Regulators seized control of First Republic Bank and sold it to JPMorgan Chase on Monday, a dramatic move aimed at curbing a two-month banking crisis that has rattled the financial system.

First Republic, whose assets were battered by the rise in interest rates, had struggled to stay alive after two other lenders collapsed last month, spooking depositors.

First Republic was taken over by the Federal Deposit Insurance Corporation and immediately sold to JPMorgan. The deal was announced hours before U.S. markets are set to open, and after a scramble by officials over the weekend. Later on Monday, 84 First Republic branches in eight states will reopen as JPMorgan branches.

JPMorgan will “assume all of the deposits and substantially all of the assets of First Republic Bank,” the F.D.I.C. said in a statement. The regulator estimated that its insurance fund would have to pay out about $13 billion to cover First Republic’s losses. JPMorgan also said that the F.D.I.C. would provide it with $50 billion in financing.

“Our government invited us to step up, and we did,” said Jamie Dimon, JPMorgan’s chief executive. He said the transaction was intended “to minimise costs to the Deposit Insurance Fund.”