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Fair Value Measurements (Summary Of Estimated Fair Values Of Significant Financial Instruments) (Detail) - USD ($)
$ in Thousands
Jun. 30, 2023
Mar. 31, 2023
Dec. 31, 2022
Jun. 30, 2022
Mar. 31, 2022
Dec. 31, 2021
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]            
Fair Value $ 6,066,682   $ 5,761,453      
Mortgage servicing assets, Carrying Amount 8,858 $ 9,189 9,515 $ 8,592 $ 9,735 $ 9,237
Fair Value, Nonrecurring | Reported Value Measurement            
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]            
Cash and cash equivalents 1,360,759   839,943      
Held-to-maturity investment securities 6,943,784   6,564,697      
Loans and leases, net 50,997,137   49,169,685      
Securities sold under agreements to repurchase and other borrowings 243,580   1,151,830      
FHLB advances 4,310,371   5,460,552      
Long-term debt 1,052,258   1,073,128      
Fair Value, Nonrecurring | Reported Value Measurement | Deposits Liabilities, other than time deposits            
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]            
Time deposits 51,461,474   49,893,391      
Fair Value, Nonrecurring | Reported Value Measurement | Time Deposits            
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]            
Time deposits 7,286,058   4,160,949      
Fair Value, Nonrecurring | Reported Value Measurement | Residential            
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]            
Mortgage servicing assets, Carrying Amount 8,858   9,515      
Fair Value, Nonrecurring | Estimate of Fair Value Measurement | Level 1            
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]            
Cash and cash equivalents 1,360,759   839,943      
Fair Value, Nonrecurring | Estimate of Fair Value Measurement | Level 2            
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]            
Fair Value 6,066,682   5,761,453      
Securities sold under agreements to repurchase and other borrowings 243,548   1,151,797      
FHLB advances 4,310,259   5,459,218      
Long-term debt 971,751   1,001,779      
Fair Value, Nonrecurring | Estimate of Fair Value Measurement | Level 3            
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]            
Loans and leases, net 49,027,570   47,604,463      
Fair Value, Nonrecurring | Estimate of Fair Value Measurement | Deposits Liabilities, other than time deposits | Level 2            
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]            
Time deposits 51,461,474   49,893,391      
Fair Value, Nonrecurring | Estimate of Fair Value Measurement | Time Deposits | Level 2            
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]            
Time deposits 7,189,837   4,091,979      
Fair Value, Nonrecurring | Estimate of Fair Value Measurement | Residential | Level 3            
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]            
Mortgage servicing assets, Fair value $ 25,520   $ 27,043