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Capital and Regulatory Matters (Tables) | 3 Months Ended
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Mar. 31, 2016
Banking and Thrift [Abstract] |
Actual and Required Capital Ratios | Cullen/Frost and Frost Bank under the Basel III Capital Rules. The minimum required capital amounts presented include the minimum required capital levels as of March 31, 2016 and December 31, 2015 based on the phase-in provisions of the Basel III Capital Rules and the minimum required capital levels as of January 1, 2019 when the Basel III Capital Rules have been fully phased-in. 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 2015 Form 10-K for a more detailed discussion of the Basel III Capital Rules.
| 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
March 31, 2016 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common Equity Tier 1 to Risk-Weighted Assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cullen/Frost | $ | 2,022,088 |  |  | 11.82 | % |  | $ | 876,768 |  |  | 5.125 | % |  | $ | 1,197,311 |  |  | 7.00 | % |  | $ | 1,111,998 |  |  | 6.50 | %
Frost Bank | 2,168,631 |  |  | 12.72 |  |  | 873,746 |  |  | 5.125 |  |  | 1,193,183 |  |  | 7.00 |  |  | 1,108,165 |  |  | 6.50 |
Tier 1 Capital to Risk-Weighted Assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cullen/Frost | 2,166,574 |  |  | 12.66 |  |  | 1,133,383 |  |  | 6.625 |  |  | 1,453,878 |  |  | 8.50 |  |  | 1,368,613 |  |  | 8.00 |
Frost Bank | 2,168,631 |  |  | 12.72 |  |  | 1,129,476 |  |  | 6.625 |  |  | 1,448,866 |  |  | 8.50 |  |  | 1,363,896 |  |  | 8.00 |
Total Capital to Risk-Weighted Assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cullen/Frost | 2,461,454 |  |  | 14.39 |  |  | 1,475,536 |  |  | 8.625 |  |  | 1,795,967 |  |  | 10.50 |  |  | 1,710,767 |  |  | 10.00 |
Frost Bank | 2,330,511 |  |  | 13.67 |  |  | 1,470,450 |  |  | 8.625 |  |  | 1,789,775 |  |  | 10.50 |  |  | 1,704,870 |  |  | 10.00 |
Leverage Ratio |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cullen/Frost | 2,166,574 |  |  | 7.96 |  |  | 1,088,362 |  |  | 4.00 |  |  | 1,088,233 |  |  | 4.00 |  |  | 1,360,452 |  |  | 5.00 |
Frost Bank | 2,168,631 |  |  | 7.98 |  |  | 1,087,033 |  |  | 4.00 |  |  | 1,086,875 |  |  | 4.00 |  |  | 1,358,754 |  |  | 5.00 |
(continued) | 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
December 31, 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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