Basis of Presentation (Details)	12 Months Ended
	Dec. 31, 2019	Jun. 30, 2019 $ / shares	Dec. 31, 2018 $ / shares
Business Acquisition [Line Items]
Common stock, par value (in dollars per share)		$ 0.10	$ 0.10
Hancock Whitney Corporation
Business Acquisition [Line Items]
Common stock, par value (in dollars per share)		$ 3.33
Scenario, Forecast | Hancock Whitney Corporation | Hancock Whitney Corporation
Business Acquisition [Line Items]
Number of shares issued for each share of acquiree common stock (in shares)	0.2952