Condensed Parent Company Information (Condensed Statements of Cash Flows) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Net cash provided by operating activities	$ 585,690	$ 355,191	$ 351,949
Other, net	42,267	7,071	(30,446)
Net cash used in investing activities	(3,224,584)	(3,177,472)	(459,022)
Proceeds from issuance of long term debt	22,388	166,425	20,846
Repayment of long term debt	(153,444)	(308)	(14,222)
Dividends paid to stockholders	(95,927)	(95,605)	(94,871)
Other repurchases of common stock	(21,796)	(12,716)
Proceeds from dividend reinvestment and other incentive plans	3,872	4,164	3,614
Payroll tax remitted on net share settlement of equity awards	(7,364)	(4,530)	(6,295)
Cash received(paid) under accelerated share repurchase agreement		(12,110)	185,000
Net cash provided by financing activities	2,513,789	2,916,483	155,805
NET INCREASE (DECREASE) IN CASH AND DUE FROM BANKS	(125,105)	94,202	48,732
CASH AND DUE FROM BANKS, BEGINNING	526,306	432,104	383,372
CASH AND DUE FROM BANKS, ENDING	401,201	526,306	432,104
Hancock Whitney Corporation [Member]
Cash flows from operating activities - principally dividends received from subsidiaries	160,887	71,067	255,322
Net cash provided by operating activities	160,887	71,067	255,322
Contribution of capital to subsidiary			(50,000)
Net cash received in acquisition			38,505
Other, net			(1,874)
Net cash used in investing activities			(13,369)
Proceeds from issuance of long term debt		166,425
Repayment of long term debt	(150,000)		(13,919)
Dividends paid to stockholders	(95,927)	(95,605)	(94,871)
Other repurchases of common stock	(21,796)	(12,716)
Proceeds from dividend reinvestment and other incentive plans	4,482	5,301	4,265
Payroll tax remitted on net share settlement of equity awards	(7,364)	(4,530)	(6,295)
Cash received(paid) under accelerated share repurchase agreement		12,110	(185,000)
Other, net			(42,129)
Net cash provided by financing activities	(270,605)	70,985	(337,949)
NET INCREASE (DECREASE) IN CASH AND DUE FROM BANKS	(109,718)	142,052	(95,996)
CASH AND DUE FROM BANKS, BEGINNING	199,995	57,943	153,939
CASH AND DUE FROM BANKS, ENDING	$ 90,277	$ 199,995	$ 57,943