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Investments - Schedule of Credit Quality of Investment Securities With Contractual Maturities or The Issuer of Such Securities (Details) - USD ($) $ in Thousands	Jun. 30, 2020	Dec. 31, 2019
Debt Securities, Available-for-sale [Line Items]
Fair Value	$ 869,418	$ 855,284
Percentage of Total Fair Value	100.00%	100.00%
AAA [Member]
Debt Securities, Available-for-sale [Line Items]
Fair Value	$ 364,007	$ 372,442
Percentage of Total Fair Value	41.90%	43.60%
AA [Member]
Debt Securities, Available-for-sale [Line Items]
Fair Value	$ 100,331	$ 99,103
Percentage of Total Fair Value	11.50%	11.60%
A [Member]
Debt Securities, Available-for-sale [Line Items]
Fair Value	$ 249,591	$ 238,766
Percentage of Total Fair Value	28.70%	27.90%
BBB [Member]
Debt Securities, Available-for-sale [Line Items]
Fair Value	$ 151,828	$ 143,889
Percentage of Total Fair Value	17.50%	16.80%
BB and Below [Member]
Debt Securities, Available-for-sale [Line Items]
Fair Value	$ 1,234	$ 0
Percentage of Total Fair Value	0.10%	0.00%
Not Rated Available [Member]
Debt Securities, Available-for-sale [Line Items]
Fair Value	$ 2,427	$ 1,084
Percentage of Total Fair Value	0.30%	0.10%

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