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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Additional Information (Details) $ in Thousands |  | 3 Months Ended |  |
--- | --- | --- | --- | ---
Jan. 01, 2020 USD ($) | Mar. 31, 2020 USD ($) banking_office | Dec. 31, 2019 USD ($) | Mar. 31, 2019 USD ($)
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |
Number of banking offices | banking_office |  | 31 |  |
Total loans |  | $ 5,667,464 | $ 5,951,885 |
Net decrease in retained earnings | $ 4,503 | $ 4,503 |  | $ 0
Retained Earnings |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |
Net decrease in retained earnings | 4,503 |  |  |
Impact of ASC 326 Adoption |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |
Financing Receivable, Allowance for Credit Loss, Period Increase (Decrease) | 6,400 |  |  |
Impact of ASC 326 Adoption | Retained Earnings |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |
Net decrease in retained earnings | $ 4,500 |  |  |

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