It began in a back office serving workers at the potato houses of the Snake River Plain. Today the institution — still legally a member-owned cooperative — manages a balance sheet measured in the billions, with branches from Twin Falls to Post Falls and a mobile app that rivals any national bank's.

The growth has been a genuine success story, extending low-cost lending to communities that the big banks long overlooked. But scale brings its own dilemmas. A cooperative that once knew its borrowers by name now underwrites loans by algorithm, and some longtime members wonder whether the institution still belongs to them in any meaningful sense.

Management insists the mission is intact, pointing to dividend rates and small-business lending that outpace the commercial banks. Critics counter that a multibillion-dollar lender competing statewide looks a great deal like the institutions it was founded to challenge.

The tension is not unique to Idaho, but it is playing out here at unusual speed — a function of the same growth reshaping everything else in the valley.