Dutch cooperative bank Rabobank [RABO.UL] plans to lay off nearly a fifth of its workforce to boost profit and prepare for tougher European banking guidelines, it said on Wednesday. The bank said it would shed 9,000 of its 47,000 staff by 2018 and would cut 150 billion euros ($164.7 billion) worth of assets from its balance sheet by 2020, to comply with a rulebook known as Basel IV intended to help make banks more resilient to economic and market shocks. The moves are part of a strategic plan in the works since Chief Executive Wiebe Draijer was appointed in October 2014.