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Servicing Assets - Additional Information (Detail) - USD ($) | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020 | Dec. 31, 2020
Risks Inherent In Servicing Assets And Servicing Liabilities [Line Items] |  |  |  |  |
Serviced loans sold to unaffiliated parties | $ 459,800,000 |  | $ 459,800,000 |  | $ 429,400,000
Amortization expense | 532,000 | $ 524,000 | 1,700,000 | $ 1,600,000 |
Fair value of servicing rights | 8,100,000 |  | $ 8,100,000 |  | $ 6,900,000
Minimum |  |  |  |  |
Risks Inherent In Servicing Assets And Servicing Liabilities [Line Items] |  |  |  |  |
Discount rates ranging |  |  | 8.60% |  | 9.30%
Prepayment speeds |  |  | 11.00% |  | 11.80%
Maximum [Member] |  |  |  |  |
Risks Inherent In Servicing Assets And Servicing Liabilities [Line Items] |  |  |  |  |
Discount rates ranging |  |  | 10.50% |  | 12.20%
Prepayment speeds |  |  | 17.40% |  | 19.10%
Other Operating Income |  |  |  |  |
Risks Inherent In Servicing Assets And Servicing Liabilities [Line Items] |  |  |  |  |
Servicing fee income | $ 1,100,000 | $ 1,100,000 | $ 3,400,000 | $ 3,400,000 |

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- Definition All amounts that, per contract, are due to the servicer in exchange for servicing the financial asset and would no longer be received by a servicer if the beneficial owners of the serviced assets (or their trustees or agents) were to exercise their actual or potential authority under the contract to shift the servicing to another servicer. Depending on the servicing contract, those fees may include some or all of the difference between the interest rate collected on the asset being serviced and the rate to be paid to the beneficial owners of the asset. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 50 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=125521744&loc=d3e122596-111746 + Details
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- Definition Fair value of an asset representing net future revenue from contractually specified servicing fees, late charges, and other ancillary revenues, in excess of future costs related to servicing arrangements. + 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 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 50 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6469459&loc=d3e122492-111745 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 50 -Section 50 -Paragraph 3 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=125521744&loc=d3e122625-111746 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 50 -Section 45 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6469459&loc=d3e122501-111745 + Details
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- Definition Estimated rate of prepayments of principal on servicing assets and servicing liabilities. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 50 -Section 50 -Paragraph 2 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=125521744&loc=d3e122596-111746 + Details
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