Borrowings - Schedule of Borrowings (Detail) - USD ($) $ in Thousands	Mar. 31, 2024	Dec. 31, 2023	Mar. 31, 2023
Debt Disclosure [Abstract]
Securities sold under agreements with customers to repurchase	$ 307,297	$ 381,928	$ 608,299
Federal funds purchased	5,750	1,100	3,575
Other borrowings	21,053	21,053	21,053
Total	26,803	22,153	24,628
Total	$ 334,100	$ 404,081	$ 632,927