Probable reason for the drop today was the recent seizure of a New Mexico bank by the FDIC last Friday. I'd be willing to bet this was one of the main reasons for the selloff today as nervous holders likely jumped ship from the recent runup. From what I have been able to gather, this bank was much smaller in size that FSNM and with fewer assets.
Charter Bank Santa Fe NM 32498 January 22, 2010 January 25, 2010
My post is only my opinion, I recommend you always do your own DD! I am not a licensed broker or a professional by any means, so take what I say as entertainment value at best.