Organization and Summary of Significant Accounting Policies - Goodwill and Intangible Assets (Details) - USD ($) $ in Millions	12 Months Ended
	Jun. 30, 2025	Jun. 30, 2024
Finite-Lived Intangible Assets [Line Items]
Impairment loss on goodwill	$ 0.0
Core deposit intangible assets, amortization method	using the straight line method
Impairment of intangible assets	$ 0.0	$ 0.0
Core Deposits
Finite-Lived Intangible Assets [Line Items]
Intangible assets, gross	39.1	39.1
Intangibles assets, accumulated amortization	21.1	17.8
2026	3.1
2027	2.7
2028	2.7
2029	2.7
2030	2.5
Thereafter	6.4
Other identifiable intangibles
Finite-Lived Intangible Assets [Line Items]
Intangible assets, gross	6.4	6.4
Intangibles assets, accumulated amortization	4.5	4.2
Mortgage and SBA servicing rights
Finite-Lived Intangible Assets [Line Items]
Intangible assets, net	$ 2.9	$ 3.0
Minimum | Core Deposits
Finite-Lived Intangible Assets [Line Items]
Intangible assets, amortization period	5 years
Maximum | Core Deposits
Finite-Lived Intangible Assets [Line Items]
Intangible assets, amortization period	10 years