Shareholders' Equity and Other Comprehensive Income - Changes in Shares by Class (Details) - shares	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Balance, common stock, shares outstanding (in shares)	148,039,495
Stock options exercised (in shares)	923,000	572,000	820,000
Balance, common stock, shares outstanding (in shares)	145,010,086	148,039,495
Preferred Shares Issued
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Balance (in shares)	22,000,000	22,000,000	8,000,000
Issuance of preferred stock (in shares)			14,000,000
Balance (in shares)	22,000,000	22,000,000	22,000,000
Preferred Shares Issued | Series D Preferred Stock
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Balance (in shares)	8,000,000	8,000,000	8,000,000
Issuance of preferred stock (in shares)			0
Balance (in shares)	8,000,000	8,000,000	8,000,000
Preferred Shares Issued | Series E Preferred Stock
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Balance (in shares)	14,000,000	14,000,000	0
Issuance of preferred stock (in shares)			14,000,000
Balance (in shares)	14,000,000	14,000,000	14,000,000
Common Stock
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Balance (in shares)	168,133,000	166,801,000	143,300,000
Balance, common stock, shares outstanding (in shares)	148,040,000	147,158,000	115,866,000
Issuance of common stock (in shares)	125,000	379,000	344,000
Warrants exercised and common stock reissued (in shares)	3,000		260,000
Restricted share unit activity (in shares)	355,000	389,000	302,000
Stock options exercised (in shares)	896,000	564,000	812,000
Repurchase of common stock (in shares)	4,400,000	450,000	19,900,000
Repurchase of stock (in shares)	(4,409,000)	(450,000)	(19,903,000)
Balance (in shares)	169,384,000	168,133,000	166,801,000
Balance, common stock, shares outstanding (in shares)	145,010,000	148,040,000	147,158,000
Common Stock | FCB Financial Holdings, Inc.
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of common stock (in shares)			22,043,000
Common stock reissued (in shares)			(27,434,000)
Treasury Stock
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Balance (in shares)	20,093,000	19,643,000	27,434,000
Issuance of common stock (in shares)	(125,000)
Warrants exercised and common stock reissued (in shares)	(3,000)		(260,000)
Repurchase of common stock (in shares)	4,409,000	450,000	19,903,000
Balance (in shares)	24,374,000	20,093,000	19,643,000
Treasury Stock | FCB Financial Holdings, Inc.
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Common stock reissued (in shares)			(27,434,000)