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Fair Value Measurements (Summary Of Estimated Fair Values Of Significant Financial Instruments) (Detail) - USD ($)
$ in Thousands
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
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 $ 461,570 $ 263,104    
Held to maturity securities 6,198,125 5,567,889    
Loans and leases, net 21,970,542 21,281,784    
Securities sold under agreements to repurchase and other borrowings 674,896 995,355    
FHLB advances 10,997 133,164    
Long-term debt 562,931 567,663    
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 28,049,259 24,847,618    
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 1,797,770 2,487,818    
Reported Value Measurement [Member] | Fair Value, Nonrecurring [Member] | Residential Mortgage [Member]        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Mortgage servicing assets, Carrying Amount 9,237 13,422    
Held to maturity securities 6,198,339 5,568,188    
Debt Securities, Held-to-maturity, Fair Value 6,280,936 5,835,364    
Loans Held-for-sale, Fair Value Disclosure 4,694 14,000    
Mortgage servicing assets, Carrying Amount 9,237 13,422 $ 17,484 $ 21,215
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]        
Cash and cash equivalents 461,570 263,104    
Debt Securities, Held-to-maturity, Fair Value 6,280,936 5,835,364    
Securities sold under agreements to repurchase and other borrowings 676,581 1,000,189    
FHLB advances 11,490 139,035    
Long-term debt 515,912 538,407    
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 28,049,259 24,847,618    
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 1,794,829 2,494,601    
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 21,702,732 21,413,397    
Fair Value, Inputs, Level 3 [Member] | Estimate of Fair Value Measurement [Member] | Fair Value, Nonrecurring [Member] | Residential Mortgage [Member]        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Mortgage servicing assets $ 12,527 $ 14,362