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Investments - Cost or Amortized Cost and Fair Value of Securities Available for Sale (Details) - USD ($) $ in Thousands	Jun. 30, 2024	Dec. 31, 2023	Dec. 31, 2022
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	$ 1,316,419	$ 1,162,919
Allowance for Expected Credit Losses	(716)	(566)	$ (920)
Gross Unrealized Gains	1,602	2,115
Gross Unrealized Losses	(101,675)	(100,138)
Fair Value	1,215,630	1,064,330
U.S. government obligations and agencies
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	22,350	23,886
Allowance for Expected Credit Losses	0	0
Gross Unrealized Gains	36	49
Gross Unrealized Losses	(794)	(677)
Fair Value	21,592	23,258
Corporate bonds
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	888,118	779,177
Allowance for Expected Credit Losses	(617)	(469)
Gross Unrealized Gains	533	1,097
Gross Unrealized Losses	(64,038)	(64,091)
Fair Value	823,996	715,714
Mortgage-backed and asset-backed securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	380,581	334,460
Allowance for Expected Credit Losses	0	0
Gross Unrealized Gains	1,029	969
Gross Unrealized Losses	(34,479)	(32,283)
Fair Value	347,131	303,146
Municipal bonds
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	15,890	15,916
Allowance for Expected Credit Losses	(4)	(4)
Gross Unrealized Gains	0	0
Gross Unrealized Losses	(1,760)	(1,873)
Fair Value	14,126	14,039
Redeemable preferred stock
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	9,480	9,480
Allowance for Expected Credit Losses	(95)	(93)	$ (189)
Gross Unrealized Gains	4	0
Gross Unrealized Losses	(604)	(1,214)
Fair Value	$ 8,785	$ 8,173

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