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 ($)	Dec. 31, 2021 USD ($)
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