Borrowings - Schedule of Borrowings (Detail) - USD ($) $ in Thousands	Sep. 30, 2024	Dec. 31, 2023	Sep. 30, 2023
Debt Disclosure [Abstract]
Securities sold under agreements with customers to repurchase	$ 57,557	$ 381,928	$ 621,791
Federal funds purchased	4,925	1,100	108,700
Other borrowings	21,053	21,053	21,053
Total	$ 83,535	$ 404,081	$ 751,544