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Capital and Regulatory Matters - Additional Information (Detail) $ / shares in Units, $ in Thousands |  |  | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | --- | --- | ---
Jan. 24, 2024 USD ($) | Nov. 19, 2020 USD ($) | Sep. 30, 2024 USD ($) $ / shares shares | Sep. 30, 2023 USD ($) shares | Sep. 30, 2024 USD ($) quarter $ / shares shares | Sep. 30, 2023 USD ($) shares | Dec. 31, 2023 USD ($) $ / shares shares
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items] |  |  |  |  |  |  |
CECL Transition Amount |  |  | $ 15,400 |  | $ 15,400 |  | $ 30,800
Treasury Stock, Shares, Acquired | shares |  |  | 188,889 | 111,956 | 508,176 | 410,288 |
Purchase of treasury stock (289,149 shares QTD and 298,332 shares YTD in 2023 and 7,459 shares YTD in 2022) |  |  | $ 20,047 | $ 11,372 | $ 52,273 | $ 40,496 |
Maximum dividends available without prior regulatory approval |  |  | $ 1,100,000 |  | $ 1,100,000 |  |
Maximum number of quarterly periods by which the corporation has the right to defer interest payments on junior subordinated deferrable interest debentures | quarter |  |  |  |  | 20 |  |
Series B Preferred Stock [Member] |  |  |  |  |  |  |
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items] |  |  |  |  |  |  |
Preferred stock, shares issued | shares |  |  | 150,000 |  | 150,000 |  | 150,000
Preferred Stock, Aggregate Liquidation Preference, Value |  |  | $ 150,000 |  | $ 150,000 |  |
Preferred stock, par value | $ / shares |  |  | $ 0.01 |  | $ 0.01 |  | $ 0.01
Preferred Stock, Liquidation Preference Per Share | $ / shares |  |  | $ 1,000 |  | $ 1,000 |  | $ 1,000
Number of Preferred Stock equivalent depositary shares | shares |  |  | 40 |  | 40 |  |
Payments of Stock Issuance Costs |  | $ 4,500 |  |  |  |  |
Proceeds from Issuance of Preferred Stock and Preference Stock |  | $ 145,500 |  |  |  |  |
Series B Preferred Stock Equivalent Depositary Shares Member |  |  |  |  |  |  |
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items] |  |  |  |  |  |  |
Preferred Stock, Liquidation Preference Per Share | $ / shares |  |  | $ 25 |  | $ 25 |  |
Cullen/Frost [Member] |  |  |  |  |  |  |
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items] |  |  |  |  |  |  |
Additional Tier 1 Capital beyond Common Equity Tier 1 |  |  | $ 145,500 |  | $ 145,500 |  | $ 145,500
Preferred stock dividend rate percentage |  |  |  |  | 4.45% |  | 4.45%
Cullen/Frost [Member] | Trust Preferred Securities Tier Two Capital Allowable Portion [Member] |  |  |  |  |  |  |
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items] |  |  |  |  |  |  |
Trust preferred securities |  |  |  |  | $ 120,000 |  | $ 120,000
Frost Bank [Member] |  |  |  |  |  |  |
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items] |  |  |  |  |  |  |
Additional Tier 1 Capital beyond Common Equity Tier 1 |  |  | 0 |  | $ 0 |  | $ 0
prior stock repurchase plans | Treasury Stock, Common |  |  |  |  |  |  |
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items] |  |  |  |  |  |  |
Treasury Stock, Shares, Acquired | shares |  |  |  |  |  |  | 400,868
Purchase of treasury stock (289,149 shares QTD and 298,332 shares YTD in 2023 and 7,459 shares YTD in 2022) |  |  |  |  |  |  | $ 39,000
stock repurchase 2024 plan |  |  |  |  |  |  |
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items] |  |  |  |  |  |  |
Stock Repurchase Program, Authorized Amount | $ 150,000 |  |  |  |  |  |
Stock Repurchase Program, Period in Force | 1 year |  |  |  |  |  |
stock repurchase 2024 plan | Treasury Stock, Common |  |  |  |  |  |  |
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items] |  |  |  |  |  |  |
Treasury Stock, Shares, Acquired | shares |  |  |  |  | 489,862 |  |
Purchase of treasury stock (289,149 shares QTD and 298,332 shares YTD in 2023 and 7,459 shares YTD in 2022) |  |  |  |  | $ 50,000 |  |
Subordinated Debt [Member] |  |  |  |  |  |  |
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items] |  |  |  |  |  |  |
Permissible Percentage Decreased Each Of Final Five Years Of Term Of Notes |  |  |  |  | 20.00% |  | 20.00%
Final years of the term of the notes |  |  |  |  | 5 years |  | 5 years
Subordinated Debt [Member] | Cullen/Frost [Member] |  |  |  |  |  |  |
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items] |  |  |  |  |  |  |
Permissible portion of subordinated note included in capital |  |  | $ 40,000 |  | $ 40,000 |  | $ 60,000

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