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Commitments and Contingencies - Years In Which Commitments are Expected to be Paid (Details) - USD ($)
$ in Thousands
Sep. 30, 2020
Dec. 31, 2019
Other Commitments [Line Items]    
Commitments to contribute capital to small business investment companies and CRA-related loan pools $ 52,941 $ 40,698
2020    
Other Commitments [Line Items]    
Commitments to contribute capital to small business investment companies and CRA-related loan pools 26,824  
2021    
Other Commitments [Line Items]    
Commitments to contribute capital to small business investment companies and CRA-related loan pools $ 26,117