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Fair Value Measurements (Carrying Value and Fair Value of Financial Instruments) (Details) - USD ($)
$ in Thousands
Jun. 30, 2025
Dec. 31, 2024
Assets:    
Investment securities $ 9,401,071 $ 9,130,244
Non-marketable equity securities 174,234 206,297
Liabilities:    
Time deposits 3,778,234 4,301,289
Fair Value, Inputs, Level 1    
Assets:    
Cash and cash equivalents 801,294 491,116
Fair Value, Inputs, Level 2    
Assets:    
Non-marketable equity securities $ 174,234 $ 206,297
Derivative Asset, Statement of Financial Position [Extensible Enumeration] Other assets Other assets
Liabilities:    
Demand, savings and money market deposits $ 24,867,707 $ 23,564,414
Time deposits 3,764,013 4,279,475
FHLB advances 2,255,007 2,929,896
Notes and other borrowings $ 703,480 $ 695,457
Derivative liabilities Other liabilities Other liabilities
Fair Value, Inputs, Level 3    
Assets:    
Loans, net $ 22,737,419 $ 23,053,011
Carrying Value    
Assets:    
Cash and cash equivalents 801,294 491,116
Investment securities 9,401,071 9,130,244
Non-marketable equity securities 174,234 206,297
Loans, net $ 23,710,797 $ 24,074,827
Derivative Asset, Statement of Financial Position [Extensible Enumeration] Other assets Other assets
Liabilities:    
Demand, savings and money market deposits $ 24,867,707 $ 23,564,414
Time deposits 3,778,234 4,301,289
FHLB advances 2,255,000 2,930,000
Notes and other borrowings $ 708,937 $ 708,553
Derivative liabilities Other liabilities Other liabilities