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GOODWILL AND OTHER INTANGIBLE ASSETS GOODWILL (Tables)
12 Months Ended
Dec. 31, 2020
Goodwill and Intangible Assets Disclosure [Abstract]  
Changes in Carrying Amount of Goodwill
Changes in the carrying amount of goodwill for the years ended December 31, 2020, 2019 and 2018 are shown below.
(Dollars in thousands)202020192018
Balance at beginning of year$937,771 $880,251 $204,084 
Goodwill resulting from business combinations57,520 676,167 
Balance at end of year$937,771 $937,771 $880,251 
Schedule of Finite-Lived Intangible Assets
The gross carrying amount and accumulated amortization of other intangible assets at December 31, 2020 and December 31, 2019 were as follows:
(Dollars in thousands)December 31, 2020December 31, 2019
Amortized intangible assets
Core deposit intangibles$51,031 $(27,524)$51,031 $(21,149)
Customer list39,420 (4,778)39,420 (1,195)
Other10,113 (3,710)10,093 (1,999)
Total$100,564 $(36,012)$100,544 $(24,343)
Schedule of Finite-Lived Intangible Assets, Future Amortization Expense The estimated amortization expense of intangible assets for the next five years is as follows:
(Dollars in thousands)Intangible amortization
2021$10,249 
20227,708 
20236,729 
20246,660 
20256,611