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Fair Value Measurement - Quantitative Information about Level 3 Fair Value Measurements (Detail) - Assets Measured at Fair Value on a Nonrecurring Basis [Member] $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2022 USD ($) | Dec. 31, 2021 USD ($)
Impaired Loans [Member] |  |
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |  |
Fair Value |  | $ 11
Mortgage Servicing Rights [Member] |  |
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |  |
Fair Value |  | 2,642
(Level 3) [Member] | Impaired Loans [Member] |  |
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |  |
Fair Value | $ 11 | $ 11
Valuation Technique | Appraisal of collateral | Appraisal of collateral
(Level 3) [Member] | Impaired Loans [Member] | Measurement Input, Appraised Value [Member] |  |
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |  |
Unobservable Input | 10 |
(Level 3) [Member] | Impaired Loans [Member] | Measurement Input, Appraised Value [Member] | Minimum [Member] |  |
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |  |
Unobservable Input |  | 10
(Level 3) [Member] | Impaired Loans [Member] | Measurement Input, Appraised Value [Member] | Weighted Average [Member] |  |
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |  |
Unobservable Input | 10 | 10
(Level 3) [Member] | Impaired Loans [Member] | Measurement Input Holding Period [Member] |  |
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |  |
Impaired loans, Term | 24 months | 24 months
(Level 3) [Member] | 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 | 24 months
(Level 3) [Member] | Mortgage Servicing Rights [Member] |  |
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |  |
Fair Value | $ 2,678 | $ 2,642
Valuation Technique | Discounted Cash Flow | Discounted Cash Flow
(Level 3) [Member] | Mortgage Servicing Rights [Member] | Constant Prepayment Rate [Member] | Minimum [Member] |  |
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |  |
Unobservable Input | 8.0 | 8
(Level 3) [Member] | Mortgage Servicing Rights [Member] | Constant Prepayment Rate [Member] | Maximum [Member] |  |
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |  |
Unobservable Input | 30 | 35
(Level 3) [Member] | Mortgage Servicing Rights [Member] | Constant Prepayment Rate [Member] | Weighted Average [Member] |  |
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |  |
Unobservable Input | 10 | 15
(Level 3) [Member] | Mortgage Servicing Rights [Member] | Discount Rate [Member] |  |
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |  |
Unobservable Input | 12 | 12
(Level 3) [Member] | 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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