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Loans and Allowance for Loan Losses - Additional Information (Detail) | 1 Months Ended | 3 Months Ended | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | ---
Apr. 30, 2020 USD ($) | Mar. 31, 2021 USD ($) Loan | Dec. 31, 2020 USD ($) Loan | Jan. 31, 2021 USD ($) Loan | Mar. 31, 2020 USD ($) | Dec. 31, 2019 USD ($)
Loans and Leases Receivable Disclosure [Line Items] |  |  |  |  |  |  |
Gross loans |  | $ 2,316,726,000 | $ 1,025,687,000 |  |  |  |
Allowance for loan losses |  | 13,402,000 | 13,827,000 | [1] |  | $ 4,897,000 | $ 4,572,000
Nonperforming trouble debt restructuring |  | 293,000 | 142,000 |  |  |  |
Payment Deferral [Member] |  |  |  |  |  |  |
Loans and Leases Receivable Disclosure [Line Items] |  |  |  |  |  |  |
Gross loans |  | $ 31,000,000 | $ 110,600,000 |  |  |  |
Number of loan deferrals | Loan |  | 30 | 550 |  |  |  |
Payment Deferral [Member] | Bay Banks [Member] |  |  |  |  |  |  |
Loans and Leases Receivable Disclosure [Line Items] |  |  |  |  |  |  |
Gross loans |  |  |  |  | $ 160,000,000 |  |
Number of loan deferrals | Loan |  |  |  |  | 400 |  |
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 |  |  | $ 363,400,000 |  |  |  |
Loans and leases receivable forgiven |  |  | 71,300,000 |  |  |  |
Gross loans |  | $ 261,000,000 |  |  |  |  |
Nonrefundable fees and other costs deferred and amortized as component of loan yield over expected life of loans |  | 1 year 6 months |  |  |  |  |
Loans and leases receivable of processing fees, net of agent fees |  |  | 11,500,000 |  |  |  |
Loans and leases receivable unamortized fee |  | $ 1,300,000 |  |  |  |  |
Loans and leases receivable recognized interest income |  | $ 2,200,000 |  |  |  |  |
PPP 2 [Member] |  |  |  |  |  |  |
Loans and Leases Receivable Disclosure [Line Items] |  |  |  |  |  |  |
Percentage of Loans receivable interest rate |  | 1.00% |  |  |  |  |
Loans and leases receivable forgiven |  | $ 0 |  |  |  |  |
Gross loans |  | $ 348,000,000 |  |  |  |  |
Number of loans | Loan |  | 3,800 |  |  |  |  |
Loans and lease receivable contractual term |  | 5 years |  |  |  |  |
Loans and leases receivable of processing fees, net of agent fees |  | $ 11,200,000 |  |  |  |  |
Loans and leases receivable unamortized fee |  | 10,100,000 |  |  |  |  |
Loans and leases receivable recognized interest income |  | $ 1,100,000 |  |  |  |  |
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] | 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] | 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 pledged |  | $ 567,000,000 | 213,300,000 |  |  |  |
Pay Check Protection Loans [Member] | Paycheck Protection Plan Liquidity Facility Advances [Member] |  |  |  |  |  |  |
Loans and Leases Receivable Disclosure [Line Items] |  |  |  |  |  |  |
Loans pledged |  | 509,700,000 | 281,600,000 |  |  |  |
Paycheck Protection Program [Member] |  |  |  |  |  |  |
Loans and Leases Receivable Disclosure [Line Items] |  |  |  |  |  |  |
Gross loans |  | 608,692,000 | 292,068,000 |  |  |  |
Allowance for loan losses |  | $ 0 | $ 0 |  |  |  |
[1] | Derived from audited December 31, 2020 Consolidated Financial Statements.

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