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Goodwill and Other Intangible Assets (Tables)
12 Months Ended
Dec. 31, 2020
Goodwill and Intangible Assets Disclosure [Abstract]  
Changes in the carrying amount of goodwill
Changes in the carrying amount of goodwill during the years ended December 31, 2020 were as follows:
 Community BanksInsurance Total
Balance at December 31, 2018$930,161 $2,767 $932,928 
Measurement period adjustments to goodwill from Brand acquisition6,755 — 6,755 
Balance at December 31, 2019$936,916 $2,767 $939,683 
Additions to goodwill and other adjustments— — — 
Balance at December 31, 2020$936,916 $2,767 $939,683 
Summary of finite-lived intangible assets
The following table provides a summary of finite-lived intangible assets as of the dates presented:
Gross  Carrying
Amount
Accumulated
Amortization
Net Carrying
Amount
December 31, 2020
Core deposit intangible$82,492 $(53,539)$28,953 
Customer relationship intangible2,470 (1,284)1,186 
Total finite-lived intangible assets$84,962 $(54,823)$30,139 
December 31, 2019
Core deposit intangible$82,492 $(46,599)$35,893 
Customer relationship intangible2,470 (1,103)1,367 
Total finite-lived intangible assets$84,962 $(47,702)$37,260 
Estimated amortization expense of finite-lived intangible assets for future periods
The estimated amortization expense of finite-lived intangible assets for the five succeeding fiscal years is summarized as follows:
Core Deposit IntangibleCustomer Relationship IntangibleTotal
2021$5,860 $181 $6,041 
20224,940 181 5,121 
20234,042 181 4,223 
20243,498 181 3,679 
20253,102 181 3,283