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OTHER INTANGIBLES - Core Deposit Intangibles (Details) - USD ($) $ in Thousands | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2023 | Dec. 31, 2022
Goodwill and Intangible Assets Disclosure [Abstract] |  |
Gross carrying amount | $ 123,285 | $ 104,643
Other intangibles acquired | 0 | 18,642
Accumulated amortization | (94,004) | (87,443)
Total core deposit and other intangibles | $ 29,281 | $ 35,842

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