Loans and Leases (Summary Of The Recorded Investment Of Company's TDRs) (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Financing Receivable, Troubled Debt Restructuring [Line Items]
Total recorded investment of TDR	$ 194,822	$ 163,344
Specific reserves for TDR included in the balance of ALLL	594,741	301,187	$ 359,431	$ 209,096
Additional funds committed to borrowers in TDR status	1,724	5,975
Commercial
Financing Receivable, Troubled Debt Restructuring [Line Items]
Specific reserves for TDR included in the balance of ALLL	533,125	257,877	312,244	161,669
Financing Receivables, Impaired, Troubled Debt Restructuring, Write-down	14,700	3,000	17,600
Consumer
Financing Receivable, Troubled Debt Restructuring [Line Items]
Specific reserves for TDR included in the balance of ALLL	61,616	43,310	47,187	$ 47,427
Financing Receivables, Impaired, Troubled Debt Restructuring, Write-down	300	400	$ 800
Performing Financial Instruments [Member]
Financing Receivable, Troubled Debt Restructuring [Line Items]
Total recorded investment of TDR	110,868	110,625
Nonperforming Financial Instruments [Member]
Financing Receivable, Troubled Debt Restructuring [Line Items]
Total recorded investment of TDR	83,954	52,719
Troubled Debt Restructures [Member] | Nonperforming Financial Instruments [Member] | Commercial
Financing Receivable, Troubled Debt Restructuring [Line Items]
Specific reserves for TDR included in the balance of ALLL	14,578	9,017
Troubled Debt Restructures [Member] | Nonperforming Financial Instruments [Member] | Consumer
Financing Receivable, Troubled Debt Restructuring [Line Items]
Specific reserves for TDR included in the balance of ALLL	$ 3,559	$ 3,745