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Business Combination - Schedule of Assets Acquired and Liabilities Assumed (Details) - USD ($) $ in Thousands	Mar. 31, 2024	Mar. 01, 2024	Dec. 31, 2023	Sep. 30, 2023
Fair value of liabilities assumed
Goodwill	$ 411,401		$ 305,125	$ 304,750
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		3,205,350
Loans held for sale		2,993,223
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		132,837
Other assets		75,885
Total assets acquired		7,676,343
Fair value of liabilities assumed
Customer accounts		5,640,440
Accrued expenses and other liabilities		100,408
Total liabilities assumed		7,316,675
Net Assets Acquired		359,668
Goodwill		105,836
Luther Burbank | Borrowings
Fair value of liabilities assumed
Debt		1,432,138
Luther Burbank | Junior subordinated deferrable interest debentures
Fair value of liabilities assumed
Debt		50,175
Luther Burbank | Senior Debt
Fair value of liabilities assumed
Debt		$ 93,514

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