Ideal Federal Savings Bank has until March 31 to find a buyer, a deadline set by the Office of Thrift Supervision after the federal agency determined the small Baltimore institution was undercapitalized.

The bank — which opened in 1920 to combat rampant discrimination in lending — is one of the oldest continuously operated black-owned businesses in the country, according to Creative Investment Research, an analyst of minority and women-owned banks.

But Ideal had just $6.3 million in assets at the end of last year, and borrowers were behind by 90 days or more on about 11 percent of its loans.