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Capital and Regulatory Matters - Additional Information (Detail) $ in Thousands |  |  | 1 Months Ended | 9 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | --- | --- | ---
Feb. 15, 2016 USD ($) | Jan. 01, 2016 | Feb. 28, 2007 | Sep. 30, 2015 USD ($) quarter shares | Sep. 30, 2014 USD ($) shares | Dec. 31, 2014 USD ($) | Jan. 01, 2019 | Apr. 30, 2015 USD ($)
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items] |  |  |  |  |  |  |  |
Stock Repurchase Program, Authorized Amount |  |  |  |  |  |  |  | $ 100,000
Stock Repurchase Program, Period in Force |  |  |  | 2 years |  |  |  |
Treasury Stock, Shares, Acquired | shares |  |  |  | 1,095,308 | 0 |  |  |
Purchase of treasury stock (1,095,308 shares in 2015) |  |  |  | $ (74,947) | $ 0 |  |  |
Preferred stock value issued include for regulatory tier one capital calculations |  |  |  | $ 144,500 |  |  |  |
Preferred stock dividend rate percentage |  |  |  | 5.375% |  |  |  |
Trust preferred securities |  |  |  | $ 133,000 |  |  |  |
Corporation's aggregate subordinated notes |  |  |  | 137,115 |  | $ 137,115 |  |
Maximum dividends available without prior regulatory approval |  |  |  | $ 399,400 |  |  |  |
Maximum number of quarterly periods by which the corporation has the right to defer interest payments on junior subordinated deferrable interest debentures | quarter |  |  |  | 20 |  |  |  |
Two Thousand And Sixteen [Member] | Scenario, Forecast [Member] |  |  |  |  |  |  |  |
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items] |  |  |  |  |  |  |  |
Tier One Capital Conservation Buffer To Risk Weighted Assets Required Under Regulatory |  | 0.625% |  |  |  |  |  |
Tier One Risk Based Capital Conservation Buffer Initial Requirements Phasing Duration |  | 4 years |  |  |  |  |  |
Two Thousand And Nineteen [Member] | Scenario, Forecast [Member] |  |  |  |  |  |  |  |
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items] |  |  |  |  |  |  |  |
Minimum ratio of Tier 1 capital to risk-weighted assets |  |  |  |  |  |  | 6.00% |
Minimum ratio of Total capital to risk-weighted assets |  |  |  |  |  |  | 8.00% |
Common Equity Tier 1 Risk Based Capital To Risk Weighted Assets |  |  |  |  |  |  | 4.50% |
Capital Conservation Buffer |  |  |  |  |  |  | 2.50% |
Two Thousand And Nineteen [Member] | Scenario, Forecast [Member] | Minimum [Member] |  |  |  |  |  |  |  |
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items] |  |  |  |  |  |  |  |
Effective Tier 1 Capital Ratio, Upon Full Implementation |  |  |  |  |  |  | 8.50% |
Tier One Risk Based Capital to Risk Weighted Assets, Ratio Upon Full Implementation |  |  |  |  |  |  | 10.50% |
Minimum leverage ratio |  |  |  |  |  |  | 4.00% |
Effective Common Equity Tier One Capital To Risk Weighted Assets, Ratio Upon Full Implementation |  |  |  |  |  |  | 7.00% |
Trust Preferred Securities Tier One Allowable Portion [Member] |  |  |  |  |  |  |  |
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items] |  |  |  |  |  |  |  |
Trust preferred securities |  |  |  | $ 33,300 |  |  |  |
Trust Preferred Securities Tier Two Allowable Portion [Member] |  |  |  |  |  |  |  |
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items] |  |  |  |  |  |  |  |
Trust preferred securities |  |  |  | 99,800 |  |  |  |
Floating Rate Subordinated Notes [Member] |  |  |  |  |  |  |  |
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items] |  |  |  |  |  |  |  |
Corporation's aggregate subordinated notes |  |  |  | $ 100,000 |  |  |  |
Per Year Percentage decrease in permissible portion of subordinate note included in Total Capital |  |  |  | 20.00% |  |  |  |
Final years of the term of the notes |  |  |  | 5 years |  |  |  |
Debt Instrument, Maturity Date |  |  | Feb. 15, 2017 |  |  |  |  |
Permissible portion of subordinated note included in total capital |  |  |  | $ 20,000 |  | $ 40,000 |  |
Floating Rate Subordinated Notes [Member] | Two Thousand And Sixteen [Member] | Scenario, Forecast [Member] |  |  |  |  |  |  |  |
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items] |  |  |  |  |  |  |  |
Permissible portion of subordinated note included in total capital | $ 0 |  |  |  |  |  |  |
Cullen/Frost [Member] |  |  |  |  |  |  |  |
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items] |  |  |  |  |  |  |  |
Minimum ratio of Tier 1 capital to risk-weighted assets |  |  |  |  |  | 4.00% |  |
Minimum ratio of Total capital to risk-weighted assets |  |  |  | 13.96% |  | 14.55% |  |
Minimum leverage ratio |  |  |  | 7.91% |  | 8.16% |  |
Common Equity Tier 1 Risk Based Capital To Risk Weighted Assets |  |  |  | 4.50% |  |  |  |

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