Unusual to get quite so much steam, although these cars do steam a bit due to the size of the exhaust systems.
Before I get too worried I think i'd reset the ECU (remove the EF1 & EFI2 fuses for 5 mins, or disconnect the battery for the same amount of time) then take the car for at least a 20 min drive of different types of driving. Then see how it is after the drive.
This would allow the ECU to re-learn settings and also clear any moisture\steam. If there are still problems idling after that i'd look to clean the ISCV.
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