Here’s the link to problem banks, on Calculated risk.

http://www.calculatedriskblog.com/2011/08/unofficial-problem-bank-list-at-988.html

As noted, all is not puppy dog and roses at all credit unions, problems with some.
Seems mostly limited to some corporate credit unions, e.g. ACME inc. Credit Union

http://www.calculatedriskblog.com/2010/09/national-credit-union-administration.html