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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - New Accounting Standards (Narrative) (Details) - USD ($) $ in Thousands | 12 Months Ended |  |  |  |  |
--- | --- | --- | --- | --- | --- | ---
Dec. 31, 2020 | Jan. 01, 2020 | Dec. 31, 2019 | Jan. 01, 2019 | Dec. 31, 2018 | Dec. 31, 2017
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |
Lease liabilities | $ 58,901 |  | $ 66,052 |  |  |
Operating lease, right-of-use asset | 48,051 |  | 54,941 |  |  |
Allowance for credit losses on loans | 160,540 | $ 89,778 | 42,294 |  | $ 41,045 | $ 38,208
Available for sale securities, allowance for credit losses | 0 |  |  |  |  |
Impact of adoption of new guidance | 616,052 |  | $ 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 |  |  |  |
Accounting Standards Update 2016-02 |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |
Lease liabilities |  |  |  | $ 53,200 |  |
Operating lease, right-of-use asset |  |  |  | $ 48,900 |  |
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 | Accounting Standards Update 2016-13 |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |
Impact of adoption of new guidance | (39,100) |  |  |  |  |
Cumulative Effect, Period of Adoption, Adjustment | Accounting Standards Update 2016-02 |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |
Impact of adoption of new guidance | $ (1,100) |  |  |  |  |

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