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Commitments and Contingent Liabilities - Commitments to Extend Credit, Guarantees and Various Letters of Credit Outstanding (Detail) - USD ($)
$ in Thousands
Dec. 31, 2021
Dec. 31, 2020
Commitments and Contingencies Disclosure [Abstract]    
Lines of credit $ 2,954,147 $ 2,510,011
Loans approved but not closed 472,810 381,180
Overdraft limits 370,439 154,322
Letters of credit 29,017 53,788
Contingent obligations and other guarantees $ 68,235 $ 126,984