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Fair Value Measurements (Summary Of Estimated Fair Values Of Significant Financial Instruments) (Detail) - USD ($)
$ in Thousands
Sep. 30, 2019
Jun. 30, 2019
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Dec. 31, 2017
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]            
Debt Securities, Held-to-maturity $ 5,193,521   $ 4,325,420      
Debt Securities, Held-to-maturity, Fair Value 5,285,705   4,209,121      
Mortgage servicing assets, Carrying Amount 17,877 $ 18,712 21,215 $ 22,644 $ 23,341 $ 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 5,193,521   4,325,420      
Loans and leases, net 19,342,494   18,253,136      
Securities sold under agreements to repurchase and other borrowings 1,210,692   581,874      
FHLB advances [1] 1,392,849   1,826,808      
Long-term debt [1] 549,158   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 20,025,100   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 3,255,565   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 17,877   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 5,285,705   4,209,121      
Securities sold under agreements to repurchase and other borrowings 1,207,411   581,874      
FHLB advances [1] 1,395,735   1,826,381      
Long-term debt [1] 557,956   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 19,602,007   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 20,025,100   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 3,255,994   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 $ 34,025   $ 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.