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GOODWILL (Tables)
6 Months Ended
Jun. 30, 2022
Goodwill and Intangible Assets Disclosure [Abstract]  
Changes in Carrying Amount of Goodwill
Changes in the carrying amount of goodwill for the three and six months ended June 30, 2022 and June 30, 2021 were as follows:
Three months endedSix months ended
June 30,June 30,
(Dollars in thousands)2022202120222021
Balance at beginning of period$999,959 $937,771 $1,000,749 $937,771 
Goodwill resulting from business combinations(790)
Balance at end of period$999,959 $937,771 $999,959 $937,771 
Finite-Lived Intangible Assets [Line Items]  
Schedule of Finite-Lived Intangible Assets [Table Text Block]
(Dollars in thousands)June 30, 2022December 31, 2021
Gross
carrying
amount
Accumulated
amortization
Gross
carrying
amount
Accumulated
amortization
Amortized intangible assets
Core deposit intangibles$45,256 $(28,509)$45,256 $(26,911)
Customer list69,563 (11,410)69,563 (8,362)
Other14,079 (6,090)14,589 (5,237)
Total$128,898 $(46,009)$129,408 $(40,510)