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Loans - TDR's by Class and Specific Reserves (Details) $ in Thousands	6 Months Ended		12 Months Ended
	Jun. 30, 2020 USD ($) loan	Jun. 30, 2019 USD ($) loan	Dec. 31, 2019 USD ($) loan
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of Loans | loan	78	83	81
Balance	$ 14,013	$ 24,454	$ 21,424
Specific Reserves	$ 543	$ 1,691	$ 1,677
Commercial |    Real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of Loans | loan	16	19	17
Balance	$ 4,585	$ 7,624	$ 4,836
Specific Reserves	$ 194	$ 192	$ 246
Commercial |    Construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of Loans | loan	1	1	1
Balance	$ 701	$ 721	$ 701
Specific Reserves	$ 20	$ 0	$ 0
Commercial |    Other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of Loans | loan	7	9	8
Balance	$ 777	$ 7,185	$ 6,932
Specific Reserves	$ 131	$ 1,275	$ 1,231
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	51	51	52
Balance	$ 7,477	$ 8,433	$ 8,472
Specific Reserves	$ 198	$ 224	$ 200
Home equity line of credit
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of Loans | loan	3	3	3
Balance	$ 473	$ 491	$ 483
Specific Reserves	$ 0	$ 0	$ 0
Consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of Loans | loan	0	0	0
Balance	$ 0	$ 0	$ 0
Specific Reserves	$ 0	$ 0	$ 0

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+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
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