Loans - Allowances for Loan Losses and Ending Balances by Portfolio Segment and Impairment Method (Detail) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for loan losses individually evaluated for impairment	$ 222	$ 30
Allowance for loan losses collectively evaluated for impairment	7,396	8,244
Total ending allowance balance	7,618	8,274	$ 7,017	$ 5,907
Loans individually evaluated for impairment	1,955	6,332
Loans collectively evaluated for impairment	547,095	603,538
Total ending loans balance	549,050	609,870
Commercial [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for loan losses individually evaluated for impairment	208	4
Allowance for loan losses collectively evaluated for impairment	1,032	1,735
Total ending allowance balance	1,240	1,739	2,408	2,178
Loans individually evaluated for impairment	342	2,560
Loans collectively evaluated for impairment	123,591	188,980
Total ending loans balance	123,933	191,540
Commercial Real Estate [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for loan losses individually evaluated for impairment	9	20
Allowance for loan losses collectively evaluated for impairment	2,829	3,449
Total ending allowance balance	2,838	3,469	2,153	1,791
Loans individually evaluated for impairment	291	2,875
Loans collectively evaluated for impairment	194,463	184,346
Total ending loans balance	194,754	187,221
Residential Real Estate [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for loan losses individually evaluated for impairment	2	1
Allowance for loan losses collectively evaluated for impairment	990	1,155
Total ending allowance balance	992	1,156	1,152	1,245
Loans individually evaluated for impairment	856	756
Loans collectively evaluated for impairment	167,391	176,399
Total ending loans balance	168,247	177,155
Construction & Land Development [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for loan losses collectively evaluated for impairment	1,380	756
Total ending allowance balance	1,380	756	203	258
Loans individually evaluated for impairment	329
Loans collectively evaluated for impairment	45,713	36,038
Total ending loans balance	46,042	36,038
Consumer [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for loan losses individually evaluated for impairment	3	5
Allowance for loan losses collectively evaluated for impairment	418	347
Total ending allowance balance	421	352	481	306
Loans individually evaluated for impairment	137	141
Loans collectively evaluated for impairment	15,937	17,775
Total ending loans balance	16,074	17,916
Unallocated [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for loan losses collectively evaluated for impairment	747	802
Total ending allowance balance	$ 747	$ 802	$ 620	$ 129

The valuation allowance for financing receivables that are expected to be uncollectible that were collectively evaluated for impairment.

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Amount of valuation allowance for financing receivables that are expected to be uncollectible that were individually evaluated for impairment.

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The balance of financing receivables that were collectively evaluated for impairment.

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The balance of financing receivables that were individually evaluated for impairment.

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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 before allowance of loans and leases held in portfolio, including but not limited to, commercial and consumer loans. Includes deferred interest and fees, undisbursed portion of loan balance, unamortized costs and premiums and discounts from face amounts. Excludes loans and leases covered under loss sharing agreements.

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