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CUSTOMER FUNDS - Assets Underlying Customer Funds (Details) - USD ($) $ in Thousands | Sep. 30, 2021 | Dec. 31, 2020
--- | --- | ---
Debt Securities, Available-for-sale [Line Items] |  |
Customer funds | $ 2,649,114 | $ 2,037,832
Customer Funds In Transit |  |
Debt Securities, Available-for-sale [Line Items] |  |
Customer funds | 0 | 262,562
U.S. agency securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Customer funds | 53,563 | 113,178
U.S. government securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Customer funds | 412,261 | 333,346
Cash |  |
Debt Securities, Available-for-sale [Line Items] |  |
Customer funds | 162,247 | 145,577
Cash Equivalents | Money market funds |  |
Debt Securities, Available-for-sale [Line Items] |  |
Customer funds | 1,485,002 | 777,193
Cash Equivalents | Reverse repurchase agreement |  |
Debt Securities, Available-for-sale [Line Items] |  |
Customer funds | 402,097 | 246,880
Cash Equivalents | U.S. agency securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Customer funds | 0 | 47,300
Cash Equivalents | U.S. government securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Customer funds | $ 133,944 | $ 111,796

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