As TransWorldOne mentioned, the Fairmont chain has about three or four nice lodges Alberta.
I find however that these lodges are overpriced. If the Lake Louise property is charging something obscene like C$600 a night (which they have in the past), then consider this luxurious Relais & Chateaux property:
http://www.posthotel.com/
These lodges look nice too:
www.banffparklodge.com
www.crmr.com
www.rimrockresort.com