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Loans - Narrative (Details) - USD ($)			9 Months Ended
	Sep. 30, 2024	Dec. 31, 2023	Sep. 30, 2024	Sep. 30, 2023
Accounts, Notes, Loans and Financing Receivable [Line Items]
PCD loans	$ 25,000,000	$ 34,800,000
Accrued interest	36,100,000		$ 36,100,000	$ 33,000,000
Nonaccrual mortgage loans held for sale recorded at fair value	0	0	0
Funding commitments	$ 745,000,000	$ 1,600,000	745,000,000
Nonperforming Financial Instruments
Accounts, Notes, Loans and Financing Receivable [Line Items]
Interest income			$ 0	$ 0

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Loans And Leases Receivable, Impaired, Interest On Nonaccrual Loans

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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.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 310
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Amount, before allowance for credit loss, of accrued interest on financing receivable.

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Amount at purchase price of financing receivable purchased with credit deterioration.

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-Topic 326
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Amount of commitment to lend additional funds to debtor experiencing financial difficulty for which creditor has modified terms of financing receivable.

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Fair value portion of mortgage loans held-for-sale.

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