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GOODWILL AND OTHER INTANGIBLE ASSETS GOODWILL (Tables)
 12 Months Ended
Dec. 31, 2021
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, 2021, 2020 and 2019 are shown below.
(Dollars in thousands)202120202019
Balance at beginning of year$937,771 $937,771 $880,251 
Goodwill resulting from business combinations62,978 0 57,520 
Balance at end of year$1,000,749 $937,771 $937,771 
Schedule of Finite-Lived Intangible Assets
The gross carrying amount and accumulated amortization of other intangible assets were as follows:
(Dollars in thousands)December 31, 2021December 31, 2020
Amortized intangible assets
Core deposit intangibles$45,256 $(26,911)$51,031 $(27,524)
Customer list69,563 (8,362)39,420 (4,778)
Other14,589 (5,237)10,113 (3,710)
Total$129,408 $(40,510)$100,564 $(36,012)
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
2022$11,515 
202310,536 
20249,193 
20259,145 
20269,092