Commitments and Contingencies - Additional Information (Details)		1 Months Ended	12 Months Ended
	May 28, 2021	Jun. 30, 2021 USD ($)	Dec. 31, 2021 USD ($) contract swap	Dec. 31, 2020 USD ($)	Dec. 31, 2019 USD ($)
Commitments And Contingencies [Line Items]
Subordinated notes, interest rate	3.00%
Aggregate fair value of net liability position			$ 44,200,000
Derivatives designated as hedging instruments:
Commitments And Contingencies [Line Items]
Notional amount			1,000,000,000	$ 1,100,000,000
Derivatives not designated as hedging instruments:
Commitments And Contingencies [Line Items]
Notional amount			10,301,772,000	9,211,043,000
Derivative—interest rate swaps:
Commitments And Contingencies [Line Items]
Notional amount		$ 300,000,000
Accumulated net after-tax losses related to effective cash flow hedges			1,300,000	3,900,000
Reclassified to interest expense			1,100,000
Derivative—interest rate swaps: | Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate
Commitments And Contingencies [Line Items]
Annual interest rate spread, percentage		2.187%
Derivative—interest rate swaps: | Fair value hedge | Non-interest income
Commitments And Contingencies [Line Items]
Fee income			$ 26,900,000	59,000,000	$ 33,400,000
Derivative—interest rate swaps: | Derivatives designated as hedging instruments: | Cash flow hedge
Commitments And Contingencies [Line Items]
Number of derivative instruments | contract			6
Notional amount			$ 700,000,000
Derivative—interest rate swaps: | Derivatives designated as hedging instruments: | Cash flow hedge | Minimum
Commitments And Contingencies [Line Items]
Fixed interest rate			0.05%
Derivative—interest rate swaps: | Derivatives designated as hedging instruments: | Cash flow hedge | Maximum
Commitments And Contingencies [Line Items]
Fixed interest rate			0.63%
Derivative—interest rate swaps: | Derivatives designated as hedging instruments: | Fair value hedge
Commitments And Contingencies [Line Items]
Notional amount			$ 300,000,000	0
Derivative—interest rate swaps: | Derivatives not designated as hedging instruments:
Commitments And Contingencies [Line Items]
Number of derivative instruments | swap			24
Notional amount			$ 10,301,460,000	$ 8,889,557,000
Derivative—interest rate swaps: | Derivatives not designated as hedging instruments: | Risk Participation
Commitments And Contingencies [Line Items]
Notional amount			$ 232,800,000
Derivative—interest rate swaps: | Derivatives not designated as hedging instruments: | Fair value hedge
Commitments And Contingencies [Line Items]
Number of derivative instruments | swap			2
Notional amount			$ 10,400,000