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LOANS AND ALLOWANCE FOR LOAN LOSSES (Narrative) (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | ---
Sep. 30, 2020 | Sep. 30, 2020 | Jun. 30, 2020 | Jan. 01, 2020 | Dec. 31, 2019 | Sep. 30, 2019 | Dec. 31, 2018
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Nonaccrual loans | $ 39,023 | $ 39,023 |  | $ 45,204 | $ 28,232 |  |
Nonaccrual interest income | 0 | $ 0 |  |  |  |  |
Period for restructured loan to be considered default |  | 90 days |  |  |  |  |
Acquired performing loan portfolio | 14,383,215 | $ 14,383,215 |  |  | 12,610,936 |  |
Allowance for credit losses on loans | 174,122 | 174,122 | $ 169,977 | 89,778 | 42,294 | $ 43,820 | $ 41,045
Troubled Debt Restructurings (TDRs) | 21,560 | 21,560 |  |  | 19,496 |  |
Total Allowance for credit losses | 174,122 | 174,122 |  | $ 94,838 | 42,294 |  |
Loans, recorded investment under the Cares Act | 14,209,093 | 14,209,093 |  |  | 12,568,642 |  |
Troubled Debt Restructurings [Member] |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Troubled Debt Restructurings (TDRs) | 21,600 | 21,600 |  |  |  |  |
Total Allowance for credit losses | 2,700 | 2,700 |  |  |  |  |
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 | 68,800 | 68,800 |  |  | 86,681 |  |
Allowance for credit losses on loans | 4,700 | 4,700 |  |  | 217 |  |
Purchased impaired loans (gross) |  |  |  |  | $ 104,900 |  |
Paycheck Protection Program (PPP) |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Loans, recorded investment under the Cares Act | $ 769,600 | $ 769,600 |  |  |  |  |

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