Cover |
12 Months Ended |
|---|---|
Dec. 31, 2025 | |
| Cover [Abstract] | |
| Document Type | 11-K |
| Entity Registrant Name | CULLEN/FROST BANKERS, INC. |
| Entity Central Index Key | 0000039263 |
| Amendment Flag | false |
| X | ||||||||||
- Definition Boolean flag that is true when the XBRL content amends previously-filed or accepted submission. No definition available.
|
| X | ||||||||||
- Definition Cover page. No definition available.
|
| X | ||||||||||
- Definition The type of document being provided (such as 10-K, 10-Q, 485BPOS, etc). The document type is limited to the same value as the supporting SEC submission type, or the word 'Other'. No definition available.
|
| X | ||||||||||
- Definition A unique 10-digit SEC-issued value to identify entities that have filed disclosures with the SEC. It is commonly abbreviated as CIK. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
- Definition The exact name of the entity filing the report as specified in its charter, which is required by forms filed with the SEC. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|