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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
	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
Provision for loan losses			575	$ 575
ALL, end of period	13,402		4,897
Individually evaluated for impairment			144
Collectively evaluated for impairment	13,402		4,753
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
Individually evaluated for impairment			144
Collectively evaluated for impairment	3,459		784
Construction, Commercial [Member] | Real Estate [Member]
Financing Receivable Impaired [Line Items]
ALL, beginning of period	960		220
Provision for loan losses			27
ALL, end of period	960		247
Collectively evaluated for impairment	960		247
Construction, Residential [Member] | Real Estate [Member]
Financing Receivable Impaired [Line Items]
ALL, beginning of period	150		60
Provision for loan losses			11
ALL, end of period	150		71
Collectively evaluated for impairment	150		71
Mortgage, Commercial [Member] | Real Estate [Member]
Financing Receivable Impaired [Line Items]
ALL, beginning of period	4,215		1,604
Provision for loan losses			62
ALL, end of period	4,215		1,666
Collectively evaluated for impairment	4,215		1,666
Mortgage, Residential [Member] | Real Estate [Member]
Financing Receivable Impaired [Line Items]
ALL, beginning of period	1,481		510
Charge-offs	(12)
Recoveries	16
Provision for loan losses			16
ALL, end of period	1,485		526
Collectively evaluated for impairment	1,485		526
Mortgage, Farmland [Member] | Real Estate [Member]
Financing Receivable Impaired [Line Items]
ALL, beginning of period	18		9
ALL, end of period	18		9
Collectively evaluated for impairment	18		9
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
Collectively evaluated for impairment	$ 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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