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Financial Instruments Owned and Pledged as Collateral at Fair Value, Securities Purchased Under Agreements to Resell and Securities Sold Under Agreements to Repurchase - Summary of Assets, Liabilities and Collateral Received or Pledged (Details) - USD ($)
$ in Thousands
Mar. 31, 2020
Dec. 31, 2019
Financial Instruments Owned and Pledged as Collateral [Line Items]    
Financial Instruments Owned and Pledged as Collateral at Fair Value $ 20,422 $ 12,431
Securities Purchased Under Agreements to Resell 0 13,566
Securities Sold Under Agreements to Repurchase (20,422) (26,000)
Asset (Liability) Balance [Member]    
Financial Instruments Owned and Pledged as Collateral [Line Items]    
Financial Instruments Owned and Pledged as Collateral at Fair Value 20,422 12,431
Securities Purchased Under Agreements to Resell 0 13,566
Total Assets 20,422 25,997
Securities Sold Under Agreements to Repurchase (20,422) (26,000)
Market Value of Collateral Received or (Pledged) [Member]    
Financial Instruments Owned and Pledged as Collateral [Line Items]    
Securities Purchased Under Agreements to Resell 0 13,572
Securities Sold Under Agreements to Repurchase $ (20,421) $ (25,992)