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Fair Value Measurements (Summary Of Estimated Fair Values Of Significant Financial Instruments) (Detail) - USD ($)
$ in Thousands
Sep. 30, 2020
Jun. 30, 2020
Dec. 31, 2019
Sep. 30, 2019
Jun. 30, 2019
Dec. 31, 2018
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]            
Investment securities held-to-maturity, net $ 5,723,434   $ 5,293,918      
Debt Securities, Held-to-maturity, Fair Value 6,006,416   5,380,653      
Mortgage servicing assets, Carrying Amount 14,408 $ 14,926 17,484 $ 17,877 $ 18,712 $ 21,215
Fair Value, Nonrecurring [Member] | Reported Value Measurement [Member]            
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]            
Investment securities held-to-maturity, net 5,723,128   5,293,918      
Loans and leases, net 21,482,212   19,827,890      
Securities sold under agreements to repurchase and other borrowings 1,301,822   1,040,431      
FHLB advances 433,243   1,948,476      
Long-term debt 568,846   540,364      
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]            
Time deposits 24,350,113   20,219,981      
Fair Value, Nonrecurring [Member] | Reported Value Measurement [Member] | Time Deposits [Member]            
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]            
Time deposits 2,570,440   3,104,765      
Fair Value, Nonrecurring [Member] | Reported Value Measurement [Member] | Residential            
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]            
Mortgage servicing assets, Carrying Amount 14,408   17,484      
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 6,006,416   5,380,653      
Securities sold under agreements to repurchase and other borrowings 1,305,029   1,041,042      
FHLB advances 442,724   1,950,035      
Long-term debt 525,170   555,775      
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 21,695,557   19,961,632      
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]            
Time deposits 24,350,113   20,219,981      
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]            
Time deposits 2,580,279   3,102,316      
Fair Value, Nonrecurring [Member] | Estimate of Fair Value Measurement [Member] | Residential | Significant Unobservable Inputs (Level 3) [Member]            
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]            
Mortgage servicing assets, Fair value $ 15,559   $ 33,250