Loans - Schedule of Allowances for Loan Losses by Portfolio Segment (Detail) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Financing Receivable, Allowance for Credit Losses [Line Items]
Beginning balance	$ 7,875	$ 7,835	$ 8,274	$ 7,017
(RECOVERY OF) PROVISION FOR LOAN LOSSES	(210)	377	(655)	1,272
Charge-offs	(39)	(28)	(64)	(131)
Recoveries	19	171	90	197
Net (charge-offs) recoveries	(20)	143	26	66
Ending balance	7,645	8,355	7,645	8,355
Commercial [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Beginning balance	1,335	2,266	1,739	2,408
(RECOVERY OF) PROVISION FOR LOAN LOSSES	9	(512)	(393)	(643)
Charge-offs		(26)	(25)	(45)
Recoveries	5	118	28	126
Net (charge-offs) recoveries	5	92	3	81
Ending balance	1,349	1,846	1,349	1,846
Commercial Real Estate [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Beginning balance	3,404	2,781	3,469	2,153
(RECOVERY OF) PROVISION FOR LOAN LOSSES	(280)	500	(346)	1,127
Recoveries		40	1	41
Net (charge-offs) recoveries		40	1	41
Ending balance	3,124	3,321	3,124	3,321
Residential Real Estate [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Beginning balance	1,060	1,585	1,156	1,152
(RECOVERY OF) PROVISION FOR LOAN LOSSES	(32)	(390)	(130)	56
Charge-offs				(15)
Recoveries	2	1	4	3
Net (charge-offs) recoveries	2	1	4	(12)
Ending balance	1,030	1,196	1,030	1,196
Construction & Land Development [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Beginning balance	767	337	756	203
(RECOVERY OF) PROVISION FOR LOAN LOSSES	508	229	519	363
Ending balance	1,275	566	1,275	566
Consumer [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Beginning balance	278	516	352	481
(RECOVERY OF) PROVISION FOR LOAN LOSSES	(9)	(112)	(128)	(23)
Charge-offs	(39)	(2)	(39)	(71)
Recoveries	12	12	57	27
Net (charge-offs) recoveries	(27)	10	18	(44)
Ending balance	242	414	242	414
Unallocated [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Beginning balance	1,031	350	802	620
(RECOVERY OF) PROVISION FOR LOAN LOSSES	(406)	662	(177)	392
Ending balance	$ 625	$ 1,012	$ 625	$ 1,012

(Recovery) of provision for loan losses.

No definition available.

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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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-Publisher FASB
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- Definition

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

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-Publisher FASB
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- Definition

Amount of loans and leases that have been written off from both loan receivables and allowance reserve for credit loss.

+ References

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-Publisher FASB
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+ References

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- Definition

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.

+ References

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