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Loans and Allowance for Loan Losses - Additional Information (Details)	9 Months Ended		12 Months Ended
	Sep. 30, 2021 USD ($) Contract Loan	Sep. 30, 2020 USD ($) Contract	Dec. 31, 2020 USD ($) Loan	Dec. 31, 2019 USD ($)
Financing Receivable Recorded Investment Past Due [Line Items]
Qualifying loans pledged to secure the line of credit from FHLB	$ 328,600,000		$ 309,900,000
Troubled debt restructurings that have subsequently defaulted, recorded investment	$ 0	$ 0
Troubled Debt Restructurings that have Subsequently Defaulted, Number of Contracts | Contract	1	0
Allowance for loan losses	$ 7,631,000		6,361,000	$ 4,134,000
Modified Loan Terms
Financing Receivable Recorded Investment Past Due [Line Items]
Allowance for loan losses	8,000		17,000
90 Days or Greater Past Due
Financing Receivable Recorded Investment Past Due [Line Items]
Total Past Due	$ 0		$ 0
Small Business Administration
Financing Receivable Recorded Investment Past Due [Line Items]
Number of paycheck protection program loans | Loan	730		1,171
Paycheck protection program loans	$ 66,100,000		$ 130,300,000

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Number of financing receivable contracts modified as troubled debt restructuring within previous 12 months, with subsequent payment default.

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Amount of financing receivable 90 days or more past due and still accruing.

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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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