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RECENTLY ADOPTED AND ISSUED ACCOUNTING STANDARDS - Additional Information (Details) - USD ($) $ in Thousands |  | 3 Months Ended |  |  |
--- | --- | --- | --- | --- | ---
Jan. 01, 2020 | Mar. 31, 2020 | Mar. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Financing Receivable, Allowance for Credit Losses, Effect of Change in Method | $ 61,505 | $ 61,505 |  |  |
Off-Balance Sheet, Credit Loss, Liability, Change in Method, Credit Loss Expense (Reversal) | 12,155 |  |  |  |
Deferred tax liability, Credit Loss, Change in Method, Credit Loss Expense (Reversal) | (16,778) |  |  |  |
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest |  |  |  | $ 2,282,070 | $ 2,247,705
Loans and Leases Receivable, Allowance | $ 119,155 | 143,885 | $ 169,923 | 175,679 | 57,650
Cumulative Effect, Period of Adoption, Adjustment [Member] |  |  |  |  |
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest |  |  |  |  | (56,882)
Retained earnings |  |  |  |  |
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest |  | $ 660,653 |  | 720,429 | 711,249
Retained earnings | Cumulative Effect, Period of Adoption, Adjustment [Member] |  |  |  |  |
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest |  |  |  | $ (56,900) | $ (56,882)

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