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Fair Value Measurement - Quantitative Information about Recurring Level 3 Fair Value Measurements (Detail) - Mortgage servicing rights $ in Thousands | Sep. 30, 2020 USD ($) | Dec. 31, 2019 USD ($)
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Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Mortgages servicing rights, fair value | $ 4,920 | $ 6,200
Minimum | Valuation Technique, Discounted Cash Flow | Measurement Input, Constant Prepayment Rate |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Measurement input | 0.15 | 0.06
Minimum | Valuation Technique, Discounted Cash Flow | Measurement Input, Discount Rate |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Measurement input | 0.10 | 0.10
Maximum | Valuation Technique, Discounted Cash Flow | Measurement Input, Constant Prepayment Rate |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Measurement input | 0.32 | 0.420
Maximum | Valuation Technique, Discounted Cash Flow | Measurement Input, Discount Rate |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Measurement input | 0.14 | 0.14
Weighted Average | Valuation Technique, Discounted Cash Flow | Measurement Input, Constant Prepayment Rate |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Measurement input | 0.19 | 0.110
Weighted Average | Valuation Technique, Discounted Cash Flow | Measurement Input, Discount Rate |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Measurement input | 0.12 | 0.12

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- Definition 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 No definition available. + 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 -URI http://asc.fasb.org/extlink&oid=6469459&loc=d3e122501-111745 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 50 -Section 50 -Paragraph 3 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=116651436&loc=d3e122625-111746 + Details
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