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v3.21.2

Fair Value Measurement - Quantitative Information about Level 3 Fair Value Measurements (Detail) - Assets Measured at Fair Value on a Nonrecurring Basis [Member] - (Level 3) [Member] $ in Thousands | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2021 USD ($) | Dec. 31, 2020 USD ($)
Impaired Loans [Member] |  |
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |  |
Fair Value | $ 11 | $ 1
Valuation Technique | Appraisal of collateral | Appraisal of collateral
Impaired Loans [Member] | Measurement Input, Appraised Value [Member] |  |
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |  |
Unobservable Input | 10 |
Impaired Loans [Member] | Measurement Input, Appraised Value [Member] | Minimum [Member] |  |
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |  |
Unobservable Input |  | 0
Impaired Loans [Member] | Measurement Input, Appraised Value [Member] | Maximum [Member] |  |
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |  |
Unobservable Input |  | 30
Impaired Loans [Member] | Measurement Input, Appraised Value [Member] | Weighted Average [Member] |  |
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |  |
Unobservable Input | 10 | 19
Impaired Loans [Member] | Measurement Input Holding Period [Member] |  |
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |  |
Impaired loans, Term | 24 months | 23 months
Impaired Loans [Member] | Measurement Input Holding Period [Member] | Weighted Average [Member] |  |
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |  |
Impaired loans, Term | 24 months | 23 months
Other Real Estate Owned [Member] |  |
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |  |
Fair Value | $ 26 | $ 31
Valuation Technique | Appraisal of collateral | Appraisal of collateral
Other Real Estate Owned [Member] | Measurement Input, Appraised Value [Member] |  |
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |  |
Unobservable Input | 10 | 10
Other Real Estate Owned [Member] | Measurement Input, Appraised Value [Member] | Weighted Average [Member] |  |
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |  |
Unobservable Input | 10 | 10
Mortgage Servicing Rights [Member] |  |
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |  |
Fair Value | $ 2,576 | $ 2,246
Valuation Technique | Discounted Cash Flow | Discounted Cash Flow
Mortgage Servicing Rights [Member] | Constant Prepayment Rate [Member] | Minimum [Member] |  |
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |  |
Unobservable Input | 8.7 | 12
Mortgage Servicing Rights [Member] | Constant Prepayment Rate [Member] | Maximum [Member] |  |
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |  |
Unobservable Input | 35 | 50
Mortgage Servicing Rights [Member] | Constant Prepayment Rate [Member] | Weighted Average [Member] |  |
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |  |
Unobservable Input | 16 | 22
Mortgage Servicing Rights [Member] | Discount Rate [Member] |  |
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |  |
Unobservable Input | 12 | 12
Mortgage Servicing Rights [Member] | Discount Rate [Member] | Weighted Average [Member] |  |
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |  |
Unobservable Input | 12 | 12

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