XML 93 R73.htm IDEA: XBRL DOCUMENT v3.20.4
Fair Value of Financial Instruments Fair Value of Financial Instruments - Summary of Changes in Fair Value of Instruments (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Beginning Balance $ 803 $ 686
Purchases and adjustments 261 131
Transfers/disbursements (1,065) 29
Investment income 27 15
Ending Balance $ 2,156 $ 803