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Loans and Allowance for Loan Losses - Summary of Primary Segments of ALLL, Loans Individually and Collectively Evaluated for Impairment (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021		Sep. 30, 2020
Financing Receivable Impaired [Line Items]
ALL, beginning of period	$ 13,007	$ 8,206	$ 13,827	[1]	$ 4,572
Charge-offs	(512)	(213)	(1,871)		(787)
Recoveries	119	130	658		263
Provision for loan losses		4,000			8,075
ALL, end of period	12,614	12,123	12,614		12,123
Commercial and Industrial [Member]
Financing Receivable Impaired [Line Items]
Charge-offs	(18)		(968)
Recoveries	26	33	210		34
Consumer [Member]
Financing Receivable Impaired [Line Items]
Charge-offs	(361)	(213)	(757)		(787)
Recoveries	$ 88	$ 97	$ 340		$ 229
[1] Derived from audited December 31, 2020 Consolidated Financial Statements.

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- Definition

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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