable, Allowance for Credit Loss

The following table presents the rollforward of the allowance for credit losses for premiums receivable for the years ended December 31, 2025 and 2024:


	Year Ended December 31,
	2025		2024
	(in thousands)
Beginning balance	$	26,926	$	13,383
Current period change for estimated uncollectible premiums	10,503		17,397
Write-offs of uncollectible premiums receivable	(10,101)		(3,854)

Ending balance	$	27,328	$	26,926

Investments (Tables)

12 Months Ended

Dec. 31, 2025

Investments [Abstract]

Available-for-sale Investments

The following tables summarize the Company’s available-for-sale investments at December 31, 2025 and 2024:


	December 31, 2025
	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses		Allowance for Credit Losses		Estimated Fair Value
	(in thousands)
Fixed maturities:
U.S. Treasury securities and obligations of U.S. government agencies	$	861	$	14	$	(1)	$	—	$	874
Obligations of states, municipalities and political subdivisions	146,222		51		(18,410)		(3)		127,860
Corporate and other securities	1,711,348		28,798		(26,232)		(26)		1,713,888
Asset-backed securities	582,780		6,377		(638)		—		588,519
Residential mortgage-backed securities	1,491,642		6,378		(38,750)		—		1,459,270
Commercial mortgage-backed securities	449,872		3,632		(2,465)		—		451,039
Total fixed-maturity investments	$	4,382,725	$	45,250	$	(86,496)	$	(29)	$	4,341,450


	December 31, 2024
	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses		Allowance for Credit Losses		Estimated Fair Value
	(in thousands)
Fixed maturities:
U.S. Treasury securities and obligations of U.S. government agencies	$	15,465	$	—	$	(417)	$	—	$	15,048
Obligations of states, municipalities and political subdivisions	168,894		46		(22,633)		(3)		146,304
Corporate and other securities	2,037,372		5,779		(53,638)		(23)		1,989,490
Asset-backed securities	729,658		4,606		(1,522)		—		732,742
Residential mortgage-backed securities	502,121		747		(53,994)		—		448,874
Commercial mortgage-backed securities	209,521		423		(4,838)		(1)		205,105
Total fixed-maturity investments	$	3,663,031	$	11,601	$	(137,042)	$	(27)	$	3,537,563

Debt Securities, Available-for-Sale, Allowance for Credit Loss

The following table presents changes in the allowance for expected credit losses on available-for-sale securities:


	Years Ended December 31,
	2025		2024
	(in thousands)
Beginning balance	$	27	$	553
Increase to allowance from securities for which credit losses were not previously recorded	—		3
Reduction from securities sold during the period	(14)		(479)
Net increase (decrease) from securities that had an allowance at the beginning of the period	16		(50)
Ending balance	$	29	$	27

Available-for-sale Securities in a Unrealized Loss Position

The following tables summarize gross unrealized losses and estimated fair value for available-for-sale investments by length of time that the securities have continuously been in an unrealized loss position:


	December 31, 2025
	Less than 12 Months				12 Months or Longer				Total
	Estimated Fair Value		Gross Unrealized Losses		Estimated Fair Value		Gross Unrealized Losses		Estimated Fair Value		Gross Unrealized Losses
	(in thousands)
Fixed maturities:
U.S. Treasury securities and obligations of U.S. government agencies	$	296	$	(1)	$	—	$	—	$	296	$	(1)
Obligations of states, municipalities and political subdivisions	1,043		(2)		118,027		(18,408)		119,070		(18,410)
Corporate and other securities	101,385		(597)		239,152		(25,635)		340,537		(26,232)
Asset-backed securities	92,682		(384)		7,759		(254)		100,441		(638)
Residential mortgage-backed securities	387,397		(779)		228,531		(37,971)		615,928		(38,750)
Commercial mortgage-backed securities	103,868		(296)		44,139		(2,169)		148,007		(2,465)
Total fixed-maturity investments	$	686,671	$	(2,059)	$	637,608	$	(84,437)	$	1,324,279	$	(86,496)


	December 31, 2024
	Less than 12 Months				12 Months or Longer				Total
	Estimated Fair Value		Gross Unrealized Holding Losses		Estimated Fair Value		Gross Unrealized Holding Losses		Estimated Fair Value		Gross Unrealized Holding Losses
	(in thousands)
Fixed maturities:
U.S. Treasury securities and obligations of U.S. government agencies	$	838	$	(13)	$	14,210	$	(404)	$	15,048	$	(417)
Obligations of states, municipalities and political subdivisions	27,049		(417)		114,620		(22,216)		141,669		(22,633)
Corporate and other securities	667,645		(9,139)		493,598		(44,499)		1,161,243		(53,638)
Asset-backed securities	121,371		(943)		24,656		(579)		146,027		(1,522)
Residential mortgage-backed securities	144,955		(1,934)		237,514		(52,060)		382,469		(53,994)
Commercial mortgage-backed securities	92,024		(960)		53,812		(3,878)		145,836		(4,838)
Total fixed-maturity investments	$	1,053,882	$	(13,406)	$	938,410	$	(123,636)	$	1,992,292	$	(137,042)

Contractual Maturities of Available-for-sale Fixed Maturity Securities

The amortized cost and estimated fair value of available-for-sale fixed-maturity securities at December 31, 2025 are summarized, by contractual maturity, as follows:


	Amortized		Estimated
	Cost		Fair Value
	(in thousands)
Due in one year or less	$	14,324	$	14,392
Due after one year through five years	868,804		879,532
Due after five years through ten years	695,323		700,466
Due after ten years	279,980		248,232
Asset-backed securities	582,780		588,519
Residential mortgage-backed securities	1,491,642		1,459,270
Commercial mortgage-backed securities	449,872		451,039
Total fixed maturities	$	4,382,725	$	4,341,450

Net Investment Income

The following table presents the components of net investment income:


	Year Ended December 31,
	2025		2024		2023
	(in thousands)
Interest:
Taxable bonds	$	180,911	$	143,242	$	92,227
Municipal bonds (tax exempt)	1,390		1,592		2,217
Cash equivalents and short-term investments	6,185		3,012		3,004
Dividends on equity securities	8,602		6,442		5,097
Real estate investment income	—		153		3,716
Gross investment income	197,088		154,441		106,261
Investment expenses	(4,896)		(4,154)		(3,926)
Net investment income	$	192,192	$	150,287	$	102,335

Schedule of Realized Gain (Loss)

The following table presents realized investment gains and losses:


	Year Ended December 31,
	2025		2024		2023
	(in thousands)
Fixed-maturity securities:
Realized gains	$	8,506	$	1,151	$	1,852
Realized losses	(4,673)		(1,131)		(2,374)
Net realized gains (losses) from fixed-maturity securities	3,833		20		(522)

Equity securities:
Realized gains	2,465		7,271		7,678
Realized losses	(1,910)		(455)		(5,329)
Net realized gains from equity securities	555		6,816		2,349

Realized gains (losses) from the sales of short-term investments	2		—		(37)
Realized (losses) gains on sale of real estate investments	—		(5)		4,250
Net realized investment gains	$	4,390	$	6,831	$	6,040

The net realized gains or losses on sales of equity securities represent the total gains or losses from the purchase dates of the equity securities. The change in unrealized gains (losses) in the consolidated statement of income consists of two components: (1) the reversal of the gain or loss recognized in previous periods on equity securities sold and (2) the change in unrealized gain or loss resulting from mark-to-market adjustments on equity securities still held.

Fair value measurements (Tables)

12 Months Ended

Dec. 31, 2025

Fair Value Disclosures [Abstract]

Assets Measured at Fair Value on a Recurring Basis

The following tables present the balances of assets measured at fair value on a recurring basis as of December 31, 2025 and 2024, by level within the fair value hierarchy:


	December 31, 2025
	Level 1		Level 2		Level 3		Total
	(in thousands)
Assets
Fixed maturities:
U.S. Treasury securities and obligations of U.S. government agencies	$	874	$	—	$	—	$	874
Obligations of states, municipalities and political subdivisions	—		127,860		—		127,860
Corporate and other securities	—		1,713,888		—		1,713,888
Asset-backed securities	—		588,519		—		588,519
Residential mortgage-backed securities	—		1,459,270		—		1,459,270
Commercial mortgage-backed securities	—		451,039		—		451,039
Total fixed maturities	874		4,340,576		—		4,341,450

Equity securities:
Exchange traded funds	185,523		—		—		185,523
Non-redeemable preferred stock	—		24,100		—		24,100
Common stocks	416,776		—		—		416,776
Total equity securities	602,299		24,100		—		626,399
Short-term investments	3,864		—		—		3,864
Total	$	607,037	$	4,364,676	$	—	$	4,971,713


	December 31, 2024
	Level 1		Level 2		Level 3		Total
	(in thousands)
Assets
Fixed maturities:
U.S. Treasury securities and obligations of U.S. government agencies	$	15,048	$	—	$	—	$	15,048
Obligations of states, municipalities and political subdivisions	—		146,304		—		146,304
Corporate and other securities	—		1,989,490		—		1,989,490
Asset-backed securities	—		732,742		—		732,742
Residential mortgage-backed securities	—		448,874		—		448,874
Commercial mortgage-backed securities	—		205,105		—		205,105
Total fixed maturities	15,048		3,522,515		—		3,537,563

Equity securities:
Exchange traded funds	129,731		—		—		129,731
Non-redeemable preferred stock	—		26,433		—		26,433
Common stocks	242,195		—		—		242,195
Total equity securities	371,926		26,433		—		398,359
Short-term investments	3,714		—		—		3,714
Total	$	390,688	$	3,548,948	$	—	$	3,939,636

Deferred policy acquisition costs (Tables)

12 Months Ended

Dec. 31, 2025

Deferred Policy Acquisition Costs Disclosures [Abstract]

Deferred Policy Acquisition Costs

The following table presents the amounts of policy acquisition costs deferred and amortized for the years ended:


	Year Ended December 31,
	2025		2024		2023
	(in thousands)
Balance, beginning of year	$	109,263	$	88,395	$	61,594
Policy acquisition costs deferred:
Direct commissions	291,851		274,124		227,755
Ceding commissions	(116,592)		(120,459)		(88,449)
Other underwriting and policy acquisition costs	16,805		14,215		10,982
Policy acquisition costs deferred	192,064		167,880		150,288
Amortization of net policy acquisition costs	(182,590)		(147,012)		(123,487)
Balance, end of year	$	118,737	$	109,263	$	88,395

Underwriting, acquisition and insurance expenses (Tables)

12 Months Ended

Dec. 31, 2025

Underwriting, Acquisition and Insurance Expenses [Abstract]

Underwriting, Acquisition and Insurance Expenses

Underwriting, acquisition and insurance expenses consist of the following:


	Year Ended December 31,
	2025		2024		2023
	(in thousands)
Underwriting, acquisition and insurance expenses incurred:
Direct commissions	$	286,268	$	254,523	$	198,715
Ceding commissions	(119,466)		(120,339)		(84,998)
Other underwriting expenses	169,894		151,624		115,253
Total	$	336,696	$	285,808	$	228,970

Income taxes (Tables)

12 Months Ended

Dec. 31, 2025

Income Tax Disclosure [Abstract]

Schedule of Income before Income Tax, Domestic and Foreign

For the years ending December 31, 2025, 2024 and 2023, income before income tax expense includes the following components:


	Year Ended December 31,
	2025		2024		2023
	(in thousands)
Income from continuing operations before income tax expense
U.S.	$	634,302	$	514,716	$	384,017

Total	$	634,302	$	514,716	$	384,017

Components of Income Tax Expense (Benefit)

For the years ending December 31, 2025, 2024 and 2023, income tax expense (benefit) from continuing operations consisted of:


	Year Ended December 31,
	2025		2024		2023
	(in thousands)
Income tax expense (benefit) from continuing operations
Current tax expense
U.S. federal	$	130,345	$	103,701	$	85,353
U.S. state and local	—		—		—

Total current tax expense	130,345		103,701		85,353

Deferred tax expense (benefit)
U.S. federal	343		(3,828)		(9,429)
U.S. state and local	—		—		—

Total deferred tax expense (benefit)	343		(3,828)		(9,429)





Total income tax expense	$	130,688	$	99,873	$	75,924

Effective Income Tax Rate Reconciliation

The reconciliation of the statutory U.S. federal income tax rate to the Company’s effective tax rate for the years ending December 31, 2025, 2024 and 2023 is as follows:


	Year Ended December 31,
	2025				2024				2023
	(in thousands)
	Amount		Percent		Amount		Percent		Amount		Percent
U.S. federal statutory income tax rate	$	133,203	21.0	%	$	108,090	21.0	%	$	80,644	21.0	%

U.S. federal
Tax credits	(500)		(0.1)	%	—		—	%	—		—	%
Nontaxable and nondeductible items	2,885		0.5	%	1,902		0.4	%	212		0.1	%


Excess tax benefits on share-based payments	(4,900)		(0.8)	%	(10,119)		(2.0)	%	(4,932)		(1.3)	%





Total	$	130,688	20.6	%	$	99,873	19.4	%	$	75,924	19.8	%

Deferred Tax Assets and Liabilities

The significant components of the net deferred tax asset are summarized as follows:


	December 31,
	2025		2024
	(in thousands)
Deferred tax assets:
Unrealized losses on fixed-maturity securities	$	8,662	$	26,343
Unpaid losses and loss adjustment expenses	49,288		36,491
Unearned premiums	34,267		32,580
State operating loss carryforwards	10,216		8,859
Stock compensation	3,158		3,276
Allowance for credit losses	5,742		5,210
Other	2,145		1,939
Deferred tax assets before allowance	113,478		114,698
Less: valuation allowance	(10,119)		(9,066)
Total deferred tax assets	103,359		105,632

Deferred tax liabilities:

Unrealized gains on equity securities	30,129		17,774
Deferred policy acquisition costs, net of ceding commissions	24,935		22,945
Property and equipment	4,894		3,263


Other	1,210		1,435
Total deferred tax liabilities	61,168		45,417
Net deferred tax asset	$	42,191	$	60,215

Reserves for unpaid losses and loss adjustment expenses (Tables)

12 Months Ended

Dec. 31, 2025

Liability for Unpaid Claims and Claims Adjustment Expense, Activity in Liability [Abstract]

Unpaid Losses and Loss Adjustment Expenses

The following table presents a reconciliation of consolidated beginning and ending reserves for unpaid losses and loss adjustment expenses:


	December 31,
	2025		2024		2023
	(in thousands)
Gross reserves for unpaid losses and loss adjustment expenses, beginning of year	$	2,285,668	$	1,692,875	$	1,238,402
Less: reinsurance recoverable on unpaid losses	323,060		241,357		177,039

Net reserves for unpaid losses and loss adjustment expenses, beginning of year	1,962,608		1,451,518		1,061,363
Incurred losses and loss adjustment expenses:
Current year	953,510		810,554		635,993
Prior years	(62,817)		(37,655)		(35,774)
Total net losses and loss adjustment expenses incurred	890,693		772,899		600,219
Payments:
Current year	64,288		49,747		38,565
Prior years	279,499		212,062		171,499
Total payments	343,787		261,809		210,064
Net reserves for unpaid losses and loss adjustment expenses, end of year	2,509,514		1,962,608		1,451,518
Reinsurance recoverable on unpaid losses, net of allowance	381,356		323,060		241,357
Gross reserves for unpaid losses and loss adjustment expenses, end of year	$	2,890,870	$	2,285,668	$	1,692,875

Claims Development

Short-duration Insurance Contracts, Reconciliation of Claims Development to Liability

The reconciliation of the net incurred and paid claims development tables to the liability for unpaid claims and claim adjustment expenses in the consolidated statement of financial position is as follows:


(in thousands)	December 31, 2025
Net outstanding liabilities
Property	$	142,369
Casualty - claims made	325,593
Casualty - occurrence	1,789,318
Liabilities for unpaid claims and claim adjustment expenses, net of reinsurance	2,257,280

Reinsurance recoverable on unpaid claims
Property	112,836
Casualty - claims made	22,702
Casualty - occurrence	246,890
Allowance for credit losses	(1,072)
Total reinsurance recoverable on unpaid claims	381,356
Unallocated claims adjustment expenses	251,162
Allowance for credit losses	1,072
Gross liability for unpaid claims and claim adjustment expense	$	2,890,870

Property [Member]

Claims Development

Short-duration Insurance Contracts, Claims Development

Property


	Incurred Claims and Claim Adjustment Expenses, Net of Reinsurance
	For the Years Ended December 31,										December 31, 2025
Accident Year	2021 Unaudited		2022 Unaudited		2023 Unaudited		2024 Unaudited		2025		Total of IBNR Liabilities Plus Expected Development on Reported Claims		Cumulative Number of Reported Claims
	($ in thousands)
2021	$	36,531	$	33,518	$	29,750	$	31,392	$	30,340	$	—	1,148
2022			67,127		53,676		53,527		52,311		2,917		2,349
2023					75,517		54,503		43,569		12,150		999
2024							112,051		83,016		26,458		1,483
2025									129,580		75,567		917
							Total		$	338,816


	Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance
	For the Years Ended December 31,
Accident Year	2021 Unaudited		2022 Unaudited		2023 Unaudited		2024 Unaudited		2025
	($ in thousands)
2021	$	14,268	$	21,257	$	27,324	$	30,200	$	30,332
2022			33,004		46,965		48,030		48,784
2023					20,267		26,434		28,734
2024							31,303		46,611
2025									42,491
							Total		196,952
			All outstanding liabilities before 2021, net of reinsurance						505
			Liabilities for claims and claim adjustment expenses, net of reinsurance						$	142,369

Short-duration Insurance Contracts, Schedule of Historical Claims Duration

The following is supplementary information about average historical claims duration as of December 31, 2025:


Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance
	(Unaudited)
Years	1		2		3		4		5
Property	45.4	%	20.6	%	9.1	%	5.5	%	0.4	%

Casualty - claims made [Member]

Claims Development

Short-duration Insurance Contracts, Claims Development

Casualty - Claims Made


	Incurred Claims and Claim Adjustment Expenses, Net of Reinsurance
	For the Years Ended December 31,																				December 31, 2025
Accident Year	2016 Unaudited		2017 Unaudited		2018 Unaudited		2019 Unaudited		2020 Unaudited		2021 Unaudited		2022 Unaudited		2023 Unaudited		2024 Unaudited		2025		Total of IBNR Liabilities Plus Expected Development on Reported Claims		Cumulative Number of Reported Claims
	($ in thousands)
2016	$	19,170	$	14,693	$	14,675	$	14,322	$	13,583	$	13,602	$	13,228	$	12,707	$	12,703	$	12,701	$	10	314
2017			18,116		17,097		16,120		15,794		14,989		13,698		13,471		12,840		12,836		35		372
2018					22,429		20,234		18,612		17,057		14,411		14,272		14,186		14,789		562		467
2019							34,693		29,056		26,426		24,489		21,788		22,839		22,615		1,314		567
2020									55,630		44,641		38,287		33,667		28,877		26,257		2,689		789
2021											84,018		66,191		52,935		36,710		32,389		11,658		1,091
2022													101,064		81,394		60,873		56,758		21,721		1,251
2023															115,858		91,516		83,123		43,710		1,498
2024																	123,511		113,003		76,532		1,610
2025																			140,071		122,573		1,629
																	Total		$	514,542


	Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance
	For the Years Ended December 31,
Accident Year	2016 Unaudited		2017 Unaudited		2018 Unaudited		2019 Unaudited		2020 Unaudited		2021 Unaudited		2022 Unaudited		2023 Unaudited		2024 Unaudited		2025
	($ in thousands)
2016	$	1,158	$	3,015	$	6,907	$	9,839	$	11,381	$	12,105	$	12,299	$	12,691	$	12,691	$	12,691
2017			340		4,897		8,252		10,484		11,357		12,235		12,335		12,779		12,792
2018					507		5,030		8,931		10,330		11,205		12,623		13,247		13,329
2019							2,487		6,005		10,123		14,476		15,406		16,598		19,010
2020									1,002		7,446		12,551		18,589		22,445		23,356
2021											1,146		8,437		12,895		16,294		19,634
2022													3,052		12,381		24,033		28,758
2023															4,830		16,895		31,206
2024																	6,755		23,330
2025																			4,864
																	Total		188,970
	All outstanding liabilities before 2016, net of reinsurance																		21
	Liabilities for claims and claim adjustment expenses, net of reinsurance																		$	325,593

Casualty - occurrence [Member]

Claims Development

Short-duration Insurance Contracts, Claims Development

Casualty - Occurrence


	Incurred Claims and Claim Adjustment Expenses, Net of Reinsurance
	For the Years Ended December 31,																				December 31, 2025
Accident Year	2016 Unaudited		2017 Unaudited		2018 Unaudited		2019 Unaudited		2020 Unaudited		2021 Unaudited		2022 Unaudited		2023 Unaudited		2024 Unaudited		2025		Total of IBNR Liabilities Plus Expected Development on Reported Claims		Cumulative Number of Reported Claims
	($ in thousands)
2016	$	61,440	$	55,680	$	53,549	$	55,534	$	57,401	$	60,861	$	64,612	$	65,323	$	65,025	$	65,469	$	4,441	1,715
2017			71,126		67,151		68,985		70,641		71,117		69,911		76,715		79,203		81,696		7,158		2,344
2018					86,157		78,331		78,386		83,952		93,215		97,005		101,939		103,208		10,494		2,710
2019							112,266		109,994		108,138		107,480		115,681		120,003		124,190		19,181		2,708
2020									154,619		136,212		131,082		135,045		140,203		142,565		53,064		3,451
2021											200,598		190,879		193,722		204,787		206,475		105,695		3,542
2022													272,692		271,399		287,977		292,377		162,331		4,350
2023															372,245		372,413		379,978		279,930		4,792
2024																	490,719		489,026		430,927		4,329
2025																			581,722		559,623		2,959
																	Total		$	2,466,706


	Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance
	For the Years Ended December 31,
Accident Year	2016 Unaudited		2017 Unaudited		2018 Unaudited		2019 Unaudited		2020 Unaudited		2021 Unaudited		2022 Unaudited		2023 Unaudited		2024 Unaudited		2025
	($ in thousands)
2016	$	1,099	$	6,015	$	17,225	$	28,924	$	34,437	$	43,311	$	51,533	$	55,595	$	57,421	$	60,165
2017			1,581		9,352		22,407		37,736		46,025		52,069		61,108		66,435		70,258
2018					2,638		10,995		22,860		35,138		54,441		72,174		82,927		88,652
2019							3,944		16,687		30,518		46,478		69,384		84,496		98,239
2020									2,400		8,673		17,805		32,606		55,548		78,929
2021											3,205		12,944		31,494		57,465		84,691
2022													4,658		23,084		56,201		103,263
2023															4,329		21,930		65,628
2024																	6,032		31,578
2025																			5,078
																	Total		686,481
					All outstanding liabilities before 2016, net of reinsurance														9,093
			Liabilities for claims and claim adjustment expenses, net of reinsurance																$	1,789,318

Casualty [Member]

Claims Development

Short-duration Insurance Contracts, Schedule of Historical Claims Duration

The following is supplementary information about average historical claims duration as of December 31, 2025:


	Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance
	(Unaudited)
Years	1		2		3		4		5		6		7		8		9		10
Casualty - claims made	5.4	%	21.0	%	21.5	%	15.9	%	9.0	%	6.2	%	4.3	%	2.4	%	0.1	%	—	%
Casualty - occurrence	1.7	%	6.7	%	11.7	%	14.3	%	14.2	%	13.3	%	11.3	%	6.1	%	3.7	%	4.2	%

Reinsurance (Tables)

12 Months Ended

Dec. 31, 2025

Reinsurance Disclosures [Abstract]

Effects of Reinsurance on Premiums Written and Earned

The following table summarizes the effect of reinsurance on premiums written and earned:


	Year Ended December 31,
	2025		2024		2023
	(in thousands)
Written:
Direct	$	1,977,171	$	1,870,341	$	1,568,815

Ceded	(361,154)		(392,993)		(304,185)
Net written	$	1,616,017	$	1,477,348	$	1,264,630

Earned:
Direct	$	1,945,225	$	1,743,243	$	1,367,141

Ceded	(369,383)		(392,773)		(294,604)
Net earned	$	1,575,842	$	1,350,470	$	1,072,537

Reinsurance Recoverables

The following table presents reinsurance recoverables on paid and unpaid losses as of December 31, 2025 and 2024:


	December 31, 2025		December 31, 2024
	(in thousands)
Reinsurance recoverables on paid losses	$	12,973	$	14,831
Reinsurance recoverables on unpaid losses	381,356		323,060
Reinsurance recoverables	$	394,329	$	337,891

Stockholders' Equity (Tables)

12 Months Ended

Dec. 31, 2025

Equity, Attributable to Parent [Abstract]

Share-based Compensation, Stock Options, Activity

A summary of option activity as of December 31, 2025 and changes during the year then ended is presented below:


	Number of Shares	Weighted-average exercise price		Weighted-average remaining years of contractual life	Aggregate intrinsic value (in thousands)
Outstanding at December 31, 2024	118,468	$	16.00
Granted	—	—
Forfeited	—	—
Exercised	(42,554)	16.00
Outstanding at December 31, 2025	75,914	$	16.00	0.6	$	28,477
Exercisable at December 31, 2025	75,914	$	16.00	0.6	$	28,477

Nonvested Restricted Stock Shares Activity

A summary of restricted stock activity under the equity compensation plans for the year ended is as follows:


	December 31, 2025
	Number of Shares	Weighted Average Grant Date Fair Value per Share
Nonvested outstanding at the beginning of the period	110,123	$	366.73
Granted	59,963	$	433.62
Vested	(43,685)	$	322.04
Forfeited	(2,351)	$	390.17
Nonvested outstanding at the end of the period	124,050	$	414.36

Earnings per share (Tables)

12 Months Ended

Dec. 31, 2025

Earnings Per Share [Abstract]

Earnings Per Share

The following table represents a reconciliation of the numerator and denominator of the basic and diluted earnings per share computations contained in the consolidated financial statements:


	Year ended December 31,
	2025		2024		2023
	(in thousands, except per share data)
Net income	$	503,614	$	414,843	$	308,093

Weighted average common shares outstanding - basic	23,140		23,153		23,045
Dilutive effect of shares issued under stock compensation arrangements:
Stock options	89		136		214
Restricted stock awards	30		43		48
Total dilutive effect of shares issued under stock compensation arrangements	119		179		262
Weighted average common shares outstanding - diluted	23,259		23,332		23,307

Earnings per common share:
Basic	$	21.76	$	17.92	$	13.37
Diluted	$	21.65	$	17.78	$	13.22

Debt (Tables)

12 Months Ended

Dec. 31, 2025

Debt Disclosure [Abstract]

Schedule of Maturities of Long-Term Debt

The following table summarizes the future principal payments on outstanding debt as of December 31, 2025:


Years Ending December 31,	Senior Notes		Credit Facility		Total
	(in thousands)
2026	$	—	$	—	$	—
2027	—		51,000		51,000
2028	—		—		—
2029	—		—		—
2030	35,000		—		35,000
2031 and thereafter	140,000		—		140,000
Total principal payments	$	175,000	$	51,000	$	226,000

Other comprehensive income (loss) (Tables)

12 Months Ended

Dec. 31, 2025

Other Comprehensive Income (Loss), Net of Tax [Abstract]

Other Comprehensive Income (Loss)

The following table summarizes the components of other comprehensive income (loss):


	Year Ending December 31,
	2025		2024		2023
	(in thousands)
Unrealized gains (losses) on fixed-maturity securities arising during the period, before income taxes:	$	86,490	$	(2,921)	$	49,384
Income tax (expense) benefit	(18,163)		613		(10,371)
Unrealized gains (losses) arising during the period, net of income taxes	68,327		(2,308)		39,013
Less reclassification adjustment:
Net realized investment gains (losses) on available-for-sale investments	2,297		(170)		(1,443)
Income tax (expense) benefit	(482)		36		303
Reclassification adjustment included in net income	1,815		(134)		(1,140)
Change in allowance for credit losses on investments, before income taxes	(2)		526		(187)
Income tax (expense) benefit	—		(111)		39
Reclassification adjustment included in net income	(2)		415		(148)
Other comprehensive income (loss)	$	66,514	$	(2,589)	$	40,301

Segment Reporting (Tables)

12 Months Ended

Dec. 31, 2025

Segment Reporting [Abstract]

Schedule of Segment Reporting Information, by Segment


	Year Ended December 31,
	2025		2024		2023
	(in thousands)
Revenues:
Net earned premiums	$	1,575,842	$	1,350,470	$	1,072,537
Fee income	40,714		34,118		27,026
Net investment income	192,192		150,287		102,335
Change in fair value of equity securities	58,836		43,367		15,277
Net realized investment gains	4,390		6,831		6,040
Change in allowance for credit losses on investments	(2)		526		(187)
Other income (1)	2,015		1,926		1,421
Total revenues	1,873,987		1,587,525		1,224,449
Expenses:
Losses and loss adjustment expenses - current year	923,160		785,036		631,407
Losses and loss adjustment expenses - catastrophes	30,350		25,518		4,586
Losses and loss adjustment expenses - prior year development	(62,817)		(37,655)		(35,774)
Net commissions incurred	166,802		134,184		113,717
Salaries, employee benefits and bonus expense	128,917		109,319		85,689
Credit loss expense - premiums receivable	10,503		17,397		9,790
Depreciation (2)	4,777		4,686		2,655
Interest expense	10,646		10,134		10,301
Other segment items (3)	27,347		24,190		18,061
Income tax expense	130,688		99,873		75,924
Segment net income	503,614		414,843		308,093
Reconciliation of profit or loss:
Adjustments and reconciling items	—		—		—
Consolidated net income	$	503,614	$	414,843	$	308,093

(1) Other income primarily includes income generated from the Company's real estate operations.

(2) Excludes depreciation expense allocated to loss adjustment expenses and investment expenses

(3) Other segment items primarily includes other general and administrative expenses such as technology costs, facility expenses and audit and inspection costs.

Underwriting information (Tables)

12 Months Ended

Dec. 31, 2025

Segment Reporting [Abstract]

Gross Written Premiums by Underwriting Division

Gross written premiums by underwriting division are presented below:


	Year Ended December 31,
	2025		2024		2023
	(in thousands)
Commercial:
Commercial Property	$	374,451	$	456,170	$	411,956
Excess Casualty	276,998		245,137		194,049
General Casualty	207,888		169,162		118,745
Small Business Casualty	202,412		195,593		174,080
Construction	147,601		148,558		137,902
Small Business Property	102,413		76,800		43,893
Allied Health	96,982		83,058		67,808
Entertainment	70,049		55,168		36,566
Products Liability	67,883		67,035		61,786
Commercial Auto	48,721		35,047		19,050
Energy	46,102		42,710		38,637
Excess Professional	41,453		32,633		24,033
Life Sciences	35,284		36,252		41,379
Inland Marine	33,525		27,184		18,669
Professional Liability	33,091		35,104		36,087
Environmental	31,559		30,372		25,938
Health Care	25,821		23,179		20,378
Management Liability	18,582		21,705		26,617
Public Entity	18,121		20,047		20,027
Agribusiness - Casualty	13,671		5,850		2,309
Aviation	9,659		8,591		6,453
Agribusiness - Property	8,669		—		—
Ocean Marine	3,761		3,655		2,339
Product Recall	2,686		2,397		1,637

Total commercial	1,917,382		1,821,407		1,530,338
Personal:
High Value Homeowners	36,062		26,844		14,295
Personal Insurance	23,727		22,090		24,182
Total personal	59,789		48,934		38,477
Total	$	1,977,171	$	1,870,341	$	1,568,815

Statutory financial information (Tables)

12 Months Ended

Dec. 31, 2025

Statutory Accounting Practices, Statutory Amount Available for Dividend Payments [Abstract]

Statutory Net Income and Statutory Capital and Surplus

Statutory net income and statutory capital and surplus for Kinsale Insurance as of December 31, 2025, 2024, and 2023 and for the years then ended are summarized as follows:


	Year ended December 31,
	2025		2024		2023
	(in thousands)
Statutory net income	$	447,965	$	357,896	$	259,042
Statutory capital and surplus	$	1,933,169	$	1,525,851	$	1,167,382

- Definition

Tabular disclosure of how the entity's reporting under GAAP as of the balance sheet date differs from the results based on prescribed and permitted accounting practices of the state or country of domicile in which a relevant statutory filing is made, or differences in results based on the National Association of Insurance Commissioners (NAIC) prescribed practices, or a combination thereof. Describes the accounting practices used and the related monetary effect on statutory surplus, net income, and risk-based capital. If an insurance enterprise's risk-based capital would have triggered a regulatory event had it not used a permitted practice, that fact is disclosed in the financial statements. Permitted statutory accounting practices include practices not prescribed but allowed by the domiciliary state insurance department regulatory authority.

+ References + Details

Schedule II - Condensed Financial Information of Registrant (Tables)

12 Months Ended

Dec. 31, 2025

Condensed Financial Information Disclosure [Abstract]

Condensed Balance Sheet


	December 31,
	2025		2024
	(in thousands)
Assets
Cash and cash equivalents	$	49,969	$	12,336
Due from subsidiaries	33,941		52,296
Investment in subsidiaries	2,103,519		1,604,811
Deferred income tax asset, net	2,388		2,527

Other assets	648		664
Total assets	$	2,190,465	$	1,672,634

Liabilities and Stockholders' Equity
Liabilities:
Accounts payable and accrued expenses	$	2,752	$	2,001

Income taxes payable	3,603		2,842
Debt	224,397		184,122
Other liabilities	130		108
Total liabilities	230,882		189,073

Stockholders’ equity:


Common stock	234		233
Additional paid-in capital	373,681		361,398
Retained earnings	1,716,945		1,229,136
Accumulated other comprehensive loss	(30,692)		(97,206)
Treasury stock, at cost	(100,585)		(10,000)
Stockholders’ equity	1,959,583		1,483,561
Total liabilities and stockholders’ equity	$	2,190,465	$	1,672,634

Condensed Income Statement


	Years Ended December 31,
	2025		2024		2023
	(in thousands)
Revenues:
Management fees from subsidiaries	$	20,822	$	16,769	$	11,918
Net investment income	1,186		641		—

Total revenues	22,008		17,410		11,918

Expenses:
Operating expenses	21,938		17,193		13,007
Interest expense	10,646		10,134		10,301
Other expenses	—		615		—
Total expenses	32,584		27,942		23,308
Loss before income taxes	(10,576)		(10,532)		(11,390)
Income tax benefit	(6,996)		(12,346)		(7,324)
(Loss) income before equity in net income of subsidiaries	(3,580)		1,814		(4,066)
Equity in undistributed earnings of subsidiaries	507,194		413,029		312,159
Net income	503,614		414,843		308,093

Other comprehensive income (loss):
Equity in other comprehensive income (losses) of subsidiaries	66,514		(2,589)		40,301
Total comprehensive income	$	570,128	$	412,254	$	348,394

Condensed Cash Flow Statement


	Years Ended December 31,
	2025		2024		2023
	(in thousands)
Operating activities
Net income	$	503,614	$	414,843	$	308,093
Adjustments to reconcile net income to net cash provided by (used in) operating activities:
Deferred tax expense (benefit)	139		(854)		(372)
Stock compensation expense	17,884		14,146		9,361
Equity in undistributed earnings of subsidiaries	(507,194)		(413,029)		(312,159)
Changes in operating assets and liabilities	18,645		(25,795)		55,893
Current taxes payable	761		(359)		—
Change in accounts payable and accrued expenses	164		(41)		—
Dividends received from subsidiary	105,000		47,000		—
Net cash provided by operating activities	139,013		35,911		60,816

Investing activities

Contributions to subsidiary	(30,000)		(11,000)		(50,000)
Net cash used in investing activities	(30,000)		(11,000)		(50,000)

Financing activities

Proceeds from credit facility	40,000		—		—
Proceeds from notes payable	—		—		50,000
Repayment of credit facility	—		—		(62,000)
Debt issuance costs	—		—		(164)
Payroll taxes withheld and remitted on share-based payments	(6,281)		(7,047)		(4,282)
Common stock issued, stock options exercised	681		1,330		877
Dividends paid	(15,782)		(13,940)		(12,954)
Treasury stock acquired — share repurchases	(89,998)		(10,000)		—

Net cash used in financing activities	(71,380)		(29,657)		(28,523)
Net change in cash and cash equivalents	37,633		(4,746)		(17,707)
Cash and cash equivalents at beginning of year	12,336		17,082		34,789
Cash and cash equivalents at end of year	$	49,969	$	12,336	$	17,082

Description of business - (Details)	Dec. 31, 2025
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Number of states in which company is authorized to write business	50

Summary of significant accounting policies (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024
Accounting Policies [Abstract]
Premium Receivable, Allowance for Credit Loss, Beginning Balance	$ 26,926	$ 13,383
Premium Receivable, Credit Loss Expense (Reversal)	10,503	17,397
Premium Receivable, Allowance for Credit Loss, Writeoff	(10,101)	(3,854)
Premium Receivable, Allowance for Credit Loss	$ 27,328	$ 26,926

Intangible assets and other information (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Excess and surplus lines insurance authorization [Member]
Indefinite-lived Intangible Assets [Line Items]
Impairment of intangible assets	$ 0.0	$ 0.0	$ 0.0

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Topic 805
-SubTopic 20
-Name Accounting Standards Codification
-Section 55
-Paragraph 38
-Subparagraph (e)
-Publisher FASB
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Reference 2: http://www.xbrl.org/2003/role/exampleRef
-Topic 805
-SubTopic 20
-Name Accounting Standards Codification
-Section 55
-Paragraph 31
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479876/805-20-55-31

Reference 3: http://www.xbrl.org/2003/role/exampleRef
-Topic 805
-SubTopic 20
-Name Accounting Standards Codification
-Section 55
-Paragraph 31
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-URI https://asc.fasb.org/1943274/2147479876/805-20-55-31

Reference 4: http://www.xbrl.org/2003/role/exampleRef
-Topic 805
-SubTopic 20
-Name Accounting Standards Codification
-Section 55
-Paragraph 14
-Subparagraph (b)
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Reference 5: http://www.xbrl.org/2003/role/exampleRef
-Topic 805
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-Paragraph 14
-Subparagraph (a)
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-URI https://asc.fasb.org/1943274/2147479876/805-20-55-14

Reference 6: http://www.xbrl.org/2003/role/exampleRef
-Topic 805
-SubTopic 20
-Name Accounting Standards Codification
-Section 55
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-URI https://asc.fasb.org/1943274/2147479876/805-20-55-14

Reference 7: http://www.xbrl.org/2003/role/exampleRef
-Name Accounting Standards Codification
-Section 55
-Paragraph 40
-SubTopic 30
-Topic 350
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482640/350-30-55-40

Reference 8: http://www.xbrl.org/2003/role/disclosureRef
-Topic 350
-SubTopic 30
-Name Accounting Standards Codification
-Section 45
-Paragraph 1
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-URI https://asc.fasb.org/1943274/2147482686/350-30-45-1

Reference 9: http://www.xbrl.org/2003/role/disclosureRef
-Topic 350
-SubTopic 30
-Name Accounting Standards Codification
-Section 50
-Paragraph 3
-Subparagraph (d)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482665/350-30-50-3

Reference 10: http://www.xbrl.org/2003/role/disclosureRef
-Topic 350
-SubTopic 30
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482665/350-30-50-2

+ Details

Summary of significant accounting policies Property and Equipment (Details) - USD ($) $ in Thousands	Dec. 31, 2025	Dec. 31, 2024
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Gross	$ 105,936	$ 100,291
Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment	(16,505)	(17,367)
Property, Plant and Equipment, Net	89,431	82,924
Building [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Gross	$ 66,763	37,190
Building [Member] \| Maximum [Member]
Property, Plant and Equipment [Line Items]
Estimated useful life	39 years
Parking [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Gross	$ 0	5,072
Land [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Gross	0	3,068
Equipment [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Gross	5,375	4,401
Software Development [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Gross	27,136	20,203
Furniture and Fixtures [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Gross	$ 6,157	3,200
Furniture and Fixtures [Member] \| Minimum [Member]
Property, Plant and Equipment [Line Items]
Estimated useful life	7 years
Furniture and Fixtures [Member] \| Maximum [Member]
Property, Plant and Equipment [Line Items]
Estimated useful life	10 years
Leasehold Improvements [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Gross	$ 0	153
Land Improvements [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Gross	$ 129	474
Land Improvements [Member] \| Minimum [Member]
Property, Plant and Equipment [Line Items]
Estimated useful life	15 years
Land Improvements [Member] \| Maximum [Member]
Property, Plant and Equipment [Line Items]
Estimated useful life	20 years
Technology Equipment [Member] \| Minimum [Member]
Property, Plant and Equipment [Line Items]
Estimated useful life	3 years
Technology Equipment [Member] \| Maximum [Member]
Property, Plant and Equipment [Line Items]
Estimated useful life	7 years
Construction in Progress [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Gross	$ 376	$ 26,530

Investments, Available-for-sale Investments (Details) - USD ($) $ in Thousands	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Debt Securities, Available-for-sale [Line Items]
Total fixed maturities, Amortized Cost	$ 4,382,725	$ 3,663,031
Gross Unrealized Gains	45,250	11,601
Gross Unrealized Losses	86,496	137,042
Debt Securities, Available-for-Sale, Allowance for Credit Loss, Excluding Accrued Interest	(29)	(27)	$ (553)
Estimated Fair Value	4,341,450	3,537,563
U.S. Treasury Securities and Obligations of U.S. Government Agencies [Member]
Debt Securities, Available-for-sale [Line Items]
Total fixed maturities, Amortized Cost	861	15,465
Gross Unrealized Gains	14	0
Gross Unrealized Losses	1	417
Debt Securities, Available-for-Sale, Allowance for Credit Loss, Excluding Accrued Interest	0	0
Estimated Fair Value	874	15,048
Obligations of states, municipalities and political subdivisions [Member]
Debt Securities, Available-for-sale [Line Items]
Total fixed maturities, Amortized Cost	146,222	168,894
Gross Unrealized Gains	51	46
Gross Unrealized Losses	18,410	22,633
Debt Securities, Available-for-Sale, Allowance for Credit Loss, Excluding Accrued Interest	(3)	(3)
Estimated Fair Value	127,860	146,304
Corporate and other securities [Member]
Debt Securities, Available-for-sale [Line Items]
Total fixed maturities, Amortized Cost	1,711,348	2,037,372
Gross Unrealized Gains	28,798	5,779
Gross Unrealized Losses	26,232	53,638
Debt Securities, Available-for-Sale, Allowance for Credit Loss, Excluding Accrued Interest	(26)	(23)
Estimated Fair Value	1,713,888	1,989,490
Asset-backed securities [Member]
Debt Securities, Available-for-sale [Line Items]
Total fixed maturities, Amortized Cost	582,780	729,658
Gross Unrealized Gains	6,377	4,606
Gross Unrealized Losses	638	1,522
Debt Securities, Available-for-Sale, Allowance for Credit Loss, Excluding Accrued Interest	0	0
Estimated Fair Value	588,519	732,742
Residential mortgage-backed securities [Member]
Debt Securities, Available-for-sale [Line Items]
Total fixed maturities, Amortized Cost	1,491,642	502,121
Gross Unrealized Gains	6,378	747
Gross Unrealized Losses	38,750	53,994
Debt Securities, Available-for-Sale, Allowance for Credit Loss, Excluding Accrued Interest	0	0
Estimated Fair Value	1,459,270	448,874
Commercial mortgage-backed aecurities [Member]
Debt Securities, Available-for-sale [Line Items]
Total fixed maturities, Amortized Cost	449,872	209,521
Gross Unrealized Gains	3,632	423
Gross Unrealized Losses	2,465	4,838
Debt Securities, Available-for-Sale, Allowance for Credit Loss, Excluding Accrued Interest	0	(1)
Estimated Fair Value	$ 451,039	$ 205,105

Investments, Available-for-sale Securities in a Loss Position (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2025 USD ($) security Rate	Dec. 31, 2024 USD ($)	Dec. 31, 2023 USD ($)
Debt Securities, Available-for-sale [Line Items]
Less than 12 Months, Estimated Fair Value	$ 686,671	$ 1,053,882
Less than 12 months, Gross Unrealized Losses	2,059	13,406
12 Months or Longer, Estimated Fair Value	637,608	938,410
12 Months or Longer, Gross Unrealized Losses	84,437	123,636
Total Estimated Fair Value	1,324,279	1,992,292
Total gross unrealized losses	(86,496)	(137,042)
Debt Securities, Available-for-Sale, Unrealized Loss Position	$ 1,324,279	1,992,292
Number of available-for-sale securities in unrealized loss positions	592
Number of available-for-sale securities in unrealized loss positions, greater than one year	483
Debt Instrument, Covenant Description	In December 2025, the covenants limiting restricted payments under the Note Purchase Agreement and Amended and Restated Credit Agreement were amended to allow the Company to make restricted payments so long as at the time of the declaration of such restricted payment, no event of default under the Note Purchase Agreement has occurred and is continuing or would arise after giving effect, on a pro forma basis, to such restricted payment if such restricted payment were to be made at such time of declaration.
Debt Securities Available For Sale Allowance For Credit Loss Number Of Securities \| security	3,000
Debt Securities, Available-for-Sale, Excluding Accrued Interest, Allowance for Credit Loss, Not Previously Recorded	$ 0	3
Debt Securities, Available-for-Sale, Allowance for Credit Loss, Securities Sold	(14)	(479)
Debt Securities, Available-for-Sale, Allowance for Credit Loss, Period Increase (Decrease)	16	(50)
Debt Securities, Available-for-Sale, Allowance for Credit Loss, Excluding Accrued Interest	$ 29	27	$ 553
Debt Securities Available For Sale Allowance For Credit Loss Number Of Securities \| security	3,000
Fixed Maturities [Member]
Debt Securities, Available-for-sale [Line Items]
Percentage of securities rated A- or better \| Rate	81.90%
U.S. Treasury Securities and Obligations of U.S. Government Agencies [Member]
Debt Securities, Available-for-sale [Line Items]
Less than 12 Months, Estimated Fair Value	$ 296	838
Less than 12 months, Gross Unrealized Losses	1	13
12 Months or Longer, Estimated Fair Value	0	14,210
12 Months or Longer, Gross Unrealized Losses	0	404
Total Estimated Fair Value	296	15,048
Total gross unrealized losses	(1)	(417)
Debt Securities, Available-for-Sale, Unrealized Loss Position	296	15,048
Debt Securities, Available-for-Sale, Allowance for Credit Loss, Excluding Accrued Interest	0	0
Obligations of states, municipalities and political subdivisions [Member]
Debt Securities, Available-for-sale [Line Items]
Less than 12 Months, Estimated Fair Value	1,043	27,049
Less than 12 months, Gross Unrealized Losses	2	417
12 Months or Longer, Estimated Fair Value	118,027	114,620
12 Months or Longer, Gross Unrealized Losses	18,408	22,216
Total Estimated Fair Value	119,070	141,669
Total gross unrealized losses	(18,410)	(22,633)
Debt Securities, Available-for-Sale, Unrealized Loss Position	119,070	141,669
Debt Securities, Available-for-Sale, Allowance for Credit Loss, Excluding Accrued Interest	3	3
Corporate and other securities [Member]
Debt Securities, Available-for-sale [Line Items]
Less than 12 Months, Estimated Fair Value	101,385	667,645
Less than 12 months, Gross Unrealized Losses	597	9,139
12 Months or Longer, Estimated Fair Value	239,152	493,598
12 Months or Longer, Gross Unrealized Losses	25,635	44,499
Total Estimated Fair Value	340,537	1,161,243
Total gross unrealized losses	(26,232)	(53,638)
Debt Securities, Available-for-Sale, Unrealized Loss Position	340,537	1,161,243
Debt Securities, Available-for-Sale, Allowance for Credit Loss, Excluding Accrued Interest	26	23
Asset-backed securities [Member]
Debt Securities, Available-for-sale [Line Items]
Less than 12 Months, Estimated Fair Value	92,682	121,371
Less than 12 months, Gross Unrealized Losses	384	943
12 Months or Longer, Estimated Fair Value	7,759	24,656
12 Months or Longer, Gross Unrealized Losses	254	579
Total Estimated Fair Value	100,441	146,027
Total gross unrealized losses	(638)	(1,522)
Debt Securities, Available-for-Sale, Unrealized Loss Position	100,441	146,027
Debt Securities, Available-for-Sale, Allowance for Credit Loss, Excluding Accrued Interest	0	0
Residential mortgage-backed securities [Member]
Debt Securities, Available-for-sale [Line Items]
Less than 12 Months, Estimated Fair Value	387,397	144,955
Less than 12 months, Gross Unrealized Losses	779	1,934
12 Months or Longer, Estimated Fair Value	228,531	237,514
12 Months or Longer, Gross Unrealized Losses	37,971	52,060
Total Estimated Fair Value	615,928	382,469
Total gross unrealized losses	(38,750)	(53,994)
Debt Securities, Available-for-Sale, Unrealized Loss Position	615,928	382,469
Debt Securities, Available-for-Sale, Allowance for Credit Loss, Excluding Accrued Interest	0	0
Commercial mortgage-backed aecurities [Member]
Debt Securities, Available-for-sale [Line Items]
Less than 12 Months, Estimated Fair Value	103,868	92,024
Less than 12 months, Gross Unrealized Losses	296	960
12 Months or Longer, Estimated Fair Value	44,139	53,812
12 Months or Longer, Gross Unrealized Losses	2,169	3,878
Total Estimated Fair Value	148,007	145,836
Total gross unrealized losses	(2,465)	(4,838)
Debt Securities, Available-for-Sale, Unrealized Loss Position	148,007	145,836
Debt Securities, Available-for-Sale, Allowance for Credit Loss, Excluding Accrued Interest	$ 0	$ 1

Investments, Contractual Maturities of Available-for-sale Fixed Maturity Securities (Details) - USD ($) $ in Thousands	Dec. 31, 2025	Dec. 31, 2024
Amortized Cost [Abstract]
Due in one year or less, Amortized Cost	$ 14,324
Due after one year through five years, Amortized Cost	868,804
Due after five years through ten years, Amortized Cost	695,323
Due after ten years, Amortized Cost	279,980
Total fixed maturities, Amortized Cost	4,382,725	$ 3,663,031
Estimated Fair Value [Abstract]
Due in one year or less, Estimated Fair Value	14,392
Due after one year through five years, Estimated Fair Value	879,532
Due after five years through ten years, Estimated Fair Value	700,466
Due after ten years, Estimated Fair Value	248,232
Estimated Fair Value	4,341,450	3,537,563
Asset-backed securities [Member]
Amortized Cost [Abstract]
Without single maturity date, Amortized Cost	582,780
Total fixed maturities, Amortized Cost	582,780	729,658
Estimated Fair Value [Abstract]
Without single maturity date, Estimated Fair Value	588,519
Estimated Fair Value	588,519	732,742
Residential mortgage-backed securities [Member]
Amortized Cost [Abstract]
Without single maturity date, Amortized Cost	1,491,642
Total fixed maturities, Amortized Cost	1,491,642	502,121
Estimated Fair Value [Abstract]
Without single maturity date, Estimated Fair Value	1,459,270
Estimated Fair Value	1,459,270	448,874
Commercial mortgage-backed aecurities [Member]
Amortized Cost [Abstract]
Without single maturity date, Amortized Cost	449,872
Total fixed maturities, Amortized Cost	449,872	209,521
Estimated Fair Value [Abstract]
Without single maturity date, Estimated Fair Value	451,039
Estimated Fair Value	$ 451,039	$ 205,105

Investments, Net Investment Income (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Interest [Abstract]
Taxable bonds	$ 180,911	$ 143,242	$ 92,227
Municipal bonds (tax exempt)	1,390	1,592	2,217
Cash equivalents and short-term investments	6,185	3,012	3,004
Dividends on equity securities	8,602	6,442	5,097
Real estate investment income	197,088	154,441	106,261
Investment expenses	(4,896)	(4,154)	(3,926)
Net investment income	192,192	150,287	102,335
Real Estate Investment
Interest [Abstract]
Real estate investment income	0	153	3,716
Investment expenses	$ 0	$ 0	$ (500)

- Definition

Amount, after investment expense, of income earned from investments in securities and real estate. Includes, but is not limited to, real estate investment, policy loans, dividends, and interest. Excludes realized gain (loss) on investments.

+ References + Details

Investments Realized Investment Gains and Losses (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Fixed-maturity securities - realized gains (losses) [Abstract]
Realized gains	$ 8,506	$ 1,151	$ 1,852
Realized losses	(4,673)	(1,131)	(2,374)
Net realized gains from fixed-maturity securities	3,833	20	(522)
Equity securities - realized gains (losses) [Abstract]
Realized gains	2,465	7,271	7,678
Realized losses	(1,910)	(455)	(5,329)
Net realized gains (losses) from equity securities	555	6,816	2,349
SalesOfShort-termAndOtherSecuritiesNetRealizedGains(Losses)	2	0	(37)
Gains (Losses) on Sales of Investment Real Estate	0	(5)	4,250
Gain (Loss) on Investments, Total	$ 4,390	$ 6,831	$ 6,040

Investments, Unrealized Gain (Losses) on Investments (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Debt Securities, Available-for-sale [Line Items]
Change in unrealized gains (losses), fixed-maturity securities	$ 84.2	$ (3.3)	$ 51.0

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 320
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481800/320-10-50-2

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 320
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481800/320-10-50-2

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Topic 320
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (aa)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481800/320-10-50-2

Reference 4: http://www.xbrl.org/2003/role/disclosureRef
-Topic 320
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (aaa)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481800/320-10-50-2

Reference 5: http://www.xbrl.org/2003/role/disclosureRef
-Topic 320
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481800/320-10-50-2

Reference 6: http://www.xbrl.org/2003/role/disclosureRef
-Topic 320
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (c)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481800/320-10-50-2

Reference 7: http://www.xbrl.org/2003/role/disclosureRef
-Topic 320
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (d)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481800/320-10-50-2

Reference 8: http://www.xbrl.org/2003/role/disclosureRef
-Topic 320
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 3
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481800/320-10-50-3

Reference 9: http://www.xbrl.org/2003/role/disclosureRef
-Topic 320
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 3
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481800/320-10-50-3

Reference 10: http://www.xbrl.org/2003/role/disclosureRef
-Topic 320
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 3
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481800/320-10-50-3

Reference 11: http://www.xbrl.org/2003/role/disclosureRef
-Topic 320
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 3
-Subparagraph (c)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481800/320-10-50-3

Reference 12: http://www.xbrl.org/2003/role/disclosureRef
-Topic 320
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 3
-Subparagraph (d)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481800/320-10-50-3

+ Details

Investments Investment Deposits and Payables (Details) - USD ($) $ in Millions	Dec. 31, 2025	Dec. 31, 2024
Investments, Debt and Equity Securities [Abstract]
Invested assets on deposit with state regulatory authorities	$ 3.9	$ 3.7
Payable for investments purchased	$ 0.0	$ 0.0

Investments (Details), Real Estate - USD ($) $ in Thousands	12 Months Ended
Investments (Details), Real Estate - USD ($) $ in Thousands	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Real Estate Properties [Line Items]
Real Estate Investment Property, Accumulated Depreciation	$ (5,700)	$ 0
Real Estate Investments, Net	55,236	15,045
Gains (Losses) on Sales of Investment Real Estate	0	(5)	$ 4,250
Investment Income, Investment Expense	4,896	4,154	3,926
Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment	16,505	17,367
Real Estate Investment
Real Estate Properties [Line Items]
Investment Income, Investment Expense	$ 0	$ 0	$ 500

- Definition

The net gain (loss) resulting from sales and other disposals of real estate owned for investment purposes.

+ References + Details

- Definition

Amount of real estate investments, net of accumulated depreciation, which may include the following: (1) land available-for-sale; (2) land available-for-development; (3) investments in building and building improvements; (4) tenant allowances; (5) developments in-process; (6) rental properties; (7) other real estate investments; (8) real estate joint ventures; and (9) unconsolidated real estate and other joint ventures not separately presented.

+ References + Details

Fair value measurements (Details) - Recurring [Member] - USD ($) $ in Thousands	Dec. 31, 2025	Dec. 31, 2024
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value	$ 4,971,713	$ 3,939,636
Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value	607,037	390,688
Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value	4,364,676	3,548,948
Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value	0	0
Fixed Maturities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Estimated Fair Value	4,341,450	3,537,563
Fixed Maturities [Member] \| Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Estimated Fair Value	874	15,048
Fixed Maturities [Member] \| Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Estimated Fair Value	4,340,576	3,522,515
Fixed Maturities [Member] \| Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Estimated Fair Value	0	0
U.S. Treasury Securities and Obligations of U.S. Government Agencies [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Estimated Fair Value	874	15,048
U.S. Treasury Securities and Obligations of U.S. Government Agencies [Member] \| Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Estimated Fair Value	874	15,048
U.S. Treasury Securities and Obligations of U.S. Government Agencies [Member] \| Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Estimated Fair Value	0	0
U.S. Treasury Securities and Obligations of U.S. Government Agencies [Member] \| Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Estimated Fair Value	0	0
Obligations of states, municipalities and political subdivisions [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Estimated Fair Value	127,860	146,304
Obligations of states, municipalities and political subdivisions [Member] \| Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Estimated Fair Value	0	0
Obligations of states, municipalities and political subdivisions [Member] \| Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Estimated Fair Value	127,860	146,304
Obligations of states, municipalities and political subdivisions [Member] \| Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Estimated Fair Value	0	0
Corporate and other securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Estimated Fair Value	1,713,888	1,989,490
Corporate and other securities [Member] \| Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Estimated Fair Value	0	0
Corporate and other securities [Member] \| Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Estimated Fair Value	1,713,888	1,989,490
Corporate and other securities [Member] \| Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Estimated Fair Value	0	0
Asset-backed securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Estimated Fair Value	588,519	732,742
Asset-backed securities [Member] \| Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Estimated Fair Value	0	0
Asset-backed securities [Member] \| Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Estimated Fair Value	588,519	732,742
Asset-backed securities [Member] \| Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Estimated Fair Value	0	0
Residential mortgage-backed securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Estimated Fair Value	1,459,270	448,874
Residential mortgage-backed securities [Member] \| Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Estimated Fair Value	0	0
Residential mortgage-backed securities [Member] \| Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Estimated Fair Value	1,459,270	205,105
Residential mortgage-backed securities [Member] \| Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Estimated Fair Value	0	0
Commercial mortgage-backed aecurities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Estimated Fair Value	451,039	205,105
Commercial mortgage-backed aecurities [Member] \| Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Estimated Fair Value	0	0
Commercial mortgage-backed aecurities [Member] \| Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Estimated Fair Value	451,039	448,874
Commercial mortgage-backed aecurities [Member] \| Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Estimated Fair Value	0	0
Equity Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value	626,399	398,359
Equity Securities [Member] \| Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value	602,299	371,926
Equity Securities [Member] \| Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value	24,100	26,433
Equity Securities [Member] \| Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value	0	0
Exchange Traded Fund [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value	185,523	129,731
Exchange Traded Fund [Member] \| Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value	185,523	129,731
Exchange Traded Fund [Member] \| Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value	0	0
Exchange Traded Fund [Member] \| Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value	0	0
Nonredeemable Preferred Stock [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value	24,100	26,433
Nonredeemable Preferred Stock [Member] \| Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value	0	0
Nonredeemable Preferred Stock [Member] \| Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value	24,100	26,433
Nonredeemable Preferred Stock [Member] \| Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value	0	0
Common Stock [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value	416,776	242,195
Common Stock [Member] \| Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value	416,776	242,195
Common Stock [Member] \| Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value	0	0
Common Stock [Member] \| Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value	0	0
Short-Term Investments
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value	3,864	3,714
Short-Term Investments \| Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value	3,864	3,714
Short-Term Investments \| Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value	0	0
Short-Term Investments \| Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value	$ 0	$ 0

Fair value measurements 2 (Details) - USD ($)	Dec. 31, 2025	Dec. 31, 2024
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets measured at fair value on a nonrecurring basis		$ 0
Cash Equivalents, Fair Value Disclosure	$ 45,300,000	16,100,000
Fair Value, Nonrecurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets measured at fair value on a nonrecurring basis	0	0
Liabilities measured at fair value on a nonrecurring basis	0	0
Reported Value Measurement \| Senior Notes
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-Term Debt, Fair Value	175,000,000.0	175,000,000.0
Estimate of Fair Value Measurement \| Senior Notes \| Level 2 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-Term Debt, Fair Value	$ 173,800,000	$ 168,600,000

Deferred policy acquisition costs (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Movement analysis of deferred policy acquisition costs [Roll Forward]
Balance, beginning of period	$ 109,263	$ 88,395	$ 61,594
Policy acquisition costs deferred:
Direct commissions deferred	291,851	274,124	227,755
Ceding commissions deferred	(116,592)	(120,459)	(88,449)
Other underwriting and policy acquisition costs deferred	16,805	14,215	10,982
Policy acquisition costs deferred	192,064	167,880	150,288
Amortization of net policy acquisition costs	(182,590)	(147,012)	(123,487)
Balance, end of period	$ 118,737	$ 109,263	$ 88,395

- Definition

Amount of amortization expense (reversal of expense) for deferred policy acquisition costs.

+ References

Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Topic 944
-SubTopic 605
-Name Accounting Standards Codification
-Section 55
-Paragraph 14
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147477548/944-605-55-14

Reference 2: http://www.xbrl.org/2003/role/exampleRef
-Topic 944
-SubTopic 605
-Name Accounting Standards Codification
-Section 55
-Paragraph 11
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147477548/944-605-55-11

Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 944
-SubTopic 20
-Name Accounting Standards Codification
-Section 45
-Paragraph 2
-Subparagraph (d)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479868/944-20-45-2

Reference 4: http://www.xbrl.org/2003/role/disclosureRef
-Topic 944
-SubTopic 40
-Name Accounting Standards Codification
-Section 65
-Paragraph 2
-Subparagraph (g)(1)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480016/944-40-65-2

Reference 5: http://fasb.org/us-gaap/role/ref/otherTransitionRef
-Topic 944
-SubTopic 30
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479432/944-30-50-2

Reference 6: http://www.xbrl.org/2003/role/disclosureRef
-Topic 944
-SubTopic 30
-Name Accounting Standards Codification
-Section 50
-Paragraph 2B
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479432/944-30-50-2B

Reference 7: http://www.xbrl.org/2003/role/exampleRef
-Topic 944
-SubTopic 30
-Name Accounting Standards Codification
-Section 55
-Paragraph 2
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479401/944-30-55-2

Reference 8: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 230
-SubTopic 10
-Name Accounting Standards Codification
-Section 45
-Paragraph 28
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482740/230-10-45-28

Reference 9: http://www.xbrl.org/2003/role/disclosureRef
-Topic 944
-SubTopic 220
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-04(7)(a))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147477250/944-220-S99-1

Reference 10: http://www.xbrl.org/2003/role/disclosureRef
-Topic 944
-SubTopic 30
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Subparagraph (c)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479432/944-30-50-1

Reference 11: http://www.xbrl.org/2003/role/disclosureRef
-Topic 220
-SubTopic 40
-Name Accounting Standards Codification
-Section 50
-Paragraph 22
-Subparagraph (u)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147476148/220-40-50-22

+ Details

- Definition

Amount of deferred policy acquisition cost capitalized on contract remaining in force.

+ References + Details

Underwriting, acquisition and insurance expenses (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Underwriting, Acquisition and Insurance Expenses [Abstract]
Direct commissions	$ 286,268	$ 254,523	$ 198,715
Ceding commissions	(119,466)	(120,339)	(84,998)
Other expenses	169,894	151,624	115,253
Total	336,696	285,808	228,970
Salaries, employee benefits and bonus expense	$ 128,900	$ 109,300	$ 85,700

Income taxes (Details) - USD ($) $ in Thousands	12 Months Ended
Income taxes (Details) - USD ($) $ in Thousands	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Income Tax Disclosure [Abstract]
U.S.	$ 634,302	$ 514,716	$ 384,017
Income (Loss) from Continuing Operations before Income Taxes	634,302	514,716	384,017
Components of income tax expense
Current federal income tax expense	130,345	103,701	85,353
Current State and Local Tax Expense (Benefit)	0	0	0
Current Income Tax Expense (Benefit)	130,345	103,701	85,353
Deferred federal income tax benefit	343	(3,828)	(9,429)
Deferred State and Local Income Tax Expense (Benefit)	0	0	0
Deferred tax (benefit) expense	343	(3,828)	(9,429)
Income Tax Expense (Benefit), Total	130,688	99,873	75,924
Effective Income Tax Rate Reconciliation [Line Items]
Income tax expense at federal income tax	$ 133,203	$ 108,090	$ 80,644
Statutory income tax rate, percent	21.00%	21.00%	21.00%
Income tax expense	$ 130,688	$ 99,873	$ 75,924
Effective Income Tax Rate Reconciliation, Percent	20.60%	19.40%	19.80%
Income Taxes Paid, Net	$ 129,600	$ 104,100	$ 84,600
Statutory income tax rate, percent	21.00%	21.00%	21.00%
Unrecognized tax positions	$ 0	$ 0
Taxes Payable	3,600	2,800
Income (Loss) from Continuing Operations before Income Taxes, Foreign	0	0
United States
Effective Income Tax Rate Reconciliation [Line Items]
Effective Income Tax Rate Reconciliation, Tax Credit, Amount	$ (500)	$ 0	$ 0
Effective Income Tax Rate Reconciliation, Tax Credit, Percent	(0.10%)	0.00%	0.00%
Effective Income Tax Rate Reconciliation, Nondeductible Expense, Amount	$ 2,885	$ 1,902	$ 212
Effective Income Tax Rate Reconciliation, Nondeductible Expense, Percent	0.50%	0.40%	0.10%
Excess tax benefits on share-based payments	$ (4,900)	$ (10,119)	$ (4,932)
Effective Income Tax Rate Reconciliation, Tax Expense (Benefit), Share-Based Payment Arrangement, Percent	(0.80%)	(2.00%)	(1.30%)

Income taxes - Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Thousands	Dec. 31, 2025	Dec. 31, 2024
Deferred tax assets [Abstract]
Deferred Tax Assets, Investments	$ 8,662	$ 26,343
Unpaid losses and loss adjustment expenses	49,288	36,491
Unearned premiums	34,267	32,580
State operating loss carryforwards	10,216	8,859
Stock compensation	3,158	3,276
Allowance for credit losses	5,742	5,210
Other	2,145	1,939
Deferred tax assets before allowance	113,478	114,698
Less: valuation allowance	(10,119)	(9,066)
Total deferred tax assets	103,359	105,632
Deferred tax liabilities [Abstract]
Unrealized gains on equity securities	30,129	17,774
Deferred policy acquisition costs, net of ceding commissions	24,935	22,945
Property and equipment	4,894	3,263
Other	1,210	1,435
Total deferred tax liabilities	61,168	45,417
Deferred income tax asset, net	42,191	60,215
State Jurisdiction [Member]
Operating Loss Carryforwards [Line Items]
Operating loss carryforwards	$ 215,500	$ 186,900

Reserves for unpaid losses and loss adjustment expenses (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Reconciliation of consolidated beginning and ending reserves for unpaid losses and loss adjustment expenses [Roll Forward]
Gross reserves for unpaid losses and loss adjustment expenses, beginning of year	$ 2,890,870	$ 2,285,668	$ 1,692,875	$ 1,238,402
Allowance for credit losses - reinsurance recoverables	932
Net reserves for unpaid losses and loss adjustment expenses, beginning of period	1,962,608	1,451,518	1,061,363
Incurred losses and loss adjustment expenses [Abstract]
Current year	953,510	810,554	635,993
Prior year losses and loss adjustment expense	(62,817)	(37,655)	(35,774)
Total net losses and loss adjustment expenses incurred	890,693	772,899	600,219
Payments [Abstract]
Current year	64,288	49,747	38,565
Prior years	279,499	212,062	171,499
Total payments	343,787	261,809	210,064
Net reserves for unpaid losses and loss adjustment expenses, end of period	2,509,514	1,962,608	1,451,518
Reinsurance recoverable for unpaid Claims losses, net, ending balance	381,356	323,060	241,357
Gross reserves for unpaid losses and loss adjustment expenses, end of year	$ 2,890,870	$ 2,285,668	$ 1,692,875

Reserves for unpaid losses and loss adjustment expenses Liability for Unpaid Losses and Loss Adjustment Expenses (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]
Prior Year Claims and Claims Adjustment Expense	$ (62,817)	$ (37,655)	$ (35,774)
Current year	953,510	810,554	635,993
Catastrophe [Member]
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]
Current year	30,400	25,500
Accident Years 2021 and 2022
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]
Prior Year Claims and Claims Adjustment Expense			$ (49,000)
Accident Years 2021 through 2023
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]
Prior Year Claims and Claims Adjustment Expense		$ (57,600)
Short Duration Insurance Contract Accident Years 2020 through 2024
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]
Prior Year Claims and Claims Adjustment Expense	$ (70,900)

Reserves for unpaid losses and loss adjustment expenses Reserve Development (Details)	Dec. 31, 2025 USD ($)	Dec. 31, 2024 USD ($)	Dec. 31, 2023 USD ($)	Dec. 31, 2022 USD ($)	Dec. 31, 2021 USD ($)	Dec. 31, 2020 USD ($)	Dec. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)	Dec. 31, 2016 USD ($)
Claims Development
Liability for claims and claim adjustment expense, net	$ 2,257,280,000
Property [Member]
Claims Development
Cumulative paid claims and allocated claim adjustment expense, net	196,952,000
All outstanding liabilities not separately presented, net of reinsurance	505,000
Liability for claims and claim adjustment expense, net	142,369,000
Incurred claims and claim adjustment expense, net	338,816,000
Casualty - claims made [Member]
Claims Development
Cumulative paid claims and allocated claim adjustment expense, net	188,970,000
All outstanding liabilities not separately presented, net of reinsurance	21,000
Liability for claims and claim adjustment expense, net	325,593,000
Incurred claims and claim adjustment expense, net	514,542,000
Casualty - occurrence [Member]
Claims Development
Cumulative paid claims and allocated claim adjustment expense, net	686,481,000
All outstanding liabilities not separately presented, net of reinsurance	9,093,000
Liability for claims and claim adjustment expense, net	1,789,318,000
Incurred claims and claim adjustment expense, net	2,466,706,000
Accident Year 2016 [Member] \| Casualty - claims made [Member]
Claims Development
Cumulative paid claims and allocated claim adjustment expense, net	12,691,000	$ 12,691,000	$ 12,691,000	$ 12,299,000	$ 12,105,000	$ 11,381,000	$ 9,839,000	$ 6,907,000	$ 3,015,000	$ 1,158,000
Incurred claims and claim adjustment expense, net	12,701,000	12,703,000	12,707,000	13,228,000	13,602,000	13,583,000	14,322,000	14,675,000	14,693,000	19,170,000
Total of IBNR liabilities plus expected development on reported claims	$ 10,000
Cumulative number of reported claims	314
Accident Year 2016 [Member] \| Casualty - occurrence [Member]
Claims Development
Cumulative paid claims and allocated claim adjustment expense, net	$ 60,165,000	57,421,000	55,595,000	51,533,000	43,311,000	34,437,000	28,924,000	17,225,000	6,015,000	1,099,000
Incurred claims and claim adjustment expense, net	65,469,000	65,025,000	65,323,000	64,612,000	60,861,000	57,401,000	55,534,000	53,549,000	55,680,000	$ 61,440,000
Total of IBNR liabilities plus expected development on reported claims	$ 4,441,000
Cumulative number of reported claims	1,715
Accident Year 2017 [Member] \| Casualty - claims made [Member]
Claims Development
Cumulative paid claims and allocated claim adjustment expense, net	$ 12,792,000	12,779,000	12,335,000	12,235,000	11,357,000	10,484,000	8,252,000	4,897,000	340,000
Incurred claims and claim adjustment expense, net	12,836,000	12,840,000	13,471,000	13,698,000	14,989,000	15,794,000	16,120,000	17,097,000	18,116,000
Total of IBNR liabilities plus expected development on reported claims	$ 35,000
Cumulative number of reported claims	372
Accident Year 2017 [Member] \| Casualty - occurrence [Member]
Claims Development
Cumulative paid claims and allocated claim adjustment expense, net	$ 70,258,000	66,435,000	61,108,000	52,069,000	46,025,000	37,736,000	22,407,000	9,352,000	1,581,000
Incurred claims and claim adjustment expense, net	81,696,000	79,203,000	76,715,000	69,911,000	71,117,000	70,641,000	68,985,000	67,151,000	$ 71,126,000
Total of IBNR liabilities plus expected development on reported claims	$ 7,158,000
Cumulative number of reported claims	2,344
Accident Year 2018 [Member] \| Casualty - claims made [Member]
Claims Development
Cumulative paid claims and allocated claim adjustment expense, net	$ 13,329,000	13,247,000	12,623,000	11,205,000	10,330,000	8,931,000	5,030,000	507,000
Incurred claims and claim adjustment expense, net	14,789,000	14,186,000	14,272,000	14,411,000	17,057,000	18,612,000	20,234,000	22,429,000
Total of IBNR liabilities plus expected development on reported claims	$ 562,000
Cumulative number of reported claims	467
Accident Year 2018 [Member] \| Casualty - occurrence [Member]
Claims Development
Cumulative paid claims and allocated claim adjustment expense, net	$ 88,652,000	82,927,000	72,174,000	54,441,000	35,138,000	22,860,000	10,995,000	2,638,000
Incurred claims and claim adjustment expense, net	103,208,000	101,939,000	97,005,000	93,215,000	83,952,000	78,386,000	78,331,000	$ 86,157,000
Total of IBNR liabilities plus expected development on reported claims	$ 10,494,000
Cumulative number of reported claims	2,710
Accident Year 2019 [Member] \| Casualty - claims made [Member]
Claims Development
Cumulative paid claims and allocated claim adjustment expense, net	$ 19,010,000	16,598,000	15,406,000	14,476,000	10,123,000	6,005,000	2,487,000
Incurred claims and claim adjustment expense, net	22,615,000	22,839,000	21,788,000	24,489,000	26,426,000	29,056,000	34,693,000
Total of IBNR liabilities plus expected development on reported claims	$ 1,314,000
Cumulative number of reported claims	567
Accident Year 2019 [Member] \| Casualty - occurrence [Member]
Claims Development
Cumulative paid claims and allocated claim adjustment expense, net	$ 98,239,000	84,496,000	69,384,000	46,478,000	30,518,000	16,687,000	3,944,000
Incurred claims and claim adjustment expense, net	124,190,000	120,003,000	115,681,000	107,480,000	108,138,000	109,994,000	$ 112,266,000
Total of IBNR liabilities plus expected development on reported claims	$ 19,181,000
Cumulative number of reported claims	2,708
Accident Year 2020 [Member] \| Casualty - claims made [Member]
Claims Development
Cumulative paid claims and allocated claim adjustment expense, net	$ 23,356,000	22,445,000	18,589,000	12,551,000	7,446,000	1,002,000
Incurred claims and claim adjustment expense, net	26,257,000	28,877,000	33,667,000	38,287,000	44,641,000	55,630,000
Total of IBNR liabilities plus expected development on reported claims	$ 2,689,000
Cumulative number of reported claims	789
Accident Year 2020 [Member] \| Casualty - occurrence [Member]
Claims Development
Cumulative paid claims and allocated claim adjustment expense, net	$ 78,929,000	55,548,000	32,606,000	17,805,000	8,673,000	2,400,000
Incurred claims and claim adjustment expense, net	142,565,000	140,203,000	135,045,000	131,082,000	136,212,000	$ 154,619,000
Total of IBNR liabilities plus expected development on reported claims	$ 53,064,000
Cumulative number of reported claims	3,451
Accident Year 2021 \| Property [Member]
Claims Development
Cumulative paid claims and allocated claim adjustment expense, net	$ 30,332,000	30,200,000	27,324,000	21,257,000	14,268,000
Incurred claims and claim adjustment expense, net	30,340,000	31,392,000	29,750,000	33,518,000	36,531,000
Total of IBNR liabilities plus expected development on reported claims	$ 0
Cumulative number of reported claims	1,148
Accident Year 2021 \| Casualty - claims made [Member]
Claims Development
Cumulative paid claims and allocated claim adjustment expense, net	$ 19,634,000	16,294,000	12,895,000	8,437,000	1,146,000
Incurred claims and claim adjustment expense, net	32,389,000	36,710,000	52,935,000	66,191,000	84,018,000
Total of IBNR liabilities plus expected development on reported claims	$ 11,658,000
Cumulative number of reported claims	1,091
Accident Year 2021 \| Casualty - occurrence [Member]
Claims Development
Cumulative paid claims and allocated claim adjustment expense, net	$ 84,691,000	57,465,000	31,494,000	12,944,000	3,205,000
Incurred claims and claim adjustment expense, net	206,475,000	204,787,000	193,722,000	190,879,000	$ 200,598,000
Total of IBNR liabilities plus expected development on reported claims	$ 105,695,000
Cumulative number of reported claims	3,542
Accident Year 2022 \| Property [Member]
Claims Development
Cumulative paid claims and allocated claim adjustment expense, net	$ 48,784,000	48,030,000	46,965,000	33,004,000
Incurred claims and claim adjustment expense, net	52,311,000	53,527,000	53,676,000	67,127,000
Total of IBNR liabilities plus expected development on reported claims	$ 2,917,000
Cumulative number of reported claims	2,349
Accident Year 2022 \| Casualty - claims made [Member]
Claims Development
Cumulative paid claims and allocated claim adjustment expense, net	$ 28,758,000	24,033,000	12,381,000	3,052,000
Incurred claims and claim adjustment expense, net	56,758,000	60,873,000	81,394,000	101,064,000
Total of IBNR liabilities plus expected development on reported claims	$ 21,721,000
Cumulative number of reported claims	1,251
Accident Year 2022 \| Casualty - occurrence [Member]
Claims Development
Cumulative paid claims and allocated claim adjustment expense, net	$ 103,263,000	56,201,000	23,084,000	4,658,000
Incurred claims and claim adjustment expense, net	292,377,000	287,977,000	271,399,000	$ 272,692,000
Total of IBNR liabilities plus expected development on reported claims	$ 162,331,000
Cumulative number of reported claims	4,350
Accident Year 2023 \| Property [Member]
Claims Development
Cumulative paid claims and allocated claim adjustment expense, net	$ 28,734,000	26,434,000	20,267,000
Incurred claims and claim adjustment expense, net	43,569,000	54,503,000	75,517,000
Total of IBNR liabilities plus expected development on reported claims	$ 12,150,000
Cumulative number of reported claims	999
Accident Year 2023 \| Casualty - claims made [Member]
Claims Development
Cumulative paid claims and allocated claim adjustment expense, net	$ 31,206,000	16,895,000	4,830,000
Incurred claims and claim adjustment expense, net	83,123,000	91,516,000	115,858,000
Total of IBNR liabilities plus expected development on reported claims	$ 43,710,000
Cumulative number of reported claims	1,498
Accident Year 2023 \| Casualty - occurrence [Member]
Claims Development
Cumulative paid claims and allocated claim adjustment expense, net	$ 65,628,000	21,930,000	4,329,000
Incurred claims and claim adjustment expense, net	379,978,000	372,413,000	$ 372,245,000
Total of IBNR liabilities plus expected development on reported claims	$ 279,930,000
Cumulative number of reported claims	4,792
Accident Year 2024 \| Property [Member]
Claims Development
Cumulative paid claims and allocated claim adjustment expense, net	$ 46,611,000	31,303,000
Incurred claims and claim adjustment expense, net	83,016,000	112,051,000
Total of IBNR liabilities plus expected development on reported claims	$ 26,458,000
Cumulative number of reported claims	1,483
Accident Year 2024 \| Casualty - claims made [Member]
Claims Development
Cumulative paid claims and allocated claim adjustment expense, net	$ 23,330,000	6,755,000
Incurred claims and claim adjustment expense, net	113,003,000	123,511,000
Total of IBNR liabilities plus expected development on reported claims	$ 76,532,000
Cumulative number of reported claims	1,610
Accident Year 2024 \| Casualty - occurrence [Member]
Claims Development
Cumulative paid claims and allocated claim adjustment expense, net	$ 31,578,000	6,032,000
Incurred claims and claim adjustment expense, net	489,026,000	$ 490,719,000
Total of IBNR liabilities plus expected development on reported claims	$ 430,927,000
Cumulative number of reported claims	4,329
us-gaap_ShortDurationInsuranceContractAccidentYear2025Member [Domain] \| Property [Member]
Claims Development
Cumulative paid claims and allocated claim adjustment expense, net	$ 42,491,000
Incurred claims and claim adjustment expense, net	129,580,000
Total of IBNR liabilities plus expected development on reported claims	$ 75,567,000
Cumulative number of reported claims	917
us-gaap_ShortDurationInsuranceContractAccidentYear2025Member [Domain] \| Casualty - claims made [Member]
Claims Development
Cumulative paid claims and allocated claim adjustment expense, net	$ 4,864,000
Incurred claims and claim adjustment expense, net	140,071,000
Total of IBNR liabilities plus expected development on reported claims	$ 122,573,000
Cumulative number of reported claims	1,629
us-gaap_ShortDurationInsuranceContractAccidentYear2025Member [Domain] \| Casualty - occurrence [Member]
Claims Development
Cumulative paid claims and allocated claim adjustment expense, net	$ 5,078,000
Incurred claims and claim adjustment expense, net	581,722,000
Total of IBNR liabilities plus expected development on reported claims	$ 559,623,000
Cumulative number of reported claims	2,959

Reserves for unpaid losses and loss adjustment expenses Historical Claims Duration (Details)	Dec. 31, 2025 Rate
Property [Member]
Historical Claims Duration [Line Items]
Historical Claims Duration, Year One	45.40%
Historical Claims Duration, Year Two	20.60%
Historical Claims Duration, Year Three	9.10%
Historical Claims Duration, Year Four	5.50%
Historical Claims Duration, Year Five	0.40%
Casualty - claims made [Member]
Historical Claims Duration [Line Items]
Historical Claims Duration, Year One	5.40%
Historical Claims Duration, Year Two	21.00%
Historical Claims Duration, Year Three	21.50%
Historical Claims Duration, Year Four	15.90%
Historical Claims Duration, Year Five	9.00%
Historical Claims Duration, Year Six	6.20%
Historical Claims Duration, Year Seven	4.30%
Historical Claims Duration, Year Eight	2.40%
Historical Claims Duration, Year Nine	0.10%
Historical Claims Duration, Year Ten	0.00%
Casualty - occurrence [Member]
Historical Claims Duration [Line Items]
Historical Claims Duration, Year One	1.70%
Historical Claims Duration, Year Two	6.70%
Historical Claims Duration, Year Three	11.70%
Historical Claims Duration, Year Four	14.30%
Historical Claims Duration, Year Five	14.20%
Historical Claims Duration, Year Six	13.30%
Historical Claims Duration, Year Seven	11.30%
Historical Claims Duration, Year Eight	6.10%
Historical Claims Duration, Year Nine	3.70%
Historical Claims Duration, Year Ten	4.20%

Reserves for unpaid losses and loss adjustment expenses Reconciliation of Claims Development to Liability (Details) - USD ($) $ in Thousands	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Short-duration Insurance Contracts, Reconciliation of Claims Development to Liability [Line Items]
Liability for claims and claim adjustment expense, net	$ 2,257,280
Reinsurance recoverable for unpaid losses	381,356	$ 323,060	$ 241,357	$ 177,039
Reinsurance Recoverable, Allowance for Credit Loss	(1,072)	$ (932)
Unallocated claim adjustment expenses	251,162
Property [Member]
Short-duration Insurance Contracts, Reconciliation of Claims Development to Liability [Line Items]
Liability for claims and claim adjustment expense, net	142,369
Reinsurance recoverable for unpaid losses	112,836
Casualty - claims made [Member]
Short-duration Insurance Contracts, Reconciliation of Claims Development to Liability [Line Items]
Liability for claims and claim adjustment expense, net	325,593
Reinsurance recoverable for unpaid losses	22,702
Casualty - occurrence [Member]
Short-duration Insurance Contracts, Reconciliation of Claims Development to Liability [Line Items]
Liability for claims and claim adjustment expense, net	1,789,318
Reinsurance recoverable for unpaid losses	$ 246,890

- Definition

Amount, after valuation allowance, recoverable under reinsurance contracts for losses reported to the ceding insurer but not yet paid and amounts expected for incurred losses and settlement expenses, which have not yet been reported to the ceding insurer.

+ References + Details

Reinsurance, Effects of Reinsurance on Premiums Written and Earned (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Written [Abstract]
Direct	$ 1,977,171	$ 1,870,341	$ 1,568,815
Ceded	(361,154)	(392,993)	(304,185)
Net written premiums	1,616,017	1,477,348	1,264,630
Earned [Abstract]
Direct	1,945,225	1,743,243	1,367,141
Ceded	(369,383)	(392,773)	(294,604)
Net earned premiums	1,575,842	1,350,470	1,072,537
Ceded incurred losses and loss adjustment expenses	$ 121,900	$ 125,400	$ 115,900

- Definition

Amount of earned premiums ceded to other entities.

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Amount, before premiums ceded to other entities and premiums assumed by the entity, of premiums earned.

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Amount, after premiums ceded to other entities and premiums assumed by the entity, of premiums earned.

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+ Details

Reinsurance Reinsurance Balances (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Reinsurance Disclosure [Abstract]
Reinsurance recoverables on paid losses, gross	$ 12,973	$ 14,831
Reinsurance recoverable for unpaid losses	381,356	323,060	$ 241,357	$ 177,039
Reinsurance recoverables, net of allowance for credit losses of $1,072 in 2025 and $932 in 2024	394,329	337,891
Reinsurance Recoverable, Allowance for Credit Loss	1,072	932
Concentration Risk [Line Items]
Reinsurance recoverables, net of allowance for credit losses of $1,072 in 2025 and $932 in 2024	394,329	337,891
Ceded unearned premiums	44,506	$ 52,736
Credit Risk Reinsurer One [Member]
Reinsurance Disclosure [Abstract]
Reinsurance recoverables, net of allowance for credit losses of $1,072 in 2025 and $932 in 2024	95,800
Concentration Risk [Line Items]
Reinsurance recoverables, net of allowance for credit losses of $1,072 in 2025 and $932 in 2024	95,800
Ceded unearned premiums	9,800
Credit Risk Reinsurer Two [Member]
Reinsurance Disclosure [Abstract]
Reinsurance recoverables, net of allowance for credit losses of $1,072 in 2025 and $932 in 2024	46,300
Concentration Risk [Line Items]
Reinsurance recoverables, net of allowance for credit losses of $1,072 in 2025 and $932 in 2024	46,300
Ceded unearned premiums	5,300
Credit Risk Reinsurer Three [Member]
Reinsurance Disclosure [Abstract]
Reinsurance recoverables, net of allowance for credit losses of $1,072 in 2025 and $932 in 2024	37,900
Concentration Risk [Line Items]
Reinsurance recoverables, net of allowance for credit losses of $1,072 in 2025 and $932 in 2024	37,900
Ceded unearned premiums	4,700
Credit Risk Reinsurer Four [Member]
Reinsurance Disclosure [Abstract]
Reinsurance recoverables, net of allowance for credit losses of $1,072 in 2025 and $932 in 2024	30,800
Concentration Risk [Line Items]
Reinsurance recoverables, net of allowance for credit losses of $1,072 in 2025 and $932 in 2024	30,800
Ceded unearned premiums	4,500
Credit Risk Reinsurer Five [Member]
Reinsurance Disclosure [Abstract]
Reinsurance recoverables, net of allowance for credit losses of $1,072 in 2025 and $932 in 2024	24,600
Concentration Risk [Line Items]
Reinsurance recoverables, net of allowance for credit losses of $1,072 in 2025 and $932 in 2024	24,600
Ceded unearned premiums	$ 4,000
Prepaid reinsurance premiums ceded to five reinsurers as a percentage of total ceded unearned premium balance [Member] \| Major Reinsurers [Member] \| Reinsurer Concentration Risk [Member]
Concentration Risk [Line Items]
Concentration risk, percentage	63.70%
Reinsurance recoverables on paid and unpaid losses from the Company’s five largest reinsurers as percent of total reinsurance recoverables [Member] \| Major Reinsurers [Member] \| Reinsurer Concentration Risk [Member]
Concentration Risk [Line Items]
Concentration risk, percentage	59.70%

Stockholders' Equity Capital Stock (Details) - $ / shares	Dec. 31, 2025	Dec. 31, 2024
Equity, Attributable to Parent [Abstract]
Preferred stock, shares issued	0	0
Common stock, shares authorized (in shares)	400,000,000	400,000,000
Common stock, par value (in dollars per share)	$ 0.01	$ 0.01
Preferred stock, shares authorized (in shares)	100,000,000	100,000,000
Preferred stock, outstanding (in shares)	0	0
Preferred stock, par value (in dollars per share)	$ 0.01	$ 0.01

Stockholders' Equity, Equity-based Compensation, Options (Details) - USD ($) $ / shares in Units, $ in Thousands		12 Months Ended
	Jul. 27, 2016	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023	May 22, 2025
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock based compensation		$ 17,900	$ 14,100	$ 9,400
Share-based Compensation Arrangement by Share-based Payment Award, Options, Additional Disclosures [Abstract]
Intrinsic value of options exercised		$ 18,700	$ 38,200
Stock options [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Contractual term of option granted	10 years
Award vesting period	4 years
Granted (in dollars per share)	$ 2.71
Options outstanding, number of awards [Roll Forward]
Options, beginning of the year (in shares)		118,468
Granted, shares		0
Forfeited (in shares)		0
Exercised (in shares)		(42,554)
Options, end of year (in shares)		75,914	118,468
Exercisable, shares		75,914
Options outstanding, weighted average exercise price [Abstract]
Options beginning of the year (in dollars per share)		$ 16.00
Granted	$ 16.00	0
Forfeited		0
Exercised		16.00
Options end of the year (in dollars per share)		16.00	$ 16.00
Exercisable		$ 16.00
Share-based Compensation Arrangement by Share-based Payment Award, Options, Additional Disclosures [Abstract]
Outstanding, weighted average remaining contractual term		7 months 6 days
Exercisable, weighted average remaining contractual term		7 months 6 days
Outstanding, aggregate intrinsic value		$ 28,477
Exercisable, aggregate intrinsic value		$ 28,477
2016 Omnibus Incentive Plan [Member] \| Stock options [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options granted (in shares)	1,036,916
2025 Omnibus Incentive Plan \| Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares reserved for future issuance					860,500
2025 Omnibus Incentive Plan \| Stock options [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options granted (in shares)		0

Stockholders' Equity - Equity-based Compensation, Restricted Stock (Details) - Restricted Stock [Member] - USD ($) $ / shares in Units, $ in Millions	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares withheld for taxes	14,536
Vested in period, fair value	$ 19.0	$ 20.0	$ 12.8
Nonvested Restricted Stock, Number of Shares [Roll Forward]
Nonvested outstanding at the beginning of the period, shares		110,123
Granted, shares	59,963
Vested, shares	(43,685)
Forfeited, shares	(2,351)
Nonvested outstanding at the end of the period, shares	124,050
Nonvested Restricted Stock, Weighted Average Grant Date Fair Value [Abstract]
Nonvested outstanding at the beginning of the period	$ 366.73
Granted	433.62	$ 502.43	$ 313.35
Vested	322.04
Forfeited	390.17
Nonvested outstanding at the end of the period	$ 414.36	$ 366.73
Unrecognized stock-based compensation expense	$ 35.5
Compensation cost not yet recognized, period	2 years 2 months 12 days
Minimum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting Period	1 year
Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting Period	4 years

Stockholders' Equity - Subsequent Event (Details) - $ / shares			12 Months Ended
	Feb. 04, 2026	Jan. 01, 2026	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Subsequent Event [Member] \| O2026Q1Dividends
Subsequent Event [Line Items]
Dividend declared date	Feb. 04, 2026
Dividends payable, per share	$ 0.25
Dividend payable date	Mar. 12, 2026
Dividend record date	Feb. 26, 2026
Restricted Stock [Member]
Subsequent Event [Line Items]
Grant date fair value			$ 433.62	$ 502.43	$ 313.35
Restricted Stock [Member] \| Subsequent Event [Member]
Subsequent Event [Line Items]
Granted		4,140
Grant date fair value		$ 391.12

Stockholders' Equity (Details) - Treasury Stock - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024
Equity [Abstract]
Share Repurchase Program, Authorized, Amount	$ 250.0	$ 100.0
Share Repurchase Program, Excise Tax	$ 0.6	$ 0.0

Earnings per share (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Reconciliation of numerator and denominator of the basic and diluted earnings per share computations [Abstract]
Net income	$ 503,614	$ 414,843	$ 308,093
Basic earnings per share [Abstract]
Earnings per share - basic	$ 21.76	$ 17.92	$ 13.37
Diluted earnings per share [Abstract]
Earnings per share - diluted	$ 21.65	$ 17.78	$ 13.22
Basic weighted average shares outstanding [Abstract]
Weighted average shares outstanding - basic	23,140,000	23,153,000	23,045,000
Dilutive effect of shares issued under stock compensation arrangements [Abstract]
Dilutive effect of shares issued under stock compensation arrangements (in shares)	119,000	179,000	262,000
Diluted weighted average shares outstanding [Abstract]
Weighted average shares outstanding - diluted (in shares)	23,259,000	23,332,000	23,307,000
Antidilutive securities (in shares)	56,000	43,000	1,000
Stock options [Member]
Dilutive effect of shares issued under stock compensation arrangements [Abstract]
Dilutive effect of shares issued under stock compensation arrangements (in shares)	89,000	136,000	214,000
Restricted Stock [Member]
Dilutive effect of shares issued under stock compensation arrangements [Abstract]
Dilutive effect of shares issued under stock compensation arrangements (in shares)	30,000	43,000	48,000

Debt (Details) - USD ($) $ in Thousands	12 Months Ended
Debt (Details) - USD ($) $ in Thousands	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Debt Instrument [Line Items]
Repayments of Long-Term Lines of Credit	$ 0	$ 0	$ 62,000
Proceeds from Lines of Credit	40,000	0	0
Interest Paid, Excluding Capitalized Interest, Operating Activity	10,400	10,300	$ 10,500
Debt Issuance Costs, Net	(1,603)	(1,878)
Long-Term Debt	$ 224,397	184,122
Debt Instrument, Covenant Description	In December 2025, the covenants limiting restricted payments under the Note Purchase Agreement and Amended and Restated Credit Agreement were amended to allow the Company to make restricted payments so long as at the time of the declaration of such restricted payment, no event of default under the Note Purchase Agreement has occurred and is continuing or would arise after giving effect, on a pro forma basis, to such restricted payment if such restricted payment were to be made at such time of declaration.
2026	$ 0
2027	51,000
2028	0
2029	0
2030	35,000
2031 and after	140,000
Long-Term Debt, Gross	226,000
Senior Notes
Debt Instrument [Line Items]
Debt instrument borrowing capacity	200,000
Long-Term Debt	175,000
2026	0
2027	0
2028	0
2029	0
2030	35,000
2031 and after	$ 140,000
Line of Credit
Debt Instrument [Line Items]
Maturity date	Jul. 22, 2027
Accordion feature	$ 30,000
Line of Credit Facility, Commitment Fee Percentage	0.25%
Credit facility	$ 51,000	11,000
Interest rate description	The loans under the Amended and Restated Credit Agreement bear interest, at the Company's option, at a rate equal to the Adjusted Term SOFR Rate (as defined therein) plus 1.625% or the Alternate Base Rate (as defined therein) plus 0.625%.
Current borrowing capacity	$ 100,000
Weighted average interest rate	5.83%
2026	$ 0
2027	51,000
2028	0
2029	0
2030	0
2031 and after	$ 0
2034 Series A Notes \| Senior Notes
Debt Instrument [Line Items]
Debt Instrument, Issuance Date	Jul. 22, 2022
Debt Instrument, Face Amount	$ 125,000	125,000
Debt Instrument, Interest Rate, Stated Percentage	5.15%
Debt Instrument, Maturity Date	Jul. 22, 2034
Debt Instrument, Date of First Required Payment	Jul. 22, 2030
Debt Instrument, Periodic Payment, Principal	$ 25,000
2034 Series B Notes \| Senior Notes
Debt Instrument [Line Items]
Debt Instrument, Issuance Date	Sep. 18, 2023
Debt Instrument, Face Amount	$ 50,000	$ 50,000
Debt Instrument, Interest Rate, Stated Percentage	6.21%
Debt Instrument, Maturity Date	Jul. 22, 2034
Debt Instrument, Date of First Required Payment	Jul. 22, 2030
Debt Instrument, Periodic Payment, Principal	$ 10,000

Employee benefit plan (Details) - USD ($) $ in Millions	12 Months Ended
Employee benefit plan (Details) - USD ($) $ in Millions	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Retirement Benefits [Abstract]
Expenses related to employee benefit plan	$ 5.8	$ 5.0	$ 3.8

Other comprehensive income (loss) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Other Comprehensive Income (Loss), Net of Tax [Abstract]
Unrealized gains (losses) arising during the period, before income taxes	$ 86,490	$ (2,921)	$ 49,384
Income taxes	(18,163)	613	(10,371)
Unrealized gains (losses) arising during the period, net of income tax	68,327	(2,308)	39,013
Less reclassification adjustment [Abstract]
Net realized investment gains	2,297	(170)	(1,443)
Income taxes	(482)	36	303
Reclassification adjustment included in net income	1,815	(134)	(1,140)
Allowance for Credit losses expense, before Tax	(2)	526	(187)
Income taxes	0	(111)	39
Reclassification adjustment included in net income	(2)	415	(148)
Other comprehensive income (loss)	$ 66,514	$ (2,589)	$ 40,301

Segment Reporting (Details) $ in Thousands	12 Months Ended
Segment Reporting (Details) $ in Thousands	Dec. 31, 2025 USD ($)	Dec. 31, 2024 USD ($)	Dec. 31, 2023 USD ($)
Segment Reporting [Abstract]
Number of operating segments	1
Segment Reporting Information [Line Items]
Premiums Earned, Net	$ 1,575,842	$ 1,350,470	$ 1,072,537
Insurance Fee Income	40,714	34,118	27,026
Net investment income	192,192	150,287	102,335
Change in the fair value of equity securities	58,836	43,367	15,277
Net realized investment gains	4,390	6,831	6,040
Change in allowance for credit losses on investments	(2)	526	(187)
Other income	2,015	1,926	1,421
Revenues	1,873,987	1,587,525	1,224,449
Current year	953,510	810,554	635,993
Prior year losses and loss adjustment expense	(62,817)	(37,655)	(35,774)
Net commissions incurred		134,184	113,717
Salaries, employee benefits and bonus expense	128,900	109,300	85,700
Depreciation and amortization	5,834	5,802	3,274
Interest expense	10,646	10,134	10,301
Income tax expense	130,688	99,873	75,924
Net income	$ 503,614	414,843	308,093
Number of Reportable Segments	1
Catastrophe [Member]
Segment Reporting Information [Line Items]
Current year	$ 30,400	25,500
Segments [Axis]
Segment Reporting Information [Line Items]
Net commissions incurred	166,802
Segments [Axis] \| Excess and Surplus Lines Segment
Segment Reporting Information [Line Items]
Premiums Earned, Net	1,575,842	1,350,470	1,072,537
Insurance Fee Income	40,714	34,118	27,026
Net investment income	192,192	150,287	102,335
Change in the fair value of equity securities	58,836	43,367	15,277
Net realized investment gains	4,390	6,831	6,040
Change in allowance for credit losses on investments	(2)	526	(187)
Other income	2,015	1,926	1,421
Revenues	1,873,987	1,587,525	1,224,449
Current year	923,160	785,036	631,407
Prior year losses and loss adjustment expense	(62,817)	(37,655)	(35,774)
Salaries, employee benefits and bonus expense	128,917	109,319	85,689
Additions amounts charged to expense	10,503	17,397	9,790
Depreciation and amortization	4,777	4,686	2,655
Interest expense	10,646
Selling, General and Administrative Expense	27,347	24,190	18,061
Income tax expense	130,688	99,873	75,924
Net income	503,614	414,843	308,093
Segments [Axis] \| Excess and Surplus Lines Segment \| Catastrophe [Member]
Segment Reporting Information [Line Items]
Current year	$ 30,350	$ 25,518	$ 4,586

Underwriting information (Details) $ in Thousands	12 Months Ended
Underwriting information (Details) $ in Thousands	Dec. 31, 2025 USD ($) Rate	Dec. 31, 2024 USD ($)	Dec. 31, 2023 USD ($)
Revenue from External Customer [Line Items]
Gross written premiums	$ 1,977,171	$ 1,870,341	$ 1,568,815
Commercial Property [Member]
Revenue from External Customer [Line Items]
Gross written premiums	374,451	456,170	411,956
Excess Casualty [Member]
Revenue from External Customer [Line Items]
Gross written premiums	276,998	245,137	194,049
Small Business [Member]
Revenue from External Customer [Line Items]
Gross written premiums	202,412	195,593	174,080
Construction [Member]
Revenue from External Customer [Line Items]
Gross written premiums	147,601	148,558	137,902
Allied Health [Member]
Revenue from External Customer [Line Items]
Gross written premiums	96,982	83,058	67,808
Products Liability [Member]
Revenue from External Customer [Line Items]
Gross written premiums	67,883	67,035	61,786
Life Sciences [Member]
Revenue from External Customer [Line Items]
Gross written premiums	35,284	36,252	41,379
General Casualty [Member]
Revenue from External Customer [Line Items]
Gross written premiums	207,888	169,162	118,745
Management Liability [Member]
Revenue from External Customer [Line Items]
Gross written premiums	18,582	21,705	26,617
Energy [Member]
Revenue from External Customer [Line Items]
Gross written premiums	46,102	42,710	38,637
Environmental [Member]
Revenue from External Customer [Line Items]
Gross written premiums	31,559	30,372	25,938
Entertainment
Revenue from External Customer [Line Items]
Gross written premiums	70,049	55,168	36,566
Health Care [Member]
Revenue from External Customer [Line Items]
Gross written premiums	25,821	23,179	20,378
Inland Marine [Member]
Revenue from External Customer [Line Items]
Gross written premiums	33,525	27,184	18,669
Public Entity [Member]
Revenue from External Customer [Line Items]
Gross written premiums	18,121	20,047	20,027
Personal Insurance [Member]
Revenue from External Customer [Line Items]
Gross written premiums	23,727	22,090	24,182
Small Property
Revenue from External Customer [Line Items]
Gross written premiums	102,413	76,800	43,893
Commercial Auto
Revenue from External Customer [Line Items]
Gross written premiums	48,721	35,047	19,050
Aviation
Revenue from External Customer [Line Items]
Gross written premiums	9,659	8,591	6,453
Product Recall
Revenue from External Customer [Line Items]
Gross written premiums	2,686	2,397	1,637
Ocean Marine
Revenue from External Customer [Line Items]
Gross written premiums	3,761	3,655	2,339
Excess Professional
Revenue from External Customer [Line Items]
Gross written premiums	41,453	32,633	24,033
High Value Homeowners
Revenue from External Customer [Line Items]
Gross written premiums	36,062	26,844	14,295
Commercial [Member]
Revenue from External Customer [Line Items]
Gross written premiums	1,917,382	1,821,407	1,530,338
Personal [Member]
Revenue from External Customer [Line Items]
Gross written premiums	59,789	48,934	38,477
Professional Liability Insurance
Revenue from External Customer [Line Items]
Gross written premiums	33,091	35,104	36,087
Agribusiness
Revenue from External Customer [Line Items]
Gross written premiums	13,671	5,850	2,309
Agribusiness - Property
Revenue from External Customer [Line Items]
Gross written premiums	$ 8,669	$ 0	$ 0
Revenue Benchmark [Member]
Revenue from External Customer [Line Items]
Number of insurance brokers	3
Insurance brokers greater than 10% of gross written premium	0
Major Insurance Brokers, Group One [Member] \| Revenue Benchmark [Member]
Revenue from External Customer [Line Items]
Gross written premiums	$ 371,200
Major Insurance Brokers, Group One [Member] \| Revenue Benchmark [Member] \| Customer Concentration Risk
Revenue from External Customer [Line Items]
Concentration risk, percentage \| Rate	18.80%
Major Insurance Brokers, Group Two [Member] \| Revenue Benchmark [Member]
Revenue from External Customer [Line Items]
Gross written premiums	$ 339,000
Major Insurance Brokers, Group Two [Member] \| Revenue Benchmark [Member] \| Customer Concentration Risk
Revenue from External Customer [Line Items]
Concentration risk, percentage \| Rate	17.10%
Major Insurance Brokers, Group Three [Member] \| Revenue Benchmark [Member]
Revenue from External Customer [Line Items]
Gross written premiums	$ 231,200
Major Insurance Brokers, Group Three [Member] \| Revenue Benchmark [Member] \| Customer Concentration Risk
Revenue from External Customer [Line Items]
Concentration risk, percentage \| Rate	11.70%

Statutory financial information (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Statutory Accounting Practices, Statutory Amount Available for Dividend Payments [Abstract]
Statutory net income	$ 447,965	$ 357,896	$ 259,042
Statutory capital and surplus	$ 1,933,169	$ 1,525,851	$ 1,167,382
Percentage of policyholder surplus as of end of prior year used in determining maximum dividend distribution	10.00%
Maximum dividend distribution that can be paid without prior approval	$ 444,300

Subsequent Events (Details) - USD ($) $ in Thousands	12 Months Ended
Subsequent Events (Details) - USD ($) $ in Thousands	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Subsequent Events [Abstract]
Current year	$ 953,510	$ 810,554	$ 635,993
Subsequent Event [Line Items]
Current year	953,510	810,554	$ 635,993
Catastrophe [Member]
Subsequent Events [Abstract]
Current year	30,400	25,500
Subsequent Event [Line Items]
Current year	$ 30,400	$ 25,500

Schedule I-Summary of Investments-Other than Related Parties (Details) $ in Thousands	Dec. 31, 2025 USD ($)
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items]
Cost	$ 4,924,751
Amount	5,026,949
Fixed Maturities [Member]
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items]
Cost	4,382,725
Fair Value	4,341,450
Amount	4,341,450
US Treasury and Government [Member]
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items]
Cost	861
Fair Value	874
Amount	874
US States and Political Subdivisions Debt Securities [Member]
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items]
Cost	146,222
Fair Value	127,860
Amount	127,860
Debt Security, Corporate, US [Member]
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items]
Cost	1,711,348
Fair Value	1,713,888
Amount	1,713,888
Asset-backed Securities [Member]
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items]
Cost	582,780
Fair Value	588,519
Amount	588,519
Residential Mortgage Backed Securities [Member]
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items]
Cost	1,491,642
Fair Value	1,459,270
Amount	1,459,270
Commercial mortgage-backed aecurities [Member]
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items]
Cost	449,872
Fair Value	451,039
Amount	451,039
Equity Securities, Investment Summary [Member]
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items]
Cost	482,926
Fair Value	626,399
Amount	626,399
Exchange Traded Funds [Member]
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items]
Cost	104,371
Fair Value	185,523
Amount	185,523
Banks, Trust and Insurance, Equities
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items]
Cost	72,292
Fair Value	90,878
Amount	90,878
Industrial, Miscellaneous, and All Others
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items]
Cost	281,325
Fair Value	325,898
Amount	325,898
Nonredeemable Preferred Stock [Member]
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items]
Cost	24,938
Fair Value	24,100
Amount	24,100
Short-Term Investments
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items]
Cost	3,864
Fair Value	3,864
Amount	$ 3,864

Schedule II - Condensed Financial Information of Registrant, Balance Sheets (Details) - USD ($) $ in Thousands	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Assets
Deferred income tax asset, net	$ 42,191	$ 60,215
Other assets	94,386	87,774
Total assets	6,043,561	4,886,704
Liabilities:
Accounts payable and accrued expenses	66,301	55,159
Long-Term Debt	224,397	184,122
Other liabilities	7,631	5,786
Total liabilities	4,083,978	3,403,143
Stockholders' Equity [Abstract]
Common stock	234	233
Additional paid-in capital	373,681	361,398
Retained earnings	1,716,945	1,229,136
Accumulated other comprehensive loss	(30,692)	(97,206)
Stockholders' equity	1,959,583	1,483,561	$ 1,086,832	$ 745,449
Total liabilities and stockholders' equity	6,043,561	4,886,704
Treasury Stock, Value	(100,585)	(10,000)
Parent Company [Member]
Assets
Cash and cash equivalents	49,969	12,336	$ 17,082	$ 34,789
Investment in subsidiaries	2,103,519	1,604,811
Deferred income tax asset, net	2,388	2,527
Other assets	648	664
Total assets	2,190,465	1,672,634
Liabilities:
Accounts payable and accrued expenses	2,752	2,001
Income tax payable	3,603	2,842
Long-Term Debt	224,397	184,122
Other liabilities	130	108
Total liabilities	230,882	189,073
Stockholders' Equity [Abstract]
Common stock	234	233
Additional paid-in capital	373,681	361,398
Retained earnings	1,716,945	1,229,136
Accumulated other comprehensive loss	(30,692)	(97,206)
Stockholders' equity	1,959,583	1,483,561
Total liabilities and stockholders' equity	2,190,465	1,672,634
Treasury Stock, Value	(100,585)	(10,000)
Parent Company [Member] \| Related Party
Assets
Due from subsidiaries	$ 33,941	$ 52,296

Schedule II - Condensed Financial Information of Registrant, Statements of Income and Comprehensive Income (Loss) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Revenues:
Revenues	$ 1,873,987	$ 1,587,525	$ 1,224,449
Net investment income	192,192	150,287	102,335
Expenses [Abstract]
Other expenses	1,650	3,968	942
Total expenses	1,239,685	1,072,809	840,432
Income tax benefit	130,688	99,873	75,924
Net income	503,614	414,843	308,093
Other Comprehensive Income (Loss) [Abstract]
Comprehensive income	570,128	412,254	348,394
Interest expense	10,646	10,134	10,301
Parent Company [Member]
Revenues:
Revenues	22,008	17,410	11,918
Net investment income	1,186	641	0
Expenses [Abstract]
Other operating expenses	21,938	17,193	13,007
Other expenses	0	615	0
Total expenses	32,584	27,942	23,308
Loss before equity in net income of subsidiaries	(10,576)	(10,532)	(11,390)
Income tax benefit	(6,996)	(12,346)	(7,324)
Income before equity in net income of subsidiaries	(3,580)	1,814	(4,066)
Equity in net income of subsidiaries	507,194	413,029	312,159
Net income	503,614	414,843	308,093
Other Comprehensive Income (Loss) [Abstract]
Equity in other comprehensive earnings (losses) of subsidiaries	66,514	(2,589)	40,301
Comprehensive income	570,128	412,254	348,394
Interest expense	10,646	10,134	10,301
Parent Company [Member] \| Related Party
Revenues:
Revenues	$ 20,822	$ 16,769	$ 11,918

Schedule II - Condensed Financial Information of Registrant, Statements of Cash Flows (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Operating activities:
Net income	$ 503,614	$ 414,843	$ 308,093
Adjustments to reconcile net income to net cash used in operating activities:
Deferred tax (benefit) expense	343	(3,828)	(9,429)
Stock compensation expense	17,884	14,146	9,361
Income taxes (recoverable) payable	761	(359)	742
Net cash provided by operating activities	1,043,738	976,301	859,835
Cash Provided by (Used in) Investing Activity, Including Discontinued Operation [Abstract]
Net cash provided by (used in) investing activities	(922,210)	(960,125)	(860,892)
Financing activities:
Proceeds from Lines of Credit	40,000	0	0
Dividends paid	(15,782)	(13,940)	(12,954)
Proceeds from Issuance of Long-Term Debt	0	0	50,000
Repayments of Long-Term Lines of Credit	0	0	(62,000)
Debt issuance costs	0	0	(164)
Payroll taxes withheld and remitted on share-based payments	(6,281)	(7,047)	(4,282)
Common stock issued, stock options exercised	681	1,330	877
Net cash provided by (used in) financing activities	(71,380)	(29,657)	(28,523)
Net change in cash and cash equivalents	50,148	(13,481)	(29,580)
Payments for Repurchase of Common Stock	(89,998)	(10,000)	0
Accounts payable and accrued expenses	10,861	8,936	12,519
Dividends received from subsidiary			0
Parent Company [Member]
Operating activities:
Net income	503,614	414,843	308,093
Adjustments to reconcile net income to net cash used in operating activities:
Deferred tax (benefit) expense	139	(854)	(372)
Stock compensation expense	17,884	14,146	9,361
Equity in undistributed earnings of subsidiaries	(507,194)	(413,029)	(312,159)
Changes in operating assets and liabilities	18,645	(25,795)	55,893
Income taxes (recoverable) payable	761	(359)	0
Net cash provided by operating activities	139,013	35,911	60,816
Cash Provided by (Used in) Investing Activity, Including Discontinued Operation [Abstract]
Contribution to subsidiary	(30,000)	(11,000)	(50,000)
Net cash provided by (used in) investing activities	(30,000)	(11,000)	(50,000)
Financing activities:
Proceeds from Lines of Credit	40,000	0	0
Dividends paid	(15,782)	(13,940)	(12,954)
Proceeds from Issuance of Long-Term Debt	0	0	50,000
Repayments of Long-Term Lines of Credit	0	0	(62,000)
Debt issuance costs	0	0	(164)
Payroll taxes withheld and remitted on share-based payments	(6,281)	(7,047)	(4,282)
Common stock issued, stock options exercised	681	1,330	877
Net cash provided by (used in) financing activities	(71,380)	(29,657)	(28,523)
Net change in cash and cash equivalents	37,633	(4,746)	(17,707)
Cash and cash equivalents at beginning of period	12,336	17,082	34,789
Cash and cash equivalents at end of period	49,969	12,336	17,082
Payments for Repurchase of Common Stock	(89,998)	(10,000)	0
Accounts payable and accrued expenses	164	(41)	0
Dividends received from subsidiary	$ 105,000	$ 47,000	$ 0

Schedule II - Condensed Financial Information of Registrant, Notes (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Condensed Financial Information Disclosure [Abstract]
Interest expense	$ 10,646	$ 10,134	$ 10,301
Interest Paid, Excluding Capitalized Interest, Operating Activity	10,400	10,300	10,500
Cash dividends paid to parent company by consolidated subsidiaries			0
Repayments of Long-Term Lines of Credit	0	0	(62,000)
Proceeds from Lines of Credit	$ 40,000	$ 0	$ 0
Debt Instrument, Covenant Description	In December 2025, the covenants limiting restricted payments under the Note Purchase Agreement and Amended and Restated Credit Agreement were amended to allow the Company to make restricted payments so long as at the time of the declaration of such restricted payment, no event of default under the Note Purchase Agreement has occurred and is continuing or would arise after giving effect, on a pro forma basis, to such restricted payment if such restricted payment were to be made at such time of declaration.

Schedule V - Valuation and Qualifying Accounts (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Allowance for Premiums Receivable [Member]
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items]
Balance at beginning of period	$ 26,926	$ 13,383	$ 8,067
Additions amounts charged to expense	10,503	17,397	9,790
Deductions amounts written off or disposals	(10,101)	(3,854)	(4,474)
Balance at end of period	27,328	26,926	13,383
Valuation Allowance for Deferred Tax Assets [Member]
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items]
Balance at beginning of period	9,066	6,182	5,188
Additions amounts charged to expense	1,053	2,884	994
Deductions amounts written off or disposals	0	0	0
Balance at end of period	10,119	9,066	6,182
Allowance for Reinsurance Recoverable [Member]
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items]
Balance at beginning of period	932	744	459
Additions amounts charged to expense	140	188	285
Deductions amounts written off or disposals	0	0	0
Balance at end of period	1,072	932	744
SEC schedule, 12-09 Allowance Fixed-Maturity Securities
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items]
Balance at beginning of period	27	553	366
Additions amounts charged to expense	16	(47)	199
Deductions amounts written off or disposals	(14)	(479)	(12)
Balance at end of period	$ 29	$ 27	$ 553

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name Regulation S-X (SX)
-Number 210
-Section 12
-Subsection 09
-Paragraph Column E
-Publisher SEC

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Name Regulation S-X (SX)
-Number 210
-Section 12
-Subsection 09
-Paragraph Column D
-Publisher SEC

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Name Regulation S-X (SX)
-Number 210
-Section 12
-Subsection 09
-Paragraph Column C
-Subparagraph (1)
-Publisher SEC

Reference 4: http://www.xbrl.org/2003/role/disclosureRef
-Name Regulation S-X (SX)
-Number 210
-Section 12
-Subsection 09
-Paragraph Column C
-Subparagraph (2)
-Publisher SEC

Reference 5: http://www.xbrl.org/2003/role/disclosureRef
-Name Regulation S-X (SX)
-Number 210
-Section 12
-Subsection 09
-Paragraph Column B
-Publisher SEC

Reference 6: http://www.xbrl.org/2003/role/disclosureRef
-Topic 235
-SubTopic 10
-Name Accounting Standards Codification
-Section S50
-Paragraph 5
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480738/235-10-S50-5

Reference 7: http://www.xbrl.org/2003/role/disclosureRef
-Topic 235
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 4
-Subparagraph (SX 210.12-09(Column C)(2))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480678/235-10-S99-4

Reference 8: http://www.xbrl.org/2003/role/disclosureRef
-Topic 235
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 4
-Subparagraph (SX 210.12-09(Column C)(1))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480678/235-10-S99-4

Reference 9: http://www.xbrl.org/2003/role/disclosureRef
-Topic 235
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 4
-Subparagraph (SX 210.12-09(Column B))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480678/235-10-S99-4

Reference 10: http://www.xbrl.org/2003/role/disclosureRef
-Topic 235
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 4
-Subparagraph (SX 210.12-09(Column E))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480678/235-10-S99-4

Reference 11: http://www.xbrl.org/2003/role/disclosureRef
-Topic 235
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 4
-Subparagraph (SX 210.12-09(Column D))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480678/235-10-S99-4

+ Details