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Commitments and Contingencies - Additional Information (Details)
$ in Thousands
 12 Months Ended
Jun. 30, 2025
Jun. 15, 2025
Dec. 31, 2025
USD ($)
swap
Dec. 31, 2024
USD ($)
swap
Dec. 31, 2023
USD ($)
contract
Dec. 31, 2022
Dec. 31, 2021
USD ($)
Jan. 31, 2025
Commitments And Contingencies [Line Items]                
Notional amount     $ 22,489,009 $ 19,865,937        
Subordinated notes, interest rate 4.55% 5.25%         3.00%  
Loans     50,136,728 48,799,711        
Consumer                
Commitments And Contingencies [Line Items]                
Loans     4,105,035 3,590,837        
Consumer | Automobile                
Commitments And Contingencies [Line Items]                
Loans     2,184,600 1,901,065        
Derivatives designated as hedging instruments:                
Commitments And Contingencies [Line Items]                
Notional amount     780,322 780,322        
Derivatives not designated as hedging instruments:                
Commitments And Contingencies [Line Items]                
Notional amount     21,708,687 19,085,615        
Derivative - interest rate swaps:                
Commitments And Contingencies [Line Items]                
Notional amount             $ 300,000  
Annual interest rate spread, percentage           2.187%    
Accumulated net after-tax gain (loss) related to effective cash flow hedges     (420) (1,200)        
Interest rate cash flow hedge gain (loss) to be reclassified during next 12 months, net     581          
Derivative - interest rate swaps: | Fair value hedge interest rate swaps | Non-interest income                
Commitments And Contingencies [Line Items]                
Fee income     33,800 23,500 $ 35,700      
Derivative - interest rate swaps: | Derivatives designated as hedging instruments:                
Commitments And Contingencies [Line Items]                
Derivative, notional amount, terminated       $ 500,000        
Number of derivative instruments | swap       11        
Notional amount       $ 480,300        
Derivative - interest rate swaps: | Derivatives designated as hedging instruments: | Minimum                
Commitments And Contingencies [Line Items]                
Fixed interest rate               4.12%
Derivative - interest rate swaps: | Derivatives designated as hedging instruments: | Maximum                
Commitments And Contingencies [Line Items]                
Fixed interest rate               4.65%
Derivative - interest rate swaps: | Derivatives designated as hedging instruments: | Cash flow hedge interest rate swaps                
Commitments And Contingencies [Line Items]                
Number of instruments terminated | contract         6      
Derivative, notional amount, terminated         $ 600,000      
Derivative instrument pre-tax gain (loss)         $ 3,600      
Derivative - interest rate swaps: | Derivatives designated as hedging instruments: | Fair value hedge interest rate swaps                
Commitments And Contingencies [Line Items]                
Notional amount     $ 780,322 780,322        
Derivative - interest rate swaps: | Derivatives not designated as hedging instruments:                
Commitments And Contingencies [Line Items]                
Number of derivative instruments | swap     65          
Notional amount     $ 18,685,777 16,209,499        
Derivative - interest rate swaps: | Derivatives not designated as hedging instruments: | Risk Participation                
Commitments And Contingencies [Line Items]                
Notional amount     $ 959,900          
Derivative - interest rate swaps: | Derivatives not designated as hedging instruments: | Fair value hedge interest rate swaps                
Commitments And Contingencies [Line Items]                
Number of derivative instruments | swap     2          
Notional amount     $ 10,400          
Credit Default Swap | Derivatives not designated as hedging instruments:                
Commitments And Contingencies [Line Items]                
Notional amount     653,459 1,142,026        
Derivative liability, notional amount       1,500,000        
Gain (loss) on derivative instruments, net, pretax     $ 6,900 $ 6,800