Regulatory Capital Requirements - Components of Regulatory Capital (Detail) - USD ($) $ in Thousands	Sep. 30, 2016	Dec. 31, 2015	Sep. 30, 2015	Dec. 31, 2014
Compliance With Regulatory Capital Requirements Under Banking Regulations [Line Items]
Total shareholders' equity	$ 256,403	$ 244,245	$ 243,929	$ 240,135
Accumulated other comprehensive income	(10,251)	(19,220)
Home Savings [Member]
Compliance With Regulatory Capital Requirements Under Banking Regulations [Line Items]
Total shareholders' equity	234,598	220,872
Accumulated other comprehensive income	10,268	19,236
Intangible assets	(4)	(12)
Disallowed deferred tax assets	(9,632)	(15,610)
Tier 1 Capital	235,230	224,486
Allowance for loan losses and allowance for unfunded lending commitments limited to 1.25% of total risk-weighted assets	18,210	16,211
Total risk-based capital	253,440	240,697
United Community [Member]
Compliance With Regulatory Capital Requirements Under Banking Regulations [Line Items]
Total shareholders' equity	256,403	244,245
Accumulated other comprehensive income	10,251	19,220
Intangible assets	(1,542)	(12)
Disallowed deferred tax assets	(12,231)	(17,950)
Tier 1 Capital	252,881	245,503
Allowance for loan losses and allowance for unfunded lending commitments limited to 1.25% of total risk-weighted assets	18,234	16,229
Total risk-based capital	$ 271,115	$ 261,732