Loans - Troubled Debt Restructuring (Details) $ in Thousands	3 Months Ended		6 Months Ended		12 Months Ended
	Dec. 31, 2020 USD ($)	Dec. 31, 2019 USD ($)	Dec. 31, 2020 USD ($) loan	Dec. 31, 2019 USD ($)	Jun. 30, 2020 USD ($) loan
Financing Receivable, Impaired [Line Items]
Troubled debt restructuring	$ 1,300	$ 1,400	$ 1,300	$ 1,400
Interest income on accruing TDR	18	18	35	35
Impairment on TDR	47	$ 43	95	$ 86
Total Loans	501,909		$ 501,909		$ 517,467
Number of contracts | loan			0		0
Small Business Administration, CARES Act, Monetary Relief [Member]
Financing Receivable, Impaired [Line Items]
Amount of loans modified into PPP					$ 49,800
Small Business Administration, CARES Act, Monetary Relief [Member] | Payment Deferral
Financing Receivable, Impaired [Line Items]
Period of principal and interest deferment			3 months
Total Loans	3,000		$ 3,000
Acquired credit impaired
Financing Receivable, Impaired [Line Items]
Loans acquired	255		255
Residential real estate | 1-4 Family
Financing Receivable, Impaired [Line Items]
Total Loans	325,728		325,728		345,915
Residential real estate | Home equity and HELOCs
Financing Receivable, Impaired [Line Items]
Total Loans	45,093		45,093		47,054
Residential real estate | Construction Residential
Financing Receivable, Impaired [Line Items]
Total Loans	13,581		13,581		15,799
Commercial real estate | Multi-family
Financing Receivable, Impaired [Line Items]
Total Loans	12,223		12,223		14,964
Commercial real estate | Commercial non-residential
Financing Receivable, Impaired [Line Items]
Total Loans	89,952		89,952		76,707
Commercial real estate | Construction and Land
Financing Receivable, Impaired [Line Items]
Total Loans	5,818		5,818		6,690
Commercial
Financing Receivable, Impaired [Line Items]
Total Loans	6,027		6,027		6,438
Consumer
Financing Receivable, Impaired [Line Items]
Total Loans	$ 3,487		$ 3,487		$ 3,900