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Business Combination - Summary of Merger-Related Expenses (Details) - Luther Burbank - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2024	Sep. 30, 2023
Business Acquisition [Line Items]
Merger-related expenses	$ 26,319	$ 3,015
Severance and employee-related
Business Acquisition [Line Items]
Merger-related expenses	18,846	0
Legal and Professional
Business Acquisition [Line Items]
Merger-related expenses	5,573	2,773
Charitable contributions
Business Acquisition [Line Items]
Merger-related expenses	1,000	0
System conversion and integration
Business Acquisition [Line Items]
Merger-related expenses	$ 900	$ 242

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 805
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 5
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