Available for Sale Securities - Gross Unrealized Losses and Fair Value, Continuous Unrealized Loss Position (Details) $ in Thousands	Mar. 31, 2026 USD ($) security	Jun. 30, 2025 USD ($)
Debt Securities, Available-for-Sale [Line Items]
Less than 12 months, Fair Value	$ 60,464	$ 67,943
Less than 12 months, Unrealized Losses	224	557
12 months or more, Fair Value	173,537	196,523
12 months or more, Unrealized Losses	14,533	17,122
Total Fair Value	234,001	264,466
Total Unrealized Losses	14,757	17,679
Obligations of states and political subdivisions
Debt Securities, Available-for-Sale [Line Items]
Less than 12 months, Fair Value	5,033	4,882
Less than 12 months, Unrealized Losses	32	84
12 months or more, Fair Value	12,868	15,807
12 months or more, Unrealized Losses	1,208	1,688
Total Fair Value	17,901	20,689
Total Unrealized Losses	$ 1,240	1,772
Number of individual securities in an unrealized loss position for less than 12 months \| security	12
Number of individual securities in an unrealized loss position for more than 12 months \| security	26
Corporate obligations
Debt Securities, Available-for-Sale [Line Items]
Less than 12 months, Fair Value	$ 5,697	1,936
Less than 12 months, Unrealized Losses	39	6
12 months or more, Fair Value	7,187	18,194
12 months or more, Unrealized Losses	229	626
Total Fair Value	12,884	20,130
Total Unrealized Losses	$ 268	632
Number of individual securities in an unrealized loss position for less than 12 months \| security	5
Number of individual securities in an unrealized loss position for more than 12 months \| security	6
Asset-backed securities
Debt Securities, Available-for-Sale [Line Items]
Less than 12 months, Fair Value	$ 12,274	3,281
Less than 12 months, Unrealized Losses	28	2
12 months or more, Fair Value	867	839
12 months or more, Unrealized Losses	115	143
Total Fair Value	13,141	4,120
Total Unrealized Losses	$ 143	145
Number of individual securities in an unrealized loss position for less than 12 months \| security	3
Number of individual securities in an unrealized loss position for more than 12 months \| security	2
Other securities
Debt Securities, Available-for-Sale [Line Items]
Less than 12 months, Fair Value		15
12 months or more, Fair Value	$ 2,880	3,578
12 months or more, Unrealized Losses	44	53
Total Fair Value	2,880	3,593
Total Unrealized Losses	44	53
MBS and CMOs
Debt Securities, Available-for-Sale [Line Items]
Less than 12 months, Fair Value	37,460	57,829
Less than 12 months, Unrealized Losses	125	465
12 months or more, Fair Value	149,735	158,105
12 months or more, Unrealized Losses	12,937	14,612
Total Fair Value	187,195	215,934
Total Unrealized Losses	$ 13,062	$ 15,077
Number of individual securities in an unrealized loss position for less than 12 months \| security	15
Number of individual securities in an unrealized loss position for more than 12 months \| security	102

SOUTHERN MISSOURI BANCORP, INC. 10-Q