Bank Branches › Illinois › Warren County › 122 W Boston Ave
Full-service office · FDIC office no. 278225
Fortress Bank
122 W Boston Ave, Monmouth, IL 61462
Open · June 2026
$41.9M
deposits, 2026
1882
established
4th
of 6 in county
4
names on the sign
| Date | Bank on the sign | Deposits | Change |
|---|---|---|---|
| Jun 30 2026 | Fortress Bank | $41.9M | +14% |
| Jun 30 2025 | Fortress Bank | $36.6M | −20% |
| Jun 30 2024 | Fortress Bank | $45.8M | +63% |
| Jun 30 2023 | Fortress Bank | $28.2M | +33% |
| Jun 30 2022 | Fortress Bank | $21.2M | −34% |
| Jun 30 2021 | Fortress Bank | $32.0M | +54% |
| Jun 30 2020 | Fortress Bank | $20.7M | +42% |
| Jun 30 2019 | Fortress Bank | $14.6M | +19% |
| Jun 30 2018 | Fortress BankNEW NAME | $12.3M | −1% |
| Jun 30 2017 | First State Bank of Illinois | $12.4M | +10% |
| Jun 30 2016 | First State Bank of Illinois | $11.2M | −11% |
| Jun 30 2015 | First State Bank of Illinois | $12.7M | +51% |
| Jun 30 2014 | First State Bank of Illinois | $8.4M | −11% |
| Jun 30 2013 | First State Bank of Illinois | $9.4M | +8% |
| Jun 30 2012 | First State Bank of Illinois | $8.7M | +8% |
| Jun 30 2011 | First State Bank of Illinois | $8.0M | 0% |
| Jun 30 2010 | First State Bank of Illinois | $8.0M | +14% |
| Jun 30 2009 | First State Bank of IllinoisNEW NAME | $7.0M | 0% |
| Jun 30 2008 | First State Bank of Western Illinois | $7.0M | −41% |
| Jun 30 2007 | First State Bank of Western Illinois | $11.9M | +12% |
| Jun 30 2006 | First State Bank of Western Illinois | $10.6M | +29% |
| Jun 30 2005 | First State Bank of Western Illinois | $8.2M | +17% |
| Jun 30 2004 | First State Bank of Western IllinoisNEW NAME | $7.0M | +5% |
| Jun 30 2003 | Associated Bank Illinois, National Association | $6.7M | −15% |
| Jun 30 2002 | Associated Bank Illinois, National Association | $7.9M | −26% |
| Jun 30 2001 | Associated Bank Illinois, National Association | $10.7M | +2% |
| Jun 30 2000 | Associated Bank Illinois, National Association | $10.5M | −8% |
| Jun 30 1999 | Associated Bank Illinois, National Association | $11.3M | |
| 1882-01-01 | Office established (FDIC record) — 117 years before this passbook begins | ||
Nearest other open offices in Warren County
- <0.1 miCommunity National Bank in Monmouth · 311 N Main St, Monmouth
- 0.2 miMidwest Bank · 200 E Broadway, Monmouth
- 0.2 miSecurity Savings Bank · 220 E Broadway, Monmouth
- 0.7 miCBI Bank & Trust · 2 Americinn Way, Ste D, Monmouth
- 12.6 miMorton Community Bank · 100 S Main St, Roseville
All banks in Warren County →
Every Fortress Bank office →
Earlier names and banks folded into Fortress Bank →
Names on the sign
1999–2003Associated Bank Illinois, National Association2004–2008First State Bank of Western Illinois2009–2017First State Bank of Illinois2018–nowFortress 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) 278225.