No priviligies to create table in custom database
It looks like you are trying to create a table in a schema called online_banking. In some platforms a schema and a database are synonymous, but in SQL Server, a schema is a container inside a database.


  Instance > Database > Schema > Object 


In order to create a table in the online_banking database, you need to use a three-part name or be in the context of that database. And you should always use the schema prefix.

USE online_banking;
GO
CREATE TABLE dbo.test1(i INT);
GO


Or:

CREATE TABLE online_banking.dbo.test1(i INT);