The presidents of all 12 Federal Home Loan Banks are in talks with the Federal Housing Finance Agency over a newly issued moratorium on nonbank mortgage firms – mostly mortgage real estate investment trusts – gaining access to the system’s borrowing window through a captive insurance affiliate. The 90-day moratorium was voluntarily put in place by the FHLB presidents on June 12, said a spokesman for the Council of Federal Home Loan Banks, a trade group of sorts for the 12 regional government-sponsored enterprises.