To become a successful business analyst in banking, you need a range of skills and knowledge

1. Banking Knowledge: A sound understanding of banking products, banking operations, regulations, and economic trends is essential for a business analyst in banking. This will help you analyze and identify trends, investigate issues, and provide valuable insights to stakeholders.

2. Business Analysis Tools and Techniques: Business analysts should be proficient in using various business analysis tools and techniques such as data analysis, process modeling, use case diagrams, requirements gathering, and stakeholder management. They should also have a good understanding of agile methodologies.

3. Communication and Interpersonal Skills: The ability to communicate effectively is critical to the success of a business analyst in banking. You'll interact with stakeholders at all levels of the organization, and it's important to be able to articulate complex concepts in a way that stakeholders can understand. Active listening, negotiation, and conflict resolution skills are also essential.

4. Problem-solving and Critical Thinking: A business analyst in banking is tasked with identifying and solving complex problems. You should be able to analyze data, identify patterns, and make informed decisions based on that data.

5. Time Management: Business analysts in banking often work on multiple projects simultaneously, and it's essential to be able to prioritize tasks, meet deadlines, and manage your time efficiently.

In summary, to become a successful business analyst in banking, you need a combination of banking knowledge, business analysis tools and techniques, communication and interpersonal skills, problem-solving and critical thinking skills, and time management skills. Continuous learning and keeping up with industry trends is also crucial to maintaining your relevance and staying ahead in your profession.