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Fair Value - Additional Information (Detail) | 9 Months Ended |
--- | --- | ---
Sep. 30, 2021 USD ($) $ / shares | Dec. 31, 2020 USD ($)
Servicing Assets At Fair Value [Line Items] |  |
Servicing rights of sold loans | $ | $ 1,750,000,000 | $ 846,500,000
Weighted average net servicing fee income, Basis points | 0.281% |
Weighted average prepayment speed assumption used in the fair value | 12.16% |
Weighted average discount rate | 9.30% |
Minimum [Member] |  |
Servicing Assets At Fair Value [Line Items] |  |
Estimated base annual servicing costs | $ / shares | 65.00 |
Base discount rate | 9.00% |
Maximum [Member] |  |
Servicing Assets At Fair Value [Line Items] |  |
Estimated base annual servicing costs | $ / shares | 80.00 |
Base discount rate | 12.00% |
Paycheck Protection Program [Member] |  |
Servicing Assets At Fair Value [Line Items] |  |
Credit risk | $ | $ 0 |
PPP 1 [Member] |  |
Servicing Assets At Fair Value [Line Items] |  |
Loan forgiveness period | 1 year 6 months |
PPP 2 [Member] | Minimum [Member] |  |
Servicing Assets At Fair Value [Line Items] |  |
Loan forgiveness period | 1 year |
PPP 2 [Member] | Maximum [Member] |  |
Servicing Assets At Fair Value [Line Items] |  |
Loan forgiveness period | 3 years |

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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 No definition available. + Details
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- Definition Assumption for fair value of assets or liabilities that relate to transferor's continuing involvement weighted average net servicing fee income basis points. + References No definition available. + Details
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- Definition Discount rate which is used to value residual cash flows generated by financial assets of a securitization, asset-backed financing arrangement, or similar transfer regardless of when the transfer occurred. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 20 -Section 50 -Paragraph 4 -Subparagraph (b)(1) -URI http://asc.fasb.org/extlink&oid=121570589&loc=d3e107314-111719 + Details
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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 -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 20 -Section 50 -Paragraph 4 -Subparagraph (b)(2) -URI http://asc.fasb.org/extlink&oid=121570589&loc=d3e107314-111719 + Details
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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 -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 50 -Section 45 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6469459&loc=d3e122501-111745 + Details
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