Shareholders' Equity - Issued and Outstanding Preferred Stock (Detail) - USD ($) $ in Thousands	Jun. 30, 2022	Dec. 31, 2021
Class of Stock [Line Items]
Preferred stock, shares issued	10,000,000
Carrying Value	$ 2,010,600	$ 1,750,000
Series E Fixed-To-Floating Rate Non-Cumulative Perpetual Preferred Stock [Member]
Class of Stock [Line Items]
Preferred stock, shares issued	350,000	350,000
Preferred stock, Shares Outstanding		350,000
Carrying Value	$ 350,000	$ 350,000
Series F Fixed-to-Floating Rate Non-Cumulative Perpetual Preferred Stock [Member]
Class of Stock [Line Items]
Preferred stock, shares issued	50,000	50,000
Preferred stock, Shares Outstanding	50,000	50,000
Carrying Value	$ 500,000	$ 500,000
Series G Fixed-Rate Reset Non-Cumulative Perpetual Preferred Stock [Member]
Class of Stock [Line Items]
Preferred stock, shares issued	40,000	40,000
Preferred stock, Shares Outstanding	40,000	40,000
Carrying Value	$ 400,000	$ 400,000
Series H Fixed-to-Floating Rate Non-cumulative Perpetual Preferred Stock [Member]
Class of Stock [Line Items]
Preferred stock, shares issued	10,000,000
Preferred stock, Shares Outstanding	10,000,000
Carrying Value	$ 260,600
Series I Fixed-Rate Reset Non-Cumulative Perpetual Preferred Stock [Member]
Class of Stock [Line Items]
Preferred stock, shares issued	50,000	50,000
Preferred stock, Shares Outstanding	50,000	50,000
Carrying Value	$ 500,000	$ 500,000