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GOODWILL AND INTANGIBLE ASSETS (Narrative) (Details) $ in Thousands |  | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Jan. 01, 2023 USD ($) | Jun. 30, 2023 USD ($) | Sep. 30, 2022 segment | Jun. 30, 2022 USD ($) | Jun. 30, 2023 USD ($) segment | Jun. 30, 2022 USD ($) segment | Dec. 31, 2022 USD ($)
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |  |  |
Number of operating segments | segment |  |  | 2 |  | 2 | 1 |
Goodwill |  | $ 925,211 |  |  | $ 925,211 |  | $ 925,211
Intangible Assets |  | 23,469 |  |  | 23,469 |  | 26,761
Impairment of goodwill or intangible assets |  |  |  |  | 0 |  |
Impairment charges for goodwill |  |  |  |  | 0 |  | 0
Intangible assets, amortization expense |  | 2,216 |  | $ 2,915 | 4,494 | $ 5,954 |
Goodwill |  |  |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |  |  |
Reallocation from Consumer Banking segment to Wholesale Banking segment | $ 9,600 |  |  |  |  |  |
Intangible assets |  |  |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |  |  |
Reallocation from Consumer Banking segment to Wholesale Banking segment | $ 1,600 |  |  |  |  |  |
Wholesale Banking |  |  |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |  |  |
Goodwill |  | 639,180 |  |  | 639,180 |  | 639,180
Intangible Assets |  | 1,430 |  |  | 1,430 |  | 1,558
Consumer Banking |  |  |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |  |  |
Goodwill |  | 286,031 |  |  | 286,031 |  | 286,031
Intangible Assets |  | 1,227 |  |  | 1,227 |  | 75
Corporate Other |  |  |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |  |  |
Goodwill |  | 0 |  |  | 0 |  | 0
Intangible Assets |  | $ 20,812 |  |  | $ 20,812 |  | $ 25,128
Core Deposits | Minimum |  |  |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |  |  |
Intangible assets, amortization period (years) |  | 4 years |  |  | 4 years |  |
Core Deposits | Maximum |  |  |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |  |  |
Intangible assets, amortization period (years) |  | 10 years |  |  | 10 years |  |
Other amortizable intangibles | Minimum |  |  |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |  |  |
Intangible assets, amortization period (years) |  | 4 years |  |  | 4 years |  |
Other amortizable intangibles | Maximum |  |  |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |  |  |
Intangible assets, amortization period (years) |  | 10 years |  |  | 10 years |  |

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