But lawmakers squabbled Tuesday over the causes of the meltdowns at SVB and Signature Bank. Silicon Valley Bank had $211 billion in assets at the end of last year. Barr blamed mismanagement at the bank, since Fed supervisors repeatedly warned SVB that it had major issues. “SVB’s failure is a textbook case of mismanagement.”The failure of SVB — which was sold Sunday to First Citizens bank — and Signature Bank have ignited fresh political scrutiny of the Fed and other bank regulators, with lawmakers expected to investigate. Both parties are pushing for tougher oversight of the central bank itself.