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Fair Value Measurements (Summary Of Estimated Fair Values Of Significant Financial Instruments) (Detail) - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Reported Value Measurement [Member] | Fair Value, Nonrecurring [Member]        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Investment securities available-for-sale, at fair value $ 5,293,918 $ 4,325,420    
Loans and leases, net 19,827,890 18,253,136    
Securities sold under agreements to repurchase and other borrowings 1,040,431 581,874    
FHLB advances 1,948,476 1,826,808    
Long-term debt 540,364 226,021    
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 20,219,981 18,662,299    
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 3,104,765 3,196,546    
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 17,484 21,215    
Investment securities available-for-sale, at fair value 5,293,918 4,325,420    
Debt Securities, Held-to-maturity, Fair Value 5,380,653 4,209,121    
Loans Held-for-sale, Fair Value Disclosure 35,750 7,908    
Mortgage servicing assets, Carrying Amount 17,484 21,215 $ 25,139 $ 24,466
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 5,380,653 4,209,121    
Securities sold under agreements to repurchase and other borrowings 1,041,042 581,874    
FHLB advances 1,950,035 1,826,381    
Long-term debt 555,775 229,306    
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 20,219,981 18,662,299    
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 3,102,316 3,175,948    
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 19,961,632 18,155,798    
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 $ 33,250 $ 45,478