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Investments - Schedule of Available-for-sale Securities, at Fair Value (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020	Sep. 30, 2020	Dec. 31, 2019
Debt Securities, Available-for-sale [Line Items]
Amortized cost	$ 539,678	$ 369,751
Allowance for Credit Losses	(84)	0	$ (10)	$ 0
Gross unrealized gains	5,526	9,541
Gross unrealized losses	(3,999)	(2,159)
Fair value	541,121	377,133
U.S. Treasury securities and obligations of U.S. government authorities and agencies
Debt Securities, Available-for-sale [Line Items]
Amortized cost	303,340	191,116
Allowance for Credit Losses	0	0
Gross unrealized gains	3,128	5,245
Gross unrealized losses	(1,221)	(58)
Fair value	305,247	196,303
Obligations of state and political subdivisions
Debt Securities, Available-for-sale [Line Items]
Amortized cost	54,524	42,583
Allowance for Credit Losses	0	0	0	0
Gross unrealized gains	1,308	1,768
Gross unrealized losses	(214)	(1)
Fair value	55,618	44,350
Corporate securities
Debt Securities, Available-for-sale [Line Items]
Amortized cost	142,153	92,761
Allowance for Credit Losses	(80)	0	(10)	0
Gross unrealized gains	946	2,181
Gross unrealized losses	(483)	(1)
Fair value	142,536	94,941
Asset backed securities
Debt Securities, Available-for-sale [Line Items]
Amortized cost	36,151	37,975
Allowance for Credit Losses	0	0	0	0
Gross unrealized gains	138	316
Gross unrealized losses	(2,047)	(2,099)
Fair value	34,242	36,192
Certificates of deposit
Debt Securities, Available-for-sale [Line Items]
Amortized cost	856	1,355
Allowance for Credit Losses	0	0
Gross unrealized gains	0	0
Gross unrealized losses	0	0
Fair value	856	1,355
Obligations of foreign governments
Debt Securities, Available-for-sale [Line Items]
Amortized cost	2,654	3,961
Allowance for Credit Losses	(4)	0	$ 0	$ 0
Gross unrealized gains	6	31
Gross unrealized losses	(34)	0
Fair value	$ 2,622	$ 3,992

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- Definition

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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