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Fair Value Measurements (Summary Of Estimated Fair Values Of Significant Financial Instruments) (Detail) - USD ($)
$ in Thousands
Jun. 30, 2020
Mar. 31, 2020
Dec. 31, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2018
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]            
Investment securities held-to-maturity, net $ 5,477,126   $ 5,293,918      
Debt Securities, Held-to-maturity, Fair Value 5,745,559   5,380,653      
Mortgage servicing assets, Carrying Amount 14,926 $ 16,391 17,484 $ 18,712 $ 19,785 $ 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 5,476,817   5,293,918      
Loans and leases, net 21,443,995   19,827,890      
Securities sold under agreements to repurchase and other borrowings 1,688,805   1,040,431      
FHLB advances 523,321   1,948,476      
Long-term debt 570,029   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 23,689,950   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 2,666,047   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 14,926   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 5,745,559   5,380,653      
Securities sold under agreements to repurchase and other borrowings 1,693,184   1,041,042      
FHLB advances 533,955   1,950,035      
Long-term debt 519,613   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 21,595,513   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 23,689,950   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 2,678,763   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 $ 18,326   $ 33,250