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Investment Securities - Additional Information (Detail)
$ in Thousands
1 Months Ended 3 Months Ended 9 Months Ended
Sep. 30, 2022
USD ($)
security
assetBackedSecurity
contract
Jun. 30, 2021
USD ($)
Sep. 30, 2022
USD ($)
security
assetBackedSecurity
contract
Sep. 30, 2021
USD ($)
Sep. 30, 2022
USD ($)
security
assetBackedSecurity
contract
Sep. 30, 2021
USD ($)
Dec. 31, 2021
USD ($)
security
Debt Securities, Available-for-sale [Line Items]              
Proceed from sales of foreign subsidiaries   $ 3,800     $ 0 $ 3,765  
Loss on sale of foreign subsidiaries   $ 2,800 $ 0 $ 0 0 2,840  
Unrealized gain on investment securities           2,700  
Proceeds from sales of investment securities available for sale     $ 126,600 258,400 $ 681,633 666,023  
Number of available-for-sale investment securities, unrealized loss position, less than twelve month category | security 128   128   128    
Number of available-for-sale investment securities, unrealized loss position, twelve month or more category | contract 19   19   19    
Number of asset-backed securities with deterioration in future estimated cash flows | assetBackedSecurity 4   4   4    
Number of available-for-sale investment securities, unrealized loss position | security 147   147   147   117
Carrying value of consumer loans sold $ 521,800            
Loss on sale of loans 23,500   $ 23,400 $ (5,800) $ 19,700 $ (10,100)  
Debt securities, held-to-maturity, allowance for credit loss, excluding accrued interest 0   0   0    
Variable Interest Entity, Not Primary Beneficiary              
Debt Securities, Available-for-sale [Line Items]              
Asset-backed securities collateralized by loans sold 400,000   400,000   400,000    
Asset Pledged as Collateral              
Debt Securities, Available-for-sale [Line Items]              
Debt securities $ 17,500   $ 17,500   $ 17,500   $ 11,300