Regulatory Capital Requirements - Actual and Statutory Required Capital Amounts and Ratios (Detail) - USD ($) $ in Thousands	Jun. 30, 2015	Dec. 31, 2014
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Compliance With Regulatory Capital Requirements Under Banking Regulations [Line Items]
Risk-based capital, Actual Amount	$ 237,890	$ 233,974
Tier 1 capital to risk-weighted assets, Actual Amount	222,593	220,080
Common equity Tier 1 capital to risk-weighted assets, Actual Amount	222,593
Tier 1 capital to average total assets, Actual Amount	$ 222,593	$ 220,080
Total risk-based capital to risk-weighted assets, Actual Ratio	19.69%	21.13%
Tier 1 capital to risk-weighted assets, Actual Ratio	18.42%	19.87%
Common equity Tier 1 capital to risk-weighted assets, Actual Ratio	18.42%
Tier 1 capital to average total assets, Actual Ratio	11.94%	12.11%
Total risk-based capital to risk-weighted assets, Minimum Capital Amount	$ 96,655	$ 88,602
Tier 1 capital to risk-weighted assets, Minimum Capital Amount	72,492
Common equity Tier 1 capital to risk-weighted assets, Minimum Capital Amount	54,369
Tier 1 capital to average total assets, Minimum Capital Amount	$ 74,542	$ 72,674
Total risk-based capital to risk-weighted assets, Minimum Capital Ratio	8.00%	8.00%
Tier 1 capital to risk-weighted assets, Minimum Capital Ratio	6.00%
Common equity Tier 1 capital to risk-weighted assets, Minimum Capital Ratio	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	$ 120,819	$ 110,752
Tier 1 capital to risk-weighted assets, To Be Well Capitalized Amount	96,655	66,451
Common equity Tier 1 capital to risk-weighted assets, To Be Well Capitalized Amount	78,532
Tier 1 capital to average total assets, To Be Well Capitalized Amount	$ 93,177	$ 90,843
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%	6.00%
Common equity Tier 1 capital to risk-weighted assets, To Be Well Capitalized Ratio	6.50%
Tier 1 capital to average total assets, To Be Well Capitalized Ratio	5.00%	5.00%
United Community
Compliance With Regulatory Capital Requirements Under Banking Regulations [Line Items]
Risk-based capital, Actual Amount	$ 248,306
Tier 1 capital to risk-weighted assets, Actual Amount	232,991
Common equity Tier 1 capital to risk-weighted assets, Actual Amount	232,991
Tier 1 capital to average total assets, Actual Amount	$ 232,991
Total risk-based capital to risk-weighted assets, Actual Ratio	20.57%
Tier 1 capital to risk-weighted assets, Actual Ratio	19.30%
Common equity Tier 1 capital to risk-weighted assets, Actual Ratio	19.30%
Tier 1 capital to average total assets, Actual Ratio	12.50%
Total risk-based capital to risk-weighted assets, Minimum Capital Amount	$ 96,565
Tier 1 capital to risk-weighted assets, Minimum Capital Amount	72,424
Common equity Tier 1 capital to risk-weighted assets, Minimum Capital Amount	54,318
Tier 1 capital to average total assets, Minimum Capital Amount	$ 74,541
Total risk-based capital to risk-weighted assets, Minimum Capital Ratio	8.00%
Tier 1 capital to risk-weighted assets, Minimum Capital Ratio	6.00%
Common equity Tier 1 capital to risk-weighted assets, Minimum Capital Ratio	4.50%
Tier 1 capital to average total assets, Minimum Capital Ratio	4.00%
Total risk-based capital to risk-weighted assets, To Be Well Capitalized Amount	$ 120,707
Tier 1 capital to risk-weighted assets, To Be Well Capitalized Amount	96,565
Common equity Tier 1 capital to risk-weighted assets, To Be Well Capitalized Amount	78,459
Tier 1 capital to average total assets, To Be Well Capitalized Amount	$ 93,176
Total risk-based capital to risk-weighted assets, To Be Well Capitalized Ratio	10.00%
Tier 1 capital to risk-weighted assets, To Be Well Capitalized Ratio	8.00%
Common equity Tier 1 capital to risk-weighted assets, To Be Well Capitalized Ratio	6.50%
Tier 1 capital to average total assets, To Be Well Capitalized Ratio	5.00%