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Warren County, IL Bank Deposit Market Share

Midwest Bank holds the largest share of deposits in Warren County, IL, 50.9%, followed by Security Savings Bank (30.3%) and Community National Bank in Monmouth (7.5%). 6 institutions hold $638.9M at 6 offices as of June 30, 2026, up 4.8% from 2025.

Institutions: 6 Offices: 6 Deposits: $638.9M Survey: FDIC Summary of Deposits, June 30, 2026

Largest share changes since 2025

Gained: Midwest Bank (1.32 points); Fortress Bank (0.56 points); CBI Bank & Trust (0.48 points).

Lost: Security Savings Bank (-1.79 points); Community National Bank in Monmouth (-0.36 points); Morton Community Bank (-0.21 points).

# Institution Offices Deposits Market share Share change from 2025 Deposit change
1 Midwest Bank 1 $325.3M 50.91% +1.32 pts 7.6%
2 Security Savings Bank 1 $193.6M 30.30% -1.79 pts -1.1%
3 Community National Bank in Monmouth 1 $47.7M 7.46% -0.36 pts 0.0%
4 Fortress Bank 1 $41.9M 6.57% +0.56 pts 14.5%
5 Morton Community Bank 1 $21.2M 3.33% -0.21 pts -1.3%
6 CBI Bank & Trust 1 $9.2M 1.44% +0.48 pts 57.7%

About this list

Deposits are those held at each institution's offices in Warren County as of June 30, 2026, from the FDIC Summary of Deposits, whatever state the institution is headquartered in. Market share is the institution's deposits divided by all deposits in the market. Shares are by bank charter, not rolled up to the holding company, and cover FDIC-insured institutions only, so credit unions are not included. Each office is placed in its county and metro area by the FDIC branch directory; the few offices the directory does not list are left out of the market and of every share.

Share change compares the institution's share in 2025 and 2026 in percentage points. Deposit change compares its deposits here in the two years and includes deposits that moved through mergers and branch sales; "New" means it had no offices here a year earlier. Offices that closed during the year are placed by their ZIP code or city.

Wider markets

Deposit market share in Illinois Illinois bank directory

Other counties in Illinois

Cook CountyDupage CountyLake CountyWill CountyKane CountyMchenry CountySangamon CountyWinnebago CountyChampaign CountyMadison CountySt. Clair CountyMclean CountyPeoria CountyLasalle CountyTazewell CountyDekalb CountyRock Island CountyKankakee CountyKendall CountyEffingham CountyColes CountyMacon CountyAdams CountyKnox CountyWhiteside CountyWilliamson CountyHenry CountyGrundy CountyClinton CountyVermilion CountyStephenson CountyLivingston CountyOgle CountyBureau CountyMacoupin CountyMonroe CountyJackson CountyMontgomery CountyIroquois CountyRandolph County

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