Capital - Reconciliation of the Bank's Total Equity Capital Under US GAAP and Regulatory Capital Amounts (Details) - USD ($) $ in Thousands	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2017
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Total stockholders' equity under US GAAP	$ 408,263	$ 408,896	$ 409,242	$ 397,647
Tier I Capital and CET1	362,841	355,759
Total Risk-based Capital	391,368	377,639
HomeTrust Bancshares, Inc.
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Total stockholders' equity under US GAAP	408,263	408,896
Accumulated other comprehensive income, net of tax	(2,017)	(733)
Investment in nonincludable subsidiary	(815)	(780)
Disallowed deferred tax assets	(4,526)	(5,092)
Disallowed goodwill and other disallowed intangible assets	(26,468)	(27,562)
Tier I Capital and CET1	374,437	374,729
Allowable portion of allowance for loan losses and loan commitments	28,527	21,884
Total Risk-based Capital	$ 402,964	$ 396,613