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SIGNIFICANT ACCOUNTING POLICIES - Recent Accounting Pronouncements (Details) - USD ($) $ in Millions | Jan. 01, 2020 | Mar. 31, 2020 | Dec. 31, 2019
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New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |
Allowance for loan loss |  | $ 137.9 | $ 20.1
2016-13 |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |
Allowance for loan loss | $ 37.4 |  |
Off-balance sheet credit loss, liability | 2.2 |  |
Cumulative effect on retained earnings | $ 39.6 |  |

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