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Condensed Financial Information of Parent Company - Summary of Condensed Statements of Cash Flows (Detail) - USD ($) | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Cash Flows from Operating Activities: |  |  |
Net income (loss) | $ 47,151,744 | $ (32,760,340) | $ 7,116,100
Adjustments: |  |  |
Realized investment gains | (21,984,617) | 4,801,509 | (5,705,255)
Other | 6,033,243 | 299,262 | (113,482)
Net adjustments | 29,208,033 | 96,536,474 | 73,884,098
Net cash provided by operating activities | 76,359,777 | 63,776,134 | 81,000,198
Cash Flows from Investing Activities: |  |  |
Net (purchases) sale of short-term investments | 2,718,538 | (5,698,845) | (1,678,908)
Sale of equity securities | 20,287,000 |  |
Net cash used in investing activities | (43,377,179) | (37,606,007) | (58,443,382)
Cash Flows from Financing Activities: |  |  |
Cash dividends paid | (16,092,643) | (15,658,950) | (14,822,052)
Issuance of common stock | 4,834,514 | 3,249,849 | 15,511,457
Payments on lines of credit | (25,000,000) |  | (10,000,000)
Borrowings under lines of credit |  | 1,000,000 |
Net cash used in financing activities | (36,258,129) | (11,409,101) | (9,310,595)
Cash at beginning of year | 52,594,461 | 37,833,435 | 24,587,214
Cash at end of year | 49,318,930 | 52,594,461 | 37,833,435
Donegal Financial Services Corporation [Member] |  |  |
Adjustments: |  |  |
Dividends received from DFSC |  |  | 1,037,000
Cash Flows from Investing Activities: |  |  |
Sale of equity securities | 33,923,000 |  |
Parent Company [Member] |  |  |
Cash Flows from Operating Activities: |  |  |
Net income (loss) | 47,152,000 | (32,760,000) | 7,116,000
Adjustments: |  |  |
Equity in undistributed net (income) loss of subsidiaries | (33,148,000) | 42,694,000 | 5,343,000
Realized investment gains | (12,378,000) |  |
Other | 490,000 | 2,531,000 | 1,011,000
Net adjustments | (45,036,000) | 45,225,000 | 7,391,000
Net cash provided by operating activities | 2,116,000 | 12,465,000 | 14,507,000
Cash Flows from Investing Activities: |  |  |
Net (purchases) sale of short-term investments | (2,473,000) |  | 1,000
Net purchase of property and equipment | (150,000) | (106,000) | (788,000)
Investment in subsidiaries | (18,283,000) | (2,644,000) | (2,992,000)
Other | 0 | (1,000) | (1,000)
Net cash used in investing activities | 33,304,000 | (2,751,000) | (3,780,000)
Cash Flows from Financing Activities: |  |  |
Cash dividends paid | (16,093,000) | (15,659,000) | (14,821,000)
Issuance of common stock | 6,481,000 | 3,250,000 | 15,511,000
Payments on lines of credit |  |  | (10,000,000)
Borrowings under lines of credit |  | 1,000,000 |
Net cash used in financing activities | (34,612,000) | (11,409,000) | (9,310,000)
Net increase (decrease) in cash | 808,000 | (1,695,000) | 1,417,000
Cash at beginning of year | 1,542,000 | 3,237,000 | 1,820,000
Cash at end of year | $ 2,350,000 | $ 1,542,000 | $ 3,237,000

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