The Workers Credit Union is a mortgage from Workers Credit Union. The ongoing APR is The index used for TRS ARM products is the weekly average yield on United States Treasury securities adjusted to a constant maturity of one year. The current margin is 2.75%.. Typical credit limit: Jumbo Rate Loan limits: 1 family $2,000,000 at 80% LTV. Lesser loan limits apply on LTVs greater than 80%..