Other Borrowings - Summary of Balances of Other Borrowings (Detail) - USD ($) $ in Thousands	Mar. 31, 2024	Dec. 31, 2023
Debt Instrument [Line Items]
Total other borrowings	$ 392,409	$ 632,582
4.75% Fixed Rated Collateralized Borrowings
Debt Instrument [Line Items]
Other secured financings	$ 200,000	$ 200,000
Collateralized borrowing, fixed rate	4.75%	4.75%
5.69% Fixed Rated Collateralized Borrowings
Debt Instrument [Line Items]
Other secured financings	$ 167,000	$ 0
Collateralized borrowing, fixed rate	5.69%	5.69%
5.70% Fixed Rated Collateralized Borrowings
Debt Instrument [Line Items]
Other secured financings	$ 0	$ 400,000
Collateralized borrowing, fixed rate	5.70%	5.70%
0.05% Fixed Rate Collateralized Borrowings
Debt Instrument [Line Items]
Other secured financings	$ 25,409	$ 32,582
Collateralized borrowing, fixed rate	0.05%	0.05%