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ACCOUNTING POLICIES - New Accounting Standards (Narrative) (Details) - USD ($) $ in Thousands | 9 Months Ended |  |  |  |  |
--- | --- | --- | --- | --- | --- | ---
Sep. 30, 2020 | Jun. 30, 2020 | Jan. 01, 2020 | Dec. 31, 2019 | Sep. 30, 2019 | Dec. 31, 2018
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |
Allowance for credit losses on loans | $ 174,122 | $ 169,977 | $ 89,778 | $ 42,294 | $ 43,820 | $ 41,045
Available for sale securities, allowance for credit losses | 0 |  |  |  |  |
Decrease in retained earnings | 579,269 |  |  | $ 581,395 |  |
Increase in allowance for credit losses on Purchased with Credit Deterioration (PCD) assets | 2,386 |  |  |  |  |
Accounting Standards Update 2016-13 |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |
Allowance for credit losses |  |  | 2,400 |  |  |
Restatement Adjustment | Accounting Standards Update 2016-13 |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |
Allowance for credit losses on loans |  |  | $ 47,484 |  |  |
Cumulative Effect, Period of Adoption, Adjustment [Member] | Accounting Standards Update 2016-13 |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |
Decrease in retained earnings | $ (39,100) |  |  |  |  |

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