Custer County, South Dakota, a county in the Rapid City-Spearfish, SD market, holds $151M in deposits across 2 insured institutions and 3 branches. First Interstate Bank is the largest deposit holder at 76.4% share. The top three institutions hold 100.0% of deposits, which places the county in the concentrated band. Deposits have grown 38.1% since 2020 while the branch count rose by 1. It produces $306M of output, ranking #1,444 of the 1,523 counties within a CSA or MSA by economic output.
Deposit trend
Branches: 2 in 2020 to 3 in 2025. Institutions: 2 to 2. Top-three share: 100.0% to 100.0%.
Leading institutions by deposits
| Institution | Deposits | Share | 5‑yr |
|---|---|---|---|
| First Interstate Bank | $115M | 76.4% | +33% |
| Dacotah Bank | $36M | 23.6% | +55% |
The 2 insured institutions with a branch presence in this county, as of June 30, 2025. Five-year change compares the same institution’s county deposits in 2020 and 2025. 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. Even so, a large gain can reflect acquisition rather than competitive growth; “no 2020 presence” means neither the institution nor a bank it later absorbed reported deposits in this county that year.
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 3.2% of its deposits.
| Measure | Custer County | Share of Rapid City-Spearfish market |
|---|---|---|
| 2024 GDP | $306M | 3.4% |
| Deposits | $151M | 3.2% |
| 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, on a retained basis.
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