First Internet Bank of Indiana CD Rates for 18 Month Jumbo certificate of deposits are now at 2.15 percent with an APY of 2.17 percent. 18 Month Jumbo CD Rates at First Internet Bank of Indiana were changed from 2.25 percent with a yield of 2.27 percent. Compare First Internet Bank of Indiana CD Rates for 18 Month Jumbo certificates of deposit with other CD rates.