INVESTMENTS - Schedule of Investment Securities (Details) - USD ($) $ in Thousands	Mar. 31, 2022	Dec. 31, 2021
Debt Securities, Available-for-sale [Line Items]
Cash equivalents, Amortized Cost	$ 586,011	$ 192,623
Cash equivalents, Gross Unrealized Gains	0	0
Cash equivalents, Gross Unrealized Losses	(41)	0
Cash equivalents, Carrying Value	585,970	192,623
Amortized Cost	1,367,082	742,222
Gross Unrealized Gains	211	694
Gross Unrealized Losses	(29,240)	(3,439)
Available for sale	1,338,053	739,477
Debt Securities, Held-to-maturity, Securities [Line Items]
Amortized Cost	8,502	9,186
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	0
Amortized Cost, Total investments	1,961,595	944,031
Gross Unrealized Gains, Total investments	211	694
Gross Unrealized Losses, Total investments	(29,281)	(3,439)
Carrying Value, Total investments	1,932,525	941,286
U.S. government and agency obligations
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	752,881	311,936
Gross Unrealized Gains	69	259
Gross Unrealized Losses	(7,366)	(2,200)
Available for sale	745,584	309,995
Debt Securities, Held-to-maturity, Securities [Line Items]
Amortized Cost	7,055	7,739
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	0
Corporate obligations
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	392,440	313,965
Gross Unrealized Gains	56	326
Gross Unrealized Losses	(15,316)	(1,104)
Available for sale	377,180	313,187
State and municipal obligations
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	18,654	16,122
Gross Unrealized Gains	2	33
Gross Unrealized Losses	(215)	(38)
Available for sale	18,441	16,117
Certificates of deposit
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	14,340	18,752
Gross Unrealized Gains	0	0
Gross Unrealized Losses	(2)	0
Available for sale	14,338	18,752
Debt Securities, Held-to-maturity, Securities [Line Items]
Amortized Cost	1,447	1,447
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	0
Mortgage-backed securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	126,271	38,558
Gross Unrealized Gains	75	63
Gross Unrealized Losses	(4,564)	(67)
Available for sale	121,782	38,554
Asset-backed securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	62,104
Gross Unrealized Gains	9
Gross Unrealized Losses	(1,766)
Available for sale	60,347
Other
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	392	42,889
Gross Unrealized Gains	0	13
Gross Unrealized Losses	(11)	(30)
Available for sale	$ 381	$ 42,872

Cash, Cash Equivalents, Available-For-Sale And Held-To-Maturity Securities

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