Bank Branches › South Dakota › Walworth County › 505 N Main St
Full-service office · FDIC office no. 273309
First Interstate Bank
505 N Main St, Mobridge, SD 57601
Open · June 2026
$60.6M
deposits, 2026
1934
established
3rd
of 5 in county
2
names on the sign
| Date | Bank on the sign | Deposits | Change |
|---|---|---|---|
| Jun 30 2026 | First Interstate Bank | $60.6M | 0% |
| Jun 30 2025 | First Interstate Bank | $60.3M | +13% |
| Jun 30 2024 | First Interstate Bank | $53.3M | 0% |
| Jun 30 2023 | First Interstate Bank | $53.1M | +2% |
| Jun 30 2022 | First Interstate BankNEW NAME | $52.2M | +3% |
| Jun 30 2021 | Great Western Bank | $50.5M | +20% |
| Jun 30 2020 | Great Western Bank | $41.9M | −2% |
| Jun 30 2019 | Great Western Bank | $42.8M | +22% |
| Jun 30 2018 | Great Western Bank | $35.1M | +11% |
| Jun 30 2017 | Great Western Bank | $31.6M | +3% |
| Jun 30 2016 | Great Western Bank | $30.5M | −4% |
| Jun 30 2015 | Great Western Bank | $31.9M | +13% |
| Jun 30 2014 | Great Western Bank | $28.3M | +1% |
| Jun 30 2013 | Great Western Bank | $28.0M | −1% |
| Jun 30 2012 | Great Western Bank | $28.2M | +49% |
| Jun 30 2011 | Great Western Bank | $19.0M | +13% |
| Jun 30 2010 | Great Western Bank | $16.8M | +3% |
| Jun 30 2009 | Great Western Bank | $16.3M | +15% |
| Jun 30 2008 | Great Western Bank | $14.2M | +3% |
| Jun 30 2007 | Great Western Bank | $13.8M | |
| 1934-10-01 | Office established (FDIC record) — 73 years before this passbook begins | ||
Nearest other open offices in Walworth County
- <0.1 miWells Fargo Bank, National Association · 405 N Main St, Mobridge
- 0.1 miDacotah Bank · 320 N Main St, Mobridge
- 1.2 miDakota Community Bank & Trust, National Association · 1711 W Grand Xing, Mobridge
- 19.6 miBankWest, Inc. · 4400 Main St, Selby
All banks in Walworth County →
Every First Interstate Bank office →
Earlier names and banks folded into First Interstate Bank →
Names on the sign
2007–2021Great Western Bank2022–nowFirst Interstate Bank
The FDIC office number stays with the building when banks merge or rename, so the same office appears under each owner. Follow an earlier name to see what became of that bank.
Deposits are the balances the bank assigned to this office on June 30 of each year, in nominal dollars. Source: FDIC Summary of Deposits, office (UNINUMBR) 273309.