Following tables are used to store the supplier and bank information -
1. IBY_EXTERNAL_PAYEES_ALL : supplier information and customer information
2. IBY_EXT_BANK_ACCOUNTS : external bank account information
3. IBY_PMT_INSTR_USES_ALL : Payment instruments assignments
4. AP_SUPPLIERS : Stores Supplier Information
5. AP_SUPPLIERS_SITES_ALL : Stores Supplier site Information
6. Hz_Parties : Party Information

In, IBY_external_payee_all field name - ext_payee_id is same as ext_bank_account_id in table IBY_EXT_BANK_ACCOUNTS,
and
column party_id in table HZ_PARTIES and Payee_party_id in IBY_EXTERNAL_PAYEES_ALL are same.

Please execute the following query to find out the supplier bank Information -
select IE.EXT_Payee_id,IE.Payee_party_id,ID.BRANCH_ID,ID.BANK_ID,ID.BANK_ACCOUNT_NUM,PR.PARTY_NUMBER,PR.PARTY_NAME,PR.PARTY_TYPE FROM IBY_EXTERNAL_PAYEES_ALL IE, IBY_EXT_BANK_ACCOUNTS ID, HZ_PArties PR WHERE IE.EXT_PAYEE_ID = ID.EXT_BANK_ACCOUNT_ID AND IE.PAYEE_PARTY_ID = PR.PARTY_ID;

Thanks & Regards
Ashish