Commitments and Contingent Liabilities - Commitments to Extend Credit, Guarantees and Various Letters of Credit Outstanding (Detail) - USD ($) $ in Thousands	Jun. 30, 2025	Dec. 31, 2024
Commitments and Contingencies Disclosure [Abstract]
Lines of credit	$ 5,059,269	$ 3,960,185
Loans approved but not closed	512,141	365,529
Overdraft limits	548,175	387,591
Letters of credit	55,513	47,879
Contingent obligations and other guarantees	$ 33,080	$ 16,574