Condensed Financial Information of Parent Company, Condensed Statements of Cash Flows (Details) - USD ($)	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Cash Flows from Operating Activities: [Abstract]
Net income	$ 25,254,174	$ 52,815,252	$ 47,151,744
Adjustments: [Abstract]
Realized investment gains	(6,477,286)	(2,777,919)	(21,984,617)
Other	867,438	(399,440)	6,033,243
Net adjustments	51,477,794	48,319,148	29,208,033
Net cash provided by operating activities	76,731,968	101,134,400	76,359,777
Cash Flows from Investing Activities: [Abstract]
Net sale (purchases) of short-term investments	8,207,814	(6,869,933)	2,718,538
Net cash used in investing activities	(62,199,311)	(99,675,325)	(43,377,179)
Cash Flows from Financing Activities: [Abstract]
Cash dividends paid	(19,099,220)	(16,976,093)	(16,092,643)
Issuance of common stock	14,181,702	19,292,324	4,834,514
Payments on lines of credit	(50,000,000)	0	(25,000,000)
Net cash (used in) provided by financing activities	(59,917,518)	52,316,231	(36,258,129)
Cash at beginning of year	103,094,236
Cash at end of year	57,709,375	103,094,236
Parent Company [Member]
Cash Flows from Operating Activities: [Abstract]
Net income	25,254,000	52,815,000	47,152,000
Adjustments: [Abstract]
Equity in undistributed net income of subsidiaries	(21,069,000)	(39,345,000)	(33,148,000)
Realized investment gains	0	0	(12,378,000)
Other	(536,000)	(5,615,000)	490,000
Net adjustments	(21,605,000)	(44,960,000)	(45,036,000)
Net cash provided by operating activities	3,649,000	7,855,000	2,116,000
Cash Flows from Investing Activities: [Abstract]
Net sale (purchases) of short-term investments	0	2,493,000	(2,473,000)
Net purchase of property and equipment	(13,000)	(18,000)	(150,000)
Sale of equity securities	0	0	20,287,000
Investment in subsidiaries	(916,000)	(1,037,000)	(18,283,000)
Net cash used in investing activities	(929,000)	1,438,000	33,304,000
Cash Flows from Financing Activities: [Abstract]
Cash dividends paid	(19,099,000)	(16,976,000)	(16,093,000)
Issuance of common stock	15,433,000	20,654,000	6,481,000
Payments on lines of credit	0	0	(25,000,000)
Net cash (used in) provided by financing activities	(3,666,000)	3,678,000	(34,612,000)
Net increase (decrease) in cash	(946,000)	12,971,000	808,000
Cash at beginning of year	15,321,000	2,350,000	1,542,000
Cash at end of year	14,375,000	15,321,000	2,350,000
Parent Company [Member] | Donegal Financial Services Corporation [Member]
Cash Flows from Investing Activities: [Abstract]
Sale of equity securities	$ 0	$ 0	$ 33,923,000