The news
In the Third Coast Great Plains acquisition, Houston-based Third Coast Bancshares (TCBX) said on October 7, 2026, that it agreed to buy Great Plains Bancshares, parent of Oklahoma City's Great Plains National Bank, in an all-stock deal valued at about $239.6 million, entering Oklahoma.
The value is based on Third Coast's closing share price on October 6, according to the companies' joint announcement filed with the Securities and Exchange Commission. Third Coast expects to issue 5,570,352 shares. After closing, Third Coast shareholders would own about 78% of the combined company and Great Plains shareholders about 22%.
Great Plains had about $1.9 billion in assets, $1.7 billion in gross loans and $1.7 billion in deposits as of June 30, 2026, the filing says. It operates 23 branches across Oklahoma and Texas. Third Coast has 20 branches, so the combined bank would have 43 and, on the companies' estimate, about $9 billion in assets. The companies said the deal also expands Third Coast's presence in Dallas.
Great Plains will operate as Great Plains Bank, a division of Third Coast Bank, and its CEO, Mark Russell, will stay in a leadership role. Two Great Plains representatives will join the boards of Third Coast and Third Coast Bank. Both boards approved the deal unanimously; it still needs approval from both companies' shareholders and from regulators. The companies expect it to close in the first quarter of 2027.
Third Coast CEO Bart Caraway said the combination would strengthen the bank's ability to serve businesses and communities in its markets, as reported by Banking Dive. Keefe, Bruyette & Woods advised Third Coast, and Stephens Inc. advised Great Plains. Banking Dive noted Third Coast closed a $123 million purchase of Austin-based Keystone Bancshares in February 2026.
The numbers
- Deal value (stock, as of Oct 6 close)
- ~$239.6 million
- Third Coast shares to be issued
- 5,570,352
- Great Plains assets (June 30, 2026)
- ~$1.9 billion
- Pro forma combined assets (company estimate)
- ~$9 billion
- Combined branches
- 43
- Ownership split TCBX / Great Plains
- 78% / 22%
Why CEOs should care
For business customers of either bank, the near-term change is mostly cosmetic: Great Plains keeps its name as a division and its CEO stays. Treasury and finance teams should still ask their relationship managers how the integration will affect online banking platforms, treasury management products, lending limits and fees, and when any systems conversion is planned. A larger balance sheet can mean bigger loan capacity for mid-size companies.
For bank boards and CFOs at similar-size lenders, the deal is another data point on pricing and structure. All-stock deals preserve capital but make the price depend on the buyer's share price, so the $239.6 million value will move until closing. Boards weighing a sale should be clear on how they value the buyer's stock and what governance seats they can secure, as Great Plains did with two board seats.
Investors should note this is Third Coast's second acquisition announced or closed in 2026, after Keystone. Serial deals raise integration risk; watch credit quality in the acquired loan book and the timeline for regulatory approval.
The bigger picture
Bank mergers have picked up across the US, and this fintech section has covered several, including Peoples Bancorp's $728.1 million deal for Capital Bancorp. Buyers are using scale to spread rising technology and compliance costs and to enter fast-growing markets. For Third Coast, Oklahoma is a new state and Dallas is a deeper foothold.
Faster approvals matter in this trend. Deals that can close within roughly two quarters, as Third Coast and Great Plains project, reduce the period of uncertainty for staff and customers.
What’s next
The next steps are shareholder votes at both companies and regulatory filings. Watch whether the deal closes on its first-quarter 2027 target and how Third Coast reports the integration in its quarterly results.
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