Commitments and Contingent Liabilities - Commitments to Extend Credit, Guarantees and Various Letters of Credit Outstanding (Detail) - USD ($) $ in Thousands	Mar. 31, 2024	Dec. 31, 2023
Commitments and Contingencies Disclosure [Abstract]
Lines of credit	$ 3,991,363	$ 4,016,658
Loans approved but not closed	546,561	275,954
Overdraft limits	400,151	391,598
Letters of credit	41,812	38,929
Contingent obligations and other guarantees	$ 9,809	$ 15,037