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Capital and Regulatory Matters (Tables) | 12 Months Ended
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Dec. 31, 2016
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
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 |
2015 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common Equity Tier 1 to Risk-Weighted Assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cullen/Frost | $ | 1,986,200 |  |  | 11.37 | % |  | $ | 786,344 |  |  | 4.50 | % |  | $ | 1,222,837 |  |  | 7.00 | % |  | $ | 1,135,830 |  |  | 6.50 | %
Frost Bank | 2,131,360 |  |  | 12.24 |  |  | 783,727 |  |  | 4.50 |  |  | 1,218,766 |  |  | 7.00 |  |  | 1,132,049 |  |  | 6.50 |
Tier 1 Capital to Risk-Weighted Assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cullen/Frost | 2,163,936 |  |  | 12.38 |  |  | 1,048,458 |  |  | 6.00 |  |  | 1,484,874 |  |  | 8.50 |  |  | 1,397,944 |  |  | 8.00 |
Frost Bank | 2,131,360 |  |  | 12.24 |  |  | 1,044,969 |  |  | 6.00 |  |  | 1,479,930 |  |  | 8.50 |  |  | 1,393,292 |  |  | 8.00 |
Total Capital to Risk-Weighted Assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cullen/Frost | 2,419,545 |  |  | 13.85 |  |  | 1,397,944 |  |  | 8.00 |  |  | 1,834,256 |  |  | 10.50 |  |  | 1,747,430 |  |  | 10.00 |
Frost Bank | 2,267,219 |  |  | 13.02 |  |  | 1,393,292 |  |  | 8.00 |  |  | 1,828,149 |  |  | 10.50 |  |  | 1,741,615 |  |  | 10.00 |
Leverage Ratio |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cullen/Frost | 2,163,936 |  |  | 7.79 |  |  | 1,111,325 |  |  | 4.00 |  |  | 1,111,117 |  |  | 4.00 |  |  | 1,389,156 |  |  | 5.00 |
Frost Bank | 2,131,360 |  |  | 7.68 |  |  | 1,110,143 |  |  | 4.00 |  |  | 1,109,935 |  |  | 4.00 |  |  | 1,387,679 |  |  | 5.00 |

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