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Fair Value Measurements (Summary Of Estimated Fair Values Of Significant Financial Instruments) (Detail) - USD ($)
$ in Thousands
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2016
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2015
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]            
Loans held for sale $ 39,407   $ 60,260      
Mortgage servicing assets, Carrying Amount 24,708 $ 24,336 24,466 $ 21,946 $ 21,004 $ 20,698
Alternative investments [Member]            
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]            
Alternative investments 16,500          
Fair Value, Measurements, Nonrecurring [Member] | Reported Value Measurement [Member]            
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]            
Loans held for sale 0   7,317      
Loans and leases, net 17,074,100   16,832,268      
Securities sold under agreements to repurchase and other borrowings 872,692   949,526      
FHLB advances [1] 1,767,757   2,842,908      
Long-term debt [1] 225,640   225,514      
Fair Value, Measurements, Nonrecurring [Member] | Reported Value Measurement [Member] | Deposits Liabilities, other than time deposits [Member]            
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]            
Deposits 18,362,556   17,279,049      
Fair Value, Measurements, Nonrecurring [Member] | Reported Value Measurement [Member] | Time Deposits [Member]            
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]            
Deposits 2,095,541   2,024,808      
Fair Value, Measurements, Nonrecurring [Member] | Reported Value Measurement [Member] | Alternative investments [Member]            
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]            
Alternative investments 9,882   11,034      
Fair Value, Measurements, Nonrecurring [Member] | Reported Value Measurement [Member] | Residential Mortgage [Member]            
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]            
Mortgage servicing assets, Carrying Amount 24,708   24,466      
Fair Value, Measurements, Nonrecurring [Member] | Reported Value Measurement [Member] | Held-to-maturity Securities [Member]            
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]            
Held-to-maturity investment securities 4,219,198   4,160,658      
Fair Value, Measurements, 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]            
Loans held for sale 0   7,444      
Securities sold under agreements to repurchase and other borrowings 876,289   955,660      
FHLB advances [1] 1,774,605   2,825,101      
Long-term debt [1] 240,959   225,514      
Fair Value, Measurements, 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 16,928,626   16,678,106      
Fair Value, Measurements, 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]            
Deposits 18,362,556   17,279,049      
Fair Value, Measurements, 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]            
Deposits 2,092,851   2,024,395      
Fair Value, Measurements, Nonrecurring [Member] | Estimate of Fair Value Measurement [Member] | Alternative investments [Member] | Significant Unobservable Inputs (Level 3) [Member]            
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]            
Alternative investments 11,644   13,189      
Fair Value, Measurements, 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 44,406   52,075      
Fair Value, Measurements, Nonrecurring [Member] | Estimate of Fair Value Measurement [Member] | Held-to-maturity Securities [Member] | Significant Other Observable Inputs (Level 2) [Member]            
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]            
Held-to-maturity investment securities $ 4,197,378   $ 4,125,125      
[1] he following adjustments to the carrying amount are not included for determination of fair value, see Note 8: Borrowings:
FHLB advances - unamortized premiums on advances
Long-term debt - unamortized discount and debt issuance cost on senior fixed-rate notes