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Loans Held-for-Sale - Narrative (Details)	3 Months Ended			9 Months Ended		12 Months Ended
	Sep. 30, 2024 USD ($)	Sep. 30, 2023 USD ($)	Mar. 31, 2023 USD ($)	Sep. 30, 2024 USD ($)	Sep. 30, 2023 USD ($)	Dec. 31, 2022 USD ($) loan	Dec. 31, 2023 USD ($)
Loans Held-for-Sale, Net
Sale of loans held-for-sale excluding acquired loans	$ 1,120,000,000	$ 1,280,000,000		$ 3,340,000,000	$ 3,620,000,000
Loans held-for-sale placed on non-accrual status	0			0			$ 0
Financial Asset, Equal to or Greater than 90 Days Past Due [Member]
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
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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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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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 310
-SubTopic 20
-Name Accounting Standards Codification
-Section 40
-Paragraph 7
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481628/310-20-40-7

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 310
-SubTopic 10
-Name Accounting Standards Codification
-Section 45
-Paragraph 2
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481990/310-10-45-2

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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
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-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479319/326-20-50-16

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Amount of gain (loss) on sale of financing receivable.

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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
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