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Capital and Regulatory Matters (Tables) | 9 Months Ended
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Sep. 30, 2022
Banking Regulation, Common Equity Tier One Risk-Based Capital [Abstract] |
Actual and Required Capital Ratios | The following table presents actual and required capital ratios as of September 30, 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. See the 2021 Form 10-K for a more detailed discussion of 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
September 30, 2022 |  |  |  |  |  |  |  |  |  |  |
Common Equity Tier 1 to Risk-Weighted Assets |  |  |  |  |  |  |  |  |  |  |
Cullen/Frost | $ | 3,606,527 |  |  | 12.74 | % |  | $ | 1,981,042 |  |  | 7.00 | % |  | N/A |  | N/A
Frost Bank | 3,595,393 |  |  | 12.71 |  |  | 1,979,976 |  |  | 7.00 |  |  | 1,838,550 |  |  | 6.50 | %
Tier 1 Capital to Risk-Weighted Assets |  |  |  |  |  |  |  |  |  |  |
Cullen/Frost | 3,751,979 |  |  | 13.26 |  |  | 2,405,550 |  |  | 8.50 |  |  | 1,698,036 |  |  | 6.00 |
Frost Bank | 3,595,393 |  |  | 12.71 |  |  | 2,404,257 |  |  | 8.50 |  |  | 2,262,830 |  |  | 8.00 |
Total Capital to Risk-Weighted Assets |  |  |  |  |  |  |  |  |  |  |
Cullen/Frost | 4,187,120 |  |  | 14.80 |  |  | 2,971,562 |  |  | 10.50 |  |  | 2,830,059 |  |  | 10.00 |
Frost Bank | 3,830,534 |  |  | 13.54 |  |  | 2,969,965 |  |  | 10.50 |  |  | 2,828,538 |  |  | 10.00 |
Leverage Ratio |  |  |  |  |  |  |  |  |  |  |
Cullen/Frost | 3,751,979 |  |  | 7.09 |  |  | 2,117,091 |  |  | 4.00 |  |  | N/A |  | N/A
Frost Bank | 3,595,393 |  |  | 6.79 |  |  | 2,117,519 |  |  | 4.00 |  |  | 2,646,898 |  |  | 5.00 |
December 31, 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 |

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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 http://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 http://asc.fasb.org/extlink&oid=117337116&loc=SL5958568-112826 + Details
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