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Investment Securities - Additional Information (Detail)
$ in Thousands
 1 Months Ended 3 Months Ended 6 Months Ended
Jun. 30, 2022
USD ($)
assetBackedSecurity
contract
security
Jun. 30, 2021
USD ($)
Jun. 30, 2022
USD ($)
assetBackedSecurity
contract
security
Jun. 30, 2021
USD ($)
Jun. 30, 2022
USD ($)
assetBackedSecurity
contract
security
Jun. 30, 2021
USD ($)
Dec. 31, 2021
USD ($)
security
Investments, Debt and Equity Securities [Abstract]              
Proceed from sales of foreign subsidiaries   $ 3,800     $ 0 $ 3,765  
Loss on sale of foreign subsidiaries   $ 2,800 $ 0 $ 2,840 0 2,840  
Unrealized gain on investment securities       1,700   2,700  
Proceeds from sales of investment securities available for sale     $ 399,000 $ 53,700 $ 554,965 407,587  
Number of available-for-sale investment securities, unrealized loss position, less than twelve month category | security 140   140   140    
Number of available-for-sale investment securities, unrealized loss position, twelve month or more category | contract 7   7   7    
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
Debt Securities, Available-for-sale [Line Items]              
Transfer of investment securities available for sale to held to maturity $ 500,200       $ 500,174 $ 0  
Unrealized losses recorded in AOCI upon transfer to held to maturity 50,000            
Asset Pledged as Collateral              
Debt Securities, Available-for-sale [Line Items]              
Debt securities $ 19,300   $ 19,300   $ 19,300   $ 11,300