Regulatory Capital Requirements - Components of Regulatory Capital (Detail) - USD ($) $ in Thousands	Mar. 31, 2017	Dec. 31, 2016	Mar. 31, 2016	Dec. 31, 2015
Compliance With Regulatory Capital Requirements Under Banking Regulations [Line Items]
Total shareholders' equity	$ 277,102	$ 249,806	$ 251,804	$ 244,245
Accumulated other comprehensive income	(20,042)	(21,040)
Home Savings [Member]
Compliance With Regulatory Capital Requirements Under Banking Regulations [Line Items]
Total shareholders' equity	254,575	216,475
Accumulated other comprehensive income	20,057	21,056
Intangible assets	(20,377)	(3)
Disallowed deferred tax assets	(7,873)	(7,590)
Tier 1 Capital	246,382	229,938
Allowance for loan losses and allowance for unfunded lending commitments limited to 1.25% of total risk-weighted assets	18,946	18,923
Total risk-based capital	265,328	248,861
United Community [Member]
Compliance With Regulatory Capital Requirements Under Banking Regulations [Line Items]
Total shareholders' equity	277,102	249,806
Accumulated other comprehensive income	20,042	21,040
Intangible assets	(22,877)	(1,567)
Disallowed deferred tax assets	(11,407)	(10,410)
Tier 1 Capital	262,860	258,869
Allowance for loan losses and allowance for unfunded lending commitments limited to 1.25% of total risk-weighted assets	18,970	18,948
Total risk-based capital	$ 281,830	$ 277,817