Investment Securities - Summary of Carrying Value of Available-for-Sale Securities (Details) - USD ($) $ in Thousands	Jun. 30, 2025	Dec. 31, 2024
Debt Securities, Held-to-maturity, Allowance for Credit Loss [Line Items]
Total available-for-sale securities pledged	$ 8,724,543	$ 8,459,561
Pledged for deposits
Debt Securities, Held-to-maturity, Allowance for Credit Loss [Line Items]
Total available-for-sale securities pledged	1,797,620	1,596,378
Pledged for borrowings and other
Debt Securities, Held-to-maturity, Allowance for Credit Loss [Line Items]
Total available-for-sale securities pledged	$ 6,926,923	$ 6,863,183