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Fair Value - Available for Sale Debt Securities (Details) - Fair Value, Recurring [Member] - Fair Value, Inputs, Level 3 - Available for Sale Debt Securities
$ in Thousands
6 Months Ended
Jun. 30, 2020
USD ($)
Fair value on a recurring basis  
Balance at beginning of period $ 6,238
Unrealized 5
Balance at end of period $ 6,243