Loans Past Due Loans (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Financing Receivable, Past Due [Line Items]
Loans, current	$ 764,499	$ 661,111
Loans, nonaccrual	2,410	2,323
Loans	771,169	670,244
30-59 Days
Financing Receivable, Past Due [Line Items]
Loans, past due	3,471	4,147
60-89 Days
Financing Receivable, Past Due [Line Items]
Loans, past due	278	1,484
90 Days and over and accruing
Financing Receivable, Past Due [Line Items]
Loans, past due	511	1,179
Residential loans
Financing Receivable, Past Due [Line Items]
Loans, current	179,794	187,022
Loans, nonaccrual	627	272
Loans	183,166	192,125
Residential loans | 30-59 Days
Financing Receivable, Past Due [Line Items]
Loans, past due	2,166	2,716
Residential loans | 60-89 Days
Financing Receivable, Past Due [Line Items]
Loans, past due	211	1,304
Residential loans | 90 Days and over and accruing
Financing Receivable, Past Due [Line Items]
Loans, past due	368	811
Construction real estate
Financing Receivable, Past Due [Line Items]
Loans, current	57,116	68,731
Loans, nonaccrual	21	29
Loans	57,417	69,617
Construction real estate | 30-59 Days
Financing Receivable, Past Due [Line Items]
Loans, past due	70	470
Construction real estate | 60-89 Days
Financing Receivable, Past Due [Line Items]
Loans, past due	67	19
Construction real estate | 90 Days and over and accruing
Financing Receivable, Past Due [Line Items]
Loans, past due	143	368
Commercial real estate
Financing Receivable, Past Due [Line Items]
Loans, current	317,748	286,795
Loans, nonaccrual	1,749	1,998
Loans	320,627	289,883
Commercial real estate | 30-59 Days
Financing Receivable, Past Due [Line Items]
Loans, past due	1,130	940
Commercial real estate | 60-89 Days
Financing Receivable, Past Due [Line Items]
Loans, past due	0	150
Commercial real estate | 90 Days and over and accruing
Financing Receivable, Past Due [Line Items]
Loans, past due	0	0
Commercial loans
Financing Receivable, Past Due [Line Items]
Loans, current	108,749	47,673
Loans, nonaccrual	13	21
Loans	108,861	47,699
Commercial loans | 30-59 Days
Financing Receivable, Past Due [Line Items]
Loans, past due	99	0
Commercial loans | 60-89 Days
Financing Receivable, Past Due [Line Items]
Loans, past due	0	5
Commercial loans | 90 Days and over and accruing
Financing Receivable, Past Due [Line Items]
Loans, past due	0	0
Consumer
Financing Receivable, Past Due [Line Items]
Loans, current	2,595	3,532
Loans, nonaccrual	0	3
Loans	2,601	3,562
Consumer | 30-59 Days
Financing Receivable, Past Due [Line Items]
Loans, past due	6	21
Consumer | 60-89 Days
Financing Receivable, Past Due [Line Items]
Loans, past due	0	6
Consumer | 90 Days and over and accruing
Financing Receivable, Past Due [Line Items]
Loans, past due	0	0
Municipal
Financing Receivable, Past Due [Line Items]
Loans, current	98,497	67,358
Loans, nonaccrual	0	0
Loans	98,497	67,358
Municipal | 30-59 Days
Financing Receivable, Past Due [Line Items]
Loans, past due	0	0
Municipal | 60-89 Days
Financing Receivable, Past Due [Line Items]
Loans, past due	0	0
Municipal | 90 Days and over and accruing
Financing Receivable, Past Due [Line Items]
Loans, past due	$ 0	$ 0