What are the effects of a bank robbery on the bank?

I've found several articles talking about the effect of bank robbery on the bank robber (it's generally not a good career path to choose) but none focused on the bank.

I'm sure it's not good to have your bank robbed, but I also know that banks have insurance to guard against robberies. I'm imagining a small- to medium-sized bank, large enough to have multiple branches covering a region (maybe a half dozen states). Not one of the behemoths like BoA or Citigroup.