John Hancock Mutual Life Insurance Co. is the 12th insurer to file a recent request with the government for a federal thrift charter.

In a Jan. 15 application made public by the Office of Thrift Supervision on Friday, the Boston-based firm said it wants to convert First Signature Bank and Trust Co., its New Hampshire-chartered trust bank, to a federal thrift. The converted institution would be called John Hancock Bank and Trust.

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