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Fair Value Measurements (Summary Of Estimated Fair Values Of Significant Financial Instruments) (Detail) - USD ($)
$ in Thousands
Mar. 31, 2022
Dec. 31, 2021
Mar. 31, 2021
Dec. 31, 2020
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Fair Value $ 6,091,617 $ 6,280,936    
Mortgage servicing assets, Carrying Amount 9,735 9,237 $ 12,327 $ 13,422
Fair Value, Nonrecurring | Reported Value Measurement        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Cash and cash equivalents 793,213 461,570    
Held-to-maturity investment securities 6,362,254 6,198,125    
Loans and leases, net 42,967,114 21,970,542    
Securities sold under agreements to repurchase and other borrowings 518,733 674,896    
FHLB advances 10,903 10,997    
Long-term debt 1,078,274 562,931    
Fair Value, Nonrecurring | Reported Value Measurement | Deposits Liabilities, other than time deposits        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Time deposits 51,535,186 28,049,259    
Fair Value, Nonrecurring | Reported Value Measurement | Time Deposits        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Time deposits 2,821,097 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 9,735 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 793,213 461,570    
Fair Value, Nonrecurring | Estimate of Fair Value Measurement | Level 2        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Fair Value 6,091,617 6,280,936    
Securities sold under agreements to repurchase and other borrowings 483,544 676,581    
FHLB advances 10,653 11,490    
Long-term debt 1,069,991 515,912    
Fair Value, Nonrecurring | Estimate of Fair Value Measurement | Level 3        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Loans and leases, net 43,217,955 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 51,535,186 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 2,785,621 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 $ 26,631 $ 12,527