Loans - Schedule of Allowances for Loan Losses by Portfolio Segment (Detail) - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Financing Receivable, Allowance for Credit Losses [Line Items]
Beginning balance	$ 8,274	$ 7,017	$ 5,907
Provision for loan losses	(655)	1,650	1,140
Charge-offs	(130)	(642)	(258)
Recoveries	129	249	228
Net (charge-offs) recoveries	(1)	(393)	(30)
Ending balance	7,618	8,274	7,017
Commercial [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Beginning balance	1,739	2,408	2,178
Provision for loan losses	(495)	(722)	102
Charge-offs	(35)	(77)	(47)
Recoveries	31	130	175
Net (charge-offs) recoveries	(4)	53	128
Ending balance	1,240	1,739	2,408
Commercial Real Estate [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Beginning balance	3,469	2,153	1,791
Provision for loan losses	(639)	1,413	361
Charge-offs		(138)
Recoveries	8	41	1
Net (charge-offs) recoveries	8	(97)	1
Ending balance	2,838	3,469	2,153
Residential Real Estate [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Beginning balance	1,156	1,152	1,245
Provision for loan losses	(189)	16	(100)
Charge-offs		(15)
Recoveries	25	3	7
Net (charge-offs) recoveries	25	(12)	7
Ending balance	992	1,156	1,152
Construction & Land Development [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Beginning balance	756	203	258
Provision for loan losses	624	865	(55)
Charge-offs		(312)
Net (charge-offs) recoveries		(312)
Ending balance	1,380	756	203
Consumer [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Beginning balance	352	481	306
Provision for loan losses	99	(104)	341
Charge-offs	(95)	(100)	(211)
Recoveries	65	75	45
Net (charge-offs) recoveries	(30)	(25)	(166)
Ending balance	421	352	481
Unallocated [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Beginning balance	802	620	129
Provision for loan losses	(55)	182	491
Ending balance	$ 747	$ 802	$ 620

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 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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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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Amount of expense related to estimated loss from loan and lease transactions.

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