Bethany Lutheran College in Minnesota is small (around 600 students), Lutheran (obviously), and serious about the liberal arts. Situated in Mankato, it's not glamorous, but the academics are legitimately solid. You're getting a traditional education with an explicitly Christian context, which some students crave and others actively avoid.
The vibe is earnest and friendly rather than cutthroat. Class sizes are tiny, which means your professor will definitely notice if you're coasting. Strong programs in nursing and education. The social life is low-key and faith-centered, with a healthy portion of Minnesota nice built into the culture.