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Stockholders' Equity (Compliance with Regulatory Capital Requirements) (Details)
$ in Thousands
Dec. 31, 2025
USD ($)
Dec. 31, 2024
USD ($)
Dec. 31, 2018
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]      
Tier 1 leverage capital, Actual, Amount $ 3,872,490 $ 3,886,926  
Common equity tier 1 (to risk weighted assets), Actual, Amount 3,872,490 3,886,926  
Tier 1 capital (to risk weighted assets), Actual, Amount 3,872,490 3,886,926  
Total capital (to risk weighted assets), Actual, Amount $ 4,383,948 $ 4,378,748  
Tier 1 leverage capital, Actual, Ratio % 0.1117 0.1129  
Common equity tier 1 (to risk weighted assets), Actual, Ratio % 13.65% 14.14%  
Tier 1 capital (to risk weighted assets), Actual, Ratio % 0.1365 0.1414  
Total capital (to risk weighted assets), Actual, Ratio % 0.1545 0.1593  
Tier 1 leverage capital, Required for Minimum Capital Adequacy, Amount $ 1,386,435 $ 1,377,216  
Common equity tier 1 (to risk weighted assets), Required for Minimum Capital Adequacy, Amount 1,276,984 1,237,066  
Tier 1 capital (to risk weighted assets), Required for Minimum Capital Adequacy, Amount 1,702,645 1,649,421  
Total capital (to risk weighted assets), Required for Minimum Capital Adequacy, Amount $ 2,270,193 $ 2,199,228  
Tier 1 leverage capital, Required for Minimum Capital Adequacy, Ratio % 0.04 0.04 0.04
Common equity tier 1 (to risk weighted assets), Required for Minimum Capital Adequacy, Ratio % 4.50% 4.50% 4.50%
Tier 1 capital (to risk weighted assets), Required for Minimum Capital Adequacy, Ratio % 0.06 0.06 0.06
Total capital (to risk weighted assets), Required for Minimum Capital Adequacy, Ratio % 0.08 0.08 0.08
Tier 1 leverage capital, Required To Be Well Capitalized, Amount $ 1,733,044 $ 1,721,520  
Common equity tier 1 (to risk weighted assets), Required To Be Well Capitalized, Amount 1,844,532 1,786,873  
Tier 1 capital (to risk weighted assets), Required To Be Well Capitalized, Amount 2,270,193 2,199,228  
Total capital (to risk weighted assets), Required To Be Well Capitalized, Amount $ 2,837,741 $ 2,749,036  
Tier 1 leverage capital, Required To Be Well Capitalized, Ratio % 0.05 0.05 0.05
Common equity tier 1 (to risk weighted assets), Required To Be Well Capitalized, Ratio % 6.50% 6.50% 6.50%
Tier 1 capital (to risk weighted assets), Required To Be Well Capitalized, Ratio % 0.08 0.08 0.08
Total capital (to risk weighted assets), Required To Be Well Capitalized, Ratio % 0.10 0.10 0.10
Hancock Whitney Bank [Member]      
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]      
Tier 1 leverage capital, Actual, Amount $ 3,753,825 $ 3,754,217  
Common equity tier 1 (to risk weighted assets), Actual, Amount 3,753,825 3,754,217  
Tier 1 capital (to risk weighted assets), Actual, Amount 3,753,825 3,754,217  
Total capital (to risk weighted assets), Actual, Amount $ 4,092,783 $ 4,073,539  
Tier 1 leverage capital, Actual, Ratio % 0.1084 0.1091  
Common equity tier 1 (to risk weighted assets), Actual, Ratio % 13.24% 13.67%  
Tier 1 capital (to risk weighted assets), Actual, Ratio % 0.1324 0.1367  
Total capital (to risk weighted assets), Actual, Ratio % 0.1443 0.1483  
Tier 1 leverage capital, Required for Minimum Capital Adequacy, Amount $ 1,385,477 $ 1,376,113  
Common equity tier 1 (to risk weighted assets), Required for Minimum Capital Adequacy, Amount 1,275,931 1,235,956  
Tier 1 capital (to risk weighted assets), Required for Minimum Capital Adequacy, Amount 1,701,241 1,647,942  
Total capital (to risk weighted assets), Required for Minimum Capital Adequacy, Amount $ 2,268,322 $ 2,197,256  
Tier 1 leverage capital, Required for Minimum Capital Adequacy, Ratio % 0.04 0.04  
Common equity tier 1 (to risk weighted assets), Required for Minimum Capital Adequacy, Ratio % 4.50% 4.50%  
Tier 1 capital (to risk weighted assets), Required for Minimum Capital Adequacy, Ratio % 0.06 0.06  
Total capital (to risk weighted assets), Required for Minimum Capital Adequacy, Ratio % 0.08 0.08  
Tier 1 leverage capital, Required To Be Well Capitalized, Amount $ 1,731,847 $ 1,720,142  
Common equity tier 1 (to risk weighted assets), Required To Be Well Capitalized, Amount 1,843,011 1,785,270  
Tier 1 capital (to risk weighted assets), Required To Be Well Capitalized, Amount 2,268,322 2,197,256  
Total capital (to risk weighted assets), Required To Be Well Capitalized, Amount $ 2,835,402 $ 2,746,570  
Tier 1 leverage capital, Required To Be Well Capitalized, Ratio % 0.05 0.05  
Common equity tier 1 (to risk weighted assets), Required To Be Well Capitalized, Ratio % 6.50% 6.50%  
Tier 1 capital (to risk weighted assets), Required To Be Well Capitalized, Ratio % 0.08 0.08  
Total capital (to risk weighted assets), Required To Be Well Capitalized, Ratio % 0.10