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Junior Subordinated Deferrable Interest Debentures - Schedule of Outstanding Trust Securities (Details) - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2024	Sep. 30, 2023
Debt Instrument [Line Items]
Carrying Amount	$ 50,718	$ 0
Luther Burbank Statutory Trust I | Junior subordinated deferrable interest debentures
Debt Instrument [Line Items]
Issued Amount	41,238
Carrying Amount	$ 33,681
Rate	6.59%
Variable rate	0.26%
Variable rate, spread adjustments	1.38%
Luther Burbank Statutory Trust II | Junior subordinated deferrable interest debentures
Debt Instrument [Line Items]
Issued Amount	$ 20,619
Carrying Amount	$ 17,037
Rate	6.83%
Variable rate	0.26%
Variable rate, spread adjustments	1.62%

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