Check your Chart of Accounts and default transfer account
To handle internal transfers you need a transfer account in your charts of account. 

Odoo will generate an account automatically based on the country of your chart of account. To configure your chart of accounts and check the default transfer account go into the accounting module settings, select Configuration -> Settings.

Your chart of accounts will be pre-installed depending on the country specified during your registration, it cannot be changed.

The default transfer account will automatically be generated as well depending on your country’s  law. If necessary it can be modified from the same page.

Register an internal transfer from one bank to another.

The first step is to register the internal payment. To do so go into your accounting dashboard, click on the more button of one of your banks and select New -> Internal transfer.

Create a new payment. The payment type will automatically be set to internal transfer. Select the Bank you want to transfer to, specify the Amount and add a Memo if you wish.

Save and confirm the changes to register the payment.

In terms of accounting the money is now booked in the transfer account. We’ll need to import bank statements to book the money in the final accounts.

Import bank statements and reconcile
Note that the bank balance computed by Odoo is different that the last statement of your bank.

That is because we did not import the bank statement confirming the receiving and sending of the money. It’s thus necessary to import your bank statement and reconcile the payment with the correct bank statement line. Once you receive your bank statements click the new statement button of the corresponding bank to import them.

Fill in your Transactions line. Once done, Odoo will display a Computed Balance. that computed balance is the theoretical end balance of your bank account. If it’s corresponding to the bank statement, it means that no errors were made. Fill in the Ending balance and click on the Reconcile button.

In the payment matching screen
You need to choose counterparts for the payment. Select the correct bank statement line corresponding to the payment and click on the reconcile button. Close the statement to finish the transaction

The same steps will need to be repeated once you receive your second bank statement. Note that if you specify the same amount and the same memo in both bank statements and payment transactions then the reconciliation will happen automatically.