v3.26.1
Fair Value - Financial Instruments not Required to be Carried at Fair Value (Details) - USD ($)
$ in Thousands
Jun. 30, 2026
Dec. 31, 2025
Financial assets:    
Investment securities held-to-maturity $ 3,035,475 $ 3,188,775
Lease and lease commitments excluded    
Financing leases 450,500 441,900
Deposit liabilities with no defined or contractual maturity 16,900,000 17,100,000
Book Value    
Financial assets:    
Cash and cash equivalents 1,012,496 1,477,752
Investment securities held-to-maturity 3,411,684 3,533,082
Loans held for sale   1,370
Loans 14,126,842 13,870,599
Financial liabilities:    
Time deposits 3,289,664 3,370,133
Estimated Fair Value    
Financial assets:    
Cash and cash equivalents 1,012,496 1,477,752
Investment securities held-to-maturity 3,035,475 3,188,775
Loans held for sale   1,376
Loans 13,629,349 13,356,550
Financial liabilities:    
Time deposits 3,273,300 3,356,533
Estimated Fair Value | Quoted Prices in Active Markets for Identical Assets (Level 1)    
Financial assets:    
Cash and cash equivalents 263,762 228,734
Estimated Fair Value | Significant Other Observable Inputs (Level 2)    
Financial assets:    
Cash and cash equivalents 748,734 1,249,018
Investment securities held-to-maturity 3,035,475 3,188,775
Loans held for sale   1,376
Financial liabilities:    
Time deposits 3,273,300 3,356,533
Estimated Fair Value | Significant Unobservable Inputs (Level 3)    
Financial assets:    
Loans $ 13,629,349 $ 13,356,550