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Fair Value Measurements (Summary Of Estimated Fair Values Of Significant Financial Instruments) (Detail) - USD ($)
$ in Thousands
Mar. 31, 2020
Dec. 31, 2019
Mar. 31, 2019
Dec. 31, 2018
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Investment securities held-to-maturity, net $ 5,486,206 $ 5,293,918    
Debt Securities, Held-to-maturity, Fair Value 5,642,527 5,380,653    
Mortgage servicing assets, Carrying Amount 16,391 17,484 $ 19,785 $ 21,215
Fair Value, Nonrecurring [Member] | Reported Value Measurement [Member]        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Investment securities held-to-maturity, net 5,485,894 5,293,918    
Loans and leases, net 20,556,593 19,827,890    
Securities sold under agreements to repurchase and other borrowings 1,262,749 1,040,431    
FHLB advances [1] 1,773,399 1,948,476    
Long-term debt [1] 571,212 540,364    
Fair Value, Nonrecurring [Member] | Reported Value Measurement [Member] | Deposits Liabilities, other than time deposits [Member]        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Time deposits 21,522,676 20,219,981    
Fair Value, Nonrecurring [Member] | Reported Value Measurement [Member] | Time Deposits [Member]        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Time deposits 2,991,161 3,104,765    
Fair Value, Nonrecurring [Member] | Reported Value Measurement [Member] | Residential Mortgage [Member]        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Mortgage servicing assets, Carrying Amount 16,391 17,484    
Fair Value, Nonrecurring [Member] | Estimate of Fair Value Measurement [Member] | Significant Other Observable Inputs (Level 2) [Member]        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Debt Securities, Held-to-maturity, Fair Value 5,642,527 5,380,653    
Securities sold under agreements to repurchase and other borrowings 1,268,094 1,041,042    
FHLB advances [1] 1,783,284 1,950,035    
Long-term debt [1] 500,410 555,775    
Fair Value, Nonrecurring [Member] | Estimate of Fair Value Measurement [Member] | Significant Unobservable Inputs (Level 3) [Member]        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Loans and leases, net 20,844,596 19,961,632    
Fair Value, Nonrecurring [Member] | Estimate of Fair Value Measurement [Member] | Deposits Liabilities, other than time deposits [Member] | Significant Other Observable Inputs (Level 2) [Member]        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Time deposits 21,522,676 20,219,981    
Fair Value, Nonrecurring [Member] | Estimate of Fair Value Measurement [Member] | Time Deposits [Member] | Significant Other Observable Inputs (Level 2) [Member]        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Time deposits 3,000,656 3,102,316    
Fair Value, Nonrecurring [Member] | Estimate of Fair Value Measurement [Member] | Residential Mortgage [Member] | Significant Unobservable Inputs (Level 3) [Member]        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Mortgage servicing assets, Fair value $ 20,846 $ 33,250    
[1] djustments to the carrying amount of long-term debt for basis adjustment and unamortized discount and debt issuance cost on senior fixed-rate notes are not included for determination of fair value Refer to Note 9: Borrowings for additional information.