Well it seems to me they only purchased the good assets.
They did include Liabilities of $36 billion ( includes $34 billion in deposits) and assets of $38 billion ($25 billion of cash). The Bank acquired only certain financially and strategically complementary parts of Signature and excluded:
Excluded was:
TRANSACTION DOES NOT INCLUDE SIGNATURE'S DIGITAL BANKING OR CRYPTO DEPOSITS OR ITS FUND BANKING BUSINESS
The Company is working on an agreement to sub-service the legacy Signature multi-family, commercial real estate ("CRE"), and other loans it did not acquire.