FHLB Advances, Other Borrowings and Subordinated Notes - Schedule of FHLB Advances, Other Borrowings and Subordinated Notes (Details) - USD ($) $ in Thousands	Sep. 30, 2024	Dec. 31, 2023	Sep. 30, 2023
Debt Disclosure [Abstract]
FHLB advances	$ 3,171,309	$ 2,326,071	$ 2,326,071
Other borrowings:
Notes payable	149,894	171,282	178,411
Short-term borrowings	0	13,430	14,183
Secured borrowings	439,513	401,897	391,681
Other	57,636	59,204	59,724
Total other borrowings	647,043	645,813	643,999
Subordinated notes	298,188	437,866	437,731
Total FHLB advances, other borrowings and subordinated notes	$ 4,116,540	$ 3,409,750	$ 3,407,801