Regulatory Capital Requirements (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Company [Member]
Total capital to risk weighted assets
Total capital, actual	$ 60,800	$ 58,478
Total capital to risk weighted assets, actual	13.05%	13.42%
Total capital, for capital adequacy purposes	$ 37,272	$ 34,860
Total capital to risk weighted assets, for capital adequacy purposes	8.00%	8.00%
Tier I capital to risk weighted assets
Tier 1 capital, actual	$ 55,553	$ 53,277
Tier 1 capital to risk weighted assets, actual	11.93%	12.22%
Tier 1 capital, for capital adequacy purposes	$ 27,939	$ 26,159
Tier 1 capital to risk weighted assets, for capital adequacy purposes	6.00%	6.00%
Common Equity Tier 1 to risk weighted assets [Abstract]
Common Equity Tier 1 capital, actual	$ 55,553	$ 53,277
Common Equity Tier 1 capital to risk weighted assets, actual	11.93%	12.22%
Common Equity Tier 1 capital, for capital adequacy purposes	$ 20,955	$ 19,619
Common Equity Tier 1 capital to risk weighted assets, for capital adequacy purposes	4.50%	4.50%
Tier I capital to average assets
Tier 1 capital, actual	$ 55,553	$ 53,277
Tier 1 capital to average assets, actual	8.20%	8.54%
Tier 1 capital, for capital adequacy purposes	$ 27,099	$ 24,954
Tier 1 capital to average assets, for capital adequacy purposes	4.00%	4.00%
Union [Member]
Total capital to risk weighted assets
Total capital, actual	$ 60,528	$ 58,094
Total capital to risk weighted assets, actual	13.02%	13.37%
Total capital, for capital adequacy purposes	$ 37,191	$ 34,761
Total capital to risk weighted assets, for capital adequacy purposes	8.00%	8.00%
Total capital, to be well capitalized under prompt corrective action provisions	$ 46,488	$ 43,451
Total capital to risk weighted assets, to be well capitalized under prompt corrective action provisions	10.00%	10.00%
Tier I capital to risk weighted assets
Tier 1 capital, actual	$ 55,281	$ 52,893
Tier 1 capital to risk weighted assets, actual	11.89%	12.17%
Tier 1 capital, for capital adequacy purposes	$ 27,896	$ 26,077
Tier 1 capital to risk weighted assets, for capital adequacy purposes	6.00%	6.00%
Tier 1 capital, to be well capitalized under prompt corrective action provisions	$ 37,195	$ 34,769
Tier 1 capital to risk weighted assets, to be well capitalized under prompt corrective action provisions	8.00%	8.00%
Common Equity Tier 1 to risk weighted assets [Abstract]
Common Equity Tier 1 capital, actual	$ 55,281	$ 52,893
Common Equity Tier 1 capital to risk weighted assets, actual	11.89%	12.17%
Common Equity Tier 1 capital, for capital adequacy purposes	$ 20,922	$ 19,558
Common Equity Tier 1 capital to risk weighted assets, for capital adequacy purposes	4.50%	4.50%
Common Equity Tier 1 capital, to be well capitalized under prompt corrective action provisions	$ 30,221	$ 28,250
Common Equity Tier 1 capital to risk weighted assets, to be well capitalized under prompt corrective action provisions	6.50%	6.50%
Tier I capital to average assets
Tier 1 capital, actual	$ 55,281	$ 52,893
Tier 1 capital to average assets, actual	8.17%	8.50%
Tier 1 capital, for capital adequacy purposes	$ 27,065	$ 24,891
Tier 1 capital to average assets, for capital adequacy purposes	4.00%	4.00%
Tier 1 capital, to be well capitalized under prompt corrective action provisions	$ 33,832	$ 31,114
Tier 1 capital to average assets, to be well capitalized under prompt corrective action provisions	5.00%	5.00%