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Business Combination - Narrative (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Mar. 31, 2025	Mar. 31, 2024	Mar. 31, 2025	Mar. 31, 2024	Dec. 31, 2024	Sep. 30, 2024	Mar. 01, 2024
Business Acquisition [Line Items]
Goodwill	$ 414,723		$ 414,723		$ 414,723	$ 411,360
Luther Burbank
Business Acquisition [Line Items]
Goodwill							$ 107,890
Other intangible assets							$ 37,022
Merger related expenses	$ 239	$ 25,119	$ 239	$ 25,636

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Amount, after accumulated impairment loss, of asset representing future economic benefit arising from other asset acquired in business combination or from joint venture formation or both, that is not individually identified and separately recognized.

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