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Loans and Leases (Summary Of The Recorded Investment Of Company's TDRs) (Detail) - USD ($)
$ in Thousands
Mar. 31, 2020
Dec. 31, 2019
Mar. 31, 2019
Dec. 31, 2018
Financing Receivable, Troubled Debt Restructuring [Line Items]        
Total recorded investment of TDRs $ 258,127 $ 237,438    
Specific reserves for TDRs included in the balance of ACL on loans and leases 334,931 209,096 $ 211,389 $ 212,353
Additional funds committed to borrowers in TDR status 6,949 4,856    
Performing Financial Instruments [Member]        
Financing Receivable, Troubled Debt Restructuring [Line Items]        
Total recorded investment of TDRs 157,235 136,449    
Nonperforming Financial Instruments [Member]        
Financing Receivable, Troubled Debt Restructuring [Line Items]        
Total recorded investment of TDRs 100,892 100,989    
Nonperforming Financial Instruments [Member] | Troubled Debt Restructures [Member]        
Financing Receivable, Troubled Debt Restructuring [Line Items]        
Specific reserves for TDRs included in the balance of ACL on loans and leases $ 11,984 $ 12,956