County banking markets / SD / 46103
PenningtonSouth Dakota
FIPS 46103. Branch offices reported to the FDIC Summary of Deposits, June 30 of each survey year, 1994–2025. One of 64 counties in South Dakota’s 2025 survey.
Concentration, 1994–2025
Branch-count HHI squares each institution’s share of the county’s branch offices; deposit HHI squares its share of county deposits. The bands are the 2010 Horizontal Merger Guidelines classification, the dashed line the 1,800 level above which the Federal Reserve reviews a merger centrally. In 2025 this market is moderately concentrated on branches (1,569) and unconcentrated on deposits (1,392).
Source: FDIC Summary of Deposits | DOJ & FTC, Horizontal Merger Guidelines (2010), section 5.3 | Federal Reserve, Competitive Effects of Mergers and Acquisitions FAQs Both indices computed from the SOD branch rows for this county, June 30 of each survey year. Neither is the Fed's screen HHI: no thrift weighting, no exclusion of specialty and internet banks, no central-booking adjustment. Methodology
Branches and institutions
21 branch offices and 9 institutions in 1994; 23 and 10 in 2025. Deposits booked in the county went from $791.2M to $3.24B, nominal.
Source: FDIC Summary of Deposits FDIC Summary of Deposits, June 30 of each survey year, 1994-2025. Methodology
Who holds the deposits, 2025
Every institution with a branch in the county, ranked by deposits booked here. Both shares are shown because they are the two indices above: squaring and summing the deposit column gives the deposit HHI, the branch column the branch-count HHI.
| # | Institution | Deposits | Deposit share | Branches | Branch share |
|---|---|---|---|---|---|
| 1 | First Interstate Bank cert 1105 | $622.2M | 19.22% | 7 | 30.43% |
| 2 | U.S. Bank National Association cert 6548 | $553.7M | 17.10% | 3 | 13.04% |
| 3 | Wells Fargo Bank, National Association cert 3511 | $541.3M | 16.72% | 3 | 13.04% |
| 4 | Security First Bank cert 5415 | $400.4M | 12.37% | 2 | 8.70% |
| 5 | Black Hills Community Bank, N.A. cert 58723 | $383.9M | 11.86% | 1 | 4.35% |
| 6 | Pioneer Bank & Trust cert 15562 | $345.8M | 10.68% | 2 | 8.70% |
| 7 | Dacotah Bank cert 17437 | $155.3M | 4.80% | 1 | 4.35% |
| 8 | First National Bank cert 14712 | $99.4M | 3.07% | 1 | 4.35% |
| 9 | BankWest, Inc. cert 4009 | $97.9M | 3.02% | 2 | 8.70% |
| 10 | First Western Federal Savings Bank cert 31972 | $37.8M | 1.17% | 1 | 4.35% |
Source: FDIC Summary of Deposits June 30, 2025. Branch rows grouped by FDIC certificate; names as reported to the survey. Deposit share is n/a where the county's total SOD deposits are zero. Methodology
Back to county banking markets, up to South Dakota, or read the methodology for the two HHI constructions and what they cannot tell you.