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GOODWILL AND IDENTIFIABLE INTANGIBLE ASSETS (Details) - USD ($) $ in Thousands | 9 Months Ended |
--- | --- | ---
Sep. 30, 2023 | Dec. 31, 2022
Identifiable Intangible Assets |  |
Gross Carrying Amount | $ 203,076 | $ 197,186
Accumulated Amortization | (147,138) | (136,190)
Total | 55,938 | 60,996
Estimated aggregate amortization expense for each of five succeeding fiscal years |  |
Oct - Dec 2023 | 3,563 |
2024 | 12,808 |
2025 | 10,927 |
2026 | 9,625 |
2027 | 4,049 |
Thereafter | 14,966 |
Total | 55,938 | 60,996
Components of goodwill |  |
Goodwill, beginning of period | 841,841 |
Goodwill, additions | 3,555 |
Goodwill, end of period | 845,396 |
Core deposit intangibles |  |
Identifiable Intangible Assets |  |
Gross Carrying Amount | 77,373 | 77,373
Accumulated Amortization | (68,286) | (65,069)
Total | 9,087 | 12,304
Estimated aggregate amortization expense for each of five succeeding fiscal years |  |
Total | 9,087 | 12,304
Other intangibles |  |
Identifiable Intangible Assets |  |
Gross Carrying Amount | 125,703 | 119,813
Accumulated Amortization | (78,852) | (71,121)
Total | 46,851 | 48,692
Estimated aggregate amortization expense for each of five succeeding fiscal years |  |
Total | $ 46,851 | $ 48,692

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