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Borrowings - Narrative (Details) - Subordinated indebtedness, net - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Mar. 31, 2024
Debt Instrument [Line Items]
Subordinated indebtedness, net	$ 194,279	$ 160,684
BTH
Debt Instrument [Line Items]
Subordinated indebtedness, net	$ 34,700	$ 1,100
Debt instrument, redemption period, term threshold	5 years

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