Donegal (DGICA) 10-K 5 Mar 21 2020 FY Annual report Financial data

Cover Page

Cover Page - USD ($)	12 Months Ended
	Dec. 31, 2020	Mar. 01, 2021	Jun. 30, 2020
Document Information [Line Items]
Document Type	10-K
Amendment Flag	false
Entity Interactive Data Current	Yes
Document Period End Date	Dec. 31, 2020
Document Annual Report	true
Document Transition Report	false
Document Fiscal Year Focus	2020
Document Fiscal Period Focus	FY
Entity Registrant Name	DONEGAL GROUP INC.
Entity Central Index Key	0000800457
Current Fiscal Year End Date	--12-31
Entity Current Reporting Status	Yes
Entity File Number	0-15341
Entity Tax Identification Number	23-2424711
City Area Code	800
Local Phone Number	877-0600
Entity Address, Postal Zip Code	17547
Entity Shell Company	false
Entity Filer Category	Accelerated Filer
Entity Small Business	true
Entity Emerging Growth Company	false
Entity Incorporation, State or Country Code	DE
Entity Address, Address Line One	1195 River Road
Entity Address, City or Town	Marietta
Entity Address, State or Province	PA
Entity Well-known Seasoned Issuer	No
Entity Voluntary Filers	No
Entity Public Float			$ 216,494,411
ICFR Auditor Attestation Flag	true
Class A Common Stock [Member]
Document Information [Line Items]
Entity Common Stock, Shares Outstanding		24,699,005
Title of 12(b) Security	Common Stock
Trading Symbol	DGICA
Security Exchange Name	NASDAQ
Class B Common Stock [Member]
Document Information [Line Items]
Entity Common Stock, Shares Outstanding		5,576,775
Title of 12(b) Security	Common Stock
Trading Symbol	DGICB
Security Exchange Name	NASDAQ

Consolidated Balance Sheets

Consolidated Balance Sheets - USD ($)	Dec. 31, 2020	Dec. 31, 2019
Fixed maturities
Held to maturity, at amortized cost (fair value $632,640,821 and $500,314,344)	$ 586,609,439	$ 476,093,782
Available for sale, at fair value (amortized cost $534,958,100 and $556,839,278)	555,136,017	564,951,803
Equity securities, at fair value	58,556,173	55,477,556
Short-term investments, at cost, which approximates fair value	20,900,155	14,030,222
Total investments	1,221,201,784	1,110,553,363
Cash	103,094,236	49,318,930
Accrued investment income	7,936,879	7,066,029
Premiums receivable	169,596,332	165,732,949
Reinsurance receivable	408,908,850	367,021,468
Deferred policy acquisition costs	59,156,958	59,284,859
Deferred tax asset, net	5,683,113	8,514,311
Prepaid reinsurance premiums	169,418,333	142,475,767
Property and equipment, net	4,390,377	4,558,072
Accounts receivable - securities	67,676	4,961
Federal income taxes recoverable	3,089,369
Goodwill	5,625,354	5,625,354
Other intangible assets	958,010	958,010
Other	1,393,053	2,047,058
Total assets	2,160,520,324	1,923,161,131
Liabilities
Losses and loss expenses	962,007,437	869,673,849
Unearned premiums	537,189,598	510,147,485
Accrued expenses	29,115,198	28,453,744
Reinsurance balances payable	3,233,523	2,116,084
Borrowings under lines of credit	85,000,000	35,000,000
Cash dividends declared to stockholders	4,436,301	4,075,234
Subordinated debentures	5,000,000	5,000,000
Accounts payable - securities		1,119
Income taxes payable		84,831
Due to affiliate	10,293,495	10,069,171
Other	6,470,652	7,524,095
Total liabilities	1,642,746,204	1,472,145,612
Stockholders' Equity
Preferred stock, $.01 par value, authorized 2,000,000 shares; none issued
Additional paid-in capital	289,149,567	268,151,601
Accumulated other comprehensive income	11,130,612	504,170
Retained earnings	258,387,288	223,267,573
Treasury stock, at cost	(41,226,357)	(41,226,357)
Total stockholders' equity	517,774,120	451,015,519
Total liabilities and stockholders' equity	2,160,520,324	1,923,161,131
Class A Common Stock [Member]
Stockholders' Equity
Common stock value	276,518	262,040
Total stockholders' equity	276,518	262,040
Class B Common Stock [Member]
Stockholders' Equity
Common stock value	56,492	56,492
Total stockholders' equity	$ 56,492	$ 56,492

Consolidated Balance Sheets (Pa

Consolidated Balance Sheets (Parenthetical) - USD ($)	Dec. 31, 2020	Dec. 31, 2019
Held to maturity, fair value	$ 632,640,821	$ 500,314,344
Available for sale, amortized cost	$ 534,958,100	$ 556,839,278
Preferred stock, par value	$ 0.01	$ 0.01
Preferred stock, shares authorized	2,000,000	2,000,000
Preferred stock, shares issued	0	0
Class A Common Stock [Member]
Common stock, par value	$ 0.01	$ 0.01
Common stock, shares authorized	50,000,000	50,000,000
Common stock, shares issued	27,651,774	26,203,935
Common stock, shares outstanding	24,649,186	23,201,347
Class B Common Stock [Member]
Common stock, par value	$ 0.01	$ 0.01
Common stock, shares authorized	10,000,000	10,000,000
Common stock, shares issued	5,649,240	5,649,240
Common stock, shares outstanding	5,576,775	5,576,775

Consolidated Statements of Inco

Consolidated Statements of Income (Loss) and Comprehensive Income (Loss) - USD ($)	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Revenues
Net premiums earned (includes affiliated reinsurance of $192,861,276, $203,409,131 and $198,580,547 - see note 3)	$ 742,040,339	$ 756,078,400	$ 741,290,873
Investment income, net of investment expenses	29,504,466	29,514,955	26,907,656
Installment payment fees	3,063,097	4,134,749	5,256,721
Lease income	434,089	443,750	480,617
Net investment gains (losses)	2,777,919	21,984,617	(4,801,509)
Equity in earnings of Donegal Financial Services Corporation		295,000	2,693,962
Total revenues	777,819,910	812,451,471	771,828,320
Expenses
Net losses and loss expenses (includes affiliated reinsurance of $87,374,791, $103,218,679 and $140,113,591 - see note 3)	459,764,293	506,387,664	576,458,420
Amortization of deferred policy acquisition costs	119,072,000	122,443,000	120,964,000
Other underwriting expenses	125,862,651	114,561,741	113,270,131
Policyholder dividends	7,394,310	8,978,406	5,353,023
Interest	1,196,406	1,579,299	2,302,082
Other, net	1,257,747	1,420,331	1,717,513
Total expenses	714,547,407	755,370,441	820,065,169
Income (loss) before income tax expense (benefit)	63,272,503	57,081,030	(48,236,849)
Income tax expense (benefit)	10,457,251	9,929,286	(15,476,509)
Net income (loss)	52,815,252	47,151,744	(32,760,340)
Statements of Comprehensive Income (Loss)
Net income (loss)	52,815,252	47,151,744	(32,760,340)
Unrealized gain (loss) on securities:
Unrealized holding gain (loss) arising during the period, net of income tax expense (benefit) of $2,944,892, $3,947,082 and ($1,865,948)	11,078,406	14,848,545	(7,019,532)
Reclassification adjustment for (gains) losses included in net income (loss), net of income tax expense (benefit) of $120,142, $30,920 and ($104,841)	(451,964)	(116,316)	394,403
Other comprehensive income (loss)	10,626,442	14,732,229	(6,625,129)
Comprehensive income (loss)	$ 63,441,694	$ 61,883,973	$ (39,385,469)
Class A Common Stock [Member]
Basic earnings (loss) per common share:
Common stock - Basic	$ 1.84	$ 1.68	$ (1.18)
Diluted earnings (loss) per common share:
Common stock - Diluted	1.83	1.67	(1.18)
Class B Common Stock [Member]
Basic earnings (loss) per common share:
Common stock - Basic	1.65	1.51	(1.09)
Diluted earnings (loss) per common share:
Common stock - Diluted	$ 1.65	$ 1.51	$ (1.09)

Consolidated Statements of In_2

Consolidated Statements of Income (Loss) and Comprehensive Income (Loss) (Parenthetical) - USD ($)	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Net premiums earned - affiliated reinsurance	$ 192,861,276	$ 203,409,131	$ 198,580,547
Net realized investment gains (losses)	2,777,919	21,984,617	(4,801,509)
Net losses and loss expenses - affiliated reinsurance	87,374,791	103,218,679	140,113,591
Income tax expense (benefit)	10,457,251	9,929,286	(15,476,509)
Income tax expense (benefit) on unrealized holding gain (loss) arising during the period	2,944,892	3,947,082	1,865,948
Income tax (benefit) expense on reclassification adjustment for losses (gains)	120,142	30,920	104,841
Reclassification out of Accumulated Other Comprehensive Income [Member]
Net realized investment gains (losses)	572,106	147,236	499,244
Income tax expense (benefit)	$ 120,142	$ 30,920	$ 104,841

Consolidated Statements of Stoc

Consolidated Statements of Stockholders' Equity - USD ($)	Total	Additional Paid-In Capital [Member]	Accumulated Other Comprehensive (Loss) Income [Member]	Retained Earnings [Member]	Treasury Stock [Member]	Class A Common Stock [Member]	Class B Common Stock [Member]
Beginning balance at Dec. 31, 2017	$ 448,696,104	$ 255,401,558	$ (2,684,275)	$ 236,893,041	$ (41,226,357)	$ 255,645	$ 56,492
Beginning balance, shares at Dec. 31, 2017						25,564,481	5,649,240
Issuance of common stock (stock compensation plans)	2,470,969	2,469,220				$ 1,749
Issuance of common stock (stock compensation plans), shares						174,899
Stock-based compensation	2,853,911	2,853,111				$ 800
Stock-based compensation, Shares						79,961
Net income (loss)	(32,760,340)			(32,760,340)
Cash dividends	(15,765,614)			(15,765,614)
Grant of stock options		534,534		(534,534)
Reclassification of equity unrealized gains			(4,918,655)	4,918,655
Other comprehensive income (loss)	(6,625,129)		(6,625,129)
Ending balance at Dec. 31, 2018	398,869,901	261,258,423	(14,228,059)	192,751,208	(41,226,357)	$ 258,194	$ 56,492
Ending balance, shares at Dec. 31, 2018						25,819,341	5,649,240
Issuance of common stock (stock compensation plans)	2,227,198	2,225,527				$ 1,671
Issuance of common stock (stock compensation plans), shares						167,096
Stock-based compensation	4,253,840	4,251,665				$ 2,175
Stock-based compensation, Shares						217,498
Net income (loss)	47,151,744			47,151,744
Cash dividends	(16,219,393)			(16,219,393)
Grant of stock options		415,986		(415,986)
Other comprehensive income (loss)	14,732,229		14,732,229
Ending balance at Dec. 31, 2019	451,015,519	268,151,601	504,170	223,267,573	(41,226,357)	$ 262,040	$ 56,492
Ending balance, shares at Dec. 31, 2019						26,203,935	5,649,240
Issuance of common stock (stock compensation plans)	2,059,036	2,057,504				$ 1,532
Issuance of common stock (stock compensation plans), shares						153,233
Stock-based compensation	18,595,031	18,582,085				$ 12,946
Stock-based compensation, Shares						1,294,606
Net income (loss)	52,815,252			52,815,252
Cash dividends	(17,337,160)			(17,337,160)
Grant of stock options		358,377		(358,377)
Other comprehensive income (loss)	10,626,442		10,626,442
Ending balance at Dec. 31, 2020	$ 517,774,120	$ 289,149,567	$ 11,130,612	$ 258,387,288	$ (41,226,357)	$ 276,518	$ 56,492
Ending balance, shares at Dec. 31, 2020						27,651,774	5,649,240

Consolidated Statements of Cash

Consolidated Statements of Cash Flows - USD ($)	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Cash Flows from Operating Activities:
Net income (loss)	$ 52,815,252	$ 47,151,744	$ (32,760,340)
Adjustments to reconcile net income (loss) to net cash provided by operating activities:
Depreciation, amortization and other non-cash items	6,721,621	5,573,074	6,609,632
Net investment (gains) losses	(2,777,919)	(21,984,617)	4,801,509
Equity in earnings of Donegal Financial Services Corporation		(295,000)	(2,693,962)
Changes in Assets and Liabilities:
Losses and loss expenses	92,333,588	55,008,625	137,993,497
Unearned premiums	27,042,113	3,618,879	3,072,065
Accrued expenses	661,454	3,011,598	(2,591,630)
Premiums receivable	(3,863,383)	(9,030,699)	3,704,182
Deferred policy acquisition costs	127,901	1,330,268	(325,267)
Deferred income taxes	6,448	649,928	(4,179,805)
Reinsurance receivable	(41,887,382)	(23,652,403)	(45,026,502)
Accrued investment income	(870,850)	(504,830)	(8,078)
Amounts due to affiliate	224,324	(805,369)	3,560,172
Reinsurance balances payable	1,117,439	(1,766,109)	(233,966)
Prepaid reinsurance premiums	(26,942,566)	(7,095,990)	(347,136)
Current income taxes	(3,174,200)	19,117,435	(8,097,499)
Other, net	(399,440)	6,033,243	299,262
Net adjustments	48,319,148	29,208,033	96,536,474
Net cash provided by operating activities	101,134,400	76,359,777	63,776,134
Purchases of fixed maturities:
Held to maturity	(157,048,527)	(96,724,391)	(48,969,776)
Available for sale	(176,500,255)	(165,989,508)	(116,961,667)
Purchases of equity securities	(6,964,092)	(20,722,416)	(11,303,361)
Sales of fixed maturities:
Available for sale	22,172,930	19,527,658	13,202,367
Maturity of fixed maturities:
Held to maturity	47,448,424	24,460,749	13,184,665
Available for sale	172,084,542	119,113,273	105,266,805
Sales of equity securities	6,091,288	40,465,748	13,779,330
Net purchases of property and equipment	(89,702)	(149,603)	(105,525)
Net (purchases) sales of short-term investments	(6,869,933)	2,718,538	(5,698,845)
Net cash used in investing activities	(99,675,325)	(43,377,179)	(37,606,007)
Cash Flows from Financing Activities:
Issuance of common stock	19,292,324	4,834,514	3,249,849
Cash dividends paid	(16,976,093)	(16,092,643)	(15,658,950)
Payments on lines of credit		(25,000,000)
Borrowings under lines of credit	50,000,000		1,000,000
Net cash provided by (used in) financing activities	52,316,231	(36,258,129)	(11,409,101)
Net increase (decrease) in cash	53,775,306	(3,275,531)	14,761,026
Cash at beginning of year	49,318,930	52,594,461	37,833,435
Cash at end of year	$ 103,094,236	49,318,930	$ 52,594,461
Donegal Financial Services Corporation [Member]
Maturity of fixed maturities:
Sale of investment in Donegal Financial Services Corporation		$ 33,922,773

Summary of Significant Accounti

Summary of Significant Accounting Policies	12 Months Ended
	Dec. 31, 2020
Accounting Policies [Abstract]
Summary of Significant Accounting Policies	1 - Summary of Significant Accounting Policies Organization and Business Donegal Mutual Insurance Company (“Donegal Mutual”) organized us as an insurance holding company on August 26, 1986. Our insurance subsidiaries, Atlantic States Insurance Company (“Atlantic States”), Southern Insurance Company of Virginia (“Southern”), the Peninsula Insurance Group (“Peninsula”), which consists of Peninsula Indemnity Company and The Peninsula Insurance Company and Michigan Insurance Company (“MICO”), and affiliates write personal and commercial lines of property and casualty coverages exclusively through a network of independent insurance agents in certain Mid-Atlantic, We have three segments: our investment function, our commercial lines of insurance and our personal lines of insurance. The commercial lines products of our insurance subsidiaries consist primarily of commercial automobile, commercial multi-peril and workers’ compensation policies. The personal lines products of our insurance subsidiaries consist primarily of homeowners and private passenger automobile policies. At December 31, 2020, Donegal Mutual held approximately 42% of our outstanding Class A common stock and approximately 84% of our outstanding Class B common stock. This ownership provides Donegal Mutual with approximately 71% of the total voting power of our common stock. Our insurance subsidiaries and Donegal Mutual have interrelated operations due to a pooling agreement and other intercompany agreements and transactions. While each company maintains its separate corporate existence, our insurance subsidiaries and Donegal Mutual conduct business together as the Donegal Insurance Group. As such, Donegal Mutual and our insurance subsidiaries share the same business philosophy, the same management, the same employees and the same facilities and offer the same types of insurance products. Atlantic States, our largest subsidiary, participates in a proportional reinsurance agreement, or pooling agreement, with Donegal Mutual. Under the pooling agreement, Donegal Mutual and Atlantic States contribute substantially all of their respective premiums, losses and loss expenses to the underwriting pool, and the underwriting pool, acting through Donegal Mutual, then allocates of the pooled business to Atlantic States. Thus, Donegal Mutual and Atlantic States share the underwriting results of the pooled business in proportion to their respective participation in the underwriting pool. In addition, Donegal Mutual has a 100% quota-share reinsurance agreement with Southern Mutual Insurance Company, or Southern Mutual. Donegal Mutual places its assumed business from Southern Mutual into the underwriting pool. The same executive management and underwriting personnel administer products, classes of business underwritten, pricing practices and underwriting standards of Donegal Mutual and our insurance subsidiaries. In addition, as the Donegal Insurance Group, Donegal Mutual and our insurance subsidiaries share a combined business plan to achieve market penetration and underwriting profitability objectives. The products our insurance subsidiaries and Donegal Mutual market are generally complementary, thereby allowing the Donegal Insurance Group to offer a broader range of products to a given market and to expand the Donegal Insurance Group’s ability to service an entire personal lines or commercial lines account. Distinctions within the products of Donegal Mutual and our insurance subsidiaries generally relate to specific risk profiles targeted within similar classes of business, such as preferred tier versus standard tier products, but we do not allocate all of the standard risk gradients to one company. Therefore, the underwriting profitability of the business the individual companies write directly will vary. However, the underwriting pool homogenizes the risk characteristics of all business that Donegal Mutual and Atlantic States write directly. The business Atlantic States derives from the underwriting pool represents a significant percentage of our total consolidated revenues. We refer to Note 3 - Transactions with Affiliates for more information regarding the pooling agreement. Donegal Mutual completed the merger of Mountain States Mutual Casualty Company, or Mountain States, with and into Donegal Mutual effective May 25, 2017. Donegal Mutual was the surviving company in the merger, and Mountain States’ insurance subsidiaries, Mountain States Indemnity Company and Mountain States Commercial Insurance Company (collectively, the “Mountain States insurance subsidiaries”), became insurance subsidiaries of Donegal Mutual upon completion of the merger. Upon completion of the merger, Donegal Mutual assumed all of the policy obligations of Mountain States and began to market its products together with the Mountain States insurance subsidiaries as the Mountain States Insurance Group in four Southwestern states. Donegal Mutual also entered into a 100% quota-share reinsurance agreement with the Mountain States insurance subsidiaries on the merger date. Beginning with policies effective in 2021, Donegal Mutual began to place the business of the Mountain States Insurance Group into the underwriting pool. As a result, our consolidated financial results through December 31, 2020 excluded the results of the Mountain States Insurance Group operations in those Southwestern states. We and Donegal Mutual sold DFSC to Northwest Bancshares, Inc. (“Northwest”) on March 8, 2019, resulting in proceeds valued at approximately $85.8 million in a combination of cash and Northwest common stock. Immediately prior to the closing of the merger, DFSC paid a dividend of approximately $29.2 million to us and Donegal Mutual. As the owner of 48.2% of DFSC’s common stock, we received a dividend payment from DFSC of approximately $14.1 million and consideration from Northwest that included a combination of cash in the amount of $20.5 million and Northwest common stock with a fair value at the closing date of $20.9 million. We recorded a gain of $12.7 million from the sale of DFSC in our results of operations for the first quarter of 2019. We sold the Northwest common stock that we received as part of the consideration during 2019. This transaction represented the culmination of a banking strategy that began with the formation of DFSC in 2000. Effective December 1, 2019, our insurance subsidiaries Le Mars Insurance Company (“Le Mars”) and Sheboygan Falls Insurance Company (“Sheboygan Falls”) merged with and into Atlantic States (the “Mergers”). As a result of the Mergers, the separate corporate existences of Le Mars and Sheboygan Falls ceased and Atlantic States continued as the surviving insurance company. Atlantic States placed the business of Le Mars and Sheboygan Falls, as their policies renewed subsequent to the effective date of the Mergers, into the underwriting pool. In July 2018, we consolidated the branch office operations of Peninsula into our home office operations to achieve economies of scale and enhance service levels for the policyholders of Peninsula. We recorded a restructuring charge of approximately $1.9 million in 2018 for employee termination costs associated with the Peninsula consolidation. We completed the sale of Peninsula’s branch office in 2019 for net proceeds of $1.2 million. We recorded an impairment charge of $1.1 million in other expenses in 2018 related to the value of this real estate. Basis of Consolidation Our consolidated financial statements, which we have prepared in accordance with accounting principles generally accepted in the United States of America (“GAAP”), include our accounts and those of our wholly owned subsidiaries. We have eliminated all significant inter-company accounts and transactions in consolidation. The terms “we,” “us,” “our” or the “Company” as we use them in the notes to our consolidated financial statements refer to the consolidated entity. Use of Estimates In preparing our consolidated financial statements, our management makes estimates and assumptions that affect the reported amounts of assets and liabilities at the date of the balance sheet and revenues and expenses for the period then ended. Actual results could differ significantly from those estimates. We make estimates and assumptions that could have a significant effect on amounts and disclosures we report in our consolidated financial statements. The most significant estimates relate to our insurance subsidiaries’ reserves for property and casualty insurance unpaid losses and loss expenses. While we believe our estimates and the estimates of our insurance subsidiaries are appropriate, the ultimate amounts may differ from the estimates provided. We regularly review our methods for making these estimates as well as the continuing appropriateness of the estimated amounts, and we reflect any adjustment we consider necessary in our current results of operations. Reclassification We have made certain reclassifications in our prior period financial statements to conform to the current year presentation. Investments We classify our debt securities into the following categories: Held to Maturity - Debt securities that we have the positive intent and ability to hold to maturity; reported at amortized cost. Available for Sale - Debt securities not classified as held to maturity; reported at fair value, with unrealized gains and losses excluded from income and reported as a separate component of stockholders’ equity (net of tax effects). Short-term investments are carried at amortized cost, which approximates fair value. We make estimates concerning the valuation of our investments and the recognition of other-than-temporary declines in the value of our investments. For equity securities, we measure investments at fair value and recognize changes in fair value in our results of operations. With respect to a debt security that is in an unrealized loss position, we first assess if we intend to sell the debt security. If we determine we intend to sell the debt security, we recognize the impairment loss in our results of operations. If we do not intend to sell the debt security, we determine whether it is more likely than not that we will be required to sell the debt security prior to recovery. If we determine it is more likely than not that we will be required to sell the debt security prior to recovery, we recognize an impairment loss in our results of operations. If we determine it is more likely than not that we will not be required to sell the debt security prior to recovery, we then evaluate whether a credit loss has occurred. We determine whether a credit loss has occurred by comparing the amortized cost of the debt security to the present value of the cash flows we expect to collect. If we expect a cash flow shortfall, we consider that a credit loss has occurred. If we determine that a credit loss has occurred, we consider the impairment to be other than temporary. We then recognize the amount of the impairment loss related to the credit loss in our results of operations, and we recognize the remaining portion of the impairment loss in our other comprehensive income, net of applicable taxes. In addition, we may write down securities in an unrealized loss position based on a number of other factors, including when the fair value of an investment is significantly below its cost, when the financial condition of the issuer of a security has deteriorated, the occurrence of industry, company or geographic events that have negatively impacted the value of a security and rating agency downgrades. We amortize premiums and discounts on debt securities over the life of the security as an adjustment to yield using the effective interest method. We compute investment gains and losses using the specific identification method. We amortize premiums and discounts for mortgage-backed debt securities using anticipated prepayments. Fair Values of Financial Instruments We use the following methods and assumptions in estimating our fair value disclosures: Investments - We present our investments in available-for-sale that have quoted prices in active markets. For fixed maturity securities that generally do not trade on a daily basis, the pricing services prepare estimates of fair value measurements based predominantly on observable market inputs. The pricing services do not use broker quotes in determining the fair values of our investments. Our investment personnel review the estimates of fair value the pricing services provide to determine if the estimates we obtain are representative of fair values based upon the general knowledge of our investment personnel of the market, their research findings related to unusual fluctuations in value and their comparison of such values to execution prices for similar securities. Our investment personnel monitor the market and are familiar with current trading ranges for similar securities and the pricing of specific investments. Our investment personnel review all pricing estimates that we receive from the pricing services against their expectations with respect to pricing based on fair market curves, security ratings, coupon rates, security type and recent trading activity. Our investment personnel review documentation with respect to the pricing services’ pricing methodology that they obtain periodically to determine if the primary pricing sources, market inputs and pricing frequency for various security types are reasonable. We refer to Note 5 - Fair Value Measurements for more information regarding our methods and assumptions in estimating fair values. Cash and Short-Term Investments - The carrying amounts we report in the balance sheet for these instruments approximate their fair values. Premiums and Reinsurance Receivables and Payables - The carrying amounts we report in the balance sheet for these instruments related to premiums and paid losses and loss expenses approximate their fair values. Subordinated Debentures - The carrying amounts we report in the balance sheet for these instruments approximate their fair values. Revenue Recognition Our insurance subsidiaries recognize insurance premiums as income over the terms of the policies they issue. Our insurance subsidiaries calculate unearned premiums on a daily pro-rata Policy Acquisition Costs We defer our insurance subsidiaries’ policy acquisition costs, consisting primarily of commissions, premium taxes and certain other underwriting costs, reduced by ceding commissions, related directly to the successful acquisition of new or renewal insurance contracts. We amortize these deferred policy acquisition costs over the period in which our insurance subsidiaries earn the premiums. The method we follow in computing deferred policy acquisition costs limits the amount of such deferred costs to their estimated realizable value, which gives effect to the premium to be earned, related investment income, losses and loss expenses and certain other costs we expect to incur as our insurance subsidiaries earn the premium. Estimates in the calculation of policy acquisition costs have not shown material variability because of uncertainties in applying accounting principles or as a result of sensitivities to changes in key assumptions. Property and Equipment We report property and equipment at depreciated cost that we compute using the straight-line method based upon estimated useful lives of the assets. Losses and Loss Expenses Liabilities for losses and loss expenses are estimates at a given point in time of the amounts an insurer expects to pay with respect to incurred policyholder claims based on facts and circumstances the insurer knows at that point in time. For example, legislative, judicial and regulatory actions may expand coverage definitions, retroactively mandate coverage or otherwise require our insurance subsidiaries to pay losses for damages that their policies explicitly excluded or did not intend to cover. At the time of establishing its estimates, an insurer recognizes that its ultimate liability for losses and loss expenses will exceed or be less than such estimates. Our insurance subsidiaries base their estimates of liabilities for losses and loss expenses on assumptions as to future loss trends, expected claims severity, judicial theories of liability and other factors. However, during the loss adjustment period, our insurance subsidiaries may learn additional facts regarding individual claims, and, consequently, it often becomes necessary for our insurance subsidiaries to refine and adjust their estimates for these liabilities. We reflect any adjustments to the liabilities for losses and loss expenses of our insurance subsidiaries in our consolidated results of operations in the period in which our insurance subsidiaries make adjustments to their estimates. Our insurance subsidiaries maintain liabilities for the payment of losses and loss expenses with respect to both reported and unreported claims. Our insurance subsidiaries establish these liabilities for the purpose of covering the ultimate costs of settling all losses, including investigation and litigation costs. Our insurance subsidiaries base the amount of their liability for reported losses primarily upon a case-by-case Reserve estimates can change over time because of unexpected changes in assumptions related to our insurance subsidiaries’ external environment and, to a lesser extent, assumptions related to our insurance subsidiaries’ internal operations. For example, our insurance subsidiaries have experienced an increase in claims severity and a lengthening of the claim settlement periods on bodily injury claims during the past several years. In addition, the COVID-19 Our insurance subsidiaries seek to enhance their underwriting results by carefully selecting the product lines they underwrite. Our insurance subsidiaries’ personal lines products primarily include standard and preferred risks in private passenger automobile and homeowners lines. Our insurance subsidiaries’ commercial lines products primarily include business offices, wholesalers, service providers, contractors, artisans and light manufacturing operations. Our insurance subsidiaries have limited exposure to asbestos and other environmental liabilities. Our insurance subsidiaries write no medical malpractice liability risks. Income Taxes We currently file a consolidated federal income tax return that includes us and our insurance subsidiaries. We account for income taxes using the asset and liability method. The objective of the asset and liability method is to establish deferred tax assets and liabilities for the temporary differences between the financial reporting basis and the tax basis of our assets and liabilities at enacted tax rates we expect to be in effect when we realize or settle such amounts. Credit Risk Our objective is to earn competitive returns by investing in a diversified portfolio of securities. Our portfolio of fixed maturity securities and, to a lesser extent, short-term investments is subject to credit risk. We define this risk as the potential loss in fair value resulting from adverse changes in the borrower’s ability to repay its debt to us. We manage this risk by performing an analysis of prospective investments and through regular reviews of our portfolio by our investment personnel. We also limit the amount of our total investment portfolio that we invest in any one security. Our insurance subsidiaries provide property and liability insurance coverages through independent insurance agencies located throughout their operating areas. Our insurance subsidiaries bill the majority of this business directly to their policyholders, although our insurance subsidiaries bill a portion of their commercial business through their agents, to whom they extend credit in the normal course of business. Our insurance subsidiaries have reinsurance agreements with Donegal Mutual and with a number of major unaffiliated reinsurers. Reinsurance Accounting and Reporting Our insurance subsidiaries rely upon reinsurance agreements to limit their maximum net loss from large single risks or risks in concentrated areas and to increase their capacity to write insurance. Reinsurance does not relieve our insurance subsidiaries from liability to their respective policyholders. To the extent that a reinsurer cannot pay losses for which it is liable under the terms of a reinsurance agreement with one or more of our insurance subsidiaries, our insurance subsidiaries retain continued liability for such losses. However, in an effort to reduce the risk of non-payment, A- A- - Stock-Based Compensation We measure all share-based payments to our directors and the directors and employees of our subsidiaries and affiliates, including grants of stock options, using a fair-value-based method and record such expense in our results of operations. In determining the expense we record for stock options we grant to our directors and the directors and employees of our subsidiaries and affiliates, we estimate the fair value of each option award on the date of grant using the Black-Scholes option pricing model. The significant assumptions we utilize in applying the Black-Scholes option pricing model are the risk-free interest rate, expected term, dividend yield and expected volatility. In 2020, 2019 and 2018, we realized $302,901, $64,765 and $25,938, respectively, in tax benefits upon the exercise of stock options. Earnings Per Share We calculate basic earnings per share by dividing net income by the weighted-average number of common shares outstanding for the period. Diluted earnings per share reflects the dilution that could occur if securities or other contracts to issue common stock were exercised or converted into common stock. We have two classes of common stock, which we refer to as Class A common stock and Class B common stock. Our Class A common stock is entitled to the declaration and payment of cash dividends that are at least 10% higher than those we declare and pay on our Class B common stock. Accordingly, we use the two-class method for the computation of earnings per common share. The two-class method Goodwill and Other Intangible Assets Goodwill represents the excess of the purchase price over the underlying fair value of acquired entities. When completing acquisitions, we seek also to identify separately identifiable intangible assets that we have acquired. We assess goodwill and intangible assets with an indefinite useful life for impairment annually. We also assess goodwill and other intangible assets for impairment upon the occurrence of certain events. In making our assessment, we consider a number of factors including operating results, business plans, economic projections, anticipated future cash flows and current market data. Inherent uncertainties exist with respect to these factors and to our judgment in applying them when we make our assessment. Impairment of goodwill and other intangible assets could result from changes in economic and operating conditions in future periods.

Impact of New Accounting Standa

Impact of New Accounting Standards	12 Months Ended
	Dec. 31, 2020
Accounting Changes and Error Corrections [Abstract]
Impact of New Accounting Standards	2 - Impact of New Accounting Standards In February 2016, the FASB issued guidance that requires lessees to recognize leases, including operating leases, on the lessee’s balance sheet, unless a lease is considered a short-term lease. This guidance also requires entities to make new judgments to identify leases. The guidance was effective for annual and interim reporting periods beginning after December 15, 2018 and permitted early adoption. Our adoption of this guidance on January 1, 2019 did not have a significant impact on our financial position, results of operations or cash flows. In January 2017, the FASB issued guidance that simplifies the measurement of goodwill by modifying the goodwill impairment test previous guidance required. The guidance requires an entity to perform its annual or interim goodwill impairment test by comparing the fair value of a reporting unit with its carrying amount and recognize impairment for the amount by which the reporting unit’s carrying amount exceeds its fair value. The guidance was effective for annual and interim reporting periods beginning after December 15, 2019 and permitted early adoption. We early adopted this guidance in 2019. The adoption of this guidance did not have a significant impact on our financial position, results of operations or cash flows. In August 2018, the FASB issued guidance that modifies disclosure requirements related to fair value measurements. The guidance removes the requirements to disclose the amounts of, and reasons for, transfers between Level 1 and Level 2 of the fair value hierarchy. The guidance was effective for annual and interim reporting periods beginning after December 15, 2019 and permitted early adoption. We early adopted this guidance in 2019. The adoption of this guidance on January 1, 2019 did not have a significant impact on our financial position, results of operations or cash flows. In September 2016, the FASB issued guidance that amends previous guidance on the impairment of financial instruments by adding an impairment model that requires an entity to recognize expected credit losses as an allowance rather than impairments as credit losses are incurred. The intent of this guidance is to reduce complexity and result in a more timely recognition of expected credit losses. In November 2019, the FASB issued guidance that delays the effective date for “smaller reporting companies,” as defined in Item 10(f)(1) of Regulation S-K, to In December 2019, the FASB issued guidance that simplifies accounting for income taxes. The guidance eliminates certain exceptions related to the approach for intra-period tax allocation, the methodology for calculating income taxes in an interim period and the recognition of deferred tax liabilities for outside basis differences. The guidance was effective January 1, 2021, using the retrospective method or modified retrospective method for certain changes and the prospective method for all other changes, and permits early adoption. We do not expect our adoption of this guidance in 2021 to have a significant impact on our financial position, results of operations or cash flows.

Transactions with Affiliates

Transactions with Affiliates	12 Months Ended
	Dec. 31, 2020
Text Block [Abstract]
Transactions with Affiliates	3 - Transactions with Affiliates Our insurance subsidiaries conduct business and have various agreements with Donegal Mutual that we describe in the following subparagraphs: a. Reinsurance Pooling and Other Reinsurance Arrangements Atlantic States, our largest insurance subsidiary, and Donegal Mutual have a pooling agreement under which both companies contribute substantially all of their direct written business to the pool and receive an allocated percentage of the pooled underwriting results, excluding certain reinsurance Donegal Mutual assumes from our insurance subsidiaries. In addition, Donegal Mutual has a 100% quota-share reinsurance agreement with Southern Mutual Insurance Company, or Southern Mutual, and Donegal Mutual places its assumed business from Southern Mutual into the underwriting pool. Atlantic States has an 80% share of the results of the pool, and Donegal Mutual has a 20% share of the results of the pool. The intent of the pooling agreement is to produce more uniform and stable underwriting results from year to year for each pool participant than they would experience individually and to spread the risk of loss between the participants based on each participant’s relative amount of surplus and relative access to capital. Each participant in the pool has at its disposal the capacity of the entire pool, rather than being limited to policy exposures of a size commensurate with its own capital and surplus. The following amounts represent reinsurance Atlantic States ceded to the pool during 2020, 2019 and 2018: 2020 2019 2018 Premiums earned $ 266,400,636 $ 218,642,984 $ 212,928,238 Losses and loss expenses 181,205,743 173,238,503 159,495,489 Prepaid reinsurance premiums 146,387,565 116,189,929 106,224,424 Liability for losses and loss expenses 232,540,607 183,326,589 158,081,925 The following amounts represent reinsurance Atlantic States assumed from the pool during 2020, 2019 and 2018: 2020 2019 2018 Premiums earned $ 514,172,448 $ 479,835,362 $ 473,512,781 Losses and loss expenses 309,315,497 309,852,141 335,789,280 Unearned premiums 262,004,199 237,106,338 231,958,181 Liability for losses and loss expenses 377,530,215 322,658,731 303,546,744 Donegal Mutual and MICO have a quota-share reinsurance agreement under which Donegal Mutual assumes 25% of the premiums and losses related to the business of MICO. Donegal Mutual and Peninsula have a quota-share reinsurance agreement under which Donegal Mutual assumes 100% of the premiums and losses related to the workers’ compensation product line of Peninsula in certain states. Donegal Mutual places its assumed business from MICO and Peninsula into the underwriting pool. The following amounts represent reinsurance ceded to Donegal Mutual pursuant to these quota-share reinsurance agreements during 2020, 2019 and 2018: 2020 2019 2018 Premiums earned $ 39,315,398 $ 42,079,112 $ 42,813,929 Losses and loss expenses 15,471,037 19,617,787 23,175,456 Prepaid reinsurance premiums 17,155,909 19,217,849 19,047,084 Liability for losses and loss expenses 35,306,627 36,597,834 38,434,078 In 2019 and 2020, each of our insurance subsidiaries had a catastrophe reinsurance agreement with Donegal Mutual that provided coverage under any one catastrophic occurrence above a set retention of $2,000,000, with a combined retention of $5,000,000 for a catastrophe involving a combination of our insurance subsidiaries, up to the amount Donegal Mutual and our insurance subsidiaries retained under catastrophe reinsurance agreements with unaffiliated reinsurers. Through December 31, 2018, Atlantic States, Southern and Le Mars each had a catastrophe reinsurance agreement with Donegal Mutual that provided coverage under any one catastrophic occurrence above a set retention ($2,500,000, $2,000,000 and $1,000,000 for Atlantic States, Southern and Le Mars, respectively, for 2018), with a combined retention of $5,000,000 for a catastrophe involving a combination of these subsidiaries, up to the amount Donegal Mutual and our insurance subsidiaries retained under catastrophe reinsurance agreements with unaffiliated reinsurers. Through December 31, 2018, Donegal Mutual and Southern had an excess of loss reinsurance agreement in which Donegal Mutual assumed up to $500,000 of Southern’s losses in excess of $500,000. The following amounts represent reinsurance that our insurance subsidiaries ceded to Donegal Mutual pursuant to these reinsurance agreements during 2020, 2019 and 2018: 2020 2019 2018 Premiums earned $ 15,595,138 $ 14,404,636 $ 19,190,067 Losses and loss expenses 25,259,527 13,769,736 12,899,927 Liability for losses and loss expenses 3,812,339 3,149,907 4,847,176 The following amounts represent the effect of affiliated reinsurance transactions on net premiums our insurance subsidiaries earned during 2020, 2019 and 2018: 2020 2019 2018 Assumed $ 514,172,448 $ 479,835,362 $ 473,512,781 Ceded (321,311,172 ) (275,126,732 ) (274,932,234 ) Net $ 192,861,276 $ 204,708,630 $ 198,580,547 The following amounts represent the effect of affiliated reinsurance transactions on net losses and loss expenses our insurance subsidiaries incurred during 2020, 2019 and 2018: 2020 2019 2018 Assumed $ 309,311,098 $ 309,844,705 $ 335,684,463 Ceded (221,936,307 ) (206,626,026 ) (195,570,872 ) Net $ 87,374,791 $ 103,218,679 $ 140,113,591 b. Expense Sharing Donegal Mutual provides facilities, management and other services to us and our insurance subsidiaries. In addition, Donegal Mutual purchases and maintains the information technology systems that support the business of Donegal Mutual and our insurance subsidiaries. Donegal Mutual allocates certain related expenses to Atlantic States in relation to the relative participation of Atlantic States and Donegal Mutual in the pooling agreement. Our insurance subsidiaries other than Atlantic States reimburse Donegal Mutual for direct costs of services Donegal Mutual provides on their behalf and a proportionate share of certain costs Donegal Mutual allocates to them based on their percentage of the total net premiums written of the Donegal Insurance Group and other metrics. Donegal Mutual allocates costs related to its development and maintenance of information technology systems over the estimated useful life of those systems (generally five years) and charges a proportionate share of those costs to our insurance companies based on their percentage of the total net premiums written of the Donegal Insurance Group. Total charges from Donegal Mutual for services it provided to our insurance subsidiaries totaled Donegal Mutual is currently in the midst of a multi-year effort to modernize certain of its key technology infrastructure and application systems. In 2020, Donegal Mutual placed the first release of new systems into service and allocated $2.8 million of related costs to our insurance subsidiaries. Donegal Mutual will allocate to our insurance subsidiaries their proportionate share of the remaining $19.2 million of its costs for the first release over the next five years. Donegal Mutual incurred an additional $9.0 million of deferred costs related to releases under development that were not yet ready for their intended use at December 31, 2020. Our management believes that the allocation methods Donegal Mutual utilizes are reasonable. In addition, Donegal Mutual and we maintain a coordinating committee that consists of two members of our board of directors, neither of whom is a member of Donegal Mutual’s board of directors, and two members of Donegal Mutual’s board of directors, neither of whom is a member of our board of directors. The purpose of the coordinating committee is to maintain a process for an ongoing evaluation of the fairness of the terms of all transactions between Donegal Mutual and our insurance subsidiaries. c. Lease Agreement We lease office equipment with terms ranging from 3 to 10 years to Donegal Mutual under a 10-year

Investments

Investments	12 Months Ended
	Dec. 31, 2020
Investments, Debt and Equity Securities [Abstract]
Investments	4 - Investments The amortized cost and estimated fair values of our fixed maturities at December 31, 2020 and 2019 are as follows: 2020 Held to Maturity Amortized Cost Gross Gross Estimated Fair U.S. Treasury securities and obligations of U.S. government corporations and agencies $ 77,435,268 $ 3,983,890 $ 223,564 $ 81,195,594 Obligations of states and political subdivisions 312,319,238 23,211,483 142,750 335,387,971 Corporate securities 173,269,560 18,172,244 205,761 191,236,043 Mortgage-backed securities 23,585,373 1,235,840 — 24,821,213 Totals $ 586,609,439 $ 46,603,457 $ 572,075 $ 632,640,821 2020 Available for Sale Amortized Cost Gross Gross Estimated Fair U.S. Treasury securities and obligations of U.S. government corporations and agencies $ 47,511,872 $ 423,855 $ 121,015 $ 47,814,712 Obligations of states and political subdivisions 66,286,667 2,690,335 11,765 68,965,237 Corporate securities 202,396,309 10,496,218 184,464 212,708,063 Mortgage-backed securities 218,763,252 6,901,676 16,923 225,648,005 Totals $ 534,958,100 $ 20,512,084 $ 334,167 $ 555,136,017 2019 Held to Maturity Amortized Cost Gross Gross Estimated Fair U.S. Treasury securities and obligations of U.S. government corporations and agencies $ 82,916,052 $ 1,803,230 $ 68,560 $ 84,650,722 Obligations of states and political subdivisions 204,634,486 14,236,736 288,174 218,583,048 Corporate securities 156,398,001 8,274,912 333,166 164,339,747 Mortgage-backed securities 32,145,243 611,641 16,057 32,740,827 Totals $ 476,093,782 $ 24,926,519 $ 705,957 $ 500,314,344 2019 Available for Sale Amortized Cost Gross Gross Estimated Fair U.S. Treasury securities and obligations of U.S. government corporations and agencies $ 19,302,056 $ 81,773 $ 19,370 $ 19,364,459 Obligations of states and political subdivisions 55,162,046 1,641,171 6,929 56,796,288 Corporate securities 154,946,586 4,477,035 180,312 159,243,309 Mortgage-backed securities 327,428,590 2,856,820 737,663 329,547,747 Totals $ 556,839,278 $ 9,056,799 $ 944,274 $ 564,951,803 At December 31, 2020, our holdings of obligations of states and political subdivisions included general obligation bonds with an aggregate fair value of $263.6 million and an amortized cost of $247.5 million. Our holdings also included special revenue bonds with an aggregate fair value of $140.8 million and an amortized cost of $131.1 million. With respect to both categories of bonds, we held no securities of any issuer that comprised more than 10% of that category at December 31, 2020. Education bonds and water and sewer utility bonds represented 44% and 39%, respectively, of our total investments in special revenue bonds based on their carrying values at December 31, 2020. Many of the issuers of the special revenue bonds we held at December 31, 2020 have the authority to impose ad valorem taxes. In that respect, many of the special revenue bonds we held are similar to general obligation bonds. At December 31, 2019, our holdings of obligations of states and political subdivisions included general obligation bonds with an aggregate fair value of $182.0 million and an amortized cost of $172.3 million. Our holdings also included special revenue bonds with an aggregate fair value of $93.4 million and an amortized cost of $87.5 million. With respect to both categories of bonds, we held no securities of any issuer that comprised more than 10% of that category at December 31, 2019. Education bonds and water and sewer utility bonds represented 44% and 35%, respectively, of our total investments in special revenue bonds based on their carrying values at December 31, 2019. Many of the issuers of the special revenue bonds we held at December 31, 2019 have the authority to impose ad valorem taxes. In that respect, many of the special revenue bonds we held are similar to general obligation bonds. We have segregated within accumulated other comprehensive income the net unrealized losses of $15.1 million arising prior to the November 30, 2013 reclassification date for fixed maturities reclassified from available for sale to held to maturity. We are amortizing this balance over the remaining We set forth below the amortized cost and estimated fair value of fixed maturities at December 31, 2020 by contractual maturity. Expected maturities may differ from contractual maturities because borrowers may have the right to call or prepay obligations with or without call or prepayment penalties. Amortized Cost Estimated Fair Held to maturity Due in one year or less $ 17,487,922 $ 17,751,370 Due after one year through five years 91,293,064 97,632,535 Due after five years through ten years 205,058,526 222,703,673 Due after ten years 249,184,554 269,732,030 Mortgage-backed securities 23,585,373 24,821,213 Total held to maturity $ 586,609,439 $ 632,640,821 Available for sale Due in one year or less $ 55,448,556 $ 55,677,592 Due after one year through five years 99,633,832 105,770,506 Due after five years through ten years 130,984,165 136,888,915 Due after ten years 30,128,295 31,150,999 Mortgage-backed securities 218,763,252 225,648,005 Total available for sale $ 534,958,100 $ 555,136,017 The cost and estimated fair values of our equity securities at December 31, 2020 were as follows: Cost Gross Gains Gross Estimated Equity securities $ 42,409,750 $ 17,103,055 $ 956,632 $ 58,556,173 The cost and estimated fair values of our equity securities at December 31, 2019 were as follows: Cost Gross Gains Gross Estimated Fair Equity securities $ 43,419,136 $ 12,179,912 $ 121,492 $ 55,477,556 The amortized cost of fixed maturities on deposit with various regulatory authorities at December 31, 2020 and 2019 amounted to $9,114,791 and $8,330,651, respectively. We derived net investment income, consisting primarily of interest and dividends, from the following sources: 2020 2019 2018 Fixed maturities $ 30,750,231 $ 29,969,774 $ 27,733,555 Equity securities 1,386,343 1,268,056 1,264,120 Short-term investments 427,392 1,243,104 795,522 Other 29,250 29,251 29,450 Investment income 32,593,216 32,510,185 29,822,647 Investment expenses (3,088,750 ) (2,995,230 ) (2,914,991 ) Net investment income $29,504,466 $29,514,955 $ 26,907,656 We present below gross gains and losses from investments, including those we classified as held to maturity, and the change in the difference between fair value and cost of investments: 2020 2019 2018 Gross gains: Fixed maturities $ 818,350 $ 470,983 $ 131,660 Equity securities 8,532,881 10,471,285 1,890,762 Investment in affiliate — 12,662,147 9,351,231 23,604,415 2,022,422 Gross losses: Fixed maturities 246,243 323,746 630,904 Equity securities 6,327,069 1,296,052 6,193,027 6,573,312 1,619,798 6,823,931 Net investment gains (losses) $ 2,777,919 $ 21,984,617 $ (4,801,509 ) Change in difference between fair value and cost of Fixed maturities $ 33,876,212 $ 38,647,456 $ (20,641,433 ) Equity securities 4,088,003 9,334,127 (3,501,853 ) Totals $ 37,964,215 $ 47,981,583 $ (24,143,286 ) We recognized $8.4 million of unrealized gains and $2.8 million of unrealized losses on equity securities held at December 31, 2020 in net investment gains for 2020.We recognized $8.9 million of unrealized gains and $25,751 of unrealized losses on equity securities held at December 31, 2019 in net investment gains for 2019. We held fixed maturities with unrealized losses representing declines that we considered temporary at December 31, 2020 as follows: Less than 12 months 12 months or longer Fair Value Unrealized Fair Value Unrealized U.S. Treasury securities and obligations of U.S. government corporations and $ 29,144,224 $ 344,579 $ — $ — Obligations of states and political subdivisions 9,361,435 154,515 — — Corporate securities 26,142,933 114,606 8,229,646 275,619 Mortgage-backed securities 3,091,272 15,425 236,560 1,498 Totals $ 67,739,864 $ 629,125 $ 8,466,206 $ 277,117 We held fixed maturities with unrealized losses representing declines that we considered temporary at December 31, 2019 as follows: Less than 12 months 12 months or longer Fair Value Unrealized Fair Value Unrealized U.S. Treasury securities and obligations of U.S. government corporations and $ 7,461,245 $ 45,688 $ 5,394,735 $ 42,242 Obligations of states and political subdivisions 23,339,340 293,516 2,326,813 1,587 Corporate securities 19,362,346 263,280 18,803,546 250,198 Mortgage-backed securities 28,507,123 55,729 74,088,769 697,991 Totals $ 78,670,054 $ 658,213 $ 100,613,863 $ 992,018 We make estimates concerning the valuation of our investments and the recognition of other-than-temporary declines in the value of our investments. For equity securities, we measure investments at fair value, and we recognize changes in fair value in our results of operations. With respect to a debt security that is in an unrealized loss position, we first assess if we intend to sell the debt security. If we determine we intend to sell the debt security, we recognize the impairment loss in our results of operations. If we do not intend to sell the debt security, we determine whether it is more likely than not that we will be required to sell the debt security prior to recovery. If we determine it is more likely than not that we will be required to sell the debt security prior to recovery, we recognize an impairment loss in our results of operations. If we determine it is more likely than not that we will not be required to sell the debt security prior to recovery, we then evaluate whether a credit loss has occurred. We determine whether a credit loss has occurred by comparing the amortized cost of the debt security to the present value of the cash flows we expect to collect. If we expect a cash flow shortfall, we consider that a credit loss has occurred. If we determine that a credit loss has occurred, we consider the impairment to be other than temporary. We then recognize the amount of the impairment loss related to the credit loss in our results of operations, and we recognize the remaining portion of the impairment loss in our other comprehensive income, net of applicable taxes. In addition, we may write down securities in an unrealized loss position based on a number of other factors, including when the fair value of an investment is significantly below its cost, when the financial condition of the issuer of a security has deteriorated, the occurrence of industry, company or geographic events that have negatively impacted the value of a security and rating agency downgrades. We held 43 debt securities that were in an unrealized loss position at December 31, 2020. Based upon our analysis of general market conditions and underlying factors impacting these debt securities, we considered these declines in value to be temporary. We did not recognize any impairment losses in 2020, 2019 or 2018. We had no sales or transfers from our held to maturity portfolio in 2020, 2019 or 2018. We had no derivative instruments or hedging activities during 2020, 2019 or 2018.

Fair Value Measurements

Fair Value Measurements	12 Months Ended
	Dec. 31, 2020
Fair Value Disclosures [Abstract]
Fair Value Measurements	5 - Fair Value Measurements We account for financial assets using a framework that establishes a hierarchy that ranks the quality and reliability of inputs, or assumptions, used in the determination of fair value, and we classify financial assets and liabilities carried at fair value in one of the following three categories: Level 1 - quoted prices in active markets for identical assets and liabilities; Level 2 - directly or indirectly observable inputs other than Level 1 quoted prices; and Level 3 - unobservable inputs not corroborated by market data. For investments that have quoted market prices in active markets, we use the quoted market price as fair value and include these investments in Level 1 of the fair value hierarchy. We classify publicly traded equity securities as Level 1. When quoted market prices in active markets are not available, we base fair values on quoted market prices of comparable instruments or price estimates we obtain from independent pricing services. We classify our fixed maturity investments as Level 2. Our fixed maturity investments consist of U.S. Treasury securities and obligations of U.S. government corporations and agencies, obligations of states and political subdivisions, corporate securities and mortgage-backed securities. We present our investments in available-for-sale that the estimated fair value does not reflect the price at which an actual transaction would occur. We utilize nationally recognized independent pricing services to estimate fair values or obtain market quotations for substantially all of our fixed maturity and equity investments. We generally obtain prices per security. The pricing services utilize market quotations for fixed maturity and equity securities that have quoted prices in active markets. For fixed maturity securities that generally do not trade on a daily basis, the pricing services prepare estimates of fair value measurements based predominantly on observable market inputs. The pricing services do not use broker quotes in determining the fair values of our investments. Our investment personnel review the estimates of fair value the pricing services provide to determine if the estimates we obtain are representative of fair values based upon the general knowledge of the market of our investment personnel, their research findings related to unusual fluctuations in value and their comparison of such values to execution prices for similar securities. Our investment personnel monitor the market and are familiar with current trading ranges for similar securities and pricing of specific investments. Our investment personnel review all pricing estimates that we receive from the pricing services against their expectations with respect to pricing based on fair market curves, security ratings, coupon rates, security type and recent trading activity. Our investment personnel review documentation with respect to the pricing services’ pricing methodology that they obtain periodically to determine if the primary pricing sources, market inputs and pricing frequency for various security types are reasonable. At December 31, 2020, we received two estimates per security from the pricing services, and we priced substantially all of our Level 1 and Level 2 investments using those prices. In our review of the estimates the pricing services provided at December 31, 2020, we did not identify any material discrepancies, and we did not make any adjustments to the estimates the pricing services provided. We present our cash and short-term investments at estimated fair value. The carrying values in our balance sheet for premium receivables and reinsurance receivables and payables for premiums and paid losses and loss expenses approximate their fair values. The carrying amounts reported in the balance sheet for our subordinated debentures and borrowings under lines of credit approximate their fair values. We classify these items as Level 3. We evaluate our assets and liabilities on a regular basis to determine the appropriate level at which to classify them for each reporting period. Based on our review of the methodology and summary of inputs the pricing services use, we have concluded that our Level 1 and Level 2 investments were classified properly at December 31, 2020 and 2019. The following table presents our fair value measurements for our investments in available-for-sale Fair Value Measurements Using Fair Value Quoted Prices in Significant Significant (in thousands) U.S. Treasury securities and obligations of U.S. government corporations and agencies $ 47,814,712 $ — $ 47,814,712 $ — Obligations of states and political subdivisions 68,965,237 — 68,965,237 — Corporate securities 212,708,063 — 212,708,063 — Mortgage-backed securities 225,648,005 — 225,648,005 — Equity securities 58,556,173 54,152,085 4,404,088 — Total investments in the fair value hierarchy $ 613,692,190 $ 54,152,085 $ 559,540,105 $ — The following table presents our fair value measurements for our investments in available-for-sale Fair Value Measurements Using Fair Value Quoted Prices Active for Significant Significant (in thousands) U.S. Treasury securities and obligations of U.S. government corporations and agencies $ 19,364,459 $ — $ 19,364,459 $ — Obligations of states and political subdivisions 56,796,288 — 56,796,288 — Corporate securities 159,243,309 — 159,243,309 — Mortgage-backed securities 329,547,747 — 329,547,747 — Equity securities 55,477,556 53,124,368 2,353,188 — Total investments in the fair value hierarchy $ 620,429,359 $ 53,124,368 $ 567,304,991 $ —

Deferred Policy Acquisition Cos

Deferred Policy Acquisition Costs	12 Months Ended
	Dec. 31, 2020
Insurance [Abstract]
Deferred Policy Acquisition Costs	6 - Deferred Policy Acquisition Costs Changes in our insurance subsidiaries’ deferred policy acquisition costs are as follows: 2020 2019 2018 Balance, January 1 $ 59,284,859 $ 60,615,127 $ 60,289,860 Acquisition costs deferred 118,944,099 121,112,732 121,289,267 Amortization charged to earnings (119,072,000 ) (122,443,000 ) (120,964,000 ) Balance, December 31 $ 59,156,958 $ 59,284,859 $ 60,615,127

Property and Equipment

Property and Equipment	12 Months Ended
	Dec. 31, 2020
Property, Plant and Equipment [Abstract]
Property and Equipment	7 - Property and Equipment Property and equipment at December 31, 2020 and 2019 consisted of the following: 2020 2019 Estimated Useful Office equipment $ 8,809,344 $ 8,660,163 3-15 years Automobiles 301,119 301,119 5 years Real estate 4,921,056 4,977,813 5 50 Software 2,065,927 2,065,927 5 years 16,097,446 16,005,022 Accumulated depreciation (11,707,069 ) (11,446,950 ) $ 4,390,377 $ 4,558,072 Depreciation expense for 2020, 2019 and 2018 amounted to $

Liability for Losses and Loss E

Liability for Losses and Loss Expenses	12 Months Ended
	Dec. 31, 2020
Text Block [Abstract]
Liability for Losses and Loss Expenses	8 - Liability for Losses and Loss Expenses The establishment of an appropriate liability for losses and loss expenses is an inherently uncertain process, and we can provide no assurance that our insurance subsidiaries’ ultimate liability will not exceed their loss and loss expense reserves and have an adverse effect on our results of operations and financial condition. For example, legislative, judicial and regulatory actions may expand coverage definitions, retroactively mandate coverage or otherwise require our insurance subsidiaries to pay losses for damages that their policies explicitly excluded or did not intend to cover. Furthermore, we cannot predict the timing, frequency and extent of adjustments to our insurance subsidiaries’ estimated future liabilities, because the historical conditions and events that serve as a basis for our insurance subsidiaries’ estimates of ultimate claim costs may change. As is the case for substantially all property and casualty insurance companies, our insurance subsidiaries have found it necessary in the past to increase their estimated future liabilities for losses and loss expenses in certain periods, and, in other periods, their estimates have exceeded their actual liabilities. Changes in our insurance subsidiaries’ estimate of their liability for losses and loss expenses generally reflect actual payments and their evaluation of information received since the prior reporting date. We summarize activity in our insurance subsidiaries’ liability for losses and loss expenses as follows: 2020 2019 2018 Balance at January 1 $ 869,673,849 $ 814,665,224 $ 676,671,727 Less reinsurance recoverable (362,768,427 ) (339,267,525 ) (293,271,257 ) Net balance at January 1 506,905,422 475,397,699 383,400,470 Incurred related to: Current year 472,709,060 519,319,941 540,826,810 Prior years (12,944,767 ) (12,932,277 ) 35,631,610 Total incurred 459,764,293 506,387,664 576,458,420 Paid related to: Current year 236,984,291 278,923,614 308,578,285 Prior years 172,496,467 195,956,327 175,882,906 Total paid 409,480,758 474,879,941 484,461,191 Net balance at December 31 557,188,957 506,905,422 475,397,699 Plus reinsurance recoverable 404,818,480 362,768,427 339,267,525 Balance at December 31 $ 962,007,437 $ 869,673,849 $ 814,665,224 Our insurance subsidiaries recognized a decrease in their liability for losses and loss expenses of prior years of million in each of 2020 and 2019. Our insurance subsidiaries recognized an increase in their liability for losses and loss expenses of prior years of million in 2018. Our insurance subsidiaries made no significant changes in their reserving philosophy or claims management personnel conclude that their prior actuarial assumptions did not fully anticipate recent changes in severity and reporting trends. Our insurance subsidiaries have encountered increasing difficulties in projecting the ultimate severity of automobile losses over recent accident years, which our insurance subsidiaries attribute to worsening litigation trends and an increased delay in the reporting to our insurance subsidiaries of information with respect to the severity of claims. As a result, our insurance subsidiaries’ actuaries increased their projections of the ultimate cost of our insurance subsidiaries’ prior-year personal automobile and commercial automobile losses, and our insurance subsidiaries added $17.7 million to their reserves for personal automobile and $20.8 million to their reserves for commercial automobile for accident years prior to 2018. Short-duration contracts are contracts for which our insurance subsidiaries receive premiums that they recognize as revenue over the period of the contract in proportion to the amount of insurance protection our insurance subsidiaries provide. Our insurance subsidiaries consider the policies they issue to be short-duration contracts. We consider our insurance subsidiaries’ material lines of business to be personal automobile, homeowners, commercial automobile, commercial multi-peril and workers’ compensation. Our insurance subsidiaries determine incurred but not reported (“IBNR”) reserves by subtracting the cumulative loss and loss expense amounts our insurance subsidiaries have paid and the case reserves our insurance subsidiaries have established at the balance sheet date from their actuaries’ estimate of the ultimate cost of losses and loss expenses. Accordingly, our insurance subsidiaries’ IBNR reserves include their actuaries’ projections of the cost of unreported claims as well as their actuaries’ projected development of case reserves on known claims and reopened claims. Our insurance subsidiaries’ methodology for estimating IBNR reserves has been in place for many years, and their actuaries made no significant changes to that methodology during 2020. The actuaries for our insurance subsidiaries generally prepare an initial estimate for ultimate losses and loss expenses for the current accident year by multiplying earned premium by an expected loss ratio for each line of business our insurance subsidiaries write. Expected loss ratios represent the actuaries’ expectation of losses at the time our insurance subsidiaries price and write their policies, before the emergence of any actual claims experience. The actuaries determine an expected loss ratio by analyzing historical experience and adjusting for loss cost trends, loss frequency and severity trends, premium rate level changes, reported and paid loss emergence patterns and other known or observed factors. The actuaries use a variety of actuarial methods to estimate the ultimate cost of losses and loss expenses. These methods include paid loss development, incurred loss development and the Bornhuetter-Ferguson method. The actuaries base their selection of a point estimate on a judgmental weighting of estimates each of these methods produce. The actuaries consider loss frequency and severity trends when they develop expected loss ratios and point estimates. Loss frequency is a measure of the number of claims per unit of insured exposure, and loss severity is a measure of the average size of claims. Factors that affect loss frequency include changes in weather patterns or economic activity. Factors that affect loss severity include changes in policy limits, reinsurance retentions, inflation rates and judicial interpretations. Our insurance subsidiaries create a claim file when they receive notice of an actual demand for payment, an event that may lead to a demand for payment or when they otherwise determine that a demand for payment could potentially lead to a future demand for payment on another coverage under the same policy or another policy they have issued. In recent years, our insurance subsidiaries have noted an increase in the period of time between the occurrence of a casualty loss event and the date on which they receive notice of a liability claim. Changes in the length of time between the loss occurrence date and the claim reporting date affect the actuaries’ ability to accurately predict loss frequency and the amount of IBNR reserves our insurance subsidiaries require. Our insurance subsidiaries generally create a claim file for a policy at the claimant level by type of coverage and generally recognize one count for each claim event. In certain lines of business where it is common for multiple parties to claim damages arising from a single claim event, our insurance subsidiaries recognize one count for each claimant involved in the event. Atlantic States recognizes one count for each claim event, or claimant involved in a multiple-party claim event, related to losses Atlantic States assumes through its participation in its pooling agreement with Donegal Mutual. Our insurance subsidiaries accumulate the claim counts and report them by line of business. For purposes of the claim development tables we present below, our insurance subsidiaries count claims on policies they issue even if they eventually close such claims without making a loss payment. Claims our insurance subsidiaries close without making a loss payment typically generate loss expenses. The methods our insurance subsidiaries have used to summarize claim counts have not changed significantly over the time periods we report in the tables below. The following tables present information about incurred and paid claims development as of December 31, 2020, net of reinsurance, as well as cumulative claim frequency and the total of IBNR reserves plus expected development on reported claims that our insurance subsidiaries included within their net incurred claims amounts. The tables include unaudited information about incurred and paid claims development for the years ended December 31, 2011 through 2019, which we present as supplementary information.​​​​​​​ Personal At December 31, 2020 Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance For the Year Ended December 31, Accident 2011 2012 2013 2014 2015 2016 2017 2018 2019 2020 Total IBNR Cumulative Unaudited (dollars and reported claims in thousands) 2011 $ 127,929 $ 131,678 $ 132,987 $ 133,229 $ 133,617 $ 133,218 $ 133,145 $ 133,142 $ 133,207 $ 133,192 $ 69 75 2012 130,415 133,201 135,592 136,493 136,552 136,463 136,141 136,677 136,648 194 69 2013 124,965 130,737 131,594 132,643 132,604 132,934 132,853 132,690 136 66 2014 124,426 124,806 124,210 126,200 126,779 126,734 126,861 219 71 2015 137,569 139,333 139,181 142,493 142,408 142,073 499 70 2016 150,216 153,937 157,516 157,943 156,935 1,349 73 2017 166,690 176,728 175,939 174,784 2,567 79 2018 186,580 183,358 181,558 5,837 81 2019 161,056 157,689 10,276 68 2020 111,483 25,587 42 Total $ 1,453,913 Personal Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance For the Year Ended December 31, Accident Year 2011 2012 2013 2014 2015 2016 2017 2018 2019 2020 Unaudited (in thousands) 2011 $ 87,191 $ 110,249 $ 121,621 $ 127,545 $ 131,319 $ 132,479 $ 132,714 $ 132,777 $ 132,835 $ 133,002 2012 87,517 111,941 124,652 130,862 133,428 134,581 135,132 136,137 136,165 2013 84,241 109,051 120,118 125,946 130,026 131,326 131,642 132,215 2014 85,377 104,736 114,893 120,491 123,815 124,926 125,619 2015 93,611 116,303 128,395 135,027 139,121 140,028 2016 102,433 129,507 143,321 151,159 153,521 2017 111,964 142,372 159,879 166,099 2018 115,585 150,175 163,036 2019 103,101 127,187 2020 66,084 Total 1,342,956 All outstanding liabilities before 2011, net of reinsurance 647 Liabilities for claims and claims adjustment expenses, net of reinsurance $ 111,604 Homeowners At December 31, 2020 Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance For the Year Ended December 31, Accident 2011 2012 2013 2014 2015 2016 2017 2018 2019 2020 Total IBNR Cumulative Unaudited (dollars and reported claims in thousands) 2011 $ 71,256 $ 70,461 $ 70,436 $ 70,381 $ 70,297 $ 70,351 $ 70,479 $ 70,642 $ 70,682 $ 70,689 $ — 26 2012 53,962 54,794 54,468 54,351 54,281 54,381 54,523 54,557 54,548 — 18 2013 50,887 51,121 51,122 50,874 50,988 50,971 51,008 51,064 — 12 2014 56,916 58,378 57,680 57,332 57,288 57,402 57,367 — 17 2015 63,359 63,925 63,053 63,071 63,099 62,993 28 13 2016 62,443 64,064 63,735 63,355 63,279 25 12 2017 79,283 79,911 79,305 79,247 342 17 2018 81,965 83,385 82,905 838 19 2019 73,294 73,554 1,830 15 2020 61,633 6,235 12 Total $ 657,279 Homeowners Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance Accident 2011 2012 2013 2014 2015 2016 2017 2018 2019 2020 Unaudited (in thousands) 2011 $ 57,588 $ 69,345 $ 70,125 $ 70,351 $ 70,541 $ 70,626 $ 70,648 $ 70,692 $ 70,692 $ 70,693 2012 46,566 53,619 54,028 54,298 54,317 54,356 54,557 54,557 54,553 2013 40,949 49,410 50,210 50,478 51,043 50,902 50,967 50,965 2014 45,823 56,255 56,990 57,195 56,995 57,243 57,336 2015 51,885 61,542 62,204 62,590 62,844 62,943 2016 50,125 61,145 62,760 63,144 63,162 2017 67,077 77,663 78,006 78,127 2018 70,385 79,892 80,905 2019 58,074 69,145 2020 51,226 Total 639,055 All outstanding liabilities before 2011, net of reinsurance 99 Liabilities for claims and claims adjustment expenses, net of reinsurance $ 18,323 Commercial At December 31, 2020 Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance For the Year Ended December 31, Accident 2011 2012 2013 2014 2015 2016 2017 2018 2019 2020 Total IBNR Cumulative Unaudited (dollars and reported claims in thousands) 2011 $ 26,642 $ 27,157 $ 28,570 $ 28,893 $ 29,112 $ 29,107 $ 29,487 $ 29,751 $ 29,542 $ 29,493 $ 17 4 2012 26,557 27,720 30,606 31,435 31,278 31,648 31,803 31,896 31,930 27 8 2013 32,902 33,749 34,751 35,240 36,404 36,435 36,569 36,181 64 8 2014 42,760 44,544 47,326 48,213 49,284 49,168 49,308 192 11 2015 46,526 48,323 51,412 54,259 54,517 54,619 452 12 2016 54,302 57,353 65,905 67,127 66,894 861 13 2017 61,484 67,927 67,697 67,249 2,823 13 2018 79,307 81,396 82,313 5,254 15 2019 88,864 91,245 15,356 15 2020 90,367 32,130 13 Total $ 599,599 Commercial Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance Accident 2011 2012 2013 2014 2015 2016 2017 2018 2019 2020 Unaudited (in thousands) 2011 $ 13,876 $ 19,106 $ 24,267 $ 26,973 $ 28,014 $ 28,758 $ 28,836 $ 29,102 $ 29,474 $ 29,476 2012 13,642 20,240 23,718 27,417 29,873 30,402 31,104 31,228 31,263 2013 16,306 23,557 26,879 31,053 34,083 36,004 36,106 36,092 2014 22,707 31,089 39,436 44,374 47,290 48,418 48,603 2015 23,875 35,342 41,678 48,261 51,605 51,992 2016 27,033 38,237 48,837 57,237 60,485 2017 28,707 40,213 49,703 57,128 2018 33,862 47,941 57,451 2019 36,948 53,026 2020 31,884 Total 457,400 All outstanding liabilities before 2011, net of reinsurance 244 Liabilities for claims and claims adjustment expenses, net of reinsurance $ 142,443 Commercial At December 31, 2020 Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance For the Year Ended December 31, Accident 2011 2012 2013 2014 2015 2016 2017 2018 2019 2020 Total IBNR Cumulative Unaudited (dollars and reported claims in thousands) 2011 $ 33,054 $ 35,411 $ 35,942 $ 37,576 $ 37,385 $ 38,270 $ 38,105 $ 38,160 $ 38,434 $ 38,478 $ — 7 2012 29,789 30,716 32,449 34,117 35,755 36,214 36,525 36,876 36,662 — 6 2013 35,683 35,679 37,292 37,205 37,981 37,365 37,453 37,495 (1 ) 6 2014 48,204 50,135 51,843 52,336 53,294 53,116 52,926 119 7 2015 42,070 43,874 44,728 45,104 45,873 45,366 186 6 2016 43,005 46,988 48,267 48,871 48,732 857 6 2017 56,185 56,043 56,517 54,812 2,253 7 2018 66,265 66,470 67,749 6,243 7 2019 71,865 73,836 12,530 7 2020 83,195 26,981 7 Total $ 539,251 Commercial Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance Accident 2011 2012 2013 2014 2015 2016 2017 2018 2019 2020 Unaudited (in thousands) 2011 $ 18,773 $ 24,767 $ 30,286 $ 33,526 $ 36,722 $ 37,759 $ 38,240 $ 38,366 $ 38,413 $ 38,457 2012 16,666 23,384 26,634 29,370 33,327 35,331 35,909 36,329 36,399 2013 19,875 26,216 29,159 33,614 35,104 36,321 37,333 37,436 2014 27,920 35,520 40,936 47,021 50,017 51,615 52,103 2015 21,837 29,419 34,323 39,162 42,849 44,090 2016 19,660 29,402 34,612 41,193 43,435 2017 27,399 36,926 42,691 46,361 2018 30,597 42,296 48,050 2019 28,210 41,266 2020 34,729 Total 422,326 All outstanding liabilities before 2011, net of reinsurance 612 Liabilities for claims and claims adjustment expenses, net of $ 117,537 Workers’ At December 31, 2020 Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance For the Year Ended December 31, Accident 2011 2012 2013 2014 2015 2016 2017 2018 2019 2020 Total IBNR Cumulative Unaudited (dollars and reported claims in thousands) 2011 $ 32,490 $ 35,757 $ 36,614 $ 36,369 $ 35,670 $ 35,039 $ 35,194 $ 34,926 $ 35,034 $ 35,045 $ 27 5 2012 39,142 39,516 38,827 37,926 37,163 36,468 35,954 35,932 36,014 69 5 2013 46,325 47,027 44,289 42,828 42,327 42,555 42,651 42,341 116 6 2014 51,508 51,553 49,288 48,537 47,540 47,693 47,849 193 6 2015 53,332 49,615 45,991 44,986 43,006 42,597 548 5 2016 58,814 49,802 47,883 44,969 44,098 840 5 2017 60,450 56,351 52,687 51,464 2,742 5 2018 62,197 55,291 52,514 4,114 6 2019 60,998 59,624 7,825 6 2020 57,172 19,283 5 Total $ 468,718 Workers’ Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance For the Year Ended December 31, Accident 2011 2012 2013 2014 2015 2016 2017 2018 2019 2020 Unaudited (in thousands) 2011 $ 9,157 $ 21,450 $ 27,517 $ 31,905 $ 32,394 $ 33,067 $ 33,577 $ 33,963 $ 34,109 $ 34,261 2012 11,097 22,963 28,812 31,244 33,196 34,177 34,460 34,622 34,691 2013 13,052 26,043 32,783 36,351 38,877 39,617 40,361 40,827 2014 13,932 28,513 36,284 40,393 42,465 43,866 44,403 2015 13,071 27,531 34,192 36,929 37,936 38,596 2016 14,709 30,344 37,178 40,570 41,208 2017 15,581 31,990 39,684 42,954 2018 17,644 31,928 37,072 2019 16,939 33,009 2020 14,591 Total 361,612 All outstanding liabilities before 2011, net of reinsurance 3,343 Liabilities for claims and claims adjustment expenses, net of reinsurance $ 110,449 The following table presents a reconciliation of the net incurred and paid claims development tables to the liability for claims and claims adjustment expenses in our consolidated balance sheet: (in thousands) At Net outstanding liabilities: Personal automobile $ 111,604 Homeowners 18,323 Commercial automobile 142,443 Commercial multi-peril 117,537 Workers ’ 110,449 Other 17,759 518,115 Reinsurance recoverable: Personal automobile $ 117,575 Homeowners 10,597 Commercial automobile 90,436 Commercial multi-peril 75,801 Workers ’ 86,479 Other 7,420 388,308 Unallocated loss adjustment expenses $ 55,584 Gross liability for unpaid losses and loss expenses $ 962,007 The following table presents supplementary information about average historical claims duration as of December 31, 2020: Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance Years 1 2 3 4 5 6 7 8 9 10 Personal automobile 64.6 % 17.1 % 8.6 % 4.4 % 2.5 % 0.8 % 0.3 % 0.4 % — % 0.1 % Homeowners 82.0 15.2 1.2 0.4 0.2 0.1 0.2 — — — Commercial automobile 42.5 18.3 13.5 11.1 6.1 2.5 0.8 0.4 0.7 — Commercial multi-peril 46.4 17.1 10.2 10.0 6.9 3.4 1.6 0.6 0.2 0.1 Workers’ compensation 29.9 31.6 15.2 8.1 3.5 2.2 1.3 0.9 0.3 0.4

Borrowings

Borrowings	12 Months Ended
	Dec. 31, 2020
Debt Disclosure [Abstract]
Borrowings	9 - Borrowings Lines of Credit In August 2020, we entered into a new credit agreement with Manufacturers and Traders Trust Company (“M&T”) that related to a $20.0 million unsecured demand line of credit. The line of credit has no expiration date, no Atlantic States is a member of the FHLB of Pittsburgh. Through its membership, Atlantic States has the ability to issue debt to the FHLB of Pittsburgh in exchange for cash advances. In August 2019, Atlantic States exchanged a variable-rate cash advance of $35.0 million that was due in March 2020 for a fixed-rate cash advance of $35.0 million that was outstanding at December 31, 2020. Atlantic States incurred a penalty of $176,000 related to the early termination of its previous cash advance. The new cash advance carries a fixed interest rate of 1.74% and is due in August 2024. In March 2020, Atlantic States issued $50.0 million of debt to the FHLB of Pittsburgh in exchange for a cash advance in the same amount that was outstanding at December 31, 2020. The debt carries a fixed interest rate of 0.83% and is due in March 2021. Atlantic States obtained this contingent liquidity funding in light of uncertainty surrounding the economic impact of the COVID-19 FHLB stock purchased and owned as part of the agreement $ 3,690,100 Collateral pledged, at par (carrying value $87,466,236) 85,915,094 Borrowing capacity currently available 1,330,109 Subordinated Debentures Donegal Mutual holds a $5.0 million surplus note that MICO issued to increase MICO’s statutory surplus. The surplus note carries an interest rate of 5.00%, and any repayment of principal or payment of interest on the surplus note requires prior approval of the Michigan Department of Insurance and Financial Services. Upon receipt of regulatory approval, MICO paid $250,000 in interest to Donegal Mutual during each of 2020, 2019 and 2018.

Reinsurance

Reinsurance	12 Months Ended
	Dec. 31, 2020
Insurance [Abstract]
Reinsurance	10 - Reinsurance Unaffiliated Reinsurers Our insurance subsidiaries and Donegal Mutual implemented a combined third-party reinsurance program effective January 1, 2019. The coverage and parameters of the fully consolidated program are common to all of our insurance subsidiaries and Donegal Mutual. Our insurance subsidiaries use several different reinsurers, all of which have an A.M. Best rating of A- A- • excess of loss reinsurance, under which the losses of Donegal Mutual and our insurance subsidiaries were automatically reinsured, through a series of contracts, over a set retention of $2.0 million; and • catastrophe reinsurance, under which Donegal Mutual and our insurance subsidiaries recovered, through a series of reinsurance agreements, 100% of an accumulation of many losses resulting from a single event, including natural disasters, over a set retention of $15.0 million up to aggregate losses of $185.0 million per occurrence. As many as 28 reinsurers provided coverage for 2020 on any one treaty with no reinsurer taking more than 20% of any one treaty. In addition to the pooling agreement and third-party reinsurance, our insurance subsidiaries had a catastrophe reinsurance agreement with Donegal Mutual, under which each of our insurance subsidiaries recovered 100% of an accumulation of multiple losses resulting from a single event, including natural disasters, over a set retention of $2.0 million up to aggregate losses of $13.0 million per occurrence. The agreement also provided additional coverage for an accumulation of losses from a single event including a combination of our insurance subsidiaries over a combined retention of $5.0 million. Our insurance subsidiaries and Donegal Mutual also purchased facultative reinsurance to cover certain exposures, including property exposures in excess of the covered limits of their respective treaty reinsurance. The following amounts represent ceded reinsurance transactions with unaffiliated reinsurers during 2020, 2019 and 2018: 2020 2019 2018 Premiums written $ 34,165,635 $ 36,941,997 $ 50,160,604 Premiums earned 35,358,765 39,732,282 51,266,000 Losses and loss expenses 9,835,268 33,615,819 50,652,202 Prepaid reinsurance premiums 5,874,859 7,067,989 10,108,269 Liability for losses and loss expenses 133,158,907 139,694,097 137,904,346 Total Reinsurance The following amounts represent total ceded reinsurance transactions with both affiliated and unaffiliated reinsurers during 2020, 2019 and 2018: 2020 2019 2018 Premiums earned $ 356,669,937 $ 314,859,014 $ 326,198,234 Losses and loss expenses 231,771,575 240,241,845 246,223,074 Prepaid reinsurance premiums 169,418,333 142,475,767 135,379,777 Liability for losses and loss expenses 404,818,480 362,768,427 339,267,525 The following amounts represent the effect of reinsurance on premiums written for 2020, 2019 and 2018: 2020 2019 2018 Direct $ 586,681,839 $ 589,572,526 $ 594,078,723 Assumed 539,070,557 485,233,762 476,482,451 Ceded (383,612,503 ) (322,204,999 ) (326,545,370 ) Net premiums written $ 742,139,893 $ 752,601,289 $ 744,015,804 The following amounts represent the effect of reinsurance on premiums earned for 2020, 2019 and 2018: 2020 2019 2018 Direct $ 584,537,580 $ 591,101,804 $ 593,976,241 Assumed 514,172,696 479,835,610 473,512,866 Ceded (356,669,937 ) (314,859,014 ) (326,198,234 ) Net premiums earned $ 742,040,339 $ 756,078,400 $ 741,290,873 Percentage of assumed premiums earned to net premiums earned 69.3 % 63.5 % 63.9 %

Income Taxes

Income Taxes	12 Months Ended
	Dec. 31, 2020
Income Tax Disclosure [Abstract]
Income Taxes	11 - Income Taxes The Tax Cuts and Jobs Act of 2017 (the “TCJA”) was signed into law in December 2017. The TCJA contained significant changes to corporate taxation, including the reduction of the corporate income tax rate to 21% and the repeal of the corporate alternative minimum tax. The TCJA resulted in our reclassification of an alternative minimum tax credit carryforward of $8.5 million from net deferred tax assets to federal income taxes recoverable in 2017. We generated sufficient taxable income in 2019 to fully utilize this alternative minimum tax credit carryforward. Our provision for income tax expense (benefit) for 2020, 2019 and 2018 consisted of the following: 2020 2019 2018 Current federal income tax $ 10,450,803 $ 8,454,358 $ (11,296,704 ) Deferred federal income tax 6,448 649,928 (4,179,805 ) Federal income tax expense (benefit) $ 10,457,251 $ 9,104,286 $ (15,476,509 ) Pennsylvania income tax — 825,000 — Income tax expense (benefit) $ 10,457,251 $ 9,929,286 $ (15,476,509 ) Our effective tax rate is different from the amount computed at the statutory federal rate of 21%. 2020 2019 2018 Income (loss) before income taxes $ 63,272,503 $ 57,081,030 $ (48,236,849 ) Computed “expected” taxes 13,287,226 11,987,016 (10,129,738 ) Tax-exempt (1,468,806 ) (1,325,197 ) (1,521,090 ) Proration 395,663 357,044 405,204 Dividends received deduction (113,845 ) (1,913,238 ) (99,726 ) Net operating loss carryback (1,640,084 ) — (4,210,523 ) Tax benefit on exercise of options (302,901 ) (64,765 ) (25,938 ) Other, net 299,998 236,676 105,302 Pennsylvania income tax, net of federal benefit — 651,750 — Income tax expense (benefit) $ 10,457,251 $ 9,929,286 $ (15,476,509 ) The tax effects of temporary differences that give rise to significant portions of our deferred tax assets and deferred tax liabilities at December 31, 2020 and 2019 are as follows: 2020 2019 Deferred tax assets: Unearned premium $ 15,481,602 $ 15,482,366 Loss reserves 8,808,342 7,820,683 Net operating loss carryforward 104,041 200,942 Net state operating loss carryforward - DGI Parent 7,850,334 7,519,991 Other 2,342,967 2,603,155 Total gross deferred tax assets 34,587,286 33,627,137 Less valuation allowance (7,850,334 ) (7,538,024 ) Net deferred tax assets 26,736,952 26,089,113 Deferred tax liabilities: Deferred policy acquisition costs 12,422,961 12,449,820 Loss reserve transition adjustment 1,440,793 1,733,056 Other 7,190,085 3,391,926 Total gross deferred tax liabilities 21,053,839 17,574,802 Net deferred tax asset $ 5,683,113 $ 8,514,311 We recorded a net operating loss carryforward for the portion of our taxable loss for 2018 that exceeded our taxable income in 2016 and 2017 Our income tax expense for 2020 included a $1.6 million income tax benefit related to the carryback of 2018 net operating losses to past tax years with higher statutory income tax rates than are currently in effect, as allowed under the Coronavirus Aid, Relief and Economic Security Act that was enacted in March 2020. We recorded a loss reserve transition adjustment in 2018 related to changes the TCJA required with respect to the calculation of loss reserve discounting. Pursuant to the provisions of the TCJA, we will include the loss reserve transition adjustment in our taxable income over eight years beginning in 2018 We provide a valuation allowance when we believe it is more likely than not that we will not realize some portion of a deferred tax asset. At December 31, 2020 and 2019, we established a valuation allowance of $7.9 million and $7.5 million, respectively, for the net state operating loss carryforward of DGI. We determined that we were not required to establish a tax-planning Tax years 2016 through 2020 remained open for examination by tax authorities at December 31, 2020. A net operating loss carryforward of $495,435 of Le Mars that we acquired on January 1, 2004 will expire in 2022 if not utilized and is subject to an annual limitation of approximately $376,000.

Stockholders' Equity

Stockholders' Equity	12 Months Ended
	Dec. 31, 2020
Federal Home Loan Banks [Abstract]
Stockholders' Equity	12 - Stockholders’ Equity Each share of our Class A common stock outstanding at the time of the declaration of any dividend or other distribution payable in cash upon the shares of our Class B common stock is entitled to a dividend or distribution payable at the same time and to stockholders of record on the same date in an amount at least 10% greater than any dividend declared upon each share of our Class B common stock. In the event of our merger or consolidation with or into another entity, the holders of our Class A common stock and the holders of our Class B common stock are entitled to receive the same per share consideration in such merger or consolidation. In the event of our liquidation, dissolution or winding-up, pro-rata On July 18, 2013, our board of directors authorized a share repurchase program pursuant to which we have the authority to purchase up to 500,000 additional shares of our Class A common stock at prices prevailing from time to time in the open market subject to the provisions of the SEC Rule 10b-18 At December 31, 2020 and 2019, our treasury stock consisted of 3,002,588 and 72,465 shares of Class A common stock and Class B common stock, respectively.

Stock Compensation Plans

Stock Compensation Plans	12 Months Ended
	Dec. 31, 2020
Postemployment Benefits [Abstract]
Stock Compensation Plans	13 - Stock Compensation Plans Equity Incentive Plans Since 1996, we have maintained an Equity Incentive Plan for Employees. During 2019, we adopted a plan that made a total of 4,500,000 shares of Class A common stock available for issuance to employees of our subsidiaries and affiliates. The plan provides for the granting of awards by our board of directors in the form of stock options, stock appreciation rights, restricted stock or any combination of the above. The plan provides that stock options may become exercisable up to five years from their date of grant, with an option price not less than fair market value on the date preceding the date of grant. We have not granted any stock appreciation rights. Since 1996, we have maintained an Equity Incentive Plan for Directors. During 2019, we adopted a plan that made 500,000 shares of Class A common stock available for issuance to our directors and the directors of our subsidiaries and affiliates.We may make awards in the form of stock options. The plan also provides for the issuance of 500 shares of restricted stock on the first business day of January in each year to each of our directors and each director of Donegal Mutual who does not serve as one of our directors. We issued 8,500 shares of restricted stock on January 2, 2020 under our director plan. We issued 8,500 shares of restricted stock on January 2, 2019 under our prior director plan. We issued 8,500 shares of restricted stock on January 2, 2018 under our prior director plan. No further shares are available for future option grants for plans in effect prior to 2019. We measure all share-based payments to employees, including grants of employee stock options, using a fair-value-based method and record such expense in our results of operations. In determining the expense we record for stock options granted to directors and employees of our subsidiaries and affiliates, we estimate the fair value of each option award on the date of grant using the Black-Scholes option pricing model. The significant assumptions we utilize in applying the Black-Scholes option pricing model are the risk-free interest rate, expected term, dividend yield and expected volatility. The risk-free interest rate is the implied yield currently available on U.S. Treasury zero coupon issues with a remaining term equal to the expected term used as the assumption in the model. We base the expected term of an option award on our historical experience for similar awards. We determine the dividend yield by dividing the per share dividend by the grant date stock price. We base the expected volatility on the volatility of our stock price over a historical period comparable to the expected term. The weighted-average grant date fair value of options we granted during 2020 was $1.15. We calculated this fair value based upon a risk-free interest rate of 0.20%, an expected life of three years, an expected volatility of 20% and an expected dividend yield of 4%. The weighted-average grant date fair value of options we granted during 2019 was $1.15. We calculated this fair value based upon a risk-free interest rate of 1.64%, an expected life of three years, an expected volatility of 17% and an expected dividend yield of 4%. The weighted-average grant date fair value of options we granted during 2018 was $1.66. We calculated this fair value based upon a risk-free interest rate of 2.68%, an expected life of three years, an expected volatility of 22% and an expected dividend yield of 4%. We charged compensation expense for our stock compensation plans against income before income taxes of $1.1 million, $1.4 million and $1.7 million for the years ended December 31, 2020, 2019 and 2018, respectively, with a corresponding income tax benefit of $229,698, $288,901 and $354,412. At December 31, 2020 and 2019, our total unrecognized compensation cost related to non-vested During 2020, we received cash from option exercises under all stock compensation plans of $17.5 million. We realized actual tax benefits for the tax deductions from option exercises of share-based compensation of $ Information regarding activity in our stock option plans follows: Number of Weighted- Outstanding at December 31, 2017 9,264,462 $ 15.26 Granted - 2018 1,063,000 13.69 Exercised - 2018 (79,961 ) 13.74 Forfeited - 2018 (222,639 ) 16.00 Outstanding at December 31, 2018 10,024,862 15.09 Granted - 2019 1,045,400 14.97 Exercised - 2019 (217,498 ) 13.23 Forfeited - 2019 (416,774 ) 15.88 Outstanding at December 31, 2019 10,435,990 15.09 Granted - 2020 935,099 14.45 Exercised - 2020 (1,294,606 ) 13.52 Forfeited - 2020 (303,908 ) 15.23 Expired - 2020 (78,223 ) $ 13.64 Outstanding at December 31, 2020 9,694,352 $ 15.24 Exercisable at: December 31, 2018 7,936,659 $ 15.02 December 31, 2019 8,449,389 $ 15.13 December 31, 2020 7,786,934 $ 15.42 Shares available for future option grants at December 31, 2020 totaled 3.0 million shares under all plans. The following table summarizes information about stock options outstanding at December 31, 2020: Grant Date Exercise Price Number of Weighted-Average Number of July 27, 2011 $12.50 743,934 1.0 years 743,934 December 20, 2012 14.50 981,759 2.0 years 981,759 December 19, 2013 15.90 1,939,970 3.0 years 1,939,970 December 18, 2014 15.80 1,235,081 4.0 years 1,235,081 December 15, 2016 16.48 1,165,308 1.0 years 1,165,308 December 21, 2017 17.60 763,633 2.0 years 763,633 December 20, 2018 13.69 910,367 3.0 years 606,851 March 4, 2019 13.51 10,000 3.2 years 6,666 December 19, 2019 14.98 1,031,300 4.0 years 343,732 December 17, 2020 14.43 913,000 5.0 years — Total 9,694,352 7,786,934 Employee Stock Purchase Plan Since 1996, we have maintained an Employee Stock Purchase Plan. During 2011, we adopted a plan that made 300,000 shares of our Class A common stock available for issuance. During 2019, we amended the plan to make 500,000 shares of our Class A common stock available for issuance. The plan extends over a 10-year A summary of plan activity follows: Shares Issued Price Shares January 1, 2018 13.34 20,662 July 1, 2018 11.57 27,802 January 1, 2019 11.60 24,834 July 1, 2019 12.24 22,926 January 1, 2020 12.28 20,424 July 1, 2020 12.09 22,662 On January 1, 2021, we issued 23,336 shares at a price of $11.96 per share under this plan. Agency Stock Purchase Plan Since 1996, we have maintained an Agency Stock Purchase Plan. During 2015, we adopted a plan that made 350,000 shares of our Class A common stock available for issuance to agents of our insurance subsidiaries and Donegal Mutual. The plan permits an agent to invest up to $12,000 per subscription period (April 1 to September 30 and October 1 to March 31 of each year) under various methods. We issue stock at the end of each subscription period at a price equal to 90% of the average market price during the last ten

Statutory Net Income, Capital a

Statutory Net Income, Capital and Surplus and Dividend Restrictions	12 Months Ended
	Dec. 31, 2020
Equity [Abstract]
Statutory Net Income, Capital and Surplus and Dividend Restrictions	14 - Statutory Net Income, Capital and Surplus and Dividend Restrictions The following table presents selected information, as filed with state insurance regulatory authorities, for our insurance subsidiaries as determined in accordance with accounting practices prescribed or permitted by such insurance regulatory authorities: 2020 2019 2018 Atlantic States: Statutory capital and surplus $ 279,796,696 $ 259,030,868 $ 230,736,313 Statutory unassigned surplus 175,777,393 155,909,822 140,713,118 Statutory net income (loss) 20,735,871 22,282,231 (23,458,516 ) Southern: Statutory capital and surplus 57,142,228 54,405,568 45,355,785 Statutory unassigned surplus (deficit) 300,409 (2,375,794 ) (6,346,270 ) Statutory net income (loss) 4,350,677 5,061,477 (9,822,457 ) Peninsula: Statutory capital and surplus 49,285,069 39,244,570 32,717,996 Statutory unassigned surplus 30,975,869 20,936,805 14,415,949 Statutory net income (loss) 10,955,796 7,360,378 (6,316,130 ) MICO: Statutory capital and surplus 72,183,575 65,768,590 55,708,442 Statutory unassigned surplus 45,247,698 38,910,008 28,949,919 Statutory net income 12,240,173 9,976,610 6,350,686 Our principal source of cash for payment of dividends is dividends from our insurance subsidiaries. State insurance laws require our insurance subsidiaries to maintain certain minimum capital and surplus amounts on a statutory basis. Our insurance subsidiaries are subject to regulations that restrict the payment of dividends from statutory surplus and may require prior approval of their domiciliary insurance regulatory authorities. Our insurance subsidiaries are also subject to risk-based capital (“RBC”) requirements that may further impact their ability to pay dividends. Our insurance subsidiaries’ statutory capital and surplus at December 31, 2020 exceeded the amount of statutory capital and surplus necessary to satisfy regulatory requirements, including the RBC requirements, by a significant margin. Amounts available for distribution to us as dividends from our insurance subsidiaries without prior approval of insurance regulatory authorities in 2021 are approximately $28.0 million from Atlantic States, $300,000 from Southern, $10.9 million from Peninsula and $12.2 million from MICO, or a total of approximately $51.4 million.

Reconciliation of Statutory Fil

Reconciliation of Statutory Filings to Amounts Reported in the Consolidated Financial Statements	12 Months Ended
	Dec. 31, 2020
Text Block [Abstract]
Reconciliation Of Statutory Filings To Amounts Reported	15 - Reconciliation of Statutory Filings to Amounts Reported in the Consolidated Financial Statements Our insurance subsidiaries must file financial statements with state insurance regulatory authorities using accounting principles and practices prescribed or permitted by those authorities. We refer to these accounting principles and practices as statutory accounting principles (“SAP”). Accounting principles used to prepare these SAP financial statements differ from those used to prepare financial statements on the basis of GAAP. Reconciliations of statutory net income (loss) and capital and surplus, as determined using SAP, to the net income (loss) and stockholders’ equity amounts included in the accompanying consolidated financial statements are as follows: Year Ended December 31, 2020 2019 2018 Statutory net income (loss) of insurance subsidiaries $ 48,282,517 $ 44,680,696 $ (33,246,417 ) Increases (decreases): Deferred policy acquisition costs (127,901 ) (1,330,268 ) 325,267 Deferred federal income taxes (6,448 ) 639,284 4,179,807 Salvage and subrogation recoverable 713,400 207,000 2,061,600 Consolidating eliminations and adjustments (9,516,984 ) (11,048,314 ) (16,013,971 ) Parent-only net income 13,470,668 14,003,346 9,933,374 Net income (loss) $ 52,815,252 $ 47,151,744 $ (32,760,340 ) December 31, 2020 2019 2018 Statutory capital and surplus of insurance subsidiaries $ 458,407,568 $ 418,449,596 $ 364,518,536 Increases (decreases): Deferred policy acquisition costs 59,156,958 59,284,859 60,615,127 Deferred federal income taxes (18,586,428 ) (15,477,843 ) (20,094,374 ) Salvage and subrogation recoverable 20,958,600 20,245,200 20,038,200 Non-admitted 1,315,378 1,727,754 1,904,083 Fixed maturities 15,309,610 (326,795 ) (16,528,367 ) Parent-only equity and other adjustments (18,787,566 ) (32,887,252 ) (11,583,304 ) Stockholders’ equity $ 517,774,120 $ 451,015,519 $ 398,869,901

Supplementary Cash Flow Informa

Supplementary Cash Flow Information	12 Months Ended
	Dec. 31, 2020
Supplemental Cash Flow Elements [Abstract]
Supplementary Cash Flow Information	16 - Supplementary Cash Flow Information The following table reflects net income taxes we paid (recovered) and interest we paid during 2020, 2019 and 2018: 2020 2019 2018 Income taxes $ 12,800,000 $ (9,827,433 ) $ (3,290,247 ) Interest 1,191,800 321,585 1,280,352

Earnings Per Share

Earnings Per Share	12 Months Ended
	Dec. 31, 2020
Earnings Per Share [Abstract]
Earnings Per Share	17 - Earnings Per Share We have two classes of common stock, which we refer to as Class A common stock and Class B common stock. Our Class A common stock is entitled to be paid cash dividends that are at least 10% higher than the cash dividends we pay on our Class B common stock. Accordingly, we use the two-class two-class We present below a reconciliation of the numerators and denominators we used in the basic and diluted per share computations for our Class A common stock: Year Ended December 31, (in thousands, except per share amounts) 2020 2019 2018 Basic earnings (loss) per share: Numerator: Allocation of net income (loss) $ 43,609 $ 38,718 $ (26,691 ) Denominator: Weighted-average shares outstanding 23,707 22,986 22,705 Basic earnings (loss) per share $ 1.84 $ 1.68 $ (1.18 ) Diluted earnings (loss) per share: Numerator: Allocation of net income (loss) $ 43,609 $ 38,718 $ (26,691 ) Denominator: Number of shares used in basic computation 23,707 22,986 22,705 Weighted-average effect of dilutive securities Add: Director and employee stock options 180 211 — Number of shares used in per share computations 23,887 23,197 22,705 Diluted earnings (loss) per share $ 1.83 $ 1.67 $ (1.18 ) We used the following information in the basic and diluted per share computations for our Class B common stock: Year Ended December 31, (in thousands, except per share amounts) 2020 2019 2018 Basic and diluted earnings (loss) per share: Numerator: Allocation of net income (loss) $ 9,206 $ 8,434 $ (6,069 ) Denominator: Weighted-average shares outstanding 5,577 5,577 5,577 Basic and diluted earnings (loss) per share $ 1.65 $ 1.51 $ (1.09 ) During 2020, we did not include options to purchase 6,135,292 shares of our Class A common stock in the computation of diluted earnings per share because the exercise price of the options was greater than the average market price of our Class A common stock.

Condensed Financial Information

Condensed Financial Information of Parent Company	12 Months Ended
	Dec. 31, 2020
Condensed Financial Information Disclosure [Abstract]
Condensed Financial Information of Parent Company	18 - Condensed Financial Information of Parent Company Condensed Balance Sheets (in thousands) December 31, 2020 2019 Assets Investment in subsidiaries/affiliates (equity method) $ 540,665 $ 489,657 Short-term investments 9 2,502 Cash 15,321 2,350 Property and equipment 833 944 Other 1,721 — Total assets $ 558,549 $ 495,453 Liabilities and Stockholders’ Equity Liabilities Cash dividends declared to stockholders $ 4,436 $ 4,075 Notes payable to subsidiary 35,000 35,000 Other 1,339 5,362 Total liabilities 40,775 44,437 Stockholders’ equity 517,774 451,016 Total liabilities and stockholders’ equity $ 558,549 $ 495,453 Condensed Statements of Income (Loss) and Comprehensive Income (Loss) (in thousands) Year Ended December 31, 2020 2019 2018 Statements of Income (Loss) Revenues Dividends from subsidiaries $ 14,000 $ 4,000 $ 11,000 Realized investment gains — 12,378 — Other 463 1,009 3,196 Total revenues 14,463 17,387 14,196 Expenses Operating expenses 1,258 1,420 1,628 Interest 794 1,327 2,224 Total expenses 2,052 2,747 3,852 Income before income tax expense (benefit) and equity in undistributed net income (loss) of subsidiaries 12,411 14,640 10,344 Income tax expense (benefit) 1,059 636 411 Income before equity in undistributed net income (loss) of subsidiaries 13,470 14,004 9,933 Equity in undistributed net income (loss) of subsidiaries 39,345 33,148 (42,693 ) Net income (loss) $ 52,815 $ 47,152 $ (32,760 ) Statements of Comprehensive Income (Loss) Net income (loss) $ 52,815 $ 47,152 $ (32,760 ) Other comprehensive income (loss), net of tax Unrealized gain (loss) - subsidiaries 10,427 14,732 (6,625 ) Other comprehensive income (loss), net of tax 10,627 14,732 (6,625 ) Comprehensive income (loss) $ 63,442 $ 61,884 $ (39,385 ) Condensed Statements of Cash Flows (in thousands) Year Ended December 31, 2020 2019 2018 Cash flows from operating activities: Net income (loss) $ 52,815 $ 47,152 $ (32,760 ) Adjustments: Equity in undistributed net (income) loss of subsidiaries (39,345 ) (33,148 ) 42,694 Realized investment gains — (12,378 ) — Other (5,615 ) 490 2,531 Net adjustments (44,960 ) (45,036 ) 45,225 Net cash provided 7,855 2,116 12,465 Cash flows from investing activities: Net sale (purchases) of short-term investments 2,493 (2,473 ) — Net purchase of property and equipment (18 ) (150 ) (106 ) Sale of DFSC — 33,923 — Sale of equity securities - available for sale — 20,287 — Investment in subsidiaries (1,037 ) (18,283 ) (2,644 ) Other — — (1 ) Net cash received (used) 1,438 33,304 (2,751 ) Cash flows from financing activities: Cash dividends paid (16,976 ) (16,093 ) (15,659 ) Issuance of common stock 20,654 6,481 3,250 Payments on lines of credit — (25,000 ) — Borrowings under lines of credit — — 1,000 Net cash received (used) 3,678 (34,612 ) (11,409 ) Net change in cash 12,971 808 (1,695 ) Cash at beginning of year 2,350 1,542 3,237 Cash at end of year $ 15,321 $ 2,350 $ 1,542

Segment Information

Segment Information	12 Months Ended
	Dec. 31, 2020
Segment Reporting [Abstract]
Segment Information	19 - Segment Information We have three reportable segments, which consist of our investment function, our commercial lines of insurance and our personal lines of insurance. Using independent agents, our insurance subsidiaries market commercial lines of insurance to small and medium-sized We evaluate the performance of the commercial lines and personal lines primarily based upon our insurance subsidiaries’ underwriting results as determined under SAP for our total business. We do not allocate assets to the commercial and personal lines and review the two segments in total for purposes of decision-making. We operate only in the United States, and no single customer or agent provides 10 percent or more of our revenues. Financial data by segment is as follows: 2020 2019 2018 (in thousands) Revenues: Premiums earned: Commercial lines $ 412,877 $ 385,465 $ 337,924 Personal lines 329,163 370,613 403,367 GAAP premiums earned 742,040 756,078 741,291 Net investment income 29,504 29,515 26,908 Investment gains (losses) 2,778 21,985 (4,802 ) Equity in earnings of DFSC — 295 2,694 Other 3,497 4,578 5,737 Total revenues $ 777,819 $ 812,451 $ 771,828 2020 2019 2018 (in thousands) Income (loss) before income taxes: Underwriting income (loss): Commercial lines $ (858 ) $ 8,404 $ (22,059 ) Personal lines 31,764 (1,617 ) (53,590 ) SAP underwriting income (loss) 30,906 6,787 (75,649 ) GAAP adjustments (959 ) (3,079 ) 894 GAAP underwriting income (loss) 29,947 3,708 (74,755 ) Net investment income 29,504 29,515 26,908 Investment gains (losses) 2,778 21,985 (4,802 ) Equity in earnings of DFSC — 295 2,694 Other 1,043 1,578 1,718 Income (loss) before income taxes $ 63,272 $ 57,081 $ (48,237 )

Guaranty Fund and Other Insuran

Guaranty Fund and Other Insurance-Related Assessments	12 Months Ended
	Dec. 31, 2020
Insurance [Abstract]
Guaranty Fund and Other Insurance-Related Assessments	20 - Guaranty Fund and Other Insurance-Related Assessments Our insurance subsidiaries’ liabilities for guaranty fund and other insurance-related assessments were $1.6 million at December 31, 2020 and 2019. These liabilities included $485,322 and $519,462 related to surcharges collected by our insurance subsidiaries on behalf of regulatory authorities for 2020 and 2019, respectively.

Interim Financial Data

Interim Financial Data	12 Months Ended
	Dec. 31, 2020
Quarterly Financial Information Disclosure [Abstract]
Interim Financial Data	21 - Interim Financial Data (unaudited) 2020 First Quarter Second Quarter Third Quarter Fourth Quarter Net premiums earned $ 187,252,778 $ 184,373,768 $ 184,925,733 $ 185,488,060 Total revenues 184,911,206 198,899,772 196,512,266 197,496,666 Net losses and loss expenses 117,246,526 105,349,019 120,881,041 116,287,707 Net income 3,731,121 22,678,778 11,836,998 14,568,355 Net earnings per common share: Class A common stock - basic 0.13 0.80 0.41 0.50 Class A common stock - diluted 0.13 0.79 0.41 0.49 Class B common stock - basic and diluted 0.12 0.72 0.37 0.44 2019 First Quarter Second Quarter Third Quarter Fourth Quarter Net premiums earned $ 188,073,242 $ 188,763,313 $ 189,821,058 $ 189,420,787 Total revenues 214,713,874 198,788,954 198,009,900 200,938,743 Net losses and loss expenses 123,110,656 131,507,280 130,743,395 121,026,333 Net income 23,023,164 4,788,454 5,186,379 14,153,747 Net earnings per common share: Class A common stock - basic 0.82 0.17 0.19 0.50 Class A common stock - diluted 0.82 0.17 0.18 0.50 Class B common stock - basic and diluted 0.75 0.15 0.16 0.45

Schedule III - Supplementary In

Schedule III - Supplementary Insurance Information	12 Months Ended
	Dec. 31, 2020
SEC Schedule, 12-16, Insurance Companies, Supplementary Insurance Information [Abstract]
Schedule III - Supplementary Insurance Information	SCHEDULE III — SUPPLEMENTARY INSURANCE INFORMATION Years Ended December 31, 2020, 2019 and 2018 ($ in thousands) Segment Net Net Net Losses Amortization Other Net Year Ended December 31, 2020 Commercial lines $ 412,877 $ — $ 264,053 $ 66,253 $ 72,245 $ 425,986 Personal lines 329,163 — 195,711 52,819 53,618 316,154 Investments — 29,504 — — — — $ 742,040 $ 29,504 $ 459,764 $ 119,072 $ 125,863 $ 742,140 Year Ended December 31, 2019 Commercial lines $ 385,465 $ — $ 242,685 $ 62,424 $ 61,631 $ 404,879 Personal lines 370,613 — 263,703 60,019 52,931 347,722 Investments — 29,515 — — — — $ 756,078 $ 29,515 $ 506,388 $ 122,443 $ 114,562 $ 752,601 Year Ended December 31, 2018 Commercial lines $ 337,924 $ — $ 246,048 $ 55,143 $ 51,635 $ 349,895 Personal lines 403,367 — 330,410 65,821 61,635 394,121 Investments — 26,908 — — — — $ 741,291 $ 26,908 $ 576,458 $ 120,964 $ 113,270 $ 744,016 At December 31, Segment Deferred Liability Unearned Other Policy 2020 Commercial lines $ 33,246 $ 694,569 $ 301,901 $ — Personal lines 25,911 267,438 235,289 — Investments — — — — $ 59,157 $ 962,007 $ 537,190 $ — 2019 Commercial lines $ 30,947 $ 582,682 $ 266,297 $ — Personal lines 28,338 286,992 243,850 — Investments — — — — $ 59,285 $ 869,674 $ 510,147 $ —

Summary of Significant Accoun_2

Summary of Significant Accounting Policies (Policies)	12 Months Ended
	Dec. 31, 2020
Accounting Policies [Abstract]
Organization and Business	Organization and Business Donegal Mutual Insurance Company (“Donegal Mutual”) organized us as an insurance holding company on August 26, 1986. Our insurance subsidiaries, Atlantic States Insurance Company (“Atlantic States”), Southern Insurance Company of Virginia (“Southern”), the Peninsula Insurance Group (“Peninsula”), which consists of Peninsula Indemnity Company and The Peninsula Insurance Company and Michigan Insurance Company (“MICO”), and affiliates write personal and commercial lines of property and casualty coverages exclusively through a network of independent insurance agents in certain Mid-Atlantic, We have three segments: our investment function, our commercial lines of insurance and our personal lines of insurance. The commercial lines products of our insurance subsidiaries consist primarily of commercial automobile, commercial multi-peril and workers’ compensation policies. The personal lines products of our insurance subsidiaries consist primarily of homeowners and private passenger automobile policies. At December 31, 2020, Donegal Mutual held approximately 42% of our outstanding Class A common stock and approximately 84% of our outstanding Class B common stock. This ownership provides Donegal Mutual with approximately 71% of the total voting power of our common stock. Our insurance subsidiaries and Donegal Mutual have interrelated operations due to a pooling agreement and other intercompany agreements and transactions. While each company maintains its separate corporate existence, our insurance subsidiaries and Donegal Mutual conduct business together as the Donegal Insurance Group. As such, Donegal Mutual and our insurance subsidiaries share the same business philosophy, the same management, the same employees and the same facilities and offer the same types of insurance products. Atlantic States, our largest subsidiary, participates in a proportional reinsurance agreement, or pooling agreement, with Donegal Mutual. Under the pooling agreement, Donegal Mutual and Atlantic States contribute substantially all of their respective premiums, losses and loss expenses to the underwriting pool, and the underwriting pool, acting through Donegal Mutual, then allocates of the pooled business to Atlantic States. Thus, Donegal Mutual and Atlantic States share the underwriting results of the pooled business in proportion to their respective participation in the underwriting pool. In addition, Donegal Mutual has a 100% quota-share reinsurance agreement with Southern Mutual Insurance Company, or Southern Mutual. Donegal Mutual places its assumed business from Southern Mutual into the underwriting pool. The same executive management and underwriting personnel administer products, classes of business underwritten, pricing practices and underwriting standards of Donegal Mutual and our insurance subsidiaries. In addition, as the Donegal Insurance Group, Donegal Mutual and our insurance subsidiaries share a combined business plan to achieve market penetration and underwriting profitability objectives. The products our insurance subsidiaries and Donegal Mutual market are generally complementary, thereby allowing the Donegal Insurance Group to offer a broader range of products to a given market and to expand the Donegal Insurance Group’s ability to service an entire personal lines or commercial lines account. Distinctions within the products of Donegal Mutual and our insurance subsidiaries generally relate to specific risk profiles targeted within similar classes of business, such as preferred tier versus standard tier products, but we do not allocate all of the standard risk gradients to one company. Therefore, the underwriting profitability of the business the individual companies write directly will vary. However, the underwriting pool homogenizes the risk characteristics of all business that Donegal Mutual and Atlantic States write directly. The business Atlantic States derives from the underwriting pool represents a significant percentage of our total consolidated revenues. We refer to Note 3 - Transactions with Affiliates for more information regarding the pooling agreement. Donegal Mutual completed the merger of Mountain States Mutual Casualty Company, or Mountain States, with and into Donegal Mutual effective May 25, 2017. Donegal Mutual was the surviving company in the merger, and Mountain States’ insurance subsidiaries, Mountain States Indemnity Company and Mountain States Commercial Insurance Company (collectively, the “Mountain States insurance subsidiaries”), became insurance subsidiaries of Donegal Mutual upon completion of the merger. Upon completion of the merger, Donegal Mutual assumed all of the policy obligations of Mountain States and began to market its products together with the Mountain States insurance subsidiaries as the Mountain States Insurance Group in four Southwestern states. Donegal Mutual also entered into a 100% quota-share reinsurance agreement with the Mountain States insurance subsidiaries on the merger date. Beginning with policies effective in 2021, Donegal Mutual began to place the business of the Mountain States Insurance Group into the underwriting pool. As a result, our consolidated financial results through December 31, 2020 excluded the results of the Mountain States Insurance Group operations in those Southwestern states. We and Donegal Mutual sold DFSC to Northwest Bancshares, Inc. (“Northwest”) on March 8, 2019, resulting in proceeds valued at approximately $85.8 million in a combination of cash and Northwest common stock. Immediately prior to the closing of the merger, DFSC paid a dividend of approximately $29.2 million to us and Donegal Mutual. As the owner of 48.2% of DFSC’s common stock, we received a dividend payment from DFSC of approximately $14.1 million and consideration from Northwest that included a combination of cash in the amount of $20.5 million and Northwest common stock with a fair value at the closing date of $20.9 million. We recorded a gain of $12.7 million from the sale of DFSC in our results of operations for the first quarter of 2019. We sold the Northwest common stock that we received as part of the consideration during 2019. This transaction represented the culmination of a banking strategy that began with the formation of DFSC in 2000. Effective December 1, 2019, our insurance subsidiaries Le Mars Insurance Company (“Le Mars”) and Sheboygan Falls Insurance Company (“Sheboygan Falls”) merged with and into Atlantic States (the “Mergers”). As a result of the Mergers, the separate corporate existences of Le Mars and Sheboygan Falls ceased and Atlantic States continued as the surviving insurance company. Atlantic States placed the business of Le Mars and Sheboygan Falls, as their policies renewed subsequent to the effective date of the Mergers, into the underwriting pool. In July 2018, we consolidated the branch office operations of Peninsula into our home office operations to achieve economies of scale and enhance service levels for the policyholders of Peninsula. We recorded a restructuring charge of approximately $1.9 million in 2018 for employee termination costs associated with the Peninsula consolidation. We completed the sale of Peninsula’s branch office in 2019 for net proceeds of $1.2 million. We recorded an impairment charge of $1.1 million in other expenses in 2018 related to the value of this real estate.
Basis of Consolidation	Basis of Consolidation Our consolidated financial statements, which we have prepared in accordance with accounting principles generally accepted in the United States of America (“GAAP”), include our accounts and those of our wholly owned subsidiaries. We have eliminated all significant inter-company accounts and transactions in consolidation. The terms “we,” “us,” “our” or the “Company” as we use them in the notes to our consolidated financial statements refer to the consolidated entity.
Use of Estimates	Use of Estimates In preparing our consolidated financial statements, our management makes estimates and assumptions that affect the reported amounts of assets and liabilities at the date of the balance sheet and revenues and expenses for the period then ended. Actual results could differ significantly from those estimates. We make estimates and assumptions that could have a significant effect on amounts and disclosures we report in our consolidated financial statements. The most significant estimates relate to our insurance subsidiaries’ reserves for property and casualty insurance unpaid losses and loss expenses. While we believe our estimates and the estimates of our insurance subsidiaries are appropriate, the ultimate amounts may differ from the estimates provided. We regularly review our methods for making these estimates as well as the continuing appropriateness of the estimated amounts, and we reflect any adjustment we consider necessary in our current results of operations.
Reclassification	Reclassification We have made certain reclassifications in our prior period financial statements to conform to the current year presentation.
Investments	Investments We classify our debt securities into the following categories: Held to Maturity - Debt securities that we have the positive intent and ability to hold to maturity; reported at amortized cost. Available for Sale - Debt securities not classified as held to maturity; reported at fair value, with unrealized gains and losses excluded from income and reported as a separate component of stockholders’ equity (net of tax effects). Short-term investments are carried at amortized cost, which approximates fair value. We make estimates concerning the valuation of our investments and the recognition of other-than-temporary declines in the value of our investments. For equity securities, we measure investments at fair value and recognize changes in fair value in our results of operations. With respect to a debt security that is in an unrealized loss position, we first assess if we intend to sell the debt security. If we determine we intend to sell the debt security, we recognize the impairment loss in our results of operations. If we do not intend to sell the debt security, we determine whether it is more likely than not that we will be required to sell the debt security prior to recovery. If we determine it is more likely than not that we will be required to sell the debt security prior to recovery, we recognize an impairment loss in our results of operations. If we determine it is more likely than not that we will not be required to sell the debt security prior to recovery, we then evaluate whether a credit loss has occurred. We determine whether a credit loss has occurred by comparing the amortized cost of the debt security to the present value of the cash flows we expect to collect. If we expect a cash flow shortfall, we consider that a credit loss has occurred. If we determine that a credit loss has occurred, we consider the impairment to be other than temporary. We then recognize the amount of the impairment loss related to the credit loss in our results of operations, and we recognize the remaining portion of the impairment loss in our other comprehensive income, net of applicable taxes. In addition, we may write down securities in an unrealized loss position based on a number of other factors, including when the fair value of an investment is significantly below its cost, when the financial condition of the issuer of a security has deteriorated, the occurrence of industry, company or geographic events that have negatively impacted the value of a security and rating agency downgrades. We amortize premiums and discounts on debt securities over the life of the security as an adjustment to yield using the effective interest method. We compute investment gains and losses using the specific identification method. We amortize premiums and discounts for mortgage-backed debt securities using anticipated prepayments.
Fair Values of Financial Instruments	Fair Values of Financial Instruments We use the following methods and assumptions in estimating our fair value disclosures: Investments - We present our investments in available-for-sale that have quoted prices in active markets. For fixed maturity securities that generally do not trade on a daily basis, the pricing services prepare estimates of fair value measurements based predominantly on observable market inputs. The pricing services do not use broker quotes in determining the fair values of our investments. Our investment personnel review the estimates of fair value the pricing services provide to determine if the estimates we obtain are representative of fair values based upon the general knowledge of our investment personnel of the market, their research findings related to unusual fluctuations in value and their comparison of such values to execution prices for similar securities. Our investment personnel monitor the market and are familiar with current trading ranges for similar securities and the pricing of specific investments. Our investment personnel review all pricing estimates that we receive from the pricing services against their expectations with respect to pricing based on fair market curves, security ratings, coupon rates, security type and recent trading activity. Our investment personnel review documentation with respect to the pricing services’ pricing methodology that they obtain periodically to determine if the primary pricing sources, market inputs and pricing frequency for various security types are reasonable. We refer to Note 5 - Fair Value Measurements for more information regarding our methods and assumptions in estimating fair values. Cash and Short-Term Investments - The carrying amounts we report in the balance sheet for these instruments approximate their fair values. Premiums and Reinsurance Receivables and Payables - The carrying amounts we report in the balance sheet for these instruments related to premiums and paid losses and loss expenses approximate their fair values. Subordinated Debentures - The carrying amounts we report in the balance sheet for these instruments approximate their fair values.
Revenue Recognition	Revenue Recognition Our insurance subsidiaries recognize insurance premiums as income over the terms of the policies they issue. Our insurance subsidiaries calculate unearned premiums on a daily pro-rata
Policy Acquisition Costs	Policy Acquisition Costs We defer our insurance subsidiaries’ policy acquisition costs, consisting primarily of commissions, premium taxes and certain other underwriting costs, reduced by ceding commissions, related directly to the successful acquisition of new or renewal insurance contracts. We amortize these deferred policy acquisition costs over the period in which our insurance subsidiaries earn the premiums. The method we follow in computing deferred policy acquisition costs limits the amount of such deferred costs to their estimated realizable value, which gives effect to the premium to be earned, related investment income, losses and loss expenses and certain other costs we expect to incur as our insurance subsidiaries earn the premium. Estimates in the calculation of policy acquisition costs have not shown material variability because of uncertainties in applying accounting principles or as a result of sensitivities to changes in key assumptions.
Property and Equipment	Property and Equipment We report property and equipment at depreciated cost that we compute using the straight-line method based upon estimated useful lives of the assets.
Losses and Loss Expenses	Losses and Loss Expenses Liabilities for losses and loss expenses are estimates at a given point in time of the amounts an insurer expects to pay with respect to incurred policyholder claims based on facts and circumstances the insurer knows at that point in time. For example, legislative, judicial and regulatory actions may expand coverage definitions, retroactively mandate coverage or otherwise require our insurance subsidiaries to pay losses for damages that their policies explicitly excluded or did not intend to cover. At the time of establishing its estimates, an insurer recognizes that its ultimate liability for losses and loss expenses will exceed or be less than such estimates. Our insurance subsidiaries base their estimates of liabilities for losses and loss expenses on assumptions as to future loss trends, expected claims severity, judicial theories of liability and other factors. However, during the loss adjustment period, our insurance subsidiaries may learn additional facts regarding individual claims, and, consequently, it often becomes necessary for our insurance subsidiaries to refine and adjust their estimates for these liabilities. We reflect any adjustments to the liabilities for losses and loss expenses of our insurance subsidiaries in our consolidated results of operations in the period in which our insurance subsidiaries make adjustments to their estimates. Our insurance subsidiaries maintain liabilities for the payment of losses and loss expenses with respect to both reported and unreported claims. Our insurance subsidiaries establish these liabilities for the purpose of covering the ultimate costs of settling all losses, including investigation and litigation costs. Our insurance subsidiaries base the amount of their liability for reported losses primarily upon a case-by-case Reserve estimates can change over time because of unexpected changes in assumptions related to our insurance subsidiaries’ external environment and, to a lesser extent, assumptions related to our insurance subsidiaries’ internal operations. For example, our insurance subsidiaries have experienced an increase in claims severity and a lengthening of the claim settlement periods on bodily injury claims during the past several years. In addition, the COVID-19 Our insurance subsidiaries seek to enhance their underwriting results by carefully selecting the product lines they underwrite. Our insurance subsidiaries’ personal lines products primarily include standard and preferred risks in private passenger automobile and homeowners lines. Our insurance subsidiaries’ commercial lines products primarily include business offices, wholesalers, service providers, contractors, artisans and light manufacturing operations. Our insurance subsidiaries have limited exposure to asbestos and other environmental liabilities. Our insurance subsidiaries write no medical malpractice liability risks.
Income Taxes	Income Taxes We currently file a consolidated federal income tax return that includes us and our insurance subsidiaries. We account for income taxes using the asset and liability method. The objective of the asset and liability method is to establish deferred tax assets and liabilities for the temporary differences between the financial reporting basis and the tax basis of our assets and liabilities at enacted tax rates we expect to be in effect when we realize or settle such amounts.
Credit Risk	Credit Risk Our objective is to earn competitive returns by investing in a diversified portfolio of securities. Our portfolio of fixed maturity securities and, to a lesser extent, short-term investments is subject to credit risk. We define this risk as the potential loss in fair value resulting from adverse changes in the borrower’s ability to repay its debt to us. We manage this risk by performing an analysis of prospective investments and through regular reviews of our portfolio by our investment personnel. We also limit the amount of our total investment portfolio that we invest in any one security. Our insurance subsidiaries provide property and liability insurance coverages through independent insurance agencies located throughout their operating areas. Our insurance subsidiaries bill the majority of this business directly to their policyholders, although our insurance subsidiaries bill a portion of their commercial business through their agents, to whom they extend credit in the normal course of business. Our insurance subsidiaries have reinsurance agreements with Donegal Mutual and with a number of major unaffiliated reinsurers.
Reinsurance Accounting and Reporting	Reinsurance Accounting and Reporting Our insurance subsidiaries rely upon reinsurance agreements to limit their maximum net loss from large single risks or risks in concentrated areas and to increase their capacity to write insurance. Reinsurance does not relieve our insurance subsidiaries from liability to their respective policyholders. To the extent that a reinsurer cannot pay losses for which it is liable under the terms of a reinsurance agreement with one or more of our insurance subsidiaries, our insurance subsidiaries retain continued liability for such losses. However, in an effort to reduce the risk of non-payment, A- A- -
Stock-Based Compensation	Stock-Based Compensation We measure all share-based payments to our directors and the directors and employees of our subsidiaries and affiliates, including grants of stock options, using a fair-value-based method and record such expense in our results of operations. In determining the expense we record for stock options we grant to our directors and the directors and employees of our subsidiaries and affiliates, we estimate the fair value of each option award on the date of grant using the Black-Scholes option pricing model. The significant assumptions we utilize in applying the Black-Scholes option pricing model are the risk-free interest rate, expected term, dividend yield and expected volatility. In 2020, 2019 and 2018, we realized $302,901, $64,765 and $25,938, respectively, in tax benefits upon the exercise of stock options.
Earnings per Share	Earnings Per Share We calculate basic earnings per share by dividing net income by the weighted-average number of common shares outstanding for the period. Diluted earnings per share reflects the dilution that could occur if securities or other contracts to issue common stock were exercised or converted into common stock. We have two classes of common stock, which we refer to as Class A common stock and Class B common stock. Our Class A common stock is entitled to the declaration and payment of cash dividends that are at least 10% higher than those we declare and pay on our Class B common stock. Accordingly, we use the two-class method for the computation of earnings per common share. The two-class method
Goodwill and Other Intangible Assets	Goodwill and Other Intangible Assets Goodwill represents the excess of the purchase price over the underlying fair value of acquired entities. When completing acquisitions, we seek also to identify separately identifiable intangible assets that we have acquired. We assess goodwill and intangible assets with an indefinite useful life for impairment annually. We also assess goodwill and other intangible assets for impairment upon the occurrence of certain events. In making our assessment, we consider a number of factors including operating results, business plans, economic projections, anticipated future cash flows and current market data. Inherent uncertainties exist with respect to these factors and to our judgment in applying them when we make our assessment. Impairment of goodwill and other intangible assets could result from changes in economic and operating conditions in future periods.
Impact of New Accounting Standards	In February 2016, the FASB issued guidance that requires lessees to recognize leases, including operating leases, on the lessee’s balance sheet, unless a lease is considered a short-term lease. This guidance also requires entities to make new judgments to identify leases. The guidance was effective for annual and interim reporting periods beginning after December 15, 2018 and permitted early adoption. Our adoption of this guidance on January 1, 2019 did not have a significant impact on our financial position, results of operations or cash flows. In January 2017, the FASB issued guidance that simplifies the measurement of goodwill by modifying the goodwill impairment test previous guidance required. The guidance requires an entity to perform its annual or interim goodwill impairment test by comparing the fair value of a reporting unit with its carrying amount and recognize impairment for the amount by which the reporting unit’s carrying amount exceeds its fair value. The guidance was effective for annual and interim reporting periods beginning after December 15, 2019 and permitted early adoption. We early adopted this guidance in 2019. The adoption of this guidance did not have a significant impact on our financial position, results of operations or cash flows. In August 2018, the FASB issued guidance that modifies disclosure requirements related to fair value measurements. The guidance removes the requirements to disclose the amounts of, and reasons for, transfers between Level 1 and Level 2 of the fair value hierarchy. The guidance was effective for annual and interim reporting periods beginning after December 15, 2019 and permitted early adoption. We early adopted this guidance in 2019. The adoption of this guidance on January 1, 2019 did not have a significant impact on our financial position, results of operations or cash flows. In September 2016, the FASB issued guidance that amends previous guidance on the impairment of financial instruments by adding an impairment model that requires an entity to recognize expected credit losses as an allowance rather than impairments as credit losses are incurred. The intent of this guidance is to reduce complexity and result in a more timely recognition of expected credit losses. In November 2019, the FASB issued guidance that delays the effective date for “smaller reporting companies,” as defined in Item 10(f)(1) of Regulation S-K, to In December 2019, the FASB issued guidance that simplifies accounting for income taxes. The guidance eliminates certain exceptions related to the approach for intra-period tax allocation, the methodology for calculating income taxes in an interim period and the recognition of deferred tax liabilities for outside basis differences. The guidance was effective January 1, 2021, using the retrospective method or modified retrospective method for certain changes and the prospective method for all other changes, and permits early adoption. We do not expect our adoption of this guidance in 2021 to have a significant impact on our financial position, results of operations or cash flows.

Transactions with Affiliates (T

Transactions with Affiliates (Tables)	12 Months Ended
	Dec. 31, 2020
Text Block [Abstract]
Schedule of Reinsurance Atlantic States Ceded to Pool	The following amounts represent reinsurance Atlantic States ceded to the pool during 2020, 2019 and 2018: 2020 2019 2018 Premiums earned $ 266,400,636 $ 218,642,984 $ 212,928,238 Losses and loss expenses 181,205,743 173,238,503 159,495,489 Prepaid reinsurance premiums 146,387,565 116,189,929 106,224,424 Liability for losses and loss expenses 232,540,607 183,326,589 158,081,925
Schedule of Reinsurance Atlantic States Assumed from Pool	The following amounts represent reinsurance Atlantic States assumed from the pool during 2020, 2019 and 2018: 2020 2019 2018 Premiums earned $ 514,172,448 $ 479,835,362 $ 473,512,781 Losses and loss expenses 309,315,497 309,852,141 335,789,280 Unearned premiums 262,004,199 237,106,338 231,958,181 Liability for losses and loss expenses 377,530,215 322,658,731 303,546,744
Schedule of Reinsurance Ceded to Donegal Mutual Pursuant to these Quota-Share Reinsurance Agreements	The following amounts represent reinsurance ceded to Donegal Mutual pursuant to these quota-share reinsurance agreements during 2020, 2019 and 2018: 2020 2019 2018 Premiums earned $ 39,315,398 $ 42,079,112 $ 42,813,929 Losses and loss expenses 15,471,037 19,617,787 23,175,456 Prepaid reinsurance premiums 17,155,909 19,217,849 19,047,084 Liability for losses and loss expenses 35,306,627 36,597,834 38,434,078
Schedule of Insurance Subsidiaries Ceded to Donegal Mutual Pursuant to these Reinsurance Agreements	The following amounts represent reinsurance that our insurance subsidiaries ceded to Donegal Mutual pursuant to these reinsurance agreements during 2020, 2019 and 2018: 2020 2019 2018 Premiums earned $ 15,595,138 $ 14,404,636 $ 19,190,067 Losses and loss expenses 25,259,527 13,769,736 12,899,927 Liability for losses and loss expenses 3,812,339 3,149,907 4,847,176
Schedule of Affiliated Reinsurance Transactions on Net Premiums Our Insurance Subsidiaries Earned	The following amounts represent the effect of affiliated reinsurance transactions on net premiums our insurance subsidiaries earned during 2020, 2019 and 2018: 2020 2019 2018 Assumed $ 514,172,448 $ 479,835,362 $ 473,512,781 Ceded (321,311,172 ) (275,126,732 ) (274,932,234 ) Net $ 192,861,276 $ 204,708,630 $ 198,580,547
Schedule of Reinsurance Transactions on Net Losses and Loss Expenses Our Insurance Subsidiaries Incurred	The following amounts represent the effect of affiliated reinsurance transactions on net losses and loss expenses our insurance subsidiaries incurred during 2020, 2019 and 2018: 2020 2019 2018 Assumed $ 309,311,098 $ 309,844,705 $ 335,684,463 Ceded (221,936,307 ) (206,626,026 ) (195,570,872 ) Net $ 87,374,791 $ 103,218,679 $ 140,113,591

Investments (Tables)

Investments (Tables)	12 Months Ended
	Dec. 31, 2020
Investments, Debt and Equity Securities [Abstract]
Summary of Amortized Cost and Estimated Fair Values of Fixed Maturities	The amortized cost and estimated fair values of our fixed maturities at December 31, 2020 and 2019 are as follows: 2020 Held to Maturity Amortized Cost Gross Gross Estimated Fair U.S. Treasury securities and obligations of U.S. government corporations and agencies $ 77,435,268 $ 3,983,890 $ 223,564 $ 81,195,594 Obligations of states and political subdivisions 312,319,238 23,211,483 142,750 335,387,971 Corporate securities 173,269,560 18,172,244 205,761 191,236,043 Mortgage-backed securities 23,585,373 1,235,840 — 24,821,213 Totals $ 586,609,439 $ 46,603,457 $ 572,075 $ 632,640,821 2020 Available for Sale Amortized Cost Gross Gross Estimated Fair U.S. Treasury securities and obligations of U.S. government corporations and agencies $ 47,511,872 $ 423,855 $ 121,015 $ 47,814,712 Obligations of states and political subdivisions 66,286,667 2,690,335 11,765 68,965,237 Corporate securities 202,396,309 10,496,218 184,464 212,708,063 Mortgage-backed securities 218,763,252 6,901,676 16,923 225,648,005 Totals $ 534,958,100 $ 20,512,084 $ 334,167 $ 555,136,017 2019 Held to Maturity Amortized Cost Gross Gross Estimated Fair U.S. Treasury securities and obligations of U.S. government corporations and agencies $ 82,916,052 $ 1,803,230 $ 68,560 $ 84,650,722 Obligations of states and political subdivisions 204,634,486 14,236,736 288,174 218,583,048 Corporate securities 156,398,001 8,274,912 333,166 164,339,747 Mortgage-backed securities 32,145,243 611,641 16,057 32,740,827 Totals $ 476,093,782 $ 24,926,519 $ 705,957 $ 500,314,344 2019 Available for Sale Amortized Cost Gross Gross Estimated Fair U.S. Treasury securities and obligations of U.S. government corporations and agencies $ 19,302,056 $ 81,773 $ 19,370 $ 19,364,459 Obligations of states and political subdivisions 55,162,046 1,641,171 6,929 56,796,288 Corporate securities 154,946,586 4,477,035 180,312 159,243,309 Mortgage-backed securities 327,428,590 2,856,820 737,663 329,547,747 Totals $ 556,839,278 $ 9,056,799 $ 944,274 $ 564,951,803
Summary of Amortized Cost and Estimated Fair Value of Fixed Maturities by Contractual Maturity	Expected maturities may differ from contractual maturities because borrowers may have the right to call or prepay obligations with or without call or prepayment penalties. Amortized Cost Estimated Fair Held to maturity Due in one year or less $ 17,487,922 $ 17,751,370 Due after one year through five years 91,293,064 97,632,535 Due after five years through ten years 205,058,526 222,703,673 Due after ten years 249,184,554 269,732,030 Mortgage-backed securities 23,585,373 24,821,213 Total held to maturity $ 586,609,439 $ 632,640,821 Available for sale Due in one year or less $ 55,448,556 $ 55,677,592 Due after one year through five years 99,633,832 105,770,506 Due after five years through ten years 130,984,165 136,888,915 Due after ten years 30,128,295 31,150,999 Mortgage-backed securities 218,763,252 225,648,005 Total available for sale $ 534,958,100 $ 555,136,017
Summary of Cost and Estimated Fair Values of Equity Securities	The cost and estimated fair values of our equity securities at December 31, 2020 were as follows: Cost Gross Gains Gross Estimated Equity securities $ 42,409,750 $ 17,103,055 $ 956,632 $ 58,556,173 The cost and estimated fair values of our equity securities at December 31, 2019 were as follows: Cost Gross Gains Gross Estimated Fair Equity securities $ 43,419,136 $ 12,179,912 $ 121,492 $ 55,477,556
Summary of Net Investment Income, consisting Primarily of Interest and Dividends	We derived net investment income, consisting primarily of interest and dividends, from the following sources: 2020 2019 2018 Fixed maturities $ 30,750,231 $ 29,969,774 $ 27,733,555 Equity securities 1,386,343 1,268,056 1,264,120 Short-term investments 427,392 1,243,104 795,522 Other 29,250 29,251 29,450 Investment income 32,593,216 32,510,185 29,822,647 Investment expenses (3,088,750 ) (2,995,230 ) (2,914,991 ) Net investment income $29,504,466 $29,514,955 $ 26,907,656
Summary of Gross Investment Gains and Losses before Applicable Income Taxes	We present below gross gains and losses from investments, including those we classified as held to maturity, and the change in the difference between fair value and cost of investments: 2020 2019 2018 Gross gains: Fixed maturities $ 818,350 $ 470,983 $ 131,660 Equity securities 8,532,881 10,471,285 1,890,762 Investment in affiliate — 12,662,147 9,351,231 23,604,415 2,022,422 Gross losses: Fixed maturities 246,243 323,746 630,904 Equity securities 6,327,069 1,296,052 6,193,027 6,573,312 1,619,798 6,823,931 Net investment gains (losses) $ 2,777,919 $ 21,984,617 $ (4,801,509 ) Change in difference between fair value and cost of Fixed maturities $ 33,876,212 $ 38,647,456 $ (20,641,433 ) Equity securities 4,088,003 9,334,127 (3,501,853 ) Totals $ 37,964,215 $ 47,981,583 $ (24,143,286 )
Summary of Fixed Maturities with Unrealized Losses	We held fixed maturities with unrealized losses representing declines that we considered temporary at December 31, 2020 as follows: Less than 12 months 12 months or longer Fair Value Unrealized Fair Value Unrealized U.S. Treasury securities and obligations of U.S. government corporations and $ 29,144,224 $ 344,579 $ — $ — Obligations of states and political subdivisions 9,361,435 154,515 — — Corporate securities 26,142,933 114,606 8,229,646 275,619 Mortgage-backed securities 3,091,272 15,425 236,560 1,498 Totals $ 67,739,864 $ 629,125 $ 8,466,206 $ 277,117 We held fixed maturities with unrealized losses representing declines that we considered temporary at December 31, 2019 as follows: Less than 12 months 12 months or longer Fair Value Unrealized Fair Value Unrealized U.S. Treasury securities and obligations of U.S. government corporations and $ 7,461,245 $ 45,688 $ 5,394,735 $ 42,242 Obligations of states and political subdivisions 23,339,340 293,516 2,326,813 1,587 Corporate securities 19,362,346 263,280 18,803,546 250,198 Mortgage-backed securities 28,507,123 55,729 74,088,769 697,991 Totals $ 78,670,054 $ 658,213 $ 100,613,863 $ 992,018

Fair Value Measurements (Tables

Fair Value Measurements (Tables)	12 Months Ended
	Dec. 31, 2020
Fair Value Disclosures [Abstract]
Fair Value Measurements for Investments in Available-for-Sale Fixed Maturity and Equity Securities	The following table presents our fair value measurements for our investments in available-for-sale Fair Value Measurements Using Fair Value Quoted Prices in Significant Significant (in thousands) U.S. Treasury securities and obligations of U.S. government corporations and agencies $ 47,814,712 $ — $ 47,814,712 $ — Obligations of states and political subdivisions 68,965,237 — 68,965,237 — Corporate securities 212,708,063 — 212,708,063 — Mortgage-backed securities 225,648,005 — 225,648,005 — Equity securities 58,556,173 54,152,085 4,404,088 — Total investments in the fair value hierarchy $ 613,692,190 $ 54,152,085 $ 559,540,105 $ — The following table presents our fair value measurements for our investments in available-for-sale Fair Value Measurements Using Fair Value Quoted Prices Active for Significant Significant (in thousands) U.S. Treasury securities and obligations of U.S. government corporations and agencies $ 19,364,459 $ — $ 19,364,459 $ — Obligations of states and political subdivisions 56,796,288 — 56,796,288 — Corporate securities 159,243,309 — 159,243,309 — Mortgage-backed securities 329,547,747 — 329,547,747 — Equity securities 55,477,556 53,124,368 2,353,188 — Total investments in the fair value hierarchy $ 620,429,359 $ 53,124,368 $ 567,304,991 $ —

Deferred Policy Acquisition C_2

Deferred Policy Acquisition Costs (Tables)	12 Months Ended
	Dec. 31, 2020
Insurance [Abstract]
Changes in Insurance Subsidiaries' Deferred Policy Acquisition Costs	Changes in our insurance subsidiaries’ deferred policy acquisition costs are as follows: 2020 2019 2018 Balance, January 1 $ 59,284,859 $ 60,615,127 $ 60,289,860 Acquisition costs deferred 118,944,099 121,112,732 121,289,267 Amortization charged to earnings (119,072,000 ) (122,443,000 ) (120,964,000 ) Balance, December 31 $ 59,156,958 $ 59,284,859 $ 60,615,127

Property and Equipment (Tables)

Property and Equipment (Tables)	12 Months Ended
	Dec. 31, 2020
Property, Plant and Equipment [Abstract]
Property and Equipment	Property and equipment at December 31, 2020 and 2019 consisted of the following: 2020 2019 Estimated Useful Office equipment $ 8,809,344 $ 8,660,163 3-15 years Automobiles 301,119 301,119 5 years Real estate 4,921,056 4,977,813 5 50 Software 2,065,927 2,065,927 5 years 16,097,446 16,005,022 Accumulated depreciation (11,707,069 ) (11,446,950 ) $ 4,390,377 $ 4,558,072

Liability for Losses and Loss_2

Liability for Losses and Loss Expenses (Tables)	12 Months Ended
	Dec. 31, 2020
Text Block [Abstract]
Summary of Insurance Subsidiaries' Liability for Losses and Loss Expenses	We summarize activity in our insurance subsidiaries’ liability for losses and loss expenses as follows: 2020 2019 2018 Balance at January 1 $ 869,673,849 $ 814,665,224 $ 676,671,727 Less reinsurance recoverable (362,768,427 ) (339,267,525 ) (293,271,257 ) Net balance at January 1 506,905,422 475,397,699 383,400,470 Incurred related to: Current year 472,709,060 519,319,941 540,826,810 Prior years (12,944,767 ) (12,932,277 ) 35,631,610 Total incurred 459,764,293 506,387,664 576,458,420 Paid related to: Current year 236,984,291 278,923,614 308,578,285 Prior years 172,496,467 195,956,327 175,882,906 Total paid 409,480,758 474,879,941 484,461,191 Net balance at December 31 557,188,957 506,905,422 475,397,699 Plus reinsurance recoverable 404,818,480 362,768,427 339,267,525 Balance at December 31 $ 962,007,437 $ 869,673,849 $ 814,665,224
Summary of Incurred and Paid Claims Development, Net of Reinsurance and Cumulative Claim Frequency and Total of IBNR Reserves Plus Expected Development on Reported Claims	The following tables present information about incurred and paid claims development as of December 31, 2020, net of reinsurance, as well as cumulative claim frequency and the total of IBNR reserves plus expected development on reported claims that our insurance subsidiaries included within their net incurred claims amounts. The tables include unaudited information about incurred and paid claims development for the years ended December 31, 2011 through 2019, which we present as supplementary information.​​​​​​​ Personal At December 31, 2020 Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance For the Year Ended December 31, Accident 2011 2012 2013 2014 2015 2016 2017 2018 2019 2020 Total IBNR Cumulative Unaudited (dollars and reported claims in thousands) 2011 $ 127,929 $ 131,678 $ 132,987 $ 133,229 $ 133,617 $ 133,218 $ 133,145 $ 133,142 $ 133,207 $ 133,192 $ 69 75 2012 130,415 133,201 135,592 136,493 136,552 136,463 136,141 136,677 136,648 194 69 2013 124,965 130,737 131,594 132,643 132,604 132,934 132,853 132,690 136 66 2014 124,426 124,806 124,210 126,200 126,779 126,734 126,861 219 71 2015 137,569 139,333 139,181 142,493 142,408 142,073 499 70 2016 150,216 153,937 157,516 157,943 156,935 1,349 73 2017 166,690 176,728 175,939 174,784 2,567 79 2018 186,580 183,358 181,558 5,837 81 2019 161,056 157,689 10,276 68 2020 111,483 25,587 42 Total $ 1,453,913 Personal Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance For the Year Ended December 31, Accident Year 2011 2012 2013 2014 2015 2016 2017 2018 2019 2020 Unaudited (in thousands) 2011 $ 87,191 $ 110,249 $ 121,621 $ 127,545 $ 131,319 $ 132,479 $ 132,714 $ 132,777 $ 132,835 $ 133,002 2012 87,517 111,941 124,652 130,862 133,428 134,581 135,132 136,137 136,165 2013 84,241 109,051 120,118 125,946 130,026 131,326 131,642 132,215 2014 85,377 104,736 114,893 120,491 123,815 124,926 125,619 2015 93,611 116,303 128,395 135,027 139,121 140,028 2016 102,433 129,507 143,321 151,159 153,521 2017 111,964 142,372 159,879 166,099 2018 115,585 150,175 163,036 2019 103,101 127,187 2020 66,084 Total 1,342,956 All outstanding liabilities before 2011, net of reinsurance 647 Liabilities for claims and claims adjustment expenses, net of reinsurance $ 111,604 Homeowners At December 31, 2020 Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance For the Year Ended December 31, Accident 2011 2012 2013 2014 2015 2016 2017 2018 2019 2020 Total IBNR Cumulative Unaudited (dollars and reported claims in thousands) 2011 $ 71,256 $ 70,461 $ 70,436 $ 70,381 $ 70,297 $ 70,351 $ 70,479 $ 70,642 $ 70,682 $ 70,689 $ — 26 2012 53,962 54,794 54,468 54,351 54,281 54,381 54,523 54,557 54,548 — 18 2013 50,887 51,121 51,122 50,874 50,988 50,971 51,008 51,064 — 12 2014 56,916 58,378 57,680 57,332 57,288 57,402 57,367 — 17 2015 63,359 63,925 63,053 63,071 63,099 62,993 28 13 2016 62,443 64,064 63,735 63,355 63,279 25 12 2017 79,283 79,911 79,305 79,247 342 17 2018 81,965 83,385 82,905 838 19 2019 73,294 73,554 1,830 15 2020 61,633 6,235 12 Total $ 657,279 Homeowners Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance Accident 2011 2012 2013 2014 2015 2016 2017 2018 2019 2020 Unaudited (in thousands) 2011 $ 57,588 $ 69,345 $ 70,125 $ 70,351 $ 70,541 $ 70,626 $ 70,648 $ 70,692 $ 70,692 $ 70,693 2012 46,566 53,619 54,028 54,298 54,317 54,356 54,557 54,557 54,553 2013 40,949 49,410 50,210 50,478 51,043 50,902 50,967 50,965 2014 45,823 56,255 56,990 57,195 56,995 57,243 57,336 2015 51,885 61,542 62,204 62,590 62,844 62,943 2016 50,125 61,145 62,760 63,144 63,162 2017 67,077 77,663 78,006 78,127 2018 70,385 79,892 80,905 2019 58,074 69,145 2020 51,226 Total 639,055 All outstanding liabilities before 2011, net of reinsurance 99 Liabilities for claims and claims adjustment expenses, net of reinsurance $ 18,323 Commercial At December 31, 2020 Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance For the Year Ended December 31, Accident 2011 2012 2013 2014 2015 2016 2017 2018 2019 2020 Total IBNR Cumulative Unaudited (dollars and reported claims in thousands) 2011 $ 26,642 $ 27,157 $ 28,570 $ 28,893 $ 29,112 $ 29,107 $ 29,487 $ 29,751 $ 29,542 $ 29,493 $ 17 4 2012 26,557 27,720 30,606 31,435 31,278 31,648 31,803 31,896 31,930 27 8 2013 32,902 33,749 34,751 35,240 36,404 36,435 36,569 36,181 64 8 2014 42,760 44,544 47,326 48,213 49,284 49,168 49,308 192 11 2015 46,526 48,323 51,412 54,259 54,517 54,619 452 12 2016 54,302 57,353 65,905 67,127 66,894 861 13 2017 61,484 67,927 67,697 67,249 2,823 13 2018 79,307 81,396 82,313 5,254 15 2019 88,864 91,245 15,356 15 2020 90,367 32,130 13 Total $ 599,599 Commercial Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance Accident 2011 2012 2013 2014 2015 2016 2017 2018 2019 2020 Unaudited (in thousands) 2011 $ 13,876 $ 19,106 $ 24,267 $ 26,973 $ 28,014 $ 28,758 $ 28,836 $ 29,102 $ 29,474 $ 29,476 2012 13,642 20,240 23,718 27,417 29,873 30,402 31,104 31,228 31,263 2013 16,306 23,557 26,879 31,053 34,083 36,004 36,106 36,092 2014 22,707 31,089 39,436 44,374 47,290 48,418 48,603 2015 23,875 35,342 41,678 48,261 51,605 51,992 2016 27,033 38,237 48,837 57,237 60,485 2017 28,707 40,213 49,703 57,128 2018 33,862 47,941 57,451 2019 36,948 53,026 2020 31,884 Total 457,400 All outstanding liabilities before 2011, net of reinsurance 244 Liabilities for claims and claims adjustment expenses, net of reinsurance $ 142,443 Commercial At December 31, 2020 Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance For the Year Ended December 31, Accident 2011 2012 2013 2014 2015 2016 2017 2018 2019 2020 Total IBNR Cumulative Unaudited (dollars and reported claims in thousands) 2011 $ 33,054 $ 35,411 $ 35,942 $ 37,576 $ 37,385 $ 38,270 $ 38,105 $ 38,160 $ 38,434 $ 38,478 $ — 7 2012 29,789 30,716 32,449 34,117 35,755 36,214 36,525 36,876 36,662 — 6 2013 35,683 35,679 37,292 37,205 37,981 37,365 37,453 37,495 (1 ) 6 2014 48,204 50,135 51,843 52,336 53,294 53,116 52,926 119 7 2015 42,070 43,874 44,728 45,104 45,873 45,366 186 6 2016 43,005 46,988 48,267 48,871 48,732 857 6 2017 56,185 56,043 56,517 54,812 2,253 7 2018 66,265 66,470 67,749 6,243 7 2019 71,865 73,836 12,530 7 2020 83,195 26,981 7 Total $ 539,251 Commercial Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance Accident 2011 2012 2013 2014 2015 2016 2017 2018 2019 2020 Unaudited (in thousands) 2011 $ 18,773 $ 24,767 $ 30,286 $ 33,526 $ 36,722 $ 37,759 $ 38,240 $ 38,366 $ 38,413 $ 38,457 2012 16,666 23,384 26,634 29,370 33,327 35,331 35,909 36,329 36,399 2013 19,875 26,216 29,159 33,614 35,104 36,321 37,333 37,436 2014 27,920 35,520 40,936 47,021 50,017 51,615 52,103 2015 21,837 29,419 34,323 39,162 42,849 44,090 2016 19,660 29,402 34,612 41,193 43,435 2017 27,399 36,926 42,691 46,361 2018 30,597 42,296 48,050 2019 28,210 41,266 2020 34,729 Total 422,326 All outstanding liabilities before 2011, net of reinsurance 612 Liabilities for claims and claims adjustment expenses, net of $ 117,537 Workers’ At December 31, 2020 Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance For the Year Ended December 31, Accident 2011 2012 2013 2014 2015 2016 2017 2018 2019 2020 Total IBNR Cumulative Unaudited (dollars and reported claims in thousands) 2011 $ 32,490 $ 35,757 $ 36,614 $ 36,369 $ 35,670 $ 35,039 $ 35,194 $ 34,926 $ 35,034 $ 35,045 $ 27 5 2012 39,142 39,516 38,827 37,926 37,163 36,468 35,954 35,932 36,014 69 5 2013 46,325 47,027 44,289 42,828 42,327 42,555 42,651 42,341 116 6 2014 51,508 51,553 49,288 48,537 47,540 47,693 47,849 193 6 2015 53,332 49,615 45,991 44,986 43,006 42,597 548 5 2016 58,814 49,802 47,883 44,969 44,098 840 5 2017 60,450 56,351 52,687 51,464 2,742 5 2018 62,197 55,291 52,514 4,114 6 2019 60,998 59,624 7,825 6 2020 57,172 19,283 5 Total $ 468,718 Workers’ Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance For the Year Ended December 31, Accident 2011 2012 2013 2014 2015 2016 2017 2018 2019 2020 Unaudited (in thousands) 2011 $ 9,157 $ 21,450 $ 27,517 $ 31,905 $ 32,394 $ 33,067 $ 33,577 $ 33,963 $ 34,109 $ 34,261 2012 11,097 22,963 28,812 31,244 33,196 34,177 34,460 34,622 34,691 2013 13,052 26,043 32,783 36,351 38,877 39,617 40,361 40,827 2014 13,932 28,513 36,284 40,393 42,465 43,866 44,403 2015 13,071 27,531 34,192 36,929 37,936 38,596 2016 14,709 30,344 37,178 40,570 41,208 2017 15,581 31,990 39,684 42,954 2018 17,644 31,928 37,072 2019 16,939 33,009 2020 14,591 Total 361,612 All outstanding liabilities before 2011, net of reinsurance 3,343 Liabilities for claims and claims adjustment expenses, net of reinsurance $ 110,449
Reconciliation of Net Incurred and Paid Claims Development Tables to Liability for Claims and Claim Adjustment Expenses	The following table presents a reconciliation of the net incurred and paid claims development tables to the liability for claims and claims adjustment expenses in our consolidated balance sheet: (in thousands) At Net outstanding liabilities: Personal automobile $ 111,604 Homeowners 18,323 Commercial automobile 142,443 Commercial multi-peril 117,537 Workers ’ 110,449 Other 17,759 518,115 Reinsurance recoverable: Personal automobile $ 117,575 Homeowners 10,597 Commercial automobile 90,436 Commercial multi-peril 75,801 Workers ’ 86,479 Other 7,420 388,308 Unallocated loss adjustment expenses $ 55,584 Gross liability for unpaid losses and loss expenses $ 962,007
Supplementary Information about Average Historical Claims Duration	The following table presents supplementary information about average historical claims duration as of December 31, 2020: Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance Years 1 2 3 4 5 6 7 8 9 10 Personal automobile 64.6 % 17.1 % 8.6 % 4.4 % 2.5 % 0.8 % 0.3 % 0.4 % — % 0.1 % Homeowners 82.0 15.2 1.2 0.4 0.2 0.1 0.2 — — — Commercial automobile 42.5 18.3 13.5 11.1 6.1 2.5 0.8 0.4 0.7 — Commercial multi-peril 46.4 17.1 10.2 10.0 6.9 3.4 1.6 0.6 0.2 0.1 Workers’ compensation 29.9 31.6 15.2 8.1 3.5 2.2 1.3 0.9 0.3 0.4

Borrowings (Tables)

Borrowings (Tables)	12 Months Ended
	Dec. 31, 2020
FHLB of Pittsburgh [Member]
Amount of FHLB of Indianapolis/Pittsburgh Stock Purchased, Collateral Pledged and Assets Related to MICO's/Atlantic States Agreement	The table below presents the amount of FHLB of Pittsburgh stock Atlantic States purchased, collateral pledged and assets related to Atlantic States’ membership in the FHLB of Pittsburgh at December 31, 2020. FHLB stock purchased and owned as part of the agreement $ 3,690,100 Collateral pledged, at par (carrying value $87,466,236) 85,915,094 Borrowing capacity currently available 1,330,109

Reinsurance (Tables)

Reinsurance (Tables)	12 Months Ended
	Dec. 31, 2020
Insurance [Abstract]
Ceded Reinsurance Transactions with Unaffiliated Reinsurers	The following amounts represent ceded reinsurance transactions with unaffiliated reinsurers during 2020, 2019 and 2018: 2020 2019 2018 Premiums written $ 34,165,635 $ 36,941,997 $ 50,160,604 Premiums earned 35,358,765 39,732,282 51,266,000 Losses and loss expenses 9,835,268 33,615,819 50,652,202 Prepaid reinsurance premiums 5,874,859 7,067,989 10,108,269 Liability for losses and loss expenses 133,158,907 139,694,097 137,904,346
Total Ceded Reinsurance Transactions with both Affiliated and Unaffiliated Reinsurers	The following amounts represent total ceded reinsurance transactions with both affiliated and unaffiliated reinsurers during 2020, 2019 and 2018: 2020 2019 2018 Premiums earned $ 356,669,937 $ 314,859,014 $ 326,198,234 Losses and loss expenses 231,771,575 240,241,845 246,223,074 Prepaid reinsurance premiums 169,418,333 142,475,767 135,379,777 Liability for losses and loss expenses 404,818,480 362,768,427 339,267,525
Amounts Represent Effect of Reinsurance on Premiums Written	The following amounts represent the effect of reinsurance on premiums written for 2020, 2019 and 2018: 2020 2019 2018 Direct $ 586,681,839 $ 589,572,526 $ 594,078,723 Assumed 539,070,557 485,233,762 476,482,451 Ceded (383,612,503 ) (322,204,999 ) (326,545,370 ) Net premiums written $ 742,139,893 $ 752,601,289 $ 744,015,804
Amounts Represent Effect of Reinsurance on Premiums Earned	The following amounts represent the effect of reinsurance on premiums earned for 2020, 2019 and 2018: 2020 2019 2018 Direct $ 584,537,580 $ 591,101,804 $ 593,976,241 Assumed 514,172,696 479,835,610 473,512,866 Ceded (356,669,937 ) (314,859,014 ) (326,198,234 ) Net premiums earned $ 742,040,339 $ 756,078,400 $ 741,290,873 Percentage of assumed premiums earned to net premiums earned 69.3 % 63.5 % 63.9 %

Income Taxes (Tables)

Income Taxes (Tables)	12 Months Ended
	Dec. 31, 2020
Income Tax Disclosure [Abstract]
Provision for Income Tax	Our provision for income tax expense (benefit) for 2020, 2019 and 2018 consisted of the following: 2020 2019 2018 Current federal income tax $ 10,450,803 $ 8,454,358 $ (11,296,704 ) Deferred federal income tax 6,448 649,928 (4,179,805 ) Federal income tax expense (benefit) $ 10,457,251 $ 9,104,286 $ (15,476,509 ) Pennsylvania income tax — 825,000 — Income tax expense (benefit) $ 10,457,251 $ 9,929,286 $ (15,476,509 )
Reconciliation of Federal Income Tax Rate	The reasons for such difference and the related tax effects are as follows: 2020 2019 2018 Income (loss) before income taxes $ 63,272,503 $ 57,081,030 $ (48,236,849 ) Computed “expected” taxes 13,287,226 11,987,016 (10,129,738 ) Tax-exempt (1,468,806 ) (1,325,197 ) (1,521,090 ) Proration 395,663 357,044 405,204 Dividends received deduction (113,845 ) (1,913,238 ) (99,726 ) Net operating loss carryback (1,640,084 ) — (4,210,523 ) Tax benefit on exercise of options (302,901 ) (64,765 ) (25,938 ) Other, net 299,998 236,676 105,302 Pennsylvania income tax, net of federal benefit — 651,750 — Income tax expense (benefit) $ 10,457,251 $ 9,929,286 $ (15,476,509 )
Schedule of Deferred Tax Assets and Deferred Tax Liabilities	The tax effects of temporary differences that give rise to significant portions of our deferred tax assets and deferred tax liabilities at December 31, 2020 and 2019 are as follows: 2020 2019 Deferred tax assets: Unearned premium $ 15,481,602 $ 15,482,366 Loss reserves 8,808,342 7,820,683 Net operating loss carryforward 104,041 200,942 Net state operating loss carryforward - DGI Parent 7,850,334 7,519,991 Other 2,342,967 2,603,155 Total gross deferred tax assets 34,587,286 33,627,137 Less valuation allowance (7,850,334 ) (7,538,024 ) Net deferred tax assets 26,736,952 26,089,113 Deferred tax liabilities: Deferred policy acquisition costs 12,422,961 12,449,820 Loss reserve transition adjustment 1,440,793 1,733,056 Other 7,190,085 3,391,926 Total gross deferred tax liabilities 21,053,839 17,574,802 Net deferred tax asset $ 5,683,113 $ 8,514,311

Stock Compensation Plans (Table

Stock Compensation Plans (Tables)	12 Months Ended
	Dec. 31, 2020
Postemployment Benefits [Abstract]
Information Regarding Activity in Stock Option Plans	Information regarding activity in our stock option plans follows: Number of Weighted- Outstanding at December 31, 2017 9,264,462 $ 15.26 Granted - 2018 1,063,000 13.69 Exercised - 2018 (79,961 ) 13.74 Forfeited - 2018 (222,639 ) 16.00 Outstanding at December 31, 2018 10,024,862 15.09 Granted - 2019 1,045,400 14.97 Exercised - 2019 (217,498 ) 13.23 Forfeited - 2019 (416,774 ) 15.88 Outstanding at December 31, 2019 10,435,990 15.09 Granted - 2020 935,099 14.45 Exercised - 2020 (1,294,606 ) 13.52 Forfeited - 2020 (303,908 ) 15.23 Expired - 2020 (78,223 ) $ 13.64 Outstanding at December 31, 2020 9,694,352 $ 15.24 Exercisable at: December 31, 2018 7,936,659 $ 15.02 December 31, 2019 8,449,389 $ 15.13 December 31, 2020 7,786,934 $ 15.42
Summary of Information about Stock Options Outstanding	The following table summarizes information about stock options outstanding at December 31, 2020: Grant Date Exercise Price Number of Weighted-Average Number of July 27, 2011 $12.50 743,934 1.0 years 743,934 December 20, 2012 14.50 981,759 2.0 years 981,759 December 19, 2013 15.90 1,939,970 3.0 years 1,939,970 December 18, 2014 15.80 1,235,081 4.0 years 1,235,081 December 15, 2016 16.48 1,165,308 1.0 years 1,165,308 December 21, 2017 17.60 763,633 2.0 years 763,633 December 20, 2018 13.69 910,367 3.0 years 606,851 March 4, 2019 13.51 10,000 3.2 years 6,666 December 19, 2019 14.98 1,031,300 4.0 years 343,732 December 17, 2020 14.43 913,000 5.0 years — Total 9,694,352 7,786,934
Summary of Plan Activity	A summary of plan activity follows: Shares Issued Price Shares January 1, 2018 13.34 20,662 July 1, 2018 11.57 27,802 January 1, 2019 11.60 24,834 July 1, 2019 12.24 22,926 January 1, 2020 12.28 20,424 July 1, 2020 12.09 22,662

Statutory Net Income, Capital_2

Statutory Net Income, Capital and Surplus and Dividend Restrictions (Tables)	12 Months Ended
	Dec. 31, 2020
Equity [Abstract]
Schedule Of Net Income Capital And Surplus And Dividend Restrictions	The following table presents selected information, as filed with state insurance regulatory authorities, for our insurance subsidiaries as determined in accordance with accounting practices prescribed or permitted by such insurance regulatory authorities: 2020 2019 2018 Atlantic States: Statutory capital and surplus $ 279,796,696 $ 259,030,868 $ 230,736,313 Statutory unassigned surplus 175,777,393 155,909,822 140,713,118 Statutory net income (loss) 20,735,871 22,282,231 (23,458,516 ) Southern: Statutory capital and surplus 57,142,228 54,405,568 45,355,785 Statutory unassigned surplus (deficit) 300,409 (2,375,794 ) (6,346,270 ) Statutory net income (loss) 4,350,677 5,061,477 (9,822,457 ) Peninsula: Statutory capital and surplus 49,285,069 39,244,570 32,717,996 Statutory unassigned surplus 30,975,869 20,936,805 14,415,949 Statutory net income (loss) 10,955,796 7,360,378 (6,316,130 ) MICO: Statutory capital and surplus 72,183,575 65,768,590 55,708,442 Statutory unassigned surplus 45,247,698 38,910,008 28,949,919 Statutory net income 12,240,173 9,976,610 6,350,686

Reconciliation of Statutory F_2

Reconciliation of Statutory Filings to Amounts Reported in the Consolidated Financial Statements (Tables)	12 Months Ended
	Dec. 31, 2020
Text Block [Abstract]
Reconciliations of Statutory Net Income and Capital and Surplus	Reconciliations of statutory net income (loss) and capital and surplus, as determined using SAP, to the net income (loss) and stockholders’ equity amounts included in the accompanying consolidated financial statements are as follows: Year Ended December 31, 2020 2019 2018 Statutory net income (loss) of insurance subsidiaries $ 48,282,517 $ 44,680,696 $ (33,246,417 ) Increases (decreases): Deferred policy acquisition costs (127,901 ) (1,330,268 ) 325,267 Deferred federal income taxes (6,448 ) 639,284 4,179,807 Salvage and subrogation recoverable 713,400 207,000 2,061,600 Consolidating eliminations and adjustments (9,516,984 ) (11,048,314 ) (16,013,971 ) Parent-only net income 13,470,668 14,003,346 9,933,374 Net income (loss) $ 52,815,252 $ 47,151,744 $ (32,760,340 ) December 31, 2020 2019 2018 Statutory capital and surplus of insurance subsidiaries $ 458,407,568 $ 418,449,596 $ 364,518,536 Increases (decreases): Deferred policy acquisition costs 59,156,958 59,284,859 60,615,127 Deferred federal income taxes (18,586,428 ) (15,477,843 ) (20,094,374 ) Salvage and subrogation recoverable 20,958,600 20,245,200 20,038,200 Non-admitted 1,315,378 1,727,754 1,904,083 Fixed maturities 15,309,610 (326,795 ) (16,528,367 ) Parent-only equity and other adjustments (18,787,566 ) (32,887,252 ) (11,583,304 ) Stockholders’ equity $ 517,774,120 $ 451,015,519 $ 398,869,901

Supplementary Cash Flow Infor_2

Supplementary Cash Flow Information (Tables)	12 Months Ended
	Dec. 31, 2020
Supplemental Cash Flow Elements [Abstract]
Net Income Taxes and Interest Paid	The following table reflects net income taxes we paid (recovered) and interest we paid during 2020, 2019 and 2018: 2020 2019 2018 Income taxes $ 12,800,000 $ (9,827,433 ) $ (3,290,247 ) Interest 1,191,800 321,585 1,280,352

Earnings Per Share (Tables)

Earnings Per Share (Tables)	12 Months Ended
	Dec. 31, 2020
Earnings Per Share [Abstract]
Summary of Reconciliation of Numerators and Denominators Used in Basic and Diluted Per Share Computations	We present below a reconciliation of the numerators and denominators we used in the basic and diluted per share computations for our Class A common stock: Year Ended December 31, (in thousands, except per share amounts) 2020 2019 2018 Basic earnings (loss) per share: Numerator: Allocation of net income (loss) $ 43,609 $ 38,718 $ (26,691 ) Denominator: Weighted-average shares outstanding 23,707 22,986 22,705 Basic earnings (loss) per share $ 1.84 $ 1.68 $ (1.18 ) Diluted earnings (loss) per share: Numerator: Allocation of net income (loss) $ 43,609 $ 38,718 $ (26,691 ) Denominator: Number of shares used in basic computation 23,707 22,986 22,705 Weighted-average effect of dilutive securities Add: Director and employee stock options 180 211 — Number of shares used in per share computations 23,887 23,197 22,705 Diluted earnings (loss) per share $ 1.83 $ 1.67 $ (1.18 ) We used the following information in the basic and diluted per share computations for our Class B common stock: Year Ended December 31, (in thousands, except per share amounts) 2020 2019 2018 Basic and diluted earnings (loss) per share: Numerator: Allocation of net income (loss) $ 9,206 $ 8,434 $ (6,069 ) Denominator: Weighted-average shares outstanding 5,577 5,577 5,577 Basic and diluted earnings (loss) per share $ 1.65 $ 1.51 $ (1.09 )

Condensed Financial Informati_2

Condensed Financial Information of Parent Company (Tables)	12 Months Ended
	Dec. 31, 2020
Condensed Financial Information Disclosure [Abstract]
Summary of Condensed Balance Sheets	Condensed Balance Sheets (in thousands) December 31, 2020 2019 Assets Investment in subsidiaries/affiliates (equity method) $ 540,665 $ 489,657 Short-term investments 9 2,502 Cash 15,321 2,350 Property and equipment 833 944 Other 1,721 — Total assets $ 558,549 $ 495,453 Liabilities and Stockholders’ Equity Liabilities Cash dividends declared to stockholders $ 4,436 $ 4,075 Notes payable to subsidiary 35,000 35,000 Other 1,339 5,362 Total liabilities 40,775 44,437 Stockholders’ equity 517,774 451,016 Total liabilities and stockholders’ equity $ 558,549 $ 495,453
Condensed Statements of Income (Loss) and Comprehensive Income (Loss)	Condensed Statements of Income (Loss) and Comprehensive Income (Loss) (in thousands) Year Ended December 31, 2020 2019 2018 Statements of Income (Loss) Revenues Dividends from subsidiaries $ 14,000 $ 4,000 $ 11,000 Realized investment gains — 12,378 — Other 463 1,009 3,196 Total revenues 14,463 17,387 14,196 Expenses Operating expenses 1,258 1,420 1,628 Interest 794 1,327 2,224 Total expenses 2,052 2,747 3,852 Income before income tax expense (benefit) and equity in undistributed net income (loss) of subsidiaries 12,411 14,640 10,344 Income tax expense (benefit) 1,059 636 411 Income before equity in undistributed net income (loss) of subsidiaries 13,470 14,004 9,933 Equity in undistributed net income (loss) of subsidiaries 39,345 33,148 (42,693 ) Net income (loss) $ 52,815 $ 47,152 $ (32,760 ) Statements of Comprehensive Income (Loss) Net income (loss) $ 52,815 $ 47,152 $ (32,760 ) Other comprehensive income (loss), net of tax Unrealized gain (loss) - subsidiaries 10,427 14,732 (6,625 ) Other comprehensive income (loss), net of tax 10,627 14,732 (6,625 ) Comprehensive income (loss) $ 63,442 $ 61,884 $ (39,385 )
Summary of Condensed Statements of Cash Flows	Condensed Statements of Cash Flows (in thousands) Year Ended December 31, 2020 2019 2018 Cash flows from operating activities: Net income (loss) $ 52,815 $ 47,152 $ (32,760 ) Adjustments: Equity in undistributed net (income) loss of subsidiaries (39,345 ) (33,148 ) 42,694 Realized investment gains — (12,378 ) — Other (5,615 ) 490 2,531 Net adjustments (44,960 ) (45,036 ) 45,225 Net cash provided 7,855 2,116 12,465 Cash flows from investing activities: Net sale (purchases) of short-term investments 2,493 (2,473 ) — Net purchase of property and equipment (18 ) (150 ) (106 ) Sale of DFSC — 33,923 — Sale of equity securities - available for sale — 20,287 — Investment in subsidiaries (1,037 ) (18,283 ) (2,644 ) Other — — (1 ) Net cash received (used) 1,438 33,304 (2,751 ) Cash flows from financing activities: Cash dividends paid (16,976 ) (16,093 ) (15,659 ) Issuance of common stock 20,654 6,481 3,250 Payments on lines of credit — (25,000 ) — Borrowings under lines of credit — — 1,000 Net cash received (used) 3,678 (34,612 ) (11,409 ) Net change in cash 12,971 808 (1,695 ) Cash at beginning of year 2,350 1,542 3,237 Cash at end of year $ 15,321 $ 2,350 $ 1,542

Segment Information (Tables)

Segment Information (Tables)	12 Months Ended
	Dec. 31, 2020
Segment Reporting [Abstract]
Summary of Financial Data by Segment	Financial data by segment is as follows: 2020 2019 2018 (in thousands) Revenues: Premiums earned: Commercial lines $ 412,877 $ 385,465 $ 337,924 Personal lines 329,163 370,613 403,367 GAAP premiums earned 742,040 756,078 741,291 Net investment income 29,504 29,515 26,908 Investment gains (losses) 2,778 21,985 (4,802 ) Equity in earnings of DFSC — 295 2,694 Other 3,497 4,578 5,737 Total revenues $ 777,819 $ 812,451 $ 771,828 2020 2019 2018 (in thousands) Income (loss) before income taxes: Underwriting income (loss): Commercial lines $ (858 ) $ 8,404 $ (22,059 ) Personal lines 31,764 (1,617 ) (53,590 ) SAP underwriting income (loss) 30,906 6,787 (75,649 ) GAAP adjustments (959 ) (3,079 ) 894 GAAP underwriting income (loss) 29,947 3,708 (74,755 ) Net investment income 29,504 29,515 26,908 Investment gains (losses) 2,778 21,985 (4,802 ) Equity in earnings of DFSC — 295 2,694 Other 1,043 1,578 1,718 Income (loss) before income taxes $ 63,272 $ 57,081 $ (48,237 )

Interim Financial Data (Tables)

Interim Financial Data (Tables)	12 Months Ended
	Dec. 31, 2020
Quarterly Financial Information Disclosure [Abstract]
Summary of Interim Financial Data	2020 First Quarter Second Quarter Third Quarter Fourth Quarter Net premiums earned $ 187,252,778 $ 184,373,768 $ 184,925,733 $ 185,488,060 Total revenues 184,911,206 198,899,772 196,512,266 197,496,666 Net losses and loss expenses 117,246,526 105,349,019 120,881,041 116,287,707 Net income 3,731,121 22,678,778 11,836,998 14,568,355 Net earnings per common share: Class A common stock - basic 0.13 0.80 0.41 0.50 Class A common stock - diluted 0.13 0.79 0.41 0.49 Class B common stock - basic and diluted 0.12 0.72 0.37 0.44 2019 First Quarter Second Quarter Third Quarter Fourth Quarter Net premiums earned $ 188,073,242 $ 188,763,313 $ 189,821,058 $ 189,420,787 Total revenues 214,713,874 198,788,954 198,009,900 200,938,743 Net losses and loss expenses 123,110,656 131,507,280 130,743,395 121,026,333 Net income 23,023,164 4,788,454 5,186,379 14,153,747 Net earnings per common share: Class A common stock - basic 0.82 0.17 0.19 0.50 Class A common stock - diluted 0.82 0.17 0.18 0.50 Class B common stock - basic and diluted 0.75 0.15 0.16 0.45

Summary of Significant Accoun_3

Summary of Significant Accounting Policies (Detail)	Mar. 08, 2019USD ($)	Jan. 31, 2019USD ($)	Jul. 31, 2018USD ($)	Dec. 31, 2020USD ($)Segment	Dec. 31, 2019USD ($)	Dec. 31, 2018USD ($)
Business Acquisition [Line Items]
Operations commenced date				Aug. 26, 1986
Stock ownership percentage owned by third party				51.80%
Number of operating segments | Segment				3
Voting power percentage of outstanding common stock				71.00%
Tax benefit for tax deductions related to option exercises				$ 302,901	$ 64,765	$ 25,938
Minimum percentage of class A common stock declared dividend excess over class B dividend				10.00%
Premiums and losses related to certain products				69.30%	63.50%	63.90%
Atlantic States [Member]
Business Acquisition [Line Items]
Percentage of share in results of pooled business subsidiary				80.00%
Donegal Mutual [Member]
Business Acquisition [Line Items]
Premiums and losses related to certain products				100.00%
DFSC and North West [Member]
Business Acquisition [Line Items]
Consideration from sale of business	$ 20,500,000
Consideration from sale of business fair value at closing date	20,900,000
DFSC and North West [Member] | Donegal Mutual Insurance Company [Member]
Business Acquisition [Line Items]
Consideration from sale of business	85,800,000
Proceeds from dividend	$ 29,200,000
Peninsula [Member]
Business Acquisition [Line Items]
Restructuring charges			$ 1,900,000
Impairment charge of real estate						$ 1,100,000
Net proceeds from sale of branch		$ 1,200,000
Donegal Financial Services Corporation [Member]
Business Acquisition [Line Items]
Gain (Loss) on Sale of Equity Investments					$ 12,700,000
Donegal Financial Services Corporation [Member] | DFSC and North West [Member]
Business Acquisition [Line Items]
Outstanding stock ownership percentage	48.20%
Dividend payment to be received	$ 14,100,000
Class A Common Stock [Member]
Business Acquisition [Line Items]
Stock ownership percentage held by major shareholder				42.00%
Class B Common Stock [Member]
Business Acquisition [Line Items]
Stock ownership percentage held by major shareholder				84.00%
Minimum percentage of class A common stock declared dividend excess over class B dividend				10.00%

Transactions with Affiliates -

Transactions with Affiliates - Additional Information (Detail) - USD ($)	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Ceded Credit Risk [Line Items]
Premiums and losses related to certain products	69.30%	63.50%	63.90%
Charges for services	$ 153,941,121	$ 134,143,158	$ 126,153,511
Infrastructure related costs allocated	2,800,000
Proportionate share Of the remaining infrastructure costs	19,200,000
Deferred costs	$ 9,000,000
Maximum [Member] | Lease Office Equipment And Automobile [Member]
Ceded Credit Risk [Line Items]
Lease office equipment and automobiles range	10 years
Minimum [Member] | Lease Office Equipment And Automobile [Member]
Ceded Credit Risk [Line Items]
Lease office equipment and automobiles range	3 years
Atlantic States [Member]
Ceded Credit Risk [Line Items]
Percentage of share in results of pooled business subsidiary	80.00%
Coverage under catastrophic occurrence			2,500,000
Donegal Mutual [Member]
Ceded Credit Risk [Line Items]
Percentage of share in results of pooled business owned by third party	20.00%
Premiums and losses related to certain products	100.00%
Premiums and losses related to business of MICO	25.00%
Coverage under catastrophic occurrence	$ 2,000,000
Excess of loss reinsured under an agreement			500,000
Period of Donegal Mutual under lease agreement	10 years
Le Mars [Member]
Ceded Credit Risk [Line Items]
Coverage under catastrophic occurrence			1,000,000
Southern [Member]
Ceded Credit Risk [Line Items]
Premiums and losses related to certain products	100.00%
Coverage under catastrophic occurrence			2,000,000
Excess of loss reinsured under an agreement			500,000
Insurance Subsidiaries [Member]
Ceded Credit Risk [Line Items]
Coverage under catastrophic occurrence	$ 5,000,000		$ 5,000,000
Excess of loss reinsured under an agreement	$ 5,000,000

Transactions with Affiliates _2

Transactions with Affiliates - Schedule of Reinsurance Atlantic States Ceded to Pool (Detail) - USD ($)	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Ceded Credit Risk [Line Items]
Premiums earned	$ 356,669,937	$ 314,859,014	$ 326,198,234
Prepaid reinsurance premiums	169,418,333	142,475,767
Affiliated Entity [Member] | Atlantic States Ceded [Member]
Ceded Credit Risk [Line Items]
Premiums earned	266,400,636	218,642,984	212,928,238
Losses and loss expenses	181,205,743	173,238,503	159,495,489
Prepaid reinsurance premiums	146,387,565	116,189,929	106,224,424
Liability for losses and loss expenses	$ 232,540,607	$ 183,326,589	$ 158,081,925

Transactions with Affiliates _3

Transactions with Affiliates - Schedule of Reinsurance Atlantic States Assumed from Pool (Detail) - USD ($)	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Ceded Credit Risk [Line Items]
Premiums earned	$ 356,669,937	$ 314,859,014	$ 326,198,234
Liability for losses and loss expenses	518,115,000
Affiliated Entity [Member] | Atlantic States Assumed [Member]
Ceded Credit Risk [Line Items]
Premiums earned	514,172,448	479,835,362	473,512,781
Losses and loss expenses	309,315,497	309,852,141	335,789,280
Unearned premiums	262,004,199	237,106,338	231,958,181
Liability for losses and loss expenses	$ 377,530,215	$ 322,658,731	$ 303,546,744

Transactions with Affiliates _4

Transactions with Affiliates - Schedule of Reinsurance Ceded to Donegal Mutual Pursuant to these Quota-Share Reinsurance Agreements (Detail) - USD ($)	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Ceded Credit Risk [Line Items]
Premiums earned	$ 356,669,937	$ 314,859,014	$ 326,198,234
Prepaid reinsurance premiums	169,418,333	142,475,767
Donegal Mutual [Member]
Ceded Credit Risk [Line Items]
Premiums earned	39,315,398	42,079,112	42,813,929
Losses and loss expenses	15,471,037	19,617,787	23,175,456
Prepaid reinsurance premiums	17,155,909	19,217,849	19,047,084
Liability for losses and loss expenses	$ 35,306,627	$ 36,597,834	$ 38,434,078

Transactions with Affiliates _5

Transactions with Affiliates - Schedule of Insurance Subsidiaries Ceded to Donegal Mutual Pursuant to these Reinsurance Agreements (Detail) - USD ($)	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Ceded Credit Risk [Line Items]
Premiums earned	$ 356,669,937	$ 314,859,014	$ 326,198,234
Insurance Subsidiaries [Member]
Ceded Credit Risk [Line Items]
Premiums earned	321,311,172	275,126,732	274,932,234
Catastrophe Reinsurance [Member] | Insurance Subsidiaries [Member]
Ceded Credit Risk [Line Items]
Premiums earned	15,595,138	14,404,636	19,190,067
Losses and loss expenses	25,259,527	13,769,736	12,899,927
Liability for losses and loss expenses	$ 3,812,339	$ 3,149,907	$ 4,847,176

Transactions with Affiliates _6

Transactions with Affiliates - Schedule of Affiliated Reinsurance Transactions on Net Premiums Our Insurance Subsidiaries Earned (Detail) - USD ($)	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Ceded Credit Risk [Line Items]
Assumed	$ 514,172,696	$ 479,835,610	$ 473,512,866
Ceded	(356,669,937)	(314,859,014)	(326,198,234)
Insurance Subsidiaries [Member]
Ceded Credit Risk [Line Items]
Assumed	514,172,448	479,835,362	473,512,781
Ceded	(321,311,172)	(275,126,732)	(274,932,234)
Net	$ 192,861,276	$ 204,708,630	$ 198,580,547

Transactions with Affiliates _7

Transactions with Affiliates - Schedule of Reinsurance Transactions on Net Losses and Loss Expenses Our Insurance Subsidiaries Incurred (Detail) - USD ($)	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Ceded Credit Risk [Line Items]
Assumed	$ 539,070,557	$ 485,233,762	$ 476,482,451
Ceded	(383,612,503)	(322,204,999)	(326,545,370)
Net	742,139,893	752,601,289	744,015,804
Insurance Subsidiaries [Member]
Ceded Credit Risk [Line Items]
Assumed	309,311,098	309,844,705	335,684,463
Ceded	(221,936,307)	(206,626,026)	(195,570,872)
Net	$ 87,374,791	$ 103,218,679	$ 140,113,591

Investments - Summary of Amorti

Investments - Summary of Amortized Cost and Estimated Fair Values of Fixed Maturities (Detail) - USD ($)	Dec. 31, 2020	Dec. 31, 2019
Schedule of Equity Method Investments [Line Items]
Total held to maturity, Amortized Cost	$ 586,609,439	$ 476,093,782
Held to Maturity, Gross Unrealized Gains	46,603,457	24,926,519
Held to Maturity, Gross Unrealized Losses	572,075	705,957
Total held to maturity, Estimated Fair Value	632,640,821	500,314,344
Available for Sale, Amortized Cost	534,958,100	556,839,278
Available for Sale, Gross Unrealized Gains	20,512,084	9,056,799
Available for Sale, Gross Unrealized Losses	334,167	944,274
Available for Sale, Estimated Fair Value	555,136,017	564,951,803
U.S. Treasury Securities and Obligations of U.S. Government Corporations and Agencies [Member]
Schedule of Equity Method Investments [Line Items]
Total held to maturity, Amortized Cost	77,435,268	82,916,052
Held to Maturity, Gross Unrealized Gains	3,983,890	1,803,230
Held to Maturity, Gross Unrealized Losses	223,564	68,560
Total held to maturity, Estimated Fair Value	81,195,594	84,650,722
Available for Sale, Amortized Cost	47,511,872	19,302,056
Available for Sale, Gross Unrealized Gains	423,855	81,773
Available for Sale, Gross Unrealized Losses	121,015	19,370
Available for Sale, Estimated Fair Value	47,814,712	19,364,459
Obligations of States and Political Subdivisions [Member]
Schedule of Equity Method Investments [Line Items]
Total held to maturity, Amortized Cost	312,319,238	204,634,486
Held to Maturity, Gross Unrealized Gains	23,211,483	14,236,736
Held to Maturity, Gross Unrealized Losses	142,750	288,174
Total held to maturity, Estimated Fair Value	335,387,971	218,583,048
Available for Sale, Amortized Cost	66,286,667	55,162,046
Available for Sale, Gross Unrealized Gains	2,690,335	1,641,171
Available for Sale, Gross Unrealized Losses	11,765	6,929
Available for Sale, Estimated Fair Value	68,965,237	56,796,288
Corporate Securities [Member]
Schedule of Equity Method Investments [Line Items]
Total held to maturity, Amortized Cost	173,269,560	156,398,001
Held to Maturity, Gross Unrealized Gains	18,172,244	8,274,912
Held to Maturity, Gross Unrealized Losses	205,761	333,166
Total held to maturity, Estimated Fair Value	191,236,043	164,339,747
Available for Sale, Amortized Cost	202,396,309	154,946,586
Available for Sale, Gross Unrealized Gains	10,496,218	4,477,035
Available for Sale, Gross Unrealized Losses	184,464	180,312
Available for Sale, Estimated Fair Value	212,708,063	159,243,309
Mortgage-Backed Securities [Member]
Schedule of Equity Method Investments [Line Items]
Total held to maturity, Amortized Cost	23,585,373	32,145,243
Held to Maturity, Gross Unrealized Gains	1,235,840	611,641
Held to Maturity, Gross Unrealized Losses		16,057
Total held to maturity, Estimated Fair Value	24,821,213	32,740,827
Available for Sale, Amortized Cost	218,763,252	327,428,590
Available for Sale, Gross Unrealized Gains	6,901,676	2,856,820
Available for Sale, Gross Unrealized Losses	16,923	737,663
Available for Sale, Estimated Fair Value	$ 225,648,005	$ 329,547,747

Investments - Additional Inform

Investments - Additional Information (Detail)	Nov. 30, 2013USD ($)	Dec. 31, 2020USD ($)Securities	Dec. 31, 2019USD ($)	Dec. 31, 2018USD ($)
Schedule of Investments [Line Items]
Net unrealized losses arising prior to reclassification date	$ 15,100,000
Amortization of unrealized losses recorded in accumulated other comprehensive income (loss)		$ 1,400,000
Accumulated other comprehensive loss		11,130,612	$ 504,170
Impairment losses		0	0	$ 0
Sales or transfers, held to maturity		0	0	0
Derivative instruments or hedging activities		0	0	$ 0
Amortized cost of fixed maturities on deposit with various regulatory authorities		9,114,791	8,330,651
Unrealised Gains on Equity Securities		17,103,055	12,179,912
Unrealised Loss on Equity Securities		956,632	121,492
Equity [Member]
Schedule of Investments [Line Items]
Unrealised Gains on Equity Securities		8,400,000	8,900,000
Unrealised Loss on Equity Securities		2.8	25,751,000,000
Obligations of States and Political Subdivisions [Member]
Schedule of Investments [Line Items]
Aggregate fair value of bond held		263,600,000	182,000,000
Amortized cost of bond held		247,500,000	172,300,000
Special Revenue Bonds [Member]
Schedule of Investments [Line Items]
Aggregate fair value of bond held		140,800,000	93,400,000
Amortized cost of bond held		$ 131,100,000	$ 87,500,000
Education Bonds [Member]
Schedule of Investments [Line Items]
Percentage of investments in special revenue bonds		44.00%	44.00%
Water and Sewer Utility Bonds [Member]
Schedule of Investments [Line Items]
Percentage of investments in special revenue bonds		39.00%	35.00%
Fixed Maturities [Member]
Schedule of Investments [Line Items]
Number of fixed maturity securities classified as available for sale | Securities		43
Accumulated Net Unrealized Investment Losses [Member]
Schedule of Investments [Line Items]
Accumulated other comprehensive loss		$ 6,100,000	$ 7,500,000
Minimum [Member]
Schedule of Investments [Line Items]
Percentage of which the company held security of any issuer		10.00%	10.00%

Investments - Summary of Amor_2

Investments - Summary of Amortized Cost and Estimated Fair Value of Fixed Maturities by Contractual Maturity (Detail) - USD ($)	Dec. 31, 2020	Dec. 31, 2019
Held to maturity
Due in one year or less, Amortized Cost	$ 17,487,922
Due after one year through five years, Amortized Cost	91,293,064
Due after five years through ten years, Amortized Cost	205,058,526
Due after ten years, Amortized Cost	249,184,554
Mortgage-backed securities, Amortized Cost	23,585,373
Total held to maturity, Amortized Cost	586,609,439	$ 476,093,782
Available for sale
Due in one year or less, Amortized Cost	55,448,556
Due after one year through five years, Amortized Cost	99,633,832
Due after five years through ten years, Amortized Cost	130,984,165
Due after ten years, Amortized Cost	30,128,295
Mortgage-backed securities, Amortized Cost	218,763,252
Total available for sale, Amortized Cost	534,958,100	556,839,278
Held to maturity
Due in one year or less, Estimated Fair Value	17,751,370
Due after one year through five years, Estimated Fair Value	97,632,535
Due after five years through ten years, Estimated Fair Value	222,703,673
Due after ten years, Estimated Fair Value	269,732,030
Mortgage-backed securities, Estimated Fair Value	24,821,213
Total held to maturity, Estimated Fair Value	632,640,821	500,314,344
Available for sale
Due in one year or less, Estimated Fair Value	55,677,592
Due after one year through five years, Estimated Fair Value	105,770,506
Due after five years through ten years, Estimated Fair Value	136,888,915
Due after ten years, Estimated Fair Value	31,150,999
Mortgage-backed securities, Estimated Fair Value	225,648,005
Total available for sale, Estimated Fair Value	$ 555,136,017	$ 564,951,803

Investments - Summary of Cost a

Investments - Summary of Cost and Estimated Fair Value of Equity Securities (Detail) - USD ($)	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Investments, Debt and Equity Securities [Abstract]
Cost	$ 42,409,750	$ 43,419,136
Gross Gains	17,103,055	12,179,912
Gross Losses	956,632	121,492
Estimated Fair Value	$ 58,556,173	$ 55,477,556

Investments - Summary of Net In

Investments - Summary of Net Investment Income, Consisting Primarily of Interest and Dividends (Detail) - USD ($)	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Marketable Securities [Line Items]
Investment income	$ 32,593,216	$ 32,510,185	$ 29,822,647
Investment expenses	(3,088,750)	(2,995,230)	(2,914,991)
Net investment income	29,504,466	29,514,955	26,907,656
Short-term investments [Member]
Marketable Securities [Line Items]
Investment income	427,392	1,243,104	795,522
Fixed Maturities [Member]
Marketable Securities [Line Items]
Investment income	30,750,231	29,969,774	27,733,555
Equity Securities [Member]
Marketable Securities [Line Items]
Investment income	1,386,343	1,268,056	1,264,120
Other [Member]
Marketable Securities [Line Items]
Investment income	$ 29,250	$ 29,251	$ 29,450

Investments - Summary of Gross

Investments - Summary of Gross Investment Gains and Losses before Applicable Income Taxes (Detail) - USD ($)	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Gain (Loss) on Securities [Line Items]
Gross investment gains	$ 9,351,231	$ 23,604,415	$ 2,022,422
Gross investment losses	6,573,312	1,619,798	6,823,931
Net investment gains (losses)	2,777,919	21,984,617	(4,801,509)
Change in difference between fair value and cost of investments	37,964,215	47,981,583	(24,143,286)
Fixed Maturities [Member]
Gain (Loss) on Securities [Line Items]
Gross investment gains	818,350	470,983	131,660
Gross investment losses	246,243	323,746	630,904
Change in difference between fair value and cost of investments	33,876,212	38,647,456	(20,641,433)
Investments In Affiliates [Member]
Gain (Loss) on Securities [Line Items]
Gross investment gains		12,662,147
Equity Securities [Member]
Gain (Loss) on Securities [Line Items]
Gross investment gains	8,532,881	10,471,285	1,890,762
Gross investment losses	6,327,069	1,296,052	6,193,027
Change in difference between fair value and cost of investments	$ 4,088,003	$ 9,334,127	$ (3,501,853)

Investments - Summary of Fixed

Investments - Summary of Fixed Maturities with Unrealized Losses (Detail) - USD ($)	Dec. 31, 2020	Dec. 31, 2019
Debt Securities, Available-for-sale [Line Items]
Less Than 12 Months, Fair Value	$ 67,739,864	$ 78,670,054
Less Than 12 Months, Unrealized Losses	629,125	658,213
More Than 12 Months, Fair Value	8,466,206	100,613,863
More Than 12 Months, Unrealized Losses	277,117	992,018
U.S. Treasury Securities and Obligations of U.S. Government Corporations and Agencies [Member]
Debt Securities, Available-for-sale [Line Items]
Less Than 12 Months, Fair Value	29,144,224	7,461,245
Less Than 12 Months, Unrealized Losses	344,579	45,688
More Than 12 Months, Fair Value		5,394,735
More Than 12 Months, Unrealized Losses		42,242
Obligations of States and Political Subdivisions [Member]
Debt Securities, Available-for-sale [Line Items]
Less Than 12 Months, Fair Value	9,361,435	23,339,340
Less Than 12 Months, Unrealized Losses	154,515	293,516
More Than 12 Months, Fair Value		2,326,813
More Than 12 Months, Unrealized Losses		1,587
Corporate Securities [Member]
Debt Securities, Available-for-sale [Line Items]
Less Than 12 Months, Fair Value	26,142,933	19,362,346
Less Than 12 Months, Unrealized Losses	114,606	263,280
More Than 12 Months, Fair Value	8,229,646	18,803,546
More Than 12 Months, Unrealized Losses	275,619	250,198
Mortgage-Backed Securities [Member]
Debt Securities, Available-for-sale [Line Items]
Less Than 12 Months, Fair Value	3,091,272	28,507,123
Less Than 12 Months, Unrealized Losses	15,425	55,729
More Than 12 Months, Fair Value	236,560	74,088,769
More Than 12 Months, Unrealized Losses	$ 1,498	$ 697,991

Fair Value Measurements - Fair

Fair Value Measurements - Fair Value Measurements for Investments in Available-for-Sale Fixed Maturity and Equity Securities (Detail) - USD ($)	Dec. 31, 2020	Dec. 31, 2019
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale Securities, Fair Value Disclosure	$ 555,136,017	$ 564,951,803
U.S. Treasury Securities and Obligations of U.S. Government Corporations and Agencies [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale Securities, Fair Value Disclosure	47,814,712	19,364,459
Obligations of States and Political Subdivisions [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale Securities, Fair Value Disclosure	68,965,237	56,796,288
Corporate Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale Securities, Fair Value Disclosure	212,708,063	159,243,309
Mortgage-Backed Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale Securities, Fair Value Disclosure	225,648,005	329,547,747
Assets and Liabilities on Recurring Basis [Member] | Total Investments in the Fair Value Hierarchy [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale Securities, Fair Value Disclosure	613,692,190,000	620,429,359,000
Assets and Liabilities on Recurring Basis [Member] | Total Investments in the Fair Value Hierarchy [Member] | U.S. Treasury Securities and Obligations of U.S. Government Corporations and Agencies [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale Securities, Fair Value Disclosure	47,814,712,000	19,364,459,000
Assets and Liabilities on Recurring Basis [Member] | Total Investments in the Fair Value Hierarchy [Member] | Obligations of States and Political Subdivisions [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale Securities, Fair Value Disclosure	68,965,237,000	56,796,288,000
Assets and Liabilities on Recurring Basis [Member] | Total Investments in the Fair Value Hierarchy [Member] | Corporate Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale Securities, Fair Value Disclosure	212,708,063,000	159,243,309,000
Assets and Liabilities on Recurring Basis [Member] | Total Investments in the Fair Value Hierarchy [Member] | Mortgage-Backed Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale Securities, Fair Value Disclosure	225,648,005,000	329,547,747,000
Assets and Liabilities on Recurring Basis [Member] | Total Investments in the Fair Value Hierarchy [Member] | Equity Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale Securities, Fair Value Disclosure	58,556,173,000	55,477,556,000
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Assets and Liabilities on Recurring Basis [Member] | Total Investments in the Fair Value Hierarchy [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale Securities, Fair Value Disclosure	54,152,085,000	53,124,368,000
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Assets and Liabilities on Recurring Basis [Member] | Total Investments in the Fair Value Hierarchy [Member] | Equity Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale Securities, Fair Value Disclosure	54,152,085,000	53,124,368,000
Significant Other Observable Inputs (Level 2) [Member] | Assets and Liabilities on Recurring Basis [Member] | Total Investments in the Fair Value Hierarchy [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale Securities, Fair Value Disclosure	559,540,105,000	567,304,991,000
Significant Other Observable Inputs (Level 2) [Member] | Assets and Liabilities on Recurring Basis [Member] | Total Investments in the Fair Value Hierarchy [Member] | U.S. Treasury Securities and Obligations of U.S. Government Corporations and Agencies [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale Securities, Fair Value Disclosure	47,814,712,000	19,364,459,000
Significant Other Observable Inputs (Level 2) [Member] | Assets and Liabilities on Recurring Basis [Member] | Total Investments in the Fair Value Hierarchy [Member] | Obligations of States and Political Subdivisions [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale Securities, Fair Value Disclosure	68,965,237,000	56,796,288,000
Significant Other Observable Inputs (Level 2) [Member] | Assets and Liabilities on Recurring Basis [Member] | Total Investments in the Fair Value Hierarchy [Member] | Corporate Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale Securities, Fair Value Disclosure	212,708,063,000	159,243,309,000
Significant Other Observable Inputs (Level 2) [Member] | Assets and Liabilities on Recurring Basis [Member] | Total Investments in the Fair Value Hierarchy [Member] | Mortgage-Backed Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale Securities, Fair Value Disclosure	225,648,005,000	329,547,747,000
Significant Other Observable Inputs (Level 2) [Member] | Assets and Liabilities on Recurring Basis [Member] | Total Investments in the Fair Value Hierarchy [Member] | Equity Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale Securities, Fair Value Disclosure	$ 4,404,088,000	$ 2,353,188,000

Deferred Policy Acquisition C_3

Deferred Policy Acquisition Costs - Changes in Insurance Subsidiaries' Deferred Policy Acquisition Costs (Detail) - USD ($)	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Insurance [Abstract]
Balance, January 1	$ 59,284,859	$ 60,615,127	$ 60,289,860
Acquisition costs deferred	118,944,099	121,112,732	121,289,267
Amortization charged to earnings	(119,072,000)	(122,443,000)	(120,964,000)
Balance, December 31	$ 59,156,958	$ 59,284,859	$ 60,615,127

Property and Equipment - Proper

Property and Equipment - Property and Equipment (Detail) - USD ($)	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Property, Plant and Equipment [Line Items]
Property and equipment, Gross	$ 16,097,446	$ 16,005,022
Accumulated depreciation	(11,707,069)	(11,446,950)
Property and equipment, Net	4,390,377	4,558,072
Office Equipment [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, Gross	8,809,344	8,660,163
Automobiles [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, Gross	$ 301,119	301,119
Lease office equipment and automobiles range	5 years
Real Estate [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, Gross	$ 4,921,056	4,977,813
Software [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, Gross	$ 2,065,927	$ 2,065,927
Lease office equipment and automobiles range	5 years
Maximum [Member] | Office Equipment [Member]
Property, Plant and Equipment [Line Items]
Lease office equipment and automobiles range	15 years
Maximum [Member] | Real Estate [Member]
Property, Plant and Equipment [Line Items]
Lease office equipment and automobiles range	50 years
Minimum [Member] | Office Equipment [Member]
Property, Plant and Equipment [Line Items]
Lease office equipment and automobiles range	3 years
Minimum [Member] | Real Estate [Member]
Property, Plant and Equipment [Line Items]
Lease office equipment and automobiles range	5 years

Property and Equipment - Additi

Property and Equipment - Additional Information (Detail) - USD ($)	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Property, Plant and Equipment [Abstract]
Depreciation expense	$ 257,397	$ 282,235	$ 479,550

Liability for Losses and Loss_3

Liability for Losses and Loss Expenses - Summary of Insurance Subsidiaries' Liability for Losses and Loss Expenses (Detail) - USD ($)	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Liability for Claims and Claims Adjustment Expense [Abstract]
Balance at January 1	$ 869,673,849	$ 814,665,224	$ 676,671,727
Less reinsurance recoverable	(362,768,427)	(339,267,525)	(293,271,257)
Net balance at January 1	506,905,422	475,397,699	383,400,470
Incurred related to:
Current year	472,709,060	519,319,941	540,826,810
Prior years	(12,944,767)	(12,932,277)	35,631,610
Total incurred	459,764,293	506,387,664	576,458,420
Paid related to:
Current year	236,984,291	278,923,614	308,578,285
Prior years	172,496,467	195,956,327	175,882,906
Total paid	409,480,758	474,879,941	484,461,191
Net balance at end of period	557,188,957	506,905,422	475,397,699
Plus reinsurance recoverable	404,818,480	362,768,427	339,267,525
Balance at end of period	$ 962,007,437	$ 869,673,849	$ 814,665,224

Liability for Losses and Loss_4

Liability for Losses and Loss Expenses - Additional Information (Detail) - USD ($)	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]
Increase (Decrease) in liability for losses and loss expenses of prior years	$ (12,944,767)	$ (12,932,277)	$ 35,631,610
Percentage of 2010 development		2.60%	2.70%	9.30%
Personal Automobile [Member]
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]
Reserve created for commercial automobile	$ 20,800,000	$ 17,700,000

Liability for Losses and Loss_5

Liability for Losses and Loss Expenses - Summary of Incurred and Paid Claims Development, Net of Reinsurance (Detail) Claims in Thousands, $ in Thousands	Dec. 31, 2020USD ($)Claims	Dec. 31, 2019USD ($)	Dec. 31, 2018USD ($)	Dec. 31, 2017USD ($)	Dec. 31, 2016USD ($)	Dec. 31, 2015USD ($)	Dec. 31, 2014USD ($)	Dec. 31, 2013USD ($)	Dec. 31, 2012USD ($)	Dec. 31, 2011USD ($)
Personal Automobile [Member]
Claims Development [Line Items]
Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance	$ 1,453,913
Personal Automobile [Member] | 2011 [Member]
Claims Development [Line Items]
Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance	133,192	$ 133,207	$ 133,142	$ 133,145	$ 133,218	$ 133,617	$ 133,229	$ 132,987	$ 131,678	$ 127,929
Total IBNR Plus Expected Development on Reported Claims	$ 69
Cumulative Number of Reported Claims | Claims	75
Personal Automobile [Member] | 2012 [Member]
Claims Development [Line Items]
Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance	$ 136,648	136,677	136,141	136,463	136,552	136,493	135,592	133,201	130,415
Total IBNR Plus Expected Development on Reported Claims	$ 194
Cumulative Number of Reported Claims | Claims	69
Personal Automobile [Member] | 2013 [Member]
Claims Development [Line Items]
Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance	$ 132,690	132,853	132,934	132,604	132,643	131,594	130,737	124,965
Total IBNR Plus Expected Development on Reported Claims	$ 136
Cumulative Number of Reported Claims | Claims	66
Personal Automobile [Member] | 2014 [Member]
Claims Development [Line Items]
Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance	$ 126,861	126,734	126,779	126,200	124,210	124,806	124,426
Total IBNR Plus Expected Development on Reported Claims	$ 219
Cumulative Number of Reported Claims | Claims	71
Personal Automobile [Member] | 2015 [Member]
Claims Development [Line Items]
Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance	$ 142,073	142,408	142,493	139,181	139,333	137,569
Total IBNR Plus Expected Development on Reported Claims	$ 499
Cumulative Number of Reported Claims | Claims	70
Personal Automobile [Member] | 2016 [Member]
Claims Development [Line Items]
Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance	$ 156,935	157,943	157,516	153,937	150,216
Total IBNR Plus Expected Development on Reported Claims	$ 1,349
Cumulative Number of Reported Claims | Claims	73
Personal Automobile [Member] | 2017 [Member]
Claims Development [Line Items]
Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance	$ 174,784	175,939	176,728	166,690
Total IBNR Plus Expected Development on Reported Claims	$ 2,567
Cumulative Number of Reported Claims | Claims	79
Personal Automobile [Member] | 2018 [Member]
Claims Development [Line Items]
Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance	$ 181,558	183,358	186,580
Total IBNR Plus Expected Development on Reported Claims	$ 5,837
Cumulative Number of Reported Claims | Claims	81
Personal Automobile [Member] | 2019 [Member]
Claims Development [Line Items]
Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance	$ 157,689	161,056
Total IBNR Plus Expected Development on Reported Claims	$ 10,276
Cumulative Number of Reported Claims | Claims	68
Personal Automobile [Member] | 2020 [Member]
Claims Development [Line Items]
Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance	$ 111,483
Total IBNR Plus Expected Development on Reported Claims	$ 25,587
Cumulative Number of Reported Claims | Claims	42
Homeowners [Member]
Claims Development [Line Items]
Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance	$ 657,279
Homeowners [Member] | 2011 [Member]
Claims Development [Line Items]
Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance	70,689	70,682	70,642	70,479	70,351	70,297	70,381	70,436	70,461	71,256
Total IBNR Plus Expected Development on Reported Claims	$ 0
Cumulative Number of Reported Claims | Claims	26
Homeowners [Member] | 2012 [Member]
Claims Development [Line Items]
Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance	$ 54,548	54,557	54,523	54,381	54,281	54,351	54,468	54,794	53,962
Total IBNR Plus Expected Development on Reported Claims	$ 0
Cumulative Number of Reported Claims | Claims	18
Homeowners [Member] | 2013 [Member]
Claims Development [Line Items]
Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance	$ 51,064	51,008	50,971	50,988	50,874	51,122	51,121	50,887
Total IBNR Plus Expected Development on Reported Claims	$ 0
Cumulative Number of Reported Claims | Claims	12
Homeowners [Member] | 2014 [Member]
Claims Development [Line Items]
Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance	$ 57,367	57,402	57,288	57,332	57,680	58,378	56,916
Total IBNR Plus Expected Development on Reported Claims	$ 0
Cumulative Number of Reported Claims | Claims	17
Homeowners [Member] | 2015 [Member]
Claims Development [Line Items]
Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance	$ 62,993	63,099	63,071	63,053	63,925	63,359
Total IBNR Plus Expected Development on Reported Claims	$ 28
Cumulative Number of Reported Claims | Claims	13
Homeowners [Member] | 2016 [Member]
Claims Development [Line Items]
Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance	$ 63,279	63,355	63,735	64,064	62,443
Total IBNR Plus Expected Development on Reported Claims	$ 25
Cumulative Number of Reported Claims | Claims	12
Homeowners [Member] | 2017 [Member]
Claims Development [Line Items]
Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance	$ 79,247	79,305	79,911	79,283
Total IBNR Plus Expected Development on Reported Claims	$ 342
Cumulative Number of Reported Claims | Claims	17
Homeowners [Member] | 2018 [Member]
Claims Development [Line Items]
Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance	$ 82,905	83,385	81,965
Total IBNR Plus Expected Development on Reported Claims	$ 838
Cumulative Number of Reported Claims | Claims	19
Homeowners [Member] | 2019 [Member]
Claims Development [Line Items]
Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance	$ 73,554	73,294
Total IBNR Plus Expected Development on Reported Claims	$ 1,830
Cumulative Number of Reported Claims | Claims	15
Homeowners [Member] | 2020 [Member]
Claims Development [Line Items]
Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance	$ 61,633
Total IBNR Plus Expected Development on Reported Claims	$ 6,235
Cumulative Number of Reported Claims | Claims	12
Commercial Automobile [Member]
Claims Development [Line Items]
Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance	$ 599,599
Commercial Automobile [Member] | 2011 [Member]
Claims Development [Line Items]
Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance	29,493	29,542	29,751	29,487	29,107	29,112	28,893	28,570	27,157	26,642
Total IBNR Plus Expected Development on Reported Claims	$ 17
Cumulative Number of Reported Claims | Claims	4
Commercial Automobile [Member] | 2012 [Member]
Claims Development [Line Items]
Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance	$ 31,930	31,896	31,803	31,648	31,278	31,435	30,606	27,720	26,557
Total IBNR Plus Expected Development on Reported Claims	$ 27
Cumulative Number of Reported Claims | Claims	8
Commercial Automobile [Member] | 2013 [Member]
Claims Development [Line Items]
Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance	$ 36,181	36,569	36,435	36,404	35,240	34,751	33,749	32,902
Total IBNR Plus Expected Development on Reported Claims	$ 64
Cumulative Number of Reported Claims | Claims	8
Commercial Automobile [Member] | 2014 [Member]
Claims Development [Line Items]
Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance	$ 49,308	49,168	49,284	48,213	47,326	44,544	42,760
Total IBNR Plus Expected Development on Reported Claims	$ 192
Cumulative Number of Reported Claims | Claims	11
Commercial Automobile [Member] | 2015 [Member]
Claims Development [Line Items]
Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance	$ 54,619	54,517	54,259	51,412	48,323	46,526
Total IBNR Plus Expected Development on Reported Claims	$ 452
Cumulative Number of Reported Claims | Claims	12
Commercial Automobile [Member] | 2016 [Member]
Claims Development [Line Items]
Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance	$ 66,894	67,127	65,905	57,353	54,302
Total IBNR Plus Expected Development on Reported Claims	$ 861
Cumulative Number of Reported Claims | Claims	13
Commercial Automobile [Member] | 2017 [Member]
Claims Development [Line Items]
Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance	$ 67,249	67,697	67,927	61,484
Total IBNR Plus Expected Development on Reported Claims	$ 2,823
Cumulative Number of Reported Claims | Claims	13
Commercial Automobile [Member] | 2018 [Member]
Claims Development [Line Items]
Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance	$ 82,313	81,396	79,307
Total IBNR Plus Expected Development on Reported Claims	$ 5,254
Cumulative Number of Reported Claims | Claims	15
Commercial Automobile [Member] | 2019 [Member]
Claims Development [Line Items]
Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance	$ 91,245	88,864
Total IBNR Plus Expected Development on Reported Claims	$ 15,356
Cumulative Number of Reported Claims | Claims	15
Commercial Automobile [Member] | 2020 [Member]
Claims Development [Line Items]
Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance	$ 90,367
Total IBNR Plus Expected Development on Reported Claims	$ 32,130
Cumulative Number of Reported Claims | Claims	13
Commercial MultiPeril [Member]
Claims Development [Line Items]
Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance	$ 539,251
Commercial MultiPeril [Member] | 2011 [Member]
Claims Development [Line Items]
Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance	38,478	38,434	38,160	38,105	38,270	37,385	37,576	35,942	35,411	33,054
Total IBNR Plus Expected Development on Reported Claims	$ 0
Cumulative Number of Reported Claims | Claims	7
Commercial MultiPeril [Member] | 2012 [Member]
Claims Development [Line Items]
Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance	$ 36,662	36,876	36,525	36,214	35,755	34,117	32,449	30,716	29,789
Total IBNR Plus Expected Development on Reported Claims	$ 0
Cumulative Number of Reported Claims | Claims	6
Commercial MultiPeril [Member] | 2013 [Member]
Claims Development [Line Items]
Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance	$ 37,495	37,453	37,365	37,981	37,205	37,292	35,679	35,683
Total IBNR Plus Expected Development on Reported Claims	$ 1
Cumulative Number of Reported Claims | Claims	6
Commercial MultiPeril [Member] | 2014 [Member]
Claims Development [Line Items]
Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance	$ 52,926	53,116	53,294	52,336	51,843	50,135	48,204
Total IBNR Plus Expected Development on Reported Claims	$ 119
Cumulative Number of Reported Claims | Claims	7
Commercial MultiPeril [Member] | 2015 [Member]
Claims Development [Line Items]
Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance	$ 45,366	45,873	45,104	44,728	43,874	42,070
Total IBNR Plus Expected Development on Reported Claims	$ 186
Cumulative Number of Reported Claims | Claims	6
Commercial MultiPeril [Member] | 2016 [Member]
Claims Development [Line Items]
Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance	$ 48,732	48,871	48,267	46,988	43,005
Total IBNR Plus Expected Development on Reported Claims	$ 857
Cumulative Number of Reported Claims | Claims	6
Commercial MultiPeril [Member] | 2017 [Member]
Claims Development [Line Items]
Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance	$ 54,812	56,517	56,043	56,185
Total IBNR Plus Expected Development on Reported Claims	$ 2,253
Cumulative Number of Reported Claims | Claims	7
Commercial MultiPeril [Member] | 2018 [Member]
Claims Development [Line Items]
Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance	$ 67,749	66,470	66,265
Total IBNR Plus Expected Development on Reported Claims	$ 6,243
Cumulative Number of Reported Claims | Claims	7
Commercial MultiPeril [Member] | 2019 [Member]
Claims Development [Line Items]
Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance	$ 73,836	71,865
Total IBNR Plus Expected Development on Reported Claims	$ 12,530
Cumulative Number of Reported Claims | Claims	7
Commercial MultiPeril [Member] | 2020 [Member]
Claims Development [Line Items]
Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance	$ 83,195
Total IBNR Plus Expected Development on Reported Claims	$ 26,981
Cumulative Number of Reported Claims | Claims	7
Workers Compensation [Member]
Claims Development [Line Items]
Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance	$ 468,718
Workers Compensation [Member] | 2011 [Member]
Claims Development [Line Items]
Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance	35,045	35,034	34,926	35,194	35,039	35,670	36,369	36,614	35,757	$ 32,490
Total IBNR Plus Expected Development on Reported Claims	$ 27
Cumulative Number of Reported Claims | Claims	5
Workers Compensation [Member] | 2012 [Member]
Claims Development [Line Items]
Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance	$ 36,014	35,932	35,954	36,468	37,163	37,926	38,827	39,516	$ 39,142
Total IBNR Plus Expected Development on Reported Claims	$ 69
Cumulative Number of Reported Claims | Claims	5
Workers Compensation [Member] | 2013 [Member]
Claims Development [Line Items]
Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance	$ 42,341	42,651	42,555	42,327	42,828	44,289	47,027	$ 46,325
Total IBNR Plus Expected Development on Reported Claims	$ 116
Cumulative Number of Reported Claims | Claims	6
Workers Compensation [Member] | 2014 [Member]
Claims Development [Line Items]
Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance	$ 47,849	47,693	47,540	48,537	49,288	51,553	$ 51,508
Total IBNR Plus Expected Development on Reported Claims	$ 193
Cumulative Number of Reported Claims | Claims	6
Workers Compensation [Member] | 2015 [Member]
Claims Development [Line Items]
Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance	$ 42,597	43,006	44,986	45,991	49,615	$ 53,332
Total IBNR Plus Expected Development on Reported Claims	$ 548
Cumulative Number of Reported Claims | Claims	5
Workers Compensation [Member] | 2016 [Member]
Claims Development [Line Items]
Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance	$ 44,098	44,969	47,883	49,802	$ 58,814
Total IBNR Plus Expected Development on Reported Claims	$ 840
Cumulative Number of Reported Claims | Claims	5
Workers Compensation [Member] | 2017 [Member]
Claims Development [Line Items]
Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance	$ 51,464	52,687	56,351	$ 60,450
Total IBNR Plus Expected Development on Reported Claims	$ 2,742
Cumulative Number of Reported Claims | Claims	5
Workers Compensation [Member] | 2018 [Member]
Claims Development [Line Items]
Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance	$ 52,514	55,291	$ 62,197
Total IBNR Plus Expected Development on Reported Claims	$ 4,114
Cumulative Number of Reported Claims | Claims	6
Workers Compensation [Member] | 2019 [Member]
Claims Development [Line Items]
Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance	$ 59,624	$ 60,998
Total IBNR Plus Expected Development on Reported Claims	$ 7,825
Cumulative Number of Reported Claims | Claims	6
Workers Compensation [Member] | 2020 [Member]
Claims Development [Line Items]
Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance	$ 57,172
Total IBNR Plus Expected Development on Reported Claims	$ 19,283
Cumulative Number of Reported Claims | Claims	5

Liability for Losses and Loss_6

Liability for Losses and Loss Expenses - Summary of Cumulative Claim Frequency and Total of Incurred but not Reported Claims plus Expected Development on Reported Claims Incurred (Detail) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Personal Automobile [Member]
Claims Development [Line Items]
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance	$ 1,342,956
All outstanding liabilities before 2011, net of reinsurance	647
Liabilities for claims and claims adjustment expenses, net of reinsurance	111,604
Personal Automobile [Member] | 2011 [Member]
Claims Development [Line Items]
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance	133,002	$ 132,835	$ 132,777	$ 132,714	$ 132,479	$ 131,319	$ 127,545	$ 121,621	$ 110,249	$ 87,191
Personal Automobile [Member] | 2012 [Member]
Claims Development [Line Items]
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance	136,165	136,137	135,132	134,581	133,428	130,862	124,652	111,941	87,517
Personal Automobile [Member] | 2013 [Member]
Claims Development [Line Items]
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance	132,215	131,642	131,326	130,026	125,946	120,118	109,051	84,241
Personal Automobile [Member] | 2014 [Member]
Claims Development [Line Items]
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance	125,619	124,926	123,815	120,491	114,893	104,736	85,377
Personal Automobile [Member] | 2015 [Member]
Claims Development [Line Items]
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance	140,028	139,121	135,027	128,395	116,303	93,611
Personal Automobile [Member] | 2016 [Member]
Claims Development [Line Items]
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance	153,521	151,159	143,321	129,507	102,433
Personal Automobile [Member] | 2017 [Member]
Claims Development [Line Items]
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance	166,099	159,879	142,372	111,964
Personal Automobile [Member] | 2018 [Member]
Claims Development [Line Items]
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance	163,036	150,175	115,585
Personal Automobile [Member] | 2019 [Member]
Claims Development [Line Items]
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance	127,187	103,101
Personal Automobile [Member] | 2020 [Member]
Claims Development [Line Items]
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance	66,084
Homeowners [Member]
Claims Development [Line Items]
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance	639,055
All outstanding liabilities before 2011, net of reinsurance	99
Liabilities for claims and claims adjustment expenses, net of reinsurance	18,323
Homeowners [Member] | 2011 [Member]
Claims Development [Line Items]
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance	70,693	70,692	70,692	70,648	70,626	70,541	70,351	70,125	69,345	57,588
Homeowners [Member] | 2012 [Member]
Claims Development [Line Items]
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance	54,553	54,557	54,557	54,356	54,317	54,298	54,028	53,619	46,566
Homeowners [Member] | 2013 [Member]
Claims Development [Line Items]
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance	50,965	50,967	50,902	51,043	50,478	50,210	49,410	40,949
Homeowners [Member] | 2014 [Member]
Claims Development [Line Items]
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance	57,336	57,243	56,995	57,195	56,990	56,255	45,823
Homeowners [Member] | 2015 [Member]
Claims Development [Line Items]
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance	62,943	62,844	62,590	62,204	61,542	51,885
Homeowners [Member] | 2016 [Member]
Claims Development [Line Items]
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance	63,162	63,144	62,760	61,145	50,125
Homeowners [Member] | 2017 [Member]
Claims Development [Line Items]
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance	78,127	78,006	77,663	67,077
Homeowners [Member] | 2018 [Member]
Claims Development [Line Items]
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance	80,905	79,892	70,385
Homeowners [Member] | 2019 [Member]
Claims Development [Line Items]
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance	69,145	58,074
Homeowners [Member] | 2020 [Member]
Claims Development [Line Items]
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance	51,226
Commercial Automobile [Member]
Claims Development [Line Items]
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance	457,400
All outstanding liabilities before 2011, net of reinsurance	244
Liabilities for claims and claims adjustment expenses, net of reinsurance	142,443
Commercial Automobile [Member] | 2011 [Member]
Claims Development [Line Items]
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance	29,476	29,474	29,102	28,836	28,758	28,014	26,973	24,267	19,106	13,876
Commercial Automobile [Member] | 2012 [Member]
Claims Development [Line Items]
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance	31,263	31,228	31,104	30,402	29,873	27,417	23,718	20,240	13,642
Commercial Automobile [Member] | 2013 [Member]
Claims Development [Line Items]
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance	36,092	36,106	36,004	34,083	31,053	26,879	23,557	16,306
Commercial Automobile [Member] | 2014 [Member]
Claims Development [Line Items]
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance	48,603	48,418	47,290	44,374	39,436	31,089	22,707
Commercial Automobile [Member] | 2015 [Member]
Claims Development [Line Items]
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance	51,992	51,605	48,261	41,678	35,342	23,875
Commercial Automobile [Member] | 2016 [Member]
Claims Development [Line Items]
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance	60,485	57,237	48,837	38,237	27,033
Commercial Automobile [Member] | 2017 [Member]
Claims Development [Line Items]
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance	57,128	49,703	40,213	28,707
Commercial Automobile [Member] | 2018 [Member]
Claims Development [Line Items]
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance	57,451	47,941	33,862
Commercial Automobile [Member] | 2019 [Member]
Claims Development [Line Items]
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance	53,026	36,948
Commercial Automobile [Member] | 2020 [Member]
Claims Development [Line Items]
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance	31,884
Commercial MultiPeril [Member]
Claims Development [Line Items]
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance	422,326
All outstanding liabilities before 2011, net of reinsurance	612
Liabilities for claims and claims adjustment expenses, net of reinsurance	117,537
Commercial MultiPeril [Member] | 2011 [Member]
Claims Development [Line Items]
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance	38,457	38,413	38,366	38,240	37,759	36,722	33,526	30,286	24,767	18,773
Commercial MultiPeril [Member] | 2012 [Member]
Claims Development [Line Items]
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance	36,399	36,329	35,909	35,331	33,327	29,370	26,634	23,384	16,666
Commercial MultiPeril [Member] | 2013 [Member]
Claims Development [Line Items]
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance	37,436	37,333	36,321	35,104	33,614	29,159	26,216	19,875
Commercial MultiPeril [Member] | 2014 [Member]
Claims Development [Line Items]
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance	52,103	51,615	50,017	47,021	40,936	35,520	27,920
Commercial MultiPeril [Member] | 2015 [Member]
Claims Development [Line Items]
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance	44,090	42,849	39,162	34,323	29,419	21,837
Commercial MultiPeril [Member] | 2016 [Member]
Claims Development [Line Items]
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance	43,435	41,193	34,612	29,402	19,660
Commercial MultiPeril [Member] | 2017 [Member]
Claims Development [Line Items]
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance	46,361	42,691	36,926	27,399
Commercial MultiPeril [Member] | 2018 [Member]
Claims Development [Line Items]
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance	48,050	42,296	30,597
Commercial MultiPeril [Member] | 2019 [Member]
Claims Development [Line Items]
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance	41,266	28,210
Commercial MultiPeril [Member] | 2020 [Member]
Claims Development [Line Items]
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance	34,729
Workers Compensation [Member]
Claims Development [Line Items]
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance	361,612
All outstanding liabilities before 2011, net of reinsurance	3,343
Liabilities for claims and claims adjustment expenses, net of reinsurance	110,449
Workers Compensation [Member] | 2011 [Member]
Claims Development [Line Items]
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance	34,261	34,109	33,963	33,577	33,067	32,394	31,905	27,517	21,450	$ 9,157
Workers Compensation [Member] | 2012 [Member]
Claims Development [Line Items]
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance	34,691	34,622	34,460	34,177	33,196	31,244	28,812	22,963	$ 11,097
Workers Compensation [Member] | 2013 [Member]
Claims Development [Line Items]
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance	40,827	40,361	39,617	38,877	36,351	32,783	26,043	$ 13,052
Workers Compensation [Member] | 2014 [Member]
Claims Development [Line Items]
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance	44,403	43,866	42,465	40,393	36,284	28,513	$ 13,932
Workers Compensation [Member] | 2015 [Member]
Claims Development [Line Items]
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance	38,596	37,936	36,929	34,192	27,531	$ 13,071
Workers Compensation [Member] | 2016 [Member]
Claims Development [Line Items]
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance	41,208	40,570	37,178	30,344	$ 14,709
Workers Compensation [Member] | 2017 [Member]
Claims Development [Line Items]
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance	42,954	39,684	31,990	$ 15,581
Workers Compensation [Member] | 2018 [Member]
Claims Development [Line Items]
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance	37,072	31,928	$ 17,644
Workers Compensation [Member] | 2019 [Member]
Claims Development [Line Items]
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance	33,009	$ 16,939
Workers Compensation [Member] | 2020 [Member]
Claims Development [Line Items]
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance	$ 14,591

Liability for Losses and Loss_7

Liability for Losses and Loss Expenses - Reconciliation of Net Incurred and Paid Claims Development Tables to Liability for Claims and Claim Adjustment Expenses (Detail) - USD ($)	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Claims Development [Line Items]
Net outstanding liabilities	$ 518,115,000
Reinsurance recoverable	388,308,000
Unallocated loss adjustment expenses	55,584,000
Gross liability for unpaid losses and loss expenses	962,007,437	$ 869,673,849	$ 814,665,224	$ 676,671,727
Personal Automobile [Member]
Claims Development [Line Items]
Net outstanding liabilities	111,604,000
Reinsurance recoverable	117,575,000
Homeowners [Member]
Claims Development [Line Items]
Net outstanding liabilities	18,323,000
Reinsurance recoverable	10,597,000
Commercial Automobile [Member]
Claims Development [Line Items]
Net outstanding liabilities	142,443,000
Reinsurance recoverable	90,436,000
Commercial MultiPeril [Member]
Claims Development [Line Items]
Net outstanding liabilities	117,537,000
Reinsurance recoverable	75,801,000
Workers Compensation [Member]
Claims Development [Line Items]
Net outstanding liabilities	110,449,000
Reinsurance recoverable	86,479,000
Other [Member]
Claims Development [Line Items]
Net outstanding liabilities	17,759,000
Reinsurance recoverable	$ 7,420,000

Liability for Losses and Loss_8

Liability for Losses and Loss Expenses - Supplementary Information About Average Historical Claims Duration (Detail)	Dec. 31, 2020
Personal Automobile [Member]
Claims Development [Line Items]
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance, Year 1	64.60%
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance, Year 2	17.10%
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance, Year 3	8.60%
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance, Year 4	4.40%
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance, Year 5	2.50%
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance, Year 6	0.80%
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance, Year 7	0.30%
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance, Year 8	0.40%
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance, Year 9	0.00%
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance, Year 10	0.10%
Homeowners [Member]
Claims Development [Line Items]
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance, Year 1	82.00%
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance, Year 2	15.20%
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance, Year 3	1.20%
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance, Year 4	0.40%
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance, Year 5	0.20%
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance, Year 6	0.10%
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance, Year 7	0.20%
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance, Year 8	0.00%
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance, Year 9	0.00%
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance, Year 10	0.00%
Commercial Automobile [Member]
Claims Development [Line Items]
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance, Year 1	42.50%
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance, Year 2	18.30%
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance, Year 3	13.50%
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance, Year 4	11.10%
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance, Year 5	6.10%
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance, Year 6	2.50%
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance, Year 7	0.80%
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance, Year 8	0.40%
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance, Year 9	0.70%
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance, Year 10	0.00%
Commercial MultiPeril [Member]
Claims Development [Line Items]
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance, Year 1	46.40%
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance, Year 2	17.10%
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance, Year 3	10.20%
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance, Year 4	10.00%
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance, Year 5	6.90%
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance, Year 6	3.40%
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance, Year 7	1.60%
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance, Year 8	0.60%
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance, Year 9	0.20%
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance, Year 10	0.10%
Workers Compensation [Member]
Claims Development [Line Items]
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance, Year 1	29.90%
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance, Year 2	31.60%
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance, Year 3	15.20%
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance, Year 4	8.10%
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance, Year 5	3.50%
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance, Year 6	2.20%
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance, Year 7	1.30%
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance, Year 8	0.90%
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance, Year 9	0.30%
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance, Year 10	0.40%

Borrowings - Additional Informa

Borrowings - Additional Information (Detail) - USD ($)	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018	Aug. 01, 2020
Line of Credit Facility [Line Items]
Line of credit expiration month and year	2020-08
Line of credit, interest rate description	interest rates equal to the then-current LIBOR rate plus 2.00%
Interest paid	$ 250,000	$ 250,000	$ 250,000
Manufacturers and Traders Trust Company [Member]
Line of Credit Facility [Line Items]
Line of credit facility remaining borrowing capacity				$ 20,000,000
FHLB of Pittsburgh [Member] | Atlantic States [Member]
Line of Credit Facility [Line Items]
Right to request for extension of credit agreement with Manufacturers and Traders Trust Company	1,330,109
Outstanding advances	35,000,000
Federal home loan bank, fixed rate advances	35,000,000
Pre-Payment of Penalty	$ 176,000
Revolving Credit Facility [Member] | Manufacturers and Traders Trust Company [Member]
Line of Credit Facility [Line Items]
Right to request for extension of credit agreement with Manufacturers and Traders Trust Company				$ 20,000,000
Debt instrument stated interest rate			2.00%
Lines of Credit [Member] | FHLB of Pittsburgh [Member] | Atlantic States [Member]
Line of Credit Facility [Line Items]
Interest rate on advances	1.74%
Subordinated Debentures [Member]
Line of Credit Facility [Line Items]
Debt instrument stated interest rate	5.00%
Subordinated Debentures [Member] | West Bend Mutual Insurance Company [Member]
Line of Credit Facility [Line Items]
Surplus note	$ 5,000,000
Subordinated Debentures [Member] | Lines of Credit [Member] | FHLB of Pittsburgh [Member] | March 2021 Due [Member]
Line of Credit Facility [Line Items]
Outstanding advances	$ 50,000,000
Interest rate on advances	0.83%

Borrowings - Amount of FHLB of

Borrowings - Amount of FHLB of Indianapolis/Pittsburgh Stock Purchased, Collateral Pledged and Assets Related to MICO's/Atlantic States Agreement (Detail) - Atlantic States [Member] - FHLB of Pittsburgh [Member]	Dec. 31, 2020USD ($)
Amount of FHLB of Indianapolis/Pittsburgh stock purchased, collateral pledged and assets related to MICO's/Atlantic States Agreement
FHLB stock purchased and owned	$ 3,690,100
Collateral pledged, at par	85,915,094
Borrowing capacity currently available	$ 1,330,109

Borrowings - Amount of FHLB o_2

Borrowings - Amount of FHLB of Indianapolis/Pittsburgh Stock Purchased, Collateral Pledged and Assets Related to MICO's/Atlantic States Agreement (Parenthetical) (Detail)	Dec. 31, 2020USD ($)
FHLB of Pittsburgh [Member] | Atlantic States [Member]
Line of Credit Facility [Line Items]
Collateral Pledged at carrying value	$ 87,466,236

Reinsurance - Additional Inform

Reinsurance - Additional Information (Detail)	12 Months Ended
	Dec. 31, 2020USD ($)
Ceded Credit Risk [Line Items]
Percentage of reinsurer coverage	20.00%
Loss Reinsurance Agreement Contracts Retention Amount	$ 2,000,000
Third Party Reinsurance [Member]
Ceded Credit Risk [Line Items]
Percentage of accumulation of losses	100.00%
Catastrophe reinsurance, set retention amount	$ 15,000,000
Maximum amount of loss coverage under reinsurance agreement of property catastrophe	$ 185,000,000
Donegal Mutual [Member]
Ceded Credit Risk [Line Items]
Percentage of accumulation of losses	100.00%
Catastrophe reinsurance, set retention amount	$ 2,000,000
Maximum amount of loss coverage under reinsurance agreement of property catastrophe	13,000,000
Additional coverage amount	$ 5,000,000

Reinsurance - Ceded Reinsurance

Reinsurance - Ceded Reinsurance Transactions with Unaffiliated Reinsurers (Detail) - USD ($)	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Ceded Credit Risk [Line Items]
Premiums written	$ 383,612,503	$ 322,204,999	$ 326,545,370
Premiums earned	356,669,937	314,859,014	326,198,234
Prepaid reinsurance premiums	169,418,333	142,475,767
Unaffiliated Entity [Member]
Ceded Credit Risk [Line Items]
Premiums written	34,165,635	36,941,997	50,160,604
Premiums earned	35,358,765	39,732,282	51,266,000
Losses and loss expenses	9,835,268	33,615,819	50,652,202
Prepaid reinsurance premiums	5,874,859	7,067,989	10,108,269
Liability for losses and loss expenses	$ 133,158,907	$ 139,694,097	$ 137,904,346

Reinsurance - Total Ceded Reins

Reinsurance - Total Ceded Reinsurance Transactions with both Affiliated and Unaffiliated Reinsurers (Detail) - USD ($)	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Ceded Credit Risk [Line Items]
Premiums earned	$ 356,669,937	$ 314,859,014	$ 326,198,234
Prepaid reinsurance premiums	169,418,333	142,475,767
Affiliated Entity and Unaffiliated Entity [Member]
Ceded Credit Risk [Line Items]
Premiums earned	356,669,937	314,859,014	326,198,234
Losses and loss expenses	231,771,575	240,241,845	246,223,074
Prepaid reinsurance premiums	169,418,333	142,475,767	135,379,777
Liability for losses and loss expenses	$ 404,818,480	$ 362,768,427	$ 339,267,525

Reinsurance - Amounts Represent

Reinsurance - Amounts Represent Effect of Reinsurance on Premiums Written (Detail) - USD ($)	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Premiums Written, Net [Abstract]
Direct	$ 586,681,839	$ 589,572,526	$ 594,078,723
Assumed	539,070,557	485,233,762	476,482,451
Ceded	(383,612,503)	(322,204,999)	(326,545,370)
Net	$ 742,139,893	$ 752,601,289	$ 744,015,804

Reinsurance - Amounts Represe_2

Reinsurance - Amounts Represent Effect of Reinsurance on Premiums Earned (Detail) - USD ($)	3 Months Ended								12 Months Ended
	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Reinsurance Disclosures [Abstract]
Direct									$ 584,537,580	$ 591,101,804	$ 593,976,241
Assumed									514,172,696	479,835,610	473,512,866
Ceded									(356,669,937)	(314,859,014)	(326,198,234)
Net premiums earned	$ 185,488,060	$ 184,925,733	$ 184,373,768	$ 187,252,778	$ 189,420,787	$ 189,821,058	$ 188,763,313	$ 188,073,242	$ 742,040,339	$ 756,078,400	$ 741,290,873
Percentage of assumed premiums earned to net premiums earned									69.30%	63.50%	63.90%

Income Taxes - Additional Infor

Income Taxes - Additional Information (Detail) - USD ($)	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Mar. 31, 2020	Dec. 31, 2017
Operating Loss Carryforwards [Line Items]
Effective tax rate computed at the statutory federal rate	21.00%
Reclassification of an alternative minimum tax credit carry forward				$ 8,500,000
Net operating loss carryback period	2 years
Operating loss carryforwards expiration period	2026
Other deferred tax assets, net	$ 26,700,000	$ 26,100,000
Income taxes receivable	3,089,369		$ 1,600,000
Parent Company [Member]
Operating Loss Carryforwards [Line Items]
Valuation allowance related to the portion of operating loss carryforwards	7.5	$ 7.9
Earliest Tax Year [Member]
Operating Loss Carryforwards [Line Items]
Tax years open for examination		2016
Latest Tax Year [Member]
Operating Loss Carryforwards [Line Items]
Tax years open for examination		2020
Le Mars [Member]
Operating Loss Carryforwards [Line Items]
Operating loss carryforwards	$ 495,435
Operating loss carryforwards expiration period	2022
Operating loss carryforwards annual limitations in amount on use	$ 376,000

Income Taxes - Provision for In

Income Taxes - Provision for Income Tax (Benefit) Expense (Detail) - USD ($)	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Components of Income Tax Expense (Benefit), Continuing Operations [Abstract]
Current federal income tax	$ 10,450,803	$ 8,454,358	$ (11,296,704)
Deferred federal income tax	6,448	649,928	(4,179,805)
Federal income tax expense (benefit)	10,457,251	9,104,286	(15,476,509)
Pennsylvania income tax		825,000
Income tax expense (benefit)	$ 10,457,251	$ 9,929,286	$ (15,476,509)

Income Taxes - Reconciliation o

Income Taxes - Reconciliation of Federal Income Tax Rate (Detail) - USD ($)	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Effective Income Tax Rate Reconciliation, Percent [Abstract]
Income (loss) before income taxes	$ 63,272,503	$ 57,081,030	$ (48,236,849)
Computed "expected" taxes	13,287,226	11,987,016	(10,129,738)
Tax-exempt interest	(1,468,806)	(1,325,197)	(1,521,090)
Proration	395,663	357,044	405,204
Dividends received deduction	(113,845)	(1,913,238)	(99,726)
Net operating loss carryback	(1,640,084)		(4,210,523)
Tax benefit on exercise of options	(302,901)	(64,765)	(25,938)
Other, net	299,998	236,676	105,302
Pennsylvania income tax, net of federal benefit		651,750
Income tax expense (benefit)	$ 10,457,251	$ 9,929,286	$ (15,476,509)

Income Taxes - Schedule of Defe

Income Taxes - Schedule of Deferred Tax Assets and Deferred Tax Liabilities (Detail) - USD ($)	Dec. 31, 2020	Dec. 31, 2019
Deferred tax assets:
Unearned premium	$ 15,481,602	$ 15,482,366
Loss reserves	8,808,342	7,820,683
Net operating loss carryforward	104,041	200,942
Other	2,342,967	2,603,155
Total gross deferred tax assets	34,587,286	33,627,137
Less valuation allowance	(7,850,334)	(7,538,024)
Net deferred tax assets	26,736,952	26,089,113
Deferred tax liabilities:
Deferred policy acquisition costs	12,422,961	12,449,820
Loss reserve transition adjustment	1,440,793	1,733,056
Other	7,190,085	3,391,926
Total gross deferred tax liabilities	21,053,839	17,574,802
Net deferred tax asset	5,683,113	8,514,311
Parent Company [Member]
Deferred tax assets:
Net state operating loss carryforward	$ 7,850,334	$ 7,519,991

Stockholders' Equity - Addition

Stockholders' Equity - Additional Information (Detail) - shares	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Jul. 18, 2013
Equity, Class of Treasury Stock [Line Items]
Minimum percentage of class A common stock declared dividend excess over class B dividend	10.00%
Class A Common Stock [Member]
Equity, Class of Treasury Stock [Line Items]
Treasury stock	3,002,588
Class B Common Stock [Member]
Equity, Class of Treasury Stock [Line Items]
Minimum percentage of class A common stock declared dividend excess over class B dividend	10.00%
Treasury stock		72,465
Stock Repurchase Program Two [Member] | Class A Common Stock [Member]
Equity, Class of Treasury Stock [Line Items]
Authority to purchase shares			500,000
Common stock shares purchased	0	57,658

Stock Compensation Plans - Addi

Stock Compensation Plans - Additional Information (Detail) - USD ($)	Jan. 01, 2021	Jan. 02, 2020	Jan. 02, 2019	Jan. 02, 2018	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2015	Dec. 31, 2011
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Compensation expense in stock compensation plans					$ 1,100,000	$ 1,400,000	$ 1,700,000
Income tax benefit of stock compensation plans					229,698	288,901	354,412
Unrecognized compensation expense related to nonvested share-based compensation granted under the plan					$ 1,600,000	2,000,000
Weighted average period of unrecognized compensation expense					1 year 10 months 24 days
Cash from option exercises					$ 17,500,000	2,900,000	1,100,000
Tax benefit for tax deductions from option exercises					$ 302,901	$ 64,765	$ 25,938
Equity Incentive Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Exercisable period of stock options					5 years
Restricted shares issued to directors						500
Weighted-average grant date fair value of options granted					$ 1.15	$ 1.15	$ 1.66
Fair value of risk-free interest rate					0.20%	1.64%	2.68%
Expected life					3 years	3 years	3 years
Expected volatility					20.00%	17.00%	22.00%
Expected dividend yield					4.00%	4.00%	4.00%
Shares available for future option grants					3
Equity Incentive Plan [Member] | Class A Common Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common stock available for issuance to employees of subsidiaries and affiliates under identical plan						4,500,000
Common stock available for issuance to directors and those of the subsidiaries and affiliates under identical plan						500,000
Equity Incentive Plan [Member] | Restricted Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Additional issued shares		8,500	8,500	8,500
Employee Stock Purchase Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Exercisable period of stock options					10 years
Common stock available for issuance to employees/directors and those of the subsidiaries and affiliates									300,000
Percentage of purchase price of shares					85.00%		85.00%
Employee Stock Purchase Plan [Member] | Subsequent Event [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Additional issued shares	23,336
Shares issued during period price per share	$ 11.96
Agency Stock Purchase Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Additional issued shares					101,647	110,836	117,935
Common stock available for issuance to employees/directors and those of the subsidiaries and affiliates								350,000
Percentage of purchase price of shares					90.00%
Investment					$ 12,000
Number of trading days of subscription period					10 days
2019 Amendment Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common stock available for issuance to employees/directors and those of the subsidiaries and affiliates						500,000

Stock Compensation Plans - Info

Stock Compensation Plans - Information Regarding Activity in Stock Option Plans (Detail) - $ / shares	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Retirement Benefits [Abstract]
Number of Options, Outstanding Beginning Balance	10,435,990	10,024,862	9,264,462
Number of Options, Granted	935,099	1,045,400	1,063,000
Number of Options, Exercised	(1,294,606)	(217,498)	(79,961)
Number of Options, Forfeited	(303,908)	(416,774)	(222,639)
Number of Options, Expired	(78,223)
Number of Options, Outstanding Ending Balance	9,694,352	10,435,990	10,024,862
Number of Options, Exercisable	7,786,934	8,449,389	7,936,659
Weighted-Average Exercise Price Per Share, Outstanding Beginning Balance	$ 15.09	$ 15.09	$ 15.26
Weighted-Average Exercise Price Per Share, Granted	14.45	14.97	13.69
Weighted-Average Exercise Price Per Share, Exercised	13.52	13.23	13.74
Weighted-Average Exercise Price Per Share, Forfeited	15.23	15.88	16
Weighted-Average Exercise Price Per Share, Outstanding Ending Balance	15.24	15.09	15.09
Weighted-Average Exercise Price Per Share, Exercisable	15.42	$ 15.13	$ 15.02
Weighted-Average Exercise Price Per Share, Expired	$ 13.64

Stock Compensation Plans - Summ

Stock Compensation Plans - Summary of Information about Stock Options Outstanding (Detail) - $ / shares	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of Options Outstanding	9,694,352
Number of Options, Exercisable	7,786,934	8,449,389	7,936,659
July 27, 2011 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Exercise Price	$ 12.50
Number of Options Outstanding	743,934
Weighted-Average Remaining Contractual Life	1 year
Number of Options, Exercisable	743,934
December 20, 2012 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Exercise Price	$ 14.50
Number of Options Outstanding	981,759
Weighted-Average Remaining Contractual Life	2 years
Number of Options, Exercisable	981,759
December 19, 2013 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Exercise Price	$ 15.90
Number of Options Outstanding	1,939,970
Weighted-Average Remaining Contractual Life	3 years
Number of Options, Exercisable	1,939,970
December 18, 2014 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Exercise Price	$ 15.80
Number of Options Outstanding	1,235,081
Weighted-Average Remaining Contractual Life	4 years
Number of Options, Exercisable	1,235,081
December 15, 2016 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Exercise Price	$ 16.48
Number of Options Outstanding	1,165,308
Weighted-Average Remaining Contractual Life	1 year
Number of Options, Exercisable	1,165,308
December 21, 2017 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Exercise Price	$ 17.60
Number of Options Outstanding	763,633
Weighted-Average Remaining Contractual Life	2 years
Number of Options, Exercisable	763,633
December 20, 2018 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Exercise Price	$ 13.69
Number of Options Outstanding	910,367
Weighted-Average Remaining Contractual Life	3 years
Number of Options, Exercisable	606,851
March 4, 2019 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Exercise Price	$ 13.51
Number of Options Outstanding	10,000
Weighted-Average Remaining Contractual Life	3 years 2 months 12 days
Number of Options, Exercisable	6,666
December 19, 2019 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Exercise Price	$ 14.98
Number of Options Outstanding	1,031,300
Weighted-Average Remaining Contractual Life	4 years
Number of Options, Exercisable	343,732
December 17, 2020 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Exercise Price	$ 14.43
Number of Options Outstanding	913,000
Weighted-Average Remaining Contractual Life	5 years

Stock Compensation Plans - Su_2

Stock Compensation Plans - Summary of Plan Activity (Detail) - $ / shares	Jul. 01, 2020	Jan. 01, 2020	Jul. 01, 2019	Jan. 01, 2019	Jul. 01, 2018	Jan. 01, 2018
Issue Date One [Member]
Employee Stock Ownership Plan (ESOP) Disclosures [Line Items]
Shares Issued, Price						$ 13.34
Shares Issued, Shares						20,662
Issue Date Two [Member]
Employee Stock Ownership Plan (ESOP) Disclosures [Line Items]
Shares Issued, Price					$ 11.57
Shares Issued, Shares					27,802
Issue Date Three [Member]
Employee Stock Ownership Plan (ESOP) Disclosures [Line Items]
Shares Issued, Price				$ 11.60
Shares Issued, Shares				24,834
Issue Date Four [Member]
Employee Stock Ownership Plan (ESOP) Disclosures [Line Items]
Shares Issued, Price			$ 12.24
Shares Issued, Shares			22,926
Issue Date Five [Member]
Employee Stock Ownership Plan (ESOP) Disclosures [Line Items]
Shares Issued, Price		$ 12.28
Shares Issued, Shares		20,424
Issue Date Six [Member]
Employee Stock Ownership Plan (ESOP) Disclosures [Line Items]
Shares Issued, Price	$ 12.09
Shares Issued, Shares	22,662

Statutory Net Income, Capital_3

Statutory Net Income, Capital and Surplus and Dividend Restrictions - Statutory Net Income, Capital and Surplus and Dividend (Detail) - USD ($)	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Statutory Accounting Practices [Line Items]
Statutory capital and surplus	$ 458,407,568	$ 418,449,596	$ 364,518,536
Statutory net income (loss)	48,282,517	44,680,696	(33,246,417)
Atlantic States [Member]
Statutory Accounting Practices [Line Items]
Statutory capital and surplus	279,796,696	259,030,868	230,736,313
Statutory unassigned (deficit) surplus	175,777,393	155,909,822	140,713,118
Statutory net income (loss)	20,735,871	22,282,231	(23,458,516)
Southern [Member]
Statutory Accounting Practices [Line Items]
Statutory capital and surplus	57,142,228	54,405,568	45,355,785
Statutory unassigned (deficit) surplus	300,409	(2,375,794)	(6,346,270)
Statutory net income (loss)	4,350,677	5,061,477	(9,822,457)
Peninsula [Member]
Statutory Accounting Practices [Line Items]
Statutory capital and surplus	49,285,069	39,244,570	32,717,996
Statutory unassigned (deficit) surplus	30,975,869	20,936,805	14,415,949
Statutory net income (loss)	10,955,796	7,360,378	(6,316,130)
MICO [Member]
Statutory Accounting Practices [Line Items]
Statutory capital and surplus	72,183,575	65,768,590	55,708,442
Statutory unassigned (deficit) surplus	45,247,698	38,910,008	28,949,919
Statutory net income (loss)	$ 12,240,173	$ 9,976,610	$ 6,350,686

Statutory Net Income, Capital_4

Statutory Net Income, Capital and Surplus and Dividend Restrictions - Additional Information (Detail) $ in Millions	Dec. 31, 2020USD ($)
Statutory Accounting Practices [Line Items]
Amounts available for distribution as dividends	$ 51.4
Atlantic States [Member]
Statutory Accounting Practices [Line Items]
Amounts available for distribution as dividends	28
Southern [Member]
Statutory Accounting Practices [Line Items]
Amounts available for distribution as dividends	300,000
Peninsula [Member]
Statutory Accounting Practices [Line Items]
Amounts available for distribution as dividends	10.9
MICO [Member]
Statutory Accounting Practices [Line Items]
Amounts available for distribution as dividends	$ 12.2

Reconciliation of Statutory F_3

Reconciliation of Statutory Filings to Amounts Reported in the Consolidated Financial Statements - Reconciliations of Statutory Net (loss) Income and Capital and Surplus (Detail) - USD ($)	3 Months Ended								12 Months Ended
	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Disclosure Text Block [Abstract]
Statutory net income (loss) of insurance subsidiaries									$ 48,282,517	$ 44,680,696	$ (33,246,417)
Increases (decreases):
Deferred policy acquisition costs									(127,901)	(1,330,268)	325,267
Deferred federal income taxes									(6,448)	639,284	4,179,807
Salvage and subrogation recoverable									713,400	207,000	2,061,600
Consolidating eliminations and adjustments									(9,516,984)	(11,048,314)	(16,013,971)
Parent-only net income									13,470,668	14,003,346	9,933,374
Net income (loss)	$ 14,568,355	$ 11,836,998	$ 22,678,778	$ 3,731,121	$ 14,153,747	$ 5,186,379	$ 4,788,454	$ 23,023,164	52,815,252	47,151,744	(32,760,340)
Statutory Capital And Surplus Of Insurance Subsidiaries [Abstract]
Statutory capital and surplus of insurance subsidiaries	458,407,568				418,449,596				458,407,568	418,449,596	364,518,536
Deferred policy acquisition costs	59,156,958				59,284,859				59,156,958	59,284,859	60,615,127	$ 60,289,860
Deferred federal income taxes	(18,586,428)				(15,477,843)				(18,586,428)	(15,477,843)	(20,094,374)
Salvage and subrogation recoverable	20,958,600				20,245,200				20,958,600	20,245,200	20,038,200
Non-admitted assets and other adjustments, net	1,315,378				1,727,754				1,315,378	1,727,754	1,904,083
Fixed maturities	15,309,610				(326,795)				15,309,610	(326,795)	(16,528,367)
Parent-only equity and other adjustments	(18,787,566)				(32,887,252)				(18,787,566)	(32,887,252)	(11,583,304)
Total stockholders' equity	$ 517,774,120				$ 451,015,519				$ 517,774,120	$ 451,015,519	$ 398,869,901	$ 448,696,104

Supplementary Cash Flow Infor_3

Supplementary Cash Flow Information - Net Income Taxes and Interest Paid (Detail) - USD ($)	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Supplemental Cash Flow Elements [Abstract]
Income taxes	$ 12,800,000	$ (9,827,433)	$ (3,290,247)
Interest	$ 1,191,800	$ 321,585	$ 1,280,352

Earnings Per Share - Additional

Earnings Per Share - Additional Information (Detail)	12 Months Ended
	Dec. 31, 2020shares
Earnings Per Share [Abstract]
Minimum percentage of class A common stock declared dividend excess over class B dividend	10.00%
Options excluded from diluted earnings per share	6,135,292

Earnings Per Share - Summary of

Earnings Per Share - Summary of Reconciliation of Numerators and Denominators Used in Basic and Diluted Per Share Computations (Detail) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Class A Common Stock [Member]
Numerator:
Allocation of net income (loss)									$ 43,609	$ 38,718	$ (26,691)
Denominator:
Weighted-average shares outstanding									23,707	22,986	22,705
Basic earnings (loss) per share	$ 0.50	$ 0.41	$ 0.80	$ 0.13	$ 0.50	$ 0.19	$ 0.17	$ 0.82	$ 1.84	$ 1.68	$ (1.18)
Numerator:
Allocation of net income (loss)									$ 43,609	$ 38,718	$ (26,691)
Denominator:
Number of shares used in basic computation									23,707	22,986	22,705
Weighted-average shares effect of dilutive securities
Director and employee stock options									180	211
Number of shares used in diluted computation									23,887	23,197	22,705
Diluted earnings (loss) per share	0.49	0.41	0.79	0.13	0.50	0.18	0.17	0.82	$ 1.83	$ 1.67	$ (1.18)
Class B Common Stock [Member]
Denominator:
Weighted-average shares outstanding									5,577	5,577	5,577
Basic earnings (loss) per share									$ 1.65	$ 1.51	$ (1.09)
Numerator:
Allocation of net income (loss)									$ 9,206	$ 8,434	$ (6,069)
Denominator:
Number of shares used in basic computation									5,577	5,577	5,577
Weighted-average shares effect of dilutive securities
Diluted earnings (loss) per share									$ 1.65	$ 1.51	$ (1.09)
Basic and diluted (loss) earnings per share	$ 0.44	$ 0.37	$ 0.72	$ 0.12	$ 0.45	$ 0.16	$ 0.15	$ 0.75	$ 1.65	$ 1.51	$ (1.09)

Condensed Financial Informati_3

Condensed Financial Information of Parent Company - Summary of Condensed Balance Sheets (Detail) - USD ($)	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Assets [Abstract]
Short-term investments	$ 20,900,155	$ 14,030,222
Cash	103,094,236	49,318,930	$ 52,594,461	$ 37,833,435
Property and equipment	4,390,377	4,558,072
Other	1,393,053	2,047,058
Total assets	2,160,520,324	1,923,161,131
Liabilities [Abstract]
Cash dividends declared to stockholders	4,436,301	4,075,234
Other	6,470,652	7,524,095
Total liabilities	1,642,746,204	1,472,145,612
Stockholders' equity	517,774,120	451,015,519	398,869,901	448,696,104
Total liabilities and stockholders' equity	2,160,520,324	1,923,161,131
Parent Company [Member]
Assets [Abstract]
Investment in subsidiaries/affiliates (equity method)	540,665,000	489,657,000
Short-term investments	9,000	2,502,000
Cash	15,321,000	2,350,000	$ 1,542,000	$ 3,237,000
Property and equipment	833,000	944,000
Other	1,721,000
Total assets	558,549,000	495,453,000
Liabilities [Abstract]
Cash dividends declared to stockholders	4,436,000	4,075,000
Notes payable to subsidiary	35,000,000	35,000,000
Other	1,339,000	5,362,000
Total liabilities	40,775,000	44,437,000
Stockholders' equity	517,774,000	451,016,000
Total liabilities and stockholders' equity	$ 558,549,000	$ 495,453,000

Condensed Financial Informati_4

Condensed Financial Information of Parent Company - Summary of Condensed Statements of Income (Loss) and Comprehensive Income (Loss) (Detail) - USD ($)	3 Months Ended								12 Months Ended
	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Revenues
Realized investment gains									$ 2,777,919	$ 21,984,617	$ (4,801,509)
Total revenues	$ 197,496,666	$ 196,512,266	$ 198,899,772	$ 184,911,206	$ 200,938,743	$ 198,009,900	$ 198,788,954	$ 214,713,874	777,819,910	812,451,471	771,828,320
Expenses
Interest									1,196,406	1,579,299	2,302,082
Total expenses									714,547,407	755,370,441	820,065,169
Income before income tax expense (benefit) and equity in undistributed net income (loss) of subsidiaries									63,272,503	57,081,030	(48,236,849)
Income tax expense (benefit)									10,457,251	9,929,286	(15,476,509)
Net income (loss)	14,568,355	11,836,998	22,678,778	3,731,121	14,153,747	5,186,379	4,788,454	23,023,164	52,815,252	47,151,744	(32,760,340)
Statements of Comprehensive Income (Loss)
Net income (loss)	$ 14,568,355	$ 11,836,998	$ 22,678,778	$ 3,731,121	$ 14,153,747	$ 5,186,379	$ 4,788,454	$ 23,023,164	52,815,252	47,151,744	(32,760,340)
Other comprehensive income (loss), net of tax
Unrealized gain (loss) - subsidiaries									11,078,406	14,848,545	(7,019,532)
Comprehensive income (loss)									63,441,694	61,883,973	(39,385,469)
Parent Company [Member]
Revenues
Dividends from subsidiaries									14,000,000	4,000,000	11,000,000
Realized investment gains										12,378,000
Other									463,000	1,009,000	3,196,000
Total revenues									14,463,000	17,387,000	14,196,000
Expenses
Operating Expenses									1,258,000	1,420,000	1,628,000
Interest									794,000	1,327,000	2,224,000
Total expenses									2,052,000	2,747,000	3,852,000
Income before income tax expense (benefit) and equity in undistributed net income (loss) of subsidiaries									12,411,000	14,640,000	10,344,000
Income tax expense (benefit)									1,059,000	636,000	411,000
Income before equity in undistributed net income (loss) of subsidiaries									13,470,000	14,004,000	9,933,000
Equity in undistributed net (income) loss of subsidiaries									39,345,000	33,148,000	(42,693,000)
Net income (loss)									52,815,000	47,152,000	(32,760,000)
Statements of Comprehensive Income (Loss)
Net income (loss)									52,815,000	47,152,000	(32,760,000)
Other comprehensive income (loss), net of tax
Unrealized gain (loss) - subsidiaries									10,427,000	14,732,000	(6,625,000)
Other comprehensive income (loss), net of tax									10,627,000	14,732,000	(6,625,000)
Comprehensive income (loss)									$ 63,442,000	$ 61,884,000	$ (39,385,000)

Condensed Financial Informati_5

Condensed Financial Information of Parent Company - Summary of Condensed Statements of Cash Flows (Detail) - USD ($)	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Cash Flows from Operating Activities:
Net income (loss)	$ 52,815,252	$ 47,151,744	$ (32,760,340)
Adjustments:
Realized investment gains	(2,777,919)	(21,984,617)	4,801,509
Other	(399,440)	6,033,243	299,262
Net adjustments	48,319,148	29,208,033	96,536,474
Net cash provided by operating activities	101,134,400	76,359,777	63,776,134
Cash Flows from Investing Activities:
Net sale (purchases) of short-term investments	(6,869,933)	2,718,538	(5,698,845)
Net cash used in investing activities	(99,675,325)	(43,377,179)	(37,606,007)
Cash Flows from Financing Activities:
Cash dividends paid	(16,976,093)	(16,092,643)	(15,658,950)
Issuance of common stock	19,292,324	4,834,514	3,249,849
Payments on lines of credit		(25,000,000)
Borrowings under lines of credit	50,000,000		1,000,000
Net cash provided by (used in) financing activities	52,316,231	(36,258,129)	(11,409,101)
Cash at beginning of year	49,318,930	52,594,461	37,833,435
Cash at end of year	103,094,236	49,318,930	52,594,461
Donegal Financial Services Corporation [Member]
Cash Flows from Investing Activities:
Sale of equity securities		33,923,000
Parent Company [Member]
Cash Flows from Operating Activities:
Net income (loss)	52,815,000	47,152,000	(32,760,000)
Adjustments:
Equity in undistributed net (income) loss of subsidiaries	(39,345,000)	(33,148,000)	42,694,000
Realized investment gains		(12,378,000)
Other	(5,615,000)	490,000	2,531,000
Net adjustments	(44,960,000)	(45,036,000)	45,225,000
Net cash provided by operating activities	7,855,000	2,116,000	12,465,000
Cash Flows from Investing Activities:
Net sale (purchases) of short-term investments	2,493,000	(2,473,000)
Net purchase of property and equipment	(18,000)	(150,000)	(106,000)
Sale of equity securities		20,287,000
Investment in subsidiaries	(1,037,000)	(18,283,000)	(2,644,000)
Other			(1,000)
Net cash used in investing activities	1,438,000	33,304,000	(2,751,000)
Cash Flows from Financing Activities:
Cash dividends paid	(16,976,000)	(16,093,000)	(15,659,000)
Issuance of common stock	20,654,000	6,481,000	3,250,000
Payments on lines of credit		(25,000,000)
Borrowings under lines of credit			1,000,000
Net cash provided by (used in) financing activities	3,678,000	(34,612,000)	(11,409,000)
Net increase (decrease) in cash	12,971,000	808,000	(1,695,000)
Cash at beginning of year	2,350,000	1,542,000	3,237,000
Cash at end of year	$ 15,321,000	$ 2,350,000	$ 1,542,000

Segment Information - Summary o

Segment Information - Summary of Financial Data by Segment (Detail) - USD ($)	3 Months Ended								12 Months Ended
	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Premiums earned:
Premiums earned	$ 185,488,060	$ 184,925,733	$ 184,373,768	$ 187,252,778	$ 189,420,787	$ 189,821,058	$ 188,763,313	$ 188,073,242	$ 742,040,339	$ 756,078,400	$ 741,290,873
Net investment income									29,504,466	29,514,955	26,907,656
Investment gains (losses)									2,777,919	21,984,617	(4,801,509)
Equity in earnings of DFSC										295,000	2,693,962
Total revenues	$ 197,496,666	$ 196,512,266	$ 198,899,772	$ 184,911,206	$ 200,938,743	$ 198,009,900	$ 198,788,954	$ 214,713,874	777,819,910	812,451,471	771,828,320
Underwriting income (loss):
Net investment income									29,504,466	29,514,955	26,907,656
Net investment gains (losses)									2,777,919	21,984,617	(4,801,509)
Equity in earnings of DFSC										295,000	2,693,962
Income (loss) before income tax expense (benefit)									63,272,503	57,081,030	(48,236,849)
Operating Segments [Member]
Premiums earned:
Premiums earned									742,040,000	756,078,000	741,291,000
Net investment income									29,504,000	29,515,000	26,908,000
Investment gains (losses)									2,778,000	21,985,000	(4,802,000)
Equity in earnings of DFSC										295,000	2,694,000
Other									3,497,000	4,578,000	5,737,000
Total revenues									777,819,000	812,451,000	771,828,000
Underwriting income (loss):
SAP underwriting income (loss)									30,906,000	6,787,000	(75,649,000)
GAAP adjustments									(959,000)	(3,079,000)	894,000
GAAP underwriting income (loss)									29,947,000	3,708,000	(74,755,000)
Net investment income									29,504,000	29,515,000	26,908,000
Net investment gains (losses)									2,778,000	21,985,000	(4,802,000)
Equity in earnings of DFSC										295,000	2,694,000
Other									1,043,000	1,578,000	1,718,000
Income (loss) before income tax expense (benefit)									63,272,000	57,081,000	(48,237,000)
Commercial Lines [Member] | Operating Segments [Member]
Premiums earned:
Premiums earned									412,877,000	385,465,000	337,924,000
Underwriting income (loss):
SAP underwriting income (loss)									(858,000)	8,404,000	(22,059,000)
Personal Lines [Member] | Operating Segments [Member]
Premiums earned:
Premiums earned									329,163,000	370,613,000	403,367,000
Underwriting income (loss):
SAP underwriting income (loss)									$ 31,764,000	$ (1,617,000)	$ (53,590,000)

Segment Information - Additiona

Segment Information - Additional Information (Detail)	12 Months Ended
	Dec. 31, 2020Segment
Income Statement [Abstract]
Number of Reportable Segments	3

Guaranty Fund and Other Insur_2

Guaranty Fund and Other Insurance-Related Assessments - Additional Information (Detail) - USD ($)	Dec. 31, 2020	Dec. 31, 2019
Guarantees [Abstract]
Insurance subsidiaries' liabilities for guaranty fund and other insurance	$ 1,600,000	$ 1,600,000
Surcharges collected by insurance subsidiaries	$ 485,322	$ 519,462

Interim Financial Data - Summar

Interim Financial Data - Summary of Interim Financial Data (Detail) - USD ($)	3 Months Ended								12 Months Ended
	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Summary of interim financial data
Net premiums earned	$ 185,488,060	$ 184,925,733	$ 184,373,768	$ 187,252,778	$ 189,420,787	$ 189,821,058	$ 188,763,313	$ 188,073,242	$ 742,040,339	$ 756,078,400	$ 741,290,873
Total revenues	197,496,666	196,512,266	198,899,772	184,911,206	200,938,743	198,009,900	198,788,954	214,713,874	777,819,910	812,451,471	771,828,320
Net losses and loss expenses	116,287,707	120,881,041	105,349,019	117,246,526	121,026,333	130,743,395	131,507,280	123,110,656	459,764,293	506,387,664	576,458,420
Net (loss) income	$ 14,568,355	$ 11,836,998	$ 22,678,778	$ 3,731,121	$ 14,153,747	$ 5,186,379	$ 4,788,454	$ 23,023,164	$ 52,815,252	$ 47,151,744	$ (32,760,340)
Class A Common Stock [Member]
Net (loss) earnings per common share:
Earnings per share, Basic	$ 0.50	$ 0.41	$ 0.80	$ 0.13	$ 0.50	$ 0.19	$ 0.17	$ 0.82	$ 1.84	$ 1.68	$ (1.18)
Earnings per share, Diluted	0.49	0.41	0.79	0.13	0.50	0.18	0.17	0.82	1.83	1.67	(1.18)
Class B Common Stock [Member]
Net (loss) earnings per common share:
Earnings per share, Basic									1.65	1.51	(1.09)
Earnings per share, Diluted									1.65	1.51	(1.09)
Common stock - basic and diluted	$ 0.44	$ 0.37	$ 0.72	$ 0.12	$ 0.45	$ 0.16	$ 0.15	$ 0.75	$ 1.65	$ 1.51	$ (1.09)

Schedule III - Supplementary _2

Schedule III - Supplementary Insurance Information (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
SEC Schedule, 12-16, Insurance Companies, Supplementary Insurance Information [Line Items]
Net Premiums Earned	$ 742,040	$ 756,078	$ 741,291
Net Investment Income	29,504	29,515	26,908
Net Losses and Loss Expenses	459,764	506,388	576,458
Amortization of Deferred Policy Acquisition Costs	119,072	122,443	120,964
Other Underwriting Expenses	125,863	114,562	113,270
Net Premiums Written	742,140	752,601	744,016
Deferred Policy Acquisition Costs	59,157	59,285
Liability For Losses and Loss Expenses	962,007	869,674
Unearned Premiums	537,190	510,147
Commercial Lines [Member]
SEC Schedule, 12-16, Insurance Companies, Supplementary Insurance Information [Line Items]
Net Premiums Earned	412,877	385,465	337,924
Net Losses and Loss Expenses	264,053	242,685	246,048
Amortization of Deferred Policy Acquisition Costs	66,253	62,424	55,143
Other Underwriting Expenses	72,245	61,631	51,635
Net Premiums Written	425,986	404,879	349,895
Deferred Policy Acquisition Costs	33,246	30,947
Liability For Losses and Loss Expenses	694,569	582,682
Unearned Premiums	301,901	266,297
Personal Lines [Member]
SEC Schedule, 12-16, Insurance Companies, Supplementary Insurance Information [Line Items]
Net Premiums Earned	329,163	370,613	403,367
Net Losses and Loss Expenses	195,711	263,703	330,410
Amortization of Deferred Policy Acquisition Costs	52,819	60,019	65,821
Other Underwriting Expenses	53,618	52,931	61,635
Net Premiums Written	316,154	347,722	394,121
Deferred Policy Acquisition Costs	25,911	28,338
Liability For Losses and Loss Expenses	267,438	286,992
Unearned Premiums	235,289	243,850
Investments [Member]
SEC Schedule, 12-16, Insurance Companies, Supplementary Insurance Information [Line Items]
Net Investment Income	$ 29,504	$ 29,515	$ 26,908