Regulatory Capital Requirements - Actual and Statutory Required Capital Amounts and Ratios (Detail) - USD ($) $ in Thousands	Sep. 30, 2016	Dec. 31, 2015
Home Savings [Member]
Compliance With Regulatory Capital Requirements Under Banking Regulations [Line Items]
Risk-based capital, Actual Amount	$ 253,440	$ 240,697
Tier 1 capital to risk-weighted assets, Actual Amount	235,230	224,486
Common equity Tier 1 capital to risk-weighted assets, Actual Amount	235,230	224,486
Tier 1 capital to average total assets, Actual Amount	$ 235,230	$ 224,486
Total risk-based capital to risk-weighted assets, Actual Ratio	17.21%	18.72%
Tier 1 capital to risk-weighted assets, Actual Ratio	15.97%	17.46%
Common equity Tier 1 capital to risk-weighted assets, Actual Ratio	15.97%	17.46%
Tier 1 capital to average total assets, Actual Ratio	11.28%	11.46%
Total risk-based capital to risk-weighted assets, Minimum Capital Amount	$ 127,008	$ 102,879
Tier 1 capital to risk-weighted assets, Minimum Capital Amount	97,557	77,159
Common equity Tier 1 capital to risk-weighted assets, Minimum Capital Amount	75,468	57,869
Tier 1 capital to average total assets, Minimum Capital Amount	$ 83,421	$ 78,347
Total risk-based capital to risk-weighted assets, Minimum Capital Ratio	8.625%	8.00%
Tier 1 capital to risk-weighted assets, Minimum Capital Ratio	6.625%	6.00%
Common equity Tier 1 capital to risk-weighted assets, Minimum Capital Ratio	5.125%	4.50%
Tier 1 capital to average total assets, Minimum Capital Ratio	4.00%	4.00%
Total risk-based capital to risk-weighted assets, To Be Well Capitalized Amount	$ 147,255	$ 128,599
Tier 1 capital to risk-weighted assets, To Be Well Capitalized Amount	117,804	102,879
Common equity Tier 1 capital to risk-weighted assets, To Be Well Capitalized Amount	95,716	83,589
Tier 1 capital to average total assets, To Be Well Capitalized Amount	$ 104,276	$ 97,934
Total risk-based capital to risk-weighted assets, To Be Well Capitalized Ratio	10.00%	10.00%
Tier 1 capital to risk-weighted assets, To Be Well Capitalized Ratio	8.00%	8.00%
Common equity Tier 1 capital to risk-weighted assets, To Be Well Capitalized Ratio	6.50%	6.50%
Tier 1 capital to average total assets, To Be Well Capitalized Ratio	5.00%	5.00%
United Community [Member]
Compliance With Regulatory Capital Requirements Under Banking Regulations [Line Items]
Risk-based capital, Actual Amount	$ 271,115	$ 261,732
Tier 1 capital to risk-weighted assets, Actual Amount	252,881	245,503
Common equity Tier 1 capital to risk-weighted assets, Actual Amount	252,881	245,503
Tier 1 capital to average total assets, Actual Amount	$ 252,881	$ 245,503
Total risk-based capital to risk-weighted assets, Actual Ratio	18.39%	20.35%
Tier 1 capital to risk-weighted assets, Actual Ratio	17.15%	19.09%
Common equity Tier 1 capital to risk-weighted assets, Actual Ratio	17.15%	19.09%
Tier 1 capital to average total assets, Actual Ratio	12.12%	12.53%
Total risk-based capital to risk-weighted assets, Minimum Capital Amount	$ 127,163	$ 102,886
Tier 1 capital to risk-weighted assets, Minimum Capital Amount	97,676	77,165
Common equity Tier 1 capital to risk-weighted assets, Minimum Capital Amount	75,560	57,874
Tier 1 capital to average total assets, Minimum Capital Amount	$ 83,475	$ 78,348
Total risk-based capital to risk-weighted assets, Minimum Capital Ratio	8.625%	8.00%
Tier 1 capital to risk-weighted assets, Minimum Capital Ratio	6.625%	6.00%
Common equity Tier 1 capital to risk-weighted assets, Minimum Capital Ratio	5.125%	4.50%
Tier 1 capital to average total assets, Minimum Capital Ratio	4.00%	4.00%
Total risk-based capital to risk-weighted assets, To Be Well Capitalized Amount	$ 147,435	$ 128,608
Tier 1 capital to risk-weighted assets, To Be Well Capitalized Amount	117,948	102,886
Common equity Tier 1 capital to risk-weighted assets, To Be Well Capitalized Amount	95,833	83,595
Tier 1 capital to average total assets, To Be Well Capitalized Amount	$ 104,344	$ 97,934
Total risk-based capital to risk-weighted assets, To Be Well Capitalized Ratio	10.00%	10.00%
Tier 1 capital to risk-weighted assets, To Be Well Capitalized Ratio	8.00%	8.00%
Common equity Tier 1 capital to risk-weighted assets, To Be Well Capitalized Ratio	6.50%	6.50%
Tier 1 capital to average total assets, To Be Well Capitalized Ratio	5.00%	5.00%