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Fair Value Measurements (Summary Of Estimated Fair Values Of Significant Financial Instruments) (Detail) - USD ($)
$ in Thousands
Sep. 30, 2022
Jun. 30, 2022
Dec. 31, 2021
Sep. 30, 2021
Jun. 30, 2021
Dec. 31, 2020
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]            
Fair Value $ 5,650,119   $ 6,280,936      
Mortgage servicing assets, Carrying Amount 9,837 $ 8,592 9,237 $ 10,167 $ 11,501 $ 13,422
Fair Value, Nonrecurring | Reported Value Measurement            
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]            
Cash and cash equivalents 613,125   461,570      
Held-to-maturity investment securities 6,505,838   6,198,125      
Loans and leases, net 47,249,550   21,970,542      
Securities sold under agreements to repurchase and other borrowings 1,265,414   674,896      
FHLB advances 3,510,717   10,997      
Long-term debt 1,074,844   562,931      
Fair Value, Nonrecurring | Reported Value Measurement | Deposits Liabilities, other than time deposits            
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]            
Time deposits 51,439,293   28,049,259      
Fair Value, Nonrecurring | Reported Value Measurement | Time Deposits            
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]            
Time deposits 2,569,594   1,797,770      
Fair Value, Nonrecurring | Reported Value Measurement | Residential            
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]            
Mortgage servicing assets, Carrying Amount 9,837   9,237      
Fair Value, Nonrecurring | Estimate of Fair Value Measurement | Level 1            
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]            
Cash and cash equivalents 613,125   461,570      
Fair Value, Nonrecurring | Estimate of Fair Value Measurement | Level 2            
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]            
Fair Value 5,650,119   6,280,936      
Securities sold under agreements to repurchase and other borrowings 1,243,251   676,581      
FHLB advances 3,509,221   11,490      
Long-term debt 1,030,390   515,912      
Fair Value, Nonrecurring | Estimate of Fair Value Measurement | Level 3            
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]            
Loans and leases, net 45,896,000   21,702,732      
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 51,439,293   28,049,259      
Fair Value, Nonrecurring | Estimate of Fair Value Measurement | Time Deposits | Level 2            
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]            
Time deposits 2,503,396   1,794,829      
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 $ 27,550   $ 12,527