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Fair Value Measurements (Summary Of Estimated Fair Values Of Significant Financial Instruments) (Detail) - USD ($)
$ in Thousands
Sep. 30, 2017
Jun. 30, 2017
Dec. 31, 2016
Sep. 30, 2016
Jun. 30, 2016
Dec. 31, 2015
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]            
Loans held for sale $ 32,855   $ 60,260      
Mortgage servicing assets, Carrying Amount 25,140 $ 24,708 24,466 $ 23,384 $ 21,946 $ 20,698
Alternative investments [Member]            
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]            
Alternative investments 17,300          
Fair Value, Measurements, Nonrecurring [Member] | Significant Unobservable Inputs (Level 3) [Member]            
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]            
Alternative investments 2,587          
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 17,244,618   16,832,268      
Securities sold under agreements to repurchase and other borrowings 902,902   949,526      
FHLB advances [1] 1,507,681   2,842,908      
Long-term debt [1] 225,704   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 18,636,744   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 2,218,491   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 10,296   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 25,140   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 4,497,311   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 905,249   955,660      
FHLB advances [1] 1,512,203   2,825,101      
Long-term debt [1] 235,686   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 17,155,002   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 18,636,744   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 2,213,155   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 12,539   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 44,992   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 $ 4,481,675   $ 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