We provided this disclosure on statements and added similiar to our account terms and conditions:
Effective immediately, the Bank may make a change in your checking account that will not affect your available balance, interest earnings, FDIC insurance, or bank statement. The Bank will create a Checking sub account and a Savings sub account. The Bank may periodically transfer funds between these two sub accounts. If your Account is interest bearing, your interest calculation will remain the same. Otherwise, the savings sub accounts will be non-interest bearing. The Savings sub account will be governed by the rules governing our other Savings accounts. This change will allow the Bank to reduce the amount of funds held at the Federal Reserve Bank and will provide more funds to the Bank for lending and investing purposes.
It did stir up quite a few customer calls