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Capital and Regulatory Matters (Tables) | 12 Months Ended
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Dec. 31, 2014
Regulatory Capital Requirements [Abstract] |
Actual and Required Capital Ratios | Year-end actual and required capital ratios for Cullen/Frost and Frost Bank were as follows:
| Actual |  | Minimum Required for Capital Adequacy Purposes |  | Required to be Considered Well Capitalized
| Capital Amount |  | Ratio |  | Capital Amount |  | Ratio |  | Capital Amount |  | Ratio
2014 |  |  |  |  |  |  |  |  |  |  |
Total Capital to Risk-Weighted Assets |  |  |  |  |  |  |  |  |  |  |
Cullen/Frost | $ | 2,325,818 |  |  | 14.55 | % |  | $ | 1,278,797 |  |  | 8.00 | % |  | $ | 1,598,496 |  |  | 10.00 | %
Frost Bank | 2,071,012 |  |  | 12.99 |  |  | 1,275,858 |  |  | 8.00 |  |  | 1,594,823 |  |  | 10.00 |
Tier 1 Capital to Risk-Weighted Assets |  |  |  |  |  |  |  |  |  |  |
Cullen/Frost | 2,186,276 |  |  | 13.68 |  |  | 639,398 |  |  | 4.00 |  |  | 959,098 |  |  | 6.00 |
Frost Bank | 1,979,415 |  |  | 12.41 |  |  | 637,929 |  |  | 4.00 |  |  | 956,894 |  |  | 6.00 |
Leverage Ratio |  |  |  |  |  |  |  |  |  |  |
Cullen/Frost | 2,186,276 |  |  | 8.16 |  |  | 1,072,035 |  |  | 4.00 |  |  | 1,340,043 |  |  | 5.00 |
Frost Bank | 1,979,415 |  |  | 7.40 |  |  | 1,070,109 |  |  | 4.00 |  |  | 1,337,636 |  |  | 5.00 |
2013 |  |  |  |  |  |  |  |  |  |  |
Total Capital to Risk-Weighted Assets |  |  |  |  |  |  |  |  |  |  |
Cullen/Frost | $ | 2,110,774 |  |  | 15.52 | % |  | $ | 1,088,349 |  |  | 8.00 | % |  | $ | 1,360,437 |  |  | 10.00 | %
Frost Bank | 1,780,313 |  |  | 13.12 |  |  | 1,085,447 |  |  | 8.00 |  |  | 1,356,809 |  |  | 10.00 |
Tier 1 Capital to Risk-Weighted Assets |  |  |  |  |  |  |  |  |  |  |
Cullen/Frost | 1,958,336 |  |  | 14.39 |  |  | 544,175 |  |  | 4.00 |  |  | 816,262 |  |  | 6.00 |
Frost Bank | 1,707,307 |  |  | 12.58 |  |  | 542,724 |  |  | 4.00 |  |  | 814,085 |  |  | 6.00 |
Leverage Ratio |  |  |  |  |  |  |  |  |  |  |
Cullen/Frost | 1,958,336 |  |  | 8.49 |  |  | 922,728 |  |  | 4.00 |  |  | 1,153,410 |  |  | 5.00 |
Frost Bank | 1,707,307 |  |  | 7.42 |  |  | 920,107 |  |  | 4.00 |  |  | 1,150,134 |  |  | 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/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1H -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=7881181&loc=d3e65071-112826 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=7881181&loc=SL5958568-112826 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1B -URI http://asc.fasb.org/extlink&oid=7881181&loc=SL5958570-112826 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1G -URI http://asc.fasb.org/extlink&oid=7881181&loc=SL5958577-112826 + Details
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