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Capital and Regulatory Matters (Tables) | 12 Months Ended
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Dec. 31, 2023
Broker-Dealer, Net Capital Requirement, SEC Regulation [Abstract] |
Actual and Required Capital Ratios | The following table presents actual and required capital ratios as of December 31, 2023 and December 31, 2022 for Cullen/Frost and Frost Bank under the Basel III Capital Rules. Capital levels required to be considered well capitalized are based upon prompt corrective action regulations, as amended to reflect the changes under the Basel III Capital Rules.
| Actual |  | Minimum Capital Required Plus Capital Conservation Buffer |  | Required to be Considered Well Capitalized(1)
| Capital Amount |  | Ratio |  | Capital Amount |  | Ratio |  | Capital Amount |  | Ratio
2023 |  |  |  |  |  |  |  |  |  |  |
Common Equity Tier 1 to Risk-Weighted Assets |  |  |  |  |  |  |  |  |  |  |
Cullen/Frost | $ | 4,036,945 |  |  | 13.25 | % |  | $ | 2,132,516 |  |  | 7.00 | % |  | N/A |  | N/A
Frost Bank | 4,057,111 |  |  | 13.33 |  |  | 2,129,784 |  |  | 7.00 |  |  | $ | 1,977,656 |  |  | 6.50 | %
Tier 1 Capital to Risk-Weighted Assets |  |  |  |  |  |  |  |  |  |  |
Cullen/Frost | 4,182,397 |  |  | 13.73 |  |  | 2,589,484 |  |  | 8.50 |  |  | 1,827,871 |  |  | 6.00 |
Frost Bank | 4,057,111 |  |  | 13.33 |  |  | 2,586,166 |  |  | 8.50 |  |  | 2,434,038 |  |  | 8.00 |
Total Capital to Risk-Weighted Assets |  |  |  |  |  |  |  |  |  |  |
Cullen/Frost | 4,625,760 |  |  | 15.18 |  |  | 3,198,774 |  |  | 10.50 |  |  | 3,046,452 |  |  | 10.00 |
Frost Bank | 4,320,474 |  |  | 14.20 |  |  | 3,194,676 |  |  | 10.50 |  |  | 3,042,548 |  |  | 10.00 |
Leverage Ratio |  |  |  |  |  |  |  |  |  |  |
Cullen/Frost | 4,182,397 |  |  | 8.35 |  |  | 2,003,020 |  |  | 4.00 |  |  | N/A |  | N/A
Frost Bank | 4,057,111 |  |  | 8.10 |  |  | 2,003,152 |  |  | 4.00 |  |  | 2,503,940 |  |  | 5.00 |
2022 |  |  |  |  |  |  |  |  |  |  |
Common Equity Tier 1 to Risk-Weighted Assets |  |  |  |  |  |  |  |  |  |  |
Cullen/Frost | $ | 3,751,200 |  |  | 12.85 | % |  | $ | 2,042,876 |  |  | 7.00 | % |  | N/A |  | N/A
Frost Bank | 3,789,056 |  |  | 13.00 |  |  | 2,040,388 |  |  | 7.00 |  |  | $ | 1,894,646 |  |  | 6.50 | %
Tier 1 Capital to Risk-Weighted Assets |  |  |  |  |  |  |  |  |  |  |
Cullen/Frost | 3,896,652 |  |  | 13.35 |  |  | 2,480,635 |  |  | 8.50 |  |  | 1,751,036 |  |  | 6.00 |
Frost Bank | 3,789,056 |  |  | 13.00 |  |  | 2,477,614 |  |  | 8.50 |  |  | 2,331,872 |  |  | 8.00 |
Total Capital to Risk-Weighted Assets |  |  |  |  |  |  |  |  |  |  |
Cullen/Frost | 4,330,982 |  |  | 14.84 |  |  | 3,064,313 |  |  | 10.50 |  |  | 2,918,394 |  |  | 10.00 |
Frost Bank | 4,023,386 |  |  | 13.80 |  |  | 3,060,583 |  |  | 10.50 |  |  | 2,914,841 |  |  | 10.00 |
Leverage Ratio |  |  |  |  |  |  |  |  |  |  |
Cullen/Frost | 3,896,652 |  |  | 7.29 |  |  | 2,136,680 |  |  | 4.00 |  |  | N/A |  | N/A
Frost Bank | 3,789,056 |  |  | 7.09 |  |  | 2,136,316 |  |  | 4.00 |  |  | 2,670,395 |  |  | 5.00 |
____________________ (1)“Well-capitalized” minimum Common Equity Tier 1 to Risk-Weighted Assets and Leverage Ratio are not formally defined under applicable banking regulations for bank holding companies.

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- Definition Tabular disclosure of the capital amounts and ratios as of the balance sheet date, indicating whether the entity or entities are in compliance with regulatory capital requirements, by entity. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 942 -SubTopic 505 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (c)(1) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480696/942-505-50-1 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 942 -SubTopic 505 -Name Accounting Standards Codification -Section 50 -Paragraph 1B -Publisher FASB -URI https://asc.fasb.org//1943274/2147480696/942-505-50-1B + Details
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