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Fair Value Measurements (Summary Of Estimated Fair Values Of Significant Financial Instruments) (Detail) - USD ($)
$ in Thousands
Mar. 31, 2024
Dec. 31, 2023
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Fair Value $ 6,782,867 $ 6,264,623
Fair Value, Nonrecurring | Reported Value Measurement    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Cash and cash equivalents 1,545,228 1,715,795
Held-to-maturity investment securities, net 7,679,891 7,074,588
Loans and leases, net 50,457,200 50,090,315
Securities sold under agreements to repurchase and other borrowings 361,886 458,387
FHLB advances 3,659,930 2,360,018
Long-term debt 914,520 1,048,820
Fair Value, Nonrecurring | Reported Value Measurement | Deposits Liabilities, other than time deposits    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Time deposits 53,810,423 52,319,825
Fair Value, Nonrecurring | Reported Value Measurement | Time Deposits    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Time deposits 6,937,320 8,464,459
Fair Value, Nonrecurring | Reported Value Measurement | Residential    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Mortgage servicing assets, Carrying Amount 1,514 8,523
Fair Value, Nonrecurring | Estimate of Fair Value Measurement | Level 1    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Cash and cash equivalents 1,545,228 1,715,795
Fair Value, Nonrecurring | Estimate of Fair Value Measurement | Level 2    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Fair Value 6,782,867 6,264,623
Securities sold under agreements to repurchase and other borrowings 361,867 458,380
FHLB advances 3,657,612 2,358,381
Long-term debt 852,877 999,918
Fair Value, Nonrecurring | Estimate of Fair Value Measurement | Level 3    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Loans and leases, net 48,348,067 48,048,106
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 53,810,423 52,319,825
Fair Value, Nonrecurring | Estimate of Fair Value Measurement | Time Deposits | Level 2    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Time deposits 6,902,736 8,426,708
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 $ 3,973 $ 24,495