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Allowance for Loans Losses - Summary of Allowance for Loans Losses (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019	Dec. 31, 2019
Financing Receivable, Impaired [Line Items]
Allowance, beginning of period			$ 4,572	$ 3,580	$ 3,580
Charge-offs			(787)		(961)
Recoveries			263		211
Net charge-offs			(524)		(750)
Provision for loan losses	$ 4,000	$ 570	8,075	$ 1,465	1,742
Allowance, end of period	$ 12,123		12,123		4,572
Commercial and Industrial [Member]
Financing Receivable, Impaired [Line Items]
Charge-offs					(43)
Recoveries			34
Real Estate, Mortgage [Member]
Financing Receivable, Impaired [Line Items]
Charge-offs					(4)
Recoveries					6
Consumer and Other Loans [Member]
Financing Receivable, Impaired [Line Items]
Charge-offs			(787)		(914)
Recoveries			$ 229		$ 205

X

- Definition

Amount of recovery of loans and lease receivables which had previously been fully or partially written-off as bad debts.

+ References

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Amount of loans and leases that have been written off from both loan receivables and allowance reserve for credit loss.

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Amount, after recoveries, of loans and leases that have been written-off.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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- Definition

Amount of allowance to cover probable credit losses on loans and leases. Includes carryover of or adjustments to the allowance for loan losses in connection with business combinations. Excludes allowance for loans and leases covered under loss sharing agreements.

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Amount of expense related to estimated loss from loan and lease transactions.

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