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Allowance for Loan Losses - Additional information (Details) - USD ($)	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Jun. 30, 2021	Dec. 31, 2020	Jun. 30, 2020	Dec. 31, 2019
Accounts, Notes, Loans and Financing Receivable [Line Items]
Provision expense for loan losses	$ 350,000	$ 675,000	$ 850,000	$ 1,300,000
Non-performing assets as a percent of loans	0.31%		0.31%		0.31%		0.34%
Allowance for Loan and Lease Losses Write-offs, Net			$ 71,000	$ 295,000
Allowance For Loan And Lease Losses Write Off Percentage			0.01%	0.04%
Increase in allowance for loan losses					$ 1,800,000
Percentage increase in the allowance balance					17.90%
Allowance for loan losses	$ 12,124,000	10,284,000	$ 12,124,000	$ 10,284,000	$ 12,124,000	$ 11,752,000	$ 11,345,000	$ 9,699,000	$ 9,279,000
Percentage Of Allowance For Non Performing Assets	389.00%		389.00%		389.00%		341.00%
Percentage Of Allowance For Total Loans	1.22%		1.22%		1.22%		1.16%
Financing Receivable, Individually Evaluated for Impairment	$ 2,206,000		$ 2,206,000		$ 2,206,000		$ 855,000
Provision recovery recorded	(350,000)	(675,000)	(850,000)	(1,300,000)
Increase in provision expense	250,000
Financing Receivable, Recorded Investment, Past Due	2,789,000		2,789,000		2,789,000		7,839,000
Non-performing
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	$ 3,100,000		$ 3,100,000		$ 3,100,000		$ 3,300,000
Non-performing assets as a percent of loans	0.31%		0.31%		0.31%		0.34%
Pass
Accounts, Notes, Loans and Financing Receivable [Line Items]
Minimum individual loan balance requiring quarterly review	$ 2,000,000		$ 2,000,000		$ 2,000,000
Special Mention
Accounts, Notes, Loans and Financing Receivable [Line Items]
Minimum individual loan balance requiring quarterly review	250,000		250,000		250,000
Substandard
Accounts, Notes, Loans and Financing Receivable [Line Items]
Minimum individual loan balance requiring quarterly review	250,000		250,000		250,000
Doubtful
Accounts, Notes, Loans and Financing Receivable [Line Items]
Minimum individual loan balance requiring quarterly review	100,000		100,000		100,000
Commercial | Commercial.
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses	3,124,000	3,036,000	3,124,000	3,036,000	3,124,000	$ 3,534,000	$ 3,472,000	$ 3,784,000	$ 3,951,000
Financing Receivable, Individually Evaluated for Impairment	2,200,000		2,200,000		2,200,000		847,000
Minimum aggregate balances for commercial loan relationship under structure loan rating process	1,000,000		1,000,000		1,000,000
Provision recovery recorded	445,000	$ 638,000	253,000	$ 805,000
Commercial | Commercial and Industrial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, Recorded Investment, Past Due	420,000		$ 420,000		420,000		$ 3,139,000
Commercial | Minimum | Commercial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Minimum percent of portfolio to be reviewed			36.00%
Consumer | Minimum | Consumer and Residential Mortgage Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, Individually Evaluated for Impairment	$ 150,000		$ 150,000		$ 150,000

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- Definition

The percentage of after recoveries, of loans and leases that have been written-off.

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