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Loans - TDR's by Class and Specific Reserves (Details) $ in Thousands	3 Months Ended		12 Months Ended
	Mar. 31, 2020 USD ($) loan	Mar. 31, 2019 USD ($) loan	Dec. 31, 2019 USD ($) loan
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of Loans | loan	81	80	81
Balance	$ 14,968	$ 25,386	$ 21,424
Specific Reserves	$ 556	$ 1,607	$ 1,677
Commercial | Real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of Loans | loan	16	17	17
Balance	$ 4,688	$ 8,583	$ 4,836
Specific Reserves	$ 225	$ 107	$ 246
Commercial | Construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of Loans | loan	1	1	1
Balance	$ 701	$ 721	$ 701
Specific Reserves	$ 3	$ 0	$ 0
Commercial | Other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of Loans | loan	7	10	8
Balance	$ 779	$ 7,257	$ 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	54	49	52
Balance	$ 8,321	$ 8,331	$ 8,472
Specific Reserves	$ 197	$ 225	$ 200
Home equity line of credit
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of Loans | loan	3	3	3
Balance	$ 479	$ 494	$ 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

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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-Topic 310
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-URI http://asc.fasb.org/extlink&oid=118936363&loc=SL6953676-111524

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