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Capital and Regulatory Matters | 3 Months Ended
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Mar. 31, 2016
Banking and Thrift [Abstract] |
Capital and Regulatory Matters | Capital and Regulatory Matters Banks and bank holding companies are subject to various regulatory capital requirements administered by state and federal banking agencies. Capital adequacy guidelines and, additionally for banks, prompt corrective action regulations, involve quantitative measures of assets, liabilities, and certain off-balance-sheet items calculated under regulatory accounting practices. Capital amounts and classifications are also subject to qualitative judgments by regulators about components, risk weighting and other factors. Cullen/Frost’s and Frost Bank’s Common Equity Tier 1 capital includes common stock and related paid-in capital, net of treasury stock, and retained earnings. In connection with the adoption of the Basel III Capital Rules, we elected to opt-out of the requirement to include most components of accumulated other comprehensive income in Common Equity Tier 1. Common Equity Tier 1 for both Cullen/Frost and Frost Bank is reduced by, goodwill and other intangible assets, net of associated deferred tax liabilities, and subject to transition provisions. Frost Bank's Common Equity Tier 1 is also reduced by its equity investment in its financial subsidiary, Frost Insurance Agency (“FIA”). Tier 1 capital includes Common Equity Tier 1 capital and additional Tier 1 capital. For Cullen/Frost, additional Tier 1 capital at March 31, 2016 includes $144.5 million of 5.375% non-cumulative perpetual preferred stock. Frost Bank did not have any additional Tier 1 capital beyond Common Equity Tier 1 at March 31, 2016 or December 31, 2015. At December 31, 2015, $33.3 million of trust preferred securities were included in Cullen/Frost's additional Tier 1 capital. Beginning January 1, 2016, trust preferred securities may not be included in Tier 1 capital. Trust preferred securities excluded from additional Tier 1 capital may be included in Tier 2 capital, without limitation. Total capital includes Tier 1 capital and Tier 2 capital. Tier 2 capital for both Cullen/Frost and Frost Bank includes a permissible portion of the allowance for loan losses. Tier 2 capital for Cullen/Frost also includes trust preferred securities that were excluded from Tier 1 capital and qualified subordinated debt. Cullen/Frost's Tier 2 capital included $133.0 million and $99.8 million of trust preferred securities at March 31, 2016 and December 31, 2015, respectively. At December 31, 2015, Tier 2 capital for Cullen/Frost included $20.0 million related to the permissible portion of our aggregate $100.0 million of floating rate subordinated notes. The permissible portion of the notes decreases 20% per year during the final five years of the term of the notes. The notes mature on February 15, 2017 and no longer qualify as Tier 2 capital. The following table presents actual and required capital ratios for 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 |
As of March 31, 2016, capital levels at Cullen/Frost and Frost Bank exceed all capital adequacy requirements under the Basel III Capital Rules on a fully phased-in basis. Based on the ratios presented above, capital levels as of March 31, 2016 at Cullen/Frost and Frost Bank exceed the minimum levels necessary to be considered “well capitalized.” Cullen/Frost and Frost Bank are subject to the regulatory capital requirements administered by the Federal Reserve Board and, for Frost Bank, the Federal Deposit Insurance Corporation (“FDIC”). Regulatory authorities can initiate certain mandatory actions if Cullen/Frost or Frost Bank fail to meet the minimum capital requirements, which could have a direct material effect on our financial statements. Management believes, as of March 31, 2016, that Cullen/Frost and Frost Bank meet all capital adequacy requirements to which they are subject. Stock Repurchase Plans. From time to time, our board of directors has authorized stock repurchase plans. In general, stock repurchase plans allow us to proactively manage our capital position and return excess capital to shareholders. Shares purchased under such plans also provide us with shares of common stock necessary to satisfy obligations related to stock compensation awards. We did not have any active stock repurchase plans as of March 31, 2016. Dividend Restrictions. In the ordinary course of business, Cullen/Frost is dependent upon dividends from Frost Bank to provide funds for the payment of dividends to shareholders and to provide for other cash requirements. Banking regulations may limit the amount of dividends that may be paid. Approval by regulatory authorities is required if the effect of dividends declared would cause the regulatory capital of Frost Bank to fall below specified minimum levels. Approval is also required if dividends declared exceed the net profits for that year combined with the retained net profits for the preceding two years. Under the foregoing dividend restrictions and while maintaining its “well capitalized” status, at March 31, 2016, Frost Bank could pay aggregate dividends of up to $362.5 million to Cullen/Frost without prior regulatory approval. Under the terms of the junior subordinated deferrable interest debentures that Cullen/Frost has issued to Cullen/Frost Capital Trust II and WNB Capital Trust I, Cullen/Frost has the right at any time during the term of the debentures to defer the payment of interest at any time or from time to time for an extension period not exceeding 20 consecutive quarterly periods with respect to each extension period. In the event that we have elected to defer interest on the debentures, we may not, with certain exceptions, declare or pay any dividends or distributions on our capital stock or purchase or acquire any of our capital stock. Under the terms of our Series A Preferred Stock, in the event that we do not declare and pay dividends on our Series A Preferred Stock for the most recent dividend period, we may not, with certain exceptions, declare or pay dividends on, or purchase, redeem or otherwise acquire, shares of our common stock or any of our securities that rank junior to our Series A Preferred Stock.

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- Definition The entire disclosure for banks, savings institutions, and credit unions, for regulatory capital requirements imposed by the Federal Reserve System (FRB), the Federal Deposit Insurance Corporation (FDIC), the Office of Thrift Supervision (OTS) or for any state imposed capital requirements, as applicable. The disclosure may include (1) a description of regulatory capital requirements (a) for capital adequacy purposes and (b) established by the prompt corrective action provisions of Section 38 of the Federal Depository Insurance Act; (2) the actual or possible material effects of noncompliance with such requirements; (3) whether the entity is in compliance with the regulatory capital requirements including (a) required and actual ratios and amounts of Tier 1 leverage, Tier 1 risk-based, and total risk-based capital, tangible capital (for savings institutions), and Tier 3 capital for market risk (for certain banks and bank holding companies), (b) factors that may significantly affect capital adequacy; (4) the prompt corrective action category in which the entity was classified as of its most recent notification; (5) whether management believes any conditions or events since notification have changed the entity's category. Also may include additional information that might be disclosed in situations where substantial doubt about the entity's ability to continue as a going concern for a reasonable period of time. + References Reference 1: 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=35709795&loc=SL5958577-112826 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1C -URI http://asc.fasb.org/extlink&oid=35709795&loc=SL5958572-112826 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1E -URI http://asc.fasb.org/extlink&oid=35709795&loc=SL5958574-112826 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1H -URI http://asc.fasb.org/extlink&oid=35709795&loc=d3e65071-112826 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1A -URI http://asc.fasb.org/extlink&oid=35709795&loc=SL5958569-112826 Reference 6: 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=35709795&loc=SL5958570-112826 Reference 7: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1F -URI http://asc.fasb.org/extlink&oid=35709795&loc=SL5958575-112826 Reference 8: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=35709795&loc=SL5958568-112826 Reference 9: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1D -URI http://asc.fasb.org/extlink&oid=35709795&loc=SL5958573-112826 + Details
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