No, and that's the point. I understand that banks mark long-term bonds as hold-to-maturity (and only then can list them at par on their balance sheet). But they
actually have to hold them. Otherwise, they have to mark them to market, and
any sales of HTM bonds flip the entire tranche over to MTM.
So part of the problem is that SVB had a reasonable-looking balance sheet of HTM bonds, then had to sell some at market, which flipped their entire portfolio to MTM and destroyed their balance sheet.
E.g., a simple balance sheet:
Assets Qty. Par Market Total
-----
Mark To Market Bonds 10k $1k $0.8k $8Mn
Hold To Maturity Bonds 1M $1k $0.8k $1Bn
Total $1.08Bn
But then let's say I have $16M of withdrawals. I sell all of my short-term bonds for $8M, but have to cover another $8M, so I sell another 10k bonds at market price.
But, oh shit, now all my long-term bonds have to be marked to market, so now my balance sheet looks like this:
Assets Qty. Par Market Total
-----
Mark To Market Bonds 990k $1k $0.8k $792Mn
Total $792Mn
$16M of outflows have reduced the assets on my balance sheet by
two hundred and sixteen million.