v3.25.3
GOODWILL (Tables)
 9 Months Ended
Sep. 30, 2025
Goodwill and Intangible Assets Disclosure [Abstract]  
Changes in Carrying Amount of Goodwill
Changes in the carrying amount of goodwill for the three and nine months ended September 30, 2025 and September 30, 2024 were as follows:
Three months endedNine months ended
September 30,September 30,
(Dollars in thousands)2025202420252024
Balance at beginning of period$1,007,656 $1,007,656 $1,007,656 $1,005,868 
Goodwill resulting from business combinations0 0 0 1,788 
Balance at end of period$1,007,656 $1,007,656 $1,007,656 $1,007,656 
Finite-Lived Intangible Assets [Line Items]  
Schedule of Finite-Lived Intangible Assets [Table Text Block]
(Dollars in thousands)September 30, 2025December 31, 2024
Gross
carrying
amount		Accumulated
amortization		Gross
carrying
amount		Accumulated
amortization
Core deposit intangibles$41,750 $(34,482)$41,750 $(32,302)
Customer lists72,278 (31,551)72,278 (26,822)
Other9,269 (3,570)9,381 (3,416)
Mortgage servicing rights30,517 (10,414)27,217 (8,795)
Total$153,814 $(80,017)$150,626 $(71,335)