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Loans and Allowance for Loan Losses - Summary of Allowance for Loans Losses (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021		Mar. 31, 2020	Mar. 31, 2019
Financing Receivable Impaired [Line Items]
ALL, beginning of period	$ 13,827	[1]	$ 4,572
Charge-offs	(634)		(319)
Recoveries	209		69
Net charge-offs	(425)		(250)
Provision for loan losses			575	$ 575
ALL, end of period	13,402		4,897
Commercial and Industrial [Member]
Financing Receivable Impaired [Line Items]
ALL, beginning of period	3,762		841
Charge-offs	(359)
Recoveries	56		1
Provision for loan losses			86
ALL, end of period	3,459		928
Real Estate, Mortgage [Member]
Financing Receivable Impaired [Line Items]
Charge-offs	(12)
Recoveries	16
Consumer [Member]
Financing Receivable Impaired [Line Items]
ALL, beginning of period	3,241		1,328
Charge-offs	(263)		(319)
Recoveries	137		68
Provision for loan losses			373
ALL, end of period	$ 3,115		$ 1,450
[1] Derived from audited December 31, 2020 Consolidated Financial Statements.

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

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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 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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