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Goodwill and Intangible Assets (Tables)
 9 Months Ended
Sep. 30, 2020
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,
2020201920202019
(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(75,454)(65,852)(70,934)(60,455)
CDI, net at beginning of period30,019 39,621 34,539 45,018 
CDI current period amortization(2,193)(2,632)(6,713)(8,029)
Total CDI, net at end of period27,826 36,989 27,826 36,989 
Intangible assets not subject to amortization919 919 919 919 
Other intangible assets, net at end of period28,745 37,908 28,745 37,908 
Total goodwill and other intangible assets at end of period$794,587 $803,750 $794,587 $803,750 
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, 2020 and the succeeding four years:
Year ending December 31,
(in thousands)
2020$2,012 
20217,264 
20225,880 
20234,552 
20243,432