Not sure why so many of you are surprised or think this is odd behavior of a bank. There is a reason why any good real-estate agent will tell you to be careful with large bank transactions close to closing. Withdraws aren't as bad as deposits though. With large deposits the bank is having to make sure you aren't getting loans/borrowing money in order to qualify.
Flame away if you want but with what we just went through (and are still fighting to get out of) in the housing market I'm glad banks are being more careful. And, yes I know. Some of you with big bank rolls don't have as much to worry about with these things but for the average person this is a good reminder for people to see.
P.S. - No, I don't work for a bank so no prejudice there