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ACCOUNTING POLICIES - New Accounting Standards (Illustration of the Impact of ASC 326) (Details) - USD ($) $ in Thousands | Sep. 30, 2020 | Jun. 30, 2020 | Jan. 01, 2020 | Dec. 31, 2019 | Sep. 30, 2019 | Dec. 31, 2018
--- | --- | --- | --- | --- | --- | ---
Item Effected [Line Items] |  |  |  |  |  |
Allowance for credit losses on loans | $ 174,122 | $ 169,977 | $ 89,778 | $ 42,294 | $ 43,820 | $ 41,045
Total Allowance for credit losses | 174,122 |  | 94,838 | 42,294 |  |
Previous Accounting Guidance |  |  |  |  |  |
Item Effected [Line Items] |  |  |  |  |  |
Allowance for credit losses on loans |  |  |  | 42,294 |  |
Total Allowance for credit losses |  |  |  | 43,194 |  |
Accounting Standards Update 2016-13 | Restatement Adjustment |  |  |  |  |  |
Item Effected [Line Items] |  |  |  |  |  |
Allowance for credit losses on loans |  |  | 47,484 |  |  |
Total Allowance for credit losses |  |  | 51,644 |  |  |
Commercial Portfolio |  |  |  |  |  |
Item Effected [Line Items] |  |  |  |  |  |
Allowance for credit losses on loans | 126,655 | 111,954 | 37,125 | 30,941 |  |
Commercial Portfolio | Previous Accounting Guidance |  |  |  |  |  |
Item Effected [Line Items] |  |  |  |  |  |
Allowance for credit losses on loans |  |  |  | 30,941 |  |
Commercial Portfolio | Accounting Standards Update 2016-13 | Restatement Adjustment |  |  |  |  |  |
Item Effected [Line Items] |  |  |  |  |  |
Allowance for credit losses on loans |  |  | 6,184 |  |  |
Consumer Portfolio |  |  |  |  |  |
Item Effected [Line Items] |  |  |  |  |  |
Allowance for credit losses on loans | $ 47,467 | $ 58,023 | 52,653 | 11,353 |  |
Consumer Portfolio | Previous Accounting Guidance |  |  |  |  |  |
Item Effected [Line Items] |  |  |  |  |  |
Allowance for credit losses on loans |  |  |  | 11,353 |  |
Consumer Portfolio | Accounting Standards Update 2016-13 | Restatement Adjustment |  |  |  |  |  |
Item Effected [Line Items] |  |  |  |  |  |
Allowance for credit losses on loans |  |  | 41,300 |  |  |
Unfunded Commitments |  |  |  |  |  |
Item Effected [Line Items] |  |  |  |  |  |
Total Allowance for credit losses |  |  | 5,060 |  |  |
Unfunded Commitments | Previous Accounting Guidance |  |  |  |  |  |
Item Effected [Line Items] |  |  |  |  |  |
Total Allowance for credit losses |  |  |  | $ 900 |  |
Unfunded Commitments | Accounting Standards Update 2016-13 | Restatement Adjustment |  |  |  |  |  |
Item Effected [Line Items] |  |  |  |  |  |
Total Allowance for credit losses |  |  | $ 4,160 |  |  |

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