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Debt instrument fee percentage.

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Financing receivable restructuring recorded investment with non accrual status.

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Interest income recorded.

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Number of companies borrowed PPP loan.

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Number of loans to small business.

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Percentage of loan portfolio.

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Contractual interest rate for funds borrowed, under the debt agreement.

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Loans and Allowance for Loan Losses - Additional Information (Details) $ in Thousands	9 Months Ended						12 Months Ended
	Sep. 30, 2021 USD ($) Loan Borrower	Sep. 30, 2021 USD ($) Loan Borrower	Sep. 30, 2021 USD ($) Loan Borrower	Sep. 30, 2021 USD ($) Loan Borrower	Sep. 30, 2021 USD ($) Loan Borrower Contract	Sep. 30, 2021 USD ($) Loan Borrower DebtSecurityNumber	Dec. 31, 2020 USD ($)	Dec. 31, 2020 USD ($)	Dec. 31, 2020 USD ($) Loan	Dec. 31, 2020 USD ($) Contract	Dec. 31, 2020 USD ($) DebtSecurityNumber	Sep. 30, 2020 USD ($)	Dec. 31, 2019 USD ($)
Debt Securities Heldtomaturity Allowance For Credit Loss [Line Items]
Loans Pledged as Collateral	$ 62,700	$ 62,700	$ 62,700	$ 62,700	$ 62,700	$ 62,700	$ 36,100	$ 36,100	$ 36,100	$ 36,100	$ 36,100
Loans and Leases Receivable, Related Parties, Ending Balance		300					400
Loans and Leases Receivable, Related Parties, Additions		0					0
Loans and Leases Receivable, Related Parties, Proceeds		100					500
Loans and Leases Receivable, Nonperforming, Nonaccrual of Interest	1,000	1,000	1,000	1,000	1,000	1,000	3,100	3,100	3,100	3,100	3,100
Financing Receivable, Troubled Debt Restructuring	100	100	100	100	100	100	100	100	100	100	100
Loans and Leases Receivable, Impaired, Interest Lost on Nonaccrual Loans		44					161
Interest Income Recorded	9	9	9	$ 9	9	$ 9	42	42	$ 42	42	$ 42
Number of loans				2		7			0		5
Financing Receivable, Restructuring Recorded Investment With Nonaccrual Status	6,500	6,500	6,500	$ 6,500	6,500	$ 6,500
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Acquired During Period, Cash Flows Expected to be Collected at Acquisition	0	0	0	0	$ 0	0	0	0	$ 0	$ 0	$ 0
Financing Receivable, Troubled Debt Restructuring, Subsequent Default, Number of Contracts \| Contract					0					0
Loans, allowance for loan losses	8,193	8,193	8,193	8,193	$ 8,193	8,193	7,470	7,470	7,470	$ 7,470	7,470	$ 7,185	$ 5,762
Restructured Loan Modified through Extended Maturity and Payment Schedule Modification [Member]
Debt Securities Heldtomaturity Allowance For Credit Loss [Line Items]
Financing Receivable, Restructuring Recorded Investment With Nonaccrual Status	500	500	500	500	500	500
Loans, allowance for loan losses	1	1	1	1	1	1	1	1	1	1	1
Minimum [Member]
Debt Securities Heldtomaturity Allowance For Credit Loss [Line Items]
Loans Modified in a Troubled Debt Restructuring, Individually Evaluated for Impairment, Principal Balance, Threshold	500	500	500	500	500	500
Minimum [Member] \| ALC [Member]
Debt Securities Heldtomaturity Allowance For Credit Loss [Line Items]
Loans and Leases Receivable, Nonperforming, Nonaccrual of Interest	$ 50	$ 50	$ 50	$ 50	$ 50	$ 50
Paycheck Protection Program [Member]
Debt Securities Heldtomaturity Allowance For Credit Loss [Line Items]
Loan, fixed interest rate	1.00%	1.00%	1.00%	1.00%	1.00%	1.00%
Loan, aggregate principal balance	$ 3,900	$ 3,900	$ 3,900	$ 3,900	$ 3,900	$ 3,900
Number of loans to small businesses \| Loan	77	77	77	77	77	77
Number of companies \| Borrower	194	194	194	194	194	194
Amortized loan fees		$ 398					161
Net deferred loan fee		$ 188
Paycheck Protection Program [Member] \| Minimum [Member]
Debt Securities Heldtomaturity Allowance For Credit Loss [Line Items]
Loan fee percentage	1.00%	1.00%	1.00%	1.00%	1.00%	1.00%
Paycheck Protection Program [Member] \| Maximum [Member]
Debt Securities Heldtomaturity Allowance For Credit Loss [Line Items]
Loan fee percentage	5.00%	5.00%	5.00%	5.00%	5.00%	5.00%
Paycheck Protection Program [Member] \| Two Year Term Loan [Member]
Debt Securities Heldtomaturity Allowance For Credit Loss [Line Items]
Loan, aggregate principal balance	$ 200	$ 200	$ 200	$ 200	$ 200	$ 200
Loan payment term	two-year
Paycheck Protection Program [Member] \| Five Year Term Loan [Member]
Debt Securities Heldtomaturity Allowance For Credit Loss [Line Items]
Loan, aggregate principal balance	$ 3,700	3,700	3,700	3,700	3,700	3,700
Loan payment term	five-year
Financial Asset Acquired With Credit Deterioration [Member]
Debt Securities Heldtomaturity Allowance For Credit Loss [Line Items]
Amount Of Deferment Loan	$ 800	800	$ 800	$ 800	$ 800	$ 800	8,100	$ 8,100	$ 8,100	$ 8,100	$ 8,100
Deferred principal balance of loan reduced		$ 11,600					$ 13,500
Deferred principal balance of loan reduced percentage			1.60%					2.10%
Real Estate [Member]
Debt Securities Heldtomaturity Allowance For Credit Loss [Line Items]
Percentage of Loan Portfolio	53.80%	53.80%	53.80%	53.80%	53.80%	53.80%	56.10%	56.10%	56.10%	56.10%	56.10%