Frontier Bank
Sioux Falls, South Dakota, Minnehaha County
$349M in total assets, the 2,294th largest of 4,309 US banks and 28th of 58 headquartered in South Dakota.
- FDIC certificate
- 33922
- Established
- 1994
- Owned by
- Rock Rivers Bcorp
- Primary regulator
- OCC
- Website
- www.frontierbank.com
At a glance
Compared with 24 banks headquartered in South Dakota with $100 million to $1 billion in assets, as of June 30, 2026.
| Measure | This bank | Percentile | Peer range, middle 90% | Peer median |
|---|---|---|---|---|
| Total assets | $349M | 67% | $253M | |
| Loans | $241M | 67% | $165M | |
| Deposits | $324M | 75% | $218M | |
| Return on assets | 0.54% | 8% | 1.66% | |
| Net interest margin | 3.07% | 8% | 3.79% | |
| Efficiency ratio | 78.8% | 96% | 53.9% | |
| Equity to assets | 6.73% | 8% | 10.43% | |
| Loans to deposits | 75% | 39% | 86% |
Growth
Total assets grew 5.9% a year over the last 5 years and 5.9% a year over 10 years, without acquisitions.
Acquisitions
| Closed | Acquired bank | Assets at acquisition |
|---|---|---|
| Jan 1999 | First Bank and Trust Company Rock Rapids, IA, an affiliate under the same holding company | $63M |
| Jun 1994 | United Federal Savings Association of Iowa Des Moines, IA | $196M |
Where they operate
5 branches in 2 counties.
Largest markets by deposits
| County | Deposits | Market share | Rank |
|---|---|---|---|
| Lyon County, IA | $255M | 33.6% | 1 of 6 |
| Minnehaha County, SD | $69M | 0.0% | 17 of 26 |
Deposits by branch from the FDIC Summary of Deposits, June 2026. Rank among all banks with branches in that county.
Branch history since 2016
No change since 2016. The bank has operated 5 branches throughout, with none opened, acquired, closed or sold.
Balance sheet and earnings
Loans by type
| Type | Share | This bank | Peers |
|---|---|---|---|
| Commercial real estate | 32% | 13% | |
| 1-4 family residential | 21% | 13% | |
| Agricultural | 16% | 31% | |
| Farmland | 12% | 22% | |
| Multifamily | 7% | 3% | |
| Business (C&I) | 6% | 10% | |
| Construction and land | 3% | 3% | |
| Consumer | 1% | 4% | |
| Other | 3% | 1% |
Deposits by type
| Type | Share | This bank | Peers |
|---|---|---|---|
| Time deposits | 50% | 37% | |
| Other interest-bearing | 40% | 45% | |
| Noninterest-bearing | 10% | 19% |
Brokered deposits are 20.0% of deposits (peers 2.4%).
Return on assets
Trailing four quarters, with the peer median.
Credit and capital
| This bank | Peer median | |
|---|---|---|
| Noncurrent loans | 0.00% | 0.21% |
| Net charge-offs, annualized | 0.01% | 0.00% |
| Reserves to loans | 1.15% | 1.28% |
| Leverage ratio | 8.76% | 10.77% |
Noncurrent loans exclude government-guaranteed portions.
Related banks
Similar size in South Dakota
Largest competitors in Lyon County, IA
Figures as of June 30, 2026 from the bank's Call Report, FDIC structure and branch data, and the Federal Reserve. Short link: bankingstats.com/banks/frontier-bank-sioux-falls-sd