To be pedantic, this was managed money, not deposited. You can go to CS and say "Here, I have a million, please buy and sell some shares for me so my children

To be pedantic, this was managed money, not deposited. You can go to CS and say "Here, I have a million, please buy and sell some shares for me so my children will have two million each", or "here, we sell much in the runup to Christmas but our costs are evenly spread over the year, please manage our spare cash so we'll earn something when we can".