“IT TOOK us two years, but the greed kept us going,” Yusuf Munshi told police after they arrested him and his accomplice. Mr Munshi had tunnelled under a branch of Sonali Bank, Bangladesh’s biggest state-owned bank, in the town of Kishoreganj, and made off with five sacks of cash containing 164m taka ($2m). On social media, people advised the robbers that there is a less time-consuming way to get your hands on a pile of cash: befriend the bank manager. Bangladesh’s government banks are normally fleeced at street level during opening hours, in plain sight. In 2012, in the biggest of many banking scandals since the banks were nationalised 40 years before, Sonali Bank revealed that one of its branches in Dhaka had granted a particular firm almost 27 billion taka in loans on false premis...