I don't know, but what I know is the Banks' basic function is to collect deposit, and to lend out their cash, with minimum reserves for different countries' policies.
Banks have no interest in keeping Properties.
In a case of default of mortgage repayments, banks would usually Auction it off through local courts.
If they could sell it at fair market value, great, or higher... if not, LL, just sell, and recuperate the remainder.
Banks are obsessed with liquidity of funds, and loaning out as much money as possible.
Unless you are talking about some Banks that have Investment Arms, then that's a totally different idea all together.