Cornerstone Bank holds $1.6B in deposits across 8 counties in 4 ranked markets and 2 states. Its deposit footprint is highly concentrated: the top three counties (Mountrail County, Mckenzie County, Burleigh County) hold 70% of its deposits, and North Dakota accounts for 97% of the total. It ranks among the three largest institutions in 2 of the 8 counties where it operates.
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Data as of June 30, 2025 (FDIC Summary of Deposits)
| County | Deposits | County’s % of Bank’s Deposits | Bank’s % of County Deposits | Branches | |
|---|---|---|---|---|---|
| 1. | Mountrail County, ND | $545M | 34.6% | 54.0% | 4 |
| 2. | Mckenzie County, ND | $296M | 18.8% | 21.7% | 1 |
| 3. | Burleigh County, ND | $263M | 16.7% | 5.2% | 1 |
| 4. | Cass County, ND | $229M | 14.5% | 2.1% | 1 |
| 5. | Ward County, ND | $106M | 6.8% | 3.3% | 2 |
| 6. | Stark County, ND | $84M | 5.3% | 4.3% | 1 |
| 7. | Lincoln County, SD | $40M | 2.5% | 0.0% | 1 |
| 8. | Pierce County, ND | $12M | 0.8% | 4.3% | 1 |
Deposits are as reported to the FDIC at branch level, June 30, 2025, and are nominal. “County’s % of Bank’s Deposits” is this county’s share of the institution’s total deposits; “Bank’s % of County Deposits” is this institution’s deposits as a percent of all deposits booked in that county. Counties within a Combined or Metropolitan Statistical Area link to their full profile; other counties are shown for completeness.
All 293 markets and the 1,533 counties within a CSA or MSA are covered in the Market Intelligence resource. See the methodology for how each figure is built and when to expect updates.