Organization	6 Months Ended
Jun. 30, 2018
Organization, Consolidation and Presentation of Financial Statements [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 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”), a state savings bank. 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, 2018, Donegal Mutual held approximately 43% of our outstanding Class A common stock and approximately 84% of our outstanding Class B common stock. This ownership provides Donegal Mutual with approximately 72% 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, Donegal Mutual and our insurance subsidiaries 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, the two companies pool their insurance business and each company receives an allocated percentage of the pooled business. 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 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 entire personal lines or commercial lines accounts. Distinctions within the products Donegal Mutual and our insurance subsidiaries offer relate generally to specific risk profiles targeted within similar classes of business, such as preferred tier products versus standard tier products, but we do not allocate all of the standard risk gradients to any specific company within the Donegal Insurance Group. Therefore, the underwriting profitability of the business the individual companies write directly will vary. However, because the risk characteristics of all business Donegal Mutual and Atlantic States write directly are homogenized within the underwriting pool, Donegal Mutual and Atlantic States share the underwriting results in proportion to their respective participation in the underwriting pool. Donegal Mutual completed the merger of Mountain States Mutual Casualty Company (“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, 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 those of its insurance subsidiaries as the Mountain States Insurance Group in four Southwestern states. For an indefinite period of time, Donegal Mutual will exclude the business of the Mountain States Insurance Group from the pooling agreement with Atlantic States. As a result, our consolidated financial results exclude the results of Donegal Mutual’s operations in those Southwestern states. On April 3, 2018, we announced plans to consolidate the branch office operations of Peninsula into our home office operations effective July 2, 2018 to achieve economies of scale and enhance service levels for policyholders of Peninsula. We recorded a restructuring charge for employee termination costs associated with the Peninsula consolidation of approximately $1.9 million. On June 11, 2018, we and Donegal Mutual entered into an agreement to sell DFSC and UCB to Northwest Bancshares, Inc. (“Northwest”) for approximately $85.0 million in a combination of cash and Northwest common stock. Immediately prior to the closing of the merger, DFSC will pay a dividend of approximately $30.0 million to us and Donegal Mutual. As the owner of 48.2% of DFSC’s common stock, we will receive a dividend payment from DFSC of approximately $14.5 million and consideration from Northwest that will range in value from $38.9 million to $43.0 million. Subject to receipt of various regulatory approvals and satisfaction of other customary closing conditions, we anticipate that the merger will close during the first quarter of 2019. 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 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 (“SEC”) and in privately negotiated transactions. We did not purchase any shares of our Class A common stock under this program during the six months ended June 30, 2018 or 2017. We have purchased a total of 57,658 shares of our Class A common stock under this program from its inception through June 30, 2018.

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 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”), a state savings bank. 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, 2018, Donegal Mutual held approximately 43% of our outstanding Class A common stock and approximately 84% of our outstanding Class B common stock. This ownership provides Donegal Mutual with approximately 72% 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, Donegal Mutual and our insurance subsidiaries 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, the two companies pool their insurance business and each company receives an allocated percentage of the pooled business. 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 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 entire personal lines or commercial lines accounts. Distinctions within the products Donegal Mutual and our insurance subsidiaries offer relate generally to specific risk profiles targeted within similar classes of business, such as preferred tier products versus standard tier products, but we do not allocate all of the standard risk gradients to any specific company within the Donegal Insurance Group. Therefore, the underwriting profitability of the business the individual companies write directly will vary. However, because the risk characteristics of all business Donegal Mutual and Atlantic States write directly are homogenized within the underwriting pool, Donegal Mutual and Atlantic States share the underwriting results in proportion to their respective participation in the underwriting pool.

Donegal Mutual completed the merger of Mountain States Mutual Casualty Company (“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, 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 those of its insurance subsidiaries as the Mountain States Insurance Group in four Southwestern states. For an indefinite period of time, Donegal Mutual will exclude the business of the Mountain States Insurance Group from the pooling agreement with Atlantic States. As a result, our consolidated financial results exclude the results of Donegal Mutual’s operations in those Southwestern states.

On April 3, 2018, we announced plans to consolidate the branch office operations of Peninsula into our home office operations effective July 2, 2018 to achieve economies of scale and enhance service levels for policyholders of Peninsula. We recorded a restructuring charge for employee termination costs associated with the Peninsula consolidation of approximately $1.9 million.

On June 11, 2018, we and Donegal Mutual entered into an agreement to sell DFSC and UCB to Northwest Bancshares, Inc. (“Northwest”) for approximately $85.0 million in a combination of cash and Northwest common stock. Immediately prior to the closing of the merger, DFSC will pay a dividend of approximately $30.0 million to us and Donegal Mutual. As the owner of 48.2% of DFSC’s common stock, we will receive a dividend payment from DFSC of approximately $14.5 million and consideration from Northwest that will range in value from $38.9 million to $43.0 million. Subject to receipt of various regulatory approvals and satisfaction of other customary closing conditions, we anticipate that the merger will close during the first quarter of 2019.

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 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 (“SEC”) and in privately negotiated transactions. We did not purchase any shares of our Class A common stock under this program during the six months ended June 30, 2018 or 2017. We have purchased a total of 57,658 shares of our Class A common stock under this program from its inception through June 30, 2018.