Shareholders' Equity (Details) - USD ($) $ / shares in Units, $ in Millions			3 Months Ended
	Aug. 20, 2021	Jul. 22, 2021	Mar. 31, 2022	Mar. 31, 2021	Dec. 31, 2021
Business Acquisition Equity Interests Issued Or Issuable [Line Items]
Number of shares authorized to be repurchased			10,800,000
Purchase of treasury stock				$ 12.7
Treasury stock acquired, Shares,				200,000
Treasury Stock Acquired, Average Cost Per Share			$ 61.91
Preferred stock, par value			$ 1.00	$ 1.00	$ 1
Non-cumulative Perpetual Series D Preferred Stock [Member]
Business Acquisition Equity Interests Issued Or Issuable [Line Items]
Stock Dividend		4.50%
Preferred stock, par value		$ 1.00
Preferred stock liquidation preference per depositary share		25
Preferred stock, liquidation preference per share		$ 25,000
Preferred stock, redemption terms			The Company may redeem the Series D preferred stock at its option, subject to regulatory approval, on or after August 15, 2026.
Underwritten registered public offering		$ 300.0
Non-cumulative Perpetual Series A Preferred Stock [Member]
Business Acquisition Equity Interests Issued Or Issuable [Line Items]
Stock Dividend	6.25%
Preferred stock redemption price per depositary share	$ 25.00
Business Bancshares, Inc. [Member]
Business Acquisition Equity Interests Issued Or Issuable [Line Items]
Issuance of common stock			2,100,000