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Fair Value Measurements (Summary Of Estimated Fair Values Of Significant Financial Instruments) (Detail) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
LHFS, at fair value option $ 20,888 $ 60,260    
Mortgage servicing assets, Carrying Amount 25,139 24,466 $ 20,698 $ 19,379
Alternative investments [Member]        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Alternative investments 18,000      
Reported Value Measurement [Member] | Fair Value, Measurements, Nonrecurring [Member]        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
LHFS, at fair value option 0 7,317    
Loans and leases, net 17,323,864 16,832,268    
Securities sold under agreements to repurchase and other borrowings 643,269 949,526    
FHLB advances 1,677,105 2,842,908    
Long-term debt 225,767 225,514    
Reported Value Measurement [Member] | Fair Value, Measurements, Nonrecurring [Member] | Deposits other than time deposits [Member]        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Deposits 18,525,321 17,279,049    
Reported Value Measurement [Member] | Fair Value, Measurements, Nonrecurring [Member] | Time Deposits [Member]        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Deposits 2,468,408 2,024,808    
Reported Value Measurement [Member] | Fair Value, Measurements, Nonrecurring [Member] | Residential Mortgage [Member]        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Mortgage servicing assets, Carrying Amount 25,139 24,466    
Reported Value Measurement [Member] | Fair Value, Measurements, Nonrecurring [Member] | Securities held-to-maturity [Member]        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Held-to-maturity investment securities 4,487,392 4,160,658    
Reported Value Measurement [Member] | Fair Value, Measurements, Nonrecurring [Member] | Alternative investments [Member]        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Alternative investments 10,562 11,034    
Estimate of Fair Value Measurement [Member] | Fair Value, Measurements, Nonrecurring [Member] | Fair Value, Inputs, Level 2 [Member]        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
LHFS, at fair value option 0 7,444    
Securities sold under agreements to repurchase and other borrowings 644,084 955,660    
FHLB advances 1,678,070 2,825,101    
Long-term debt 234,359 225,514    
Estimate of Fair Value Measurement [Member] | Fair Value, Measurements, Nonrecurring [Member] | Fair Value, Inputs, Level 2 [Member] | Deposits other than time deposits [Member]        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Deposits 18,525,321 17,279,049    
Estimate of Fair Value Measurement [Member] | Fair Value, Measurements, Nonrecurring [Member] | Fair Value, Inputs, Level 2 [Member] | Time Deposits [Member]        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Deposits 2,455,245 2,024,395    
Estimate of Fair Value Measurement [Member] | Fair Value, Measurements, Nonrecurring [Member] | Fair Value, Inputs, Level 2 [Member] | Securities held-to-maturity [Member]        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Held-to-maturity investment securities 4,456,350 4,125,125    
Estimate of Fair Value Measurement [Member] | Fair Value, Measurements, Nonrecurring [Member] | Significant Unobservable Inputs (Level 3) [Member]        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Loans and leases, net 17,211,619 16,678,106    
Estimate of Fair Value Measurement [Member] | Fair Value, Measurements, Nonrecurring [Member] | Significant Unobservable Inputs (Level 3) [Member] | Residential Mortgage [Member]        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Mortgage servicing assets 45,309 52,075    
Estimate of Fair Value Measurement [Member] | Fair Value, Measurements, Nonrecurring [Member] | Significant Unobservable Inputs (Level 3) [Member] | Alternative investments [Member]        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Alternative investments $ 12,940 $ 13,189