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Investments - Cost or Amortized Cost and Fair Value of Securities Available for Sale (Details) - USD ($) $ in Thousands	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	$ 1,152,852	$ 1,061,192
Allowance for Expected Credit Losses	(920)	(489)	$ (186)
Gross Unrealized Gains	278	1,129
Gross Unrealized Losses	(137,584)	(21,377)
Fair Value	1,014,626	1,040,455
U.S. government obligations and agencies
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	12,602	27,076
Allowance for Expected Credit Losses	0	0
Gross Unrealized Gains	0	64
Gross Unrealized Losses	(938)	(334)
Fair Value	11,664	26,806
Corporate bonds
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	788,737	687,058
Allowance for Expected Credit Losses	(729)	(371)
Gross Unrealized Gains	130	843
Gross Unrealized Losses	(93,077)	(13,725)
Fair Value	695,061	673,805
Mortgage-backed and asset-backed securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	327,166	322,844
Allowance for Expected Credit Losses	0	0
Gross Unrealized Gains	148	194
Gross Unrealized Losses	(39,707)	(6,920)
Fair Value	287,607	316,118
Municipal bonds
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	14,924	14,925
Allowance for Expected Credit Losses	(2)	(1)
Gross Unrealized Gains	0	0
Gross Unrealized Losses	(2,551)	(350)
Fair Value	12,371	14,574
Redeemable preferred stock
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	9,423	9,289
Allowance for Expected Credit Losses	(189)	(117)	$ (38)
Gross Unrealized Gains	0	28
Gross Unrealized Losses	(1,311)	(48)
Fair Value	$ 7,923	$ 9,152

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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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