Is Durham's own Square 1 Bank the highest performing bank in the state? It is according to Banker's Caddy. Banker's Caddy, a St. Louis-based research firm that tracks and ranks banks on several ratios, including earnings, asset quality, capitalization, growth and liquidity, released its 2014 bank rankings this week, putting entrepreneur-focused Square 1 Bank, which is about to be acquired by Los Angeles-based PacWest , at the top of the list.