(Bloomberg) -- Berkshire Hathaway Inc. agreed to buy Medical Liability Mutual Insurance Co., extending Chairman Warren Buffett’s leadership in the business of protecting doctors against lawsuits.

The target company is the largest underwriter of medical professional liability insurance in New York and will convert from a policyholder-owned to a stock business, Omaha, Nebraska-based Berkshire’s National Indemnity unit said Monday in a statement that didn’t disclose terms. Policyholder surplus, a measure of assets minus liabilities, was $1.8 billion as of Dec. 31, according to the statement. The deal is expected to be completed in the third quarter of 2017, pending regulatory and customer approvals.

“MLMIC is a gem of a company that has protected New York’s physicians, mid-level providers, hospitals and dentists like no other for over 40 years,” Buffett said in the statement. “Good things are worth waiting for.”

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