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Fair Value Measurements (Summary Of Estimated Fair Values Of Significant Financial Instruments) (Detail) - USD ($)
$ in Thousands
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Held to maturity securities $ 6,564,879 $ 6,198,339    
Debt Securities, Held-to-maturity, Fair Value 5,761,453 6,280,936    
Mortgage servicing assets, Carrying Amount 9,515 9,237 $ 13,422 $ 17,484
Reported Value Measurement [Member] | Fair Value, Nonrecurring [Member]        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Cash and cash equivalents 839,943 461,570    
Held to maturity securities 6,564,697 6,198,125    
Loans and leases, net 49,169,685 21,970,542    
Securities sold under agreements to repurchase and other borrowings 1,151,830 674,896    
FHLB advances 5,460,552 10,997    
Long-term debt 1,073,128 562,931    
Reported Value Measurement [Member] | Fair Value, Nonrecurring [Member] | Deposits other than time deposits [Member]        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Deposits 49,893,391 28,049,259    
Reported Value Measurement [Member] | Fair Value, Nonrecurring [Member] | Time Deposits [Member]        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Deposits 4,160,949 1,797,770    
Reported Value Measurement [Member] | Fair Value, Nonrecurring [Member] | Residential        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Mortgage servicing assets, Carrying Amount 9,515 9,237    
Fair Value, Inputs, Level 1 [Member] | Estimate of Fair Value Measurement [Member] | Fair Value, Nonrecurring [Member]        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Cash and cash equivalents 839,943 461,570    
Fair Value, Inputs, Level 2 [Member] | Estimate of Fair Value Measurement [Member] | Fair Value, Nonrecurring [Member]        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Debt Securities, Held-to-maturity, Fair Value 5,761,453 6,280,936    
Securities sold under agreements to repurchase and other borrowings 1,151,797 676,581    
FHLB advances 5,459,218 11,490    
Long-term debt 1,001,779 515,912    
Fair Value, Inputs, Level 2 [Member] | Estimate of Fair Value Measurement [Member] | Fair Value, Nonrecurring [Member] | Deposits other than time deposits [Member]        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Deposits 49,893,391 28,049,259    
Fair Value, Inputs, Level 2 [Member] | Estimate of Fair Value Measurement [Member] | Fair Value, Nonrecurring [Member] | Time Deposits [Member]        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Deposits 4,091,979 1,794,829    
Fair Value, Inputs, Level 3 [Member] | Estimate of Fair Value Measurement [Member] | Fair Value, Nonrecurring [Member]        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Loans and leases, net 47,604,463 21,702,732    
Fair Value, Inputs, Level 3 [Member] | Estimate of Fair Value Measurement [Member] | Fair Value, Nonrecurring [Member] | Residential        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Mortgage servicing assets $ 27,043 $ 12,527