Organization and Summary of Significant Accounting Policies - Intangible Assets (Details) - USD ($)	3 Months Ended	12 Months Ended
	Sep. 30, 2021	Jun. 30, 2021
Finite-Lived Intangible Assets [Line Items]
Impairment loss on goodwill	$ 0	$ 0
Gross core deposit intangibles, accumulated amortization	10,400,000
Gross other identifiable intangibles	3,800,000	3,800,000
Gross other identifiable intangibles, accumulated amortization	3,800,000	3,800,000
Mortgage servicing rights	$ 1,900,000	1,900,000
Gross core deposit intangibles		15,300,000
Gross core deposit intangibles accumulated amortization		10,100,000
Core deposit intangible assets, amortization method	using the straight line method
Remainder of fiscal 2022	$ 1,000,000.0
2023	1,400,000
2024	1,400,000
2025	807,000
Thereafter	328,000
Impairment of intangible assets	0	$ 0
Core Deposits
Finite-Lived Intangible Assets [Line Items]
Intangible assets	$ 15,300,000
Minimum
Finite-Lived Intangible Assets [Line Items]
Core deposit intangible assets amortized period	5 years
Maximum
Finite-Lived Intangible Assets [Line Items]
Core deposit intangible assets amortized period	7 years