Custer County, South Dakota, a county in the Rapid City-Spearfish, SD market, holds $148M in deposits across 2 insured institutions and 3 branches. First Interstate Bank is the largest deposit holder at 76.0% share. The top three banks hold 100% of deposits, which places the county in the Concentrated band. Deposits have grown 11.3% since 2021 while the branch count rose by 50.0%. It produced $306M of real gross domestic product in 2024, ranking #1,444 of the 1,523 ranked counties by economic output.
Ranks show where the county stands among the 1,523 ranked counties (those within a Combined or Metropolitan Statistical Area that have a branch). They describe relative position, not a rating of market quality or suitability.
Deposit trend
Branches: 2 in 2021 to 3 in 2026. Institutions: 2 to 2. Top-three share: 100% to 100%.
Institutions by deposits
| Institution | Deposits | Share | 5‑yr deposits |
|---|---|---|---|
| First Interstate Bank | $112M | 76.0% | +13% |
| Dacotah Bank | $35M | 24.0% | +7% |
The 2 insured institutions with a branch presence in this county, per the FDIC Summary of Deposits, June 30, 2026. Five-year change compares the same institution’s county deposits in 2021 and 2026. Institutions are tracked by FDIC certificate number, and where an institution acquired another bank, the acquired bank’s prior deposits are folded into the baseline so the change reflects the combined, continuing franchise rather than reading as new. “No 2021 presence” means neither the institution nor a bank it later absorbed reported deposits in this county that year. Deposit figures are nominal and are not adjusted for inflation.
Part of the Rapid City-Spearfish market
Custer County is one of 4 counties that make up the Rapid City-Spearfish, SD market, a Combined Statistical Area (ranked #207 of 293 U.S. markets by economic output). It produces 3.4% of the market’s output and holds 3.0% of its deposits.
| Measure | Custer County | Share of parent market |
|---|---|---|
| 2024 GDP | $306M | 3.4% |
| Deposits | $148M | 3.0% |
| Population | 9,431 | 5.1% |
View the full Rapid City-Spearfish market profile →
Recruiting in Custer County
Deposits are held closely by the largest banks, which often means the bankers worth recruiting are inside a small number of institutions. Who holds the deposits, and how contested the market is, shapes both the runway for growth and the competition you would be recruiting against. We recruit commercial relationship managers, banking teams, and market leaders for banks building in markets like Custer County.
See how we help banks recruit commercial banking talent