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Goodwill and Intangible Assets
 3 Months Ended
Mar. 31, 2020
Goodwill and Intangible Assets Disclosure [Abstract]  
Goodwill and Intangible Assets Disclosure [Text Block] Goodwill and Intangible Assets
The following table presents the changes in the carrying amount of goodwill for the periods indicated:
Three Months Ended March 31,
(in thousands)2020
Goodwill, beginning of period
$91,918  
Fair value adjustment
2,059  
Total goodwill, end of period
$93,977  
Goodwill adjustments included the finalization of the purchase accounting adjustments for the ATBancorp acquisition.
The following table presents the gross carrying amount, accumulated amortization, and net carrying amount of other intangible assets for the periods indicated:
As of March 31, 2020As of December 31, 2019
(in thousands)Gross Carrying AmountAccumulated AmortizationNet Carrying AmountGross Carrying AmountAccumulated AmortizationNet Carrying Amount
Core deposit intangible$41,745  $(22,558) $19,187  $41,745  $(21,032) $20,713  
Customer relationship intangible5,265  (1,661) 3,604  5,265  (1,195) 4,070  
Other
2,700  (2,341) 359  2,700  (2,305) 395  
$49,710  $(26,560) $23,150  $49,710  $(24,532) $25,178  
Indefinite-lived trade name intangible$7,040  $7,040  
The following table provides the estimate future amortization expense for the remaining nine months ending December 31, 2020 and the succeeding periods:
Core Deposit IntangibleCustomer Relationship IntangibleOtherTotal
Estimated Amortization Expense for the Year Ending December 31,
2020$3,881  $969  $97  $4,947  
20214,190  1,062  106  5,358  
20223,487  797  79  4,363  
20232,833  518  51  3,402  
20242,180  239  24  2,443  
Thereafter2,616  19  2  2,637  
Total$19,187  $3,604  $359  $23,150