We all know Elliott Carlin had problems. We saw it on 'The Bob Newhart Show'; we saw it in an episode of 'St. Elsewhere'; we even saw this in an episode of 'Alf'.
But how bad were his problems? Could he have been so depressed that he would try to rob a bank?
If so, he at least had enough sanity to not do it in Chicago, where people would recognize him. From this scene in 'Too Close For Comfort', it looks like he flew all the way out to San Francisco in order to pull off a bank job. (Not that he was successful at it; he finally left the bank with nothing.)
It also looks like he changed his toupee for the occasion......