The Co-op (referred to in [0]) is also a bank, funeral directors, insurer, and solicitor! They're really quite successful to be honest.

Nationwide is another example of a successful cooperative as well (large UK bank, particularly in the mortgage space). They're customer and employee owned I believe, my wife and I got £200 last year as a profit share for being customers.

I'm a huge fan of the model, but it's difficult to get going. I think they're also more expensive to run as their operations tend to be a little more complex.