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Loan to value ratio.

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Loans and lease receivable contractual term.

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Loans and lease receivable prior period.

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Loans and lease receivable subsequent period.

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Loans and lease receivables unamortized fees net of deferred costs and the sale discount.

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Loans and leases receivable number of loans.

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Loans and leases receivable originated.

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Loans and leases receivable payrolls and other operating expenses.

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Loans and leases receivable recognized interest income.

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Loans and leases receivable unamortized processing fee.

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Loans and leases receivables number of loans sold.

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Nonrefundable fees and other costs deferred and amortized as component of loan yield over expected life of loans.

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Number of loan deferrals.

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Percentage of loan earned processing fee one rate.

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Percentage of loan earned processing fee three rate.

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Percentage of loan earned processing fee two rate.

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Percentage of loans receivable interest rate.

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Processing fee for loans balance.

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Processing fee for loans more than loan balance.

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Processing fee for loans more than loan balance percentage.

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Processing fee for loans not more than loan balance.

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Processing fee for loans not more than loan balance percentage.

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Amount of recovery of loans and lease receivables which had previously been fully or partially written-off as bad debts.

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Amount of financing receivable modified as troubled debt restructuring within previous 12 months, with subsequent payment default.

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The gains (losses) included in earnings that represent the difference between the sale price and the carrying value of loans and leases that were sold during the reporting period. This element refers to the gain (loss) and not to the cash proceeds of the sales. This element is a noncash adjustment to net income when calculating net cash generated by operating activities using the indirect method.

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Amount of allowance to cover probable credit losses on loans and leases. Includes carryover of or adjustments to the allowance for loan losses in connection with business combinations. Excludes allowance for loans and leases covered under loss sharing agreements.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Amount before allowance of loans and leases held in portfolio, including but not limited to, commercial and consumer loans. Includes deferred interest and fees, undisbursed portion of loan balance, unamortized costs and premiums and discounts from face amounts. Excludes loans and leases covered under loss sharing agreements.

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Amount of undisbursed portion of the loan receivable balance (loans in process). Excludes loans and leases covered under loss sharing agreements.

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Amount, before valuation allowance, of financing receivable classified as held-for-sale.

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The carrying amount, as of the date of the latest financial statement presented, of loans receivable which are owned but transferred to serve as collateral for the payment of FHLB debt obligations, and for which the transferee is not permitted to sell or re-pledge them to an unrelated party.

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The cash inflow resulting from the sale of loans classified as held-for-sale, including proceeds from loans sold through mortgage securitization.

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Loans and Allowance for Loan Losses - Additional Information (Detail)		1 Months Ended	3 Months Ended	12 Months Ended
	Jun. 28, 2021 USD ($) Loan	Apr. 30, 2020 USD ($)	Jun. 30, 2021 USD ($)	Dec. 31, 2021 USD ($) Loan	Dec. 31, 2020 USD ($) Loan	Dec. 31, 2019 USD ($)
Loans and Leases Receivable Disclosure [Line Items]
Gross loans				$ 1,808,484,000	$ 1,020,965,000
Bad debts recovered				718,000	310,000
Allowance for loan losses				12,121,000	13,827,000	$ 4,572,000
Nonperforming trouble debt restructuring				1,000,000.0	142,000
Proceeds from sale of loans held for sale				1,228,021,000	1,099,378,000
Gain on sale of Paycheck Protection Program loans				24,315,000
Grade 5 Watch [Member]
Loans and Leases Receivable Disclosure [Line Items]
Gross loans				$ 77,821,000	41,695,000
Grade 5 Watch [Member] \| Minimum [Member]
Loans and Leases Receivable Disclosure [Line Items]
Loan To Value Ratio				90.00%
FHLB [Member]
Loans and Leases Receivable Disclosure [Line Items]
Loans held for investment pledged				$ 478,300,000
Payment Deferral [Member]
Loans and Leases Receivable Disclosure [Line Items]
Gross loans				$ 5,200,000	$ 110,600,000
Number of loan deferrals \| Loan				15	550
Payment Deferral [Member] \| Bay Banks [Member]
Loans and Leases Receivable Disclosure [Line Items]
Gross loans				$ 160,000,000.0
Number of loan deferrals \| Loan				400
Paycheck Protection Program [Member]
Loans and Leases Receivable Disclosure [Line Items]
Gross loans				$ 30,742,000	$ 292,068,000
PPP 1 [Member]
Loans and Leases Receivable Disclosure [Line Items]
Payrolls and other operating expenses		$ 650,000,000,000
Loans and lease receivable prior period		2 years
Loans and lease receivable subsequent period		5 years
Percentage of Loans receivable interest rate		1.00%
Percentage of loan earned processing fee one rate		1.00%
Percentage of loan earned processing fee two rate		3.00%
Percentage of loan earned processing fee three rate		5.00%
Loans and leases receivable originated				18,000,000.0	363,400,000
Loans and leases receivable of processing fees, net of agent fees					11,500,000
Loans and leases receivable recognized interest income				4,800,000
Loans and leases receivable unamortized fee				$ 0
PPP 2 [Member]
Loans and Leases Receivable Disclosure [Line Items]
Percentage of Loans receivable interest rate				1.00%
Gross loans	$ 712,600,000			$ 730,000,000
Loans and leases receivable of processing fees, net of agent fees				$ 43,400,000
Number of loans \| Loan				20,000
Loans and lease receivable contractual term				5 years
Loans and leases receivable recognized interest income				$ 12,500,000
Number of loans sold \| Loan	19,500
Proceeds from sale of loans held for sale	$ 705,900,000
Gain on sale of Loans	24,300,000
Unamortized fees net of deferred costs and the sale discount	$ 30,900,000
Financing Receivable, Held-for-Sale				12,700,000
Unamortized fees, net of deferred cost				$ 348,000
Gain on sale of Paycheck Protection Program loans			$ 30,900,000
PPP 2 [Member] \| Maximum [Member]
Loans and Leases Receivable Disclosure [Line Items]
Nonrefundable fees and other costs deferred and amortized as component of loan yield over expected life of loans				3 years
PPP 2 [Member] \| Minimum [Member]
Loans and Leases Receivable Disclosure [Line Items]
Nonrefundable fees and other costs deferred and amortized as component of loan yield over expected life of loans				1 year
PPP 2 [Member] \| Scenario One [Member]
Loans and Leases Receivable Disclosure [Line Items]
Processing fee for loans not more than loan balance				$ 50,000
Processing fee for loans not more than loan balance percentage				50.00%
Processing fee for loans balance				$ 2,500
PPP 2 [Member] \| Scenario Two [Member]
Loans and Leases Receivable Disclosure [Line Items]
Processing fee for loans not more than loan balance				$ 350,000
Processing fee for loans not more than loan balance percentage				5.00%
Processing fee for loans more than loan balance				$ 50,000
PPP 2 [Member] \| Scenario Three [Member]
Loans and Leases Receivable Disclosure [Line Items]
Processing fee for loans more than loan balance				$ 350,000
Processing fee for loans more than loan balance percentage				3.00%
Commercial and Residential Mortgages [Member] \| FHLB [Member]
Loans and Leases Receivable Disclosure [Line Items]
Loans held for investment pledged					213,300,000
Pay Check Protection Loans [Member] \| Paycheck Protection Plan Liquidity Facility Advances [Member]
Loans and Leases Receivable Disclosure [Line Items]
Loans held for investment pledged				$ 17,900,000	$ 281,600,000