Why isn't the Bible in chronological order?

I started wondering why the books of the Bible are not in chronological order (ordered according to the date of the events in each book took place) when I realized that the events of Esther took place before Ezra and Nehemiah. Why didn't the compilers of the canon put the book of Esther first? I found this answer on a website called Got Questions.org.

The books of the Bible are primarily divided by the type of literature. For example, Genesis through Esther are primarily historical, Job through Song of Solomon are poetry, Isaiah through Malachi are prophecy. Similarly, Matthew through Acts are historical, Romans through Jude are letters to churches or individuals, Revelation is prophecy. Within the type of literature, the books of the Bible are in basic chronological order. For example, Isaiah's prophecies occurred before Jeremiah's prophesies.

It can be confusing. That is why chronological Bibles can come in so handy. A chronological Bible actually puts the content of the Bible in chronological order. As an example, Isaiah ministered during the times of the kings. So, a chronological Bible puts Isaiah’s prophecies in the appropriate place in the books of 1 and 2 Kings. A chronological Bible also takes the four Gospels and attempts to put all of the events in order.

(from http://www.gotquestions.org/chronological-Bible.html)