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Goodwill and Other Intangible Assets (Tables)
9 Months Ended
Sep. 30, 2021
Goodwill and Intangible Assets Disclosure [Abstract]  
Schedule of intangible assets subject to amortization
The following table provides information for intangible assets subject to amortization at the dates indicated (in thousands):
September 30, 2021December 31, 2020
Amortizable intangible assets:  
Core deposit intangibles - gross$74,899 71,182 
Acquisitions— 3,717 
Less: accumulated amortization(60,974)(56,896)
Core deposit intangibles - net$13,925 18,003 
Customer and Contract intangible assets - gross$12,775 12,775 
Customer list intangible assets disposed of due to sale of insurance business(1,591)— 
Less: accumulated amortization(11,068)(10,842)
Customer and Contract intangible assets - net116 1,933 
Total intangible assets - net$14,041 19,936 
Schedule of the actual aggregate amortization expense as well as estimated aggregate amortization expense, based upon current levels of intangible assets
The following table shows the actual aggregate amortization expense for the quarters ended September 30, 2021 and 2020, as well as the estimated aggregate amortization expense, based upon current levels of intangible assets, for the current fiscal year and each of the five succeeding fiscal years (in thousands):
For the quarter ended September 30, 2021$1,321 
For the quarter ended September 30, 20201,781 
For the nine months ended September 30, 20214,348 
For the nine months ended September 30, 20205,192 
For the year ending December 31, 20215,509 
For the year ending December 31, 20224,277 
For the year ending December 31, 20233,270 
For the year ending December 31, 20242,452 
For the year ending December 31, 20251,662 
For the year ending December 31, 2026871 
Schedule of the changes in carrying amount of goodwill The following table provides information for the changes in the carrying amount of goodwill (in thousands):
Total
Balance at December 31, 2019$346,103 
Goodwill acquired36,176 
Balance at December 31, 2020382,279 
Purchase accounting adjustment77 
Goodwill disposed of due to sale of insurance business(1,359)
Balance at September 30, 2021$380,997