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Capital and Regulatory Matters (Tables) | 12 Months Ended
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Dec. 31, 2022
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, 2022 and December 31, 2021 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
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 |
2021 |  |  |  |  |  |  |  |  |  |  |
Common Equity Tier 1 to Risk-Weighted Assets |  |  |  |  |  |  |  |  |  |  |
Cullen/Frost | $ | 3,371,043 |  |  | 13.13 | % |  | $ | 1,796,549 |  |  | 7.00 | % |  | N/A |  | N/A
Frost Bank | 3,261,532 |  |  | 12.72 |  |  | 1,795,221 |  |  | 7.00 |  |  | $ | 1,666,991 |  |  | 6.50 | %
Tier 1 Capital to Risk-Weighted Assets |  |  |  |  |  |  |  |  |  |  |
Cullen/Frost | 3,516,495 |  |  | 13.70 |  |  | 2,181,523 |  |  | 8.50 |  |  | 1,539,899 |  |  | 6.00 |
Frost Bank | 3,261,532 |  |  | 12.72 |  |  | 2,179,911 |  |  | 8.50 |  |  | 2,051,681 |  |  | 8.00 |
Total Capital to Risk-Weighted Assets |  |  |  |  |  |  |  |  |  |  |
Cullen/Frost | 3,966,244 |  |  | 15.45 |  |  | 2,694,823 |  |  | 10.50 |  |  | 2,566,498 |  |  | 10.00 |
Frost Bank | 3,491,281 |  |  | 13.61 |  |  | 2,692,831 |  |  | 10.50 |  |  | 2,564,601 |  |  | 10.00 |
Leverage Ratio |  |  |  |  |  |  |  |  |  |  |
Cullen/Frost | 3,516,495 |  |  | 7.34 |  |  | 1,917,533 |  |  | 4.00 |  |  | N/A |  | N/A
Frost Bank | 3,261,532 |  |  | 6.80 |  |  | 1,917,679 |  |  | 4.00 |  |  | 2,397,099 |  |  | 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 -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1B -URI https://asc.fasb.org/extlink&oid=117337116&loc=SL5958570-112826 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1 -Subparagraph (c)(1) -URI https://asc.fasb.org/extlink&oid=117337116&loc=SL5958568-112826 + Details
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