Allowance for Credit Losses - Schedule Of Credit Losses Related To Accrued Interest Receivables and Written Off (Detail) - USD ($) $ in Thousands	Mar. 31, 2024	Dec. 31, 2023
Accrued Interest Receivables And Written Off Status [Line Items]
Total	$ 91,178	$ 88,963
Other Commercial [Member]
Accrued Interest Receivables And Written Off Status [Line Items]
Accrued Interest Receivable	12,540	14,562
Residential Real Estate [Member]
Accrued Interest Receivables And Written Off Status [Line Items]
Accrued Interest Receivable	20,931	20,718
Owner-Occupied [Member] | Commercial Real Estate [Member]
Accrued Interest Receivables And Written Off Status [Line Items]
Accrued Interest Receivable	4,662	4,751
Nonowner-Occupied [Member] | Commercial Real Estate [Member]
Accrued Interest Receivables And Written Off Status [Line Items]
Accrued Interest Receivable	36,089	27,507
Construction [Member]
Accrued Interest Receivables And Written Off Status [Line Items]
Accrued Interest Receivable	14,438	18,504
Bankcard [Member] | Consumer [Member]
Accrued Interest Receivables And Written Off Status [Line Items]
Accrued Interest Receivable	0	0
Other Consumer [Member] | Consumer [Member]
Accrued Interest Receivables And Written Off Status [Line Items]
Accrued Interest Receivable	$ 2,518	$ 2,921