Premises and Equipment (Details)	12 Months Ended
	Dec. 31, 2017 USD ($) Location Branch	Dec. 31, 2016 USD ($)
Premises and equipment [Abstract]
Total, at cost	$ 36,390,000	$ 36,002,000
Less: Accumulated depreciation and amortization	(13,251,000)	(11,972,000)
Net premises and equipment	23,139,000	24,030,000
Depreciation expense	$ 1,200,000	1,200,000
Period of second lease term	25 years
Minimum future lease payments [Abstract]
2018	$ 225,000
2019	225,000
2020	185,000
2021	135,000
2022	115,000
Thereafter	417,000
Total	1,302,000
Minimum future rental income [Abstract]
2018	1,006,000
2019	1,006,000
2020	767,000
2021	515,000
2022	244,000
Thereafter	244,000
Total	3,782,000
Rent expense	246,000	175,000
Total gross rental income	$ 994,000	1,000,000
Anne Arundel County, Maryland [Member]
Premises and equipment [Abstract]
Number of retail branch locations | Location	5
Number of retail branch owned | Branch	3
Number of retail branch locations leased | Location	2
Lease expiration date	Jul. 31, 2020
Second lease expiration date	Feb. 28, 2026
Annapolis, Maryland [Member]
Premises and equipment [Abstract]
Lease expiration date	Jan. 31, 2017
Second lease renewal term	5 years
Minimum [Member] | Annapolis, Maryland [Member]
Premises and equipment [Abstract]
Period for which lease term renewed	3 years
Maximum [Member] | Annapolis, Maryland [Member]
Premises and equipment [Abstract]
Period for which lease term renewed	5 years
Land [Member]
Premises and equipment [Abstract]
Total, at cost	$ 1,537,000	1,537,000
Building [Member]
Premises and equipment [Abstract]
Total, at cost	29,500,000	29,545,000
Leasehold Improvements [Member]
Premises and equipment [Abstract]
Total, at cost	2,485,000	2,202,000
Furniture, Fixtures and Equipment [Member]
Premises and equipment [Abstract]
Total, at cost	$ 2,868,000	$ 2,718,000