Fair Value of Financial Instruments - Amortized Cost Basis by Year of Origination and Credit Quality Indicator (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Financing Receivable, Credit Quality Indicator [Line Items]
2021	$ 5,245
2020	17,076
2019	24,880
Total	47,201	$ 47,690
Current-period write-offs	0
Current-period recoveries	0
Current-period net write-offs	0
1-2 internal grade
Financing Receivable, Credit Quality Indicator [Line Items]
2021	5,245
2020	8,580
2019	18,292
Total	32,117
3-4 internal grade
Financing Receivable, Credit Quality Indicator [Line Items]
2021	0
2020	8,496
2019	6,588
Total	15,084
5 internal grade
Financing Receivable, Credit Quality Indicator [Line Items]
2021	0
2020	0
2019	0
Total	0
6 internal grade
Financing Receivable, Credit Quality Indicator [Line Items]
2021	0
2020	0
2019	0
Total	0
7 internal grade
Financing Receivable, Credit Quality Indicator [Line Items]
2021	0
2020	0
2019	0
Total	$ 0