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Fair Value Measurements (Summary Of Estimated Fair Values Of Significant Financial Instruments) (Detail) - USD ($)
$ in Thousands
Jun. 30, 2022
Mar. 31, 2022
Dec. 31, 2021
Jun. 30, 2021
Mar. 31, 2021
Dec. 31, 2020
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]            
Fair Value $ 6,008,849   $ 6,280,936      
Mortgage servicing assets, Carrying Amount 8,592 $ 9,735 9,237 $ 11,501 $ 12,327 $ 13,422
Fair Value, Nonrecurring | Reported Value Measurement            
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]            
Cash and cash equivalents 901,805   461,570      
Held-to-maturity investment securities 6,547,998   6,198,125      
Loans and leases, net 45,075,244   21,970,542      
Securities sold under agreements to repurchase and other borrowings 1,743,782   674,896      
FHLB advances 2,510,810   10,997      
Long-term debt 1,076,559   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 50,523,055   28,049,259      
Fair Value, Nonrecurring | Reported Value Measurement | Time Deposits            
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]            
Time deposits 2,554,102   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 8,592   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 901,805   461,570      
Fair Value, Nonrecurring | Estimate of Fair Value Measurement | Level 2            
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]            
Fair Value 6,008,849   6,280,936      
Securities sold under agreements to repurchase and other borrowings 1,716,119   676,581      
FHLB advances 2,509,642   11,490      
Long-term debt 995,476   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 44,259,548   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 50,523,055   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 2,503,875   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 $ 28,125   $ 12,527