Borrowings - Schedule of Long-Term Debt (Details) - USD ($) $ in Thousands	Mar. 31, 2025	Dec. 31, 2024
Debt Instrument [Line Items]
Subordinated fixed-to-floating rate notes	$ 897,733	$ 899,071
Debt issuance cost on 2029 senior notes	(1,070)	(1,137)
Long-term debt	907,410	909,185
Senior Notes
Debt Instrument [Line Items]
Discount on 2029 senior notes	(398)	(423)
Subordinated Debt
Debt Instrument [Line Items]
Premium on 2029 subordinated notes and 2030 subordinated notes	11,145	11,674
Junior Subordinated Debt
Debt Instrument [Line Items]
Subordinated fixed-to-floating rate notes	$ 77,320	77,320
Senior Notes Due 2029 | Senior Notes
Debt Instrument [Line Items]
Debt instrument, stated interest rate, percentage	4.10%
Subordinated fixed-to-floating rate notes	$ 321,413	322,751
Hedge basis adjustment	21,400	22,800
2029 subordinated notes | Subordinated Debt
Debt Instrument [Line Items]
Subordinated fixed-to-floating rate notes	$ 274,000	$ 274,000
Interest rate spread of LIBOR plus (as a percent)		2.53%
Variable interest rate	6.83%	6.84%
2030 subordinated notes | Subordinated Debt
Debt Instrument [Line Items]
Debt instrument, stated interest rate, percentage	3.875%
Subordinated fixed-to-floating rate notes	$ 225,000	$ 225,000
Junior Subordinated Debt
Debt Instrument [Line Items]
Interest rate spread of LIBOR plus (as a percent)	2.95%
Variable interest rate	7.51%	7.56%