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Loans - TDR's by Class and Specific Reserves (Details) $ in Thousands	9 Months Ended		12 Months Ended
	Sep. 30, 2021 USD ($) loan	Sep. 30, 2020 USD ($) loan	Dec. 31, 2020 USD ($) loan
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of Loans | loan	64	78	74
Balance	$ 10,051	$ 13,390	$ 11,534
Specific Reserves	$ 636	$ 395	$ 369
Commercial |    Real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of Loans | loan	10	16	13
Balance	$ 2,238	$ 4,054	$ 2,558
Specific Reserves	$ 138	$ 130	$ 106
Commercial |    Construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of Loans | loan	1	1	1
Balance	$ 681	$ 701	$ 681
Specific Reserves	$ 18	$ 19	$ 18
Commercial |    Other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of Loans | loan	6	6	6
Balance	$ 883	$ 729	$ 717
Specific Reserves	$ 351	$ 92	$ 96
Municipal
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of Loans | loan	0	0	0
Balance	$ 0	$ 0	$ 0
Specific Reserves	$ 0	$ 0	$ 0
Residential |    Construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of Loans | loan	0	0	0
Balance	$ 0	$ 0	$ 0
Specific Reserves	$ 0	$ 0	$ 0
Residential |    Term
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of Loans | loan	45	51	51
Balance	$ 6,224	$ 7,430	$ 7,384
Specific Reserves	$ 129	$ 153	$ 149
Home equity line of credit
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of Loans | loan	1	3	2
Balance	$ 21	$ 466	$ 186
Specific Reserves	$ 0	$ 0	$ 0
Consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of Loans | loan	1	1	1
Balance	$ 4	$ 10	$ 8
Specific Reserves	$ 0	$ 1	$ 0

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- Definition

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+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 33
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-Name Accounting Standards Codification
-Topic 310
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-URI http://asc.fasb.org/extlink&oid=123577603&loc=SL6953676-111524

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