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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
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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 |  |

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