Loans - Schedule of Allowances for Loan Losses by Portfolio Segment (Detail) - USD ($) $ in Thousands	3 Months Ended
Mar. 31, 2022	Mar. 31, 2021
Financing Receivable, Allowance for Credit Losses [Line Items]
Beginning balance	$ 7,618	$ 8,274
(RECOVERY OF) PROVISION FOR LOAN LOSSES	(300)	30
Charge-offs	(31)	(5)
Recoveries	18	39
Net (charge-offs) recoveries	(13)	34
Ending balance	7,305	8,338
Commercial [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Beginning balance	1,240	1,739
(RECOVERY OF) PROVISION FOR LOAN LOSSES	(65)	(115)
Charge-offs	(10)	(3)
Recoveries	4	19
Net (charge-offs) recoveries	(6)	16
Ending balance	1,169	1,640
Commercial Real Estate [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Beginning balance	2,838	3,469
(RECOVERY OF) PROVISION FOR LOAN LOSSES	(288)	20
Ending balance	2,550	3,489
Residential Real Estate [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Beginning balance	992	1,156
(RECOVERY OF) PROVISION FOR LOAN LOSSES	46	(23)
Recoveries	1	1
Net (charge-offs) recoveries	1	1
Ending balance	1,039	1,134
Construction & Land Development [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Beginning balance	1,380	756
(RECOVERY OF) PROVISION FOR LOAN LOSSES	154	44
Ending balance	1,534	800
Consumer [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Beginning balance	421	352
(RECOVERY OF) PROVISION FOR LOAN LOSSES	(31)	(79)
Charge-offs	(21)	(2)
Recoveries	13	19
Net (charge-offs) recoveries	(8)	17
Ending balance	382	290
Unallocated [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Beginning balance	747	802
(RECOVERY OF) PROVISION FOR LOAN LOSSES	(116)	183
Ending balance	$ 631	$ 985

(Recovery) of provision for loan losses.

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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.

+ References

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Amount of other addition (reduction) in allowance reserve for credit loss.

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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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+ References

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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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