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Other Borrowings - Summary of Balances of Other Borrowings (Detail) - USD ($)	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Debt Instrument [Line Items]
Total other borrowings	$ 632,582,000	$ 264,605,000
5.70% Fixed Rated Collateralized Borrowings
Debt Instrument [Line Items]
Other secured financings	$ 400,000,000	0
Collateralized borrowing, fixed rate	5.70%
4.75%Fixed Rated Collateralized Borrowings
Debt Instrument [Line Items]
Other secured financings	$ 200,000,000	0
Collateralized borrowing, fixed rate	4.75%
4.65% Fixed Rate Collateralized Borrowings
Debt Instrument [Line Items]
Other secured financings	$ 0	216,700,000
Collateralized borrowing, fixed rate	4.65%
0.05% Fixed Rate Collateralized Borrowings
Debt Instrument [Line Items]
Other secured financings	$ 32,582,000	$ 47,905,000
Collateralized borrowing, fixed rate	0.05%		0.05%

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