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Allowance for Loan Losses - Additional Information (Detail)	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2020 USD ($) SecurityLoan	Sep. 30, 2019 USD ($) SecurityLoan	Sep. 30, 2020 USD ($) SecurityLoan	Sep. 30, 2019 USD ($) SecurityLoan	Dec. 31, 2019 USD ($)
Accounts, Notes, Loans and Financing Receivable [Line Items]
Period for calculating Loss migration rates of portfolio segments			3 years
Allowance for loan losses	$ 22,637,000		$ 22,637,000		$ 14,767,000
Provision for loan losses	2,250,000	$ 150,000	$ 7,862,000	$ 150,000
Percentage of eligible paycheck protection program loan			100.00%
Number of days past due for loans to be considered as nonperforming			90 days
Reasonable period for nonperforming TDRs to be returned to performing status			6 months
Number of days reaching where loans are considered for nonaccrual status			90 days
Conditions where loans are considered for nonaccrual status			A loan may be returned to accruing status only if one of three conditions are met: the loan is well-secured and none of the principal and interest has been past due for a minimum of 90 days; the loan is a TDR and has made a minimum of six months payments; or the principal and interest payments are reasonably assured and a sustained period of performance has occurred, generally six months.
Loans modified as troubled debt restructuring	$ 0	$ 0	$ 0	$ 0
Defaulted loans | SecurityLoan	0	0	0	0
Impaired loans			greater than $350
Allowance for loan losses recorded for acquired loans			$ 0		0
Foreclosed assets	$ 0		0		0
Residential Mortgage [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Residential mortgages in process of foreclosure	1,056,000		1,056,000		1,022,000
TDRs [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses	$ 93,000		$ 93,000		$ 91,000

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Carrying amount as of the balance sheet date of all assets obtained in full or partial satisfaction of a debt arrangement through foreclosure proceedings or defeasance; includes real and personal property; equity interests in corporations, partnerships, and joint ventures; and beneficial interests in trusts.

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