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Business Combination - Schedule of Assets Acquired and Liabilities Assumed (Details) - USD ($) $ in Thousands	Sep. 30, 2024	Mar. 01, 2024	Sep. 30, 2023	Sep. 30, 2022
Fair value of liabilities assumed
Goodwill	$ 411,360		$ 304,750	$ 303,457
Luther Burbank
Business Acquisition [Line Items]
Total merger consideration		$ 465,504
Fair value of assets acquired
Cash and cash equivalents		627,403
Investment securities		518,878
Loans receivable		3,189,887
Loans held for sale		3,017,506
Interest receivable		25,697
Premises and equipment		6,436
FHLB stock		35,831
Bank owned life insurance		17,781
Intangible assets		37,022
Deferred tax asset, net		125,151
Other assets		75,585
Total assets acquired		7,677,177
Fair value of liabilities assumed
Customer accounts		5,640,440
Accrued expenses and other liabilities		100,113
Total liabilities assumed		7,316,380
Net Assets Acquired		360,797
Goodwill		104,707
Luther Burbank | Borrowings
Fair value of liabilities assumed
Junior subordinated deferrable interest debentures		1,432,138
Luther Burbank | Junior subordinated deferrable interest debentures
Fair value of liabilities assumed
Junior subordinated deferrable interest debentures		50,175
Luther Burbank | Senior Debt
Fair value of liabilities assumed
Junior subordinated deferrable interest debentures		$ 93,514

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