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Capital and Regulatory Matters (Tables) | 6 Months Ended
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Jun. 30, 2013
Banking And Thrift [Abstract] |
Actual and Required Capital Ratios | 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 |
June 30, 2013 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total Capital to Risk-Weighted Assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cullen/Frost |  | $ | 2,011,267 |  |  |  | 15.39 | % |  | $ | 1,045,233 |  |  |  | 8.00 | % |  | $ | 1,306,541 |  |  |  | 10.00 | %
Frost Bank |  |  | 1,767,524 |  |  |  | 13.54 |  |  |  | 1,044,199 |  |  |  | 8.00 |  |  |  | 1,305,249 |  |  |  | 10.00 |
Tier 1 Capital to Risk-Weighted Assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cullen/Frost |  |  | 1,857,867 |  |  |  | 14.22 |  |  |  | 522,616 |  |  |  | 4.00 |  |  |  | 783,925 |  |  |  | 6.00 |
Frost Bank |  |  | 1,674,124 |  |  |  | 12.83 |  |  |  | 522,099 |  |  |  | 4.00 |  |  |  | 783,149 |  |  |  | 6.00 |
Leverage Ratio |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cullen/Frost |  |  | 1,857,867 |  |  |  | 8.60 |  |  |  | 864,342 |  |  |  | 4.00 |  |  |  | 1,080,427 |  |  |  | 5.00 |
Frost Bank |  |  | 1,674,124 |  |  |  | 7.75 |  |  |  | 863,558 |  |  |  | 4.00 |  |  |  | 1,079,448 |  |  |  | 5.00 |
December 31, 2012 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total Capital to Risk-Weighted Assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cullen/Frost |  | $ | 1,947,974 |  |  |  | 15.11 | % |  | $ | 1,031,526 |  |  |  | 8.00 | % |  | $ | 1,289,408 |  |  |  | 10.00 | %
Frost Bank |  |  | 1,730,444 |  |  |  | 13.43 |  |  |  | 1,030,878 |  |  |  | 8.00 |  |  |  | 1,288,597 |  |  |  | 10.00 |
Tier 1 Capital to Risk-Weighted Assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cullen/Frost |  |  | 1,763,521 |  |  |  | 13.68 |  |  |  | 515,763 |  |  |  | 4.00 |  |  |  | 773,645 |  |  |  | 6.00 |
Frost Bank |  |  | 1,625,991 |  |  |  | 12.62 |  |  |  | 515,439 |  |  |  | 4.00 |  |  |  | 773,158 |  |  |  | 6.00 |
Leverage Ratio |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cullen/Frost |  |  | 1,763,521 |  |  |  | 8.28 |  |  |  | 851,483 |  |  |  | 4.00 |  |  |  | 1,064,354 |  |  |  | 5.00 |
Frost Bank |  |  | 1,625,991 |  |  |  | 7.64 |  |  |  | 850,954 |  |  |  | 4.00 |  |  |  | 1,063,693 |  |  |  | 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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