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Loans and Allowance for Loan Losses - Summary of Major Classifications of Loans (Details) - USD ($) $ in Thousands		Sep. 30, 2021	Dec. 31, 2020	Dec. 31, 2019
Loans And Leases Receivable Disclosure [Line Items]
Total loans, gross		$ 571,170	$ 598,615
Less allowance for loan losses		(7,631)	(6,361)	$ (4,134)
Total loans, net		563,539	592,254
Commercial (Secured by Real Estate)
Loans And Leases Receivable Disclosure [Line Items]
Total loans, gross		207,018	178,571
Less allowance for loan losses		(3,665)	(3,084)	(1,661)
Commercial and Industrial
Loans And Leases Receivable Disclosure [Line Items]
Total loans, gross		170,123	155,554
Paycheck Protection Program Loans
Loans And Leases Receivable Disclosure [Line Items]
Total loans, gross	[1]	31,715	101,749
Less allowance for loan losses		0	0
Construction, Land and Acquisition & Development
Loans And Leases Receivable Disclosure [Line Items]
Total loans, gross		21,713	23,571
Less allowance for loan losses		(182)	(224)	(153)
Residential Mortgage 1-4 Family
Loans And Leases Receivable Disclosure [Line Items]
Total loans, gross		73,532	91,777
Consumer Installment
Loans And Leases Receivable Disclosure [Line Items]
Total loans, gross		67,069	47,393
Less allowance for loan losses		$ (762)	$ (719)	$ (466)
[1] Includes PPP loans that are fully guaranteed by the SBA; thus no allowance for loan losses has been allocated to these loans.

X

- 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.

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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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Amount after allowance and deduction of deferred interest and fees, unamortized costs and premiums and discounts from face amounts, of loans and leases held in portfolio, including but not limited to, commercial and consumer loans. Excludes loans and leases covered under loss sharing agreements and loans held for sale.

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