Banks are having a rough month. First Silvergate Bank collapsed, with the company announcing its liquidation on March 8. Then Silicon Valley Bank collapsed two days later on March 10. And then two days after that, on March 12, Signature Bank was shut down by regulators.  By the numbers, Signature Bank’s collapse is the third-largest failure in U.S. banking history. Silicon Valley Bank is the second-largest failure, right behind Washington Mutual’s collapse in 2008. So banks…