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Loans and Allowance for Loan Losses - Additional Information (Detail)		1 Months Ended	3 Months Ended	6 Months Ended		12 Months Ended
	Jun. 28, 2021 USD ($) Loan	Apr. 30, 2020 USD ($)	Jun. 30, 2021 USD ($) Loan	Jun. 30, 2021 USD ($) Loan	Jun. 30, 2020 USD ($)	Dec. 31, 2020 USD ($) Loan	Jan. 31, 2021 USD ($) Loan
Loans and Leases Receivable Disclosure [Line Items]
Gross loans			$ 1,860,878,000	$ 1,860,878,000		$ 1,025,687,000
Proceeds from sale of loans held for sale				679,905,000	$ 315,200,000
Gain on sale of Paycheck Protection Program loans			24,315,000	24,315,000
Nonperforming trouble debt restructuring				192,000		142,000
Payment Deferral [Member]
Loans and Leases Receivable Disclosure [Line Items]
Gross loans			$ 5,200,000	$ 5,200,000		$ 110,600,000
Number of loan deferrals | Loan			16	16		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
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
Gross loans			$ 115,000,000.0	$ 115,000,000.0
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			69,000,000	$ 69,000,000
Loans and leases receivable recognized interest income			$ 1,100,000	$ 3,300,000
PPP 2 [Member]
Loans and Leases Receivable Disclosure [Line Items]
Percentage of Loans receivable interest rate			1.00%	1.00%
Gross loans	$ 712,600,000		$ 728,000,000.0	$ 728,000,000.0
Number of loans | Loan				20,000
Loans and lease receivable contractual term				5 years
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
Loans and Lease Receivables Number of Loans Held for Sale | Loan				600
Financing Receivable, Held-for-Sale			15,700,000	$ 15,700,000
Unamortized fees, net of deferred cost			367,000	367,000
Loans and leases receivable of processing fees, net of agent fees			40,800,000	40,800,000
Loans and leases receivable recognized interest income			8,400,000	$ 9,500,000
Gain on sale of Paycheck Protection Program loans			30,900
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	$ 50,000
Processing fee for loans not more than loan balance percentage			50.00%	50.00%
Processing fee for loans balance			$ 2,500	$ 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	$ 350,000
Processing fee for loans not more than loan balance percentage			5.00%	5.00%
Processing fee for loans more than loan balance			$ 50,000	$ 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	$ 350,000
Processing fee for loans more than loan balance percentage			3.00%	3.00%
Commercial and Residential Mortgages [Member] | FHLB [Member]
Loans and Leases Receivable Disclosure [Line Items]
Loans pledged			$ 598,400,000	$ 598,400,000		213,300,000
Pay Check Protection Loans [Member] | Paycheck Protection Plan Liquidity Facility Advances [Member]
Loans and Leases Receivable Disclosure [Line Items]
Loans pledged			97,400,000	97,400,000		281,600,000
Paycheck Protection Program [Member]
Loans and Leases Receivable Disclosure [Line Items]
Gross loans			$ 130,489,000	$ 130,489,000		$ 292,068,000

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