Just to complement @Kanak answer.
The major roles of finance industries are providing financing facilities, instead of involving in the creation of various speculative derivatives and masquerade them as "investment" product and call it "diversify from the financing business". When shit hits the fans, e.g. a shift of paradigm due to policy changes, technology change, mentality change, such none-core "diversify profile" will crash.
Take Germany financial industries as an example, there is a huge number of Genossenschaftbank that provide credit to the local industry, rather than involving in various "diversification", they survive most of the crisis, few need to call out for "more money supply". All funds managers view the credit unions like Genossenschaftbank as "conservative", because they have little investor pressure to make huge returns. As long as a financial institution not fooling around with "huge returns", you will not see high underwriting risk(nonperforming loans) coming from such institutions.