Matthew Henry's Commentary is the best detailed commentary you can own. Matthew Henry goes into very strong detail on the Word of God. If you want to really go very deep into the Word of God this is a must have for your Christian Library.
I have an older set of the commentary's and have enjoyed studying them. They belonged to my Grandfather's cousin who was my preacher growing up. I figured they were a basis for many sermons I heard growing up. I bought this set to give to my Daughter, who along with her family, is very active in their church. I know they will be studied in depth.