Crossover can't process DX11 graphics yet. If you disable the DX11 DLLs the game reverts to DX9 and will run.
Open Crossover, Configure menu, Manage Bottles, pick the Steam bottle containing Banished, Open C: Drive button.
Navigate to
Program Files>Steam>steamapps>common>Banished
And rename the files
VideoDX11-steam-x32.dll
VideoDX11-steam-x64.dll
to
VideoDX11-steam-x32.dll.bak
VideoDX11-steam-x64.dll.bak