Condensed Parent Company Information (Condensed Balance Sheets) (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Securities available for sale	$ 2,691,037	$ 2,910,869
Total assets	28,235,907	27,336,086
Long-term debt	224,993	305,513
Other liabilities	177,994	179,852
Stockholders' equity	3,081,340	2,884,949	$ 2,719,768	$ 2,413,143
Total liabilities and stockholders' equity	28,235,907	27,336,086
Hancock Whitney Corporation [Member]
Cash	153,939	71,328
Securities available for sale		58,521
Investment in bank subsidiaries	3,040,186	2,953,032
Investment in non-bank subsidiaries	26,274	22,670
Due from subsidiaries and other assets	6,868	14,010
Total assets	3,227,267	3,119,561
Long-term debt	145,396	234,135
Other liabilities	531	477
Stockholders' equity	3,081,340	2,884,949
Total liabilities and stockholders' equity	$ 3,227,267	$ 3,119,561