Capital - Reconciliation of the Bank's Total Equity Capital Under US GAAP and Regulatory Capital Amounts (Details) - USD ($) $ in Thousands	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2014
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Total stockholders' equity under US GAAP	$ 397,647	$ 359,976	$ 371,050	$ 377,151
Tier I Capital	305,216	280,598
Total Risk-based Capital	326,635	302,271
HomeTrust Bancshares, Inc.
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Total stockholders' equity under US GAAP	397,647	359,976
Accumulated other comprehensive income, net of tax	(273)	(2,343)
Investment in nonincludable subsidiary	(881)	(926)
Disallowed deferred tax assets	(24,576)	(24,079)
Disallowed goodwill and other disallowed intangible assets	(29,253)	(15,370)
Tier I Capital	342,664	317,258
Allowable portion of allowance for loan losses	21,605	21,747
Total Risk-based Capital	$ 364,269	$ 339,005