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Period of time between issuance and maturity of debt instrument, in PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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The carrying amount as of the balance sheet date for the aggregate of other miscellaneous borrowings owed by the reporting entity.

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Borrowings - Narrative (Details) - USD ($) $ in Thousands	12 Months Ended
Borrowings - Narrative (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Mar. 31, 2026	Mar. 31, 2024	Dec. 31, 2022
Debt Instrument [Line Items]
Repurchase agreements	$ 1,486,850			$ 945,916
Debt securities, available-for-sale	4,785,719			5,307,307
Borrowings from FHLB	0			$ 1,800,000
Borrowings from FHLB, weighted rate				4.54%
Lines of credit	565,000
Other borrowings	81,695			$ 77,293
Forecast
Debt Instrument [Line Items]
Borrowings from FHLB			$ 1,800,000
Borrowings from FHLB, weighted rate		4.75%
Related Party
Debt Instrument [Line Items]
Other borrowings	$ 10,251			10,251
Federal Home Loan Bank Advances
Debt Instrument [Line Items]
Term	1 year
Secured Debt
Debt Instrument [Line Items]
Debt face amount	$ 2,740,000
Debt, weighted average interest rate	4.38%
Asset Pledged as Collateral \| Repurchase agreements
Debt Instrument [Line Items]
Debt securities, available-for-sale	$ 1,800,829			$ 1,378,962