Safety Insurance (SAFT) 10-K 28 Feb 23 2022 FY Annual report Financial data

Document and Entity Information

Document and Entity Information - USD ($)	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020	Feb. 21, 2023	Jun. 30, 2022
Cover [Abstract]
Document Type	10-K
Document Annual Report	true
Document Transition Report	false
Document Period End Date	Dec. 31, 2022
Current Fiscal Year End Date	--12-31
Entity File Number	000-50070
Entity Registrant Name	SAFETY INSURANCE GROUP, INC.
Entity Incorporation, State or Country Code	DE
Entity Tax Identification Number	13-4181699
Entity Address, Address Line One	20 Custom House Street
Entity Address, City or Town	Boston
Entity Address, State or Province	MA
Entity Address, Postal Zip Code	02110
City Area Code	617
Local Phone Number	951-0600
Title of 12(b) Security	Common Shares, $0.01 par value per share
Trading Symbol	SAFT
Security Exchange Name	NASDAQ
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Well-known Seasoned Issuer	Yes
Entity Voluntary Filers	No
Entity Filer Category	Large Accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
Entity Shell Company	false
ICFR Auditor Attestation Flag	true
Entity Public Float					$ 1,370,785,946
Entity Common Stock, Shares Outstanding				14,800,434
Auditor Name	Deloitte & Touche LLP	Deloitte & Touche LLP	PricewaterhouseCoopers LLP
Auditor Location	Boston, Massachusetts	Boston, Massachusetts	Boston, Massachusetts
Auditor Firm ID	34
Entity Central Index Key	0001172052
Document Fiscal Year Focus	2022
Document Fiscal Period Focus	FY
Amendment Flag	false

Consolidated Balance Sheets

Consolidated Balance Sheets - USD ($) $ in Thousands	Dec. 31, 2022	Dec. 31, 2021
Investments:
Fixed maturities, available for sale, at fair value (amortized cost: $1,152,779 and $1,187,857, allowance for expected credit losses of $678 and $691)	$ 1,050,155	$ 1,218,279
Equity securities, at fair value (cost: $231,444 and $211,848)	240,155	264,945
Other invested assets	112,850	87,911
Total investments	1,403,160	1,571,135
Cash and cash equivalents	25,300	63,603
Accounts receivable, net of allowance for expected credit losses of $1,446 and $1,808	192,542	170,953
Receivable for securities sold	877	9,256
Accrued investment income	8,212	7,401
Taxes recoverable		1,508
Receivable from reinsurers related to paid loss and loss adjustment expenses	12,988	18,234
Receivable from reinsurers related to unpaid loss and loss adjustment expenses	93,394	90,667
Ceded unearned premiums	28,453	23,795
Deferred policy acquisition costs	75,582	73,024
Deferred income taxes	21,074
Equity and deposits in pools	33,648	33,592
Operating lease right-of-use-assets	23,336	27,115
Goodwill	17,093
Intangible assets	7,856
Other assets	29,054	27,108
Total assets	1,972,569	2,117,391
Liabilities
Loss and loss adjustment expense reserves	549,598	570,651
Unearned premium reserves	433,375	413,487
Accounts payable and accrued liabilities	73,875	76,598
Payable for securities purchased	1,359	16,477
Payable to reinsurers	11,444	9,192
Deferred income taxes		15,240
Taxes payable	1,729
Debt	35,000	30,000
Operating lease liabilities	23,336	27,115
Other liabilities	30,854	31,458
Total liabilities	1,160,570	1,190,218
Commitments and contingencies (Note 8)
Shareholders' equity
Common stock: $0.01 par value; 30,000,000 shares authorized; 17,879,095 and 17,813,370 shares issued	179	178
Additional paid-in capital	222,049	216,070
Accumulated other comprehensive (loss) income, net of taxes	(80,538)	24,579
Retained earnings	815,309	821,743
Treasury stock, at cost: 3,083,364 and 2,970,573 shares	(145,000)	(135,397)
Total shareholders' equity	811,999	927,173
Total liabilities and shareholders' equity	$ 1,972,569	$ 2,117,391

Consolidated Balance Sheets (Pa

Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands	Dec. 31, 2022	Dec. 31, 2021
Consolidated Balance Sheets
Fixed maturity securities, amortized cost	$ 1,152,779	$ 1,187,857
Fixed maturity securities, allowance for expected credit losses	678	691
Equity securities, at cost	231,444	211,848
Allowance for expected credit losses	$ 1,446	$ 1,808
Common stock par value (in dollars per share)	$ 0.01	$ 0.01
Common stock shares authorized	30,000,000	30,000,000
Common stock shares issued	17,879,095	17,813,370
Treasury stock shares	3,083,364	2,970,573

Consolidated Statements of Oper

Consolidated Statements of Operations - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Revenues
Net earned premiums	$ 758,505	$ 774,328	$ 771,078
Net investment income	46,725	44,135	41,045
Earnings from partnership investments	12,484	19,829	6,901
Net realized gains on investments	9,190	14,885	957
Change in unrealized gains on equity securities	(44,386)	16,130	10,449
Credit loss benefit (expense)	14	363	(1,054)
Commission income	566
Finance and other service income	14,461	15,241	16,872
Total revenue	797,559	884,911	846,248
Expenses
Losses and loss adjustment expenses	491,979	461,727	404,556
Underwriting, operating and related expenses	245,145	258,392	266,482
Other expense	330
Interest expense	524	522	440
Total expenses	737,978	720,641	671,478
Income before income taxes	59,581	164,270	174,770
Income tax expense	13,020	33,560	36,559
Net income	$ 46,561	$ 130,710	$ 138,211
Earnings per weighted average common share:
Basic (in dollars per share)	$ 3.17	$ 8.85	$ 9.25
Diluted (in dollars per share)	3.15	8.80	9.18
Cash dividends paid per common share (in dollars per share)	$ 3.60	$ 3.60	$ 3.60
Number of shares used in computing earnings per share:
Basic (in shares)	14,607,483	14,828,736	15,002,755
Diluted (in shares)	14,710,611	14,925,726	15,119,027

Consolidated Statements of Comp

Consolidated Statements of Comprehensive (Loss) Income - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Consolidated Statements of Comprehensive (Loss) Income
Net income	$ 46,561	$ 130,710	$ 138,211
Other comprehensive (loss) income, net of tax:
Unrealized holding (losses) gains during the period, net of income tax (benefit) expense of ($26,013), ($4,569), and $6,936 .	(97,857)	(17,189)	26,093
Reclassification adjustment for net realized gains on investments included in net income, net of income tax expense of ($1,930), ($3,126), and ($201).	(7,260)	(11,759)	(756)
Other comprehensive (loss) income , net of tax:	(105,117)	(28,948)	25,337
Comprehensive (loss) income	$ (58,556)	$ 101,762	$ 163,548

Consolidated Statements of Co_2

Consolidated Statements of Comprehensive (Loss) Income (Parenthetical) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Consolidated Statements of Comprehensive (Loss) Income.
Tax (benefit) expense on unrealized holding (losses) gains during the period	$ 26,013	$ 4,569	$ 6,936
Tax (expense) benefit on reclassification adjustment for (gains) losses included in net income	$ 1,930	$ 3,126	$ 201

Consolidated Statements of Chan

Consolidated Statements of Changes in Shareholders' Equity - USD ($) $ in Thousands	Common Stock	Additional Paid-in Capital	Accumulated Other Comprehensive (Loss) Income, Net of Taxes	Retained Earnings	Treasury Stock	Total
Balance at Dec. 31, 2019	$ 177	$ 202,321	$ 28,190	$ 661,553	$ (83,835)	$ 808,406
Net income				138,211		138,211
Unrealized gains (losses) on securities available for sale, net of deferred federal income taxes			25,337			25,337
Restricted share awards issued	1	528				529
Recognition of employee share-based compensation		6,930				6,930
Dividends paid and accrued				(54,735)		(54,735)
Acquisition of treasury stock					(39,999)	(39,999)
Balance at Dec. 31, 2020	178	209,779	53,527	745,029	(123,834)	884,679
Net income				130,710		130,710
Unrealized gains (losses) on securities available for sale, net of deferred federal income taxes			(28,948)			(28,948)
Restricted share awards issued		475				475
Recognition of employee share-based compensation		5,816				5,816
Dividends paid and accrued				(53,996)		(53,996)
Acquisition of treasury stock					(11,563)	(11,563)
Balance at Dec. 31, 2021	178	216,070	24,579	821,743	(135,397)	927,173
Net income				46,561		46,561
Unrealized gains (losses) on securities available for sale, net of deferred federal income taxes			(105,117)			(105,117)
Restricted share awards issued	1					1
Recognition of employee share-based compensation		5,979				5,979
Dividends paid and accrued				(52,995)		(52,995)
Reissuance of treasury stock					5,000	5,000
Acquisition of treasury stock					(14,603)	(14,603)
Balance at Dec. 31, 2022	$ 179	$ 222,049	$ (80,538)	$ 815,309	$ (145,000)	$ 811,999

Consolidated Statements of Cash

Consolidated Statements of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Cash flows from operating activities:
Net income	$ 46,561	$ 130,710	$ 138,211
Adjustments to reconcile net income to net cash provided by operating activities:
Investment amortization, net	1,693	4,234	6,541
Fixed asset depreciation, net	6,610	6,896	7,527
Stock based compensation	5,980	6,292	7,459
(Credit) provision for deferred income taxes	(8,371)	5,323	5,159
Net realized gains on investments	(9,190)	(14,885)	(957)
Credit loss (benefit) expense	(14)	(363)	1,054
Earnings from partnership investments	(8,388)	(13,896)	(1,932)
Change in net unrealized gains on equity securities	44,386	(16,130)	(10,449)
Changes in assets and liabilities:
Accounts receivable, net	(21,589)	8,194	14,222
Accrued investment income	(811)	644	359
Receivable from reinsurers	2,519	10,842	13,948
Ceded unearned premiums	(4,658)	(1,389)	12,776
Deferred policy acquisition costs	(2,558)	1,938	(675)
Taxes recoverable/payable	3,237	(1,229)	724
Other assets	(6,477)	(3,346)	(15)
Loss and loss adjustment expense reserves	(21,053)	3,070	(42,985)
Unearned premium reserves	19,888	(8,414)	(20,318)
Accounts payable and accrued liabilities	(2,680)	(2,876)	4,310
Payable to reinsurers	2,252	956	(4,675)
Other liabilities	(3,011)	24,823	(20,824)
Net cash provided by operating activities	44,326	141,394	109,460
Cash flows from investing activities:
Fixed maturities purchased	(215,092)	(355,561)	(217,269)
Short term investments purchased			(441)
Equity securities purchased	(52,192)	(59,296)	(49,326)
Other invested assets purchased	(20,204)	(32,814)	(11,868)
Proceeds from sales and paydowns of fixed maturities	154,491	213,665	126,555
Proceeds from maturities, redemptions, and calls of fixed maturities	86,406	144,910	86,390
Proceed from sales of equity securities	43,348	26,724	34,542
Proceeds from other invested assets redeemed	2,933	4,608	5,839
Acquisition net of cash received	(17,586)
Fixed assets purchased	(2,092)	(8,225)	(9,946)
Net cash used for investing activities	(19,988)	(65,989)	(35,524)
Cash flows from financing activities:
Proceeds from FHLB loan	5,000		30,000
Dividends paid to shareholders	(53,038)	(54,008)	(54,575)
Acquisition of treasury stock	(14,603)	(11,563)	(39,999)
Net cash used for financing activities	(62,641)	(65,571)	(64,574)
Net decrease in cash and cash equivalents	(38,303)	9,834	9,362
Cash and cash equivalents at beginning of year	63,603	53,769	44,407
Cash and cash equivalents at end of period	25,300	63,603	53,769
Supplemental disclosure of cash flow information:
Federal and state income taxes	19,119	29,190	31,080
Interest	$ 507	$ 507	$ 388

Basis of Presentation

Basis of Presentation	12 Months Ended
	Dec. 31, 2022
Basis of Presentation
Basis of Presentation	1. Basis of Presentatio n The consolidated financial statements have been prepared on the basis of accounting principles generally accepted in the United States of America (“GAAP”). The consolidated financial statements include Safety Insurance Group, Inc. and its subsidiaries (the “Company”). The subsidiaries consist of Safety Insurance Company, Safety Indemnity Insurance Company, Safety Property and Casualty Insurance Company, Safety Northeast Insurance Company, Safety Northeast Insurance Agency, Inc. (“SNIA”), and Safety Management Corporation (“SMC”), which is SNIA’s holding company. All intercompany transactions have been eliminated. The Company was incorporated on June 25, 2001 in the State of Delaware. On October 16, 2001, the Company acquired all of the issued and outstanding common stock of Thomas Black Corporation (“TBC”) and its property and casualty subsidiaries. TBC subsequently merged with and into Safety Insurance Group, Inc. with Safety Insurance Group, Inc. being the corporation surviving the merger. The Company is a leading provider of property and casualty insurance, focused primarily on the Massachusetts market. The Company’s principal product line is private passenger automobile insurance, which accounted for 52.0% of its direct written premiums in 2022. The Company primarily operates through its insurance company subsidiaries, Safety Insurance Company, Safety Indemnity Insurance Company, Safety Property and Casualty Insurance Company, and Safety Northeast Insurance Company (together referred to as the “Insurance Subsidiaries”). The Insurance Subsidiaries began writing private passenger automobile and homeowners insurance in New Hampshire during 2008, personal umbrella insurance in New Hampshire during 2009, and commercial automobile insurance in New Hampshire during 2011. The Insurance Subsidiaries began writing all of these lines of business in Maine during 2016. ​ Safety Northeast Insurance Agency, Inc., was established on December 1, 2022, when the Company acquired the assets and operations of Northeast Metrowest Insurance Agency, Inc. (“Northeast / Metrowest”), an independent insurance agency, through its wholly-owned subsidiary, SMC. SNIA provides personal and commercial property and casualty insurance products to customers on behalf of the Insurance Subsidiaries and third-party insurance carriers. The Company conducted business with Northeast / Metrowest prior to its acquisition. During the eleven months prior to December 1, 2022, all commissions paid to Northeast / Metrowest were reflected as expenses and were conducted at standard market rates. ​ As part of the purchase of SNIA, the Company paid cash, reissued treasury stock of $5,000 and incurred a contingent liability of $2,407, included in other liabilities, which is expected to be paid one year after the transaction. ​ Management has assessed and concluded that there were no conditions or events, considered in the aggregate, that raise substantial doubt about the Company’s ability to continue as a going concern within one year after the date the consolidated financial statements were issued. ​

Summary of Significant Accounti

Summary of Significant Accounting Policies	12 Months Ended
	Dec. 31, 2022
Summary of Significant Accounting Policies
Summary of Significant Accounting Policies	2. Summary of Significant Accounting Policies Investments Investments in fixed maturities, which include taxable and non- taxable bonds and redeemable preferred stocks, are reported at fair value. Fair values for fixed maturity securities are based on estimates obtained from independent pricing services. Unrealized gains or losses on fixed maturity securities reported at fair value are excluded from earnings and reported in a separate component of shareholder’s equity known as “accumulated other comprehensive income net of taxes” until realized. For fixed maturities 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 an anticipated recovery in value, the Company separates the credit loss component of the impairment from the amount related to all other factors and reports the credit loss component as credit loss expense. The impairment related to all other factors (non-credit factors) is reported in accumulated other comprehensive income. The allowance for expected credit losses is adjusted for any additional credit losses and subsequent recoveries. Upon recognizing a credit loss, the cost basis is not adjusted. See Note 3 for further details of the Company’s accounting for impairments of available-for-sale investments. Investments in equity securities, which include interests in common stocks, mutual funds and a real estate investment trust (“REIT”), are reported at fair value. Fair values for equity securities are derived from external market quotations, with the exception of the REIT whose fair value was determined using the trust’s net asset value obtained from its audited financial statements. Changes in unrealized gains or losses on equity securities are recognized in earnings. Other invested assets consist of investments in limited partnerships. The partnership interest is accounted for using the equity method of accounting and recorded in earnings from partnership investments. The carrying value of these investments are written down, or impaired, to fair value when a decline in value is considered to be other-than-temporary. In applying the equity method (including assessment for other-than-temporary impairment), the Company uses financial information provided by the investee, generally on a three month lag. Realized gains or losses on the sale or maturity of investments are determined based on the specific cost identification method. Investment income is recognized on an accrual basis of accounting. Bonds not backed by other loans are amortized using the interest method. Loan-backed bonds and structured securities are amortized using the interest method and significant changes in estimated cash flows from the original purchase assumptions are accounted for using the retrospective method. Cash and Cash Equivalents Cash and cash equivalents includes money market accounts and U.S. Treasury bills with original maturities of three months or less from the date of purchase. U.S. Treasury bills are stated at amortized cost, which approximates fair value. Accounts Receivable Amounts included in accounts receivable represent premiums as well as finance charges, the majority of which are billed on a monthly installment basis. Accounts receivable are stated net of allowances for doubtful accounts. At December 31, 2022 and 2021, these allowances were $1,446 and $1,808, respectively. Uncollected premium balances over ninety days past due are written off. Deferred Policy Acquisition Costs Amounts that vary with and are primarily related to the successful acquisition of a new or renewal insurance contract, principally commissions and premium taxes, are deferred and amortized ratably over the effective period of the policy. All other acquisition expenses are expensed as incurred. Deferred policy acquisition costs are reviewed to determine if they are recoverable from future income, and if not, are charged to expense. Future investment income attributable to related premiums is not taken into account in measuring the recoverability of the carrying value of this asset. Amortization of acquisition costs in the amount of $146,013, $146,573 and $146,955 were included in underwriting, operating and other expenses for the years ended 2022, 2021 and 2020, respectively. Equity and Deposits in Pools Equity and deposits in pools represents the net receivable amounts from the residual market mechanisms, Commonwealth Automobile Reinsurers (“CAR”) for automobile and Massachusetts Property Insurance Underwriting Association (“FAIR Plan”) for homeowners insurance in Massachusetts. See Note 11 for a discussion of the Company’s accounting for amounts assumed from residual markets. Equipment and Leasehold Improvements Property, equipment, leasehold improvements, and software which are included in other assets are carried at cost less accumulated depreciation. Depreciation is provided using the straight- line or accelerated method over the estimated useful lives of the related assets, which range from 3 to 10 years. Amortization of leasehold improvements is provided using the straight-line method over the term of the lease. The costs of computer software developed or obtained for internal use are capitalized and amortized over the estimated life of the business system, beginning when the software is ready for its intended use. Maintenance and repairs are charged to expense as incurred Business Combinations Business Combinations . Purchase consideration is allocated to the assets acquired, including customer relationship intangible assets, and liabilities assumed based on their estimated fair values at acquisition. Management estimated the fair value of such intangible assets using an income approach that considered cash flows expected to be generated by the acquired business relationships, a weighted average cost of capital discount rate reflecting the relative risk of achieving the anticipated cash flows, profits, the time value of money, and other relevant inputs. The excess of the total purchase consideration over the fair value of the identified net assets acquired is recognized as goodwill. The results of acquired businesses are included in the results of operations beginning from the date of acquisition. Acquisition related costs are expensed as incurred. During the measurement period, which may be up to one year from the acquisition date, the Company may record adjustments to the allocation of purchase consideration and to the fair values of assets acquired and liabilities assumed to the extent that additional information becomes available. After this period, any subsequent adjustments are recorded in earnings. Goodwill Goodwill generated through acquisition is carried at cost, net of impairments. Goodwill is not amortized but is reviewed for impairment at least annually or more frequently when indicators of potential impairment exist. Management first evaluates impairment of goodwill by assessing qualitative factors to determine whether it is more likely than not that the fair value of a reporting unit is less than its carrying amount. If after performing the qualitative assessment, management determines it is more likely than not that the fair value of the reporting unit is less than its carrying amount, a quantitative assessment to determine the fair value of the reporting unit. Management’s determination of the fair value of the reporting unit incorporates multiple inputs into discounted cash flow calculations, including levels of economic capital required to support the business, future business growth, earnings projections, and the weighted average cost of capital used for purposes of discounting. Goodwill is impaired up to the amount that the carrying value of the reporting unit exceeds the fair value. The Company did not recognize any goodwill impairments during the year ended December 31, 2022. Intangible Assets . The Company recognized of amortization expense annually. Intangible assets are assessed for impairment generally when events or circumstances indicate a potential impairment. If it is determined that the carrying amount of the asset is not recoverable, the asset is written down to fair value and an impairment loss is recognized. The Company did not identify any impairment indicators during the year ended December 31, 2022. Revenue Recognition Financial Services – Insurance Revenue from Contracts with Customers ​ Premiums are earned over the terms of the respective policies, which are generally one year . Unearned premiums represent the portion of premiums written applicable to the unexpired terms of the policies. ​ Ceded premiums are charged to income over the terms of the respective policies and the applicable term of the reinsurance contracts with third-party reinsurers. Ceded unearned premiums represent the unexpired portion of premiums ceded to CAR and other reinsurers. Premiums received in advance of the policy effective date are recorded as a liability and not recognized as income until earned. Such amounts are included in accounts payable and accrued liabilities and totaled $12,858 and $10,630 at December 31, 2022 and 2021, respectively. Finance and other service income primarily include revenues from premium installment charges, which are recognized when earned. Commission revenue includes new and renewal commissions paid by insurance carriers. These commissions are earned at the later of the effective date or billing date, as all rights are passed to the insured, the obligation to pay a claim resides with the insurance carrier, and no further performance obligation exists for the Company. Under the terms of its contracts with insurance carriers, the Company can earn additional, variable commission revenue in the form of annual contingent underwriting commissions (“CUC”) based on the underwriting performance of the insurance book of business. Each carrier contract and related CUC is calculated independently. Under ASC 606, the Company must estimate the amount of consideration that will be received in the coming year such that a significant reversal of revenue is not probable. As such, CUC is recognized as a contract asset as policies are issued using applicable premium and payout factors based on the estimated loss ratio from the contract. ​ Losses and Loss Adjustment Expenses Liabilities for losses and loss adjustment expenses (“LAE”) include case basis estimates for open claims reported prior to year- end and estimates of unreported claims and claim adjustment expenses, net of salvage and subrogation. The estimates are continually reviewed and modified to reflect current conditions, and any resulting adjustments are reflected in current operating results. Adjustments for anticipated salvage and subrogation are recorded on incurred and reported and incurred but not reported losses. ​ The Company determines its loss and LAE reserves estimate based upon the analysis of our actuaries. A reasonable estimate is derived by selecting a point estimate within a range of indications as calculated by our actuaries using generally accepted actuarial techniques. The key assumption in most actuarial analysis is that past patterns of frequency and severity will repeat in the future, unless a significant change in the factors described above takes place. Our key factors and resulting assumptions are the ultimate frequency and severity of claims, based upon the most recent ten years of claims reported to the Company, and the data reported to us to calculate our share of the residual market. For each accident year and each coverage within a line of business our actuaries calculate the ultimate losses incurred. ​ Reinsurance Liabilities for unearned premiums and unpaid losses are stated before deductions for ceded reinsurance. The ceded amounts are carried as receivables. Earned premiums are stated net of deductions for ceded reinsurance. The Company, as primary insurer, will be required to pay losses in their entirety in the event that the reinsurers are unable to discharge their obligations under the reinsurance agreements. Advertising Costs Advertising costs are charged to expense when they are incurred. Total advertising costs were $2,399, $2,232 and $2,311 for the years ended December 31, 2022, 2021, and 2020, respectively, and are included in underwriting, operating and related expenses. Income Taxes The Company and its subsidiaries file a consolidated U.S. federal income tax return. The method of allocation among members of the consolidated group is subject to a written agreement approved by the Board of Directors (the “Board”). The consolidated tax liability is allocated on the basis of the members’ proportionate contribution to consolidated taxable income. Deferred income taxes are generally recognized when assets and liabilities have different values for financial statement and tax reporting purposes, and for other temporary taxable and deductible differences as defined by ASC 740, Income Taxes. ​ ​ Earnings per Weighted Average Common share ​ Basic earnings per weighted average common share (“EPS”) are calculated by dividing net income by the weighted average number of basic common shares outstanding during the period. Diluted earnings per share amounts are based on the weighted average number of common shares including non-vested performance stock grants. ​ The following table sets forth the computation of basic and diluted EPS for the periods indicated. ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Years Ended December 31, ​ ​ ​ 2022 ​ ​ 2021 ​ ​ 2020 Earnings attributable to common shareholders - basic and diluted: ​ ​ ​ ​ ​ ​ ​ ​ ​ Net income from continuing operations ​ $ 46,561 ​ $ 130,710 ​ $ 138,211 Allocation for participating shares ​ ​ (205) ​ ​ 575 ​ ​ 636 Net income from continuing operations attributed to common shareholders ​ $ 46,356 ​ $ 131,285 ​ $ 138,847 Earnings per share denominator - basis and diluted ​ ​ ​ ​ ​ ​ ​ ​ ​ Total weighted average common shares outstanding, including participating shares ​ ​ 14,672,234 ​ ​ 14,894,532 ​ ​ 15,071,955 Less: weighted average participating shares ​ ​ (64,751) ​ ​ (65,796) ​ ​ (69,200) Basic earnings per share denominator ​ ​ 14,607,483 ​ ​ 14,828,736 ​ ​ 15,002,755 Common equivalent shares- non-vested performance stock grants ​ 103,128 ​ 96,990 ​ 116,272 Diluted earnings per share denominator ​ 14,710,611 ​ 14,925,726 ​ 15,119,027 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Basic earnings per share ​ $ 3.17 ​ $ 8.85 ​ $ 9.25 Diluted earnings per share ​ $ 3.15 ​ $ 8.80 ​ $ 9.18 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Undistributed earnings attributable to common shareholders - basic and diluted: ​ ​ ​ ​ ​ ​ ​ ​ ​ Net income from continuing operations attributable to common shareholders -Basic ​ $ 3.17 ​ $ 8.85 ​ $ 9.25 Dividends declared ​ ​ (3.60) ​ ​ (3.60) ​ ​ (3.60) Undistributed earnings ​ $ (0.43) ​ $ 5.25 ​ $ 5.65 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Net income from continuing operations attributable to common shareholders -Diluted ​ $ 3.15 ​ $ 8.80 ​ $ 9.18 Dividends declared ​ ​ (3.60) ​ ​ (3.60) ​ ​ (3.60) Undistributed earnings ​ $ (0.45) ​ $ 5.20 ​ $ 5.58 ​ Diluted EPS excludes non vested performance stock grants with exercise prices and exercise tax benefits greater than the average market price of the Company’s common stock during the period because their inclusion would be anti-dilutive. There were no anti-dilutive non-vested performance stock grants for the years ended December 31, 2022, 2021 and 2020. ​ Share-Based Compensation ASC 718, Compensation —Stock Compensation (“ASC 718”), requires the Company to measure and recognize the cost of employee services received in exchange for an award of equity instruments. Under the provisions of ASC 718, share-based compensation cost is measured at the grant date, based on the fair value of the award, and is recognized as an expense over the requisite service period (generally the vesting period of the equity grant). ​ See Note 7 for further information regarding share-based compensation. Use of Estimates The preparation of financial statements in conformity with GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities at the date of the financial statements and reported amounts of revenues and expenses during the reporting period. Actual results could differ from those estimates. Recent Accounting Pronouncements In December 2019, the Financial Accounting Standards Board issued Accounting Standards Update (“ASU”) 2019-12, Income Taxes (Topic 740): Simplifying the Accounting for Income Taxes ​ On March 20, 2019, the SEC adopted amendments to Regulation S-K and related rules and forms to modernize and simplify certain disclosure requirements for public companies. The amendments are intended to reduce the costs and burdens of the disclosure process and while continuing to require disclosure of all material information. The amended rules generally were effective on May 2, 2019 and reduced disclosures but some provisions added new requirements. On August 26, 2020, the SEC adopted additional amendments to Regulation S-K to modernize certain disclosure requirements relating to the description of business, legal proceedings and risk factors which are required to be disclosed in the Form 10-K. The amended rules are effective for filings on or after November 9, 2020. The adoption of the new rules did not have a material impact on the Company’s financial position, results of operations, cash flows, or disclosures. ​ In August 2018, the FASB issued ASU 2018-13, Fair Value Measurement (Topic 820): Disclosure Framework—Changes to the Disclosure Requirements for Fair Value Measurement In June 2016, the FASB issued ASU 2016-13, Financial Instruments – Credit Losses (Topic 326): Measurement of Credit Losses on Financial Statements ​ Segments independent agents and offers other personal and commercial insurance as complementary products. In accordance with ASC 280, Segment Reporting,

Investments

Investments	12 Months Ended
	Dec. 31, 2022
Investments
Investments	3. Investments ​ The gross unrealized gains and losses on investments in fixed maturity securities, including redeemable preferred stocks that have characteristics of fixed maturities, and equity securities, including interests in mutual funds, and other invested assets, were as follows for the periods indicated. ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ As of December 31, 2022 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Cost or Allowance for Gross Unrealized Estimated ​ ​ Amortized ​ Expected Credit ​ ​ ​ ​ ​ Fair ​ ​ Cost ​ Losses ​ Gains ​ Losses ​ Value U.S. Treasury securities ​ $ 1,825 ​ $ — ​ $ — ​ $ (156) ​ $ 1,669 Obligations of states and political subdivisions ​ 57,319 ​ — ​ 282 ​ (3,532) ​ 54,069 Residential mortgage-backed securities (1) ​ 259,878 ​ — ​ 385 ​ (25,761) ​ 234,502 Commercial mortgage-backed securities ​ 156,303 ​ — ​ 107 ​ (16,479) ​ 139,931 Other asset-backed securities ​ 74,160 ​ — ​ — ​ (5,429) ​ 68,731 Corporate and other securities ​ 603,294 ​ (678) ​ 740 ​ (52,103) ​ 551,253 Subtotal, fixed maturity securities ​ 1,152,779 ​ (678) ​ 1,514 ​ (103,460) ​ 1,050,155 Equity securities (2) ​ 231,444 ​ — ​ 31,857 ​ (23,146) ​ 240,155 Other invested assets (4) ​ 112,850 ​ — ​ — ​ — ​ 112,850 Totals ​ $ 1,497,073 ​ $ (678) ​ $ 33,371 ​ $ (126,606) ​ $ 1,403,160 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ As of December 31, 2021 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Cost or Allowance for Gross Unrealized Estimated ​ ​ Amortized ​ Expected Credit ​ ​ ​ ​ ​ Fair ​ ​ Cost ​ Losses ​ Gains ​ Losses (3) ​ Value U.S. Treasury securities ​ $ 318 ​ $ — ​ $ 6 ​ $ — ​ $ 324 Obligations of states and political subdivisions ​ 111,578 ​ — ​ 4,847 ​ (123) ​ 116,302 Residential mortgage-backed securities (1) ​ 237,026 ​ — ​ 5,941 ​ (1,503) ​ 241,464 Commercial mortgage-backed securities ​ 146,318 ​ — ​ 5,007 ​ (442) ​ 150,883 Other asset-backed securities ​ 83,376 ​ — ​ 475 ​ (255) ​ 83,596 Corporate and other securities ​ 609,241 ​ (691) ​ 20,647 ​ (3,487) ​ 625,710 Subtotal, fixed maturity securities ​ 1,187,857 ​ (691) ​ 36,923 ​ (5,810) ​ 1,218,279 Equity securities (2) ​ 211,848 ​ — ​ 54,861 ​ (1,764) ​ 264,945 Other invested assets (4) ​ 87,911 ​ — ​ — ​ — ​ 87,911 Totals ​ $ 1,487,616 ​ $ (691) ​ $ 91,784 ​ $ (7,574) ​ $ 1,571,135 (1) Residential mortgage-backed securities consists primarily of obligations of U.S. Government agencies including collateralized mortgage obligations issued, guaranteed and/or insured by the following issuers: Government National Mortgage Association (GNMA), Federal Home Loan Mortgage Corporation (FHLMC), Federal National Mortgage Association (FNMA) and the Federal Home Loan Bank (FHLB). (2) Equity securities include common stock, preferred stock, mutual funds and interests in mutual funds held to fund the Company’s executive deferred compensation plan. (3) The Company’s investment portfolio included 1,195 and 444 securities in an unrealized loss position at December 31, 2022 and December 31, 2021, respectively. (4) Other invested assets are accounted for under the equity method which approximates fair value. ​ The amortized cost and the estimated fair value of fixed maturity securities, by maturity, are shown below for the period indicated. Expected maturities will differ from contractual maturities because borrowers may have the right to call or prepay obligations with or without call or prepayment penalties. ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ As of December 31, 2022 ​ Amortized Estimated ​ ​ Cost ​ Fair Value Due in one year or less ​ $ 4,899 ​ $ 4,665 Due after one year through five years ​ 289,109 ​ 269,852 Due after five years through ten years ​ 328,816 ​ 296,368 Due after ten years through twenty years ​ 38,044 ​ 34,623 Due after twenty years ​ 1,570 ​ 1,483 Asset-backed securities ​ 490,341 ​ 443,164 Totals ​ $ 1,152,779 ​ $ 1,050,155 ​ ​ ​ ​ The gross realized gains and losses on sales of investments were as follows for the periods indicated. ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Years Ended December 31, ​ 2022 2021 2020 Gross realized gains ​ ​ ​ ​ ​ ​ ​ ​ ​ Fixed maturity securities ​ $ 1,511 ​ $ 3,666 ​ $ 1,645 Equity securities ​ 12,367 ​ 12,275 ​ 6,864 Gross realized losses ​ ​ ​ ​ ​ ​ ​ ​ ​ Fixed maturity securities ​ (2,987) ​ (1,036) ​ (2,166) Equity securities ​ (1,701) ​ (20) ​ (5,386) Net realized gains on investments ​ $ 9,190 ​ $ 14,885 ​ $ 957 ​ In the normal course of business, the Company enters into transactions involving various types of financial instruments, including investments in fixed maturities and equity securities. Investment transactions have credit exposure to the extent that a counter party may default on an obligation to the Company. Credit risk is a consequence of carrying, trading and investing in securities. To manage credit risk, the Company focuses on higher quality fixed income securities, reviews the credit strength of all companies in which it invests, limits its exposure in any one investment and monitors the portfolio quality, taking into account credit ratings assigned by recognized statistical rating organizations. The following tables as of December 31, 2022 and 2021 present the gross unrealized losses included in the Company’s investment portfolio and the fair value of those securities aggregated by investment category. The tables also present the length of time that they have been in a continuous unrealized loss position. ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ As of December 31, 2022 ​ ​ Less than 12 Months ​ 12 Months or More ​ Total ​ Estimated Unrealized Estimated Unrealized Estimated Unrealized ​ ​ Fair Value ​ Losses ​ Fair Value ​ Losses ​ Fair Value ​ Losses U.S. Treasury securities ​ $ 1,669 ​ $ 156 ​ $ — ​ $ — ​ $ 1,669 ​ $ 156 Obligations of states and political subdivisions ​ 34,178 ​ 2,504 ​ 3,072 ​ 1,028 ​ 37,250 ​ 3,532 Residential mortgage-backed securities ​ 140,855 ​ 12,254 ​ 70,956 ​ 13,507 ​ 211,811 ​ 25,761 Commercial mortgage-backed securities ​ 110,073 ​ 11,632 ​ 24,653 ​ 4,847 ​ 134,726 ​ 16,479 Other asset-backed securities ​ 41,113 ​ ​ 2,358 ​ ​ 27,618 ​ ​ 3,071 ​ ​ 68,731 ​ ​ 5,429 Corporate and other securities ​ 386,401 ​ 28,048 ​ 131,046 ​ 24,055 ​ 517,447 ​ 52,103 Subtotal, fixed maturity securities ​ 714,289 ​ 56,952 ​ 257,345 ​ 46,508 ​ 971,634 ​ 103,460 Equity securities ​ 116,881 ​ 21,198 ​ 6,209 ​ 1,948 ​ 123,090 ​ 23,146 Total temporarily impaired securities ​ $ 831,170 ​ $ 78,150 ​ $ 263,554 ​ $ 48,456 ​ $ 1,094,724 ​ $ 126,606 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ As of December 31, 2021 ​ ​ Less than 12 Months ​ 12 Months or More ​ Total ​ Estimated Unrealized Estimated Unrealized Estimated Unrealized ​ ​ Fair Value ​ Losses ​ Fair Value ​ Losses ​ Fair Value ​ Losses U.S. Treasury securities ​ $ — ​ $ — ​ $ — ​ $ — ​ $ — ​ $ — Obligations of states and political subdivisions ​ 2,985 ​ 85 ​ 1,012 ​ 38 ​ 3,997 ​ 123 Residential mortgage-backed securities ​ 97,116 ​ 1,502 ​ 11 ​ 1 ​ 97,127 ​ 1,503 Commercial mortgage-backed securities ​ 29,660 ​ 442 ​ — ​ — ​ 29,660 ​ 442 Other asset-backed securities ​ 39,266 ​ ​ 255 ​ ​ — ​ ​ — ​ 39,266 ​ 255 Corporate and other securities ​ 181,470 ​ 3,140 ​ 11,436 ​ 347 ​ 192,906 ​ 3,487 Subtotal, fixed maturity securities ​ 350,497 ​ 5,424 ​ 12,459 ​ 386 ​ 362,956 ​ 5,810 Equity securities ​ 19,457 ​ 1,559 ​ 1,029 ​ 205 ​ 20,486 ​ 1,764 Total temporarily impaired securities ​ $ 369,954 ​ $ 6,983 ​ $ 13,488 ​ $ 591 ​ $ 383,442 ​ $ 7,574 ​ Impairments For fixed maturities 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 an anticipated recovery in value, the Company separates the credit loss component of the impairment from the amount related to all other factors. The expected credit loss component is recognized as an allowance for expected credit losses. The allowance is adjusted for any additional credit losses and subsequent recoveries, which are booked in income as either credit loss expense or credit loss benefit, respectively. Upon recognizing a credit loss, the cost basis is not adjusted. The impairment related to all other factors (non-credit factors) is reported in other comprehensive income. ​ For fixed maturities where the Company records a credit loss, a determination is made as to the cause of the impairment and whether the Company expects a recovery in the value. For fixed maturities where the Company expects a recovery in value, the constant effective yield method is utilized, and the investment is amortized to par. ​ For fixed maturity investments the Company intends to sell or for which it is more likely than not that the Company will be required to sell before an anticipated recovery in value, the full amount of the impairment is included in credit loss expense. The new cost basis of the investment is the previous amortized cost basis less the impairment recognized in credit loss expense. The new cost basis is not adjusted for any subsequent recoveries in fair value. ​ ​ ​ As of December 31, 2022, the Company concluded that $678 of unrealized losses were due to credit factors and were recorded as an allowance for expected credit losses, compared to $691 as of December 31, 2021. The Company concluded that outside of the securities that were recognized as credit impaired, the unrealized losses recorded on the fixed maturity portfolio at December 31, 2022 and 2021 resulted from fluctuations in market interest rates and other temporary market conditions as opposed to fundamental changes in the credit quality of the issuers of such securities. Based upon the analysis performed, the Company’s decision to hold these securities, the Company’s current level of liquidity and our history of positive operating cash flows, management believes it is more likely than not that it will not be required to sell any of its securities before the anticipated recovery in the fair value to its amortized cost basis. ​ The following tables represent a reconciliation of the beginning and ending balances of the allowance for expected credit losses on fixed maturities classified as available for sale. ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Year Ended December 31, ​ ​ ​ 2022 ​ ​ 2021 Beginning of period ​ $ 691 ​ $ 1,054 Credit losses on securities with no previously recorded credit losses ​ ​ 193 ​ ​ 9 Net increases (decreases) in allowance on previously impaired securities ​ 98 ​ ​ (137) Reduction due to sales ​ ​ (304) ​ ​ (235) Writeoffs charged against allowance ​ — ​ ​ — Recoveries of amounts previously written off ​ — ​ ​ — Ending balance of period ​ $ 678 ​ $ 691 ​ Net Investment Income The components of net investment income were as follows for the periods indicated. ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Years Ended December 31, ​ 2022 2021 2020 Interest on fixed maturity securities ​ $ 40,886 ​ $ 36,160 ​ $ 37,727 Dividends on equity securities ​ 6,746 ​ 6,421 ​ 5,044 Equity in earnings of other invested assets ​ 2,304 ​ 4,895 ​ 1,378 Interest on other assets ​ 61 ​ 22 ​ 27 Total Investment Income ​ 49,997 ​ 47,498 ​ 44,176 Investment expenses ​ 3,272 ​ 3,363 ​ 3,131 Net investment income ​ $ 46,725 ​ $ 44,135 ​ $ 41,045 ​

Allowance for Expected Credit L

Allowance for Expected Credit Losses	12 Months Ended
	Dec. 31, 2022
Allowance for Expected Credit Losses
Allowance for Expected Credit Losses	4. Allowance for Expected Credit Losses ​ The Company’s financial instruments include premiums and accounts receivable, and reinsurance recoverables. ​ Premiums and accounts receivable are reported net of an allowance for expected credit losses. The allowance is based upon the Company’s ongoing review of amounts outstanding, historical loss data, including delinquencies and write-offs, current and forecasted economic conditions and other relevant factors. Credit risk is partially mitigated by the Company’s ability to cancel the policy if the policyholder does not pay the premium and the Company writes off premiums receivable balances that are more than 90 days overdue. ​ The following tables present the balances of premiums receivable, net of the allowance for expected credit losses, for the years ended December 31, 2022 and 2021, and changes in the allowance for expected credit losses for the years ended December 31, 2022 and 2021. ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ At and For the ​ ​ At and For the ​ ​ ​ Year Ended December 31, 2022 ​ ​ Year ended December 31, 2021 ​ ​ Accounts Receivable Net of Allowance for Expected Credit Losses ​ ​ Allowance for Expected Credit Losses ​ ​ Accounts Receivable Net of Allowance for Expected Credit Losses ​ ​ Allowance for Expected Credit Losses Balance, beginning of period ​ $ 170,953 ​ $ 1,808 ​ $ 179,147 ​ $ 1,754 Current period change for expected credit losses ​ ​ ​ 1,339 ​ ​ ​ 2,339 Writeoffs of uncollectable accounts receivable ​ ​ ​ (1,701) ​ ​ ​ (2,285) Balance, end of period ​ $ 192,542 ​ $ 1,446 ​ $ 170,953 ​ $ 1,808 ​ ​ Reinsurance recoverables include amounts due from reinsurers for both paid and unpaid losses. The Company cedes insurance to CAR and to other reinsurers. The Company has a property catastrophe excess of loss agreement and a casualty excess of loss agreement that qualify as reinsurance treaties and are designed to protect against large or unusual loss and LAE activity. Reinsurance contracts do not relieve the Company from its obligations to policyholders. Failure of reinsurers to honor their obligations could result in losses to the Company. The Company evaluates the financial condition of its reinsurers and monitors economic characteristics of the reinsurers to minimize its exposure to significant losses from reinsurer insolvencies. The Company reports its reinsurance recoverables net of an allowance for estimated uncollectable reinsurance. A probability-of-default methodology which reflects current and forecasted economic conditions is used to estimate the amount of uncollectible reinsurance due to credit-related factors and the estimate is reported in an allowance for estimated uncollectible reinsurance. Amounts deemed to be uncollectible, including amounts due from known insolvent reinsurers, are written off against the allowance. Changes in the allowance, as well as any subsequent collections of amounts previously written off, are reported as part of claims and claim adjustment expenses. ​ The majority of the Company’s reinsurance recoverable on paid and unpaid losses is a result of our participation as a servicing carrier in the CAR Commercial Automobile Program, which represents 94% of the total reinsurance recoverable on paid and unpaid losses at December 31, 2022 and 2021, respectively. The remaining 6% of amounts due from reinsurers are related to our other excess of loss and quota share contracts. For amounts due under these contracts, the Company utilizes updated A.M. Best credit ratings on a quarterly basis to determine the allowance for expected credit losses. As of December 31, 2022 and 2021, all reinsurers under these programs are rated “A” or better by A.M. Best. Certain of the Company's reinsurance recoverables are collateralized by letters of credit, funds held or trust agreements. The Company’s analysis concludes that there are no expected credit losses at December 31, 2022 or 2021.

Equipment and Leasehold Improve

Equipment and Leasehold Improvements	12 Months Ended
	Dec. 31, 2022
Equipment and Leasehold Improvements
Equipment and Leasehold Improvements	5. Equipment and Leasehold Improvements The carrying value of equipment and leasehold improvements by classification was as follows for the periods indicated. Equipment and leasehold improvements are included in other assets in the consolidated balance sheets. ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ As of December 31, ​ ​ 2022 ​ 2021 Software $ 58,079 $ 57,463 Computer equipment ​ 15,649 ​ 15,425 Leasehold improvements ​ 8,264 ​ 8,264 Other equipment ​ 3,132 ​ 3,132 Furniture and fixtures ​ 4,346 ​ 4,346 Total cost ​ 89,470 ​ 88,630 Less accumulated depreciation and amortization ​ 71,342 ​ 65,188 Equipment and leasehold improvements, net ​ $ 18,128 ​ $ 23,442 ​

Employee Benefit Plan

Employee Benefit Plan	12 Months Ended
	Dec. 31, 2022
Employee Benefit Plan
Employee Benefit Plan	6. Employee Benefit Plan The Company sponsors the Safety Insurance Company 401(k) qualified defined contribution retirement plan (the “Retirement Plan”). The Retirement Plan is available to all eligible employees of the Company. An employee must be 21 years tax basis up to the maximum allowed under federal law. The Retirement Plan is administered by the Company and is subject to the provisions of the Employee Retirement Income Security Act of 1974. At the close of each Retirement Plan year, the Company makes a matching contribution equal to of the participant’s base salary, to those participants who have contributed to the Retirement Plan and were employed on the last day of the Retirement Plan year. Compensation expense related to the Retirement Plan was and 2020, respectively. ​

Share-Based Compensation

Share-Based Compensation	12 Months Ended
	Dec. 31, 2022
Share-Based Compensation
Share-Based Compensation	7. Share-Based Compensation 2018 Long Term Incentive Plan ​ On March 24, 2022, the Company’s Board of Directors adopted the Amended and Restated Safety Insurance Group, Inc. 2018 Long-Term Incentive Plan (“the Amended 2018 Plan”), which was subsequently approved by our shareholders at the 2022 Annual Meeting of Shareholders. The Amended 2018 Plan increases the share pool limit by adding common shares to the previously adopted Safety Insurance Group, Inc. 2018 Long-Term Incentive Plan. The Amended 2018 Plan enables the grant of stock awards, performance shares, cash-based performance units, other stock-based awards, stock options, stock appreciation rights, and stock unit awards, each of which may be granted separately or in tandem with other awards. Eligibility to participate includes officers, directors, employees and other individuals who provide bona fide services to the Company. The Amended 2018 Plan supersedes the Company’s 2002 Management Omnibus Incentive Plan (“the 2002 Incentive Plan”). ​ The Amended 2018 Plan establishes a pool of 700,000 shares of common stock available for issuance to our employees and other eligible participants. The Board of Directors and the Compensation Committee intend to issue awards under the Amended 2018 Plan in the future. ​ The maximum number of shares of common stock between the Amended 2018 Plan and the 2002 Incentive Plan with respect to which awards may be granted is 3,200,000 . further grants will be allowed under the 2002 Incentive Plan. At December 31, 2022, there were ​ ​ Restricted Stock Service-based restricted stock awarded in the form of unvested shares is recorded at the market value of the Company’s common stock on the grant date and amortized ratably as compensation expense over the requisite service period. Service-based restricted stock awards generally vest over a second service period and independent directors’ stock awards which vest immediately. Our independent directors are subject to stock ownership guidelines, which require them to have a value equal to four times their annual cash retainer. ​ In addition to service-based awards, the Company grants performance-based restricted shares to certain employees. These performance shares cliff vest after a three-year performance period provided certain performance measures are attained. A portion of these awards, which contain a market condition, vest according to the level of total shareholder return achieved by the Company compared to its property-casualty insurance peers over a three-year period. The remainder, which contain a performance condition, vest according to the level of Company’s combined ratio results compared to a target based on its property-casualty insurance peers. ​ Actual payouts can range from 0% to 200% of target shares awarded depending upon the level of achievement of the respective market and performance conditions during a three calendar-year performance period. Compensation expense for share awards with a performance condition is based on the probable number of awards expected to vest using the performance level most likely to be achieved at the end of the performance period. ​ Performance-based awards with market conditions are accounted for and measured differently from awards that have a performance or service condition. The effect of a market condition is reflected in the award’s fair value on the grant date. That fair value is recognized as compensation cost over the requisite service period regardless of whether the market-based performance objective has been satisfied. ​ All of the Company’s restricted stock awards are issued as incentive compensation and are equity classified. ​ The following table summarizes restricted stock activity under the Amended 2018 Plan assuming a target payout for the performance-based shares. ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Years Ended December 31, ​ ​ 2022 ​ 2021 ​ 2020 ​ Shares Weighted ​ Shares Weighted Shares ​ Weighted ​ ​ Under ​ Average ​ Under ​ Average Under ​ Average ​ ​ Restriction ​ Fair Value ​ Restriction ​ Fair Value Restriction ​ Fair Value Outstanding at beginning of year 65,171 ​ $ 84.30 ​ 66,550 ​ $ 85.16 ​ 78,202 ​ $ 79.09 Granted 38,864 ​ ​ 85.22 ​ 39,840 ​ ​ 79.27 ​ 34,799 ​ ​ 90.10 Vested and unrestricted (38,328) ​ ​ 86.02 ​ (40,763) ​ ​ 80.82 ​ (43,757) ​ ​ 78.10 Forfeited ​ (2,294) ​ ​ 83.10 ​ (456) ​ ​ 81.17 ​ (2,694) ​ ​ 87.70 Outstanding at end of period 63,413 ​ $ 83.87 ​ 65,171 ​ $ 84.30 ​ 66,550 ​ $ 85.16 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Years Ended December 31, ​ ​ 2022 ​ 2021 ​ 2020 ​ Performance-based Weighted Performance-based Weighted Performance-based ​ Weighted ​ ​ Shares Under ​ Average ​ Shares Under ​ Average ​ Shares Under ​ Average ​ ​ Restriction ​ Fair Value ​ Restriction ​ Fair Value ​ Restriction ​ Fair Value Outstanding at beginning of year 72,418 ​ $ 86.53 71,964 ​ $ 84.94 ​ 84,105 ​ $ 79.34 Granted (1) 31,828 ​ ​ 86.35 49,460 ​ ​ 77.56 ​ 36,649 ​ ​ 84.68 Vested and unrestricted (26,504) ​ ​ 92.52 (48,666) ​ ​ 75.05 ​ (42,123) ​ ​ 73.55 Forfeited ​ (2,673) ​ ​ 83.01 ​ (340) ​ ​ 87.43 ​ (6,667) ​ ​ 84.86 Outstanding at end of period 75,069 ​ $ 84.46 72,418 ​ $ 86.53 ​ 71,964 ​ $ 84.94 ​ (1) Includes a true-up of previously awarded performance-based restricted share awards. The updated shares were calculated based on the attainment of pre-established performance objectives. ​ ​ ​ ​ ​ As of December 31, 2022, there was

Commitments and Contingencies

Commitments and Contingencies	12 Months Ended
	Dec. 31, 2022
Commitments and Contingencies
Commitments and Contingencies	8. Commitments and Contingencies Commitments ​ ​ As part of the Company’s investment activity, we have committed $160,000 to investments in limited partnerships. The Company has contributed ​ Contingencies Various claims, generally incidental to the conduct of normal business, are pending or alleged against the Company from time to time. In the opinion of management, based in part on the advice of legal counsel, the ultimate resolution of such claims will not have a material adverse effect on the Company’s consolidated financial statements. However, if estimates of the ultimate resolutions of those proceedings are revised, liabilities related to those proceedings could be adjusted in the near term. The Company had been named in a lawsuit alleging that the Company improperly denied coverage to commercial insureds for loss of business income resulting from the COVID-19 pandemic. Our position is that no coverage existed for this peril. As a result of the lawsuit, the Company accrued a reserve of for legal defense costs included in Loss and Losses Adjustment Expenses during the year ended December 31, 2021. During the year ended December 31, 2022, the claim against the Company was closed and the accrual of ​ On October 19, 2021, the Supreme Judicial Court of Massachusetts (the “Court”) unanimously ruled that property and casualty insurers must compensate third-party claimants under property damage coverage, part 4 of the standard Massachusetts automobile insurance policy, 2008 edition (standard policy), for the inherent diminished value (“IDV”) that occurs when their vehicles are damaged in a crash. This ruling overturned a previous decision by the Massachusetts Superior Court, which found that a Massachusetts auto insurance policy did not provide property damage coverage for inherent diminished value damages for third-party claimants. The Court placed the burden of proof on the individual claimant by explicitly specifying that the claimant must establish that the vehicle has suffered IDV damages and also the amount of IDV damages at issue. The Court further ruled that an insurer’s previous denial of coverage for such damages could not serve as the basis for a claim of unfair business practices. Based on the Court’s rulings, at this time the Company does not expect any claims for IDV damages to be material, and therefore has not accrued for a specific loss contingency.

Leases

Leases	12 Months Ended
	Dec. 31, 2022
Leases
Leases	​ 9. Leases ​ The Company has various non-cancelable, long-term operating leases, the largest of which are for office space including the corporate headquarters, agency locations, VIP claims centers and law offices. Other operating leases consist of auto leases and various office equipment. The Company has no finance leases. Our leases have remaining lease terms of Certain lease agreements contain renewal options and, in addition to the minimum annual rentals, generally provide for payment of a share of the real estate taxes and operating expenses in excess of a base amount. Rental expense for our office space, law offices and VIP claims centers was $3,948, $3,852 and $3,477 for the years ended December 31, 2022, 2021, and 2020, respectively. All leases expire prior to 2029. The Company expects that in the normal course of business, leases that expire will be renewed. ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Year Ended December 31, ​ ​ 2022 ​ ​ 2021 ​ ​ 2020 Operating lease cost ​ ​ $ 4,214 ​ $ 4,464 ​ $ 4,591 ​ ​ ​ Other information related to leases was as follows: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Year Ended December 31, ​ ​ 2022 ​ ​ 2021 ​ ​ 2020 Cash paid for amounts included in the measurement of lease liabilities: ​ ​ ​ ​ ​ ​ ​ ​ ​ Operating cash flows from operating leases ​ $ 4,757 ​ $ 4,979 ​ $ 5,073 Weighted average remaining lease term ​ ​ ​ ​ ​ ​ ​ ​ ​ Operating leases ​ ​ 5.75 Years ​ ​ 6.65 Years ​ ​ 7.57 Years Weighted average discount rate ​ ​ ​ ​ ​ ​ ​ ​ ​ Operating leases ​ ​ 2.39% ​ ​ 2.34% ​ ​ 2.33% ​ ​ ​ Maturities of lease liabilities were as follows: ​ ​ ​ ​ ​ ​ Operating Leases 2023 ​ $ 4,521 2024 ​ ​ 4,269 2025 ​ ​ 3,867 2026 ​ ​ 3,857 2027 ​ ​ 3,857 Thereafter ​ ​ 3,860 Total lease payments ​ ​ 24,231 Less imputed interest ​ ​ (895) Total ​ $ 23,336 ​

Debt

Debt	12 Months Ended
	Dec. 31, 2022
Debt
Debt	​ 10. Debt On August 10, 2018, the Company extended its Revolving Credit Agreement (the “Credit Agreement”) with Citizens Bank, N.A. (formerly known as RBS Citizens, N.A. (“Citizens Bank”)) to a maturity date of August 10, 2023. The Credit Agreement provides a $30,000 revolving credit facility with an accordion feature allowing for future expansion of the committed amount up to $50,000 . Loans under the credit facility bear interest at the Company’s option at either (i) the ​ The Company’s obligations under the credit facility are secured by pledges of its assets and the capital stock of its operating subsidiaries. The credit facility is guaranteed by the Company’s non-insurance company subsidiaries. The credit facility contains covenants including requirements to maintain minimum risk-based capital ratios and statutory surplus of Safety Insurance Company as well as limitations or restrictions on indebtedness, liens, and other matters. As of December 31, 2022, the Company was in compliance with all covenants. In addition, the credit facility includes customary events of default, including a cross-default provision permitting the lenders to accelerate the facility if the Company (i) defaults in any payment obligation under debt having a principal amount in excess of $10,000 or (ii) fails to perform any other covenant permitting acceleration of all such debt. The Company had no amounts outstanding on its credit facility at December 31, 2022 or 2021. The credit facility commitment fee included in interest expense was computed at a rate of ​ The Company is a member of the FHLB-Boston. Membership in the FHLB-Boston allows the Company to borrow money at competitive interest rates provided the loan is collateralized by specific U.S Government residential mortgage backed securities. At December 31, 2022, the Company has the ability to borrow approximately ​ On March 17, 2020, the Company borrowed $30,000 from the FHLB-Boston for a term of five-years, bearing interest at a rate of 1.42%. Interest is payable monthly and the principal is due on the maturity date of March 17, 2025 but may be prepaid in whole or in part by the Company in advance with a minor penalty for prepayment. ​ On December 29, 2022, the Company borrowed $5,000 from the FHLB-Boston for a term of one-month, bearing interest at a rate of 4.34% . The interest and principal was paid on the maturity date of January 27, 2023. ​ The Company estimates the fair value of the FHLB-Boston loans by discounting cash flows using the interest rate stated in the loan agreements, which is an observable input. As such, the loans are categorized as Level 2 within the fair value hierarchy. The fair value of the outstanding loans was at December 31, 2022 and 2021, respectively. The loans are fully collateralized by specific U.S. Government residential mortgage-backed securities with a fair value of ​ Interest expense on the FHLB-Boston borrowing was $524 and $522 for the year ended December 31, 2022 and 2021, respectively.

Reinsurance

Reinsurance	12 Months Ended
	Dec. 31, 2022
Reinsurance
Reinsurance	​ 11. Reinsurance ​ The Company cedes insurance to CAR and to other reinsurers. The Company has various excess of loss and quota share agreements that qualify as reinsurance treaties and are designed to protect against large or unusual loss and LAE activity. Reinsurance contracts do not relieve the Company from its obligations to policyholders. Failure of reinsurers to honor their obligations could result in losses to the Company. The Company evaluates the financial condition of its reinsurers and monitors economic characteristics of the reinsurers to minimize its exposure to significant losses from reinsurer insolvencies. The Company is subject to concentration of credit risk with respect to reinsurance ceded. At December 31, 2022, reinsurance receivables on paid and unpaid loss and LAE with a carrying value of $99,688 and ceded unearned premiums of $26,377 were associated with CAR. At December 31, 2021, reinsurance receivables on paid and unpaid loss and LAE with a carrying value of $106,608 and ceded unearned premiums of $21,841 were associated with CAR. The Company assumes a proportionate share of the obligations from CAR. The Company makes an estimate of its share of assumed activity from the most recent quarter reported by CAR and records adjustments to the reported activity to reflect its anticipated final assumed obligations. The Company’s participation in CAR resulted in assumed net losses of $3,326, $5,002 and $3,480 for the years ended December 31, 2022, 2021 and 2020, respectively. ​ CAR has been, with few exceptions, required by law to issue a policy to any applicant who seeks it. As a servicing carrier of CAR, this requirement has applied to the Company. ​ The effect of assumed and ceded premiums on net written and earned premiums and losses and LAE incurred is as follows. ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Years Ended December 31, ​ 2022 2021 2020 Written Premiums ​ ​ ​ ​ ​ ​ ​ ​ ​ Direct ​ $ 823,318 ​ $ 802,139 ​ $ 798,712 Assumed ​ 28,835 ​ 31,359 ​ 26,316 Ceded ​ (78,418) ​ (68,972) ​ (61,491) Net written premiums ​ $ 773,735 ​ $ 764,526 ​ $ 763,537 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Earned Premiums ​ ​ ​ ​ ​ ​ ​ ​ ​ Direct ​ $ 803,289 ​ $ 811,329 ​ $ 815,981 Assumed ​ 28,976 ​ 30,583 ​ 29,365 Ceded ​ (73,760) ​ (67,584) ​ (74,268) Net earned premiums ​ $ 758,505 ​ $ 774,328 ​ $ 771,078 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Loss and LAE ​ ​ ​ ​ ​ ​ ​ ​ ​ Direct ​ $ 515,535 ​ $ 473,162 ​ $ 428,018 Assumed ​ 18,627 ​ 16,873 ​ 18,595 Ceded ​ (42,183) ​ (28,308) ​ (42,057) Net loss and LAE ​ $ 491,979 ​ $ 461,727 ​ $ 404,556 ​

Loss and Loss Adjustment Expens

Loss and Loss Adjustment Expense Reserves	12 Months Ended
	Dec. 31, 2022
Loss and Loss Adjustment Expense Reserves
Loss and Loss Adjustment Expense Reserves	​ 12. Loss and Loss Adjustment Expense Reserves The following table sets forth a reconciliation of beginning and ending reserves for losses and loss adjustment expenses (“LAE”), as shown in the Company’s consolidated financial statements for the periods indicated. ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Year Ended December 31, ​ 2022 2021 ​ 2020 Reserves for losses and LAE at beginning of year ​ $ 570,651 ​ $ 567,581 ​ $ 610,566 Less receivable from reinsurers related to unpaid losses and LAE ​ (90,667) ​ (106,311) ​ ​ (122,372) Net reserves for losses and LAE at beginning of year ​ 479,984 ​ 461,270 ​ ​ 488,194 Incurred losses and LAE, related to: ​ ​ ​ ​ ​ ​ ​ ​ ​ Current year ​ 549,258 ​ 515,400 ​ ​ 459,400 Prior years ​ (57,279) ​ (53,673) ​ ​ (54,844) Total incurred losses and LAE ​ 491,979 ​ 461,727 ​ ​ 404,556 Paid losses and LAE related to: ​ ​ ​ ​ ​ ​ ​ ​ ​ Current year ​ 342,971 ​ 310,116 ​ ​ 277,754 Prior years ​ 172,788 ​ 132,897 ​ ​ 153,726 Total paid losses and LAE ​ 515,759 ​ 443,013 ​ ​ 431,480 Net reserves for losses and LAE at end of period ​ 456,204 ​ 479,984 ​ ​ 461,270 Plus receivable from reinsurers related to unpaid losses and LAE ​ 93,394 ​ 90,667 ​ ​ 106,311 Reserves for losses and LAE at end of period ​ $ 549,598 ​ $ 570,651 ​ $ 567,581 ​ At the end of each period, the reserves were re-estimated for all prior accident years. The Company’s prior year reserves decreased by $57,279, $53,673, and $54,844, for the years ended December 31, 2022, 2021, and 2020, respectively, and resulted from re-estimations of prior years’ ultimate loss and LAE liabilities. The decrease in prior year reserves during 2022 was primarily composed of reductions of $20,241 in the Company’s retained automobile and $32,963 in the Company’s retained other than auto and homeowners reserves. The decrease in prior year reserves during 2021 was primarily composed of reductions of $22,313 in the Company’s retained automobile and $26,220 in the Company’s retained other than auto and homeowners reserves. The decrease in prior year reserves during 2020 was primarily composed of reductions of $26,902 in the Company’s retained automobile and $21,717 in the Company’s retained homeowners reserves. The Company’s private passenger automobile line of business prior year reserves decreased during the years ended December 31, 2022, 2021 and 2020 primarily due to improved retained private passenger results. The improved retained private passenger results were primarily due to fewer incurred but not yet reported claims than previously estimated and better than previously estimated severity on the Company’s established bodily injury and property damage case reserves. The following is information about incurred and paid claims development as of December 31, 2022, net of reinsurance, as well as cumulative claim frequency and the total of incurred-but-not-reported liabilities plus expected development on reported claims included within the net incurred claims amounts for our three largest lines of business. The cumulative number of reported claims include claims closed with payment, claims closed without payment and all open claims. It does not include anticipated IBNR claims. For the Private Passenger Automobile and Commercial Automobile lines of business, claim count is defined on a claimant basis where several claim counts may arise from a single auto accident. For Homeowners and all other lines of business, claim count is defined on an accident basis. ​ The information about incurred claims and allocated claim adjustment expense, net of reserves and paid ultimate claims development for the years ended December 31, 2013 to 2021 is presented as required supplementary information. ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Private Passenger Automobile Liability ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance ​ ​ ​ ​ ​ ​ ​ As of December 31, 2022 ​ ​ ​ ​ For the Years Ended December 31, ​ ​ ​ Total of Incurred-but-Not-Reported Liabilities Plus Expected Development of Reported Claims Cumulative Number of Reported Claims Accident Year ​ 2013 ​ 2014 ​ 2015 ​ 2016 ​ 2017 ​ 2018 ​ 2019 ​ 2020 ​ 2021 ​ 2022 ​ ​ ​ ​ ​ (Unaudited) ​ ​ ​ ​ ​ ​ ​ 2013 ​ $ 183,367 ​ $ 183,517 ​ $ 183,264 ​ $ 181,492 ​ $ 179,167 ​ $ 176,713 ​ $ 175,684 ​ $ 175,718 ​ $ 175,362 ​ $ 175,374 ​ ($ 84) 54,248 2014 ​ ​ ​ 187,305 ​ 187,104 ​ 186,798 ​ 183,119 ​ 181,312 ​ 179,251 ​ 179,267 ​ 179,268 ​ 179,264 ​ (336) 52,787 2015 ​ ​ ​ ​ ​ 190,036 ​ 190,236 ​ 188,317 ​ 184,477 ​ 181,299 ​ 179,451 ​ 179,248 ​ 178,951 ​ (204) 52,980 2016 ​ ​ ​ ​ ​ ​ ​ 192,912 ​ 192,318 ​ 185,009 ​ 180,486 ​ 177,009 ​ 176,600 ​ 176,700 ​ (392) 49,386 2017 ​ ​ ​ ​ ​ ​ ​ ​ ​ 185,673 ​ 184,429 ​ 182,068 ​ 177,941 ​ 177,320 ​ 176,564 ​ (1,723) 46,257 2018 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ 176,411 ​ 175,222 ​ 170,447 ​ 168,185 ​ 166,046 ​ (3,040) 43,085 2019 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ 176,171 ​ 174,439 ​ 170,477 ​ 166,940 ​ (4,648) 40,564 2020 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ 130,335 ​ 125,888 ​ 120,060 ​ (5,880) 26,172 2021 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ 146,997 ​ 147,391 ​ (18,015) 29,994 2022 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ 157,921 ​ 2,617 27,388 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Total ​ $ 1,645,211 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Private Passenger Automobile Liability ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ For the Years Ended December 31, ​ ​ ​ Accident Year ​ 2013 ​ 2014 ​ 2015 ​ 2016 ​ 2017 ​ 2018 ​ 2019 ​ 2020 ​ 2021 ​ 2022 ​ ​ ​ (Unaudited) ​ ​ ​ ​ ​ 2013 ​ $ 79,049 ​ $ 135,031 ​ $ 152,472 ​ $ 163,694 ​ $ 169,634 ​ $ 172,736 ​ $ 173,890 ​ $ 174,574 ​ $ 174,639 ​ $ 174,858 ​ 2014 ​ ​ ​ 79,151 ​ 136,434 ​ 156,693 ​ 166,815 ​ 173,163 ​ 176,616 ​ 177,360 ​ 177,968 ​ 178,324 ​ 2015 ​ ​ ​ ​ ​ 76,934 ​ 138,255 ​ 156,483 ​ 168,641 ​ 173,816 ​ 176,652 ​ 177,782 ​ 178,357 ​ 2016 ​ ​ ​ ​ ​ ​ ​ 78,862 ​ 137,917 ​ 154,964 ​ 167,458 ​ 171,865 ​ 174,410 ​ 175,803 ​ 2017 ​ ​ ​ ​ ​ ​ ​ ​ ​ 77,519 ​ 133,037 ​ 153,675 ​ 164,467 ​ 169,024 ​ 172,362 ​ 2018 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ 72,895 ​ 126,456 ​ 143,656 ​ 154,169 ​ 159,066 ​ 2019 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ 72,219 ​ 127,910 ​ 143,570 ​ 154,633 ​ 2020 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ 52,962 ​ 88,037 ​ 102,601 ​ 2021 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ 56,826 ​ 111,516 ​ 2022 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ 61,227 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Total ​ $ 1,468,747 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ All outstanding liabilities before 2013, net of reinsurance ​ 346 ​ ​ ​ ​ ​ ​ ​ Liabilities for claims and claim adjustment expenses, net of reinsurance ​ $ 176,810 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Private Passenger Automobile Physical Damage ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance ​ ​ ​ ​ ​ ​ ​ As of December 31, 2022 ​ ​ ​ ​ For the Years Ended December 31, ​ ​ ​ Total of Incurred-but-Not-Reported Liabilities Plus Expected Development of Reported Claims Cumulative Number of Reported Claims Accident Year ​ 2013 ​ 2014 ​ 2015 ​ 2016 ​ 2017 ​ 2018 ​ 2019 ​ 2020 ​ 2021 ​ 2022 ​ ​ ​ ​ ​ (Unaudited) ​ ​ ​ ​ ​ ​ ​ 2013 ​ $ 114,389 ​ $ 114,239 ​ $ 113,034 ​ $ 112,197 ​ $ 112,096 ​ $ 112,060 ​ $ 112,029 ​ $ 112,003 ​ $ 111,989 ​ $ 111,970 ​ $ - 131,703 2014 ​ ​ ​ 123,421 ​ 123,622 ​ 122,410 ​ 122,327 ​ 122,341 ​ 122,213 ​ 122,188 ​ 122,182 ​ 122,163 ​ - 135,006 2015 ​ ​ ​ ​ ​ 140,219 ​ 136,661 ​ 134,101 ​ 133,737 ​ 133,581 ​ 133,530 ​ 133,523 ​ 133,552 ​ (3) 144,276 2016 ​ ​ ​ ​ ​ ​ ​ 129,528 ​ 124,922 ​ 122,116 ​ 121,717 ​ 121,543 ​ 121,570 ​ 121,615 ​ (5) 126,091 2017 ​ ​ ​ ​ ​ ​ ​ ​ ​ 128,340 ​ 126,304 ​ 124,128 ​ 123,715 ​ 123,777 ​ 123,779 ​ (35) 124,026 2018 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ 129,450 ​ 130,145 ​ 128,426 ​ 128,090 ​ 128,003 ​ (63) 119,760 2019 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ 128,698 ​ 126,648 ​ 124,332 ​ 123,858 ​ (116) 117,022 2020 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ 98,546 ​ 97,244 ​ 97,644 ​ (451) 81,852 2021 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ 122,943 ​ 122,549 ​ (1,379) 89,521 2022 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ 141,041 ​ (23,926) 92,198 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Total ​ $ 1,226,174 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Private Passenger Automobile Physical Damage ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ For the Years Ended December 31, ​ ​ Accident Year ​ 2013 ​ 2014 ​ 2015 ​ 2016 ​ 2017 ​ 2018 ​ 2019 ​ 2020 ​ 2021 ​ 2022 ​ ​ (Unaudited) ​ ​ ​ ​ 2013 ​ $ 120,843 ​ $ 115,904 ​ $ 112,894 ​ $ 112,162 ​ $ 112,085 ​ $ 112,060 ​ $ 112,029 ​ $ 112,003 ​ $ 111,988 ​ $ 111,970 2014 ​ ​ ​ 130,732 ​ 126,414 ​ 122,668 ​ 122,402 ​ 122,350 ​ 122,251 ​ 122,216 ​ 122,189 ​ 122,163 2015 ​ ​ ​ ​ ​ 143,532 ​ 136,760 ​ 134,066 ​ 133,701 ​ 133,639 ​ 133,596 ​ 133,575 ​ 133,555 2016 ​ ​ ​ ​ ​ ​ ​ 133,530 ​ 124,298 ​ 122,023 ​ 121,795 ​ 121,660 ​ 121,634 ​ 121,618 2017 ​ ​ ​ ​ ​ ​ ​ ​ ​ 132,409 ​ 126,822 ​ 124,286 ​ 123,844 ​ 123,839 ​ 123,795 2018 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ 138,036 ​ 132,591 ​ 128,624 ​ 128,154 ​ 128,054 2019 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ 134,429 ​ 128,173 ​ 124,467 ​ 123,974 2020 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ 102,764 ​ 98,819 ​ 98,083 2021 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ 123,636 ​ 123,847 2022 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ 142,002 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Total ​ $ 1,229,061 ​ ​ ​ ​ ​ ​ ​ ​ ​ All outstanding liabilities before 2013, net of reinsurance ​ - ​ ​ ​ ​ ​ ​ Liabilities for claims and claim adjustment expenses, net of reinsurance ​ ($ 2,887) ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Commercial Automobile Liability ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance ​ ​ ​ ​ ​ ​ ​ As of December 31, 2022 ​ ​ ​ ​ For the Years Ended December 31, ​ ​ ​ Total of Incurred-but-Not-Reported Liabilities Plus Expected Development of Reported Claims Cumulative Number of Reported Claims Accident Year ​ 2013 ​ 2014 ​ 2015 ​ 2016 ​ 2017 ​ 2018 ​ 2019 ​ 2020 ​ 2021 ​ 2022 ​ ​ ​ ​ ​ (Unaudited) ​ ​ ​ ​ ​ ​ ​ 2013 ​ $ 29,175 ​ $ 29,541 ​ $ 28,377 ​ $ 26,864 ​ $ 26,310 ​ $ 25,986 ​ $ 25,443 ​ $ 25,353 ​ $ 25,140 ​ $ 25,052 ​ $ 1 5,784 2014 ​ ​ ​ 34,117 ​ 34,105 ​ 34,376 ​ 33,914 ​ 32,948 ​ 32,438 ​ 32,200 ​ 32,052 ​ 32,313 ​ 2 6,086 2015 ​ ​ ​ ​ ​ 35,371 ​ 36,150 ​ 36,610 ​ 37,730 ​ 38,015 ​ 38,257 ​ 37,995 ​ 37,630 ​ (62) 7,212 2016 ​ ​ ​ ​ ​ ​ ​ 37,954 ​ 39,416 ​ 40,947 ​ 40,916 ​ 40,679 ​ 40,996 ​ 40,767 ​ 56 6,457 2017 ​ ​ ​ ​ ​ ​ ​ ​ ​ 42,865 ​ 41,373 ​ 41,055 ​ 39,369 ​ 39,232 ​ 38,185 ​ (6) 6,134 2018 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ 41,347 ​ 40,115 ​ 38,589 ​ 37,322 ​ 36,014 ​ 107 5,744 2019 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ 51,679 ​ 49,163 ​ 48,783 ​ 46,964 ​ 666 5,682 2020 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ 35,010 ​ 31,930 ​ 30,869 ​ 2,867 3,463 2021 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ 41,814 ​ 39,564 ​ 229 4,260 2022 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ 43,496 ​ 12,054 3,893 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Total ​ $ 370,854 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Commercial Automobile Liability ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ For the Years Ended December 31, ​ ​ Accident Year ​ 2013 ​ 2014 ​ 2015 ​ 2016 ​ 2017 ​ 2018 ​ 2019 ​ 2020 ​ 2021 ​ 2022 ​ ​ (Unaudited) ​ ​ ​ ​ 2013 ​ $ 8,502 ​ $ 17,079 ​ $ 19,625 ​ $ 21,129 ​ $ 22,434 ​ $ 23,867 ​ $ 24,507 ​ $ 24,732 ​ $ 24,789 ​ $ 24,799 2014 ​ ​ ​ 9,426 ​ 17,853 ​ 21,968 ​ 25,253 ​ 27,886 ​ 30,420 ​ 31,298 ​ 31,451 ​ 32,085 2015 ​ ​ ​ ​ ​ 11,181 ​ 21,700 ​ 26,018 ​ 29,804 ​ 31,537 ​ 33,416 ​ 34,976 ​ 35,302 2016 ​ ​ ​ ​ ​ ​ ​ 9,991 ​ 19,902 ​ 25,711 ​ 32,274 ​ 36,237 ​ 38,275 ​ 39,233 2017 ​ ​ ​ ​ ​ ​ ​ ​ ​ 10,407 ​ 20,106 ​ 24,409 ​ 28,721 ​ 31,389 ​ 33,569 2018 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ 9,704 ​ 18,499 ​ 23,544 ​ 26,774 ​ 29,336 2019 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ 12,113 ​ 22,480 ​ 28,373 ​ 36,048 2020 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ 7,025 ​ 13,166 ​ 16,268 2021 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ 7,883 ​ 17,925 2022 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ 10,941 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Total ​ $ 275,506 ​ ​ ​ ​ ​ ​ ​ ​ ​ All outstanding liabilities before 2013, net of reinsurance ​ - ​ ​ ​ ​ ​ ​ Liabilities for claims and claim adjustment expenses, net of reinsurance ​ $ 95,348 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Commercial Automobile Physical Damage ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance ​ ​ ​ ​ ​ ​ ​ As of December 31, 2022 ​ ​ ​ ​ For the Years Ended December 31, ​ ​ ​ Total of Incurred-but-Not-Reported Liabilities Plus Expected Development of Reported Claims Cumulative Number of Reported Claims Accident Year ​ 2013 ​ 2014 ​ 2015 ​ 2016 ​ 2017 ​ 2018 ​ 2019 ​ 2020 ​ 2021 ​ 2022 ​ ​ ​ ​ ​ (Unaudited) ​ ​ ​ ​ ​ ​ ​ 2013 ​ $ 13,666 ​ $ 13,567 ​ $ 13,298 ​ $ 13,180 ​ $ 13,057 ​ $ 13,047 ​ $ 13,071 ​ $ 13,057 ​ $ 13,057 ​ $ 13,055 ​ $ - 12,298 2014 ​ ​ ​ 17,426 ​ 16,925 ​ 15,455 ​ 15,419 ​ 15,353 ​ 15,381 ​ 15,373 ​ 15,376 ​ 15,376 ​ - 13,545 2015 ​ ​ ​ ​ ​ 20,223 ​ 19,047 ​ 19,021 ​ 18,974 ​ 18,641 ​ 18,535 ​ 18,525 ​ 18,523 ​ - 15,468 2016 ​ ​ ​ ​ ​ ​ ​ 20,216 ​ 18,506 ​ 17,909 ​ 17,808 ​ 17,725 ​ 17,713 ​ 17,721 ​ 1 13,593 2017 ​ ​ ​ ​ ​ ​ ​ ​ ​ 19,691 ​ 19,200 ​ 19,021 ​ 18,834 ​ 18,780 ​ 18,774 ​ 2 13,113 2018 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ 21,230 ​ 19,937 ​ 19,270 ​ 19,210 ​ 19,196 ​ 2 12,907 2019 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ 20,039 ​ 19,652 ​ 18,956 ​ 18,685 ​ 0 12,757 2020 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ 16,507 ​ 16,334 ​ 16,606 ​ 198 9,620 2021 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ 20,156 ​ 21,524 ​ (124) 11,494 2022 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ 27,459 ​ (345) 12,118 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Total ​ $ 186,919 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Commercial Automobile Physical Damage ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ For the Years Ended December 31, ​ ​ ​ Accident Year ​ 2013 ​ 2014 ​ 2015 ​ 2016 ​ 2017 ​ 2018 ​ 2019 ​ 2020 ​ 2021 ​ 2022 ​ ​ ​ (Unaudited) ​ ​ ​ ​ ​ 2013 ​ $ 12,665 ​ $ 13,378 ​ $ 13,114 ​ $ 13,074 ​ $ 13,065 ​ $ 13,060 ​ $ 13,066 ​ $ 13,057 ​ $ 13,057 ​ $ 13,055 ​ 2014 ​ ​ ​ 15,377 ​ 15,862 ​ 15,424 ​ 15,388 ​ 15,381 ​ 15,376 ​ 15,373 ​ 15,376 ​ 15,376 ​ 2015 ​ ​ ​ ​ ​ 17,787 ​ 18,910 ​ 18,667 ​ 18,549 ​ 18,541 ​ 18,530 ​ 18,525 ​ 18,523 ​ 2016 ​ ​ ​ ​ ​ ​ ​ 17,228 ​ 18,143 ​ 17,763 ​ 17,712 ​ 17,709 ​ 17,712 ​ 17,721 ​ 2017 ​ ​ ​ ​ ​ ​ ​ ​ ​ 17,957 ​ 19,336 ​ 18,915 ​ 18,787 ​ 18,786 ​ 18,772 ​ 2018 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ 18,842 ​ 19,842 ​ 19,236 ​ 19,208 ​ 19,194 ​ 2019 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ 18,128 ​ 19,161 ​ 18,752 ​ 18,681 ​ 2020 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ 15,550 ​ 16,596 ​ 16,407 ​ 2021 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ 18,610 ​ 21,620 ​ 2022 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ 24,381 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Total ​ $ 183,730 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ All outstanding liabilities before 2013, net of reinsurance ​ - ​ ​ ​ ​ ​ ​ ​ Liabilities for claims and claim adjustment expenses, net of reinsurance ​ $ 3,189 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Homeowners Liability ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance ​ ​ ​ ​ ​ ​ ​ As of December 31, 2022 ​ ​ ​ ​ For the Years Ended December 31, ​ ​ ​ Total of Incurred-but-Not-Reported Liabilities Plus Expected Development of Reported Claims Cumulative Number of Reported Claims Accident Year ​ 2013 ​ 2014 ​ 2015 ​ 2016 ​ 2017 ​ 2018 ​ 2019 ​ 2020 ​ 2021 ​ 2022 ​ ​ ​ ​ ​ (Unaudited) ​ ​ ​ ​ ​ ​ ​ 2013 ​ $ 9,768 ​ $ 9,768 ​ $ 9,337 ​ $ 7,578 ​ $ 5,978 ​ $ 5,312 ​ $ 5,147 ​ $ 5,147 ​ $ 5,167 ​ $ 5,096 ​ $ - 265 2014 ​ ​ ​ 11,494 ​ 11,494 ​ 9,738 ​ 7,388 ​ 7,120 ​ 6,984 ​ 6,984 ​ 6,818 ​ 6,620 ​ - 261 2015 ​ ​ ​ ​ ​ 12,965 ​ 12,555 ​ 9,908 ​ 9,201 ​ 9,201 ​ 9,201 ​ 8,172 ​ 7,582 ​ 117 288 2016 ​ ​ ​ ​ ​ ​ ​ 10,594 ​ 10,594 ​ 10,594 ​ 9,847 ​ 9,491 ​ 9,491 ​ 8,873 ​ 151 277 2017 ​ ​ ​ ​ ​ ​ ​ ​ ​ 11,276 ​ 10,058 ​ 9,328 ​ 8,585 ​ 7,819 ​ 7,053 ​ 267 269 2018 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ 9,951 ​ 9,951 ​ 9,951 ​ 9,768 ​ 8,616 ​ 375 254 2019 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ 14,130 ​ 13,848 ​ 11,949 ​ 11,371 ​ 396 261 2020 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ 14,664 ​ 13,708 ​ 11,025 ​ 700 222 2021 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ 12,797 ​ 12,797 ​ (1,094) 210 2022 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ 12,973 ​ 4,724 173 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Total ​ $ 92,006 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Homeowners Liability ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ For the Years Ended December 31, ​ ​ ​ Accident Year ​ 2013 ​ 2014 ​ 2015 ​ 2016 ​ 2017 ​ 2018 ​ 2019 ​ 2020 ​ 2021 ​ 2022 ​ ​ ​ (Unaudited) ​ ​ ​ ​ ​ 2013 ​ $ 527 ​ $ 2,337 ​ $ 3,080 ​ $ 3,493 ​ $ 3,829 ​ $ 4,038 ​ $ 4,209 ​ $ 4,247 ​ $ 4,255 ​ $ 4,267 ​ 2014 ​ ​ ​ 340 ​ 1,834 ​ 3,212 ​ 4,200 ​ 4,828 ​ 6,315 ​ 6,368 ​ 6,419 ​ 6,419 ​ 2015 ​ ​ ​ ​ ​ 428 ​ 3,319 ​ 4,267 ​ 5,205 ​ 6,445 ​ 7,022 ​ 7,215 ​ 7,302 ​ 2016 ​ ​ ​ ​ ​ ​ ​ 647 ​ 2,669 ​ 4,257 ​ 5,387 ​ 6,300 ​ 7,128 ​ 7,628 ​ 2017 ​ ​ ​ ​ ​ ​ ​ ​ ​ 305 ​ 1,676 ​ 2,913 ​ 3,593 ​ 4,217 ​ 4,765 ​ 2018 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ 551 ​ 2,039 ​ 3,972 ​ 4,597 ​ 5,664 ​ 2019 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ 1,634 ​ 3,343 ​ 5,183 ​ 6,038 ​ 2020 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ 220 ​ 3,254 ​ 3,845 ​ 2021 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ 218 ​ 3,388 ​ 2022 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ 450 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Total ​ $ 49,766 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ All outstanding liabilities before 2013, net of reinsurance ​ - ​ ​ ​ ​ ​ ​ ​ Liabilities for claims and claim adjustment expenses, net of reinsurance ​ $ 42,240 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Homeowners Property Damage ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance ​ ​ ​ ​ ​ ​ ​ As of December 31, 2022 ​ ​ ​ ​ For the Years Ended December 31, ​ ​ ​ Total of Incurred-but-Not-Reported Liabilities Plus Expected Development of Reported Claims Cumulative Number of Reported Claims Accident Year ​ 2013 ​ 2014 ​ 2015 ​ 2016 ​ 2017 ​ 2018 ​ 2019 ​ 2020 ​ 2021 ​ 2022 ​ ​ ​ ​ ​ (Unaudited) ​ ​ ​ ​ ​ ​ ​ 2013 ​ $ 56,298 ​ $ 56,199 ​ $ 55,722 ​ $ 52,464 ​ $ 51,077 ​ $ 49,973 ​ $ 49,463 ​ $ 49,456 ​ $ 49,455 ​ $ 49,453 ​ $ 126 5,698 2014 ​ ​ ​ 59,160 ​ 60,213 ​ 59,751 ​ 57,331 ​ 55,127 ​ 54,607 ​ 54,602 ​ 54,560 ​ 54,556 ​ 251 6,077 2015 ​ ​ ​ ​ ​ 152,586 ​ 152,049 ​ 162,377 ​ 162,788 ​ 162,722 ​ 162,354 ​ 162,244 ​ 162,244 ​ 462 20,076 2016 ​ ​ ​ ​ ​ ​ ​ 67,116 ​ 66,442 ​ 64,208 ​ 61,262 ​ 60,019 ​ 59,898 ​ 59,857 ​ 312 5,421 2017 ​ ​ ​ ​ ​ ​ ​ ​ ​ 80,736 ​ 76,560 ​ 70,689 ​ 68,737 ​ 67,530 ​ 67,388 ​ 385 6,011 2018 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ 83,443 ​ 82,581 ​ 77,970 ​ 74,989 ​ 73,996 ​ 461 8,239 2019 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ 77,976 ​ 73,697 ​ 68,769 ​ 65,624 ​ 705 5,452 2020 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ 80,093 ​ 76,638 ​ 72,622 ​ 344 6,108 2021 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ 75,696 ​ 75,011 ​ (8,085) 6,335 2022 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ 72,523 ​ (4,404) 4,770 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Total ​ $ 753,274 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Homeowners Property Damage ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ For the Years Ended December 31, ​ ​ ​ Accident Year ​ 2013 ​ 2014 ​ 2015 ​ 2016 ​ 2017 ​ 2018 ​ 2019 ​ 2020 ​ 2021 ​ 2022 ​ ​ ​ (Unaudited) ​ ​ ​ ​ ​ 2013 ​ $ 38,661 ​ $ 48,456 ​ $ 49,702 ​ $ 49,612 ​ $ 49,653 ​ $ 49,620 ​ $ 49,328 ​ $ 49,327 ​ $ 49,327 ​ $ 49,328 ​ 2014 ​ ​ ​ 40,409 ​ 52,161 ​ 54,088 ​ 54,224 ​ 54,262 ​ 54,274 ​ 54,306 ​ 54,305 ​ 54,306 ​ 2015 ​ ​ ​ ​ ​ 112,563 ​ 145,337 ​ 160,572 ​ 161,745 ​ 161,773 ​ 161,850 ​ 161,783 ​ 161,781 ​ 2016 ​ ​ ​ ​ ​ ​ ​ 44,103 ​ 57,238 ​ 59,155 ​ 59,449 ​ 59,403 ​ 59,428 ​ 59,493 ​ 2017 ​ ​ ​ ​ ​ ​ ​ ​ ​ 46,366 ​ 64,401 ​ 66,181 ​ 66,892 ​ 66,765 ​ 66,826 ​ 2018 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ 57,704 ​ 70,959 ​ 72,078 ​ 73,119 ​ 73,307 ​ 2019 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ 49,121 ​ 61,905 ​ 63,536 ​ 64,427 ​ 2020 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ 50,304 ​ 65,927 ​ 68,706 ​ 2021 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ 51,390 ​ 67,998 ​ 2022 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ 48,906 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Total ​ $ 715,078 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ All outstanding liabilities before 2013, net of reinsurance ​ 1,030 ​ ​ ​ ​ ​ ​ ​ Liabilities for claims and claim adjustment expenses, net of reinsurance ​ $ 39,226 ​ ​ ​ ​ ​ The following is unaudited supplementary information about average historical claims duration as of December 31, 2022. ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance (Unaudited) ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Years ​ 1 ​ 2 ​ 3 ​ 4 ​ 5 ​ 6 ​ 7 ​ 8 ​ 9 ​ 10 Private Passenger Automobile Liability ​ 43.0% ​ 32.8% ​ 10.5% ​ 6.4% ​ 3.0% ​ 1.7% ​ 0.6% ​ 0.3% ​ 0.1% ​ 0.1% Private Passenger Automobile Physical Damage ​ 106.2% ​ (4.3)% ​ (2.4)% ​ (0.3)% ​ (0.1)% ​ 0.0% ​ 0.0% ​ 0.0% ​ 0.0% ​ 0.0% Commercial Automobile Liability ​ 26.2% ​ 25.2% ​ 12.2% ​ 11.8% ​ 7.1% ​ 5.8% ​ 3.0% ​ 0.7% ​ 1.2% ​ 0.0% Commercial Automobile Physical Damage ​ 94.4% ​ 6.7% ​ (2.1)% ​ (0.4)% ​ 0.0% ​ 0.0% ​ 0.0% ​ 0.0% ​ 0.0% ​ 0.0% Homeowners Liability ​ 5.8% ​ 24.0% ​ 15.5% ​ 10.2% ​ 11.0% ​ 10.4% ​ 3.2% ​ 0.9% ​ 0.1% ​ 0.3% Homeowners Property Damage ​ 71.6% ​ 21.1% ​ 4.6% ​ 0.8% ​ 0.0% ​ 0.0% ​ (0.1)% ​ 0.0% ​ 0.0% ​ 0.0% ​ ​ The reconciliation of the net incurred and paid claims development tables to the liability for claims and claim adjustment expenses in the consolidated balance sheets is as follows. ​ ​ ​ ​ Reconciliation of the Disclosure of Incurred and Paid Claims Development to the Liability for Unpaid claims and Claim Adjustment Expenses ​ ​ ​ ​ ​ December 31, 2022 Net outstanding liabilities ​ ​ Private Passenger Automobile Liability $ 176,810 Private Passenger Automobile Physical Damage ​ (2,887) Commercial Automobile Liability ​ 95,348 Commercial Automobile Physical Damage ​ 3,189 Homeowners Liability ​ 42,240 Homeowners Property Damage ​ 39,226 Other Short-Duration Insurance Lines ​ 72,813 Liabilities for unpaid claims and claim adjustment expenses, net of reinsurance $ 426,739 ​ ​ ​ Reinsurance recoverable on unpaid claims ​ ​ Private Passenger Automobile Liability $ 120 Private Passenger Automobile Physical Damage ​ - Commercial Automobile Liability ​ 86,788 Commercial Automobile Physical Damage ​ 2,836 Homeowners Liability ​ - Homeowners Property Damage ​ 3,270 Other Short-Duration Insurance Lines ​ 380 Total reinsurance recoverable on unpaid claims $ 93,394 ​ ​ ​ Unallocated claims adjustment expenses ​ 29,465 ​ ​ ​ Total gross liability for unpaid claims and claim adjustment expenses $ 549,598 ​ Due to the nature of the risks that the Company underwrites and has historically underwritten, management does not believe that it has an exposure to asbestos or environmental pollution liabilities.

Income Taxes

Income Taxes	12 Months Ended
	Dec. 31, 2022
Income Taxes
Income Taxes	13. Income Taxes A summary of the income tax expense in the consolidated statements of operations is shown below. ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Years Ended December 31, ​ ​ 2022 ​ 2021 ​ 2020 Current Income Taxes: ​ ​ ​ Federal ​ $ 21,317 ​ $ 28,222 ​ $ 31,133 State ​ 74 ​ 15 ​ 267 ​ ​ 21,391 ​ 28,237 ​ 31,400 Deferred Income Taxes: ​ ​ ​ ​ ​ ​ ​ ​ ​ Federal ​ (8,371) ​ 5,323 ​ 5,159 State ​ — ​ — ​ — ​ ​ (8,371) ​ 5,323 ​ 5,159 Total income tax expense ​ $ 13,020 ​ $ 33,560 ​ $ 36,559 ​ The income tax expense attributable to the consolidated results of operations is different from the amounts determined by multiplying income before federal income taxes by the statutory federal income tax rate. The sources of the difference and the tax effects of each were as follows for the periods indicated. ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Years Ended December 31, ​ ​ 2022 ​ 2021 ​ 2020 Federal income tax expense at statutory rate $ 12,512 $ 34,496 $ 36,702 Investment income, net ​ (559) ​ (1,060) ​ (1,394) State taxes, net ​ 58 ​ 11 ​ 211 Nondeductible expenses ​ 468 ​ 613 ​ 697 Tax related to share-based stock compensation ​ 222 ​ (101) ​ (298) Other, net ​ 319 ​ (399) ​ 641 Total income tax expense ​ $ 13,020 ​ $ 33,560 ​ $ 36,559 ​ The deferred income tax asset (liability) represents the tax effects of temporary differences attributable to the Company’s consolidated federal tax return group. Its components were as shown in the following table for the periods indicated. ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Years Ended December 31, ​ ​ 2022 ​ 2021 Deferred tax assets: ​ ​ ​ Discounting of loss reserves ​ $ 4,790 ​ $ 5,447 ​ Discounting of unearned premium reserve ​ 17,546 ​ 16,813 ​ Net unrealized losses on investments ​ ​ 16,917 ​ ​ — ​ Bad debt allowance ​ 329 ​ 430 ​ Employee benefits ​ 4,506 ​ 4,364 ​ Rent incentive ​ 684 ​ 797 ​ Total deferred tax assets before valuation allowance ​ 44,772 ​ 27,851 ​ Valuation allowance for deferred tax assets ​ — ​ — ​ Total deferred tax assets ​ 44,772 ​ 27,851 ​ Deferred tax liabilities: ​ ​ ​ ​ ​ ​ ​ Deferred acquisition costs ​ (15,872) ​ (15,335) ​ Investments ​ (2,662) ​ (10,319) ​ Net unrealized gains on investments ​ — ​ (11,025) ​ Loss reserve transition adjustment ​ (831) ​ (1,108) ​ Software development costs ​ (2,913) ​ (3,591) ​ Premium acquisition expenses ​ (461) ​ (380) ​ Depreciation ​ (959) ​ (1,333) ​ Total deferred tax liabilities ​ (23,698) ​ (43,091) ​ Net deferred tax assets (liability) ​ $ 21,074 ​ $ (15,240) ​ ​ uncertain tax positions under ASC 740, Income Taxes ​ During the years ended December 31, 2022 and December 31, 2021 there were no material changes to the amount of the Company’s unrecognized tax benefits or to any assumptions regarding the amount of its ASC 740 liability. As of December 31, 2022 and December 31, 2021, the Company had no unrecognized tax benefits, and none which if recognized would affect the effective tax rate. The Company does not currently anticipate significant changes in the amount of unrecognized income tax benefits during the next twelve months. The Company records interest and penalties associated with audits as a component of income before income taxes. Penalties are recorded in underwriting, operating and other expenses, and interest expense is recorded in interest expenses in the consolidated statements of operations. The Company had no interest and penalties related to income taxes accrued as of December 31, 2022 and 2021. In the Company’s opinion, adequate tax liabilities have been established for all open years. However, the amount of these tax liabilities could be revised in the near term if estimates of the Company’s ultimate liability are revised. All tax years prior to 2019 are closed.

Share Repurchase Program

Share Repurchase Program	12 Months Ended
	Dec. 31, 2022
Share Repurchase Program
Share Repurchase Program	14. Share Repurchase Program On August 3, 2007, the Board of Directors approved a share repurchase program of up to $30,000 of the Company’s outstanding common shares. The Board of Directors had cumulatively authorized increases to the existing share repurchase program of up to ​ During the year ended December 31, 2022, the Company purchased 170,904 shares on the open market under the program at a cost of $14,603 . During the year ended December 31, 2021, the Company purchased . During the year ended December 31, 2020, the Company purchased . As of December 31, 2022, the Company had purchased . As of December 31, 2021, the Company had purchased ​

Statutory Net Income and Surplu

Statutory Net Income and Surplus	12 Months Ended
	Dec. 31, 2022
Statutory Net Income and Surplus
Statutory Net Income and Surplus	​ 15. Statutory Net Income and Surplus Statutory Accounting Practices The Company’s insurance company subsidiaries, domiciled in the Commonwealth of Massachusetts, prepare statutory financial statements in accordance with the accounting practices prescribed or permitted by the Division. Prescribed statutory accounting practices are those practices that are incorporated directly or by reference in state laws, regulations, and general administrative rules applicable to all insurance enterprises domiciled in a particular state. Permitted statutory accounting practices include practices not prescribed by the Division, but allowed by the Division. Statutory net income was $66,197, $97,169, and $121,446 for the years ended December 31, 2022, 2021, and 2020, respectively. Statutory capital and surplus of the Company’s insurance subsidiaries was $782,200 and $826,979 at December 31, 2022 and 2021, respectively. Dividends The Insurance Subsidiaries are subject to various regulatory restrictions that limit the maximum amount of dividends available to be paid to their parent without prior approval of the Commonwealth of Massachusetts Commissioner of Insurance (the “Commissioner”). Massachusetts statute limits the dividends an insurer may pay in any twelve month period, without the prior permission of the Commissioner, to the greater of (i) 10% of the insurer’s surplus as of the preceding December 31 or (ii) the insurer’s net income for the twelve- month period ending the preceding December 31, in each case determined in accordance with statutory accounting practices. Our insurance company subsidiaries may not declare an “extraordinary dividend” (defined as any dividend or distribution that, together with other distributions made within the preceding twelve months, exceeds the limits established by Massachusetts statute) until thirty days after the Commissioner has received notice of the intended dividend and has not objected. As historically administered by the Commissioner, this provision requires the Commissioner’s prior approval of an extraordinary dividend. Under Massachusetts law, an insurer may pay cash dividends only from its unassigned funds, also known as earned surplus, and the insurer’s remaining surplus must be both reasonable in relation to its outstanding liabilities and adequate to its financial needs. At December 31, 2022, the statutory capital and surplus of Safety Insurance was $782,200 and its net income for 2022 was $66,197. As a result, a maximum of $78,220 is available in 2023 for such dividends without prior approval of the Commissioner. During the year ended December 31, 2022, Safety Insurance recorded dividends of $94,260. As result of this Massachusetts statute, the Insurance Subsidiaries had restricted net assets in the amount of $703,980 at December 31, 2022. Risk-Based Capital Requirements The NAIC has adopted a formula and model law to implement risk-based capital requirements for most property and casualty insurance companies, which are designed to determine minimum capital requirements and to raise the level of protection that statutory surplus provides for policyholder obligations. Under Massachusetts law, insurers having less total adjusted capital than that required by the risk-based capital calculation will be subject to varying degrees of regulatory action, depending on the level of capital inadequacy. The risk-based capital law provides for four levels of regulatory action. The extent of regulatory intervention and action increases as the level of total adjusted capital to risk-based capital falls. As of December 31, 2022, the Insurance Subsidiaries had total adjusted capital of $782,200, which is in excess of amounts requiring company or regulatory action at any prescribed risk-based capital action level. Minimum statutory capital and surplus, or company action level risk-based capital, was $200,806 at December 31, 2022. ​

Fair Value of Financial Instrum

Fair Value of Financial Instruments	12 Months Ended
	Dec. 31, 2022
Fair Value of Financial Instruments
Fair Value of Financial Instruments	16. Fair Value of Financial Instruments ASC 820, Fair Value Measurements and Disclosure ​ Level 1 — Valuations based on quoted prices in active markets for identical assets and liabilities; ​ Level 2 — Valuations based on observable inputs that do not meet the criteria for Level 1, including quoted prices in inactive markets and quoted prices in active markets for similar, but not identical instruments; and ​ Level 3 — Valuations based on unobservable inputs. ​ Fair values for the Company’s fixed maturity securities are based on prices provided by its custodian bank and its investment managers. Both the Company’s custodian bank and investment managers use a variety of independent, nationally recognized pricing services to determine market valuations. If the pricing service cannot provide fair value determinations, the Company obtains non-binding price quotes from broker-dealers. A minimum of two quoted prices is obtained for the majority of the Company’s available-for-sale fixed maturity securities in its investment portfolio. The Company uses a third-party pricing service as its primary provider of quoted prices from third-party pricing services and broker-dealers. To provide reasonable assurance of the validity of each price or quote, a secondary third-party pricing service or broker-dealer quote is obtained from the Company’s custodian or investment managers. An examination of the pricing data is then performed for each security. If the variance between the primary and secondary price quotes for a security is within an accepted tolerance level, the quoted price obtained from the Company’s primary source is used for the security. If the variance between the primary and secondary price quotes exceeds an accepted tolerance level, the Company obtains a quote from an alternative source, if possible, and documents and resolves any differences between the pricing sources. In addition, the Company may request that its investment managers and its traders provide input as to which vendor is providing prices that its traders believe are reflective of fair value for the security. Following this process, the Company may decide to value the security in its financial statements using the secondary or alternative source if it believes that pricing is more reflective of the security’s value than the primary pricing provided by its custodian bank. The Company analyzes market valuations received to verify reasonableness, to understand the key assumptions used and their sources, and to determine an appropriate ASC 820 fair value hierarchy level based upon trading activity and the observability of market inputs. Based on this evaluation and investment class analysis, each price is classified into Level 1, 2 or 3. ​ Fair values of instruments are based on (i) quoted prices in active markets for identical assets (Level 1), (ii) quoted prices for similar instruments in active markets, quoted prices for identical or similar instruments in markets that are not active and model-derived valuations in which all significant inputs are observable in active markets (Level 2) or (iii) valuations derived from valuation techniques in which one or more significant inputs are unobservable in the marketplace (Level 3). ​ The Company’s Level 1 securities consist of equity securities whose values are based on quoted prices in active markets for identical assets. The Company’s Level 2 securities are comprised of available-for-sale fixed maturity securities whose fair value was determined using observable market inputs. The Company’s Level 3 security consists of an investment in the Federal Home Loan Bank of Boston related to Safety Insurance Company’s membership stock, which is not redeemable in a short-term time frame. Fair values for securities for which quoted market prices were unavailable were estimated based upon reference to observable inputs such as benchmark interest rates, market comparables, and other relevant inputs. Investments valued using these inputs include U.S. Treasury securities, obligations of states and political subdivisions, corporate and other securities, commercial and residential mortgage-backed securities, and other asset-backed securities. Inputs into the fair value application that are utilized by asset class include but are not limited to: ● Obligations of states and political subdivisions : overall credit quality, including assessments of market sectors and the level and variability of sources of payment such as general obligation, revenue or lease; credit support such as insurance, state or local economic and political base, prefunded and escrowed to maturity covenants. ● Corporate and other securities : overall credit quality, the establishment of a risk adjusted credit spread over the applicable risk-free yield curve for discounted cash flow valuations; assessments of the level of industry economic sensitivity, company financial policies, indenture restrictive covenants, and/or security and collateral. ● Residential mortgage-backed securities : U.S. agency pass-throughs, collateralized mortgage obligations (“CMOs”), non U.S. agency CMOs: estimates of prepayment speeds based upon historical prepayment rate trends, underlying collateral interest rates, original weighted average maturity, vintage year, borrower credit quality characteristics, interest rate and yield curve forecasts, U.S. government support programs, tax policies, and delinquency/default trends. ● Commercial mortgage-backed securities : overall credit quality, including assessments of the level and variability of credit support and collateral type such as office, retail, or lodging, predictability of cash flows for the deal structure, prevailing economic market conditions. ● Other asset-backed securities : overall credit quality, estimates of prepayment speeds based upon historical trends and characteristics of underlying loans, including assessments of the level and variability of collateral, revenue generating agreements, area licenses agreements, product sourcing agreements and equipment and property leases. ● FHLB-Boston : value is equal to the cost of the member stock purchased. ​ In order to ensure the fair value determination is representative of an exit price (consistent with ASC 820), the Company’s procedures for validating quotes or prices obtained from third parties include, but are not limited to, obtaining a minimum of two price quotes for each fixed maturity security if possible, as discussed above, the periodic testing of sales activity to determine if there are any significant differences between the market price used to value the security as of the balance sheet date and the sales price of the security for sales that occurred around the balance sheet date, and the periodic review of reports provided by its external investment manager regarding those securities with ratings changes and securities placed on its “Watch List.” In addition, valuation techniques utilized by pricing services and prices obtained from external sources are reviewed by the Company’s external investment manager, whose investment professionals are familiar with the securities being priced and the markets in which they trade, to ensure the fair value determination is representative of an exit price. ​ All unadjusted estimates of fair value for our fixed maturities priced by the pricing services as described above are included in the amounts disclosed in Level 2. With the exception of the FHLB-Boston security, which is categorized as a Level 3 security, the Company’s entire portfolio was priced based upon quoted market prices or other observable inputs as of December 31, 2022. There were no significant changes to the valuation process during the year ended December 31, 2022. As of December 31, 2022 and December 31, 2021, no quotes or prices obtained were adjusted by management. All broker quotes obtained were non-binding. ​ At December 31, 2022 and December 31, 2021, investments in fixed maturities classified as available-for-sale had a fair value which equaled carrying value of $1,050,155 and $1,218,279, respectively. At December 31, 2022 and December 31, 2021 the Company held no short-term investments. The carrying values of cash and cash equivalents and investment income accrued approximated fair value. ​ The following tables summarize the Company’s total fair value measurements for investments for the periods indicated. ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ As of December 31, 2022 ​ Total Level 1 Inputs Level 2 Inputs Level 3 Inputs U.S. Treasury securities ​ $ 1,669 ​ $ — ​ $ 1,669 ​ $ — Obligations of states and political subdivisions ​ 54,069 ​ — ​ 54,069 ​ — Residential mortgage-backed securities ​ 234,502 ​ — ​ 234,502 ​ — Commercial mortgage-backed securities ​ 139,931 ​ — ​ 139,931 ​ — Other asset-backed securities ​ 68,731 ​ — ​ 68,731 ​ — Corporate and other securities ​ 551,253 ​ — ​ 551,253 ​ — Equity securities ​ 199,705 ​ 197,450 ​ — ​ 2,255 Total investment securities ​ $ 1,249,860 ​ $ 197,450 ​ $ 1,050,155 ​ $ 2,255 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ As of December 31, 2021 ​ Total Level 1 Inputs Level 2 Inputs Level 3 Inputs U.S. Treasury securities ​ $ 324 ​ $ — ​ $ 324 ​ $ — Obligations of states and political subdivisions ​ 116,302 ​ — ​ 116,302 ​ — Residential mortgage-backed securities ​ 241,464 ​ — ​ 241,464 ​ — Commercial mortgage-backed securities ​ 150,883 ​ — ​ 150,883 ​ — Other asset-backed securities ​ 83,596 ​ — ​ 83,596 ​ — Corporate and other securities ​ 625,710 ​ — ​ 625,710 ​ — Equity securities ​ 226,375 ​ 224,677 ​ — ​ 1,698 Total investment securities ​ $ 1,444,654 ​ $ 224,677 ​ $ 1,218,279 ​ $ 1,698 ​ There were no transfers between Level 1 and Level 2 during the years ended December 31, 2022 or 2021. The following tables summarize the changes in the Company’s Level 3 fair value securities for the periods indicated. ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Years Ended December 31, ​ 2022 2021 2020 Balance at beginning of period ​ $ 1,698 ​ $ 1,698 ​ $ 516 Net gains and losses included in earnings ​ — ​ — ​ — Net gains included in other comprehensive income ​ — ​ — ​ — Purchases ​ 557 ​ — ​ 1,182 Sales ​ ​ — ​ ​ — ​ ​ — Transfers into Level 3 ​ — ​ — ​ — Transfers out of Level 3 ​ — ​ — ​ — Balance at end of period ​ $ 2,255 ​ $ 1,698 ​ $ 1,698 ​ Transfers in and out of Level 3 are attributable to changes in the ability to observe significant inputs in determining fair value exit pricing. As noted in the table above, during 2022, 2021 and 2020. The Company held one Level 3 security at December 31, 2022. ​ As of December 31, 2022 and December 31, 2021, there were approximately $40,450 and $38,570 in a REIT and is included in equity securities in the consolidated balance sheets. The REIT is excluded from the fair value hierarchy because the fair value is recorded using the net asset value per share practical expedient. The net asset value per share of this REIT is derived from member ownership in the capital venture to which a proportionate share of independently appraised net assets is attributed. The fair value was determined using the trust’s net asset value obtained from its audited financial statements. The Company is required to submit a request

Subsequent Events

Subsequent Events	12 Months Ended
	Dec. 31, 2022
Subsequent Events
Subsequent Events	​ 17. Subsequent Events The Company has evaluated subsequent events for recognition or disclosure in the consolidated financial statements on Form 10-K filed herewith and no events have occurred that require recognition or disclosure. ​

Schedule I - Summary of Investm

Schedule I - Summary of Investments - Other than Investments in Related Parties	12 Months Ended
	Dec. 31, 2022
Schedule I - Summary of Investments - Other than Investments in Related Parties
Schedule I - Summary of Investments - Other than Investments in Related Parties	Safety Insurance Group, Inc. Summary of Investment s —Other than Investments in Related Parties Schedule I At December 31, 2022 (Dollars in thousands) ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Amount at ​ ​ ​ ​ ​ ​ ​ ​ which shown ​ ​ Cost or ​ Estimated ​ in the Balance ​ ​ Amortized Cost ​ Fair Value ​ Sheet Fixed maturities: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ U.S. government and government agencies and authorities ​ $ 261,703 ​ $ 236,171 ​ $ 236,171 ​ Obligations of states and political subdivisions ​ 57,319 ​ 54,069 ​ 54,069 ​ Corporate and other securities ​ 833,757 ​ 759,915 ​ 759,915 ​ Total fixed maturities ​ 1,152,779 ​ 1,050,155 ​ 1,050,155 ​ Equity securities: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Common stocks: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Industrial, miscellaneous and all other ​ 231,444 ​ 240,155 ​ 240,155 ​ Total equity securities ​ 231,444 ​ 240,155 ​ 240,155 ​ Other invested assets (1) ​ 112,850 ​ 112,850 ​ 112,850 ​ Total investments ​ $ 1,497,073 ​ $ 1,403,160 ​ $ 1,403,160 ​ ​

Schedule II - Condensed Financi

Schedule II - Condensed Financial Information of the Registrant	12 Months Ended
	Dec. 31, 2022
Schedule II - Condensed Financial Information of the Registrant
Schedule II - Condensed Financial Information of the Registrant	Safety Insurance Group, Inc. Condensed Financial Information of the Registran t Condensed Balance Sheets Schedule II (Dollars in thousands) ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Years Ended December 31, ​ ​ 2022 ​ 2021 Assets ​ ​ Investments in consolidated affiliates ​ $ 813,916 ​ $ 929,136 Other ​ 9 ​ 24 Total assets ​ $ 813,925 ​ $ 929,160 Liabilities ​ ​ ​ ​ ​ ​ Accounts payable and other liabilities ​ $ 1,926 ​ $ 1,987 Total liabilities ​ 1,926 ​ 1,987 Shareholders’ equity ​ 811,999 ​ 927,173 Total liabilities and shareholders’ equity ​ $ 813,925 ​ $ 929,160 ​ The condensed financial statements should be read in conjunction with the consolidated financial statements and notes thereto. Safety Insurance Group, Inc. Condensed Financial Information of the Registrant Condensed Statements of Operations and Comprehensive (Loss) Income Schedule II (Dollars in thousands) ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Years Ended December 31, ​ ​ 2022 ​ 2021 ​ 2020 Revenues $ — $ — $ — Expenses ​ 3,255 ​ 1,755 ​ 1,833 Net loss ​ (3,255) ​ (1,755) ​ (1,833) Earnings from consolidated subsidiaries ​ 49,816 ​ 132,465 ​ 140,044 Net income ​ 46,561 ​ 130,710 ​ 138,211 Other comprehensive (loss) income, net of tax ​ (105,117) ​ (28,948) ​ 25,337 Comprehensive (loss) income ​ $ (58,556) ​ $ 101,762 ​ $ 163,548 ​ The condensed financial statements should be read in conjunction with the consolidated financial statements and notes thereto. ​ ​ Safety Insurance Group, Inc. Condensed Financial Information of the Registrant Condensed Statements of Cash Flows Schedule II (Dollars in thousands) ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Years Ended December 31, ​ ​ 2022 ​ 2021 ​ 2020 Net income $ 46,561 $ 130,710 $ 138,211 Adjustments to reconcile net income to net cash provided by operating activities: ​ ​ ​ ​ ​ ​ ​ ​ ​ Earnings from consolidated subsidiaries ​ (49,816) ​ (132,465) ​ (140,044) Dividends received from consolidated subsidiaries(1) ​ 94,260 ​ 49,488 ​ 89,156 Amortization of restricted stock expense ​ 6,022 ​ 6,304 ​ 7,248 Changes in assets and liabilities: ​ ​ ​ ​ ​ ​ ​ ​ ​ Intercompany receivable / payable ​ ​ (11,376) ​ ​ 11,821 ​ ​ (93) Other assets ​ 15 ​ 15 ​ 15 Accounts payable and accrued liabilities ​ (75) ​ (302) ​ 81 Net cash provided by operating activities ​ 85,591 ​ 65,571 ​ 94,574 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Contributed capital ​ ​ (17,950) ​ ​ — ​ ​ — Net cash provided by investing activities ​ ​ (17,950) ​ — ​ — ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Dividends paid ​ (53,038) ​ (54,008) ​ (54,575) Acquisition of treasury stock ​ (14,603) ​ (11,563) ​ (39,999) Net cash used for financing activities ​ (67,641) ​ (65,571) ​ (94,574) ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Net increase in cash and cash equivalents ​ — ​ — ​ — Cash and cash equivalents, beginning of year ​ — ​ — ​ — Cash and cash equivalents, end of year ​ $ — ​ $ — ​ $ — ​ (1) No portion of the dividends received from operating subsidiaries during 2022, 2021 or 2020 represent returns of capital and therefore no portion is presented as an investing activity. ​ The condensed financial statements should be read in conjunction with the consolidated financial statements and notes thereto.

Schedule III - Supplementary In

Schedule III - Supplementary Insurance Information	12 Months Ended
	Dec. 31, 2022
Schedule III - Supplementary Insurance Information
Schedule III - Supplementary Insurance Information	Safety Insurance Group, Inc. Supplementary Insurance Informatio n Schedule III (Dollars in thousands) ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ As of December 31, ​ Years Ended December 31, ​ ​ ​ ​ ​ Future Policy ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Deferred ​ Benefits, ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Policy ​ Losses, ​ ​ ​ ​ ​ ​ ​ Net ​ ​ Acquisition ​ Claims and Loss ​ Unearned ​ Earned ​ ​ Investment Segment ​ Costs ​ Expenses ​ Premiums ​ Premiums ​ ​ Income Property and Casualty Insurance ​ ​ ​ ​ ​ ​ ​ ​ 2022 ​ $ 75,582 ​ $ 549,598 ​ $ 433,375 ​ $ 758,505 ​ $ 46,725 2021 ​ 73,024 ​ ​ 570,651 ​ ​ 413,487 ​ ​ 774,328 ​ ​ 44,135 2020 ​ 74,962 ​ ​ 567,581 ​ ​ 421,901 ​ ​ 771,078 ​ ​ 41,045 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Years Ended December 31, ​ ​ ​ ​ ​ ​ ​ ​ Benefits, ​ Amortization of ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Claims, ​ Deferred ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Net ​ Losses, and ​ Policy ​ ​ Other ​ ​ ​ ​ ​ Premium ​ Investment ​ Settlement ​ Acquisition ​ ​ Operating ​ Premiums Segment ​ Revenue ​ Income ​ Expenses ​ Costs ​ ​ Expenses ​ Written Property and Casualty Insurance ​ ​ ​ ​ 2022 $ 758,505 $ 46,725 ​ $ 491,979 ​ $ 146,013 $ 99,132 ​ $ 773,735 2021 ​ ​ 774,328 ​ 44,135 ​ ​ 461,727 ​ ​ 146,573 ​ 111,819 ​ ​ 764,526 2020 ​ ​ 771,078 ​ 41,045 ​ ​ 404,556 ​ ​ 146,955 ​ 119,527 ​ ​ 763,537 ​

Schedule IV - Reinsurance

Schedule IV - Reinsurance	12 Months Ended
	Dec. 31, 2022
Schedule IV - Reinsurance
Schedule IV - Reinsurance	Safety Insurance Group, Inc. Reinsuranc e Schedule IV (Dollars in thousands) ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Percent of ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Amount Property and Casualty ​ Gross ​ Ceded to Other ​ Assumed from ​ Net ​ Assumed Insurance Earned Premiums ​ Amount ​ Companies ​ Other Companies ​ Amount ​ to Net Years ended December 31, ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ 2022 ​ $ 803,289 ​ $ 73,760 ​ $ 28,976 ​ $ 758,505 3.8% 2021 ​ 811,329 ​ ​ 67,584 ​ ​ 30,583 ​ 774,328 3.9% 2020 ​ 815,981 ​ ​ 74,268 ​ ​ 29,365 ​ 771,078 3.8% ​

Schedule V - Valuation and Qual

Schedule V - Valuation and Qualifying Accounts	12 Months Ended
	Dec. 31, 2022
Schedule V - Valuation and Qualifying Accounts
Schedule V - Valuation and Qualifying Accounts	Safety Insurance Group, Inc. Valuation and Qualifying Account s Schedule V (Dollars in thousands) ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Additions ​ ​ ​ ​ ​ ​ ​ ​ Balance at ​ Charged to ​ Charged to ​ ​ ​ ​ Balance at ​ ​ Beginning ​ Costs and ​ Other ​ ​ ​ ​ End of ​ ​ of Period ​ Expenses ​ Accounts ​ Deductions(1) ​ Period Allowance for doubtful accounts Years Ended December 31, ​ ​ ​ ​ ​ 2022 ​ $ 1,808 ​ $ 1,339 ​ $ — ​ $ 1,701 ​ $ 1,446 2021 ​ 1,754 ​ ​ 2,339 ​ ​ — ​ ​ 2,285 ​ 1,808 2020 ​ 578 ​ 3,294 ​ — ​ 2,118 ​ 1,754 ​ (1) Deductions represent write-offs of accounts determined to be uncollectible.

Schedule VI - Supplemental Info

Schedule VI - Supplemental Information Concerning Property and Casualty Insurance Operations	12 Months Ended
	Dec. 31, 2022
Schedule VI - Supplemental Information Concerning Property and Casualty Insurance Operations
Schedule VI - Supplemental Information Concerning Property and Casualty Insurance Operations	Safety Insurance Group, Inc. Supplemental Information Concerning Property and Casualty Insurance Operation s Schedule VI (Dollars in thousands) ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ As of December 31, ​ Years Ended December 31, ​ ​ ​ ​ ​ Reserves for ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Deferred ​ Unpaid Claims ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Policy ​ and Claims ​ ​ ​ ​ ​ ​ ​ Net ​ ​ Acquisition ​ Adjustment ​ Unearned ​ Earned ​ Investment Affiliation With Registrant ​ Costs ​ Expenses ​ Premiums ​ Premiums ​ Income Consolidated Property & Casualty Subsidiaries ​ ​ ​ ​ ​ 2022 ​ $ 75,582 ​ $ 549,598 ​ $ 433,375 ​ $ 758,505 ​ $ 46,725 2021 ​ 73,024 ​ ​ 570,651 ​ ​ 413,487 ​ ​ 774,328 ​ ​ 44,135 2020 ​ 74,962 ​ ​ 567,581 ​ ​ 421,901 ​ ​ 771,078 ​ ​ 41,045 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Years Ended December 31, ​ ​ Claims and Claims ​ ​ Amortization ​ ​ ​ ​ ​ ​ ​ ​ Adjustment Expenses ​ ​ of Deferred ​ ​ Paid Claims ​ ​ ​ ​ ​ Incurred Related to ​ ​ Policy ​ ​ and Claims ​ ​ ​ ​ ​ Current ​ Prior ​ ​ Acquisition ​ ​ Adjustment ​ Premiums Affiliation With Registrant ​ Year ​ Year ​ ​ Costs ​ ​ Expenses ​ Written Consolidated Property & Casualty Subsidiaries ​ ​ ​ ​ ​ 2022 ​ $ 549,258 ​ $ (57,279) ​ $ 146,013 ​ $ 515,759 ​ $ 773,735 2021 ​ 515,400 ​ ​ (53,673) ​ ​ 146,573 ​ ​ 443,013 ​ ​ 764,526 2020 ​ 459,400 ​ ​ (54,844) ​ ​ 146,955 ​ ​ 431,480 ​ ​ 763,537 ​

Summary of Significant Accoun_2

Summary of Significant Accounting Policies (Policies)	12 Months Ended
	Dec. 31, 2022
Summary of Significant Accounting Policies
Investments	Investments Investments in fixed maturities, which include taxable and non- taxable bonds and redeemable preferred stocks, are reported at fair value. Fair values for fixed maturity securities are based on estimates obtained from independent pricing services. Unrealized gains or losses on fixed maturity securities reported at fair value are excluded from earnings and reported in a separate component of shareholder’s equity known as “accumulated other comprehensive income net of taxes” until realized. For fixed maturities 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 an anticipated recovery in value, the Company separates the credit loss component of the impairment from the amount related to all other factors and reports the credit loss component as credit loss expense. The impairment related to all other factors (non-credit factors) is reported in accumulated other comprehensive income. The allowance for expected credit losses is adjusted for any additional credit losses and subsequent recoveries. Upon recognizing a credit loss, the cost basis is not adjusted. See Note 3 for further details of the Company’s accounting for impairments of available-for-sale investments. Investments in equity securities, which include interests in common stocks, mutual funds and a real estate investment trust (“REIT”), are reported at fair value. Fair values for equity securities are derived from external market quotations, with the exception of the REIT whose fair value was determined using the trust’s net asset value obtained from its audited financial statements. Changes in unrealized gains or losses on equity securities are recognized in earnings. Other invested assets consist of investments in limited partnerships. The partnership interest is accounted for using the equity method of accounting and recorded in earnings from partnership investments. The carrying value of these investments are written down, or impaired, to fair value when a decline in value is considered to be other-than-temporary. In applying the equity method (including assessment for other-than-temporary impairment), the Company uses financial information provided by the investee, generally on a three month lag. Realized gains or losses on the sale or maturity of investments are determined based on the specific cost identification method. Investment income is recognized on an accrual basis of accounting. Bonds not backed by other loans are amortized using the interest method. Loan-backed bonds and structured securities are amortized using the interest method and significant changes in estimated cash flows from the original purchase assumptions are accounted for using the retrospective method.
Cash and Cash Equivalents	Cash and Cash Equivalents Cash and cash equivalents includes money market accounts and U.S. Treasury bills with original maturities of three months or less from the date of purchase. U.S. Treasury bills are stated at amortized cost, which approximates fair value.
Accounts Receivable	Accounts Receivable Amounts included in accounts receivable represent premiums as well as finance charges, the majority of which are billed on a monthly installment basis. Accounts receivable are stated net of allowances for doubtful accounts. At December 31, 2022 and 2021, these allowances were $1,446 and $1,808, respectively. Uncollected premium balances over ninety days past due are written off.
Deferred Policy Acquisition Costs	Deferred Policy Acquisition Costs Amounts that vary with and are primarily related to the successful acquisition of a new or renewal insurance contract, principally commissions and premium taxes, are deferred and amortized ratably over the effective period of the policy. All other acquisition expenses are expensed as incurred. Deferred policy acquisition costs are reviewed to determine if they are recoverable from future income, and if not, are charged to expense. Future investment income attributable to related premiums is not taken into account in measuring the recoverability of the carrying value of this asset. Amortization of acquisition costs in the amount of $146,013, $146,573 and $146,955 were included in underwriting, operating and other expenses for the years ended 2022, 2021 and 2020, respectively.
Equity and Deposits in Pools	Equity and Deposits in Pools Equity and deposits in pools represents the net receivable amounts from the residual market mechanisms, Commonwealth Automobile Reinsurers (“CAR”) for automobile and Massachusetts Property Insurance Underwriting Association (“FAIR Plan”) for homeowners insurance in Massachusetts. See Note 11 for a discussion of the Company’s accounting for amounts assumed from residual markets.
Equipment and Leasehold Improvements	Equipment and Leasehold Improvements Property, equipment, leasehold improvements, and software which are included in other assets are carried at cost less accumulated depreciation. Depreciation is provided using the straight- line or accelerated method over the estimated useful lives of the related assets, which range from 3 to 10 years. Amortization of leasehold improvements is provided using the straight-line method over the term of the lease. The costs of computer software developed or obtained for internal use are capitalized and amortized over the estimated life of the business system, beginning when the software is ready for its intended use. Maintenance and repairs are charged to expense as incurred
Business Combinations	Business Combinations Business Combinations . Purchase consideration is allocated to the assets acquired, including customer relationship intangible assets, and liabilities assumed based on their estimated fair values at acquisition. Management estimated the fair value of such intangible assets using an income approach that considered cash flows expected to be generated by the acquired business relationships, a weighted average cost of capital discount rate reflecting the relative risk of achieving the anticipated cash flows, profits, the time value of money, and other relevant inputs. The excess of the total purchase consideration over the fair value of the identified net assets acquired is recognized as goodwill. The results of acquired businesses are included in the results of operations beginning from the date of acquisition. Acquisition related costs are expensed as incurred. During the measurement period, which may be up to one year from the acquisition date, the Company may record adjustments to the allocation of purchase consideration and to the fair values of assets acquired and liabilities assumed to the extent that additional information becomes available. After this period, any subsequent adjustments are recorded in earnings.
Goodwill	Goodwill Goodwill generated through acquisition is carried at cost, net of impairments. Goodwill is not amortized but is reviewed for impairment at least annually or more frequently when indicators of potential impairment exist. Management first evaluates impairment of goodwill by assessing qualitative factors to determine whether it is more likely than not that the fair value of a reporting unit is less than its carrying amount. If after performing the qualitative assessment, management determines it is more likely than not that the fair value of the reporting unit is less than its carrying amount, a quantitative assessment to determine the fair value of the reporting unit. Management’s determination of the fair value of the reporting unit incorporates multiple inputs into discounted cash flow calculations, including levels of economic capital required to support the business, future business growth, earnings projections, and the weighted average cost of capital used for purposes of discounting. Goodwill is impaired up to the amount that the carrying value of the reporting unit exceeds the fair value. The Company did not recognize any goodwill impairments during the year ended December 31, 2022.
Intangible Assets	Intangible Assets . The Company recognized of amortization expense annually. Intangible assets are assessed for impairment generally when events or circumstances indicate a potential impairment. If it is determined that the carrying amount of the asset is not recoverable, the asset is written down to fair value and an impairment loss is recognized. The Company did not identify any impairment indicators during the year ended December 31, 2022.
Revenue Recognition	Revenue Recognition Financial Services – Insurance Revenue from Contracts with Customers ​ Premiums are earned over the terms of the respective policies, which are generally one year . Unearned premiums represent the portion of premiums written applicable to the unexpired terms of the policies. ​ Ceded premiums are charged to income over the terms of the respective policies and the applicable term of the reinsurance contracts with third-party reinsurers. Ceded unearned premiums represent the unexpired portion of premiums ceded to CAR and other reinsurers. Premiums received in advance of the policy effective date are recorded as a liability and not recognized as income until earned. Such amounts are included in accounts payable and accrued liabilities and totaled $12,858 and $10,630 at December 31, 2022 and 2021, respectively. Finance and other service income primarily include revenues from premium installment charges, which are recognized when earned. Commission revenue includes new and renewal commissions paid by insurance carriers. These commissions are earned at the later of the effective date or billing date, as all rights are passed to the insured, the obligation to pay a claim resides with the insurance carrier, and no further performance obligation exists for the Company. Under the terms of its contracts with insurance carriers, the Company can earn additional, variable commission revenue in the form of annual contingent underwriting commissions (“CUC”) based on the underwriting performance of the insurance book of business. Each carrier contract and related CUC is calculated independently. Under ASC 606, the Company must estimate the amount of consideration that will be received in the coming year such that a significant reversal of revenue is not probable. As such, CUC is recognized as a contract asset as policies are issued using applicable premium and payout factors based on the estimated loss ratio from the contract.
Losses and Loss Adjustment Expenses	Losses and Loss Adjustment Expenses Liabilities for losses and loss adjustment expenses (“LAE”) include case basis estimates for open claims reported prior to year- end and estimates of unreported claims and claim adjustment expenses, net of salvage and subrogation. The estimates are continually reviewed and modified to reflect current conditions, and any resulting adjustments are reflected in current operating results. Adjustments for anticipated salvage and subrogation are recorded on incurred and reported and incurred but not reported losses. ​ The Company determines its loss and LAE reserves estimate based upon the analysis of our actuaries. A reasonable estimate is derived by selecting a point estimate within a range of indications as calculated by our actuaries using generally accepted actuarial techniques. The key assumption in most actuarial analysis is that past patterns of frequency and severity will repeat in the future, unless a significant change in the factors described above takes place. Our key factors and resulting assumptions are the ultimate frequency and severity of claims, based upon the most recent ten years of claims reported to the Company, and the data reported to us to calculate our share of the residual market. For each accident year and each coverage within a line of business our actuaries calculate the ultimate losses incurred.
Reinsurance	Reinsurance Liabilities for unearned premiums and unpaid losses are stated before deductions for ceded reinsurance. The ceded amounts are carried as receivables. Earned premiums are stated net of deductions for ceded reinsurance. The Company, as primary insurer, will be required to pay losses in their entirety in the event that the reinsurers are unable to discharge their obligations under the reinsurance agreements.
Advertising Costs	Advertising Costs Advertising costs are charged to expense when they are incurred. Total advertising costs were $2,399, $2,232 and $2,311 for the years ended December 31, 2022, 2021, and 2020, respectively, and are included in underwriting, operating and related expenses.
Income Taxes	Income Taxes The Company and its subsidiaries file a consolidated U.S. federal income tax return. The method of allocation among members of the consolidated group is subject to a written agreement approved by the Board of Directors (the “Board”). The consolidated tax liability is allocated on the basis of the members’ proportionate contribution to consolidated taxable income. Deferred income taxes are generally recognized when assets and liabilities have different values for financial statement and tax reporting purposes, and for other temporary taxable and deductible differences as defined by ASC 740, Income Taxes. ​
Earnings per Weighted Average Common Share	Earnings per Weighted Average Common share ​ Basic earnings per weighted average common share (“EPS”) are calculated by dividing net income by the weighted average number of basic common shares outstanding during the period. Diluted earnings per share amounts are based on the weighted average number of common shares including non-vested performance stock grants. ​ The following table sets forth the computation of basic and diluted EPS for the periods indicated. ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Years Ended December 31, ​ ​ ​ 2022 ​ ​ 2021 ​ ​ 2020 Earnings attributable to common shareholders - basic and diluted: ​ ​ ​ ​ ​ ​ ​ ​ ​ Net income from continuing operations ​ $ 46,561 ​ $ 130,710 ​ $ 138,211 Allocation for participating shares ​ ​ (205) ​ ​ 575 ​ ​ 636 Net income from continuing operations attributed to common shareholders ​ $ 46,356 ​ $ 131,285 ​ $ 138,847 Earnings per share denominator - basis and diluted ​ ​ ​ ​ ​ ​ ​ ​ ​ Total weighted average common shares outstanding, including participating shares ​ ​ 14,672,234 ​ ​ 14,894,532 ​ ​ 15,071,955 Less: weighted average participating shares ​ ​ (64,751) ​ ​ (65,796) ​ ​ (69,200) Basic earnings per share denominator ​ ​ 14,607,483 ​ ​ 14,828,736 ​ ​ 15,002,755 Common equivalent shares- non-vested performance stock grants ​ 103,128 ​ 96,990 ​ 116,272 Diluted earnings per share denominator ​ 14,710,611 ​ 14,925,726 ​ 15,119,027 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Basic earnings per share ​ $ 3.17 ​ $ 8.85 ​ $ 9.25 Diluted earnings per share ​ $ 3.15 ​ $ 8.80 ​ $ 9.18 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Undistributed earnings attributable to common shareholders - basic and diluted: ​ ​ ​ ​ ​ ​ ​ ​ ​ Net income from continuing operations attributable to common shareholders -Basic ​ $ 3.17 ​ $ 8.85 ​ $ 9.25 Dividends declared ​ ​ (3.60) ​ ​ (3.60) ​ ​ (3.60) Undistributed earnings ​ $ (0.43) ​ $ 5.25 ​ $ 5.65 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Net income from continuing operations attributable to common shareholders -Diluted ​ $ 3.15 ​ $ 8.80 ​ $ 9.18 Dividends declared ​ ​ (3.60) ​ ​ (3.60) ​ ​ (3.60) Undistributed earnings ​ $ (0.45) ​ $ 5.20 ​ $ 5.58 ​ Diluted EPS excludes non vested performance stock grants with exercise prices and exercise tax benefits greater than the average market price of the Company’s common stock during the period because their inclusion would be anti-dilutive. There were no anti-dilutive non-vested performance stock grants for the years ended December 31, 2022, 2021 and 2020. ​
Share-Based Compensation	Share-Based Compensation ASC 718, Compensation —Stock Compensation (“ASC 718”), requires the Company to measure and recognize the cost of employee services received in exchange for an award of equity instruments. Under the provisions of ASC 718, share-based compensation cost is measured at the grant date, based on the fair value of the award, and is recognized as an expense over the requisite service period (generally the vesting period of the equity grant). ​ See Note 7 for further information regarding share-based compensation.
Use of Estimates	Use of Estimates The preparation of financial statements in conformity with GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities at the date of the financial statements and reported amounts of revenues and expenses during the reporting period. Actual results could differ from those estimates.
Recent Accounting Pronouncements	Recent Accounting Pronouncements In December 2019, the Financial Accounting Standards Board issued Accounting Standards Update (“ASU”) 2019-12, Income Taxes (Topic 740): Simplifying the Accounting for Income Taxes ​ On March 20, 2019, the SEC adopted amendments to Regulation S-K and related rules and forms to modernize and simplify certain disclosure requirements for public companies. The amendments are intended to reduce the costs and burdens of the disclosure process and while continuing to require disclosure of all material information. The amended rules generally were effective on May 2, 2019 and reduced disclosures but some provisions added new requirements. On August 26, 2020, the SEC adopted additional amendments to Regulation S-K to modernize certain disclosure requirements relating to the description of business, legal proceedings and risk factors which are required to be disclosed in the Form 10-K. The amended rules are effective for filings on or after November 9, 2020. The adoption of the new rules did not have a material impact on the Company’s financial position, results of operations, cash flows, or disclosures. ​ In August 2018, the FASB issued ASU 2018-13, Fair Value Measurement (Topic 820): Disclosure Framework—Changes to the Disclosure Requirements for Fair Value Measurement In June 2016, the FASB issued ASU 2016-13, Financial Instruments – Credit Losses (Topic 326): Measurement of Credit Losses on Financial Statements ​
Segments	Segments independent agents and offers other personal and commercial insurance as complementary products. In accordance with ASC 280, Segment Reporting,

Summary of Significant Accoun_3

Summary of Significant Accounting Policies (Tables)	12 Months Ended
	Dec. 31, 2022
Earnings per Weighted Average Common Share
Computation of basic and diluted EPS	​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Years Ended December 31, ​ ​ ​ 2022 ​ ​ 2021 ​ ​ 2020 Earnings attributable to common shareholders - basic and diluted: ​ ​ ​ ​ ​ ​ ​ ​ ​ Net income from continuing operations ​ $ 46,561 ​ $ 130,710 ​ $ 138,211 Allocation for participating shares ​ ​ (205) ​ ​ 575 ​ ​ 636 Net income from continuing operations attributed to common shareholders ​ $ 46,356 ​ $ 131,285 ​ $ 138,847 Earnings per share denominator - basis and diluted ​ ​ ​ ​ ​ ​ ​ ​ ​ Total weighted average common shares outstanding, including participating shares ​ ​ 14,672,234 ​ ​ 14,894,532 ​ ​ 15,071,955 Less: weighted average participating shares ​ ​ (64,751) ​ ​ (65,796) ​ ​ (69,200) Basic earnings per share denominator ​ ​ 14,607,483 ​ ​ 14,828,736 ​ ​ 15,002,755 Common equivalent shares- non-vested performance stock grants ​ 103,128 ​ 96,990 ​ 116,272 Diluted earnings per share denominator ​ 14,710,611 ​ 14,925,726 ​ 15,119,027 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Basic earnings per share ​ $ 3.17 ​ $ 8.85 ​ $ 9.25 Diluted earnings per share ​ $ 3.15 ​ $ 8.80 ​ $ 9.18 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Undistributed earnings attributable to common shareholders - basic and diluted: ​ ​ ​ ​ ​ ​ ​ ​ ​ Net income from continuing operations attributable to common shareholders -Basic ​ $ 3.17 ​ $ 8.85 ​ $ 9.25 Dividends declared ​ ​ (3.60) ​ ​ (3.60) ​ ​ (3.60) Undistributed earnings ​ $ (0.43) ​ $ 5.25 ​ $ 5.65 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Net income from continuing operations attributable to common shareholders -Diluted ​ $ 3.15 ​ $ 8.80 ​ $ 9.18 Dividends declared ​ ​ (3.60) ​ ​ (3.60) ​ ​ (3.60) Undistributed earnings ​ $ (0.45) ​ $ 5.20 ​ $ 5.58 ​

Investments (Tables)

Investments (Tables)	12 Months Ended
	Dec. 31, 2022
Investments
Gross unrealized gains and losses on investments in securities	​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ As of December 31, 2022 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Cost or Allowance for Gross Unrealized Estimated ​ ​ Amortized ​ Expected Credit ​ ​ ​ ​ ​ Fair ​ ​ Cost ​ Losses ​ Gains ​ Losses ​ Value U.S. Treasury securities ​ $ 1,825 ​ $ — ​ $ — ​ $ (156) ​ $ 1,669 Obligations of states and political subdivisions ​ 57,319 ​ — ​ 282 ​ (3,532) ​ 54,069 Residential mortgage-backed securities (1) ​ 259,878 ​ — ​ 385 ​ (25,761) ​ 234,502 Commercial mortgage-backed securities ​ 156,303 ​ — ​ 107 ​ (16,479) ​ 139,931 Other asset-backed securities ​ 74,160 ​ — ​ — ​ (5,429) ​ 68,731 Corporate and other securities ​ 603,294 ​ (678) ​ 740 ​ (52,103) ​ 551,253 Subtotal, fixed maturity securities ​ 1,152,779 ​ (678) ​ 1,514 ​ (103,460) ​ 1,050,155 Equity securities (2) ​ 231,444 ​ — ​ 31,857 ​ (23,146) ​ 240,155 Other invested assets (4) ​ 112,850 ​ — ​ — ​ — ​ 112,850 Totals ​ $ 1,497,073 ​ $ (678) ​ $ 33,371 ​ $ (126,606) ​ $ 1,403,160 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ As of December 31, 2021 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Cost or Allowance for Gross Unrealized Estimated ​ ​ Amortized ​ Expected Credit ​ ​ ​ ​ ​ Fair ​ ​ Cost ​ Losses ​ Gains ​ Losses (3) ​ Value U.S. Treasury securities ​ $ 318 ​ $ — ​ $ 6 ​ $ — ​ $ 324 Obligations of states and political subdivisions ​ 111,578 ​ — ​ 4,847 ​ (123) ​ 116,302 Residential mortgage-backed securities (1) ​ 237,026 ​ — ​ 5,941 ​ (1,503) ​ 241,464 Commercial mortgage-backed securities ​ 146,318 ​ — ​ 5,007 ​ (442) ​ 150,883 Other asset-backed securities ​ 83,376 ​ — ​ 475 ​ (255) ​ 83,596 Corporate and other securities ​ 609,241 ​ (691) ​ 20,647 ​ (3,487) ​ 625,710 Subtotal, fixed maturity securities ​ 1,187,857 ​ (691) ​ 36,923 ​ (5,810) ​ 1,218,279 Equity securities (2) ​ 211,848 ​ — ​ 54,861 ​ (1,764) ​ 264,945 Other invested assets (4) ​ 87,911 ​ — ​ — ​ — ​ 87,911 Totals ​ $ 1,487,616 ​ $ (691) ​ $ 91,784 ​ $ (7,574) ​ $ 1,571,135 (1) Residential mortgage-backed securities consists primarily of obligations of U.S. Government agencies including collateralized mortgage obligations issued, guaranteed and/or insured by the following issuers: Government National Mortgage Association (GNMA), Federal Home Loan Mortgage Corporation (FHLMC), Federal National Mortgage Association (FNMA) and the Federal Home Loan Bank (FHLB). (2) Equity securities include common stock, preferred stock, mutual funds and interests in mutual funds held to fund the Company’s executive deferred compensation plan. (3) The Company’s investment portfolio included 1,195 and 444 securities in an unrealized loss position at December 31, 2022 and December 31, 2021, respectively. (4) Other invested assets are accounted for under the equity method which approximates fair value. ​
Amortized cost and the estimated fair value of fixed maturity securities, by maturity	​ ​ ​ ​ ​ ​ ​ ​ ​ ​ As of December 31, 2022 ​ Amortized Estimated ​ ​ Cost ​ Fair Value Due in one year or less ​ $ 4,899 ​ $ 4,665 Due after one year through five years ​ 289,109 ​ 269,852 Due after five years through ten years ​ 328,816 ​ 296,368 Due after ten years through twenty years ​ 38,044 ​ 34,623 Due after twenty years ​ 1,570 ​ 1,483 Asset-backed securities ​ 490,341 ​ 443,164 Totals ​ $ 1,152,779 ​ $ 1,050,155 ​
Gross realized gains and losses on sales of investments	​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Years Ended December 31, ​ 2022 2021 2020 Gross realized gains ​ ​ ​ ​ ​ ​ ​ ​ ​ Fixed maturity securities ​ $ 1,511 ​ $ 3,666 ​ $ 1,645 Equity securities ​ 12,367 ​ 12,275 ​ 6,864 Gross realized losses ​ ​ ​ ​ ​ ​ ​ ​ ​ Fixed maturity securities ​ (2,987) ​ (1,036) ​ (2,166) Equity securities ​ (1,701) ​ (20) ​ (5,386) Net realized gains on investments ​ $ 9,190 ​ $ 14,885 ​ $ 957 ​
Gross unrealized losses included in the Company's investment portfolio and the fair value of those securities	​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ As of December 31, 2022 ​ ​ Less than 12 Months ​ 12 Months or More ​ Total ​ Estimated Unrealized Estimated Unrealized Estimated Unrealized ​ ​ Fair Value ​ Losses ​ Fair Value ​ Losses ​ Fair Value ​ Losses U.S. Treasury securities ​ $ 1,669 ​ $ 156 ​ $ — ​ $ — ​ $ 1,669 ​ $ 156 Obligations of states and political subdivisions ​ 34,178 ​ 2,504 ​ 3,072 ​ 1,028 ​ 37,250 ​ 3,532 Residential mortgage-backed securities ​ 140,855 ​ 12,254 ​ 70,956 ​ 13,507 ​ 211,811 ​ 25,761 Commercial mortgage-backed securities ​ 110,073 ​ 11,632 ​ 24,653 ​ 4,847 ​ 134,726 ​ 16,479 Other asset-backed securities ​ 41,113 ​ ​ 2,358 ​ ​ 27,618 ​ ​ 3,071 ​ ​ 68,731 ​ ​ 5,429 Corporate and other securities ​ 386,401 ​ 28,048 ​ 131,046 ​ 24,055 ​ 517,447 ​ 52,103 Subtotal, fixed maturity securities ​ 714,289 ​ 56,952 ​ 257,345 ​ 46,508 ​ 971,634 ​ 103,460 Equity securities ​ 116,881 ​ 21,198 ​ 6,209 ​ 1,948 ​ 123,090 ​ 23,146 Total temporarily impaired securities ​ $ 831,170 ​ $ 78,150 ​ $ 263,554 ​ $ 48,456 ​ $ 1,094,724 ​ $ 126,606 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ As of December 31, 2021 ​ ​ Less than 12 Months ​ 12 Months or More ​ Total ​ Estimated Unrealized Estimated Unrealized Estimated Unrealized ​ ​ Fair Value ​ Losses ​ Fair Value ​ Losses ​ Fair Value ​ Losses U.S. Treasury securities ​ $ — ​ $ — ​ $ — ​ $ — ​ $ — ​ $ — Obligations of states and political subdivisions ​ 2,985 ​ 85 ​ 1,012 ​ 38 ​ 3,997 ​ 123 Residential mortgage-backed securities ​ 97,116 ​ 1,502 ​ 11 ​ 1 ​ 97,127 ​ 1,503 Commercial mortgage-backed securities ​ 29,660 ​ 442 ​ — ​ — ​ 29,660 ​ 442 Other asset-backed securities ​ 39,266 ​ ​ 255 ​ ​ — ​ ​ — ​ 39,266 ​ 255 Corporate and other securities ​ 181,470 ​ 3,140 ​ 11,436 ​ 347 ​ 192,906 ​ 3,487 Subtotal, fixed maturity securities ​ 350,497 ​ 5,424 ​ 12,459 ​ 386 ​ 362,956 ​ 5,810 Equity securities ​ 19,457 ​ 1,559 ​ 1,029 ​ 205 ​ 20,486 ​ 1,764 Total temporarily impaired securities ​ $ 369,954 ​ $ 6,983 ​ $ 13,488 ​ $ 591 ​ $ 383,442 ​ $ 7,574
Reconciliation of beginning and ending balances of allowance for expected credit losses on fixed maturities classified as available for sale	​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Year Ended December 31, ​ ​ ​ 2022 ​ ​ 2021 Beginning of period ​ $ 691 ​ $ 1,054 Credit losses on securities with no previously recorded credit losses ​ ​ 193 ​ ​ 9 Net increases (decreases) in allowance on previously impaired securities ​ 98 ​ ​ (137) Reduction due to sales ​ ​ (304) ​ ​ (235) Writeoffs charged against allowance ​ — ​ ​ — Recoveries of amounts previously written off ​ — ​ ​ — Ending balance of period ​ $ 678 ​ $ 691 ​
Components of net investment income	​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Years Ended December 31, ​ 2022 2021 2020 Interest on fixed maturity securities ​ $ 40,886 ​ $ 36,160 ​ $ 37,727 Dividends on equity securities ​ 6,746 ​ 6,421 ​ 5,044 Equity in earnings of other invested assets ​ 2,304 ​ 4,895 ​ 1,378 Interest on other assets ​ 61 ​ 22 ​ 27 Total Investment Income ​ 49,997 ​ 47,498 ​ 44,176 Investment expenses ​ 3,272 ​ 3,363 ​ 3,131 Net investment income ​ $ 46,725 ​ $ 44,135 ​ $ 41,045

Allowance for Expected Credit_2

Allowance for Expected Credit Losses (Tables)	12 Months Ended
	Dec. 31, 2022
Allowance for Expected Credit Losses
Accounts receivable, net of allowance for expected credit losses	​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ At and For the ​ ​ At and For the ​ ​ ​ Year Ended December 31, 2022 ​ ​ Year ended December 31, 2021 ​ ​ Accounts Receivable Net of Allowance for Expected Credit Losses ​ ​ Allowance for Expected Credit Losses ​ ​ Accounts Receivable Net of Allowance for Expected Credit Losses ​ ​ Allowance for Expected Credit Losses Balance, beginning of period ​ $ 170,953 ​ $ 1,808 ​ $ 179,147 ​ $ 1,754 Current period change for expected credit losses ​ ​ ​ 1,339 ​ ​ ​ 2,339 Writeoffs of uncollectable accounts receivable ​ ​ ​ (1,701) ​ ​ ​ (2,285) Balance, end of period ​ $ 192,542 ​ $ 1,446 ​ $ 170,953 ​ $ 1,808 ​

Equipment and Leasehold Impro_2

Equipment and Leasehold Improvements (Tables)	12 Months Ended
	Dec. 31, 2022
Equipment and Leasehold Improvements
Schedule of carrying value of equipment and leasehold improvements by classification	​ ​ ​ ​ ​ ​ ​ ​ ​ ​ As of December 31, ​ ​ 2022 ​ 2021 Software $ 58,079 $ 57,463 Computer equipment ​ 15,649 ​ 15,425 Leasehold improvements ​ 8,264 ​ 8,264 Other equipment ​ 3,132 ​ 3,132 Furniture and fixtures ​ 4,346 ​ 4,346 Total cost ​ 89,470 ​ 88,630 Less accumulated depreciation and amortization ​ 71,342 ​ 65,188 Equipment and leasehold improvements, net ​ $ 18,128 ​ $ 23,442 ​

Share-Based Compensation (Table

Share-Based Compensation (Tables)	12 Months Ended
	Dec. 31, 2022
Share-Based Compensation
Schedule of restricted stock and performance-based restricted stock activity	​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Years Ended December 31, ​ ​ 2022 ​ 2021 ​ 2020 ​ Shares Weighted ​ Shares Weighted Shares ​ Weighted ​ ​ Under ​ Average ​ Under ​ Average Under ​ Average ​ ​ Restriction ​ Fair Value ​ Restriction ​ Fair Value Restriction ​ Fair Value Outstanding at beginning of year 65,171 ​ $ 84.30 ​ 66,550 ​ $ 85.16 ​ 78,202 ​ $ 79.09 Granted 38,864 ​ ​ 85.22 ​ 39,840 ​ ​ 79.27 ​ 34,799 ​ ​ 90.10 Vested and unrestricted (38,328) ​ ​ 86.02 ​ (40,763) ​ ​ 80.82 ​ (43,757) ​ ​ 78.10 Forfeited ​ (2,294) ​ ​ 83.10 ​ (456) ​ ​ 81.17 ​ (2,694) ​ ​ 87.70 Outstanding at end of period 63,413 ​ $ 83.87 ​ 65,171 ​ $ 84.30 ​ 66,550 ​ $ 85.16 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Years Ended December 31, ​ ​ 2022 ​ 2021 ​ 2020 ​ Performance-based Weighted Performance-based Weighted Performance-based ​ Weighted ​ ​ Shares Under ​ Average ​ Shares Under ​ Average ​ Shares Under ​ Average ​ ​ Restriction ​ Fair Value ​ Restriction ​ Fair Value ​ Restriction ​ Fair Value Outstanding at beginning of year 72,418 ​ $ 86.53 71,964 ​ $ 84.94 ​ 84,105 ​ $ 79.34 Granted (1) 31,828 ​ ​ 86.35 49,460 ​ ​ 77.56 ​ 36,649 ​ ​ 84.68 Vested and unrestricted (26,504) ​ ​ 92.52 (48,666) ​ ​ 75.05 ​ (42,123) ​ ​ 73.55 Forfeited ​ (2,673) ​ ​ 83.01 ​ (340) ​ ​ 87.43 ​ (6,667) ​ ​ 84.86 Outstanding at end of period 75,069 ​ $ 84.46 72,418 ​ $ 86.53 ​ 71,964 ​ $ 84.94 ​ (1) Includes a true-up of previously awarded performance-based restricted share awards. The updated shares were calculated based on the attainment of pre-established performance objectives. ​ ​ ​ ​

Leases (Tables)

Leases (Tables)	12 Months Ended
	Dec. 31, 2022
Leases
Schedule of operating lease cost	​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Year Ended December 31, ​ ​ 2022 ​ ​ 2021 ​ ​ 2020 Operating lease cost ​ ​ $ 4,214 ​ $ 4,464 ​ $ 4,591 ​
Schedule of other information related to leases	​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Year Ended December 31, ​ ​ 2022 ​ ​ 2021 ​ ​ 2020 Cash paid for amounts included in the measurement of lease liabilities: ​ ​ ​ ​ ​ ​ ​ ​ ​ Operating cash flows from operating leases ​ $ 4,757 ​ $ 4,979 ​ $ 5,073 Weighted average remaining lease term ​ ​ ​ ​ ​ ​ ​ ​ ​ Operating leases ​ ​ 5.75 Years ​ ​ 6.65 Years ​ ​ 7.57 Years Weighted average discount rate ​ ​ ​ ​ ​ ​ ​ ​ ​ Operating leases ​ ​ 2.39% ​ ​ 2.34% ​ ​ 2.33% ​
Schedule of the maturities of lease liabilities	​ ​ ​ ​ ​ ​ Operating Leases 2023 ​ $ 4,521 2024 ​ ​ 4,269 2025 ​ ​ 3,867 2026 ​ ​ 3,857 2027 ​ ​ 3,857 Thereafter ​ ​ 3,860 Total lease payments ​ ​ 24,231 Less imputed interest ​ ​ (895) Total ​ $ 23,336

Reinsurance (Tables)

Reinsurance (Tables)	12 Months Ended
	Dec. 31, 2022
Reinsurance
Schedule of effect of assumed and ceded premiums on net written and earned premiums and losses and LAE incurred	​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Years Ended December 31, ​ 2022 2021 2020 Written Premiums ​ ​ ​ ​ ​ ​ ​ ​ ​ Direct ​ $ 823,318 ​ $ 802,139 ​ $ 798,712 Assumed ​ 28,835 ​ 31,359 ​ 26,316 Ceded ​ (78,418) ​ (68,972) ​ (61,491) Net written premiums ​ $ 773,735 ​ $ 764,526 ​ $ 763,537 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Earned Premiums ​ ​ ​ ​ ​ ​ ​ ​ ​ Direct ​ $ 803,289 ​ $ 811,329 ​ $ 815,981 Assumed ​ 28,976 ​ 30,583 ​ 29,365 Ceded ​ (73,760) ​ (67,584) ​ (74,268) Net earned premiums ​ $ 758,505 ​ $ 774,328 ​ $ 771,078 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Loss and LAE ​ ​ ​ ​ ​ ​ ​ ​ ​ Direct ​ $ 515,535 ​ $ 473,162 ​ $ 428,018 Assumed ​ 18,627 ​ 16,873 ​ 18,595 Ceded ​ (42,183) ​ (28,308) ​ (42,057) Net loss and LAE ​ $ 491,979 ​ $ 461,727 ​ $ 404,556

Loss and Loss Adjustment Expe_2

Loss and Loss Adjustment Expense Reserves (Tables)	12 Months Ended
	Dec. 31, 2022
Loss and Loss Adjustment Expense Reserves
Schedule of reconciliation of beginning and ending reserves for losses and loss adjustment expenses (LAE)	​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Year Ended December 31, ​ 2022 2021 ​ 2020 Reserves for losses and LAE at beginning of year ​ $ 570,651 ​ $ 567,581 ​ $ 610,566 Less receivable from reinsurers related to unpaid losses and LAE ​ (90,667) ​ (106,311) ​ ​ (122,372) Net reserves for losses and LAE at beginning of year ​ 479,984 ​ 461,270 ​ ​ 488,194 Incurred losses and LAE, related to: ​ ​ ​ ​ ​ ​ ​ ​ ​ Current year ​ 549,258 ​ 515,400 ​ ​ 459,400 Prior years ​ (57,279) ​ (53,673) ​ ​ (54,844) Total incurred losses and LAE ​ 491,979 ​ 461,727 ​ ​ 404,556 Paid losses and LAE related to: ​ ​ ​ ​ ​ ​ ​ ​ ​ Current year ​ 342,971 ​ 310,116 ​ ​ 277,754 Prior years ​ 172,788 ​ 132,897 ​ ​ 153,726 Total paid losses and LAE ​ 515,759 ​ 443,013 ​ ​ 431,480 Net reserves for losses and LAE at end of period ​ 456,204 ​ 479,984 ​ ​ 461,270 Plus receivable from reinsurers related to unpaid losses and LAE ​ 93,394 ​ 90,667 ​ ​ 106,311 Reserves for losses and LAE at end of period ​ $ 549,598 ​ $ 570,651 ​ $ 567,581 ​
Schedule of incurred and paid claims development	​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Private Passenger Automobile Liability ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance ​ ​ ​ ​ ​ ​ ​ As of December 31, 2022 ​ ​ ​ ​ For the Years Ended December 31, ​ ​ ​ Total of Incurred-but-Not-Reported Liabilities Plus Expected Development of Reported Claims Cumulative Number of Reported Claims Accident Year ​ 2013 ​ 2014 ​ 2015 ​ 2016 ​ 2017 ​ 2018 ​ 2019 ​ 2020 ​ 2021 ​ 2022 ​ ​ ​ ​ ​ (Unaudited) ​ ​ ​ ​ ​ ​ ​ 2013 ​ $ 183,367 ​ $ 183,517 ​ $ 183,264 ​ $ 181,492 ​ $ 179,167 ​ $ 176,713 ​ $ 175,684 ​ $ 175,718 ​ $ 175,362 ​ $ 175,374 ​ ($ 84) 54,248 2014 ​ ​ ​ 187,305 ​ 187,104 ​ 186,798 ​ 183,119 ​ 181,312 ​ 179,251 ​ 179,267 ​ 179,268 ​ 179,264 ​ (336) 52,787 2015 ​ ​ ​ ​ ​ 190,036 ​ 190,236 ​ 188,317 ​ 184,477 ​ 181,299 ​ 179,451 ​ 179,248 ​ 178,951 ​ (204) 52,980 2016 ​ ​ ​ ​ ​ ​ ​ 192,912 ​ 192,318 ​ 185,009 ​ 180,486 ​ 177,009 ​ 176,600 ​ 176,700 ​ (392) 49,386 2017 ​ ​ ​ ​ ​ ​ ​ ​ ​ 185,673 ​ 184,429 ​ 182,068 ​ 177,941 ​ 177,320 ​ 176,564 ​ (1,723) 46,257 2018 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ 176,411 ​ 175,222 ​ 170,447 ​ 168,185 ​ 166,046 ​ (3,040) 43,085 2019 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ 176,171 ​ 174,439 ​ 170,477 ​ 166,940 ​ (4,648) 40,564 2020 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ 130,335 ​ 125,888 ​ 120,060 ​ (5,880) 26,172 2021 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ 146,997 ​ 147,391 ​ (18,015) 29,994 2022 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ 157,921 ​ 2,617 27,388 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Total ​ $ 1,645,211 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Private Passenger Automobile Liability ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ For the Years Ended December 31, ​ ​ ​ Accident Year ​ 2013 ​ 2014 ​ 2015 ​ 2016 ​ 2017 ​ 2018 ​ 2019 ​ 2020 ​ 2021 ​ 2022 ​ ​ ​ (Unaudited) ​ ​ ​ ​ ​ 2013 ​ $ 79,049 ​ $ 135,031 ​ $ 152,472 ​ $ 163,694 ​ $ 169,634 ​ $ 172,736 ​ $ 173,890 ​ $ 174,574 ​ $ 174,639 ​ $ 174,858 ​ 2014 ​ ​ ​ 79,151 ​ 136,434 ​ 156,693 ​ 166,815 ​ 173,163 ​ 176,616 ​ 177,360 ​ 177,968 ​ 178,324 ​ 2015 ​ ​ ​ ​ ​ 76,934 ​ 138,255 ​ 156,483 ​ 168,641 ​ 173,816 ​ 176,652 ​ 177,782 ​ 178,357 ​ 2016 ​ ​ ​ ​ ​ ​ ​ 78,862 ​ 137,917 ​ 154,964 ​ 167,458 ​ 171,865 ​ 174,410 ​ 175,803 ​ 2017 ​ ​ ​ ​ ​ ​ ​ ​ ​ 77,519 ​ 133,037 ​ 153,675 ​ 164,467 ​ 169,024 ​ 172,362 ​ 2018 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ 72,895 ​ 126,456 ​ 143,656 ​ 154,169 ​ 159,066 ​ 2019 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ 72,219 ​ 127,910 ​ 143,570 ​ 154,633 ​ 2020 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ 52,962 ​ 88,037 ​ 102,601 ​ 2021 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ 56,826 ​ 111,516 ​ 2022 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ 61,227 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Total ​ $ 1,468,747 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ All outstanding liabilities before 2013, net of reinsurance ​ 346 ​ ​ ​ ​ ​ ​ ​ Liabilities for claims and claim adjustment expenses, net of reinsurance ​ $ 176,810 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Private Passenger Automobile Physical Damage ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance ​ ​ ​ ​ ​ ​ ​ As of December 31, 2022 ​ ​ ​ ​ For the Years Ended December 31, ​ ​ ​ Total of Incurred-but-Not-Reported Liabilities Plus Expected Development of Reported Claims Cumulative Number of Reported Claims Accident Year ​ 2013 ​ 2014 ​ 2015 ​ 2016 ​ 2017 ​ 2018 ​ 2019 ​ 2020 ​ 2021 ​ 2022 ​ ​ ​ ​ ​ (Unaudited) ​ ​ ​ ​ ​ ​ ​ 2013 ​ $ 114,389 ​ $ 114,239 ​ $ 113,034 ​ $ 112,197 ​ $ 112,096 ​ $ 112,060 ​ $ 112,029 ​ $ 112,003 ​ $ 111,989 ​ $ 111,970 ​ $ - 131,703 2014 ​ ​ ​ 123,421 ​ 123,622 ​ 122,410 ​ 122,327 ​ 122,341 ​ 122,213 ​ 122,188 ​ 122,182 ​ 122,163 ​ - 135,006 2015 ​ ​ ​ ​ ​ 140,219 ​ 136,661 ​ 134,101 ​ 133,737 ​ 133,581 ​ 133,530 ​ 133,523 ​ 133,552 ​ (3) 144,276 2016 ​ ​ ​ ​ ​ ​ ​ 129,528 ​ 124,922 ​ 122,116 ​ 121,717 ​ 121,543 ​ 121,570 ​ 121,615 ​ (5) 126,091 2017 ​ ​ ​ ​ ​ ​ ​ ​ ​ 128,340 ​ 126,304 ​ 124,128 ​ 123,715 ​ 123,777 ​ 123,779 ​ (35) 124,026 2018 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ 129,450 ​ 130,145 ​ 128,426 ​ 128,090 ​ 128,003 ​ (63) 119,760 2019 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ 128,698 ​ 126,648 ​ 124,332 ​ 123,858 ​ (116) 117,022 2020 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ 98,546 ​ 97,244 ​ 97,644 ​ (451) 81,852 2021 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ 122,943 ​ 122,549 ​ (1,379) 89,521 2022 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ 141,041 ​ (23,926) 92,198 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Total ​ $ 1,226,174 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Private Passenger Automobile Physical Damage ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ For the Years Ended December 31, ​ ​ Accident Year ​ 2013 ​ 2014 ​ 2015 ​ 2016 ​ 2017 ​ 2018 ​ 2019 ​ 2020 ​ 2021 ​ 2022 ​ ​ (Unaudited) ​ ​ ​ ​ 2013 ​ $ 120,843 ​ $ 115,904 ​ $ 112,894 ​ $ 112,162 ​ $ 112,085 ​ $ 112,060 ​ $ 112,029 ​ $ 112,003 ​ $ 111,988 ​ $ 111,970 2014 ​ ​ ​ 130,732 ​ 126,414 ​ 122,668 ​ 122,402 ​ 122,350 ​ 122,251 ​ 122,216 ​ 122,189 ​ 122,163 2015 ​ ​ ​ ​ ​ 143,532 ​ 136,760 ​ 134,066 ​ 133,701 ​ 133,639 ​ 133,596 ​ 133,575 ​ 133,555 2016 ​ ​ ​ ​ ​ ​ ​ 133,530 ​ 124,298 ​ 122,023 ​ 121,795 ​ 121,660 ​ 121,634 ​ 121,618 2017 ​ ​ ​ ​ ​ ​ ​ ​ ​ 132,409 ​ 126,822 ​ 124,286 ​ 123,844 ​ 123,839 ​ 123,795 2018 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ 138,036 ​ 132,591 ​ 128,624 ​ 128,154 ​ 128,054 2019 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ 134,429 ​ 128,173 ​ 124,467 ​ 123,974 2020 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ 102,764 ​ 98,819 ​ 98,083 2021 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ 123,636 ​ 123,847 2022 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ 142,002 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Total ​ $ 1,229,061 ​ ​ ​ ​ ​ ​ ​ ​ ​ All outstanding liabilities before 2013, net of reinsurance ​ - ​ ​ ​ ​ ​ ​ Liabilities for claims and claim adjustment expenses, net of reinsurance ​ ($ 2,887) ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Commercial Automobile Liability ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance ​ ​ ​ ​ ​ ​ ​ As of December 31, 2022 ​ ​ ​ ​ For the Years Ended December 31, ​ ​ ​ Total of Incurred-but-Not-Reported Liabilities Plus Expected Development of Reported Claims Cumulative Number of Reported Claims Accident Year ​ 2013 ​ 2014 ​ 2015 ​ 2016 ​ 2017 ​ 2018 ​ 2019 ​ 2020 ​ 2021 ​ 2022 ​ ​ ​ ​ ​ (Unaudited) ​ ​ ​ ​ ​ ​ ​ 2013 ​ $ 29,175 ​ $ 29,541 ​ $ 28,377 ​ $ 26,864 ​ $ 26,310 ​ $ 25,986 ​ $ 25,443 ​ $ 25,353 ​ $ 25,140 ​ $ 25,052 ​ $ 1 5,784 2014 ​ ​ ​ 34,117 ​ 34,105 ​ 34,376 ​ 33,914 ​ 32,948 ​ 32,438 ​ 32,200 ​ 32,052 ​ 32,313 ​ 2 6,086 2015 ​ ​ ​ ​ ​ 35,371 ​ 36,150 ​ 36,610 ​ 37,730 ​ 38,015 ​ 38,257 ​ 37,995 ​ 37,630 ​ (62) 7,212 2016 ​ ​ ​ ​ ​ ​ ​ 37,954 ​ 39,416 ​ 40,947 ​ 40,916 ​ 40,679 ​ 40,996 ​ 40,767 ​ 56 6,457 2017 ​ ​ ​ ​ ​ ​ ​ ​ ​ 42,865 ​ 41,373 ​ 41,055 ​ 39,369 ​ 39,232 ​ 38,185 ​ (6) 6,134 2018 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ 41,347 ​ 40,115 ​ 38,589 ​ 37,322 ​ 36,014 ​ 107 5,744 2019 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ 51,679 ​ 49,163 ​ 48,783 ​ 46,964 ​ 666 5,682 2020 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ 35,010 ​ 31,930 ​ 30,869 ​ 2,867 3,463 2021 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ 41,814 ​ 39,564 ​ 229 4,260 2022 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ 43,496 ​ 12,054 3,893 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Total ​ $ 370,854 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Commercial Automobile Liability ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ For the Years Ended December 31, ​ ​ Accident Year ​ 2013 ​ 2014 ​ 2015 ​ 2016 ​ 2017 ​ 2018 ​ 2019 ​ 2020 ​ 2021 ​ 2022 ​ ​ (Unaudited) ​ ​ ​ ​ 2013 ​ $ 8,502 ​ $ 17,079 ​ $ 19,625 ​ $ 21,129 ​ $ 22,434 ​ $ 23,867 ​ $ 24,507 ​ $ 24,732 ​ $ 24,789 ​ $ 24,799 2014 ​ ​ ​ 9,426 ​ 17,853 ​ 21,968 ​ 25,253 ​ 27,886 ​ 30,420 ​ 31,298 ​ 31,451 ​ 32,085 2015 ​ ​ ​ ​ ​ 11,181 ​ 21,700 ​ 26,018 ​ 29,804 ​ 31,537 ​ 33,416 ​ 34,976 ​ 35,302 2016 ​ ​ ​ ​ ​ ​ ​ 9,991 ​ 19,902 ​ 25,711 ​ 32,274 ​ 36,237 ​ 38,275 ​ 39,233 2017 ​ ​ ​ ​ ​ ​ ​ ​ ​ 10,407 ​ 20,106 ​ 24,409 ​ 28,721 ​ 31,389 ​ 33,569 2018 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ 9,704 ​ 18,499 ​ 23,544 ​ 26,774 ​ 29,336 2019 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ 12,113 ​ 22,480 ​ 28,373 ​ 36,048 2020 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ 7,025 ​ 13,166 ​ 16,268 2021 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ 7,883 ​ 17,925 2022 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ 10,941 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Total ​ $ 275,506 ​ ​ ​ ​ ​ ​ ​ ​ ​ All outstanding liabilities before 2013, net of reinsurance ​ - ​ ​ ​ ​ ​ ​ Liabilities for claims and claim adjustment expenses, net of reinsurance ​ $ 95,348 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Commercial Automobile Physical Damage ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance ​ ​ ​ ​ ​ ​ ​ As of December 31, 2022 ​ ​ ​ ​ For the Years Ended December 31, ​ ​ ​ Total of Incurred-but-Not-Reported Liabilities Plus Expected Development of Reported Claims Cumulative Number of Reported Claims Accident Year ​ 2013 ​ 2014 ​ 2015 ​ 2016 ​ 2017 ​ 2018 ​ 2019 ​ 2020 ​ 2021 ​ 2022 ​ ​ ​ ​ ​ (Unaudited) ​ ​ ​ ​ ​ ​ ​ 2013 ​ $ 13,666 ​ $ 13,567 ​ $ 13,298 ​ $ 13,180 ​ $ 13,057 ​ $ 13,047 ​ $ 13,071 ​ $ 13,057 ​ $ 13,057 ​ $ 13,055 ​ $ - 12,298 2014 ​ ​ ​ 17,426 ​ 16,925 ​ 15,455 ​ 15,419 ​ 15,353 ​ 15,381 ​ 15,373 ​ 15,376 ​ 15,376 ​ - 13,545 2015 ​ ​ ​ ​ ​ 20,223 ​ 19,047 ​ 19,021 ​ 18,974 ​ 18,641 ​ 18,535 ​ 18,525 ​ 18,523 ​ - 15,468 2016 ​ ​ ​ ​ ​ ​ ​ 20,216 ​ 18,506 ​ 17,909 ​ 17,808 ​ 17,725 ​ 17,713 ​ 17,721 ​ 1 13,593 2017 ​ ​ ​ ​ ​ ​ ​ ​ ​ 19,691 ​ 19,200 ​ 19,021 ​ 18,834 ​ 18,780 ​ 18,774 ​ 2 13,113 2018 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ 21,230 ​ 19,937 ​ 19,270 ​ 19,210 ​ 19,196 ​ 2 12,907 2019 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ 20,039 ​ 19,652 ​ 18,956 ​ 18,685 ​ 0 12,757 2020 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ 16,507 ​ 16,334 ​ 16,606 ​ 198 9,620 2021 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ 20,156 ​ 21,524 ​ (124) 11,494 2022 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ 27,459 ​ (345) 12,118 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Total ​ $ 186,919 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Commercial Automobile Physical Damage ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ For the Years Ended December 31, ​ ​ ​ Accident Year ​ 2013 ​ 2014 ​ 2015 ​ 2016 ​ 2017 ​ 2018 ​ 2019 ​ 2020 ​ 2021 ​ 2022 ​ ​ ​ (Unaudited) ​ ​ ​ ​ ​ 2013 ​ $ 12,665 ​ $ 13,378 ​ $ 13,114 ​ $ 13,074 ​ $ 13,065 ​ $ 13,060 ​ $ 13,066 ​ $ 13,057 ​ $ 13,057 ​ $ 13,055 ​ 2014 ​ ​ ​ 15,377 ​ 15,862 ​ 15,424 ​ 15,388 ​ 15,381 ​ 15,376 ​ 15,373 ​ 15,376 ​ 15,376 ​ 2015 ​ ​ ​ ​ ​ 17,787 ​ 18,910 ​ 18,667 ​ 18,549 ​ 18,541 ​ 18,530 ​ 18,525 ​ 18,523 ​ 2016 ​ ​ ​ ​ ​ ​ ​ 17,228 ​ 18,143 ​ 17,763 ​ 17,712 ​ 17,709 ​ 17,712 ​ 17,721 ​ 2017 ​ ​ ​ ​ ​ ​ ​ ​ ​ 17,957 ​ 19,336 ​ 18,915 ​ 18,787 ​ 18,786 ​ 18,772 ​ 2018 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ 18,842 ​ 19,842 ​ 19,236 ​ 19,208 ​ 19,194 ​ 2019 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ 18,128 ​ 19,161 ​ 18,752 ​ 18,681 ​ 2020 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ 15,550 ​ 16,596 ​ 16,407 ​ 2021 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ 18,610 ​ 21,620 ​ 2022 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ 24,381 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Total ​ $ 183,730 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ All outstanding liabilities before 2013, net of reinsurance ​ - ​ ​ ​ ​ ​ ​ ​ Liabilities for claims and claim adjustment expenses, net of reinsurance ​ $ 3,189 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Homeowners Liability ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance ​ ​ ​ ​ ​ ​ ​ As of December 31, 2022 ​ ​ ​ ​ For the Years Ended December 31, ​ ​ ​ Total of Incurred-but-Not-Reported Liabilities Plus Expected Development of Reported Claims Cumulative Number of Reported Claims Accident Year ​ 2013 ​ 2014 ​ 2015 ​ 2016 ​ 2017 ​ 2018 ​ 2019 ​ 2020 ​ 2021 ​ 2022 ​ ​ ​ ​ ​ (Unaudited) ​ ​ ​ ​ ​ ​ ​ 2013 ​ $ 9,768 ​ $ 9,768 ​ $ 9,337 ​ $ 7,578 ​ $ 5,978 ​ $ 5,312 ​ $ 5,147 ​ $ 5,147 ​ $ 5,167 ​ $ 5,096 ​ $ - 265 2014 ​ ​ ​ 11,494 ​ 11,494 ​ 9,738 ​ 7,388 ​ 7,120 ​ 6,984 ​ 6,984 ​ 6,818 ​ 6,620 ​ - 261 2015 ​ ​ ​ ​ ​ 12,965 ​ 12,555 ​ 9,908 ​ 9,201 ​ 9,201 ​ 9,201 ​ 8,172 ​ 7,582 ​ 117 288 2016 ​ ​ ​ ​ ​ ​ ​ 10,594 ​ 10,594 ​ 10,594 ​ 9,847 ​ 9,491 ​ 9,491 ​ 8,873 ​ 151 277 2017 ​ ​ ​ ​ ​ ​ ​ ​ ​ 11,276 ​ 10,058 ​ 9,328 ​ 8,585 ​ 7,819 ​ 7,053 ​ 267 269 2018 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ 9,951 ​ 9,951 ​ 9,951 ​ 9,768 ​ 8,616 ​ 375 254 2019 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ 14,130 ​ 13,848 ​ 11,949 ​ 11,371 ​ 396 261 2020 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ 14,664 ​ 13,708 ​ 11,025 ​ 700 222 2021 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ 12,797 ​ 12,797 ​ (1,094) 210 2022 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ 12,973 ​ 4,724 173 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Total ​ $ 92,006 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Homeowners Liability ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ For the Years Ended December 31, ​ ​ ​ Accident Year ​ 2013 ​ 2014 ​ 2015 ​ 2016 ​ 2017 ​ 2018 ​ 2019 ​ 2020 ​ 2021 ​ 2022 ​ ​ ​ (Unaudited) ​ ​ ​ ​ ​ 2013 ​ $ 527 ​ $ 2,337 ​ $ 3,080 ​ $ 3,493 ​ $ 3,829 ​ $ 4,038 ​ $ 4,209 ​ $ 4,247 ​ $ 4,255 ​ $ 4,267 ​ 2014 ​ ​ ​ 340 ​ 1,834 ​ 3,212 ​ 4,200 ​ 4,828 ​ 6,315 ​ 6,368 ​ 6,419 ​ 6,419 ​ 2015 ​ ​ ​ ​ ​ 428 ​ 3,319 ​ 4,267 ​ 5,205 ​ 6,445 ​ 7,022 ​ 7,215 ​ 7,302 ​ 2016 ​ ​ ​ ​ ​ ​ ​ 647 ​ 2,669 ​ 4,257 ​ 5,387 ​ 6,300 ​ 7,128 ​ 7,628 ​ 2017 ​ ​ ​ ​ ​ ​ ​ ​ ​ 305 ​ 1,676 ​ 2,913 ​ 3,593 ​ 4,217 ​ 4,765 ​ 2018 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ 551 ​ 2,039 ​ 3,972 ​ 4,597 ​ 5,664 ​ 2019 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ 1,634 ​ 3,343 ​ 5,183 ​ 6,038 ​ 2020 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ 220 ​ 3,254 ​ 3,845 ​ 2021 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ 218 ​ 3,388 ​ 2022 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ 450 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Total ​ $ 49,766 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ All outstanding liabilities before 2013, net of reinsurance ​ - ​ ​ ​ ​ ​ ​ ​ Liabilities for claims and claim adjustment expenses, net of reinsurance ​ $ 42,240 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Homeowners Property Damage ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance ​ ​ ​ ​ ​ ​ ​ As of December 31, 2022 ​ ​ ​ ​ For the Years Ended December 31, ​ ​ ​ Total of Incurred-but-Not-Reported Liabilities Plus Expected Development of Reported Claims Cumulative Number of Reported Claims Accident Year ​ 2013 ​ 2014 ​ 2015 ​ 2016 ​ 2017 ​ 2018 ​ 2019 ​ 2020 ​ 2021 ​ 2022 ​ ​ ​ ​ ​ (Unaudited) ​ ​ ​ ​ ​ ​ ​ 2013 ​ $ 56,298 ​ $ 56,199 ​ $ 55,722 ​ $ 52,464 ​ $ 51,077 ​ $ 49,973 ​ $ 49,463 ​ $ 49,456 ​ $ 49,455 ​ $ 49,453 ​ $ 126 5,698 2014 ​ ​ ​ 59,160 ​ 60,213 ​ 59,751 ​ 57,331 ​ 55,127 ​ 54,607 ​ 54,602 ​ 54,560 ​ 54,556 ​ 251 6,077 2015 ​ ​ ​ ​ ​ 152,586 ​ 152,049 ​ 162,377 ​ 162,788 ​ 162,722 ​ 162,354 ​ 162,244 ​ 162,244 ​ 462 20,076 2016 ​ ​ ​ ​ ​ ​ ​ 67,116 ​ 66,442 ​ 64,208 ​ 61,262 ​ 60,019 ​ 59,898 ​ 59,857 ​ 312 5,421 2017 ​ ​ ​ ​ ​ ​ ​ ​ ​ 80,736 ​ 76,560 ​ 70,689 ​ 68,737 ​ 67,530 ​ 67,388 ​ 385 6,011 2018 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ 83,443 ​ 82,581 ​ 77,970 ​ 74,989 ​ 73,996 ​ 461 8,239 2019 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ 77,976 ​ 73,697 ​ 68,769 ​ 65,624 ​ 705 5,452 2020 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ 80,093 ​ 76,638 ​ 72,622 ​ 344 6,108 2021 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ 75,696 ​ 75,011 ​ (8,085) 6,335 2022 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ 72,523 ​ (4,404) 4,770 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Total ​ $ 753,274 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Homeowners Property Damage ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ For the Years Ended December 31, ​ ​ ​ Accident Year ​ 2013 ​ 2014 ​ 2015 ​ 2016 ​ 2017 ​ 2018 ​ 2019 ​ 2020 ​ 2021 ​ 2022 ​ ​ ​ (Unaudited) ​ ​ ​ ​ ​ 2013 ​ $ 38,661 ​ $ 48,456 ​ $ 49,702 ​ $ 49,612 ​ $ 49,653 ​ $ 49,620 ​ $ 49,328 ​ $ 49,327 ​ $ 49,327 ​ $ 49,328 ​ 2014 ​ ​ ​ 40,409 ​ 52,161 ​ 54,088 ​ 54,224 ​ 54,262 ​ 54,274 ​ 54,306 ​ 54,305 ​ 54,306 ​ 2015 ​ ​ ​ ​ ​ 112,563 ​ 145,337 ​ 160,572 ​ 161,745 ​ 161,773 ​ 161,850 ​ 161,783 ​ 161,781 ​ 2016 ​ ​ ​ ​ ​ ​ ​ 44,103 ​ 57,238 ​ 59,155 ​ 59,449 ​ 59,403 ​ 59,428 ​ 59,493 ​ 2017 ​ ​ ​ ​ ​ ​ ​ ​ ​ 46,366 ​ 64,401 ​ 66,181 ​ 66,892 ​ 66,765 ​ 66,826 ​ 2018 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ 57,704 ​ 70,959 ​ 72,078 ​ 73,119 ​ 73,307 ​ 2019 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ 49,121 ​ 61,905 ​ 63,536 ​ 64,427 ​ 2020 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ 50,304 ​ 65,927 ​ 68,706 ​ 2021 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ 51,390 ​ 67,998 ​ 2022 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ 48,906 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Total ​ $ 715,078 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ All outstanding liabilities before 2013, net of reinsurance ​ 1,030 ​ ​ ​ ​ ​ ​ ​ Liabilities for claims and claim adjustment expenses, net of reinsurance ​ $ 39,226 ​ ​ ​ ​ ​
Schedule of unaudited supplementary information related to incurred and paid claims development	​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance (Unaudited) ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Years ​ 1 ​ 2 ​ 3 ​ 4 ​ 5 ​ 6 ​ 7 ​ 8 ​ 9 ​ 10 Private Passenger Automobile Liability ​ 43.0% ​ 32.8% ​ 10.5% ​ 6.4% ​ 3.0% ​ 1.7% ​ 0.6% ​ 0.3% ​ 0.1% ​ 0.1% Private Passenger Automobile Physical Damage ​ 106.2% ​ (4.3)% ​ (2.4)% ​ (0.3)% ​ (0.1)% ​ 0.0% ​ 0.0% ​ 0.0% ​ 0.0% ​ 0.0% Commercial Automobile Liability ​ 26.2% ​ 25.2% ​ 12.2% ​ 11.8% ​ 7.1% ​ 5.8% ​ 3.0% ​ 0.7% ​ 1.2% ​ 0.0% Commercial Automobile Physical Damage ​ 94.4% ​ 6.7% ​ (2.1)% ​ (0.4)% ​ 0.0% ​ 0.0% ​ 0.0% ​ 0.0% ​ 0.0% ​ 0.0% Homeowners Liability ​ 5.8% ​ 24.0% ​ 15.5% ​ 10.2% ​ 11.0% ​ 10.4% ​ 3.2% ​ 0.9% ​ 0.1% ​ 0.3% Homeowners Property Damage ​ 71.6% ​ 21.1% ​ 4.6% ​ 0.8% ​ 0.0% ​ 0.0% ​ (0.1)% ​ 0.0% ​ 0.0% ​ 0.0% ​
Schedule of reconciliation of the disclosure of Incurred and Paid Claims Development to the Liability for Unpaid claims and Claims Adjustment Expenses	​ ​ ​ ​ Reconciliation of the Disclosure of Incurred and Paid Claims Development to the Liability for Unpaid claims and Claim Adjustment Expenses ​ ​ ​ ​ ​ December 31, 2022 Net outstanding liabilities ​ ​ Private Passenger Automobile Liability $ 176,810 Private Passenger Automobile Physical Damage ​ (2,887) Commercial Automobile Liability ​ 95,348 Commercial Automobile Physical Damage ​ 3,189 Homeowners Liability ​ 42,240 Homeowners Property Damage ​ 39,226 Other Short-Duration Insurance Lines ​ 72,813 Liabilities for unpaid claims and claim adjustment expenses, net of reinsurance $ 426,739 ​ ​ ​ Reinsurance recoverable on unpaid claims ​ ​ Private Passenger Automobile Liability $ 120 Private Passenger Automobile Physical Damage ​ - Commercial Automobile Liability ​ 86,788 Commercial Automobile Physical Damage ​ 2,836 Homeowners Liability ​ - Homeowners Property Damage ​ 3,270 Other Short-Duration Insurance Lines ​ 380 Total reinsurance recoverable on unpaid claims $ 93,394 ​ ​ ​ Unallocated claims adjustment expenses ​ 29,465 ​ ​ ​ Total gross liability for unpaid claims and claim adjustment expenses $ 549,598 ​

Income Taxes (Tables)

Income Taxes (Tables)	12 Months Ended
	Dec. 31, 2022
Income Taxes
Summary of income tax expense in the Consolidated Statements of Operations	​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Years Ended December 31, ​ ​ 2022 ​ 2021 ​ 2020 Current Income Taxes: ​ ​ ​ Federal ​ $ 21,317 ​ $ 28,222 ​ $ 31,133 State ​ 74 ​ 15 ​ 267 ​ ​ 21,391 ​ 28,237 ​ 31,400 Deferred Income Taxes: ​ ​ ​ ​ ​ ​ ​ ​ ​ Federal ​ (8,371) ​ 5,323 ​ 5,159 State ​ — ​ — ​ — ​ ​ (8,371) ​ 5,323 ​ 5,159 Total income tax expense ​ $ 13,020 ​ $ 33,560 ​ $ 36,559 ​
Schedule of sources of the difference and the tax effects	​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Years Ended December 31, ​ ​ 2022 ​ 2021 ​ 2020 Federal income tax expense at statutory rate $ 12,512 $ 34,496 $ 36,702 Investment income, net ​ (559) ​ (1,060) ​ (1,394) State taxes, net ​ 58 ​ 11 ​ 211 Nondeductible expenses ​ 468 ​ 613 ​ 697 Tax related to share-based stock compensation ​ 222 ​ (101) ​ (298) Other, net ​ 319 ​ (399) ​ 641 Total income tax expense ​ $ 13,020 ​ $ 33,560 ​ $ 36,559 ​
Schedule of deferred income tax asset (liability) representing the tax effects of temporary differences attributable to the Company's consolidated federal tax return group	​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Years Ended December 31, ​ ​ 2022 ​ 2021 Deferred tax assets: ​ ​ ​ Discounting of loss reserves ​ $ 4,790 ​ $ 5,447 ​ Discounting of unearned premium reserve ​ 17,546 ​ 16,813 ​ Net unrealized losses on investments ​ ​ 16,917 ​ ​ — ​ Bad debt allowance ​ 329 ​ 430 ​ Employee benefits ​ 4,506 ​ 4,364 ​ Rent incentive ​ 684 ​ 797 ​ Total deferred tax assets before valuation allowance ​ 44,772 ​ 27,851 ​ Valuation allowance for deferred tax assets ​ — ​ — ​ Total deferred tax assets ​ 44,772 ​ 27,851 ​ Deferred tax liabilities: ​ ​ ​ ​ ​ ​ ​ Deferred acquisition costs ​ (15,872) ​ (15,335) ​ Investments ​ (2,662) ​ (10,319) ​ Net unrealized gains on investments ​ — ​ (11,025) ​ Loss reserve transition adjustment ​ (831) ​ (1,108) ​ Software development costs ​ (2,913) ​ (3,591) ​ Premium acquisition expenses ​ (461) ​ (380) ​ Depreciation ​ (959) ​ (1,333) ​ Total deferred tax liabilities ​ (23,698) ​ (43,091) ​ Net deferred tax assets (liability) ​ $ 21,074 ​ $ (15,240) ​ ​

Fair Value of Financial Instr_2

Fair Value of Financial Instruments (Tables)	12 Months Ended
	Dec. 31, 2022
Fair Value of Financial Instruments
Fair value measurements for investments	​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ As of December 31, 2022 ​ Total Level 1 Inputs Level 2 Inputs Level 3 Inputs U.S. Treasury securities ​ $ 1,669 ​ $ — ​ $ 1,669 ​ $ — Obligations of states and political subdivisions ​ 54,069 ​ — ​ 54,069 ​ — Residential mortgage-backed securities ​ 234,502 ​ — ​ 234,502 ​ — Commercial mortgage-backed securities ​ 139,931 ​ — ​ 139,931 ​ — Other asset-backed securities ​ 68,731 ​ — ​ 68,731 ​ — Corporate and other securities ​ 551,253 ​ — ​ 551,253 ​ — Equity securities ​ 199,705 ​ 197,450 ​ — ​ 2,255 Total investment securities ​ $ 1,249,860 ​ $ 197,450 ​ $ 1,050,155 ​ $ 2,255 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ As of December 31, 2021 ​ Total Level 1 Inputs Level 2 Inputs Level 3 Inputs U.S. Treasury securities ​ $ 324 ​ $ — ​ $ 324 ​ $ — Obligations of states and political subdivisions ​ 116,302 ​ — ​ 116,302 ​ — Residential mortgage-backed securities ​ 241,464 ​ — ​ 241,464 ​ — Commercial mortgage-backed securities ​ 150,883 ​ — ​ 150,883 ​ — Other asset-backed securities ​ 83,596 ​ — ​ 83,596 ​ — Corporate and other securities ​ 625,710 ​ — ​ 625,710 ​ — Equity securities ​ 226,375 ​ 224,677 ​ — ​ 1,698 Total investment securities ​ $ 1,444,654 ​ $ 224,677 ​ $ 1,218,279 ​ $ 1,698 ​
Changes in the Company's Level 3 fair value securities	​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Years Ended December 31, ​ 2022 2021 2020 Balance at beginning of period ​ $ 1,698 ​ $ 1,698 ​ $ 516 Net gains and losses included in earnings ​ — ​ — ​ — Net gains included in other comprehensive income ​ — ​ — ​ — Purchases ​ 557 ​ — ​ 1,182 Sales ​ ​ — ​ ​ — ​ ​ — Transfers into Level 3 ​ — ​ — ​ — Transfers out of Level 3 ​ — ​ — ​ — Balance at end of period ​ $ 2,255 ​ $ 1,698 ​ $ 1,698 ​

Basis of Presentation (Details)

Basis of Presentation (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2022 USD ($)
Percentage of private passenger automobile insurance to total direct written premiums	52%
Reissuance of treasury stock	$ 5,000
Safety Northeast Insurance Agency, Inc
Incurred a contingent liability	2,407
Reissuance of treasury stock	$ 5,000
Expected to be paid	1 year

Summary of Significant Accoun_4

Summary of Significant Accounting Policies (Details) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2022 USD ($) segment $ / shares shares	Dec. 31, 2021 USD ($) $ / shares shares	Dec. 31, 2020 USD ($) $ / shares shares	Jan. 01, 2020 USD ($)
Investments
Maximum period considered for applying equity method accounting based on financial information provided by the investee	3 months
Accounts Receivable
Premiums receivable, allowance for doubtful accounts	$ 1,446	$ 1,808
Deferred Policy Acquisition Costs
Amortization expense	$ 146,013	146,573	$ 146,955
Intangible Assets
Amortization period	10 years
Intangible assets amortization expense	$ 44
Expected annual amortization expense	$ 786
Revenue Recognition
Term over which premiums are earned	1 year
Deferred revenue	$ 12,858	10,630
Advertising Costs
Advertising costs	2,399	2,232	2,311
Earnings per Weighted Average Common Share
Net income from continuing operations	46,561	130,710	138,211
Allocation for participating shares	(205)	575	636
Net income from continuing operations attributed to common shareholders	$ 46,356	$ 131,285	$ 138,847
Total weighted average common shares outstanding, including participating shares | shares	14,672,234	14,894,532	15,071,955
Less: weighted average participating shares | shares	(64,751)	(65,796)	(69,200)
Basic earnings per share denominator | shares	14,607,483	14,828,736	15,002,755
Common equivalent shares- non-vested performance stock grants | shares	103,128	96,990	116,272
Diluted earnings per share denominator | shares	14,710,611	14,925,726	15,119,027
Basic earnings per share (in dollars per share) | $ / shares	$ 3.17	$ 8.85	$ 9.25
Diluted earnings per share (in dollars per share) | $ / shares	$ 3.15	$ 8.80	$ 9.18
Antidilutive common shares | shares	0	0	0
Undistributed earnings attributable to common shareholders - basic
Net income from continuing operations attributable to common shareholders -Basic | $ / shares	$ 3.17	$ 8.85	$ 9.25
Dividends declared | $ / shares	(3.60)	(3.60)	(3.60)
Undistributed earnings | $ / shares	(0.43)	5.25	5.65
Undistributed earnings attributable to common shareholders - diluted
Net income from continuing operations attributable to common shareholders -Diluted | $ / shares	3.15	8.80	9.18
Dividends declared | $ / shares	(3.60)	(3.60)	(3.60)
Undistributed earnings | $ / shares	$ (0.45)	$ 5.20	$ 5.58
Recent Accounting Pronouncements
Retained earnings	$ 815,309	$ 821,743
Fixed maturity securities, allowance for expected credit losses	678	691		$ 2,510
Operating lease liabilities	$ 23,336	$ 27,115
Segments
Number of business segments | segment	1
Minimum
Equipment and Leasehold Improvements
Estimated useful lives	3 years
Maximum
Equipment and Leasehold Improvements
Estimated useful lives	10 years

Investments (Details)

Investments (Details) $ in Thousands	Dec. 31, 2022 USD ($) security	Dec. 31, 2021 USD ($) security	Dec. 31, 2020 USD ($)	Jan. 01, 2020 USD ($)
Marketable Securities
Fixed maturity securities, amortized cost	$ 1,152,779	$ 1,187,857
Fixed maturity securities, allowance for expected credit losses	(678)	(691)		$ (2,510)
Fixed maturity securities, Gross Unrealized Gains	1,514	36,923
Fixed maturity securities, Gross Unrealized Losses	(103,460)	(5,810)
Fixed maturity securities, Estimated Fair Value	1,050,155	1,218,279
Equity securities, Cost or Amortized Cost	231,444	211,848
Equity securities, Estimated Fair Value	240,155	264,945
Other invested assets	112,850	87,911
Cost or Amortized Cost	1,497,073	1,487,616
Gross Unrealized Gains	33,371	91,784
Gross Unrealized Losses	(126,606)	(7,574)
Estimated Fair Value	$ 1,403,160	$ 1,571,135
Number of securities in an unrealized loss position | security	1,195	444
Residential mortgage backed securities, fair value	$ 40,195
U.S. Treasury securities
Marketable Securities
Fixed maturity securities, amortized cost	1,825	$ 318
Fixed maturity securities, Gross Unrealized Gains		6
Fixed maturity securities, Gross Unrealized Losses	(156)
Fixed maturity securities, Estimated Fair Value	1,669	324
Obligations of states and political subdivisions
Marketable Securities
Fixed maturity securities, amortized cost	57,319	111,578
Fixed maturity securities, Gross Unrealized Gains	282	4,847
Fixed maturity securities, Gross Unrealized Losses	(3,532)	(123)
Fixed maturity securities, Estimated Fair Value	54,069	116,302
Residential mortgage-backed securities
Marketable Securities
Fixed maturity securities, amortized cost	259,878	237,026
Fixed maturity securities, Gross Unrealized Gains	385	5,941
Fixed maturity securities, Gross Unrealized Losses	(25,761)	(1,503)
Fixed maturity securities, Estimated Fair Value	234,502	241,464
Commercial mortgage-backed securities
Marketable Securities
Fixed maturity securities, amortized cost	156,303	146,318
Fixed maturity securities, Gross Unrealized Gains	107	5,007
Fixed maturity securities, Gross Unrealized Losses	(16,479)	(442)
Fixed maturity securities, Estimated Fair Value	139,931	150,883
Other asset-backed securities
Marketable Securities
Fixed maturity securities, amortized cost	74,160	83,376
Fixed maturity securities, Gross Unrealized Gains		475
Fixed maturity securities, Gross Unrealized Losses	(5,429)	(255)
Fixed maturity securities, Estimated Fair Value	68,731	83,596
Corporate and other securities
Marketable Securities
Fixed maturity securities, amortized cost	603,294	609,241
Fixed maturity securities, allowance for expected credit losses	(678)	(691)	$ (1,054)
Fixed maturity securities, Gross Unrealized Gains	740	20,647
Fixed maturity securities, Gross Unrealized Losses	(52,103)	(3,487)
Fixed maturity securities, Estimated Fair Value	551,253	625,710
Equity securities
Marketable Securities
Equity securities, Cost or Amortized Cost	231,444
Equity securities, Estimated Fair Value	240,155	264,945
Other invested assets		211,848
Equity securities, Gross Unrealized Gains	31,857	54,861
Equity securities, Gross Unrealized Losses	(23,146)	(1,764)
Other invested assets
Marketable Securities
Other invested assets	112,850	87,911
Other invested assets, Estimated Fair Value	$ 112,850	$ 87,911

Investments - Amortized Cost an

Investments - Amortized Cost and Estimated Fair Value (Details) - USD ($) $ in Thousands	Dec. 31, 2022	Dec. 31, 2021
Amortized Cost
Due in one year or less, Amortized Cost	$ 4,899
Due after one year through five years, Amortized Cost	289,109
Due after five years though ten years, Amortized Cost	328,816
Due after ten years through twenty years, Amortized Cost	38,044
Due after twenty years, Amortized Cost	1,570
Asset-backed securities, Amortized Cost	490,341
Totals, Amortized Cost	1,152,779	$ 1,187,857
Estimated Fair Value
Due in one year or less, Fair Value	4,665
Due after one year through five years, Fair Value	269,852
Due after five years through ten years, Fair Value	296,368
Due after ten years through twenty years, Fair Value	34,623
Due after twenty years, Fair Value	1,483
Asset-backed securities, Fair Value	443,164
Totals, Fair Value	$ 1,050,155	$ 1,218,279

Investments - Gross Realized Ga

Investments - Gross Realized Gains and Losses (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Investments
Gross realized gains fixed maturity securities	$ 1,511	$ 3,666	$ 1,645
Gross realized gains equity securities	12,367	12,275	6,864
Gross realized losses fixed maturities	(2,987)	(1,036)	(2,166)
Gross realized losses equity securities	(1,701)	(20)	(5,386)
Net realized gains on investments	$ 9,190	$ 14,885	$ 957

Investments - Gross Unrealized

Investments - Gross Unrealized Losses and Fair Value (Details) - USD ($) $ in Thousands	Dec. 31, 2022	Dec. 31, 2021
Marketable Securities
Estimated Fair Value, Less than 12 Months	$ 831,170	$ 369,954
Estimated Fair Value, 12 Months or More	263,554	13,488
Estimated Fair Value, Total	1,094,724	383,442
Unrealized Losses, Less than 12 Months	78,150	6,983
Unrealized Losses, 12 Months or More	48,456	591
Unrealized Losses, Total	126,606	7,574
Subtotal, fixed maturity securities
Fixed Maturity Securities
Estimated Fair Value, Less than 12 Months	714,289	350,497
Estimated Fair Value, 12 Months or More	257,345	12,459
Estimated Fair Value, Total	971,634	362,956
Unrealized Losses, Less than 12 Months	56,952	5,424
Unrealized Losses, 12 Months or More	46,508	386
Unrealized Losses, Total	103,460	5,810
U.S. Treasury securities
Fixed Maturity Securities
Estimated Fair Value, Less than 12 Months	1,669
Estimated Fair Value, Total	1,669
Unrealized Losses, Less than 12 Months	156
Unrealized Losses, Total	156
Obligations of states and political subdivisions
Fixed Maturity Securities
Estimated Fair Value, Less than 12 Months	34,178	2,985
Estimated Fair Value, 12 Months or More	3,072	1,012
Estimated Fair Value, Total	37,250	3,997
Unrealized Losses, Less than 12 Months	2,504	85
Unrealized Losses, 12 Months or More	1,028	38
Unrealized Losses, Total	3,532	123
Residential mortgage-backed securities
Fixed Maturity Securities
Estimated Fair Value, Less than 12 Months	140,855	97,116
Estimated Fair Value, 12 Months or More	70,956	11
Estimated Fair Value, Total	211,811	97,127
Unrealized Losses, Less than 12 Months	12,254	1,502
Unrealized Losses, 12 Months or More	13,507	1
Unrealized Losses, Total	25,761	1,503
Commercial mortgage-backed securities
Fixed Maturity Securities
Estimated Fair Value, Less than 12 Months	110,073	29,660
Estimated Fair Value, 12 Months or More	24,653
Estimated Fair Value, Total	134,726	29,660
Unrealized Losses, Less than 12 Months	11,632	442
Unrealized Losses, 12 Months or More	4,847
Unrealized Losses, Total	16,479	442
Other asset-backed securities
Fixed Maturity Securities
Estimated Fair Value, Less than 12 Months	41,113	39,266
Estimated Fair Value, 12 Months or More	27,618
Estimated Fair Value, Total	68,731	39,266
Unrealized Losses, Less than 12 Months	2,358	255
Unrealized Losses, 12 Months or More	3,071
Unrealized Losses, Total	5,429	255
Corporate and other securities
Fixed Maturity Securities
Estimated Fair Value, Less than 12 Months	386,401	181,470
Estimated Fair Value, 12 Months or More	131,046	11,436
Estimated Fair Value, Total	517,447	192,906
Unrealized Losses, Less than 12 Months	28,048	3,140
Unrealized Losses, 12 Months or More	24,055	347
Unrealized Losses, Total	52,103	3,487
Equity securities
Equity Securities
Estimated Fair Value, Less than 12 Months	116,881	19,457
Estimated Fair Value, 12 Months or More	6,209	1,029
Estimated Fair Value, Total	123,090	20,486
Unrealized Losses, Less than 12 Months	21,198	1,559
Unrealized Losses, 12 Months or More	1,948	205
Unrealized Losses, Total	$ 23,146	$ 1,764

Investments - Allowance for Exp

Investments - Allowance for Expected Credit Losses (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021
Marketable Securities
Beginning of period	$ 691
Ending balance of period	678	$ 691
Corporate and other securities
Marketable Securities
Beginning of period	691	1,054
Credit losses on securities with no previously recorded credit losses	193	9
Net increases (decreases) in allowance on previously impaired securities	98	(137)
Reduction due to sales	(304)	(235)
Ending balance of period	$ 678	$ 691

Investments - Components of Net

Investments - Components of Net Investment Income (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Components of net investment income
Interest on fixed maturity securities	$ 40,886	$ 36,160	$ 37,727
Dividends on equity securities	6,746	6,421	5,044
Equity in earnings of other invested assets	2,304	4,895	1,378
Interest on other assets	61	22	27
Total Investment Income	49,997	47,498	44,176
Investment expenses	3,272	3,363	3,131
Net investment income	$ 46,725	$ 44,135	$ 41,045

Investments - Other (Details)

Investments - Other (Details) - USD ($) $ in Thousands	Dec. 31, 2022	Dec. 31, 2021
Marketable Securities [Line Items]
Securities held	$ 1,050,155	$ 1,218,279
Subprime mortgage debt securities
Marketable Securities [Line Items]
Securities held	$ 0

Investments - Fair Value Measur

Investments - Fair Value Measurements (Details) - USD ($) $ in Thousands	Dec. 31, 2022	Dec. 31, 2021
Fair value of financial instruments
Fixed maturity securities, Estimated Fair Value	$ 1,050,155	$ 1,218,279
Short term investments, Estimated Fair Value	0	0
Equity securities, Estimated Fair Value	240,155	264,945
Marketable Securities, Total	1,050,155	1,218,279
Level 1 Inputs
Fair value of financial instruments
Marketable Securities, Total	197,450	224,677
Level 1 Inputs | Equity securities
Fair value of financial instruments
Equity securities, Estimated Fair Value	197,450	224,677
Level 2 Inputs
Fair value of financial instruments
Marketable Securities, Total	1,050,155	1,218,279
Level 2 Inputs | U.S. Treasury securities
Fair value of financial instruments
Fixed maturity securities, Estimated Fair Value	1,669	324
Level 2 Inputs | Obligations of states and political subdivisions
Fair value of financial instruments
Fixed maturity securities, Estimated Fair Value	54,069	116,302
Level 2 Inputs | Residential mortgage-backed securities
Fair value of financial instruments
Fixed maturity securities, Estimated Fair Value	234,502	241,464
Level 2 Inputs | Commercial mortgage-backed securities
Fair value of financial instruments
Fixed maturity securities, Estimated Fair Value	139,931	150,883
Level 2 Inputs | Other asset-backed securities
Fair value of financial instruments
Fixed maturity securities, Estimated Fair Value	68,731	83,596
Level 2 Inputs | Corporate and other securities
Fair value of financial instruments
Fixed maturity securities, Estimated Fair Value	551,253	625,710
Level 3 Inputs
Fair value of financial instruments
Marketable Securities, Total	2,255	1,698
Level 3 Inputs | Equity securities
Fair value of financial instruments
Equity securities, Estimated Fair Value	2,255	1,698
Estimated Fair Value
Fair value of financial instruments
Marketable Securities, Total	1,249,860	1,444,654
Estimated Fair Value | U.S. Treasury securities
Fair value of financial instruments
Fixed maturity securities, Estimated Fair Value	1,669	324
Estimated Fair Value | Obligations of states and political subdivisions
Fair value of financial instruments
Fixed maturity securities, Estimated Fair Value	54,069	116,302
Estimated Fair Value | Residential mortgage-backed securities
Fair value of financial instruments
Fixed maturity securities, Estimated Fair Value	234,502	241,464
Estimated Fair Value | Commercial mortgage-backed securities
Fair value of financial instruments
Fixed maturity securities, Estimated Fair Value	139,931	150,883
Estimated Fair Value | Other asset-backed securities
Fair value of financial instruments
Fixed maturity securities, Estimated Fair Value	68,731	83,596
Estimated Fair Value | Corporate and other securities
Fair value of financial instruments
Fixed maturity securities, Estimated Fair Value	551,253	625,710
Estimated Fair Value | Equity securities
Fair value of financial instruments
Equity securities, Estimated Fair Value	$ 199,705	$ 226,375

Investments - Level 3 (Details)

Investments - Level 3 (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Changes in the Company's Level 3 fair value securities
Balance at beginning of period	$ 1,698	$ 1,698	$ 516
Purchases	557		1,182
Transfers into Level 3	0	0	0
Transfers out of Level 3	0	0	0
Balance at end of period	$ 2,255	$ 1,698	$ 1,698

Allowance for Expected Credit_3

Allowance for Expected Credit Losses - Balances of Premiums Receivable (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021
Accounts Receivable, after Allowance for Credit Loss [Abstract]
Balance, beginning of period	$ 170,953	$ 179,147
Balance, end of period	192,542	170,953
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Balance, beginning of period	1,808	1,754
Current period change for expected credit losses	1,339	2,339
Writeoffs of uncollectable accounts receivable	(1,701)	(2,285)
Balance, end of period	$ 1,446	$ 1,808

Allowance for Expected Credit_4

Allowance for Expected Credit Losses (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]
Expected credit losses	$ 0	$ 0
CAR Commercial Automobile Program and the Taxi/Limo Program
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]
Percentage of reinsurance recoverable	94%	94%
Other Contracts
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]
Percentage of reinsurance recoverable	6%	6%

Equipment and Leasehold Impro_3

Equipment and Leasehold Improvements (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Property, plant and equipment
Total cost	$ 89,470	$ 88,630
Less accumulated depreciation and amortization	71,342	65,188
Equipment and leasehold improvements, net	18,128	23,442
Depreciation and amortization	7,876	6,896	$ 7,526
Software
Property, plant and equipment
Total cost	58,079	57,463
Computer equipment
Property, plant and equipment
Total cost	15,649	15,425
Leasehold improvements
Property, plant and equipment
Total cost	8,264	8,264
Other equipment
Property, plant and equipment
Total cost	3,132	3,132
Furniture and fixtures
Property, plant and equipment
Total cost	$ 4,346	$ 4,346

Employee Benefit Plan (Details)

Employee Benefit Plan (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Employee Benefit Plan
Minimum age required to be eligible for contribution under the Retirement Plan	21 years
Employer matching contribution (as a percent)	100%
Maximum amount contributed by employee from employees base salary (as a percent)	8%
Compensation expense	$ 3,382	$ 3,433	$ 3,388

Share-Based Compensation (Detai

Share-Based Compensation (Details) - shares	Dec. 31, 2022	Mar. 24, 2022	Apr. 02, 2018
Maximum number of shares of common stock with respect to which awards may be granted	3,200,000
Number of shares available for future grant	444,216
The Incentive Plan
Number of shares available for future grant	0
The 2018 Plan
Maximum number of shares of common stock with respect to which awards may be granted		350,000
The Amended 2018 Plan
Maximum number of shares of common stock with respect to which awards may be granted			700,000

Share-Based Compensation - Rest

Share-Based Compensation - Restricted Stock Activity (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Weighted Average Fair Value
Unrecognized compensation expense related to non-vested restricted stock awards	$ 5,370
Weighted average period expected for recognition of compensation expense related to non-vested restricted stock awards	1 year 4 months 24 days
Total fair value of the shares that were vested and unrestricted during the period	$ 5,749	$ 6,947	$ 6,516
Compensation expense, net of tax	4,724	4,971	5,893
Income tax benefits from compensation expense	$ 1,256	$ 1,321	$ 1,566
Performance-based Shares Under Restriction
Shares Under Restriction
Outstanding at beginning of year (in shares)	72,418	71,964	84,105
Granted (in shares)	31,828	49,460	36,649
Vested and unrestricted (in shares)	(26,504)	(48,666)	(42,123)
Forfeited (in shares)	(2,673)	(340)	(6,667)
Outstanding at end of period (in shares)	75,069	72,418	71,964
Weighted Average Fair Value
Outstanding at beginning of year (in dollars per share)	$ 86.53	$ 84.94	$ 79.34
Granted (in dollars per share)	86.35	77.56	84.68
Vested and unrestricted (in dollars per share)	92.52	75.05	73.55
Forfeited (in dollars per share)	83.01	87.43	84.86
Outstanding at end of period (in dollars per share)	$ 84.46	$ 86.53	$ 84.94
Performance-based Shares Under Restriction | Minimum
Share-Based Compensation
Actual Payouts (as a percent)	0%
Performance-based Shares Under Restriction | Maximum
Share-Based Compensation
Actual Payouts (as a percent)	200%
Restricted Stock
Share-Based Compensation
Vesting period	3 years
Shares Under Restriction
Outstanding at beginning of year (in shares)	65,171	66,550	78,202
Granted (in shares)	38,864	39,840	34,799
Vested and unrestricted (in shares)	(38,328)	(40,763)	(43,757)
Forfeited (in shares)	(2,294)	(456)	(2,694)
Outstanding at end of period (in shares)	63,413	65,171	66,550
Weighted Average Fair Value
Outstanding at beginning of year (in dollars per share)	$ 84.30	$ 85.16	$ 79.09
Granted (in dollars per share)	85.22	79.27	90.10
Vested and unrestricted (in dollars per share)	86.02	80.82	78.10
Forfeited (in dollars per share)	83.10	81.17	87.70
Outstanding at end of period (in dollars per share)	$ 83.87	$ 84.30	$ 85.16
Restricted Stock | Executives and non-executives (2018 and after)
Share-Based Compensation
Vesting period	5 years
Restricted Stock | First anniversary of grant date | Executives and non-executives (2018 and after)
Share-Based Compensation
Vesting percentage (as a percent)	30%
Restricted Stock | Second anniversary of grant date
Share-Based Compensation
Vesting percentage (as a percent)	30%
Restricted Stock | Third anniversary of grant date | Executives and non-executives (2018 and after)
Share-Based Compensation
Vesting percentage (as a percent)	40%

Commitments and Contingencies (

Commitments and Contingencies (Details) - USD ($) $ in Thousands	Dec. 31, 2022	Dec. 31, 2021
Commitments and Contingencies
Legal defense accrual		$ 6,500
Legal defense accrual reversal	$ 6,500
Limited partnership commitments
Commitments and Contingencies
Investment in limited partnership, committed amount	160,000
Contribution made	114,418
Contributions to be made	$ 52,000

Leases (Details)

Leases (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Leases
Operating lease, existence of option to extend	true
Rental expense	$ 3,948	$ 3,852	$ 3,477
Minimum
Leases
Operating lease, remaining lease term	1 year
Maximum
Leases
Operating lease, remaining lease term	8 years
Operating lease, renewal term	5 years

Leases - Components of lease (D

Leases - Components of lease (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Leases
Operating lease cost	$ 4,214	$ 4,464	$ 4,591
Operating cash flows from operating leases	$ 4,757	$ 4,979	$ 5,073
Weighted average remaining lease term Operating leases	5 years 9 months	6 years 7 months 24 days	7 years 6 months 25 days
Weighted average discount rate Operating leases	2.39%	2.34%	2.33%

Leases - Maturities (Details)

Leases - Maturities (Details) - USD ($) $ in Thousands	Dec. 31, 2022	Dec. 31, 2021
Leases
2023	$ 4,521
2024	4,269
2025	3,867
2026	3,857
2027	3,857
Thereafter	3,860
Total lease payments	24,231
Less imputed interest	(895)
Total	$ 23,336	$ 27,115

Debt (Details)

Debt (Details) - USD ($) $ in Thousands		12 Months Ended
	Dec. 29, 2022	Dec. 31, 2022	Dec. 31, 2021	Mar. 17, 2020
Debt
Outstanding amount		$ 35,000	$ 30,000
Advance term		5 years
Interest Expense, Borrowings		$ 524	522
Residential mortgage-backed securities
Debt
Fair value of loan		$ 40,195	40,398
Interest-bearing FHLB
Debt
Interest rate percentage	4.34%	1.42%
Revolving Credit Agreement
Debt
Current borrowing capacity		$ 30,000
Revolving Credit Agreement | LIBOR rate
Debt
Variable interest rate basis		LIBOR
Spread on variable rate (as a percent)		1.25%
Revolving Credit Agreement | Prime rate
Debt
Variable interest rate basis		prime rate
Revolving Credit Agreement | Federal Funds Effective Swap Rate
Debt
Variable interest rate basis		federal funds rate
Spread on variable rate (as a percent)		1.25%
RBS Citizens | Revolving Credit Agreement
Debt
Current borrowing capacity		$ 30,000	30,000
Maximum borrowing capacity		50,000
Default trigger, principal amount		10,000
Outstanding amount		$ 0	$ 0
Commitment fee (as a percent)		0.25%	0.25%
RBS Citizens | Revolving Credit Agreement | Prime rate
Debt
Additional spread on variable rate (as a percent)		0.50%
F H L B Boston
Debt
Outstanding amount	$ 5,000			$ 30
Maximum borrowing capacity using eligible invested assets as collateral		$ 201,396
Advance term	1 month
Level 2 Inputs | F H L B Boston
Debt
Fair value of loan		$ 35,807	$ 31,061

Reinsurance (Details)

Reinsurance (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Reinsurance
Prepaid Reinsurance Premiums	$ 28,453	$ 23,795
CAR | Reinsurance Recoverable Including Reinsurance Premium Paid [Member] | Concentration of credit risk
Reinsurance
Reinsurance receivables on paid and unpaid loss and LAE	99,688	106,608
Assumed net losses	3,326	5,002	$ 3,480
Prepaid Reinsurance Premiums	$ 26,377	$ 21,841

Reinsurance - Written and Earne

Reinsurance - Written and Earned Premiums (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Written Premiums
Direct	$ 823,318	$ 802,139	$ 798,712
Assumed	28,835	31,359	26,316
Ceded	(78,418)	(68,972)	(61,491)
Net written premiums	773,735	764,526	763,537
Earned Premiums
Direct	803,289	811,329	815,981
Assumed	28,976	30,583	29,365
Ceded	(73,760)	(67,584)	(74,268)
Net earned premiums	758,505	774,328	771,078
Loss and LAE
Direct	515,535	473,162	428,018
Assumed	18,627	16,873	18,595
Ceded	(42,183)	(28,308)	(42,057)
Net loss and LAE	$ 491,979	$ 461,727	$ 404,556

Loss and Loss Adjustment Expe_3

Loss and Loss Adjustment Expense Reserves (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Reserves for losses and LAE at beginning of year	$ 570,651	$ 567,581	$ 610,566
Less receivable from reinsurers related to unpaid losses and LAE	(90,667)	(106,311)	(122,372)
Net reserves for losses and LAE at beginning of year	479,984	461,270	488,194
Incurred losses and LAE, related to:
Current year	549,258	515,400	459,400
Prior years	(57,279)	(53,673)	(54,844)
Total incurred losses and LAE	491,979	461,727	404,556
Paid losses and LAE related to:
Current year	342,971	310,116	277,754
Prior years	172,788	132,897	153,726
Total paid losses and LAE	515,759	443,013	431,480
Net reserves for losses and LAE at end of period	456,204	479,984	461,270
Plus receivable from reinsurers related to unpaid losses and LAE	93,394	90,667	106,311
Reserves for losses and LAE at end of period	549,598	570,651	567,581
Prior years	(57,279)	(53,673)	(54,844)
Reduction in retained homeowners reserves	20,241	26,220	21,717
Reduction in retained automobile reserves	32,963	$ 22,313	$ 26,902
Private Passenger Automobile Liability
Paid losses and LAE related to:
Plus receivable from reinsurers related to unpaid losses and LAE	120
Private Passenger Automobile Physical Damage
Paid losses and LAE related to:
Plus receivable from reinsurers related to unpaid losses and LAE	0
Commercial Automobile Liability
Paid losses and LAE related to:
Plus receivable from reinsurers related to unpaid losses and LAE	86,788
Commercial Automobile Physical Damage
Paid losses and LAE related to:
Plus receivable from reinsurers related to unpaid losses and LAE	2,836
Homeowners Property Damage
Paid losses and LAE related to:
Plus receivable from reinsurers related to unpaid losses and LAE	3,270
Other short-Duration Insurance Lines
Paid losses and LAE related to:
Plus receivable from reinsurers related to unpaid losses and LAE	$ 380

Loss and Loss Adjustment Expe_4

Loss and Loss Adjustment Expense Reserves - Incurred and paid claims development (Details)	Dec. 31, 2022 USD ($) claim	Dec. 31, 2021 USD ($)	Dec. 31, 2020 USD ($)	Dec. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)	Dec. 31, 2016 USD ($)	Dec. 31, 2015 USD ($)	Dec. 31, 2014 USD ($)	Dec. 31, 2013 USD ($)
incurred and paid claims development
Liabilities for claims and claims adjustment expenses, net of reinsurance	$ 426,739,000
Private Passenger Automobile Liability
incurred and paid claims development
Incurred claims and allocated claim adjustment expenses, net of reinsurance	1,645,211,000
Cumulative paid and allocated claim adjustment expenses, net of reinsurance	1,468,747,000
All outstanding liabilities before 2012, net of reinsurance	346,000		$ 346,000
Liabilities for claims and claims adjustment expenses, net of reinsurance	176,810,000
Private Passenger Automobile Physical Damage
incurred and paid claims development
Incurred claims and allocated claim adjustment expenses, net of reinsurance	1,226,174,000
Cumulative paid and allocated claim adjustment expenses, net of reinsurance	1,229,061,000
Liabilities for claims and claim adjustment expenses, net of reinsurance	(2,887,000)
Commercial Automobile Liability
incurred and paid claims development
Incurred claims and allocated claim adjustment expenses, net of reinsurance	370,854,000
Cumulative paid and allocated claim adjustment expenses, net of reinsurance	275,506,000
Liabilities for claims and claims adjustment expenses, net of reinsurance	95,348,000
Commercial Automobile Physical Damage
incurred and paid claims development
Incurred claims and allocated claim adjustment expenses, net of reinsurance	186,919,000
Cumulative paid and allocated claim adjustment expenses, net of reinsurance	183,730,000
Liabilities for claims and claims adjustment expenses, net of reinsurance	3,189,000
Homeowners Liability
incurred and paid claims development
Incurred claims and allocated claim adjustment expenses, net of reinsurance	92,006,000
Cumulative paid and allocated claim adjustment expenses, net of reinsurance	49,766,000
Liabilities for claims and claims adjustment expenses, net of reinsurance	42,240,000
Homeowners Property Damage
incurred and paid claims development
Incurred claims and allocated claim adjustment expenses, net of reinsurance	753,274,000
Cumulative paid and allocated claim adjustment expenses, net of reinsurance	715,078,000
All outstanding liabilities before 2012, net of reinsurance	1,030,000	$ 1,030,000
Liabilities for claims and claims adjustment expenses, net of reinsurance	39,226,000
2013 | Private Passenger Automobile Liability
incurred and paid claims development
Incurred claims and allocated claim adjustment expenses, net of reinsurance	175,374,000	175,362,000	175,718,000	$ 175,684,000	$ 176,713,000	$ 179,167,000	$ 181,492,000	$ 183,264,000	$ 183,517,000	$ 183,367,000
Total of Incurred-but-Not-Reported Liabilities Plus Expected Development of Reported Claims	$ (84,000)
Cumulative Number of Reported claims | claim	54,248
Cumulative paid and allocated claim adjustment expenses, net of reinsurance	$ 174,858,000	174,639,000	174,574,000	173,890,000	172,736,000	169,634,000	163,694,000	152,472,000	135,031,000	79,049,000
2013 | Private Passenger Automobile Physical Damage
incurred and paid claims development
Incurred claims and allocated claim adjustment expenses, net of reinsurance	$ 111,970,000	111,989,000	112,003,000	112,029,000	112,060,000	112,096,000	112,197,000	113,034,000	114,239,000	114,389,000
Cumulative Number of Reported claims | claim	131,703
Cumulative paid and allocated claim adjustment expenses, net of reinsurance	$ 111,970,000	111,988,000	112,003,000	112,029,000	112,060,000	112,085,000	112,162,000	112,894,000	115,904,000	120,843,000
2013 | Commercial Automobile Liability
incurred and paid claims development
Incurred claims and allocated claim adjustment expenses, net of reinsurance	25,052,000	25,140,000	25,353,000	25,443,000	25,986,000	26,310,000	26,864,000	28,377,000	29,541,000	29,175,000
Total of Incurred-but-Not-Reported Liabilities Plus Expected Development of Reported Claims	$ 1,000
Cumulative Number of Reported claims	5,784
Cumulative paid and allocated claim adjustment expenses, net of reinsurance	$ 24,799,000	24,789,000	24,732,000	24,507,000	23,867,000	22,434,000	21,129,000	19,625,000	17,079,000	8,502,000
2013 | Commercial Automobile Physical Damage
incurred and paid claims development
Incurred claims and allocated claim adjustment expenses, net of reinsurance	$ 13,055,000	13,057,000	13,057,000	13,071,000	13,047,000	13,057,000	13,180,000	13,298,000	13,567,000	13,666,000
Cumulative Number of Reported claims | claim	12,298
Cumulative paid and allocated claim adjustment expenses, net of reinsurance	$ 13,055,000	13,057,000	13,057,000	13,066,000	13,060,000	13,065,000	13,074,000	13,114,000	13,378,000	12,665,000
2013 | Homeowners Liability
incurred and paid claims development
Incurred claims and allocated claim adjustment expenses, net of reinsurance	$ 5,096,000	5,167,000	5,147,000	5,147,000	5,312,000	5,978,000	7,578,000	9,337,000	9,768,000	9,768,000
Cumulative Number of Reported claims | claim	265
Cumulative paid and allocated claim adjustment expenses, net of reinsurance	$ 4,267,000	4,255,000	4,247,000	4,209,000	4,038,000	3,829,000	3,493,000	3,080,000	2,337,000	527,000
2013 | Homeowners Property Damage
incurred and paid claims development
Incurred claims and allocated claim adjustment expenses, net of reinsurance	49,453,000	49,455,000	49,456,000	49,463,000	49,973,000	51,077,000	52,464,000	55,722,000	56,199,000	56,298,000
Total of Incurred-but-Not-Reported Liabilities Plus Expected Development of Reported Claims	$ 126,000
Cumulative Number of Reported claims | claim	5,698
Cumulative paid and allocated claim adjustment expenses, net of reinsurance	$ 49,328,000	49,327,000	49,327,000	49,328,000	49,620,000	49,653,000	49,612,000	49,702,000	48,456,000	$ 38,661,000
2014 | Private Passenger Automobile Liability
incurred and paid claims development
Incurred claims and allocated claim adjustment expenses, net of reinsurance	179,264,000	179,268,000	179,267,000	179,251,000	181,312,000	183,119,000	186,798,000	187,104,000	187,305,000
Total of Incurred-but-Not-Reported Liabilities Plus Expected Development of Reported Claims	$ (336,000)
Cumulative Number of Reported claims | claim	52,787
Cumulative paid and allocated claim adjustment expenses, net of reinsurance	$ 178,324,000	177,968,000	177,360,000	176,616,000	173,163,000	166,815,000	156,693,000	136,434,000	79,151,000
2014 | Private Passenger Automobile Physical Damage
incurred and paid claims development
Incurred claims and allocated claim adjustment expenses, net of reinsurance	$ 122,163,000	122,182,000	122,188,000	122,213,000	122,341,000	122,327,000	122,410,000	123,622,000	123,421,000
Cumulative Number of Reported claims | claim	135,006
Cumulative paid and allocated claim adjustment expenses, net of reinsurance	$ 122,163,000	122,189,000	122,216,000	122,251,000	122,350,000	122,402,000	122,668,000	126,414,000	130,732,000
2014 | Commercial Automobile Liability
incurred and paid claims development
Incurred claims and allocated claim adjustment expenses, net of reinsurance	32,313,000	32,052,000	32,200,000	32,438,000	32,948,000	33,914,000	34,376,000	34,105,000	34,117,000
Total of Incurred-but-Not-Reported Liabilities Plus Expected Development of Reported Claims	$ 2,000
Cumulative Number of Reported claims	6,086
Cumulative paid and allocated claim adjustment expenses, net of reinsurance	$ 32,085,000	31,451,000	31,298,000	30,420,000	27,886,000	25,253,000	21,968,000	17,853,000	9,426,000
2014 | Commercial Automobile Physical Damage
incurred and paid claims development
Incurred claims and allocated claim adjustment expenses, net of reinsurance	$ 15,376,000	15,376,000	15,373,000	15,381,000	15,353,000	15,419,000	15,455,000	16,925,000	17,426,000
Cumulative Number of Reported claims | claim	13,545
Cumulative paid and allocated claim adjustment expenses, net of reinsurance	$ 15,376,000	15,376,000	15,373,000	15,376,000	15,381,000	15,388,000	15,424,000	15,862,000	15,377,000
2014 | Homeowners Liability
incurred and paid claims development
Incurred claims and allocated claim adjustment expenses, net of reinsurance	$ 6,620,000	6,818,000	6,984,000	6,984,000	7,120,000	7,388,000	9,738,000	11,494,000	11,494,000
Cumulative Number of Reported claims | claim	261
Cumulative paid and allocated claim adjustment expenses, net of reinsurance	$ 6,419,000	6,419,000	6,368,000	6,315,000	4,828,000	4,200,000	3,212,000	1,834,000	340,000
2014 | Homeowners Property Damage
incurred and paid claims development
Incurred claims and allocated claim adjustment expenses, net of reinsurance	54,556,000	54,560,000	54,602,000	54,607,000	55,127,000	57,331,000	59,751,000	60,213,000	59,160,000
Total of Incurred-but-Not-Reported Liabilities Plus Expected Development of Reported Claims	$ 251,000
Cumulative Number of Reported claims | claim	6,077
Cumulative paid and allocated claim adjustment expenses, net of reinsurance	$ 54,306,000	54,305,000	54,306,000	54,274,000	54,262,000	54,224,000	54,088,000	52,161,000	$ 40,409,000
2015 | Private Passenger Automobile Liability
incurred and paid claims development
Incurred claims and allocated claim adjustment expenses, net of reinsurance	178,951,000	179,248,000	179,451,000	181,299,000	184,477,000	188,317,000	190,236,000	190,036,000
Total of Incurred-but-Not-Reported Liabilities Plus Expected Development of Reported Claims	$ (204,000)
Cumulative Number of Reported claims | claim	52,980
Cumulative paid and allocated claim adjustment expenses, net of reinsurance	$ 178,357,000	177,782,000	176,652,000	173,816,000	168,641,000	156,483,000	138,255,000	76,934,000
2015 | Private Passenger Automobile Physical Damage
incurred and paid claims development
Incurred claims and allocated claim adjustment expenses, net of reinsurance	133,552,000	133,523,000	133,530,000	133,581,000	133,737,000	134,101,000	136,661,000	140,219,000
Total of Incurred-but-Not-Reported Liabilities Plus Expected Development of Reported Claims	$ (3,000)
Cumulative Number of Reported claims | claim	144,276
Cumulative paid and allocated claim adjustment expenses, net of reinsurance	$ 133,555,000	133,575,000	133,596,000	133,639,000	133,701,000	134,066,000	136,760,000	143,532,000
2015 | Commercial Automobile Liability
incurred and paid claims development
Incurred claims and allocated claim adjustment expenses, net of reinsurance	37,630,000	37,995,000	38,257,000	38,015,000	37,730,000	36,610,000	36,150,000	35,371,000
Total of Incurred-but-Not-Reported Liabilities Plus Expected Development of Reported Claims	$ (62,000)
Cumulative Number of Reported claims	7,212
Cumulative paid and allocated claim adjustment expenses, net of reinsurance	$ 35,302,000	34,976,000	33,416,000	31,537,000	29,804,000	26,018,000	21,700,000	11,181,000
2015 | Commercial Automobile Physical Damage
incurred and paid claims development
Incurred claims and allocated claim adjustment expenses, net of reinsurance	$ 18,523,000	18,525,000	18,535,000	18,641,000	18,974,000	19,021,000	19,047,000	20,223,000
Cumulative Number of Reported claims | claim	15,468
Cumulative paid and allocated claim adjustment expenses, net of reinsurance	$ 18,523,000	18,525,000	18,530,000	18,541,000	18,549,000	18,667,000	18,910,000	17,787,000
2015 | Homeowners Liability
incurred and paid claims development
Incurred claims and allocated claim adjustment expenses, net of reinsurance	7,582,000	8,172,000	9,201,000	9,201,000	9,201,000	9,908,000	12,555,000	12,965,000
Total of Incurred-but-Not-Reported Liabilities Plus Expected Development of Reported Claims	$ 117,000
Cumulative Number of Reported claims | claim	288
Cumulative paid and allocated claim adjustment expenses, net of reinsurance	$ 7,302,000	7,215,000	7,022,000	6,445,000	5,205,000	4,267,000	3,319,000	428,000
2015 | Homeowners Property Damage
incurred and paid claims development
Incurred claims and allocated claim adjustment expenses, net of reinsurance	162,244,000	162,244,000	162,354,000	162,722,000	162,788,000	162,377,000	152,049,000	152,586,000
Total of Incurred-but-Not-Reported Liabilities Plus Expected Development of Reported Claims	$ 462,000
Cumulative Number of Reported claims | claim	20,076
Cumulative paid and allocated claim adjustment expenses, net of reinsurance	$ 161,781,000	161,783,000	161,850,000	161,773,000	161,745,000	160,572,000	145,337,000	$ 112,563,000
2016 | Private Passenger Automobile Liability
incurred and paid claims development
Incurred claims and allocated claim adjustment expenses, net of reinsurance	176,700,000	176,600,000	177,009,000	180,486,000	185,009,000	192,318,000	192,912,000
Total of Incurred-but-Not-Reported Liabilities Plus Expected Development of Reported Claims	$ (392,000)
Cumulative Number of Reported claims | claim	49,386
Cumulative paid and allocated claim adjustment expenses, net of reinsurance	$ 175,803,000	174,410,000	171,865,000	167,458,000	154,964,000	137,917,000	78,862,000
2016 | Private Passenger Automobile Physical Damage
incurred and paid claims development
Incurred claims and allocated claim adjustment expenses, net of reinsurance	121,615,000	121,570,000	121,543,000	121,717,000	122,116,000	124,922,000	129,528,000
Total of Incurred-but-Not-Reported Liabilities Plus Expected Development of Reported Claims	$ (5,000)
Cumulative Number of Reported claims | claim	126,091
Cumulative paid and allocated claim adjustment expenses, net of reinsurance	$ 121,618,000	121,634,000	121,660,000	121,795,000	122,023,000	124,298,000	133,530,000
2016 | Commercial Automobile Liability
incurred and paid claims development
Incurred claims and allocated claim adjustment expenses, net of reinsurance	40,767,000	40,996,000	40,679,000	40,916,000	40,947,000	39,416,000	37,954,000
Total of Incurred-but-Not-Reported Liabilities Plus Expected Development of Reported Claims	$ 56,000
Cumulative Number of Reported claims	6,457
Cumulative paid and allocated claim adjustment expenses, net of reinsurance	$ 39,233,000	38,275,000	36,237,000	32,274,000	25,711,000	19,902,000	9,991,000
2016 | Commercial Automobile Physical Damage
incurred and paid claims development
Incurred claims and allocated claim adjustment expenses, net of reinsurance	17,721,000	17,713,000	17,725,000	17,808,000	17,909,000	18,506,000	20,216,000
Total of Incurred-but-Not-Reported Liabilities Plus Expected Development of Reported Claims	$ 1,000
Cumulative Number of Reported claims | claim	13,593
Cumulative paid and allocated claim adjustment expenses, net of reinsurance	$ 17,721,000	17,712,000	17,709,000	17,712,000	17,763,000	18,143,000	17,228,000
2016 | Homeowners Liability
incurred and paid claims development
Incurred claims and allocated claim adjustment expenses, net of reinsurance	8,873,000	9,491,000	9,491,000	9,847,000	10,594,000	10,594,000	10,594,000
Total of Incurred-but-Not-Reported Liabilities Plus Expected Development of Reported Claims	$ 151,000
Cumulative Number of Reported claims | claim	277
Cumulative paid and allocated claim adjustment expenses, net of reinsurance	$ 7,628,000	7,128,000	6,300,000	5,387,000	4,257,000	2,669,000	647,000
2016 | Homeowners Property Damage
incurred and paid claims development
Incurred claims and allocated claim adjustment expenses, net of reinsurance	59,857,000	59,898,000	60,019,000	61,262,000	64,208,000	66,442,000	67,116,000
Total of Incurred-but-Not-Reported Liabilities Plus Expected Development of Reported Claims	$ 312,000
Cumulative Number of Reported claims | claim	5,421
Cumulative paid and allocated claim adjustment expenses, net of reinsurance	$ 59,493,000	59,428,000	59,403,000	59,449,000	59,155,000	57,238,000	$ 44,103,000
2017 | Private Passenger Automobile Liability
incurred and paid claims development
Incurred claims and allocated claim adjustment expenses, net of reinsurance	176,564,000	177,320,000	177,941,000	182,068,000	184,429,000	185,673,000
Total of Incurred-but-Not-Reported Liabilities Plus Expected Development of Reported Claims	$ (1,723,000)
Cumulative Number of Reported claims | claim	46,257
Cumulative paid and allocated claim adjustment expenses, net of reinsurance	$ 172,362,000	169,024,000	164,467,000	153,675,000	133,037,000	77,519,000
2017 | Private Passenger Automobile Physical Damage
incurred and paid claims development
Incurred claims and allocated claim adjustment expenses, net of reinsurance	123,779,000	123,777,000	123,715,000	124,128,000	126,304,000	128,340,000
Total of Incurred-but-Not-Reported Liabilities Plus Expected Development of Reported Claims	$ (35,000)
Cumulative Number of Reported claims | claim	124,026
Cumulative paid and allocated claim adjustment expenses, net of reinsurance	$ 123,795,000	123,839,000	123,844,000	124,286,000	126,822,000	132,409,000
2017 | Commercial Automobile Liability
incurred and paid claims development
Incurred claims and allocated claim adjustment expenses, net of reinsurance	38,185,000	39,232,000	39,369,000	41,055,000	41,373,000	42,865,000
Total of Incurred-but-Not-Reported Liabilities Plus Expected Development of Reported Claims	$ (6,000)
Cumulative Number of Reported claims	6,134
Cumulative paid and allocated claim adjustment expenses, net of reinsurance	$ 33,569,000	31,389,000	28,721,000	24,409,000	20,106,000	10,407,000
2017 | Commercial Automobile Physical Damage
incurred and paid claims development
Incurred claims and allocated claim adjustment expenses, net of reinsurance	18,774,000	18,780,000	18,834,000	19,021,000	19,200,000	19,691,000
Total of Incurred-but-Not-Reported Liabilities Plus Expected Development of Reported Claims	$ 2,000
Cumulative Number of Reported claims | claim	13,113
Cumulative paid and allocated claim adjustment expenses, net of reinsurance	$ 18,772,000	18,786,000	18,787,000	18,915,000	19,336,000	17,957,000
2017 | Homeowners Liability
incurred and paid claims development
Incurred claims and allocated claim adjustment expenses, net of reinsurance	7,053,000	7,819,000	8,585,000	9,328,000	10,058,000	11,276,000
Total of Incurred-but-Not-Reported Liabilities Plus Expected Development of Reported Claims	$ 267,000
Cumulative Number of Reported claims | claim	269
Cumulative paid and allocated claim adjustment expenses, net of reinsurance	$ 4,765,000	4,217,000	3,593,000	2,913,000	1,676,000	305,000
2017 | Homeowners Property Damage
incurred and paid claims development
Incurred claims and allocated claim adjustment expenses, net of reinsurance	67,388,000	67,530,000	68,737,000	70,689,000	76,560,000	80,736,000
Total of Incurred-but-Not-Reported Liabilities Plus Expected Development of Reported Claims	$ 385,000
Cumulative Number of Reported claims | claim	6,011
Cumulative paid and allocated claim adjustment expenses, net of reinsurance	$ 66,826,000	66,765,000	66,892,000	66,181,000	64,401,000	$ 46,366,000
2018 | Private Passenger Automobile Liability
incurred and paid claims development
Incurred claims and allocated claim adjustment expenses, net of reinsurance	166,046,000	168,185,000	170,447,000	175,222,000	176,411,000
Total of Incurred-but-Not-Reported Liabilities Plus Expected Development of Reported Claims	$ (3,040,000)
Cumulative Number of Reported claims | claim	43,085
Cumulative paid and allocated claim adjustment expenses, net of reinsurance	$ 159,066,000	154,169,000	143,656,000	126,456,000	72,895,000
2018 | Private Passenger Automobile Physical Damage
incurred and paid claims development
Incurred claims and allocated claim adjustment expenses, net of reinsurance	128,003,000	128,090,000	128,426,000	130,145,000	129,450,000
Total of Incurred-but-Not-Reported Liabilities Plus Expected Development of Reported Claims	$ (63,000)
Cumulative Number of Reported claims | claim	119,760
Cumulative paid and allocated claim adjustment expenses, net of reinsurance	$ 128,054,000	128,154,000	128,624,000	132,591,000	138,036,000
2018 | Commercial Automobile Liability
incurred and paid claims development
Incurred claims and allocated claim adjustment expenses, net of reinsurance	36,014,000	37,322,000	38,589,000	40,115,000	41,347,000
Total of Incurred-but-Not-Reported Liabilities Plus Expected Development of Reported Claims	$ 107,000
Cumulative Number of Reported claims	5,744
Cumulative paid and allocated claim adjustment expenses, net of reinsurance	$ 29,336,000	26,774,000	23,544,000	18,499,000	9,704,000
2018 | Commercial Automobile Physical Damage
incurred and paid claims development
Incurred claims and allocated claim adjustment expenses, net of reinsurance	19,196,000	19,210,000	19,270,000	19,937,000	21,230,000
Total of Incurred-but-Not-Reported Liabilities Plus Expected Development of Reported Claims	$ 2,000
Cumulative Number of Reported claims | claim	12,907
Cumulative paid and allocated claim adjustment expenses, net of reinsurance	$ 19,194,000	19,208,000	19,236,000	19,842,000	18,842,000
2018 | Homeowners Liability
incurred and paid claims development
Incurred claims and allocated claim adjustment expenses, net of reinsurance	8,616,000	9,768,000	9,951,000	9,951,000	9,951,000
Total of Incurred-but-Not-Reported Liabilities Plus Expected Development of Reported Claims	$ 375,000
Cumulative Number of Reported claims | claim	254
Cumulative paid and allocated claim adjustment expenses, net of reinsurance	$ 5,664,000	4,597,000	3,972,000	2,039,000	551,000
2018 | Homeowners Property Damage
incurred and paid claims development
Incurred claims and allocated claim adjustment expenses, net of reinsurance	73,996,000	74,989,000	77,970,000	82,581,000	83,443,000
Total of Incurred-but-Not-Reported Liabilities Plus Expected Development of Reported Claims	$ 461,000
Cumulative Number of Reported claims | claim	8,239
Cumulative paid and allocated claim adjustment expenses, net of reinsurance	$ 73,307,000	73,119,000	72,078,000	70,959,000	$ 57,704,000
2019 | Private Passenger Automobile Liability
incurred and paid claims development
Incurred claims and allocated claim adjustment expenses, net of reinsurance	166,940,000	170,477,000	174,439,000	176,171,000
Total of Incurred-but-Not-Reported Liabilities Plus Expected Development of Reported Claims	$ (4,648,000)
Cumulative Number of Reported claims | claim	40,564
Cumulative paid and allocated claim adjustment expenses, net of reinsurance	$ 154,633,000	143,570,000	127,910,000	72,219,000
2019 | Private Passenger Automobile Physical Damage
incurred and paid claims development
Incurred claims and allocated claim adjustment expenses, net of reinsurance	123,858,000	124,332,000	126,648,000	128,698,000
Total of Incurred-but-Not-Reported Liabilities Plus Expected Development of Reported Claims	$ (116,000)
Cumulative Number of Reported claims | claim	117,022
Cumulative paid and allocated claim adjustment expenses, net of reinsurance	$ 123,974,000	124,467,000	128,173,000	134,429,000
2019 | Commercial Automobile Liability
incurred and paid claims development
Incurred claims and allocated claim adjustment expenses, net of reinsurance	46,964,000	48,783,000	49,163,000	51,679,000
Total of Incurred-but-Not-Reported Liabilities Plus Expected Development of Reported Claims	$ 666,000
Cumulative Number of Reported claims	5,682
Cumulative paid and allocated claim adjustment expenses, net of reinsurance	$ 36,048,000	28,373,000	22,480,000	12,113,000
2019 | Commercial Automobile Physical Damage
incurred and paid claims development
Incurred claims and allocated claim adjustment expenses, net of reinsurance	18,685,000	18,956,000	19,652,000	20,039,000
Total of Incurred-but-Not-Reported Liabilities Plus Expected Development of Reported Claims	$ 0
Cumulative Number of Reported claims | claim	12,757
Cumulative paid and allocated claim adjustment expenses, net of reinsurance	$ 18,681,000	18,752,000	19,161,000	18,128,000
2019 | Homeowners Liability
incurred and paid claims development
Incurred claims and allocated claim adjustment expenses, net of reinsurance	11,371,000	11,949,000	13,848,000	14,130,000
Total of Incurred-but-Not-Reported Liabilities Plus Expected Development of Reported Claims	$ 396,000
Cumulative Number of Reported claims | claim	261
Cumulative paid and allocated claim adjustment expenses, net of reinsurance	$ 6,038,000	5,183,000	3,343,000	1,634,000
2019 | Homeowners Property Damage
incurred and paid claims development
Incurred claims and allocated claim adjustment expenses, net of reinsurance	65,624,000	68,769,000	73,697,000	77,976,000
Total of Incurred-but-Not-Reported Liabilities Plus Expected Development of Reported Claims	$ 705,000
Cumulative Number of Reported claims | claim	5,452
Cumulative paid and allocated claim adjustment expenses, net of reinsurance	$ 64,427,000	63,536,000	61,905,000	$ 49,121,000
2020 | Private Passenger Automobile Liability
incurred and paid claims development
Incurred claims and allocated claim adjustment expenses, net of reinsurance	120,060,000	125,888,000	130,335,000
Total of Incurred-but-Not-Reported Liabilities Plus Expected Development of Reported Claims	$ (5,880,000)
Cumulative Number of Reported claims | claim	26,172
Cumulative paid and allocated claim adjustment expenses, net of reinsurance	$ 102,601,000	88,037,000	52,962,000
2020 | Private Passenger Automobile Physical Damage
incurred and paid claims development
Incurred claims and allocated claim adjustment expenses, net of reinsurance	97,644,000	97,244,000	98,546,000
Total of Incurred-but-Not-Reported Liabilities Plus Expected Development of Reported Claims	$ (451,000)
Cumulative Number of Reported claims | claim	81,852
Cumulative paid and allocated claim adjustment expenses, net of reinsurance	$ 98,083,000	98,819,000	102,764,000
2020 | Commercial Automobile Liability
incurred and paid claims development
Incurred claims and allocated claim adjustment expenses, net of reinsurance	30,869,000	31,930,000	35,010,000
Total of Incurred-but-Not-Reported Liabilities Plus Expected Development of Reported Claims	$ 2,867,000
Cumulative Number of Reported claims	3,463
Cumulative paid and allocated claim adjustment expenses, net of reinsurance	$ 16,268,000	13,166,000	7,025,000
2020 | Commercial Automobile Physical Damage
incurred and paid claims development
Incurred claims and allocated claim adjustment expenses, net of reinsurance	16,606,000	16,334,000	16,507,000
Total of Incurred-but-Not-Reported Liabilities Plus Expected Development of Reported Claims	$ 198,000
Cumulative Number of Reported claims | claim	9,620
Cumulative paid and allocated claim adjustment expenses, net of reinsurance	$ 16,407,000	16,596,000	15,550,000
2020 | Homeowners Liability
incurred and paid claims development
Incurred claims and allocated claim adjustment expenses, net of reinsurance	11,025,000	13,708,000	14,664,000
Total of Incurred-but-Not-Reported Liabilities Plus Expected Development of Reported Claims	$ 700,000
Cumulative Number of Reported claims | claim	222
Cumulative paid and allocated claim adjustment expenses, net of reinsurance	$ 3,845,000	3,254,000	220,000
2020 | Homeowners Property Damage
incurred and paid claims development
Incurred claims and allocated claim adjustment expenses, net of reinsurance	72,622,000	76,638,000	80,093,000
Total of Incurred-but-Not-Reported Liabilities Plus Expected Development of Reported Claims	$ 344,000
Cumulative Number of Reported claims | claim	6,108
Cumulative paid and allocated claim adjustment expenses, net of reinsurance	$ 68,706,000	65,927,000	$ 50,304,000
2021 | Private Passenger Automobile Liability
incurred and paid claims development
Incurred claims and allocated claim adjustment expenses, net of reinsurance	147,391,000	146,997,000
Total of Incurred-but-Not-Reported Liabilities Plus Expected Development of Reported Claims	$ (18,015,000)
Cumulative Number of Reported claims | claim	29,994
Cumulative paid and allocated claim adjustment expenses, net of reinsurance	$ 111,516,000	56,826,000
2021 | Private Passenger Automobile Physical Damage
incurred and paid claims development
Incurred claims and allocated claim adjustment expenses, net of reinsurance	122,549,000	122,943,000
Total of Incurred-but-Not-Reported Liabilities Plus Expected Development of Reported Claims	$ (1,379,000)
Cumulative Number of Reported claims | claim	89,521
Cumulative paid and allocated claim adjustment expenses, net of reinsurance	$ 123,847,000	123,636,000
2021 | Commercial Automobile Liability
incurred and paid claims development
Incurred claims and allocated claim adjustment expenses, net of reinsurance	39,564,000	41,814,000
Total of Incurred-but-Not-Reported Liabilities Plus Expected Development of Reported Claims	$ 229,000
Cumulative Number of Reported claims	4,260
Cumulative paid and allocated claim adjustment expenses, net of reinsurance	$ 17,925,000	7,883,000
2021 | Commercial Automobile Physical Damage
incurred and paid claims development
Incurred claims and allocated claim adjustment expenses, net of reinsurance	21,524,000	20,156,000
Total of Incurred-but-Not-Reported Liabilities Plus Expected Development of Reported Claims	$ (124,000)
Cumulative Number of Reported claims | claim	11,494
Cumulative paid and allocated claim adjustment expenses, net of reinsurance	$ 21,620,000	18,610,000
2021 | Homeowners Liability
incurred and paid claims development
Incurred claims and allocated claim adjustment expenses, net of reinsurance	12,797,000	12,797,000
Total of Incurred-but-Not-Reported Liabilities Plus Expected Development of Reported Claims	$ (1,094,000)
Cumulative Number of Reported claims | claim	210
Cumulative paid and allocated claim adjustment expenses, net of reinsurance	$ 3,388,000	218,000
2021 | Homeowners Property Damage
incurred and paid claims development
Incurred claims and allocated claim adjustment expenses, net of reinsurance	75,011,000	75,696,000
Total of Incurred-but-Not-Reported Liabilities Plus Expected Development of Reported Claims	$ (8,085,000)
Cumulative Number of Reported claims | claim	6,335
Cumulative paid and allocated claim adjustment expenses, net of reinsurance	$ 67,998,000	$ 51,390,000
2022 | Private Passenger Automobile Liability
incurred and paid claims development
Incurred claims and allocated claim adjustment expenses, net of reinsurance	157,921,000
Total of Incurred-but-Not-Reported Liabilities Plus Expected Development of Reported Claims	$ 2,617,000
Cumulative Number of Reported claims | claim	27,388
Cumulative paid and allocated claim adjustment expenses, net of reinsurance	$ 61,227,000
2022 | Private Passenger Automobile Physical Damage
incurred and paid claims development
Incurred claims and allocated claim adjustment expenses, net of reinsurance	141,041,000
Total of Incurred-but-Not-Reported Liabilities Plus Expected Development of Reported Claims	$ (23,926,000)
Cumulative Number of Reported claims | claim	92,198
Cumulative paid and allocated claim adjustment expenses, net of reinsurance	$ 142,002,000
2022 | Commercial Automobile Liability
incurred and paid claims development
Incurred claims and allocated claim adjustment expenses, net of reinsurance	43,496,000
Total of Incurred-but-Not-Reported Liabilities Plus Expected Development of Reported Claims	$ 12,054,000
Cumulative Number of Reported claims	3,893
Cumulative paid and allocated claim adjustment expenses, net of reinsurance	$ 10,941,000
2022 | Commercial Automobile Physical Damage
incurred and paid claims development
Incurred claims and allocated claim adjustment expenses, net of reinsurance	27,459,000
Total of Incurred-but-Not-Reported Liabilities Plus Expected Development of Reported Claims	$ (345,000)
Cumulative Number of Reported claims | claim	12,118
Cumulative paid and allocated claim adjustment expenses, net of reinsurance	$ 24,381,000
2022 | Homeowners Liability
incurred and paid claims development
Incurred claims and allocated claim adjustment expenses, net of reinsurance	12,973,000
Total of Incurred-but-Not-Reported Liabilities Plus Expected Development of Reported Claims	$ 4,724,000
Cumulative Number of Reported claims | claim	173
Cumulative paid and allocated claim adjustment expenses, net of reinsurance	$ 450,000
2022 | Homeowners Property Damage
incurred and paid claims development
Incurred claims and allocated claim adjustment expenses, net of reinsurance	72,523,000
Total of Incurred-but-Not-Reported Liabilities Plus Expected Development of Reported Claims	$ (4,404,000)
Cumulative Number of Reported claims | claim	4,770
Cumulative paid and allocated claim adjustment expenses, net of reinsurance	$ 48,906,000

Loss and Loss Adjustment Expe_5

Loss and Loss Adjustment Expense Reserves - Supplementary information about average historical claims (Details)	12 Months Ended
	Dec. 31, 2021
Private Passenger Automobile Liability
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance
Year 1	43%
Year 2	32.80%
Year 3	10.50%
Year 4	6.40%
Year 5	3%
Year 6	1.70%
Year 7	0.60%
Year 8	0.30%
Year 9	0.10%
Year 10	0.10%
Private Passenger Automobile Physical Damage
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance
Year 1	106.20%
Year 2	(4.3)
Year 3	(2.4)
Year 4	(0.3)
Year 5	(0.1)
Year 6	0%
Year 7	0%
Year 8	0%
Year 9	0%
Year 10	0%
Commercial Automobile Liability
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance
Year 1	26.20%
Year 2	25.20%
Year 3	12.20%
Year 4	11.80%
Year 5	7.10%
Year 6	5.80%
Year 7	3%
Year 8	0.70%
Year 9	1.20%
Year 10	0%
Commercial Automobile Physical Damage
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance
Year 1	94.40%
Year 2	6.70%
Year 3	(2.1)
Year 4	(0.4)
Year 5	0
Year 6	0
Year 7	0%
Year 8	0%
Year 9	0%
Year 10	0%
Homeowners Liability
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance
Year 1	5.80%
Year 2	24%
Year 3	15.50%
Year 4	10.20%
Year 5	11%
Year 6	10.40%
Year 7	3.20%
Year 8	0.90%
Year 9	0.10%
Year 10	0.30%
Homeowners Property Damage
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance
Year 1	71.60%
Year 2	21.10%
Year 3	4.60%
Year 4	0.80%
Year 5	0%
Year 6	0%
Year 7	(0.10%)
Year 8	0%
Year 9	0%
Year 10	0%

Loss and Loss Adjustment Expe_6

Loss and Loss Adjustment Expense Reserves - Disclosure of Incurred and Paid Claims Development to the Liability for Unpaid claims and Claim Adjustment Expenses (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Liability for Unpaid Claims and Claims Adjustment Expense, Incurred Claims [Abstract]
Prior years	$ 57,279	$ 53,673	$ 54,844
Reconciliation of the Disclosure of Incurred and Paid Claims Development to the Liability for Unpaid claims and Claim Adjustment Expenses
Net outstanding liabilities	426,739
Unallocated claims adjustment expenses	29,465
Private Passenger Automobile Liability
Reconciliation of the Disclosure of Incurred and Paid Claims Development to the Liability for Unpaid claims and Claim Adjustment Expenses
Net outstanding liabilities	176,810
Private Passenger Automobile Physical Damage
Reconciliation of the Disclosure of Incurred and Paid Claims Development to the Liability for Unpaid claims and Claim Adjustment Expenses
Net outstanding liabilities	(2,887)
Commercial Automobile Liability
Reconciliation of the Disclosure of Incurred and Paid Claims Development to the Liability for Unpaid claims and Claim Adjustment Expenses
Net outstanding liabilities	95,348
Commercial Automobile Physical Damage
Reconciliation of the Disclosure of Incurred and Paid Claims Development to the Liability for Unpaid claims and Claim Adjustment Expenses
Net outstanding liabilities	3,189
Homeowners Liability
Reconciliation of the Disclosure of Incurred and Paid Claims Development to the Liability for Unpaid claims and Claim Adjustment Expenses
Net outstanding liabilities	42,240
Homeowners Property Damage
Reconciliation of the Disclosure of Incurred and Paid Claims Development to the Liability for Unpaid claims and Claim Adjustment Expenses
Net outstanding liabilities	39,226
Other short-Duration Insurance Lines
Reconciliation of the Disclosure of Incurred and Paid Claims Development to the Liability for Unpaid claims and Claim Adjustment Expenses
Net outstanding liabilities	$ 72,813

Income Taxes (Details)

Income Taxes (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Current Income Taxes:
Federal	$ 21,317	$ 28,222	$ 31,133
State	74	15	267
Total Current Income Taxes	21,391	28,237	31,400
Deferred Income Taxes:
Federal	(8,371)	5,323	5,159
Total Deferred Income Tax Expense	(8,371)	5,323	5,159
Total income tax expense	$ 13,020	$ 33,560	$ 36,559

Income Taxes - Sources of Diffe

Income Taxes - Sources of Difference and Tax Effects (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Sources of the difference and the tax effects
Federal income tax expense, at statutory rate	$ 12,512	$ 34,496	$ 36,702
Investment income, net	(559)	(1,060)	(1,394)
State taxes, net	58	11	211
Nondeductible expenses	468	613	697
Tax related to share-based stock compensation	222	(101)	(298)
Other, net	319	(399)	641
Total income tax expense	$ 13,020	$ 33,560	$ 36,559

Income Taxes - Temporary Differ

Income Taxes - Temporary Differences (Details) - USD ($) $ in Thousands	Dec. 31, 2022	Dec. 31, 2021
Deferred tax assets:
Discounting of loss reserves	$ 4,790	$ 5,447
Discounting of unearned premium reserve	17,546	16,813
Net unrealized gains on investments	16,917
Bad debt allowance	329	430
Employee benefits	4,506	4,364
Rent incentive	684	797
Total deferred tax assets before valuation allowance	44,772	27,851
Total deferred tax assets	44,772	27,851
Deferred tax liabilities:
Deferred acquisition costs	(15,872)	(15,335)
Investments	(2,662)	(10,319)
Net unrealized gains on investments		(11,025)
Loss reserve transition adjustment	(831)	(1,108)
Software development costs	(2,913)	(3,591)
Premium acquisition expenses	(461)	(380)
Depreciation	(959)	(1,333)
Total deferred tax liabilities	(23,698)	(43,091)
Net deferred tax assets (liability)	21,074
Net deferred tax (liability)		(15,240)
Unrecognized tax benefits	0	0
Unrecognized tax benefits if recognized would affect the effective tax rate	0	0
Unrecognized tax benefits interest and penalties accrued	$ 0	$ 0

Share Repurchase Program (Detai

Share Repurchase Program (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020	Aug. 03, 2007
Share Repurchase Program
Share Repurchase Program	$ 200,000			$ 30,000
Number of common shares purchased during period under the program	170,904	139,405	551,598
Acquisition of treasury stock	$ 14,603	$ 11,563	$ 39,999
Treasury stock shares repurchased and reissued	3,141,477
Treasury stock repurchased and reissued, at cost	$ 150,000
Treasury stock shares	3,083,364	2,970,573
Treasury stock, at cost	$ 145,000	$ 135,397

Statutory Net Income and Surp_2

Statutory Net Income and Surplus (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2022 USD ($) item	Dec. 31, 2021 USD ($)	Dec. 31, 2020 USD ($)
Statutory Net Income and Surplus
Statutory net income	$ 66,197
Statutory capital and surplus	$ 782,200
Period of statutory measurement of income and dividends	12 months
Maximum available for dividends without approval	$ 78,220
Company's insurance company subsidiaries
Statutory Net Income and Surplus
Statutory net income	66,197	$ 97,169	$ 121,446
Statutory capital and surplus	$ 782,200	$ 826,979
Dividend limitation without prior permission, percentage of preceding surplus	10%
Period allowed for Commissioner to object to notice of an extraordinary dividend	30 days
Restricted net assets amount	$ 703,980
Number of levels of regulatory action, risk-based capital law | item	4
Minimum statutory capital and surplus or company action level risk-based capital	$ 200,806
Safety Insurance Company
Statutory Net Income and Surplus
Statutory capital and surplus	782,200
Recorded dividends	$ 94,260

Fair Value of Financial Instr_3

Fair Value of Financial Instruments Level 1 - 3 Inputs (Details) - USD ($) $ in Thousands	Dec. 31, 2022	Dec. 31, 2021
Fair value of financial instruments
Total investment securities	$ 1,050,155	$ 1,218,279
Short term investments	0	0
Fixed maturity securities, Estimated Fair Value	1,050,155	1,218,279
Equity securities, Estimated Fair Value	240,155	264,945
Total
Fair value of financial instruments
Total investment securities	1,249,860	1,444,654
Total | U.S. Treasury securities
Fair value of financial instruments
Fixed maturity securities, Estimated Fair Value	1,669	324
Total | Obligations of states and political subdivisions
Fair value of financial instruments
Fixed maturity securities, Estimated Fair Value	54,069	116,302
Total | Residential mortgage-backed securities
Fair value of financial instruments
Fixed maturity securities, Estimated Fair Value	234,502	241,464
Total | Commercial mortgage-backed securities
Fair value of financial instruments
Fixed maturity securities, Estimated Fair Value	139,931	150,883
Total | Other asset-backed securities
Fair value of financial instruments
Fixed maturity securities, Estimated Fair Value	68,731	83,596
Total | Corporate and other securities
Fair value of financial instruments
Fixed maturity securities, Estimated Fair Value	551,253	625,710
Total | Equity securities
Fair value of financial instruments
Equity securities, Estimated Fair Value	199,705	226,375
Level 1 Inputs
Fair value of financial instruments
Total investment securities	197,450	224,677
Level 1 Inputs | Equity securities
Fair value of financial instruments
Equity securities, Estimated Fair Value	197,450	224,677
Level 2 Inputs
Fair value of financial instruments
Total investment securities	1,050,155	1,218,279
Level 2 Inputs | U.S. Treasury securities
Fair value of financial instruments
Fixed maturity securities, Estimated Fair Value	1,669	324
Level 2 Inputs | Obligations of states and political subdivisions
Fair value of financial instruments
Fixed maturity securities, Estimated Fair Value	54,069	116,302
Level 2 Inputs | Residential mortgage-backed securities
Fair value of financial instruments
Fixed maturity securities, Estimated Fair Value	234,502	241,464
Level 2 Inputs | Commercial mortgage-backed securities
Fair value of financial instruments
Fixed maturity securities, Estimated Fair Value	139,931	150,883
Level 2 Inputs | Other asset-backed securities
Fair value of financial instruments
Fixed maturity securities, Estimated Fair Value	68,731	83,596
Level 2 Inputs | Corporate and other securities
Fair value of financial instruments
Fixed maturity securities, Estimated Fair Value	551,253	625,710
Level 3 Inputs
Fair value of financial instruments
Total investment securities	2,255	1,698
Level 3 Inputs | Equity securities
Fair value of financial instruments
Equity securities, Estimated Fair Value	$ 2,255	$ 1,698

Fair Value of Financial Instr_4

Fair Value of Financial Instruments Transfers between Levels (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Changes in the Company's Level 3 fair value securities
Transfers from Level 1 to Level 2	$ 0	$ 0
Transfers from Level 2 to Level 1	0	0
Balance at beginning of period	1,698	1,698	$ 516
Purchases	557		1,182
Transfers into Level 3	0	0	0
Transfers out of Level 3	0	0	0
Balance at end of period	2,255	1,698	$ 1,698
Alternative investments fair value	$ 40,450	$ 38,570
Period of advance notice before quarter end	45 days

Schedule I - Summary of Inves_2

Schedule I - Summary of Investments - Other than Investments in Related Parties (Details) - USD ($) $ in Thousands	Dec. 31, 2022	Dec. 31, 2021
Summary of investments - other than investments in related parties
Cost or Amortized Cost		$ 1,497,073
Estimated Fair Value	$ 1,403,160
Amount at which shown in the Balance Sheet	1,403,160
Total fixed maturities
Summary of investments - other than investments in related parties
Cost or Amortized Cost		1,152,779
Estimated Fair Value	1,050,155
Amount at which shown in the Balance Sheet	1,050,155
U.S. government and government agencies and authorities
Summary of investments - other than investments in related parties
Cost or Amortized Cost		261,703
Estimated Fair Value	236,171
Amount at which shown in the Balance Sheet	236,171
Obligations of states and political subdivisions
Summary of investments - other than investments in related parties
Cost or Amortized Cost		57,319
Estimated Fair Value	54,069
Amount at which shown in the Balance Sheet	54,069
Corporate and other securities.
Summary of investments - other than investments in related parties
Cost or Amortized Cost		833,757
Estimated Fair Value	759,915
Amount at which shown in the Balance Sheet	759,915
Total equity securities
Summary of investments - other than investments in related parties
Cost or Amortized Cost		231,444
Estimated Fair Value	240,155
Amount at which shown in the Balance Sheet	240,155
Industrial, miscellaneous and all other
Summary of investments - other than investments in related parties
Cost or Amortized Cost		231,444
Estimated Fair Value	240,155
Amount at which shown in the Balance Sheet	240,155
Other invested assets
Summary of investments - other than investments in related parties
Cost or Amortized Cost		$ 112,850
Estimated Fair Value	112,850
Amount at which shown in the Balance Sheet	$ 112,850

Schedule II - Condensed Finan_2

Schedule II - Condensed Financial Information of the Registrant (Details) - USD ($) $ in Thousands	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Assets
Investments in consolidated affiliates	$ 112,850	$ 87,911
Other	29,054	27,108
Total assets	1,972,569	2,117,391
Liabilities
Total liabilities	1,160,570	1,190,218
Shareholders' equity	811,999	927,173	$ 884,679	$ 808,406
Total liabilities and shareholders' equity	1,972,569	2,117,391
Registrant
Assets
Investments in consolidated affiliates	813,916	929,136
Other	9	24
Total assets	813,925	929,160
Liabilities
Accounts payable and other liabilities	1,926	1,987
Total liabilities	1,926	1,987
Shareholders' equity	811,999	927,173
Total liabilities and shareholders' equity	$ 813,925	$ 929,160

Schedule II - Condensed Finan_3

Schedule II - Condensed Financial Information of the Registrant Comprehensive Income (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Condensed Statements of Income and Comprehensive Income
Revenues	$ 797,559	$ 884,911	$ 846,248
Expenses	737,978	720,641	671,478
Net income	46,561	130,710	138,211
Other comprehensive (loss) income, net of tax	(105,117)	(28,948)	25,337
Comprehensive (loss) income	(58,556)	101,762	163,548
Registrant
Condensed Statements of Income and Comprehensive Income
Expenses	3,255	1,755	1,833
Net loss	(3,255)	(1,755)	(1,833)
Earnings from consolidated subsidiaries	49,816	132,465	140,044
Net income	46,561	130,710	138,211
Other comprehensive (loss) income, net of tax	(105,117)	(28,948)	25,337
Comprehensive (loss) income	$ (58,556)	$ 101,762	$ 163,548

Schedule II - Condensed Finan_4

Schedule II - Condensed Financial Information of the Registrant Cash Flow (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Condensed Statements of Cash Flows
Net income	$ 46,561	$ 130,710	$ 138,211
Adjustments to reconcile net income to net cash provided by operating activities:
Earnings from consolidated subsidiaries	(2,304)	(4,895)	(1,378)
Changes in assets and liabilities:
Other assets	(6,477)	(3,346)	(15)
Accounts payable and accrued liabilities	(2,680)	(2,876)	4,310
Net cash provided by operating activities	44,326	141,394	109,460
Acquisition net of cash received	(17,586)
Net cash used for investing activities	(19,988)	(65,989)	(35,524)
Dividends paid	(53,038)	(54,008)	(54,575)
Net cash used for financing activities	(62,641)	(65,571)	(64,574)
Net decrease in cash and cash equivalents	(38,303)	9,834	9,362
Cash and cash equivalents at end of period	25,300	63,603	53,769
Cash and cash equivalents at beginning of year	63,603	53,769	44,407
Registrant
Condensed Statements of Cash Flows
Net income	46,561	130,710	138,211
Adjustments to reconcile net income to net cash provided by operating activities:
Earnings from consolidated subsidiaries	(49,816)	(132,465)	(140,044)
Dividends received from consolidated subsidiaries	94,260	49,488	89,156
Amortization of restricted stock expense	6,022	6,304	7,248
Changes in assets and liabilities:
Intercompany receivable / payable	(11,376)	11,821	(93)
Other assets	15	15	15
Accounts payable and accrued liabilities	(75)	(302)	81
Net cash provided by operating activities	85,591	65,571	94,574
Acquisition net of cash received	(17,950)
Net cash used for investing activities	(17,950)
Dividends paid	(53,038)	(54,008)	(54,575)
Acquisition of treasury stock	(14,603)	(11,563)	(39,999)
Net cash used for financing activities	$ (67,641)	$ (65,571)	$ (94,574)

Schedule III - Supplementary _2

Schedule III - Supplementary Insurance Information (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Schedule III - Supplementary Insurance Information
Deferred Policy Acquisition Costs	$ 75,582	$ 73,024	$ 74,962
Future Policy Benefits, Losses, Claims and Loss Expenses	549,598	570,651	567,581
Unearned Premiums	433,375	413,487	421,901
Earned Premiums	758,505	774,328	771,078
Premium Revenue	758,505	774,328	771,078
Net Investment Income	46,725	44,135	41,045
Benefits, Claims, Losses, and Settlement Expenses	491,979	461,727	404,556
Amortization of Deferred Policy Acquisition Costs	146,013	146,573	146,955
Other Operating Expenses	99,132	111,819	119,527
Premiums Written	$ 773,735	$ 764,526	$ 763,537

Schedule IV - Reinsurance (Deta

Schedule IV - Reinsurance (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Insurance Earned Premiums
Gross Amount	$ 803,289	$ 811,329	$ 815,981
Ceded to Other Companies	73,760	67,584	74,268
Assumed from Other Companies	28,976	30,583	29,365
Net Amount	758,505	774,328	771,078
Property and Casualty Insurance
Insurance Earned Premiums
Gross Amount	803,289	811,329	815,981
Ceded to Other Companies	73,760	67,584	74,268
Assumed from Other Companies	28,976	30,583	29,365
Net Amount	$ 758,505	$ 774,328	$ 771,078
Percentage of Amount Assumed to Net	3.80%	3.90%	3.80%

Schedule V - Valuation and Qu_2

Schedule V - Valuation and Qualifying Accounts (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Movement in valuation and qualifying accounts
Balance at Beginning of Period	$ 1,808	$ 1,754	$ 578
Charged to Costs and Expenses	1,339	2,339	3,294
Deductions	1,701	2,285	2,118
Balance at End of Period	$ 1,446	$ 1,808	$ 1,754

Schedule VI - Supplemental In_2

Schedule VI - Supplemental Information Concerning Property and Casualty Insurance Operations (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Supplemental Information Concerning Property and Casualty Insurance Operations
Earned Premiums	$ 758,505	$ 774,328	$ 771,078
Current year	549,258	515,400	459,400
Prior year	(57,279)	(53,673)	(54,844)
Consolidated Property & Casualty Subsidiaries
Supplemental Information Concerning Property and Casualty Insurance Operations
Deferred Policy Acquisition Costs	75,582	73,024	74,962
Reserves for Unpaid Claims and Claims Adjustment Expenses	549,598	570,651	567,581
Unearned Premiums	433,375	413,487	421,901
Earned Premiums	758,505	774,328	771,078
Net Investment Income	46,725	44,135	41,045
Current year	549,258	515,400	459,400
Prior year	(57,279)	(53,673)	(54,844)
Amortization of Deferred Policy Acquisition Costs	146,013	146,573	146,955
Paid Claims and Claims Adjustment Expenses	515,759	443,013	431,480
Premiums Written	$ 773,735	$ 764,526	$ 763,537