>I immediately think about a run-on-the-bank. If I had my money there, and I read a statement like that, I'd be discreetly moving it elsewhere.
Congratulations! Whether intentional or not, you're trying to start a bank run! Please don't!
The reality of the matter is literally any bank could not survive a bank run. Even JPMorgan. The entire business model of a bank is to take deposits, hope people ask for them in a predictable way, and then lend them out to people (often as mortgages or Treasuries, but also as a lot of different things).
It's a weird system, but it's what we got.
What is happening here is that the resale value of treasuries fall as interest rates rise. This is due to the weird quirk of treasuries having a set payment schedule, which forces the face value to change in order to reach parity with market interest rates. The amount that the government owes BoA at maturity is still the exact same number.
Nothing about those Treasuries has actually changed other than the fact that they earn less interest than a newly issued treasury and if BoA needed to sell them quickly, they would be worth less than what they were paid for.
As you'd guess, this only becomes a problem when people run the bank and the bank needs to sell those Treasuries to meet deposit requirements.
In reality, if BoA gets in trouble, since it is a GSIB, the US government would just spot the bank the original value of those Treasuries (since again, nothing about them has actually changed and the government still owes BoA the original price eventually), everyone would complain, and then we'd move on.
Things will be a lot nicer if we don't have to do that, so please stop!