They didn't get "lumped in".. They are separate, and being sold separate. Institutional players are currently buying sbny equity, and see returns based on assets above liabilities.
The FDIC has a joint venture with the signature assets.
So, currently here is the joint, and what's still held by Signature Bridge Bank:
$?.??? Billion in cash.
80% in the $17B CRE portfolio.
(20% to Blackstone)
95% in the $5.8B Multifamily portfolio.
(5% to Community preservation Corp.)
80% in the $9B Multifamily portfolio.
(20% to Santander)