Some will, some won't, but every bank should accept a filed small estate affidavit. This comprehensive guide aims to help you unravel the complexities of using a Small Estate Affidavit in Illinois.Learn how to set up an estate account so that you can manage the deceased person's finances according to their wishes. They might not allow you to leave it open. Updating the database of the Illinois Compiled Statutes (ILCS) is an ongoing process. Updating the database of the Illinois Compiled Statutes (ILCS) is an ongoing process. My mother passed away with nothing (no real estate, car, savings). Don't open an outofstate account. Take copies of the letters of office or small estate affidavit and death certificate with you. All collected cash assets will be placed in the estate's account.