Loans Past Due Loans (Details) - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019
Financing Receivable, Past Due [Line Items]
Current	$ 760,027	$ 661,111
Nonaccrual	2,451	2,323
Total	766,050	670,244
30-59 Days
Financing Receivable, Past Due [Line Items]
Past due	1,421	4,147
60-89 Days
Financing Receivable, Past Due [Line Items]
Past due	1,187	1,484
90 Days and Over and Accruing
Financing Receivable, Past Due [Line Items]
Past due	964	1,179
Residential real estate
Financing Receivable, Past Due [Line Items]
Current	180,973	187,022
Nonaccrual	649	272
Total	182,935	192,125
Residential real estate | 30-59 Days
Financing Receivable, Past Due [Line Items]
Past due	542	2,716
Residential real estate | 60-89 Days
Financing Receivable, Past Due [Line Items]
Past due	251	1,304
Residential real estate | 90 Days and Over and Accruing
Financing Receivable, Past Due [Line Items]
Past due	520	811
Construction real estate
Financing Receivable, Past Due [Line Items]
Current	48,337	68,731
Nonaccrual	22	29
Total	49,668	69,617
Construction real estate | 30-59 Days
Financing Receivable, Past Due [Line Items]
Past due	865	470
Construction real estate | 60-89 Days
Financing Receivable, Past Due [Line Items]
Past due	0	19
Construction real estate | 90 Days and Over and Accruing
Financing Receivable, Past Due [Line Items]
Past due	444	368
Commercial real estate
Financing Receivable, Past Due [Line Items]
Current	315,296	286,795
Nonaccrual	1,765	1,998
Total	317,985	289,883
Commercial real estate | 30-59 Days
Financing Receivable, Past Due [Line Items]
Past due	0	940
Commercial real estate | 60-89 Days
Financing Receivable, Past Due [Line Items]
Past due	924	150
Commercial real estate | 90 Days and Over and Accruing
Financing Receivable, Past Due [Line Items]
Past due	0	0
Commercial
Financing Receivable, Past Due [Line Items]
Current	114,843	47,673
Nonaccrual	15	21
Total	114,868	47,699
Commercial | 30-59 Days
Financing Receivable, Past Due [Line Items]
Past due	3	0
Commercial | 60-89 Days
Financing Receivable, Past Due [Line Items]
Past due	7	5
Commercial | 90 Days and Over and Accruing
Financing Receivable, Past Due [Line Items]
Past due	0	0
Consumer
Financing Receivable, Past Due [Line Items]
Current	2,817	3,532
Nonaccrual	0	3
Total	2,833	3,562
Consumer | 30-59 Days
Financing Receivable, Past Due [Line Items]
Past due	11	21
Consumer | 60-89 Days
Financing Receivable, Past Due [Line Items]
Past due	5	6
Consumer | 90 Days and Over and Accruing
Financing Receivable, Past Due [Line Items]
Past due	0	0
Municipal
Financing Receivable, Past Due [Line Items]
Current	97,761	67,358
Nonaccrual	0	0
Total	97,761	67,358
Municipal | 30-59 Days
Financing Receivable, Past Due [Line Items]
Past due	0	0
Municipal | 60-89 Days
Financing Receivable, Past Due [Line Items]
Past due	0	0
Municipal | 90 Days and Over and Accruing
Financing Receivable, Past Due [Line Items]
Past due	$ 0	$ 0