SQL & PL/SQL

currently using db 21c XE, required below for Oracle Apex app.
i have following data and want it to:

1. if user enter like 'Cash' it should select bank_name like '%Cash%' (Cash Transaction) from here
2. if not like 'Cash' then it should select bank_name where auto_dep_flag = 'Y'
   i tried Case in With clause but still failed, please help.

with bank_details as (Select 1 bank_id, 'First Bank' bank_name, 'N' auto_dep_flag from dual union all
           Select 2 bank_id, 'Deposit Bank' bank_name, 'Y' auto_dep_flag from dual union all
           Select 3 bank_id, 'Cash Transaction' bank_name, 'N' auto_dep_flag from dual
)
select bank_name from bank_details 

regards