Regulatory Matters - Schedule of actual and required capital amounts and ratios (Details) - USD ($) $ in Thousands	Sep. 30, 2016	Dec. 31, 2015
Regulatory Matters
Tier-1 Leverage	$ 47,537	$ 46,028
Tier 1 Leverage, ratio (as a percent)	11.70%	11.56%
Common Equity Tier 1	$ 47,537	$ 46,028
Common Equity Tier 1, ratio (as a percent)	17.90%	19.45%
Tier 1	$ 47,537	$ 46,028
Tier 1, ratio (as a percent)	17.90%	19.45%
Total Capital	$ 50,873	$ 49,010
Total Capital, ratio (as a percent)	19.16%	20.71%
Leverage required for capital adequacy purposes	$ 16,250	$ 15,923
Leverage required for capital adequacy purposes, ratio (as a percent)	4.00%	4.00%
Common Equity Tier 1 required for capital adequacy purposes	$ 11,950	$ 10,650
Common Equity Tier 1 required for capital adequacy purposes, ratio (as a percent)	4.50%	4.50%
Tier 1 required for capital adequacy purposes	$ 15,933	$ 14,200
Tier 1 required for capital adequacy purposes, ratio (as a percent)	6.00%	6.00%
Total capital required for capital adequacy purposes	$ 21,244	$ 18,933
Total capital required for capital adequacy purposes, ratio (as a percent)	8.00%	8.00%