What kind of characters are the lawyer and the banker in "The Bet"?Static or dynamic?

The definition of a dynamic
character, is one who changes though the course of the story, as
opposed to a static character, who does not change.  Both
the banker and the lawyer are dynamic
characters.

The lawyer, young and boisterous at the
beginning of the story, is greatly affected and changed by his fifteen year
imprisonment.  Though he endures much of it and seems to be changing positively (playing
the piano, learning new languages, enrapturing himself in vigorous study), we see that
at the end of his sentence he is emaciated and has aged greatly and for the worst. 
Though he easily won the bet (by remaining imprisoned for the entire 15 years) he leaves
a day before his sentence is over, thereby forfeiting his winning.  This shows the
greatest change in character.  He submits to being proven wrong and basically admits
that he would have rather died than be shut up for 15 years in
solitude.

The banker changes as a result of his
circumstances.  In the 15 years he keeps the lawyer prisoner, he loses all of his money
and knows the reward he owes will destroy him.  While he was a rich and seemingly honest
man at the beginning of the story, his lack of wealth at the end drive him to dishonesty
and even a plan for murder.

The changes of each character
from the beginning of the story to the end could be considered extreme, which makes
these men dynamic characters.