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Summary of Significant Accounting Policies (Detail) - USD ($) |  | 1 Months Ended | 12 Months Ended
--- | --- | --- | ---
Mar. 08, 2019 | Jan. 31, 2019 | Jul. 31, 2018 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Business Acquisition [Line Items] |  |  |  |  |  |
Operations commenced date |  |  |  | Aug. 26, 1986 |  |
Stock ownership percentage owned by third party |  |  |  | 51.80% |  |
Voting power percentage of outstanding common stock |  |  |  | 71.00% |  |
Tax benefit for tax deductions related to option exercises |  |  |  | $ 64,765 | $ 25,938 | $ 873,515
Minimum percentage of class A common stock declared dividend excess over class B dividend |  |  |  | 10.00% |  |
Premiums and losses related to certain products |  |  |  | 63.50% | 63.90% | 64.30%
Atlantic States [Member] |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Percentage of share in results of pooled business subsidiary |  |  |  | 80.00% | 80.00% |
Donegal Mutual [Member] |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Percentage of share in results of pooled business owned by third party |  |  |  | 20.00% | 20.00% |
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 |  |  |
Payments for restructuring cost |  |  | $ 1,500,000 | $ 260,000 |  |
Impairment charge of real estate |  |  |  |  | $ 1,100,000 |
Fair value of real asset held for sale |  |  |  |  | $ 1,200,000 |
Net proceeds from sale of branch |  | $ 1,200,000 |  |  |  |
Restructuring charges, accrual |  |  |  | 130,000 |  |
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 |  |  |  | 43.00% |  |
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% |  |

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