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Organization and Summary of Significant Accounting Policies - Goodwill and Intangible Assets (Details) - USD ($) $ in Millions | 6 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2023 | Jun. 30, 2023
Finite-Lived Intangible Assets [Line Items] |  |
Impairment loss on goodwill | $ 0.0 | $ 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 | 15.9 | 14.0
Remainder of fiscal 2024 | 2.0 |
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 | 6.4
Intangibles assets, accumulated amortization | 4.1 | 3.9
Mortgage and SBA servicing rights |  |
Finite-Lived Intangible Assets [Line Items] |  |
Intangible assets, net | $ 2.9 | $ 2.9
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 |

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