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Investment Securities - Narrative (Details)
$ in Thousands
1 Months Ended 12 Months Ended
Sep. 30, 2022
USD ($)
Jun. 30, 2022
USD ($)
Dec. 31, 2024
USD ($)
entity
security
position
Dec. 31, 2023
USD ($)
contract
security
entity
Dec. 31, 2022
USD ($)
Debt Securities, Available-for-sale [Line Items]          
Proceeds from sales of investment securities available for sale     $ 624,917 $ 297,417 $ 983,575
Number of available-for-sale investment securities in the less than twelve month category (security) | security     46    
Number of available-for-sale investment securities in the twelve month or more category (security) | security     71    
Number of available-for-sale investment securities, unrealized loss position | security     117 119  
AFS securities in nonaccrual status | position     0    
Accrued interest reversal     $ 2,500 $ 0 0
Debt securities, available for sale     1,985,438 2,376,860  
Transfer of investment securities available for sale to held to maturity   $ 500,200 0 0 500,174
Amortization of unrealized loss on securities transferred from available-for-sale to held-to-maturity   $ 50,000 5,247 4,986 0
Carrying value of consumer loans sold $ 521,800        
Loss on sale of loans         23,500
Investment securities held to maturity     991,937 $ 1,103,170  
Servicing asset, number Of VIE counterparties | contract       1  
Servicing asset     2,100 $ 3,800  
Debt securities, held-to-maturity, allowance for credit loss, excluding accrued interest     0 0  
Consumer Loan Held For Sale          
Debt Securities, Available-for-sale [Line Items]          
Loss on sale of loans     300 1,200  
Consumer Loan Held For Sale | Personal and Other Installment Loans          
Debt Securities, Available-for-sale [Line Items]          
Carrying value of consumer loans sold     $ 202,500 $ 556,700  
Number of VIEs sold | entity     2 2  
Consumer Loan Held For Sale | Other Installment Loans          
Debt Securities, Available-for-sale [Line Items]          
Sale of financing receivable     $ 53,000 $ 154,000  
Asset-backed securities          
Debt Securities, Available-for-sale [Line Items]          
Debt securities, available for sale     13,236 92,629  
Investment securities held to maturity     471,996 575,990  
Debt securities, held-to-maturity, allowance for credit loss, excluding accrued interest     $ 0 0  
Corporate notes          
Debt Securities, Available-for-sale [Line Items]          
Securities in nonaccrual status | position     1    
Debt securities, available for sale     $ 516,330 583,034  
Variable Interest Entity, Not Primary Beneficiary          
Debt Securities, Available-for-sale [Line Items]          
Investment securities held to maturity     160,000 436,800 $ 400,000
Asset Pledged as Collateral          
Debt Securities, Available-for-sale [Line Items]          
Debt securities, available for sale     1,300,000 1,200,000  
Pledged investment securities transferred from available for sale to held to maturity     $ 386,400 $ 398,400