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Story County, IA Bank Deposit Market Share

First National Bank Ames, Iowa holds the largest share of deposits in Story County, IA, 21.7%, followed by U.S. Bank N.A. (11.4%) and South Story Bank & Trust (11.2%). 21 institutions hold $3.10B at 37 offices as of June 30, 2026, up 0.4% from 2025.

Institutions: 21 Offices: 37 Deposits: $3.10B Survey: FDIC Summary of Deposits, June 30, 2026

Largest share changes since 2025

Gained: First National Bank Ames, Iowa (1.16 points); Availa Bank (1.02 points); Bankers Trust Company (0.65 points).

Lost: Visionbank of Iowa (-3.81 points); Reliance State Bank (-0.10 points); BMO Bank N.A. (-0.08 points).

# Institution Offices Deposits Market share Share change from 2025 Deposit change
1 First National Bank Ames, Iowa 3 $674.3M 21.72% +1.16 pts 6.1%
2 U.S. Bank N.A. 2 $353.0M 11.37% +0.06 pts 1.0%
3 South Story Bank & Trust 4 $346.8M 11.17% +0.18 pts 2.1%
4 Availa Bank 2 $328.9M 10.59% +1.02 pts 11.2%
5 Wells Fargo Bank, N.A. 1 $267.0M 8.60% +0.17 pts 2.5%
6 Visionbank of Iowa 4 $184.4M 5.94% -3.81 pts -38.8%
7 State Bank & Trust Co. 1 $174.3M 5.61% +0.06 pts 1.5%
8 Bankers Trust Company 1 $168.1M 5.41% +0.65 pts 14.2%
9 First Interstate Bank 3 $136.7M 4.40% -0.04 pts -0.5%
10 Reliance State Bank 1 $100.9M 3.25% -0.10 pts -2.7%
11 Central State Bank 1 $80.7M 2.60% +0.10 pts 4.5%
12 Exchange State Bank 2 $67.6M 2.18% +0.07 pts 3.6%
13 Northwest Bank 1 $38.1M 1.23% +0.13 pts 12.8%
14 GNB Bank 2 $36.9M 1.19% +0.02 pts 2.0%
15 Security State Bank 2 $29.5M 0.95% -0.08 pts -7.4%
16 Fidelity Bank 2 $27.5M 0.89% +0.04 pts 5.2%
17 BMO Bank N.A. 1 $27.3M 0.88% -0.08 pts -8.0%
18 Maxwell State Bank 1 $27.0M 0.87% +0.11 pts 14.6%
19 Midwest Heritage Bank, FSB 1 $19.7M 0.63% -0.02 pts -1.9%
20 JPMorgan Chase Bank, N.A. 1 $9.3M 0.30% +0.30 pts New
21 TS Bank 1 $7.0M 0.22% +0.05 pts 32.4%

About this list

Deposits are those held at each institution's offices in Story 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

Iowa deposits by institution Ames, IA metro area Iowa bank directory

Other counties in Iowa

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