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GOODWILL AND INTANGIBLE ASSETS (Narrative) (Details) $ in Thousands | 3 Months Ended | 6 Months Ended | 9 Months Ended |
--- | --- | --- | --- | ---
Sep. 30, 2022 USD ($) segment | Sep. 30, 2021 USD ($) | Jun. 30, 2022 segment | Sep. 30, 2022 USD ($) | Sep. 30, 2021 USD ($) | Dec. 31, 2021 USD ($)
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |  |
Number of operating segments | segment | 2 |  | 1 |  |  |
Goodwill | $ 925,211 |  |  | $ 925,211 |  | $ 935,560
Impairment of goodwill or intangible assets |  |  |  | 0 |  |
Intangible assets, amortization expense | 2,480 | $ 3,381 |  | 8,434 | $ 10,679 |
Wholesale Banking |  |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |  |
Goodwill | 642,256 |  |  | 642,256 |  | 642,256
Consumer Banking |  |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |  |
Goodwill | $ 282,955 |  |  | 282,955 |  | $ 293,304
DHFB |  |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |  |
Goodwill reduction |  |  |  | 10,300 |  |
Intangible assets reduction |  |  |  | $ 5,700 |  |
Core Deposits | Minimum |  |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |  |
Intangible assets, amortization period (years) |  |  |  | 4 years |  |
Core Deposits | Maximum |  |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |  |
Intangible assets, amortization period (years) |  |  |  | 10 years |  |
Other amortizable intangibles | Minimum |  |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |  |
Intangible assets, amortization period (years) |  |  |  | 4 years |  |
Other amortizable intangibles | Maximum |  |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |  |
Intangible assets, amortization period (years) |  |  |  | 10 years |  |

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