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Goodwill and Intangible Assets (Tables)
 9 Months Ended
Sep. 30, 2021
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 September 30,Nine Months Ended September 30,
2021202020212020
(in thousands)
Goodwill
Total goodwill$765,842 $765,842 $765,842 $765,842 
Other intangible assets, net
CDI:
Gross CDI balance at beginning of period105,473 105,473 105,473 105,473 
Accumulated amortization at beginning of period(83,434)(75,454)(79,658)(70,934)
CDI, net at beginning of period22,039 30,019 25,815 34,539 
CDI current period amortization(1,835)(2,193)(5,611)(6,713)
Total CDI, net at end of period20,204 27,826 20,204 27,826 
Intangible assets not subject to amortization919 919 919 919 
Other intangible assets, net at end of period21,123 28,745 21,123 28,745 
Total goodwill and other intangible assets at end of period$786,965 $794,587 $786,965 $794,587 
Estimated Future Amortization Expense of Core Deposit Intangibles
The following table provides the estimated future amortization expense of our CDI for the remaining three months ending December 31, 2021 and the succeeding four years:
Year ending December 31,
(in thousands)
2021$1,653 
20225,880 
20234,552 
20243,432 
20252,415