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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 |

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