California Heritage Bank was seized by regulators.

The action by the state superintendent of banks followed a three-week examination by regulators who discovered that the San Diego-based bank, with a dwindling asset base of $18 million, was insolvent. A team of 50 liquidators took over the bank’s two branches at 6 p.m. Friday. If regulators cannot find a buyer for the bank in the next few days, officials will liquidate its assets.