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Intangible Assets, Goodwill and Other
 9 Months Ended
Sep. 30, 2023
Goodwill and Intangible Assets Disclosure [Abstract]  
Goodwill and Intangible Assets Disclosure [Text Block] Goodwill and Other Intangible Assets
At September 30, 2023, Columbia had $1.0 billion in goodwill related to the Merger, as compared to no goodwill at December 31, 2022. Goodwill represents the excess of the total acquisition price paid over the fair value of the assets acquired, net of fair value of liabilities assumed. Additional information on the Merger and purchase price allocations is provided in Note 2 - Business Combinations. Goodwill is not amortized but is evaluated for potential impairment on an annual basis or whenever events or changes in circumstances indicate the carrying value may not be recoverable. The Company will perform an annual impairment assessment as of October 31, 2023.

Core deposit intangible assets values were determined by an analysis of the cost differential between the core deposits inclusive of estimated servicing costs and alternative funding sources for core deposits acquired through business combinations. The core deposit intangible assets recorded are amortized on an accelerated basis over a period of 10 years. No impairment losses separate from the scheduled amortization have been recognized in the periods presented.

The following table summarizes other intangible assets as of the dates presented:

Other Intangible Assets
(in thousands)GrossAccumulated AmortizationNet
Balance, December 31, 2022$54,561 $(49,816)$4,745 
Net additions710,230 — 710,230 
Amortization— (12,660)(12,660)
Balance, March 31, 2023764,791 (62,476)702,315 
Amortization— (35,553)(35,553)
Balance, June 30, 2023764,791 (98,029)666,762 
Amortization— (29,879)(29,879)
Balance, September 30, 2023$764,791 $(127,908)$636,883 

The table below presents the forecasted amortization expense for intangible assets at September 30, 2023:
(in thousands)
YearExpected Amortization
Remainder of 2023
$33,205 
2024119,431 
2025105,458 
202692,545 
202779,632 
Thereafter206,612 
Total intangible assets$636,883