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Fair Value of Financial Instruments - Loan participation interest Level 3 Roll Forward (Details) - Loan Participation Interest - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Beginning balance $ 54,981 $ 0
Purchases/Advances 7,962 54,981
Repayments (18,289) 0
Ending balance $ 44,654 $ 54,981