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Investments - Schedule of Available-for-sale Securities, at Fair Value (Details) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020	Mar. 31, 2020	Dec. 31, 2019
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	$ 406,669	$ 369,751
Allowance for Credit Losses	(106)	0	$ (19)	$ 0
Gross unrealized gains	7,097	9,541
Gross unrealized losses	(3,713)	(2,159)
Fair value	409,947	377,133
U.S. Treasury securities and obligations of U.S. government authorities and agencies
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	206,825	191,116
Allowance for Credit Losses	0	0
Gross unrealized gains	3,964	5,245
Gross unrealized losses	(1,054)	(58)
Fair value	209,735	196,303
Obligations of state and political subdivisions
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	45,924	42,583
Allowance for Credit Losses	0	0	0	0
Gross unrealized gains	1,483	1,768
Gross unrealized losses	(113)	(1)
Fair value	47,294	44,350
Corporate securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	107,785	92,761
Allowance for Credit Losses	(101)	0	(19)	0
Gross unrealized gains	1,424	2,181
Gross unrealized losses	(575)	(1)
Fair value	108,533	94,941
Asset backed securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	40,233	37,975
Allowance for Credit Losses	0	0	0	0
Gross unrealized gains	206	316
Gross unrealized losses	(1,917)	(2,099)
Fair value	38,522	36,192
Certificates of deposit
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	1,356	1,355
Allowance for Credit Losses	0	0
Gross unrealized gains	0	0
Gross unrealized losses	0	0
Fair value	1,356	1,355
Obligations of foreign governments
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	4,546	3,961
Allowance for Credit Losses	(5)	0	$ 0	$ 0
Gross unrealized gains	20	31
Gross unrealized losses	(54)	0
Fair value	$ 4,507	$ 3,992

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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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