Loans and Leases (Summary Of The Recorded Investment Of Company's TDRs) (Detail) - USD ($) $ in Thousands	Mar. 31, 2024	Dec. 31, 2023	Mar. 31, 2023	Dec. 31, 2022
Financing Receivable, Troubled Debt Restructuring [Line Items]
Financing Receivable, Allowance for Credit Loss, Excluding Accrued Interest	$ 641,442	$ 635,737	$ 613,914	$ 594,741
Commercial Portfolio Segment [Member]
Financing Receivable, Troubled Debt Restructuring [Line Items]
Financing Receivable, Allowance for Credit Loss, Excluding Accrued Interest	589,109	577,663	554,750	533,125
Consumer Portfolio Segment [Member]
Financing Receivable, Troubled Debt Restructuring [Line Items]
Financing Receivable, Allowance for Credit Loss, Excluding Accrued Interest	$ 52,333	$ 58,074	$ 59,164	$ 61,616