Banks in the Sunshine State hit a benchmark on March 31 that they haven’t seen since early 2009. The ratio of nonperforming assets to total assets fell below 5 percent in every region of Florida during the first quarter of 2013, according to a report from Monroe Financial Partners Inc. It’s a key sign of strong improvement in the asset quality of Florida’s banks, wrote Paula Johansen, managing director. She called it a “pivotal point.” Nonperforming assets are loans that are 90 days…