Loans TDRs by Class and Specific Reserve (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2019 USD ($) loan	Dec. 31, 2018 USD ($) loan
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of Loans | loan	81	76
Balance	$ 21,424	$ 25,222
Specific Reserves	$ 1,677	$ 1,568
Commercial | Real Estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of Loans | loan	17	17
Balance	$ 4,836	$ 8,631
Specific Reserves	$ 246	$ 132
Commercial | Construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of Loans | loan	1	1
Balance	$ 701	$ 721
Specific Reserves	$ 0	$ 0
Commercial | Other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of Loans | loan	8	10
Balance	$ 6,932	$ 7,298
Specific Reserves	$ 1,231	$ 1,276
Municipal
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of Loans | loan	0	0
Balance	$ 0	$ 0
Specific Reserves	$ 0	$ 0
Residential | Construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of Loans | loan	0	0
Balance	$ 0	$ 0
Specific Reserves	$ 0	$ 0
Residential | Term
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of Loans | loan	52	45
Balance	$ 8,472	$ 8,074
Specific Reserves	$ 200	$ 160
Home Equity LIne of Credit
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of Loans | loan	3	3
Balance	$ 483	$ 498
Specific Reserves	$ 0	$ 0
Consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of Loans | loan	0	0
Balance	$ 0	$ 0
Specific Reserves	$ 0	$ 0