Business Combinations (Details Textual) - USD ($)			12 Months Ended
		Nov. 30, 2023	Dec. 31, 2023	Dec. 31, 2022	Jun. 06, 2022	Apr. 30, 2021
Business Acquisition [Line Items]
Subordinated debt			$ 936,600,000
Class of Warrant or Right, Exercise Price of Warrants or Rights			$ 24.60
Goodwill, Transfers			$ 198,627,000
Principal of PCD Loans Acquired			1,713,572,000
Loans and leases, net	[1]		25,208,000,000	$ 28,408,397,000
Pacific Western Bank
Business Acquisition [Line Items]
Shares, Outstanding		120,000,000
Banc of California
Business Acquisition [Line Items]
Shares, Outstanding		57,000,000
Private Capital | Nonvoting Common Stock
Business Acquisition [Line Items]
Stock Issued During Period, Shares, Acquisitions		10,800,000
Sale of Stock, Price Per Share		$ 12.30
Centerbridge Investor
Business Acquisition [Line Items]
Common Stock, Warrants Issued		3,000,000
Common Stock, Warrants Issued, Per Share Price		$ 15.375
Warburg Investors
Business Acquisition [Line Items]
Common Stock, Warrants Issued		15,900,000
April 30, 2021 Issuance
Business Acquisition [Line Items]
Subordinated debt						$ 400,000,000
Common Stock | Private Capital
Business Acquisition [Line Items]
Stock Issued During Period, Shares, Acquisitions		21,700,000
Preferred Class A
Business Acquisition [Line Items]
Investment Interest Rate					7.75%
Pacific Western Bank
Business Acquisition [Line Items]
Stock Issued During Period, Shares, Acquisitions		0.6569
Loans and leases, net			$ 3,965,112,000
Pacific Western Bank | Preferred Class A
Business Acquisition [Line Items]
Investment Interest Rate					7.75%
BANC
Business Acquisition [Line Items]
Common Stock, Voting Rights		66
BANC | Common Stock
Business Acquisition [Line Items]
Stock Issued During Period, Shares, Acquisitions		111,300,000

[1] Excludes accrued interest receivable of $111.3 million and $124.3 million at December 31, 2023 and 2022, which is recorded in "Other assets" on the consolidated balance sheets.