Commitments and Contingencies - Additional Information (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2024 USD ($) swap contract	Dec. 31, 2023 USD ($)	Dec. 31, 2022 USD ($)	Dec. 31, 2021 USD ($)	Jun. 30, 2024 USD ($)
Commitments And Contingencies [Line Items]
Notional amount	$ 19,865,937	$ 18,678,243
Subordinated notes, interest rate				3.00%
Loans	48,799,711	50,210,295
Consumer
Commitments And Contingencies [Line Items]
Loans	3,590,837	3,440,695
Consumer | Automobile
Commitments And Contingencies [Line Items]
Loans	1,901,065	1,620,389
Derivatives designated as hedging instruments:
Commitments And Contingencies [Line Items]
Notional amount	780,322	800,000
Derivatives not designated as hedging instruments:
Commitments And Contingencies [Line Items]
Notional amount	19,085,615	17,878,243
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	(1,200)	(2,100)
Interest rate cash flow hedge gain (loss) to be reclassified during next 12 months, net	1,100
Derivative—interest rate swaps: | Fair value hedge interest rate swaps | Non-interest income
Commitments And Contingencies [Line Items]
Fee income	$ 23,500	35,700	$ 48,800
Derivative—interest rate swaps: | Derivatives designated as hedging instruments:
Commitments And Contingencies [Line Items]
Number of derivative instruments | swap	11
Notional amount	$ 480,300
Derivative, notional amount, terminated	$ 500,000
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 derivative instruments | contract	6
Notional amount	$ 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	800,000
Derivative—interest rate swaps: | Derivatives not designated as hedging instruments:
Commitments And Contingencies [Line Items]
Number of derivative instruments | swap	58
Notional amount	$ 16,209,499	16,282,279
Derivative—interest rate swaps: | Derivatives not designated as hedging instruments: | Risk Participation
Commitments And Contingencies [Line Items]
Notional amount	$ 822,000
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	1,142,026	$ 0			$ 1,500,000
Derivative, cost of hedge	$ 6,800