hard-to-believe low interest rates in Utah??

[Mercedes Smith]

Hi, I just happened across Associated Mortgages in the Salt Lake City area of Utah. They have interest rates for 30 year conventional mortgages at 3.75% right now, March 9, 2019. This seems exceptionally low. Has anyone heard of them? According to their website they've been in business since 1989 and seemed legit when I met them in person today. I believe they only have 2 or 3 employees, so a very small outfit with no overhead -I assume that's how they are keeping their costs low? Has anyone heard of them? What advice do you have for working with such a small mortgage company? Thanks!