Mortgage bank securities became known as toxic assets, no one wanted to be anywhere near them.
抵押贷款银行的证券被称为有毒资产，没人愿意接近。
英语百科
Mortgage bank
A mortgage bank is a bank that specializes in originating and/or servicing mortgage loans.
In the US a mortgage bank is a state-licensed banking entity that makes mortgage loans directly to consumers. The difference between a mortgage banker and a mortgage broker is that the mortgage banker funds loans with its own capital.