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Variable Interest Entities - Additional Information - (Details) - USD ($)
$ in Thousands
Sep. 30, 2020
Dec. 31, 2019
Variable Interest Entity [Line Items]    
Securities - held to maturity, net carrying amount $ 6,096 $ 8,417
Collateralized Loan Obligation Funds    
Variable Interest Entity [Line Items]    
Securities - held to maturity, net carrying amount $ 6,096 $ 8,417