Deposits (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Summary of interest-bearing deposits:
Demand	$ 50,410	$ 45,158
Money market	171,783	133,783
Savings	113,078	112,817
Time:
In denominations $250,000 or under	108,761	113,368
In denominations of over $250,000	18,528	17,499
Interest bearing deposits total	$ 462,560	$ 422,625