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Capital and Regulatory Matters (Tables) | 9 Months Ended
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Sep. 30, 2015
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 September 30, 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.
| 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
September 30, 2015 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common Equity Tier 1 to Risk-Weighted Assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cullen/Frost | $ | 1,979,694 |  |  | 11.57 | % |  | $ | 769,754 |  |  | 4.50 | % |  | $ | 1,197,002 |  |  | 7.00 | % |  | $ | 1,111,867 |  |  | 6.50 | %
Frost Bank | 2,111,113 |  |  | 12.38 |  |  | 767,137 |  |  | 4.50 |  |  | 1,192,930 |  |  | 7.00 |  |  | 1,108,086 |  |  | 6.50 |
Tier 1 Capital to Risk-Weighted Assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cullen/Frost | 2,157,430 |  |  | 12.61 |  |  | 1,026,339 |  |  | 6.00 |  |  | 1,453,503 |  |  | 8.50 |  |  | 1,368,452 |  |  | 8.00 |
Frost Bank | 2,111,113 |  |  | 12.38 |  |  | 1,022,849 |  |  | 6.00 |  |  | 1,448,558 |  |  | 8.50 |  |  | 1,363,798 |  |  | 8.00 |
Total Capital to Risk-Weighted Assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cullen/Frost | 2,387,553 |  |  | 13.96 |  |  | 1,368,452 |  |  | 8.00 |  |  | 1,795,503 |  |  | 10.50 |  |  | 1,710,565 |  |  | 10.00 |
Frost Bank | 2,221,486 |  |  | 13.03 |  |  | 1,363,798 |  |  | 8.00 |  |  | 1,789,396 |  |  | 10.50 |  |  | 1,704,748 |  |  | 10.00 |
Leverage Ratio |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cullen/Frost | 2,157,430 |  |  | 7.91 |  |  | 1,091,452 |  |  | 4.00 |  |  | 1,091,227 |  |  | 4.00 |  |  | 1,364,315 |  |  | 5.00 |
Frost Bank | 2,111,113 |  |  | 7.75 |  |  | 1,090,250 |  |  | 4.00 |  |  | 1,090,025 |  |  | 4.00 |  |  | 1,362,812 |  |  | 5.00 |
Year end schedule of compliance with regulatory capital requirements under banking regulations [Table Text Block] | The following table presents actual and required capital ratios as of December 31, 2014 for Cullen/Frost and Frost Bank under the regulatory capital rules then in effect.
| Actual |  | Minimum Required for Capital Adequacy Purposes |  | Required to be Considered Well Capitalized
| Capital Amount |  | Ratio |  | Capital Amount |  | Ratio |  | Capital Amount |  | Ratio
December 31, 2014 |  |  |  |  |  |  |  |  |  |  |
Tier 1 Capital to Risk-Weighted Assets |  |  |  |  |  |  |  |  |  |  |
Cullen/Frost | $ | 2,185,558 |  |  | 13.67 | % |  | $ | 639,398 |  |  | 4.00 | % |  | $ | 959,098 |  |  | 6.00 | %
Frost Bank | 1,978,697 |  |  | 12.41 |  |  | 637,929 |  |  | 4.00 |  |  | 956,894 |  |  | 6.00 |
Total Capital to Risk-Weighted Assets |  |  |  |  |  |  |  |  |  |  |
Cullen/Frost | 2,325,100 |  |  | 14.55 |  |  | 1,278,797 |  |  | 8.00 |  |  | 1,598,496 |  |  | 10.00 |
Frost Bank | 2,070,293 |  |  | 12.98 |  |  | 1,275,858 |  |  | 8.00 |  |  | 1,594,823 |  |  | 10.00 |
Leverage Ratio |  |  |  |  |  |  |  |  |  |  |
Cullen/Frost | 2,185,558 |  |  | 8.16 |  |  | 1,072,035 |  |  | 4.00 |  |  | 1,340,043 |  |  | 5.00 |
Frost Bank | 1,978,697 |  |  | 7.40 |  |  | 1,070,109 |  |  | 4.00 |  |  | 1,337,636 |  |  | 5.00 |

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