Investments - Contractual Maturities of Available for Sale Fixed Maturity Securities (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Amortized Cost
Due within one year	$ 21,435
Due after one year through five years	133,235
Due after five years through ten years	113,264
Due after ten years	47,228
Mortgage and asset-backed securities	110,960
Amortized Cost	426,122	$ 381,279
Fair Value
Due within one year	21,550
Due after one year through five years	134,946
Due after five years through ten years	115,897
Due after ten years	48,415
Mortgage and asset-backed securities	111,874
Fair Value	$ 432,682	$ 397,987

Amortized cost of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), with single maturity date and allocated without single maturity date, maturing in sixth through tenth fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).

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