Lower rate alert on 18 month jumbo CD rates at Luana Savings Bank. The new lower 18 month jumbo CD interest rate is 0.65 percent with a yield of 0.65 percent. The old 18 month jumbo CD rate was 0.75 percent with a yield of 0.75 percent. See how many times the rate was changed on this 18 month jumbo certificate of deposit at Luana Savings Bank 18 Month Jumbo CD Rates.