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Fair Value Measurements (Summary Of Estimated Fair Values Of Significant Financial Instruments) (Detail) - USD ($)
$ in Thousands
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
LHFS, at fair value option $ 60,260 $ 0    
Mortgage servicing assets, Carrying Amount 24,466 20,698 $ 19,379 $ 20,983
Reported Value Measurement [Member] | Fair Value, Measurements, Nonrecurring [Member]        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
LHFS, at fair value option [1] 7,317 37,091    
Loans and leases, net 16,832,268 15,496,745    
Securities sold under agreements to repurchase and other borrowings 949,526 1,151,400    
FHLB advances [2] 2,842,908 2,664,139    
Long-term debt [2] 225,514 225,260    
Reported Value Measurement [Member] | Fair Value, Measurements, Nonrecurring [Member] | Alternative investments [Member]        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Alternative investments 11,034 12,900    
Reported Value Measurement [Member] | Securities held-to-maturity [Member] | Fair Value, Measurements, Nonrecurring [Member]        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Held-to-maturity investment securities 4,160,658 3,923,052    
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 [1] 7,444 37,457    
Securities sold under agreements to repurchase and other borrowings 955,660 1,163,974    
FHLB advances [2] 2,825,101 2,647,872    
Long-term debt [2] 225,514 218,143    
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 16,678,106 15,453,892    
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 13,189 14,294    
Estimate of Fair Value Measurement [Member] | Securities held-to-maturity [Member] | Fair Value, Measurements, Nonrecurring [Member] | Fair Value, Inputs, Level 2 [Member]        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Held-to-maturity investment securities 4,125,125 3,961,534    
Deposits other than time deposits [Member] | Reported Value Measurement [Member] | Fair Value, Measurements, Nonrecurring [Member]        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Deposits 17,279,049 15,866,624    
Deposits other than time deposits [Member] | 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]        
Deposits 17,279,049 15,866,624    
Time Deposits [Member] | Reported Value Measurement [Member] | Fair Value, Measurements, Nonrecurring [Member]        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Deposits 2,024,808 2,086,154    
Time Deposits [Member] | 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]        
Deposits 2,024,395 2,095,357    
Residential Mortgage [Member]        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Mortgage servicing assets 52,075 33,568 $ 28,690  
Residential Mortgage [Member] | Reported Value Measurement [Member] | Fair Value, Measurements, Nonrecurring [Member]        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Mortgage servicing assets, Carrying Amount 24,466 20,698    
Residential Mortgage [Member] | 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]        
Mortgage servicing assets $ 52,075 $ 33,568    
[1] Loans held for sale that are accounted for at the lower of cost or market. At December 31, 2016, the amounts include transferred residential and commercial loans not originated for sale, and at December 31, 2015, the amounts include transferred commercial loans not originated for sale and residential loans originated for sale prior to the adoption of the fair value option of ASC Topic 825 "Financial Instruments."
[2] The following adjustments to the carrying amount are not included for determination of fair value, see Note 10: Borrowings:•FHLB advances - unamortized premiums on advances•Long-term debt - unamortized discount and debt issuance cost on senior fixed-rate notes