As preparations intensify for a Palestinian-Israeli summit meeting in Washington on Thursday, the crude outlines of a Palestinian state are emerging in the West Bank, with increasingly reliable security forces, a more disciplined government and a growing sense among ordinary citizens that they can count on basic services.

Personal checks, long shunned as being unredeemable, are now widely accepted. Traffic tickets are issued and paid, movie theaters are opening and public parks are packed with families late into the summer nights. Economic growth in the first quarter of this year was 11 percent over the same period in 2009, the International Monetary Fund says.

“I’ve never seen Nablus so alive,” Caesar Darwazeh, who owns a photography studio, said on Sunday night as throngs of people enjoyed balloons and popcorn, a four-wagon train taking merrymakers through the streets.