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Fair Value Measurements (Carrying Value and Fair Value of Financial Instruments) (Details) - USD ($)
$ in Thousands
Sep. 30, 2025
Dec. 31, 2024
Carrying Value    
Assets:    
Cash and cash equivalents $ 559,505 $ 491,116
Investment securities 9,467,082 9,130,244
Non-marketable equity securities 165,922 206,297
Loans, net 23,482,610 24,074,827
Derivative Asset 91,811 85,132
Liabilities:    
Demand, savings and money market deposits 25,171,591 23,564,414
Time deposits 3,446,696 4,301,289
FHLB advances 2,080,000 2,930,000
Notes and other borrowings 320,431 708,553
Derivative Liability 86,502 85,899
Investment securities 9,467,082 9,130,244
Non-marketable equity securities 165,922 206,297
Time deposits 3,446,696 4,301,289
Fair Value, Inputs, Level 1    
Assets:    
Cash and cash equivalents 559,505 491,116
Fair Value, Inputs, Level 2    
Assets:    
Non-marketable equity securities 165,922 206,297
Derivative Asset 91,811 85,132
Liabilities:    
Demand, savings and money market deposits 25,171,591 23,564,414
Time deposits 3,438,593 4,279,475
FHLB advances 2,080,017 2,929,896
Notes and other borrowings 317,762 695,457
Derivative Liability 86,502 85,899
Fair Value, Inputs, Level 3    
Assets:    
Loans, net $ 22,919,819 $ 23,053,011