Organization and Summary of Significant Accounting Policies - Goodwill and Intangible Assets (Details) - USD ($) $ in Millions	12 Months Ended
	Jun. 30, 2023	Jun. 30, 2022
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	17.0
Intangibles assets, accumulated amortization	14.0	11.5
2024	4.1
2025	3.5
2026	3.0
2027	2.7
2028	2.7
Thereafter	11.5
Other identifiable intangibles
Finite-Lived Intangible Assets [Line Items]
Intangible assets, gross	6.4	3.8
Intangibles assets, accumulated amortization	3.9	3.8
Mortgage and SBA servicing rights
Finite-Lived Intangible Assets [Line Items]
Intangible assets, net	$ 2.9	$ 2.7
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