You do not have to tell your bank anything about applying the 2018 contribution towards the 2019 contribution. The contributions and earnings are staying in the Roth IRA account. It is all done on your 2019 tax return that you apply the excess contribution to your 2019 contribution during the interview.
You will only pay the 6% penalty on the 2018 tax return for the excess contribution.
You cannot recharacterize your 2018 contribution. A contribution must be recharacterized on or before your tax-filing deadline for the year for which it was made (for 2018 this was October 15, 2019).
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