Good references(books or lecture notes) for self study on Banach Algebra.

Can someone suggest some good references(books or lecture notes) for self study on Banach Algebra?

By background being a first course in Functional Analysis and a course in Measure Theory.

Most preferably other than some of known to be:

• Rudin, Functional Analysis.

• Conway, Functional Analysis.

Thank You.

I would suggest the book by Richard V. Kadison/John R. Ringrose, Fundamentals of the Theory of Operator Algebras Volume I, and you may pair this one with another book by Corneliu Constantinescu, $C^{\ast}$-algebras Volume II.