Another new round of banking regulations likely will give investors yet another reason to stay away from the battered industry.

Federal Reserve Governor Daniel Tarullo this week announced that future stress tests will be geared toward demanding even higher cash buffers for big banks. The new rules, which won't take effect until 2017, will establish a "stress capital buffer" for stress tests that analysts say could raise capital requirements for large institutions by 3 or 4 percentage points.