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Fair Value of Financial Instruments - Rollforward of Level 3 Assets Measured on Recurring Basis (Details) - Fair Value, Recurring Measurements [Member] - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2022
Jun. 30, 2021
Jun. 30, 2022
Jun. 30, 2021
Fair Value Assets Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]        
Level 3 assets, beginning of period $ 10,689 $ 4,177 $ 3,596 [1] $ 2,047 [1]
Net unrealized gains (losses) included in other comprehensive income 108   106 [1]  
Realized gains (losses) and accretion (amortization) recognized in earnings 7 (150) (200) [1] (234) [1]
Purchases 1,588 999 7,491 [1] 999 [1]
Settlements (1,400) (2,190) (1,400) [1] (2,190) [1]
Transfers into Level 3   500 1,399 [1] 2,714 [1]
Transfers out of Level 3 (9,358)   (9,358) [1]  
Level 3 assets, end of period [1] $ 1,634 $ 3,336 $ 1,634 $ 3,336
[1]

Activities for investments that enter and exit Level 3 in different quarters within the same fiscal year are not eliminated until the full year amounts are presented.