Exhibit 23.3
Consent of Independent Registered Public Accounting Firm
The Board of Directors
Cadence Bancorporation:
We consent to the incorporation by reference of our report dated March 25, 2016, with respect to the consolidated statements of income, comprehensive income, changes in shareholders’ equity and cash flows of Cadence Bancorporation for the year ended December 31, 2015, which report appears in the December 31, 2017 annual report onForm 10-K of Cadence Bancorporation and to the reference to our firm under the heading “Experts” in the prospectus.
| /s/ KPMG LLP |
| Houston, Texas |
| January 2, 2019 |