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Fair Value - Additional Information (Detail) | 12 Months Ended |
--- | --- | ---
Dec. 31, 2022 USD ($) $ / shares | Dec. 31, 2021 USD ($)
Servicing Assets At Fair Value [Line Items] |  |
Servicing rights of sold loans | $ 2,160,000,000 | $ 1,910,000,000
Weighted average net servicing fee income, Basis points | 0.284% |
Weighted average prepayment speed assumption used in the fair value | 8.17% |
Weighted average discount rate | 9.43% |
Paycheck Protection Program [Member] |  |
Servicing Assets At Fair Value [Line Items] |  |
Credit risk | $ 0 |
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 | 14.50% |
MSR Assets [Member] |  |
Servicing Assets At Fair Value [Line Items] |  |
Amortized cost of assets | $ 28,991,000 |

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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 https://asc.fasb.org/extlink&oid=121570589&loc=d3e107314-111719 + Details
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