Lists · Deposits by county
Polk County, IA Bank Deposit Market Share
Principal Bank holds the largest share of deposits in Polk County, IA, 28.8%, followed by Bankers Trust Company (17.1%) and Wells Fargo Bank, N.A. (10.1%). 39 institutions hold $32.18B at 132 offices as of June 30, 2026, up 7.9% from 2025.
Largest share changes since 2025
Gained: Bankers Trust Company (2.24 points); Bank of America, N.A. (0.96 points); Principal Bank (0.67 points).
Lost: U.S. Bank N.A. (-1.66 points); West Bank (-0.84 points); Wells Fargo Bank, N.A. (-0.78 points).
| # | Institution | Deposits | Market share | Share change from 2025 |
|---|---|---|---|---|
| 1 | Principal Bank | $9.26B | 28.78% | +0.67 pts |
| 2 | Bankers Trust Company | $5.50B | 17.09% | +2.24 pts |
| 3 | Wells Fargo Bank, N.A. | $3.25B | 10.10% | -0.78 pts |
| 4 | U.S. Bank N.A. | $2.94B | 9.13% | -1.66 pts |
| 5 | Bank of America, N.A. | $2.86B | 8.88% | +0.96 pts |
| 6 | West Bank | $2.45B | 7.60% | -0.84 pts |
| 7 | Community State Bank | $1.24B | 3.86% | -0.34 pts |
| 8 | First Interstate Bank | $531.1M | 1.65% | -0.19 pts |
| 9 | Northwest Bank | $409.7M | 1.27% | +0.04 pts |
| 10 | Iowa State Bank | $392.0M | 1.22% | -0.05 pts |
| 11 | Central Bank | $359.5M | 1.12% | -0.03 pts |
| 12 | Visionbank of Iowa | $355.2M | 1.10% | +0.23 pts |
| 13 | Lincoln Savings Bank | $304.3M | 0.95% | -0.01 pts |
| 14 | BMO Bank N.A. | $291.9M | 0.91% | -0.10 pts |
| 15 | Midwest Heritage Bank, FSB | $257.0M | 0.80% | +0.01 pts |
| 16 | Luana Savings Bank | $185.4M | 0.58% | -0.02 pts |
| 17 | First National Bank Ames, Iowa | $180.4M | 0.56% | -0.02 pts |
| 18 | Bank Iowa | $161.4M | 0.50% | -0.08 pts |
| 19 | Charter Bank | $152.0M | 0.47% | -0.01 pts |
| 20 | Grinnell State Bank | $129.4M | 0.40% | -0.02 pts |
| 21 | State Savings Bank | $122.0M | 0.38% | +0.03 pts |
| 22 | City State Bank | $105.1M | 0.33% | -0.04 pts |
| 23 | Peoples Bank | $96.9M | 0.30% | +0.07 pts |
| 24 | Great Southern Bank | $96.5M | 0.30% | -0.04 pts |
| 25 | JPMorgan Chase Bank, N.A. | $93.4M | 0.29% | +0.03 pts |
| 26 | First Mid Bank & Trust, N.A. | $85.3M | 0.27% | +0.27 pts |
| 27 | Availa Bank | $51.2M | 0.16% | 0.00 pts |
| 28 | Regions Bank | $50.6M | 0.16% | -0.03 pts |
| 29 | Raccoon Valley Bank | $50.0M | 0.16% | +0.02 pts |
| 30 | Home State Bank | $45.7M | 0.14% | -0.01 pts |
| 31 | Freedom Financial Bank | $40.6M | 0.13% | +0.00 pts |
| 32 | Earlham Savings Bank | $38.2M | 0.12% | -0.01 pts |
| 33 | Liberty National Bank | $25.9M | 0.08% | +0.01 pts |
| 34 | Trubank | $19.2M | 0.06% | 0.00 pts |
| 35 | UMB Bank, N.A. | $18.3M | 0.06% | -0.03 pts |
| 36 | Keystone Savings Bank | $18.2M | 0.06% | +0.00 pts |
| 37 | Twin Cedars Bank | $16.3M | 0.05% | -0.01 pts |
| 38 | Nicolet National Bank | $5.7M | 0.02% | +0.02 pts |
| 39 | Its Bank | $500K | <0.01% | 0.00 pts |
About this list
Deposits are those held at each institution's offices in Polk 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.
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