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LOANS AND ALLOWANCE FOR LOAN LOSSES (Narrative) (Details) - USD ($) $ in Thousands | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Jan. 01, 2020 | Dec. 31, 2017
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Nonaccrual loans | $ 42,448 | $ 28,232 | $ 27,000 | $ 45,204 |
Nonaccrual interest income | $ 0 | 1,800 | 2,300 |  |
Period for restructured loan to be considered default | 90 days |  |  |  |
Acquired performing loan portfolio | $ 14,021,314 | 12,610,936 |  |  |
Allowance for credit losses on loans | 160,540 | 42,294 | $ 41,045 | 89,778 | $ 38,208
Troubled Debt Restructurings (TDRs) | 20,616 | 19,496 |  |  |
Total Allowance for credit losses | 160,540 | 42,294 |  | $ 94,838 |
Loans, recorded investment under the Cares Act | 13,860,774 | 12,568,642 |  |  |
Troubled Debt Restructurings [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Troubled Debt Restructurings (TDRs) | 20,600 |  |  |  |
Total Allowance for credit losses | 1,600 |  |  |  |
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 |  | 86,681 |  |  |
Allowance for credit losses on loans |  | 217 |  |  |
Purchased impaired loans (gross) |  | $ 104,900 |  |  |
Paycheck Protection Program (PPP) |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Loans under modified terms | $ 146,100 |  |  |  |

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