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Goodwill and Intangible Assets (Tables)
 3 Months Ended
Mar. 31, 2022
Goodwill and Intangible Assets Disclosure [Abstract]  
Schedule of Goodwill and Intangible Assets
The following table sets forth activity for goodwill and other intangible assets for the periods indicated:
Three Months Ended March 31,
20222021
(in thousands)
Goodwill
Total goodwill$823,172 $765,842 
Other intangible assets, net
CDI:
Gross CDI balance at beginning of period (1)88,931 105,473 
Accumulated amortization at beginning of period(55,203)(79,658)
CDI, net at beginning of period33,728 25,815 
CDI current period amortization(2,288)(1,924)
Total CDI, net at end of period31,440 23,891 
Intangible assets not subject to amortization919 919 
Other intangible assets, net at end of period32,359 24,810 
Total goodwill and other intangible assets at end of period$855,531 $790,652 
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(1) For the three months ended March 31, 2022, the gross CDI balance, beginning of period excludes fully amortized amounts. Prior period column has not been adjusted.
Estimated Future Amortization Expense of Core Deposit Intangibles
The following table provides the estimated future amortization expense of our CDI for the remaining nine months ending December 31, 2022 and the succeeding four years:
Year ending December 31,
(in thousands)
2022$6,410 
20237,082 
20245,673 
20254,366 
20263,225