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Capital and Regulatory Matters (Tables) | 12 Months Ended
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Dec. 31, 2020
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, 2020 and December 31, 2019 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 - Basel III Fully Phased-In |  | Required to be Considered Well Capitalized
| Capital Amount |  | Ratio |  | Capital Amount |  | Ratio |  | Capital Amount |  | Ratio
2020 |  |  |  |  |  |  |  |  |  |  |
Common Equity Tier 1 to Risk-Weighted Assets |  |  |  |  |  |  |  |  |  |  |
Cullen/Frost | $ | 3,058,447 |  |  | 12.86 | % |  | $ | 1,664,867 |  |  | 7.00 | % |  | $ | 1,545,948 |  |  | 6.50 | %
Frost Bank | 3,030,093 |  |  | 12.77 |  |  | 1,661,620 |  |  | 7.00 |  |  | 1,542,933 |  |  | 6.50 |
Tier 1 Capital to Risk-Weighted Assets |  |  |  |  |  |  |  |  |  |  |
Cullen/Frost | 3,203,899 |  |  | 13.47 |  |  | 2,021,624 |  |  | 8.50 |  |  | 1,902,705 |  |  | 8.00 |
Frost Bank | 3,030,093 |  |  | 12.77 |  |  | 2,017,682 |  |  | 8.50 |  |  | 1,898,995 |  |  | 8.00 |
Total Capital to Risk-Weighted Assets |  |  |  |  |  |  |  |  |  |  |
Cullen/Frost | 3,672,912 |  |  | 15.44 |  |  | 2,497,300 |  |  | 10.50 |  |  | 2,378,381 |  |  | 10.00 |
Frost Bank | 3,266,106 |  |  | 13.76 |  |  | 2,492,430 |  |  | 10.50 |  |  | 2,373,743 |  |  | 10.00 |
Leverage Ratio |  |  |  |  |  |  |  |  |  |  |
Cullen/Frost | 3,203,899 |  |  | 8.07 |  |  | 1,589,004 |  |  | 4.00 |  |  | 1,986,255 |  |  | 5.00 |
Frost Bank | 3,030,093 |  |  | 7.63 |  |  | 1,588,200 |  |  | 4.00 |  |  | 1,985,250 |  |  | 5.00 |
2019 |  |  |  |  |  |  |  |  |  |  |
Common Equity Tier 1 to Risk-Weighted Assets |  |  |  |  |  |  |  |  |  |  |
Cullen/Frost | $ | 2,857,250 |  |  | 12.36 | % |  | $ | 1,617,886 |  |  | 7.00 | % |  | $ | 1,502,323 |  |  | 6.50 | %
Frost Bank | 2,958,326 |  |  | 12.82 |  |  | 1,615,206 |  |  | 7.00 |  |  | 1,499,834 |  |  | 6.50 |
Tier 1 Capital to Risk-Weighted Assets |  |  |  |  |  |  |  |  |  |  |
Cullen/Frost | 3,001,736 |  |  | 12.99 |  |  | 1,964,576 |  |  | 8.50 |  |  | 1,849,013 |  |  | 8.00 |
Frost Bank | 2,958,326 |  |  | 12.82 |  |  | 1,961,322 |  |  | 8.50 |  |  | 1,845,950 |  |  | 8.00 |
Total Capital to Risk-Weighted Assets |  |  |  |  |  |  |  |  |  |  |
Cullen/Frost | 3,367,403 |  |  | 14.57 |  |  | 2,426,829 |  |  | 10.50 |  |  | 2,311,266 |  |  | 10.00 |
Frost Bank | 3,090,993 |  |  | 13.40 |  |  | 2,422,809 |  |  | 10.50 |  |  | 2,307,438 |  |  | 10.00 |
Leverage Ratio |  |  |  |  |  |  |  |  |  |  |
Cullen/Frost | 3,001,736 |  |  | 9.28 |  |  | 1,293,188 |  |  | 4.00 |  |  | 1,616,485 |  |  | 5.00 |
Frost Bank | 2,958,326 |  |  | 9.15 |  |  | 1,292,743 |  |  | 4.00 |  |  | 1,615,929 |  |  | 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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