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Goodwill and Other Intangible Assets (Tables) | 9 Months Ended
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Sep. 30, 2021
Goodwill and Intangible Assets Disclosure [Abstract] |
Schedule of Goodwill | Goodwill allocated to each reporting unit at September 30, 2021 and December 31, 2020 is presented as follows:
(in thousands) | September 30, 2021 |  | December 31, 2020 |
Community Banking Reporting Unit | $ | 256,323 |  |  | $ | 256,323 |  |
Wholesale Banking Reporting Unit | 171,636 |  |  | 171,636 |  |
Consumer Mortgage Reporting Unit | — |  |  | — |  |
Wealth Management Reporting Unit | 24,431 |  |  | 24,431 |  |
Total Goodwill | $ | 452,390 |  |  | $ | 452,390 |  |
The following table presents changes in the carrying amount of goodwill for the three and nine months ended September 30, 2021 and 2020.
| Three Months Ended September 30, |  | Nine Months Ended September 30,
(in thousands) | 2021 |  | 2020 |  | 2021 |  | 2020
Balance at beginning of period | $ | 452,390 |  |  | $ | 497,267 |  |  | $ | 452,390 |  |  | $ | 497,267 |
Changes during the period from: |  |  |  |  |  |  |
Goodwill impairment | — |  |  | (44,877) |  |  | — |  |  | (44,877) |
Balance at end of period | $ | 452,390 |  |  | $ | 452,390 |  |  | $ | 452,390 |  |  | $ | 452,390 |
Schedule of Other Intangible Assets | The following table shows the gross carrying amount and accumulated amortization of other intangible assets as of September 30, 2021 and December 31, 2020, which primarily consist of core deposit intangible assets. The CDI is being amortized over its estimated useful life of approximately ten years utilizing an accelerated method. Aggregate other intangible assets amortization expense for the three and nine months ended September 30, 2021 was $2.4 million and $7.1 million, respectively. Aggregate other intangible assets amortization expense for the three and nine months ended September 30, 2020 was $2.6 million and $7.9 million, respectively.
(in thousands) | Gross Carrying Amount |  | Accumulated Amortization |  | Net Carrying Value
September 30, 2021 |  |  |  |  |
CDI | $ | 57,400 |  |  | $ | (26,091) |  |  | $ | 31,309 |
Other | 12,500 |  |  | (5,834) |  |  | 6,666 |
Total other intangible assets | $ | 69,900 |  |  | $ | (31,925) |  |  | $ | 37,975 |
December 31, 2020 |  |  |  |  |
CDI | $ | 57,400 |  |  | $ | (19,829) |  |  | $ | 37,571 |
Other | 12,500 |  |  | (4,959) |  |  | 7,541 |
Total other intangible assets | $ | 69,900 |  |  | $ | (24,788) |  |  | $ | 45,112 |

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- Definition Tabular disclosure of assets, excluding financial assets and goodwill, lacking physical substance with a finite life, by either major class or business segment. + 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) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16265-109275 + Details
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