Using Bank Find, you can determine if your bank is insured by the FDIC, where you can go if you have a complaint, and find out the history of your bank. You can then use FDIC's online calculator – EDIE the Estimator –  to determine if your accounts are insured.
For additional information call toll-free 1-877-ASK-FDIC (1-877-275-3342); Hearing impaired 1-800-925-4618.