The collapse of Signature Bank was caused by poor management and inadequate risk management practices, according to the FDIC's post-mortem assessment. The bank's board of directors and management pursued "unrestrained growth" using uninsured deposits without implementing liquidity risk management strategies, which ultimately caused illiquidity when the bank could not manage large withdrawal requests. The report also revealed that Signature often denied addressing the FDIC's concerns or implementing the regulator's supervisory recommendations. Two government bodies were reportedly investigating Signature Bank for potential money laundering before its collapse.