Loans Composition of Net Loans (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	$ 771,169	$ 670,244
Allowance for loan losses	(8,271)	(6,122)	$ (5,739)
Net deferred loan (fees) costs	(146)	1,043
Net loans	762,752	665,165
Residential loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	183,166	192,125
Allowance for loan losses	(1,776)	(1,392)	(1,368)
Construction real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	57,417	69,617
Allowance for loan losses	(763)	(774)	(617)
Commercial real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	320,627	289,883
Allowance for loan losses	(4,199)	(3,178)	(2,933)
Commercial loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	108,861	47,699
Allowance for loan losses	(458)	(394)	(354)
Consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	2,601	3,562
Allowance for loan losses	(15)	(23)	(23)
Municipal
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	98,497	67,358
Allowance for loan losses	$ (214)	$ (76)	$ (82)