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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		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021		Jun. 30, 2020
Financing Receivable Impaired [Line Items]
ALL, beginning of period	$ 13,402	$ 4,897	$ 13,827	[1]	$ 4,572
Charge-offs	(991)	(255)	(1,625)		(574)
Recoveries	596	64	805		133
Provision for loan losses		3,500			4,075
ALL, end of period	13,007	8,206	13,007		8,206
Individually evaluated for impairment	444		444
Collectively evaluated for impairment	12,563		12,563
Commercial and Industrial [Member]
Financing Receivable Impaired [Line Items]
ALL, beginning of period	3,459		3,762
Charge-offs	(857)		(1,216)
Recoveries	394		450		1
Provision for loan losses	502		502
ALL, end of period	3,498		3,498
Collectively evaluated for impairment	3,498		3,498
Construction, Commercial [Member] | Real Estate [Member]
Financing Receivable Impaired [Line Items]
ALL, beginning of period	960		960
Provision for loan losses	(208)		(208)
ALL, end of period	752		752
Collectively evaluated for impairment	752		752
Construction, Residential [Member] | Real Estate [Member]
Financing Receivable Impaired [Line Items]
ALL, beginning of period	150		150
Provision for loan losses	(72)		(72)
ALL, end of period	78		78
Collectively evaluated for impairment	78		78
Mortgage, Commercial [Member] | Real Estate [Member]
Financing Receivable Impaired [Line Items]
ALL, beginning of period	4,215		4,215
Recoveries	79		79
Provision for loan losses	1,953		1,953
ALL, end of period	6,247		6,247
Individually evaluated for impairment	387		387
Collectively evaluated for impairment	5,860		5,860
Mortgage, Residential [Member] | Real Estate [Member]
Financing Receivable Impaired [Line Items]
ALL, beginning of period	1,485		1,481
Charge-offs	(1)		(13)
Recoveries	8		24
Provision for loan losses	(734)		(734)
ALL, end of period	758		758
Individually evaluated for impairment	57		57
Collectively evaluated for impairment	701		701
Mortgage, Farmland [Member] | Real Estate [Member]
Financing Receivable Impaired [Line Items]
ALL, beginning of period	18		18
Provision for loan losses	5		5
ALL, end of period	23		23
Collectively evaluated for impairment	23		23
Consumer [Member]
Financing Receivable Impaired [Line Items]
ALL, beginning of period	3,115		3,241
Charge-offs	(133)	(255)	(396)		(574)
Recoveries	115	$ 64	252		$ 132
Provision for loan losses	(1,446)		(1,446)
ALL, end of period	1,651		1,651
Collectively evaluated for impairment	$ 1,651		$ 1,651
[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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