Harlem's renaissance is impossible to miss. Starbucks and Banana Republic line 125th Street. Whole Foods is coming. Marcus Samuelsson's Red Rooster restaurant draws gourmands from everywhere, and busloads of tourists come to hear gospel choirs in the churches. But one important uptown institution has missed the revival: Carver Federal Savings, the nation's largest African-American-founded bank and the bedrock of the neighborhood's business scene for 67 years.