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Capital and Regulatory Matters - Additional Information (Detail)
$ / shares in Units, $ in Thousands
 3 Months Ended 12 Months Ended
Jan. 29, 2025
USD ($)
Nov. 19, 2020
USD ($)
Mar. 31, 2025
USD ($)
quarter
$ / shares
shares
Mar. 31, 2024
USD ($)
shares
Dec. 31, 2024
USD ($)
$ / shares
shares
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]          
CECL Transition Amount         $ 15,400
Treasury Stock, Shares, Acquired | shares     18,427 18,193  
Purchase of treasury stock (289,149 shares QTD and 298,332 shares YTD in 2023 and 7,459 shares YTD in 2022)     $ 2,600 $ 2,073  
Maximum dividends available without prior regulatory approval     $ 742,700    
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
Preferred Stock, Aggregate Liquidation Preference, Value     $ 150,000    
Preferred stock, par value | $ / shares     $ 0.01   $ 0.01
Preferred Stock, Liquidation Preference Per Share | $ / shares     $ 1,000   $ 1,000
Number of Preferred Stock equivalent depositary shares | shares     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    
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
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
prior stock repurchase plans | Treasury Stock, Common          
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]          
Treasury Stock, Shares, Acquired | shares     0    
stock repurchase 2025 plan          
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]          
Share Repurchase Program, Authorized, Amount $ 150,000        
Share Repurchase Program, Period in Force 1 year        
stock repurchase 2025 plan | Treasury Stock, Common          
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]          
Treasury Stock, Shares, Acquired | shares     0    
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     $ 20,000   $ 40,000