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Investments - Schedule of Available-for-sale Securities, at Fair Value (Details) - USD ($) $ in Thousands	Mar. 31, 2022	Dec. 31, 2021	Mar. 31, 2021	Dec. 31, 2020
Debt Securities, Available-for-sale [Line Items]
Amortized cost	$ 598,364	$ 581,064
Allowance for Credit Losses	(267)	(245)	$ (106)	$ 0
Gross unrealized gains	329	3,739
Gross unrealized losses	(29,966)	(7,110)
Fair value	568,460	577,448
U.S. Treasury securities and obligations of U.S. government authorities and agencies
Debt Securities, Available-for-sale [Line Items]
Amortized cost	355,764	352,288
Allowance for Credit Losses	0	0
Gross unrealized gains	74	2,087
Gross unrealized losses	(16,657)	(3,197)
Fair value	339,181	351,178
Obligations of state and political subdivisions
Debt Securities, Available-for-sale [Line Items]
Amortized cost	55,460	57,923
Allowance for Credit Losses	(1)	0	0	0
Gross unrealized gains	171	1,050
Gross unrealized losses	(2,459)	(313)
Fair value	53,171	58,660
Corporate securities
Debt Securities, Available-for-sale [Line Items]
Amortized cost	161,568	145,997
Allowance for Credit Losses	(263)	(241)	(101)	0
Gross unrealized gains	80	517
Gross unrealized losses	(7,972)	(1,396)
Fair value	153,413	144,877
Asset backed securities
Debt Securities, Available-for-sale [Line Items]
Amortized cost	20,231	19,511
Allowance for Credit Losses	0	0	0	0
Gross unrealized gains	4	82
Gross unrealized losses	(2,711)	(2,146)
Fair value	17,524	17,447
Certificates of deposit
Debt Securities, Available-for-sale [Line Items]
Amortized cost	2,696	2,696
Allowance for Credit Losses	0	0
Gross unrealized gains	0	0
Gross unrealized losses	0	0
Fair value	2,696	2,696
Obligations of foreign governments
Debt Securities, Available-for-sale [Line Items]
Amortized cost	2,645	2,649
Allowance for Credit Losses	(3)	(4)	$ (5)	$ 0
Gross unrealized gains	0	3
Gross unrealized losses	(167)	(58)
Fair value	$ 2,475	$ 2,590

X

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Amount, before tax, of unrealized gain in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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