Organization	6 Months Ended
Jun. 30, 2013
Accounting Policies [Abstract]
Organization	1—Organization 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”), Le Mars Insurance Company (“Le Mars”), the Peninsula Insurance Group (“Peninsula”), which consists of Peninsula Indemnity Company and The Peninsula Insurance Company, Sheboygan Falls Insurance Company (“Sheboygan”) and Michigan Insurance Company (“MICO”), write personal and commercial lines of property and casualty coverages exclusively through a network of independent insurance agents in certain Mid-Atlantic, Midwestern, New England and Southern states. We also own 48.2% of the outstanding stock of Donegal Financial Services Corporation (“DFSC”), a grandfathered unitary savings and loan holding company that owns Union Community Bank (“UCB”). UCB completed its conversion from a federal savings bank to a state savings bank in the second quarter of 2013. UCB has 13 banking offices, all of which are located in Lancaster County, Pennsylvania. Donegal Mutual owns the remaining 51.8% of the outstanding stock of DFSC. We have four segments: our investment function, our personal lines of insurance, our commercial lines of insurance and our investment in DFSC. The personal lines products of our insurance subsidiaries consist primarily of homeowners and private passenger automobile policies. The commercial lines products of our insurance subsidiaries consist primarily of commercial automobile, commercial multi-peril and workers’ compensation policies. At June 30, 2013, Donegal Mutual held approximately 38% of our outstanding Class A common stock and approximately 76% of our outstanding Class B common stock. This ownership provides Donegal Mutual with approximately 66% of the total voting power of the two outstanding classes of our common stock. Our insurance subsidiaries and Donegal Mutual have interrelated operations that arise from 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 pooling agreement with Donegal Mutual. Under the pooling agreement, Atlantic States has an 80% share of the results of the pooled business, and Donegal Mutual has a 20% share of the results of the pooled business. 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 our 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 Donegal Mutual and our insurance subsidiaries offer 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 either company. Therefore, the underwriting profitability of the business the individual companies write directly will vary. However, because the underwriting pool homogenizes the risk characteristics of all business Donegal Mutual and Atlantic States write directly, Donegal Mutual and Atlantic States share the underwriting results in proportion to their respective participation in the pool. Pooled business represents the predominant percentage of the net underwriting activity of both Donegal Mutual and Atlantic States. On February 23, 2009, our board of directors authorized a share repurchase program pursuant to which we may purchase up to 300,000 shares of our Class A common stock at prices prevailing from time to time in the open market subject to the provisions of applicable rules of the Securities and Exchange Commission (the “SEC”) and in privately negotiated transactions. We did not purchase any shares of our Class A common stock under this program during the six-month period ended June 30, 2013. We purchased 45,764 shares of our Class A common stock under this program during the six-month period ended June 30, 2012. We have purchased a total of 271,692 shares of our Class A common stock under this program from its inception through June 30, 2013. 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 applicable rules of the SEC and in privately negotiated transactions. At our annual meeting of stockholders on April 18, 2013, our stockholders approved an amendment to our certificate of incorporation that increased the number of shares of our Class A common stock we have the authority to issue from 30.0 million shares to 40.0 million shares.

1—Organization

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”), Le Mars Insurance Company (“Le Mars”), the Peninsula Insurance Group (“Peninsula”), which consists of Peninsula Indemnity Company and The Peninsula Insurance Company, Sheboygan Falls Insurance Company (“Sheboygan”) and Michigan Insurance Company (“MICO”), write personal and commercial lines of property and casualty coverages exclusively through a network of independent insurance agents in certain Mid-Atlantic, Midwestern, New England and Southern states. We also own 48.2% of the outstanding stock of Donegal Financial Services Corporation (“DFSC”), a grandfathered unitary savings and loan holding company that owns Union Community Bank (“UCB”). UCB completed its conversion from a federal savings bank to a state savings bank in the second quarter of 2013. UCB has 13 banking offices, all of which are located in Lancaster County, Pennsylvania. Donegal Mutual owns the remaining 51.8% of the outstanding stock of DFSC.

We have four segments: our investment function, our personal lines of insurance, our commercial lines of insurance and our investment in DFSC. The personal lines products of our insurance subsidiaries consist primarily of homeowners and private passenger automobile policies. The commercial lines products of our insurance subsidiaries consist primarily of commercial automobile, commercial multi-peril and workers’ compensation policies.

At June 30, 2013, Donegal Mutual held approximately 38% of our outstanding Class A common stock and approximately 76% of our outstanding Class B common stock. This ownership provides Donegal Mutual with approximately 66% of the total voting power of the two outstanding classes of our common stock. Our insurance subsidiaries and Donegal Mutual have interrelated operations that arise from 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 pooling agreement with Donegal Mutual. Under the pooling agreement, Atlantic States has an 80% share of the results of the pooled business, and Donegal Mutual has a 20% share of the results of the pooled business.

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 our 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 Donegal Mutual and our insurance subsidiaries offer 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 either company. Therefore, the underwriting profitability of the business the individual companies write directly will vary. However, because the underwriting pool homogenizes the risk characteristics of all business Donegal Mutual and Atlantic States write directly, Donegal Mutual and Atlantic States share the underwriting results in proportion to their respective participation in the pool. Pooled business represents the predominant percentage of the net underwriting activity of both Donegal Mutual and Atlantic States.

On February 23, 2009, our board of directors authorized a share repurchase program pursuant to which we may purchase up to 300,000 shares of our Class A common stock at prices prevailing from time to time in the open market subject to the provisions of applicable rules of the Securities and Exchange Commission (the “SEC”) and in privately negotiated transactions. We did not purchase any shares of our Class A common stock under this program during the six-month period ended June 30, 2013. We purchased 45,764 shares of our Class A common stock under this program during the six-month period ended June 30, 2012. We have purchased a total of 271,692 shares of our Class A common stock under this program from its inception through June 30, 2013.

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 applicable rules of the SEC and in privately negotiated transactions.

At our annual meeting of stockholders on April 18, 2013, our stockholders approved an amendment to our certificate of incorporation that increased the number of shares of our Class A common stock we have the authority to issue from 30.0 million shares to 40.0 million shares.