I find it funny that people take money out of First Republic and deposit into the big banks. The big banks then proceeds to return the money to First Republic. They call it a bank run but ultimately there's really no place to run.
SVB is (was?) 16 and First Republic is 14th "largest commercial banks" based on this report (not sure what it is measuring? assets at the Fed?) as per this December 2022 (probably outdated) report: https://www.federalreserve.gov/releases/lbr/current/
Cash deposits in banks are supposed to be “low risk, low reward”, but at First Republic they’ve suddenly become “more risk, low reward”. Individuals will decide for themselves if this causes their portfolio to be unbalanced (and apparently for many of them the answer is “yes my funds in First Republic are too risky, I must rebalance.”)
Large banks have different portfolios and may have funds available to assign to these (now riskier) investments.