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Fair Value - Financial Instruments not Required to be Carried at Fair Value (Details) - USD ($)
$ in Thousands
Sep. 30, 2025
Dec. 31, 2024
Financial assets:    
Investment securities held-to-maturity $ 3,209,883 $ 3,262,509
Lease and lease commitments excluded    
Financing leases 444,300 434,700
Deposit liabilities with no defined or contractual maturity 17,300,000 17,000,000
Book Value    
Financial assets:    
Cash and cash equivalents 1,855,643 1,170,190
Investment securities held-to-maturity 3,594,188 3,790,650
Loans held for sale 468  
Loans 13,685,103 13,973,608
Financial liabilities:    
Time deposits 3,381,635 3,298,370
Short-term borrowings   250,000
Estimated Fair Value    
Financial assets:    
Cash and cash equivalents 1,855,643 1,170,190
Investment securities held-to-maturity 3,209,883 3,262,509
Loans held for sale 469  
Loans 13,263,034 13,373,785
Financial liabilities:    
Time deposits 3,364,683 3,280,119
Short-term borrowings   249,312
Estimated Fair Value | Quoted Prices in Active Markets for Identical Assets (Level 1)    
Financial assets:    
Cash and cash equivalents 249,563 258,057
Estimated Fair Value | Significant Other Observable Inputs (Level 2)    
Financial assets:    
Cash and cash equivalents 1,606,080 912,133
Investment securities held-to-maturity 3,209,883 3,262,509
Loans held for sale 469  
Financial liabilities:    
Time deposits 3,364,683 3,280,119
Short-term borrowings   249,312
Estimated Fair Value | Significant Unobservable Inputs (Level 3)    
Financial assets:    
Loans $ 13,263,034 $ 13,373,785