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Goodwill and Other Intangible Assets (Tables)
 9 Months Ended
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, 2021December 31, 2020
Community Banking Reporting Unit$256,323 $256,323 
Wholesale Banking Reporting Unit171,636 171,636 
Consumer Mortgage Reporting Unit— — 
Wealth Management Reporting Unit24,431 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)2021202020212020
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 AmountAccumulated AmortizationNet 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 
Other12,500 (4,959)7,541 
Total other intangible assets$69,900 $(24,788)$45,112