Name That Trauma:: Rob M. on a Faked Home Invasion

Reaching out again because my mind isn't what it used to be.  I'm trying to recall a movie that was released in the last 20 years.  I don't know what year.  I don't know any actors in the movie, but I feel like I would know the name if I saw it. 

It's set in the late 50's or 60's.  It was a major release… had a lot of word of mouth buzz (maybe because the director or producer had a murder style blockbuster similar).  It was set in the midwest or the south.  I think midwest…. maybe Kansas.  So let's say Kansas in the late '50s or '60s.  The movie begins with a home invasion.  The family is living in a mid-century modern style home.  The family consists of Husband, Wife and maybe one or two kids. During that home invasion the wife is killed and the criminals flee.  This is a ruse.  This was set up by the husband and his wife's sister (whom he is really in love with). They would get away with it, if not for a nosy insurance claims adjuster who is very suspicious.  There is an attempt to poison his coffee.  It's all very much like Fargo.  These people aren't killers.  They make horrible choices and pile more horrible choices on top of them.

There is one more element to the film.  Racial tension perhaps?  I say this because at one point an angry mob surrounds their house for days on end.  I'm not sure I remember why.
Thanks again, Rob M.