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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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