Five friends of mine (families) moved up there ten years ago or so (Rathdrum, Post Falls, etc.) Three families have come back to San Diego, one couple divorced and she's back in San Diego and he's working the South Dakota oil fields and the fifth one (the original) passed away this year (wife is still there.)
Not as easy as it sounds -- work was tough to find and didn't pay that well (and they locals don't like Californians quite so much). The one in the S. Dakota was selling real estate until the economy collapsed. Then he was driving a school bus.
Beautiful area and cold winters -- I also have family in the Sandpoint area, but they've been there a long time.
(PS -- I'd probably have joined the exodus ten years ago but my wife doesn't like to be cold and I'm kinda fond of her!