Bank of America, the nation’s largest bank, said Friday that it was extending its suspension of foreclosures to all 50 states.

The plan swept states with some of the highest foreclosure levels, including California, Nevada and Arizona, into a swelling crisis over lenders’ flawed paperwork that had been mostly confined to 23 other states that require judicial review of foreclosures.

Bank of America instituted a partial freeze last week in those 23 states, and three other major mortgage lenders have done the same. The bank’s decision on Friday increased pressure on other lenders to extend their moratoriums nationwide as well.

An immediate effect of the action will be a temporary stay of execution for hundreds of thousands of borrowers in default. The bank said it would be brief, a mere pause while it made sure its methods were in order.