Commitments and Contingent Liabilities - Commitments to Extend Credit, Guarantees and Various Letters of Credit Outstanding (Detail) - USD ($) $ in Thousands	Sep. 30, 2022	Dec. 31, 2021
Commitments and Contingencies Disclosure [Abstract]
Lines of credit	$ 3,548,242	$ 2,954,147
Loans approved but not closed	419,150	472,810
Overdraft limits	386,972	370,439
Letters of credit	30,011	29,017
Contingent obligations and other guarantees	$ 32,472	$ 68,235