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Capital and Regulatory Matters (Tables) | 12 Months Ended
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Dec. 31, 2017
Regulatory Capital Requirements [Abstract] |
Actual and Required Capital Ratios |
| Actual |  | Minimum Capital Required - Basel III Phase-In Schedule |  | Minimum Capital Required - Basel III Fully Phased-In |  | Required to be Considered Well Capitalized
| Capital Amount |  | Ratio |  | Capital Amount |  | Ratio |  | Capital Amount |  | Ratio |  | Capital Amount |  | Ratio
2017 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common Equity Tier 1 to Risk-Weighted Assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cullen/Frost | $ | 2,426,048 |  |  | 12.42 | % |  | $ | 1,123,430 |  |  | 5.75 | % |  | $ | 1,367,583 |  |  | 7.00 | % |  | $ | 1,269,965 |  |  | 6.50 | %
Frost Bank | 2,518,999 |  |  | 12.92 |  |  | 1,120,663 |  |  | 5.75 |  |  | 1,364,214 |  |  | 7.00 |  |  | 1,266,836 |  |  | 6.50 |
Tier 1 Capital to Risk-Weighted Assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cullen/Frost | 2,570,534 |  |  | 13.16 |  |  | 1,416,499 |  |  | 7.25 |  |  | 1,660,637 |  |  | 8.50 |  |  | 1,563,033 |  |  | 8.00 |
Frost Bank | 2,518,999 |  |  | 12.92 |  |  | 1,413,010 |  |  | 7.25 |  |  | 1,656,546 |  |  | 8.50 |  |  | 1,559,183 |  |  | 8.00 |
Total Capital to Risk-Weighted Assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cullen/Frost | 2,959,326 |  |  | 15.15 |  |  | 1,807,257 |  |  | 9.25 |  |  | 2,051,375 |  |  | 10.50 |  |  | 1,953,792 |  |  | 10.00 |
Frost Bank | 2,674,791 |  |  | 13.72 |  |  | 1,802,805 |  |  | 9.25 |  |  | 2,046,321 |  |  | 10.50 |  |  | 1,948,979 |  |  | 10.00 |
Leverage Ratio |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cullen/Frost | 2,570,534 |  |  | 8.46 |  |  | 1,215,227 |  |  | 4.00 |  |  | 1,215,186 |  |  | 4.00 |  |  | 1,519,034 |  |  | 5.00 |
Frost Bank | 2,518,999 |  |  | 8.30 |  |  | 1,214,295 |  |  | 4.00 |  |  | 1,214,254 |  |  | 4.00 |  |  | 1,517,869 |  |  | 5.00 |
2016 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common Equity Tier 1 to Risk-Weighted Assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cullen/Frost | $ | 2,239,186 |  |  | 12.52 | % |  | $ | 916,360 |  |  | 5.125 | % |  | $ | 1,251,425 |  |  | 7.00 | % |  | $ | 1,162,213 |  |  | 6.50 | %
Frost Bank | 2,296,480 |  |  | 12.88 |  |  | 913,460 |  |  | 5.125 |  |  | 1,247,463 |  |  | 7.00 |  |  | 1,158,535 |  |  | 6.50 |
Tier 1 Capital to Risk-Weighted Assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cullen/Frost | 2,383,672 |  |  | 13.33 |  |  | 1,184,563 |  |  | 6.625 |  |  | 1,519,587 |  |  | 8.50 |  |  | 1,430,416 |  |  | 8.00 |
Frost Bank | 2,296,480 |  |  | 12.88 |  |  | 1,180,814 |  |  | 6.625 |  |  | 1,514,776 |  |  | 8.50 |  |  | 1,425,889 |  |  | 8.00 |
Total Capital to Risk-Weighted Assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cullen/Frost | 2,669,717 |  |  | 14.93 |  |  | 1,542,168 |  |  | 8.625 |  |  | 1,877,137 |  |  | 10.50 |  |  | 1,788,020 |  |  | 10.00 |
Frost Bank | 2,449,525 |  |  | 13.74 |  |  | 1,537,286 |  |  | 8.625 |  |  | 1,871,194 |  |  | 10.50 |  |  | 1,782,361 |  |  | 10.00 |
Leverage Ratio |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cullen/Frost | 2,383,672 |  |  | 8.14 |  |  | 1,171,682 |  |  | 4.00 |  |  | 1,171,573 |  |  | 4.00 |  |  | 1,464,602 |  |  | 5.00 |
Frost Bank | 2,296,480 |  |  | 7.85 |  |  | 1,170,249 |  |  | 4.00 |  |  | 1,170,141 |  |  | 4.00 |  |  | 1,462,812 |  |  | 5.00 |

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