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GOODWILL (Tables)
 6 Months Ended
Jun. 30, 2024
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, 2024 and June 30, 2023 were as follows:
Three months endedSix months ended
June 30,June 30,
(Dollars in thousands)2024202320242023
Balance at beginning of period$1,007,656 $1,005,738 $1,005,868 $1,001,507 
Goodwill resulting from business combinations0 90 1,788 4,321 
Balance at end of period$1,007,656 $1,005,828 $1,007,656 $1,005,828 
Finite-Lived Intangible Assets [Line Items]  
Schedule of Finite-Lived Intangible Assets [Table Text Block]
(Dollars in thousands)June 30, 2024December 31, 2023
Gross
carrying
amount		Accumulated
amortization		Gross
carrying
amount		Accumulated
amortization
Core deposit intangibles$41,750 $(30,848)$41,750 $(29,395)
Customer list72,278 (23,670)69,563 (20,553)
Other9,381 (3,140)10,960 (5,477)
Mortgage servicing rights25,500 (7,723)23,791 (6,690)
Total$148,909 $(65,381)$146,064 $(62,115)