Stockholders' Equity Narrative (Details)			12 Months Ended
	Nov. 30, 2023 USD ($) shares	Jun. 06, 2022 USD ($) $ / shares shares	Dec. 31, 2023 USD ($) $ / shares shares	Dec. 31, 2022 USD ($) $ / shares shares	Dec. 31, 2021 USD ($) $ / shares shares	Apr. 30, 2021 USD ($)	Dec. 31, 2020 USD ($)
Class of Stock [Line Items]
Total stockholders' equity | $			$ 3,390,765,000	$ 3,950,531,000	$ 3,999,630,000		$ 3,594,951,000
Net Income (Loss) Available to Common Stockholders, Diluted | $			1,938,925,000	(404,274,000)	(606,959,000)
Net Income (Loss) Available to Common Stockholders, Basic | $			1,938,925,000	(404,274,000)	(606,959,000)
Common Shares Surrendered | $			$ 5,421,000	$ 9,531,000	$ 8,505,000
Common Stock, Shares, Acquired			228,151	169,152	130,735
Common Stock Acquired, Average Cost Per Share | $ / shares			$ 23.76	$ 56.35	$ 65.06
Preferred Stock, Shares Issued		20,530,000	513,250	513,250
Preferred Stock, Par or Stated Value Per Share | $ / shares			$ 0.01	$ 0.01
Preferred Stock Depository Share | $			$ 25.00
Preferred Stock, Liquidation Preference Per Share | $ / shares		$ 1,000
Payments of Stock Issuance Costs | $		$ 14,700,000
Stock Issued During Period, Value, New Issues | $		$ 498,500,000
Preferred Stock, Ownership Interest, Percentage		0.025
Subordinated debt | $			936,600,000
Stockholders' Equity, Period Increase (Decrease) | $			(559,800,000)
Net (loss) earnings | $			(1,899,137,000)	$ 423,613,000	$ 606,959,000
Adjustments to Additional Paid in Capital, Other | $			$ 358,800,000
Preferred Stock, Shares Outstanding			513,250	513,250
Common Stock, Shares, Issued, Acquisitions			157,651,752	78,973,869
Common Stock, Shares, Outstanding			156,790,349	77,393,448
Preferred Stock, Shares Authorized	50,000,000
Class of Warrant or Right, Exercise Price of Warrants or Rights | $ / shares			$ 24.60
Centerbridge Investor
Class of Stock [Line Items]
Common Stock, Warrants Issued	3,000,000
Common Stock, Warrants Issued, Per Share Price | $	$ 15.375
BANC
Class of Stock [Line Items]
Common Stock, Shares, Outstanding			156,790,349
Common Stock, Shares Authorized			446,863,844
April 30, 2021 Issuance
Class of Stock [Line Items]
Subordinated debt | $						$ 400,000,000
Preferred Class A
Class of Stock [Line Items]
Investment Interest Rate		7.75%
Preferred Class A | Pacific Western Bank
Class of Stock [Line Items]
Investment Interest Rate		7.75%
Class B Non-Voting
Class of Stock [Line Items]
Common Stock, Shares, Issued, Acquisitions			477,321	0
Common Stock, Shares, Outstanding			477,321
Common Stock, Shares Authorized			3,136,156
NVCE Non-voting Share Class
Class of Stock [Line Items]
Common Stock, Shares, Outstanding			10,829,990
Preferred Stock, Shares Authorized	27,000,000
NVCE Non-voting Share Class | Warburg Investors
Class of Stock [Line Items]
Common Stock, Shares, Issued, Acquisitions	15,853,659
NVCE Non-voting Share Class | Centerbridge Investor
Class of Stock [Line Items]
Common Stock, Shares, Issued, Acquisitions	3,040,780