Unaudited Pro Forma Interest Net Earnings (Details) - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Business Acquisition, Pro Forma Information, Nonrecurring Adjustment [Line Items]
Net interest income		$ 747,128	$ 1,290,762	$ 1,103,824
Total noninterest income		(448,285)	74,827	$ 193,927
Pro Forma
Business Acquisition, Pro Forma Information, Nonrecurring Adjustment [Line Items]
Net interest income		1,123,413	1,698,670
Total noninterest income		(525,455)	92,177
Income (Loss) Attributable to Parent, before Tax	[1]	(2,031,704)	$ 600,322
Acquisition Costs, Period Cost		$ 164,200

[1] The 2023 pro forma net loss was adjusted to exclude $164.2 million of merger-related costs, inclusive of historical BANC merger-related costs, incurred in 2023 and the pro forma income for 2022 was adjusted to include these costs.