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Investments - Cost or Amortized Cost and Fair Value of Securities Available for Sale (Details) - USD ($) $ in Thousands	Mar. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	$ 1,209,054	$ 1,162,919
Allowance for Expected Credit Losses	(600)	(566)	$ (920)
Gross Unrealized Gains	1,158	2,115
Gross Unrealized Losses	(102,554)	(100,138)
Fair Value	1,107,058	1,064,330
U.S. government obligations and agencies
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	22,434	23,886
Allowance for Expected Credit Losses	0	0
Gross Unrealized Gains	0	49
Gross Unrealized Losses	(781)	(677)
Fair Value	21,653	23,258
Corporate bonds
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	807,313	779,177
Allowance for Expected Credit Losses	(502)	(469)
Gross Unrealized Gains	646	1,097
Gross Unrealized Losses	(65,515)	(64,091)
Fair Value	741,942	715,714
Mortgage-backed and asset-backed securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	353,909	334,460
Allowance for Expected Credit Losses	0	0
Gross Unrealized Gains	509	969
Gross Unrealized Losses	(33,714)	(32,283)
Fair Value	320,704	303,146
Municipal bonds
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	15,918	15,916
Allowance for Expected Credit Losses	(5)	(4)
Gross Unrealized Gains	0	0
Gross Unrealized Losses	(1,821)	(1,873)
Fair Value	14,092	14,039
Redeemable preferred stock
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	9,480	9,480
Allowance for Expected Credit Losses	(93)	(93)	$ (189)
Gross Unrealized Gains	3	0
Gross Unrealized Losses	(723)	(1,214)
Fair Value	$ 8,667	$ 8,173

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