CONSOLIDATED STATEMENTS OF CHANGES IN SHAREHOLDERS' EQUITY (unaudited) - USD ($) $ in Thousands		Total	FCB Financial Holdings, Inc.	Preferred Stock	Common Stock [Member]	Common Stock [Member] FCB Financial Holdings, Inc.	Additional Paid-in Capital	Additional Paid-in Capital FCB Financial Holdings, Inc.	Treasury Stock	Treasury Stock FCB Financial Holdings, Inc.	Accumulated Other Comprehensive Income (Loss)	Retained Earnings	Retained Earnings FCB Financial Holdings, Inc.
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Adoption of ASU | ASU 2016-02		$ 4,270										$ 4,270
Balance at Dec. 31, 2018		3,133,602		$ 195,140	$ 143,300		$ 3,060,561		$ (1,014,746)		$ (94,420)	843,767
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income		120,186										120,186
Other comprehensive income, net of income taxes		76,078									76,078
Issuance of common stock, net of issuance costs			$ 704,756			$ 22,043		$ 682,713
Common stock reissued			877,570							$ 1,014,746			$ (137,176)
Fair value of exchanged equity awards and warrants attributed to purchase price			$ 43,362					$ 43,362
Cash dividends declared on common stock		(47,235)										(47,235)
Cash dividends declared on preferred stock	[1]	(3,150)										(3,150)
Repurchases of stock including costs to repurchase		(320,167)							(320,167)
Restricted share unit vesting and taxes paid related to net share settlement		(8,412)			235		(8,647)
Stock options exercised		6,649			351		6,029		269
Share-based compensation expense		10,244					10,244
Balance at Mar. 31, 2019		4,597,753		195,140	165,929		3,794,262		(319,898)		(18,342)	780,662
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Adoption of ASU | ASU 2016-13	[2]	(35,721)										(35,721)
Balance at Dec. 31, 2019		4,941,690		537,145	166,801		3,819,336		(715,560)		65,641	1,068,327
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income		38,521										38,521
Other comprehensive income, net of income taxes		191,270									191,270
Cash dividends declared on common stock		(48,598)										(48,598)
Cash dividends declared on preferred stock	[1]	(8,291)										(8,291)
Repurchases of stock including costs to repurchase		(16,246)							(16,246)
Restricted share unit vesting and taxes paid related to net share settlement		(7,257)			345		(7,602)
Stock options exercised		6,267			214		6,053
Share-based compensation expense		3,570					3,570
Balance at Mar. 31, 2020		$ 5,065,205		$ 537,145	$ 167,360		$ 3,821,357		$ (731,806)		$ 256,911	$ 1,014,238

[1] For the three months ended March 31, 2020, dividends per share were $0.39 and $0.37 for Series D and Series E Preferred Stock, respectively. For the three months ended March 31, 2019, dividends per share were $0.39 for Series D Preferred Stock.

[2] For additional information, see "Part I - Item 1. Financial Statements and Supplementary Data - Note 1 - Basis of Presentation" in this Report.