Keeping employees engaged and happy at work is a challenge even in the most mundane of times. But doing so amid persistent economic uncertainty, political flareups, technological disruption and fast growth driven by industry consolidation is truly something to brag about.Over the past year, banks have grappled with both familiar and new challenges: higher deposit costs, reduced demand for loans, a rapidly changing regulatory environment, employee-retention issues, the swift ramp-up of artificial intelligenc ...