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GOODWILL (Tables)
3 Months Ended
Mar. 31, 2025
Goodwill and Intangible Assets Disclosure [Abstract]  
Changes in Carrying Amount of Goodwill
Changes in the carrying amount of goodwill for the three months ended March 31, 2025 and March 31, 2024 were as follows:
Three months ended
March 31,
(Dollars in thousands)20252024
Balance at beginning of period$1,007,656 $1,005,868 
Goodwill resulting from business combinations1,788 
Balance at end of period$1,007,656 $1,007,656 
Finite-Lived Intangible Assets [Line Items]  
Schedule of Finite-Lived Intangible Assets [Table Text Block]
(Dollars in thousands)March 31, 2025December 31, 2024
Gross
carrying
amount
Accumulated
amortization
Gross
carrying
amount
Accumulated
amortization
Core deposit intangibles$41,750 $(33,028)$41,750 $(32,302)
Customer lists72,278 (28,399)72,278 (26,822)
Other9,269 (3,396)9,381 (3,416)
Mortgage servicing rights27,889 (9,361)27,217 (8,795)
Total$151,186 $(74,184)$150,626 $(71,335)