Frontier Bank
Sioux Falls, SD · Owner: Rock Rivers Bcorp
$349M
total assets, June 30, 2026
$349M
total assets, June 30, 2026
Frontier Bank is a savings bank based in Sioux Falls, SD, owned by Rock Rivers Bcorp. As of June 30, 2026 it held $349.2 million in assets and $323.8 million in deposits; assets were up 0.7% from a year before. It has 5 branches in 2 states.
Updated Oct 11, 2026 · numbers as of June 30, 2026
Total assets
$349M
+0.7% in a year · +1.3% in a quarter
Deposits
$324M
+3.6% in a year · +2.8% in a quarter
Loans
$241M
+1.6% in a year · -0.1% in a quarter
Profit so far
$816K
Jan 1 to Jun 30, 2026 · +14.8% in a year
Capital ratio
8.76%
+0.04 pts in a year
Return on assets
0.47%
+0.05 pts in a year
Facts
- Type
- Savings bank
- Head office
- 101 S Phillips Ave, Sioux Falls, SD, 57104
- County
- Minnehaha
- Holding company
- Rock Rivers Bcorp
- Established
- Jun 24, 1994
- Employees
- 47
- Branches
- 5 in 2 states
- Website
- www.frontierbank.com
- Id
- b33922
Quarter by quarter
June 30, 1994 to June 30, 2026
Assets, deposits and loans
Each quarter end, US dollars
Profit by quarter
Net income of each quarter, the last 12
Ratios
Percent. Return on assets and net interest margin are yearly rates.
Branches
5 offices as of June 30, 2026, holding $323.8 million in deposits
Branch map
Every branch, sized by its deposits
| State | Branches | Deposits | Share |
|---|---|---|---|
| Iowa | 3 | $255M | 78.8% |
| South Dakota | 2 | $68.6M | 21.2% |
| Largest branches | Place | Deposits |
|---|---|---|
| Rock Rapids Branch | Rock Rapids, IA | $214M |
| Sioux Falls Branch | Sioux Falls, SD | $46.7M |
| Little Rock Branch | Little Rock, IA | $22.0M |
| Frontier Bank (main office) | Sioux Falls, SD | $22.0M |
| George Branch | George, IA | $19.0M |
Related pages
Questions and answers
How big is Frontier Bank?
$349.2 million in total assets and $323.8 million in deposits as of June 30, 2026, with assets up 0.7% from a year before. Its loans were $241.5 million.
How many branches does Frontier Bank have?
5 branches in 2 states as of June 30, 2026. The most deposits are in Iowa ($255.2 million).
Is Frontier Bank profitable?
Yes: it earned $816,000 from January 1 to June 30, 2026 (up 14.8% from the same months a year before). Its return on assets was 0.47% a year; about 1% is typical.
Who owns Frontier Bank?
Frontier Bank is owned by Rock Rivers Bcorp, its holding company.
Official public data from the reports every insured bank files each quarter. Profit so far runs from January 1 to the quarter end. Branch deposits are counted once a year, as of June 30. New quarters appear about two months after the quarter ends.