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Fair Value Measurements (Summary Of Estimated Fair Values Of Significant Financial Instruments) (Detail) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Reported Value Measurement [Member] | Fair Value, Nonrecurring [Member]        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Investment securities held-to-maturity (fair value of $5,835,364 and $5,380,653) $ 5,567,889 $ 5,293,918    
Loans and leases, net 21,281,784 19,827,890    
Securities sold under agreements to repurchase and other borrowings 995,355 1,040,431    
FHLB advances 133,164 1,948,476    
Long-term debt 567,663 540,364    
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 24,847,618 20,219,981    
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 2,487,818 3,104,765    
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 13,422 17,484    
Investment securities held-to-maturity (fair value of $5,835,364 and $5,380,653) 5,568,188 5,293,918    
Debt Securities, Held-to-maturity, Fair Value 5,835,364 5,380,653    
Loans Held-for-sale, Fair Value Disclosure 14,000 35,750    
Mortgage servicing assets, Carrying Amount 13,422 17,484 $ 21,215 $ 25,139
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 5,835,364 5,380,653    
Securities sold under agreements to repurchase and other borrowings 1,000,189 1,041,042    
FHLB advances 139,035 1,950,035    
Long-term debt 538,407 555,775    
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 24,847,618 20,219,981    
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 2,494,601 3,102,316    
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 21,413,397 19,961,632    
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 $ 14,362 $ 33,250