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Stockholders' Equity (Compliance with Regulatory Capital Requirements) (Details)
$ in Thousands
Dec. 31, 2020
USD ($)
Dec. 31, 2019
USD ($)
Dec. 31, 2018
Tier 1 leverage capital, Actual, Amount $ 2,534,049 $ 2,584,162  
Common equity tier 1 (to risk weighted assets), Actual, Amount 2,534,049 2,584,162  
Tier 1 capital (to risk weighted assets), Actual, Amount 2,534,049 2,584,162  
Total capital (to risk weighted assets), Actual, Amount $ 3,155,692 $ 2,929,387  
Tier 1 leverage capital, Actual, Ratio % 7.88 8.76  
Common equity tier 1 (to risk weighted assets), Actual, Ratio % 10.61% 10.50%  
Tier 1 capital (to risk weighted assets), Actual, Ratio % 10.61 10.50  
Total capital (to risk weighted assets), Actual, Ratio % 13.22 11.90  
Tier 1 leverage capital, Required for Minimum Capital Adequacy, Amount $ 1,287,103 $ 1,180,163  
Common equity tier 1 (to risk weighted assets), Required for Minimum Capital Adequacy, Amount 1,074,272 1,107,527  
Tier 1 capital (to risk weighted assets), Required for Minimum Capital Adequacy, Amount 1,432,362 1,476,702  
Total capital (to risk weighted assets), Required for Minimum Capital Adequacy, Amount $ 1,909,817 $ 1,968,936  
Tier 1 leverage capital, Required for Minimum Capital Adequacy, Ratio % 4.00 4.00 0.040
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 % 6.00 6.00 0.060
Total capital (to risk weighted assets), Required for Minimum Capital Adequacy, Ratio % 8.00 8.00 0.080
Tier 1 leverage capital, Required To Be Well Capitalized, Amount $ 1,608,878 $ 1,475,204  
Common equity tier 1 (to risk weighted assets), Required To Be Well Capitalized, Amount 1,551,726 1,599,761  
Tier 1 capital (to risk weighted assets), Required To Be Well Capitalized, Amount 1,909,817 1,968,936  
Total capital (to risk weighted assets), Required To Be Well Capitalized, Amount $ 2,387,271 $ 2,461,171  
Tier 1 leverage capital, Required To Be Well Capitalized, Ratio % 5.00 5.00 5.0
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 % 8.00 8.00 8.0
Total capital (to risk weighted assets), Required To Be Well Capitalized, Ratio % 10.00 10.00 10.0
Hancock Whitney Bank [Member]      
Tier 1 leverage capital, Actual, Amount $ 2,607,215 $ 2,640,913  
Common equity tier 1 (to risk weighted assets), Actual, Amount 2,607,215 2,640,913  
Tier 1 capital (to risk weighted assets), Actual, Amount 2,607,215 2,640,913  
Total capital (to risk weighted assets), Actual, Amount $ 2,905,988 $ 2,836,138  
Tier 1 leverage capital, Actual, Ratio % 8.11 8.96  
Common equity tier 1 (to risk weighted assets), Actual, Ratio % 10.94% 10.74%  
Tier 1 capital (to risk weighted assets), Actual, Ratio % 10.94 10.74  
Total capital (to risk weighted assets), Actual, Ratio % 12.19 11.53  
Tier 1 leverage capital, Required for Minimum Capital Adequacy, Amount $ 1,286,059 $ 1,179,194  
Common equity tier 1 (to risk weighted assets), Required for Minimum Capital Adequacy, Amount 1,072,924 1,106,558  
Tier 1 capital (to risk weighted assets), Required for Minimum Capital Adequacy, Amount 1,430,565 1,475,411  
Total capital (to risk weighted assets), Required for Minimum Capital Adequacy, Amount $ 1,907,420 $ 1,967,214  
Tier 1 leverage capital, Required for Minimum Capital Adequacy, Ratio % 4.00 4.00  
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 % 6.00 6.00  
Total capital (to risk weighted assets), Required for Minimum Capital Adequacy, Ratio % 8.00 8.00  
Tier 1 leverage capital, Required To Be Well Capitalized, Amount $ 1,607,573 $ 1,473,992  
Common equity tier 1 (to risk weighted assets), Required To Be Well Capitalized, Amount 1,549,778 1,598,362  
Tier 1 capital (to risk weighted assets), Required To Be Well Capitalized, Amount 1,907,420 1,967,214  
Total capital (to risk weighted assets), Required To Be Well Capitalized, Amount $ 2,384,275 $ 2,459,018  
Tier 1 leverage capital, Required To Be Well Capitalized, Ratio % 5.00 5.00  
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 % 8.00 8.00  
Total capital (to risk weighted assets), Required To Be Well Capitalized, Ratio % 10.00 10.00