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GOODWILL AND IDENTIFIABLE INTANGIBLE ASSETS (Details) - USD ($) $ in Thousands | 3 Months Ended |
--- | --- | ---
Mar. 31, 2021 | Dec. 31, 2020
Identifiable Intangible Assets [Abstract] |  |
Gross Carrying Amount | $ 159,865 | $ 159,865
Accumulated Amortization | (110,276) | (106,925)
Net Carrying Amount | 49,589 | 52,940
Estimated aggregate amortization expense for each of five succeeding fiscal years [Abstract] |  |
Apr - Dec 2021 | 9,289 |
2022 | 10,844 |
2023 | 9,082 |
2024 | 7,551 |
2025 | 6,374 |
Thereafter | 6,449 |
Net Carrying Amount | 49,589 | 52,940
Components of goodwill [Abstract] |  |
Goodwill, net, beginning of period | 793,708 |
Goodwill, net, activity | (252) |
Goodwill, net, end of period | 793,456 |
Core deposit intangibles [Member] |  |
Identifiable Intangible Assets [Abstract] |  |
Gross Carrying Amount | 69,403 | 69,403
Accumulated Amortization | (56,896) | (55,572)
Net Carrying Amount | 12,507 | 13,831
Estimated aggregate amortization expense for each of five succeeding fiscal years [Abstract] |  |
Net Carrying Amount | 12,507 | 13,831
Other intangibles [Member] |  |
Identifiable Intangible Assets [Abstract] |  |
Gross Carrying Amount | 90,462 | 90,462
Accumulated Amortization | (53,380) | (51,353)
Net Carrying Amount | 37,082 | 39,109
Estimated aggregate amortization expense for each of five succeeding fiscal years [Abstract] |  |
Net Carrying Amount | $ 37,082 | $ 39,109

X
- Definition Amount of amortization for asset, excluding financial asset and goodwill, lacking physical substance with finite life expected to be recognized after fourth fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach). + References No definition available. + Details
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- Definition Amount of amortization for assets, excluding financial assets and goodwill, lacking physical substance with finite life expected to be recognized in fourth fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 + Details
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