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Disclosures About Fair Value of Financial Instruments - Summary of Financial Assets and Financial Liabilities Measured at Fair Value on Recurring and Nonrecurring Basis (Detail) - Significant Unobservable Inputs (Level 3) $ in Thousands | Mar. 31, 2022 USD ($) | Dec. 31, 2021 USD ($)
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Asset-backed securities |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Debt securities, available for sale | $ 121,853 | $ 142,885
Residential mortgage loan commitments |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Residential mortgage loan commitments | $ 149 | $ 179
Minimum | Asset-backed securities | Discount rate |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Debt securities, available-for-sale, measurement input | 0.04 | 0.04
Minimum | Asset-backed securities | Annualized loss rate |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Debt securities, available-for-sale, measurement input | 0.07 | 0.04
Minimum | Asset-backed securities | Constant prepayment rate |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Debt securities, available-for-sale, measurement input | 0.16 | 0.17
Minimum | Residential mortgage loan commitments | Pull-through rate |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Residential mortgage loans, measurement input | 0.69 | 0.76
Maximum | Asset-backed securities | Discount rate |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Debt securities, available-for-sale, measurement input | 0.06 | 0.05
Maximum | Asset-backed securities | Annualized loss rate |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Debt securities, available-for-sale, measurement input | 0.08 | 0.04
Maximum | Asset-backed securities | Constant prepayment rate |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Debt securities, available-for-sale, measurement input | 0.30 | 0.33
Maximum | Residential mortgage loan commitments | Pull-through rate |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Residential mortgage loans, measurement input | 0.88 | 0.89
Weighted Average | Asset-backed securities | Discount rate |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Debt securities, available-for-sale, measurement input | 0.04 | 0.05
Weighted Average | Asset-backed securities | Annualized loss rate |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Debt securities, available-for-sale, measurement input | 0.08 | 0.04
Weighted Average | Asset-backed securities | Constant prepayment rate |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Debt securities, available-for-sale, measurement input | 0.19 | 0.19
Weighted Average | Residential mortgage loan commitments | Pull-through rate |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Residential mortgage loans, measurement input | 0.82 | 0.85
Real Estate | Collateral-dependent loans |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Collateral-dependent loans | $ 1,809 | $ 4,170
Real Estate | Minimum | Collateral-dependent loans | Liquidation expenses |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Collateral-dependent loans, measurement input | 0.05 | 0.08
Real Estate | Maximum | Collateral-dependent loans | Liquidation expenses |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Collateral-dependent loans, measurement input | 0.05 | 0.08
Real Estate | Weighted Average | Collateral-dependent loans | Liquidation expenses |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Collateral-dependent loans, measurement input | 0.05 | 0.08
Commercial and industrial | Collateral-dependent loans |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Collateral-dependent loans | $ 676 | $ 951
Commercial and industrial | Minimum | Collateral-dependent loans | Liquidation expenses |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Collateral-dependent loans, measurement input | 0.08 | 0.08
Commercial and industrial | Minimum | Collateral-dependent loans | Business asset valuation adjustments |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Collateral-dependent loans, measurement input | 0.25 | 0.20
Commercial and industrial | Maximum | Collateral-dependent loans | Liquidation expenses |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Collateral-dependent loans, measurement input | 0.26 | 0.26
Commercial and industrial | Maximum | Collateral-dependent loans | Business asset valuation adjustments |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Collateral-dependent loans, measurement input | 0.27 | 0.20
Commercial and industrial | Weighted Average | Collateral-dependent loans | Liquidation expenses |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Collateral-dependent loans, measurement input | 0.13 | 0.12
Commercial and industrial | Weighted Average | Collateral-dependent loans | Business asset valuation adjustments |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Collateral-dependent loans, measurement input | 0.26 | 0.20

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