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Fair Value Measurements (Summary Of Estimated Fair Values Of Significant Financial Instruments) (Detail) - USD ($)
$ in Thousands
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2017
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]            
Debt Securities, Held-to-maturity $ 4,636,707   $ 4,325,420      
Debt Securities, Held-to-maturity, Fair Value 4,674,510   4,209,121      
Mortgage servicing assets, Carrying Amount 18,712 $ 19,785 21,215 $ 23,341 $ 24,403 $ 25,139
Fair Value, Nonrecurring [Member] | Reported Value Measurement [Member]            
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]            
Debt Securities, Held-to-maturity 4,636,707   4,325,420      
Loans and leases, net 19,058,212   18,253,136      
Securities sold under agreements to repurchase and other borrowings 956,920   581,874      
FHLB advances [1] 1,426,656   1,826,808      
Long-term debt [1] 538,379   226,021      
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]            
Deposits 19,265,785   18,662,299      
Fair Value, Nonrecurring [Member] | Reported Value Measurement [Member] | Time Deposits [Member]            
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]            
Deposits 3,332,993   3,196,546      
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 18,712   21,215      
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 4,674,510   4,209,121      
Securities sold under agreements to repurchase and other borrowings 954,844   581,874      
FHLB advances [1] 1,429,684   1,826,381      
Long-term debt [1] 553,287   229,306      
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 19,184,264   18,155,798      
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]            
Deposits 19,265,785   18,662,299      
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]            
Deposits 3,334,113   3,175,948      
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 $ 36,572   $ 45,478      
[1] djustments to the carrying amount of long-term debt for unamortized discount and debt issuance cost on senior fixed-rate notes are not included for determination of fair value, see Note 8: Borrowings.