Lists · Deposits by county

St. Clair County, IL Bank Deposit Market Share

Regions Bank holds the largest share of deposits in St. Clair County, IL, 14.2%, followed by Associated Bank, N.A. (8.4%) and Busey Bank (8.0%). 26 institutions hold $5.95B at 68 offices as of June 30, 2026, up 2.1% from 2025.

Institutions: 26 Offices: 68 Deposits: $5.95B Survey: FDIC Summary of Deposits, June 30, 2026

Largest share changes since 2025

Gained: Busey Bank (0.49 points); Bank of Springfield (0.38 points); JPMorgan Chase Bank, N.A. (0.34 points).

Lost: First Bank (-0.42 points); Regions Bank (-0.39 points); Bank of America, N.A. (-0.30 points).

#	Institution	Offices	Deposits	Market share	Share change from 2025	Deposit change
1	Regions Bank	12	$842.8M	14.17%	-0.39 pts	-0.7%
2	Associated Bank, N.A.	3	$498.0M	8.37%	+0.32 pts	6.2%
3	Busey Bank	3	$475.2M	7.99%	+0.49 pts	8.8%
4	Carrollton Bank	1	$459.1M	7.72%	+0.04 pts	2.6%
5	Citizens Community Bank	4	$446.1M	7.50%	+0.33 pts	6.8%
6	Bank of America, N.A.	2	$412.9M	6.94%	-0.30 pts	-2.2%
7	FCB Banks	4	$383.6M	6.45%	+0.14 pts	4.3%
8	Bank of Belleville	1	$345.7M	5.81%	-0.24 pts	-1.9%
9	Bank of O'Fallon	2	$324.1M	5.45%	-0.04 pts	1.4%
10	First National Bank of Waterloo	8	$283.5M	4.77%	+0.02 pts	2.5%
11	Commerce Bank	2	$243.8M	4.10%	-0.14 pts	-1.2%
12	U.S. Bank N.A.	4	$207.2M	3.48%	-0.05 pts	0.7%
13	First Bank	3	$168.0M	2.83%	-0.42 pts	-11.1%
14	First Federal Savings Bank of Mascoutah, Illinois	2	$159.3M	2.68%	+0.05 pts	4.0%
15	Bank of Springfield	2	$134.2M	2.26%	+0.38 pts	22.5%
16	The Central Trust Bank	2	$117.2M	1.97%	-0.03 pts	0.7%
17	PNC Bank, N.A.	1	$61.5M	1.03%	-0.06 pts	-3.3%
18	First Mid Bank & Trust, N.A.	1	$59.2M	1.00%	-0.09 pts	-6.1%
19	Heartland Bank and Trust Company	1	$55.2M	0.93%	-0.13 pts	-10.2%
20	JPMorgan Chase Bank, N.A.	2	$55.0M	0.93%	+0.34 pts	61.6%
21	UMB Bank, N.A.	1	$55.0M	0.93%	-0.03 pts	-0.8%
22	Midland States Bank	1	$52.6M	0.89%	+0.05 pts	8.0%
23	BMO Bank N.A.	1	$49.6M	0.83%	-0.15 pts	-13.3%
24	The Farmers and Merchants National Bank of Nashville	3	$27.4M	0.46%	+0.02 pts	5.7%
25	Lindell Bank & Trust Company	1	$25.9M	0.44%	-0.12 pts	-19.9%
26	Woodforest National Bank	1	$4.1M	0.07%	0.00 pts	-3.3%

About this list

Deposits are those held at each institution's offices in St. Clair 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

Illinois deposits by institution St. Louis, MO-IL metro area Illinois bank directory

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