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Loans Held-for-Sale, Net - Narrative (Details)	3 Months Ended				9 Months Ended		12 Months Ended
	Sep. 30, 2023 USD ($)	Mar. 31, 2023 USD ($)	Sep. 30, 2022 USD ($)	Jun. 30, 2022 USD ($)	Sep. 30, 2023 USD ($)	Sep. 30, 2022 USD ($)	Dec. 31, 2022 USD ($) loan
Loans Held-for-Sale, Net
Sale of loans held-for-sale excluding acquired loans	$ 1,280,000,000		$ 1,080,000,000.00		$ 3,620,000,000	$ 3,700,000,000
Amount of securitizations							$ 43,400,000
Unrealized impairment loss				$ 4,100,000	2,891,000
Loans held-for-sale placed on non-accrual status	0				0		0
Greater Than 90 Days Past Due
Loans Held-for-Sale, Net
Loans held-for-sale that were 90 days or more past due	$ 0				$ 0		0
US Government Sponsored-Enterprise Insured Loans
Loans Held-for-Sale, Net
Period of loans held for sale sold					60 days
Private Label
Loans Held-for-Sale, Net
Period of loans held for sale sold					180 days
Sale of loans held-for-sale excluding acquired loans							489,300,000
Net loss of swaps gain with loans							$ 5,200,000
Number of loans under the loan portfolio | loan							7
Unpaid principal balance							$ 129,900,000
Net loans carrying value							$ 116,400,000
Gain on sale of loans		$ 900,000

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Amount of securitization from loan receivable held-for-sale.

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The amount of net loss of swaps gain with loans.

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Represents the number of loans related to the real estate property under the loan portfolio.

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Maximum period from the origination date a loan receivables held-for-sale will be sold.

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The cash inflow resulting from the sale of loans excluding loans acquired which are classified as held-for-sale, including proceeds from loans sold through mortgage securitization.

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Amortized cost excluding accrued interest, of financing receivable on nonaccrual status. Excludes net investment in lease.

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 326
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 16
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147479319/326-20-50-16

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 860
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 5
-Publisher FASB
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