Condensed Parent Company Information (Condensed Balance Sheets) (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Total assets	$ 30,600,757	$ 28,235,907
Long term debt	233,462	224,993
Other liabilities	205,539	177,994
Stockholders' equity	3,467,685	3,081,340	$ 2,884,949	$ 2,719,768
Total liabilities and stockholders' equity	30,600,757	28,235,907
Hancock Whitney Corporation [Member]
Cash	57,943	153,939
Investment in bank subsidiaries	3,524,029	3,040,186
Investment in non-bank subsidiaries	23,498	26,274
Due from subsidiaries and other assets	9,101	6,868
Total assets	3,614,571	3,227,267
Long term debt	145,572	145,396
Other liabilities	1,314	531
Stockholders' equity	3,467,685	3,081,340
Total liabilities and stockholders' equity	$ 3,614,571	$ 3,227,267