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Fair Value - Additional Information (Detail) $ in Millions	9 Months Ended
	Sep. 30, 2023 USD ($) $ / shares	Dec. 31, 2022 USD ($)
Servicing Assets At Fair Value [Line Items]
Servicing rights of sold loans	$ 2,130.0	$ 2,160.0
Weighted average net servicing fee income, Basis points	0.283%
Weighted average prepayment speed assumption used in the fair value	7.87%
Weighted average discount rate	9.92%
Minimum [Member]
Servicing Assets At Fair Value [Line Items]
Estimated base annual servicing costs | $ / shares	75
Weighted average discount rate	9.50%
Maximum [Member]
Servicing Assets At Fair Value [Line Items]
Estimated base annual servicing costs | $ / shares	85
Weighted average discount rate	11.50%
11 Corporate Bonds | Level 3 [Member]
Servicing Assets At Fair Value [Line Items]
Purchase price	$ 3.8
Six Mortgage Backed Securities | Level 3 [Member]
Servicing Assets At Fair Value [Line Items]
Purchase price	$ 7.4

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- Definition

Assumption for fair value of assets or liabilities that relate to transferor's continuing involvement estimated base annual servicing costs per loan.

+ References

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- Definition

Estimated rate of prepayment of principal on financial assets regardless of when the transfer occurred.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 860
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 4
-Subparagraph (b)(2)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147481326/860-20-50-4

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- Definition

Aggregate amount of servicing assets that are subsequently measured at fair value and servicing assets that are subsequently measured using the amortization method.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 860
-SubTopic 50
-Name Accounting Standards Codification
-Section 45
-Paragraph 2
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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/2003/role/disclosureRef
-Topic 860
-SubTopic 50
-Name Accounting Standards Codification
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