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Loans and Leases and the Allowance for Credit Losses - Changes in Allowance for Credit Losses (Parenthetical) (Detail) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Apr. 01, 2022
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2023
Sep. 30, 2022
Financing Receivable, Allowance for Credit Loss [Line Items]          
Provision for credit losses   $ 150,000 $ 115,000 $ 420,000 $ 427,000
Charge-offs   $ (122,128) $ (101,267) $ (379,291) (227,919)
Non PCD Acquired Loans [Member]          
Financing Receivable, Allowance for Credit Loss [Line Items]          
Provision for credit losses         242,000
PCD Acquired Loans [Member]          
Financing Receivable, Allowance for Credit Loss [Line Items]          
Charge-offs $ (33,000)       $ (33,000)