Loans Past Due Loans (Details) - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019
Financing Receivable, Past Due [Line Items]
Loans, Current	$ 667,345	$ 661,111
Loans, Nonaccrual	2,209	2,323
Loans	676,531	670,244
30 - 59 Days [Member]
Financing Receivable, Past Due [Line Items]
Loans, Past Due	5,215	4,147
60 - 89 Days [Member]
Financing Receivable, Past Due [Line Items]
Loans, Past Due	40	1,484
90 Days and Over and Accruing [Member]
Financing Receivable, Past Due [Line Items]
Loans, Past Due	1,722	1,179
Residential Real Estate [Member]
Financing Receivable, Past Due [Line Items]
Loans, Current	185,549	187,022
Loans, Nonaccrual	298	272
Loans	190,420	192,125
Residential Real Estate [Member] | 30 - 59 Days [Member]
Financing Receivable, Past Due [Line Items]
Loans, Past Due	3,305	2,716
Residential Real Estate [Member] | 60 - 89 Days [Member]
Financing Receivable, Past Due [Line Items]
Loans, Past Due	35	1,304
Residential Real Estate [Member] | 90 Days and Over and Accruing [Member]
Financing Receivable, Past Due [Line Items]
Loans, Past Due	1,233	811
Construction Real Estate [Member]
Financing Receivable, Past Due [Line Items]
Loans, Current	53,550	68,731
Loans, Nonaccrual	25	29
Loans	54,207	69,617
Construction Real Estate [Member] | 30 - 59 Days [Member]
Financing Receivable, Past Due [Line Items]
Loans, Past Due	263	470
Construction Real Estate [Member] | 60 - 89 Days [Member]
Financing Receivable, Past Due [Line Items]
Loans, Past Due	0	19
Construction Real Estate [Member] | 90 Days and Over and Accruing [Member]
Financing Receivable, Past Due [Line Items]
Loans, Past Due	369	368
Commercial Real Estate [Member]
Financing Receivable, Past Due [Line Items]
Loans, Current	300,689	286,795
Loans, Nonaccrual	1,866	1,998
Loans	304,204	289,883
Commercial Real Estate [Member] | 30 - 59 Days [Member]
Financing Receivable, Past Due [Line Items]
Loans, Past Due	1,576	940
Commercial Real Estate [Member] | 60 - 89 Days [Member]
Financing Receivable, Past Due [Line Items]
Loans, Past Due	0	150
Commercial Real Estate [Member] | 90 Days and Over and Accruing [Member]
Financing Receivable, Past Due [Line Items]
Loans, Past Due	73	0
Commercial [Member]
Financing Receivable, Past Due [Line Items]
Loans, Current	47,541	47,673
Loans, Nonaccrual	18	21
Loans	47,633	47,699
Commercial [Member] | 30 - 59 Days [Member]
Financing Receivable, Past Due [Line Items]
Loans, Past Due	29	0
Commercial [Member] | 60 - 89 Days [Member]
Financing Receivable, Past Due [Line Items]
Loans, Past Due	0	5
Commercial [Member] | 90 Days and Over and Accruing [Member]
Financing Receivable, Past Due [Line Items]
Loans, Past Due	45	0
Consumer [Member]
Financing Receivable, Past Due [Line Items]
Loans, Current	3,445	3,532
Loans, Nonaccrual	2	3
Loans	3,460	3,562
Consumer [Member] | 30 - 59 Days [Member]
Financing Receivable, Past Due [Line Items]
Loans, Past Due	6	21
Consumer [Member] | 60 - 89 Days [Member]
Financing Receivable, Past Due [Line Items]
Loans, Past Due	5	6
Consumer [Member] | 90 Days and Over and Accruing [Member]
Financing Receivable, Past Due [Line Items]
Loans, Past Due	2	0
Municipal [Member]
Financing Receivable, Past Due [Line Items]
Loans, Current	76,571	67,358
Loans, Nonaccrual	0	0
Loans	76,607	67,358
Municipal [Member] | 30 - 59 Days [Member]
Financing Receivable, Past Due [Line Items]
Loans, Past Due	36	0
Municipal [Member] | 60 - 89 Days [Member]
Financing Receivable, Past Due [Line Items]
Loans, Past Due	0	0
Municipal [Member] | 90 Days and Over and Accruing [Member]
Financing Receivable, Past Due [Line Items]
Loans, Past Due	$ 0	$ 0