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GOODWILL AND IDENTIFIABLE INTANGIBLE ASSETS (Details) - USD ($) $ in Thousands | 9 Months Ended |
--- | --- | ---
Sep. 30, 2021 | Dec. 31, 2020
Identifiable Intangible Assets |  |
Gross Carrying Amount | $ 186,202 | $ 159,865
Accumulated Amortization | (117,225) | (106,925)
Net Carrying Amount | 68,977 | 52,940
Estimated aggregate amortization expense for each of five succeeding fiscal years |  |
Oct - Dec 2021 | 3,751 |
2022 | 13,668 |
2023 | 11,595 |
2024 | 9,782 |
2025 | 8,349 |
Thereafter | 21,832 |
Net Carrying Amount | 68,977 | 52,940
Components of goodwill |  |
Goodwill, net, beginning of period | 793,708 |
Goodwill, net, activity | 5,419 |
Goodwill, net, end of period | 799,127 |
Core deposit intangibles |  |
Identifiable Intangible Assets |  |
Gross Carrying Amount | 69,403 | 69,403
Accumulated Amortization | (59,238) | (55,572)
Net Carrying Amount | 10,165 | 13,831
Estimated aggregate amortization expense for each of five succeeding fiscal years |  |
Net Carrying Amount | 10,165 | 13,831
Other intangibles |  |
Identifiable Intangible Assets |  |
Gross Carrying Amount | 116,799 | 90,462
Accumulated Amortization | (57,987) | (51,353)
Net Carrying Amount | 58,812 | 39,109
Estimated aggregate amortization expense for each of five succeeding fiscal years |  |
Net Carrying Amount | $ 58,812 | $ 39,109

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