Real Estate Owned - Additional Information (Details)	3 Months Ended				9 Months Ended
	Sep. 30, 2024 USD ($)	Jun. 30, 2024 USD ($)	Mar. 31, 2024 USD ($)	Sep. 30, 2023 USD ($)	Sep. 30, 2024 USD ($) real_estate_owned_asset	Sep. 30, 2023 USD ($)	Sep. 16, 2024 USD ($)	Jul. 02, 2024 USD ($)	Mar. 19, 2024 USD ($)	Dec. 31, 2023 USD ($)	Jun. 30, 2023 USD ($)	Mar. 31, 2023 USD ($)	Dec. 31, 2022 USD ($)
Real Estate [Line Items]
Number of real estate owned assets | real_estate_owned_asset					3
Total acquisition price					$ 159,900,000
Building and building improvements	$ 75,700,000				75,700,000
Land and land improvements	63,500,000				63,500,000
Acquired intangible assets	19,200,000				19,200,000
Other components	1,500,000				1,500,000
Real estate owned, net	138,725,000				138,725,000					$ 0
Principal balance	21,602,517,000				21,602,517,000					23,787,012,000
CECL reserve	1,011,059,000	$ 893,938,000	$ 751,370,000	$ 463,423,000	1,011,059,000	$ 463,423,000				$ 576,936,000	$ 363,875,000	$ 336,591,000	$ 326,137,000
Real estate owned, gross	139,341,000				139,341,000		$ 64,600,000	$ 33,600,000	$ 60,200,000
Amount charged off	16,989,000	$ 12,537,000	61,013,000		90,539,000
Revenue from real estate owned	1,214,000			0	1,214,000	0
Expenses from real estate owned	2,684,000			$ 0	3,647,000	$ 0
Depreciation and amortization expense	1,000,000.0				1,200,000
Other operating expense	1,700,000				$ 2,400,000
Commercial Real Estate
Real Estate [Line Items]
Principal balance							82,900,000		90,200,000
CECL reserve							$ 17,500,000		$ 29,100,000
Amount charged off	17,500,000		$ 29,100,000
Multifamily Property
Real Estate [Line Items]
Principal balance								33,000,000
CECL reserve								$ 0
Amount charged off	$ 0