– Leaving Arvest Bank. You are about to visit a third-party site not operated by Arvest Bank, a FDIC-insured institution. Arvest Bank’s privacy policy and security practices do not apply to the site you are about to enter, please review the third-party’s privacy and security practices.Compare 30 Year Mortgage Rates Mortgage Interest Rate Chart Daily Current 30 Year Fha mortgage remaining time period. After the set time period your interest rate will change and so will your monthly payment. Examples: 10/1 ARM: Your interest rate is set for 10 years then adjusts for 20 years.