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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) $ in Thousands	Dec. 31, 2021 USD ($)	Dec. 31, 2020 USD ($)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt securities, available for sale	$ 3,791,575	$ 1,206,431
Significant Unobservable Inputs (Level 3)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt securities, available for sale	142,885	0
Asset-backed securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt securities, available for sale	297,425	377,145
Asset-backed securities | Significant Unobservable Inputs (Level 3)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt securities, available for sale	142,885
Other real estate owned | Significant Unobservable Inputs (Level 3)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Other real estate owned		35
Residential mortgage loan commitments | Significant Unobservable Inputs (Level 3)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Residential mortgage loan commitments	$ 179	$ 200
Minimum | Asset-backed securities | Significant Unobservable Inputs (Level 3) | Discount rate
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt securities, available-for-sale, measurement input	0.04
Minimum | Asset-backed securities | Significant Unobservable Inputs (Level 3) | Annualized loss rate
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt securities, available-for-sale, measurement input	0.04
Minimum | Asset-backed securities | Significant Unobservable Inputs (Level 3) | Constant prepayment rate
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt securities, available-for-sale, measurement input	0.17
Minimum | Other real estate owned | Significant Unobservable Inputs (Level 3) | Liquidation expenses
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Other real estate owned, measurement input		0.08
Minimum | Residential mortgage loan commitments | Significant Unobservable Inputs (Level 3) | Pull-through rate
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Residential mortgage loans, measurement input	0.76	0.78
Maximum | Asset-backed securities | Significant Unobservable Inputs (Level 3) | Discount rate
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt securities, available-for-sale, measurement input	0.05
Maximum | Asset-backed securities | Significant Unobservable Inputs (Level 3) | Annualized loss rate
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt securities, available-for-sale, measurement input	0.04
Maximum | Asset-backed securities | Significant Unobservable Inputs (Level 3) | Constant prepayment rate
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt securities, available-for-sale, measurement input	0.33
Maximum | Other real estate owned | Significant Unobservable Inputs (Level 3) | Liquidation expenses
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Other real estate owned, measurement input		0.09
Maximum | Residential mortgage loan commitments | Significant Unobservable Inputs (Level 3) | Pull-through rate
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Residential mortgage loans, measurement input	0.89	0.78
Weighted Average | Asset-backed securities | Significant Unobservable Inputs (Level 3) | Discount rate
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt securities, available-for-sale, measurement input	0.05
Weighted Average | Asset-backed securities | Significant Unobservable Inputs (Level 3) | Annualized loss rate
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt securities, available-for-sale, measurement input	0.04
Weighted Average | Asset-backed securities | Significant Unobservable Inputs (Level 3) | 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
Weighted Average | Other real estate owned | Significant Unobservable Inputs (Level 3) | Liquidation expenses
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Other real estate owned, measurement input		0.09
Weighted Average | Residential mortgage loan commitments | Significant Unobservable Inputs (Level 3) | Pull-through rate
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Residential mortgage loans, measurement input	0.85	0.78
Real estate | Collateral-dependent loans | Significant Unobservable Inputs (Level 3)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Collateral-dependent loans	$ 4,170	$ 2,928
Real estate | Minimum | Collateral-dependent loans | Significant Unobservable Inputs (Level 3) | Liquidation expenses
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Collateral-dependent loans, measurement input	0.08	0.08
Real estate | Maximum | Collateral-dependent loans | Significant Unobservable Inputs (Level 3) | Liquidation expenses
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Collateral-dependent loans, measurement input	0.08	0.08
Real estate | Weighted Average | Collateral-dependent loans | Significant Unobservable Inputs (Level 3) | 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 | Collateral-dependent loans | Significant Unobservable Inputs (Level 3)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Collateral-dependent loans	$ 951	$ 939
Commercial and industrial | Minimum | Collateral-dependent loans | Significant Unobservable Inputs (Level 3) | Liquidation expenses
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Collateral-dependent loans, measurement input	0.08	0.07
Commercial and industrial | Minimum | Collateral-dependent loans | Significant Unobservable Inputs (Level 3) | Business asset valuation adjustments
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Collateral-dependent loans, measurement input	0.20	0.60
Commercial and industrial | Maximum | Collateral-dependent loans | Significant Unobservable Inputs (Level 3) | Liquidation expenses
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Collateral-dependent loans, measurement input	0.26	0.08
Commercial and industrial | Maximum | Collateral-dependent loans | Significant Unobservable Inputs (Level 3) | Business asset valuation adjustments
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Collateral-dependent loans, measurement input	0.20	0.60
Commercial and industrial | Weighted Average | Collateral-dependent loans | Significant Unobservable Inputs (Level 3) | Liquidation expenses
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Collateral-dependent loans, measurement input	0.12	0.08
Commercial and industrial | Weighted Average | Collateral-dependent loans | Significant Unobservable Inputs (Level 3) | Business asset valuation adjustments
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Collateral-dependent loans, measurement input	0.20	0.60

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Carrying amount as of the balance sheet date of other real estate and foreclosed assets. Other real estate may include real estate investments, real estate loans that qualify as investments in real estate, and premises that are no longer used in operations may also be included in real estate owned. Foreclosed assets include all assets obtained in full or partial satisfaction of a debt arrangement through foreclosure proceedings.

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