Unfortunately, in the datasheet you would seek this information in vain.
In dataseet is in table 5. is information only for 1MHz and 17MHz comunications speed , maybe Figure 9. and 12. but this is only typical value and value must be estimated from chart. Analog idle consumption did not publish in datasheet.
In the SPIsolator family of parts, the idle state of the inputs does not change the power consumption. They are an edge-encoded differential architecture. Idling at low or high, its the same either way. That means idle consumption will not be much lower than consumption at 1MHz
My guess +3,3V/+3,3V and 25C
Idd1 2,9-3,0mA
Idd2 4,9-5,0mA