Investment Securities (Details 2) $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2018 USD ($) Investment	Dec. 31, 2017 USD ($) Investment
Available for sale
Available for sale Securities, Less than 12 months, Number of investments | Investment	29	25
Available for sale Securities, Less than 12 months, Fair value	$ 30,065	$ 27,846
Available for sale Securities, Less than 12 months, Unrealized losses	$ 707	$ 245
Available for sale Securities, 12 months or longer, Number of investments | Investment	27	28
Available for sale Securities, 12 months or longer, Fair value	$ 24,912	$ 27,511
Available for sale Securities, 12 months or Longer, Unrealized losses	$ 847	$ 518
Available for sale Securities, Total, Number of investments | Investment	56	53
Available for sale Securities, Total, Fair value	$ 54,977	$ 55,357
Available for sale Securities, Total, Unrealized losses	$ 1,554	$ 763
US government agencies [Member]
Available for sale
Available for sale Securities, Less than 12 months, Number of investments | Investment	5	5
Available for sale Securities, Less than 12 months, Fair value	$ 4,121	$ 4,184
Available for sale Securities, Less than 12 months, Unrealized losses	$ 85	$ 22
Available for sale Securities, 12 months or longer, Number of investments | Investment	3	4
Available for sale Securities, 12 months or longer, Fair value	$ 2,908	$ 3,968
Available for sale Securities, 12 months or Longer, Unrealized losses	$ 129	$ 75
Available for sale Securities, Total, Number of investments | Investment	8	9
Available for sale Securities, Total, Fair value	$ 7,029	$ 8,152
Available for sale Securities, Total, Unrealized losses	$ 214	$ 97
SBA securities [Member]
Available for sale
Available for sale Securities, Less than 12 months, Number of investments | Investment	1	1
Available for sale Securities, Less than 12 months, Fair value	$ 2,781	$ 2,936
Available for sale Securities, Less than 12 months, Unrealized losses	$ 84	$ 13
Available for sale Securities, 12 months or longer, Number of investments | Investment	1	1
Available for sale Securities, 12 months or longer, Fair value	$ 1,044	$ 1,127
Available for sale Securities, 12 months or Longer, Unrealized losses	$ 16	$ 11
Available for sale Securities, Total, Number of investments | Investment	2	2
Available for sale Securities, Total, Fair value	$ 3,825	$ 4,063
Available for sale Securities, Total, Unrealized losses	$ 100	$ 24
State and political subdivisions [Member]
Available for sale
Available for sale Securities, Less than 12 months, Number of investments | Investment	6	3
Available for sale Securities, Less than 12 months, Fair value	$ 2,618	$ 1,214
Available for sale Securities, Less than 12 months, Unrealized losses	$ 57	$ 9
Available for sale Securities, 12 months or longer, Number of investments | Investment	2	2
Available for sale Securities, 12 months or longer, Fair value	$ 769	$ 792
Available for sale Securities, 12 months or Longer, Unrealized losses	$ 37	$ 16
Available for sale Securities, Total, Number of investments | Investment	8	5
Available for sale Securities, Total, Fair value	$ 3,387	$ 2,006
Available for sale Securities, Total, Unrealized losses	$ 94	$ 25
Mortgage-backed securities [Member] | FHLMC [Member]
Available for sale
Available for sale Securities, Less than 12 months, Number of investments | Investment	3	3
Available for sale Securities, Less than 12 months, Fair value	$ 2,740	$ 2,897
Available for sale Securities, Less than 12 months, Unrealized losses	$ 75	$ 26
Available for sale Securities, 12 months or longer, Number of investments | Investment	7	7
Available for sale Securities, 12 months or longer, Fair value	$ 5,736	$ 6,056
Available for sale Securities, 12 months or Longer, Unrealized losses	$ 220	$ 123
Available for sale Securities, Total, Number of investments | Investment	10	10
Available for sale Securities, Total, Fair value	$ 8,476	$ 8,953
Available for sale Securities, Total, Unrealized losses	$ 295	$ 149
Mortgage-backed securities [Member] | FNMA [Member]
Available for sale
Available for sale Securities, Less than 12 months, Number of investments | Investment	11	11
Available for sale Securities, Less than 12 months, Fair value	$ 13,412	$ 14,345
Available for sale Securities, Less than 12 months, Unrealized losses	$ 314	$ 135
Available for sale Securities, 12 months or longer, Number of investments | Investment	13	13
Available for sale Securities, 12 months or longer, Fair value	$ 13,639	$ 14,597
Available for sale Securities, 12 months or Longer, Unrealized losses	$ 388	$ 251
Available for sale Securities, Total, Number of investments | Investment	24	24
Available for sale Securities, Total, Fair value	$ 27,051	$ 28,942
Available for sale Securities, Total, Unrealized losses	$ 702	$ 386
Mortgage-backed securities [Member] | GNMA [Member]
Available for sale
Available for sale Securities, Less than 12 months, Number of investments | Investment	3	2
Available for sale Securities, Less than 12 months, Fair value	$ 4,393	$ 2,270
Available for sale Securities, Less than 12 months, Unrealized losses	$ 92	$ 40
Available for sale Securities, 12 months or longer, Number of investments | Investment	1	1
Available for sale Securities, 12 months or longer, Fair value	$ 816	$ 971
Available for sale Securities, 12 months or Longer, Unrealized losses	$ 57	$ 42
Available for sale Securities, Total, Number of investments | Investment	4	3
Available for sale Securities, Total, Fair value	$ 5,209	$ 3,241
Available for sale Securities, Total, Unrealized losses	$ 149	$ 82