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LOANS AND ALLOWANCE FOR LOAN LOSSES (Narrative) (Details) - USD ($) $ in Thousands | 3 Months Ended |  |  |  |
--- | --- | --- | --- | --- | ---
Mar. 31, 2020 | Jan. 01, 2020 | Dec. 31, 2019 | Mar. 31, 2019 | Dec. 31, 2018
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Nonaccrual loans | $ 44,022 | $ 45,204 | $ 28,232 |  |
Nonaccrual interest income | $ 0 |  |  |  |
Period for restructured loan to be considered default | 90 days |  |  |  |
Acquired performing loan portfolio | $ 12,768,841 |  | 12,610,936 |  |
Allowance for credit losses on loans | 141,043 | 89,778 | 42,294 | $ 40,827 | $ 41,045
Troubled Debt Restructurings (TDRs) | 20,356 |  | 19,496 |  |
Total Allowance for credit losses | 141,043 | $ 94,838 | 42,294 |  |
Troubled Debt Restructurings [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Troubled Debt Restructurings (TDRs) | 20,400 |  |  |  |
Total Allowance for credit losses | 1,900 |  |  |  |
Acquired Performing Loan Portfolio |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Acquired performing loan portfolio |  |  | 3,000,000 |  |
Remaining discount on acquired loans |  |  | 50,100 |  |
Purchased Impaired |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Acquired performing loan portfolio | 84,700 |  | 86,681 |  |
Allowance for credit losses on loans | 3,800 |  | 217 |  |
Purchased impaired loans (gross) |  |  | $ 104,900 |  |
COVID-19 |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Troubled Debt Restructurings (TDRs) | $ 75,000 |  |  |  |

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