(Watertown, SD) – Big Sioux Financial, the holding company for Reliabank, is excited to announce the sale of Reliabank Insurance Agency to First MainStreet Insurance (FMSI), headquartered in Cedar Rapids, Iowa.FMSI was founded in 2017 to help insurance agencies like Reliabank Insurance access a broader range of resources and insurance markets. Today, FMSI proudly partners…
