Capital - Schedule of Compliance with Regulatory Capital Requirements under Banking Regulations (Details) - USD ($) $ in Thousands	Jun. 30, 2020	Jun. 30, 2019
Common Equity Tier I Capital
Common Equity Tier I Capital	$ 362,841	$ 355,759
Common Equity Tier I Capital (as a percent)	10.91%	11.59%
Common Equity Tier I Capital, Minimum for Capital Adequacy Purposes	$ 149,608	$ 138,153
Common Equity Tier I Capital, Minimum for Capital Adequacy Purposes (as a percent)	4.50%	4.50%
Common Equity Tier I Capital, Minimum for Be Well Capitalized	$ 216,100	$ 199,555
Common Equity Tier I Capital, Minimum to Be Well Capitalized (as a percent)	6.50%	6.50%
Tier I Capital (to Total Adjusted Assets)
Tier 1 Capital (to Total Adjusted Assets)	$ 362,841	$ 355,759
Tier 1 Capital (to Total Adjusted Assets) (as a percent)	0.0994	0.1034
Tier 1 Capital (to Total Adjusted Assets), Minimum for Capital Adequacy Purposes	$ 146,010	$ 137,590
Tier 1 Capital (to Total Adjusted Assets), Minimum for Capital Adequacy Purposes (as a percent)	0.04	0.04
Tier 1 Capital (to Total Adjusted Assets), Minimum to Be Well Capitalized	$ 182,512	$ 171,988
Tier 1 Capital (to Total Adjusted Assets), Minimum to Be Well Capitalized (as a percent)	0.05	0.05
Tier I Capital (to Risk-weighted Assets)
Tier 1 Capital (to Risk-weighted Assets)	$ 362,841	$ 355,759
Tier 1 Capital (to Risk-weighted Assets) (as a percent)	0.1091	0.1159
Tier 1 Capital (to Risk-weighted Assets), Minimum for Capital Adequacy Purposes	$ 199,477	$ 184,204
Tier 1 Capital (to Risk-weighted Assets), Minimum for Capital Adequacy Purposes (as a percent)	0.06	0.06
Tier 1 Capital (to Risk-weighted Assets), Minimum to Be Well Capitalized	$ 265,969	$ 245,606
Tier I Capital (to Risk-weighted Assets), Minimum to Be Well Capitalized (as a percent)	0.08	0.08
Total Risk-based Capital (to Risk-weighted Assets)
Total Risk-based Capital (to Risk-weighted Assets)	$ 391,368	$ 377,639
Total Risk-based Capital (to Risk-weighted Assets) (as a percent)	0.1177	0.1230
Banking Regulation, Total Risk-Based Capital, Capital Adequacy, Minimum	$ 265,969	$ 245,606
Total Risk-based Capital (to Risk-weighted Assets), Minimum for Capital Adequacy Purposes	0.0377
Total Risk-based Capital (to Risk-weighted Assets), Minimum for Capital Adequacy Purposes (as a percent)	0.08	0.08
Total Risk-based Capital (to Risk-weighted Assets), Minimum to Be Well Capitalized	$ 332,461	$ 307,007
Total Risk-based Capital (to Risk-weighted Assets), Minimum to Be Well Capitalized (as a percent)	0.1	0.1
HomeTrust Bancshares, Inc.
Common Equity Tier I Capital
Common Equity Tier I Capital	$ 374,437	$ 374,729
Common Equity Tier I Capital (as a percent)	11.26%	12.20%
Common Equity Tier I Capital, Minimum for Capital Adequacy Purposes	$ 149,614	$ 138,226
Common Equity Tier I Capital, Minimum for Capital Adequacy Purposes (as a percent)	4.50%	4.50%
Common Equity Tier I Capital, Minimum for Be Well Capitalized	$ 216,109	$ 199,659
Common Equity Tier I Capital, Minimum to Be Well Capitalized (as a percent)	6.50%	6.50%
Tier I Capital (to Total Adjusted Assets)
Tier 1 Capital (to Total Adjusted Assets)	$ 374,437	$ 374,729
Tier 1 Capital (to Total Adjusted Assets) (as a percent)	0.1026	0.1089
Tier 1 Capital (to Total Adjusted Assets), Minimum for Capital Adequacy Purposes	$ 146,047	$ 137,649
Tier 1 Capital (to Total Adjusted Assets), Minimum for Capital Adequacy Purposes (as a percent)	0.04	0.04
Tier 1 Capital (to Total Adjusted Assets), Minimum to Be Well Capitalized	$ 182,559	$ 172,062
Tier 1 Capital (to Total Adjusted Assets), Minimum to Be Well Capitalized (as a percent)	0.05	0.05
Tier I Capital (to Risk-weighted Assets)
Tier 1 Capital (to Risk-weighted Assets)	$ 374,437	$ 374,729
Tier 1 Capital (to Risk-weighted Assets) (as a percent)	0.1126	0.1220
Tier 1 Capital (to Risk-weighted Assets), Minimum for Capital Adequacy Purposes	$ 199,485	$ 184,301
Tier 1 Capital (to Risk-weighted Assets), Minimum for Capital Adequacy Purposes (as a percent)	0.06	0.06
Tier 1 Capital (to Risk-weighted Assets), Minimum to Be Well Capitalized	$ 265,980	$ 245,734
Tier I Capital (to Risk-weighted Assets), Minimum to Be Well Capitalized (as a percent)	0.08	0.08
Total Risk-based Capital (to Risk-weighted Assets)
Total Risk-based Capital (to Risk-weighted Assets)	$ 402,964	$ 396,613
Total Risk-based Capital (to Risk-weighted Assets) (as a percent)	0.1212	0.1291
Banking Regulation, Total Risk-Based Capital, Capital Adequacy, Minimum	$ 265,980	$ 245,734
Total Risk-based Capital (to Risk-weighted Assets), Minimum for Capital Adequacy Purposes	0.0412
Total Risk-based Capital (to Risk-weighted Assets), Minimum for Capital Adequacy Purposes (as a percent)	0.08	0.08
Total Risk-based Capital (to Risk-weighted Assets), Minimum to Be Well Capitalized	$ 332,476	$ 307,168
Total Risk-based Capital (to Risk-weighted Assets), Minimum to Be Well Capitalized (as a percent)	0.1	0.1