GOODWILL (Tables)

9 Months Ended

Sep. 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 nine months ended September 30, 2024 and September 30, 2023 were as follows:

	Three months ended				Nine months ended
	September 30,				September 30,
(Dollars in thousands)	2024		2023		2024		2023
Balance at beginning of period	$	1,007,656	$	1,005,828	$	1,005,868	$	1,001,507
Goodwill resulting from business combinations	0		40		1,788		4,361
Balance at end of period	$	1,007,656	$	1,005,868	$	1,007,656	$	1,005,868

Finite-Lived Intangible Assets [Line Items]

Schedule of Finite-Lived Intangible Assets [Table Text Block]

(Dollars in thousands)	September 30, 2024				December 31, 2023
	Gross carrying amount		Accumulated amortization		Gross carrying amount		Accumulated amortization
Core deposit intangibles	$	41,750	$	(31,575)	$	41,750	$	(29,395)
Customer list	72,278		(25,246)		69,563		(20,553)
Other	9,381		(3,284)		10,960		(5,477)
Mortgage servicing rights	26,508		(8,265)		23,791		(6,690)
Total	$	149,917	$	(68,370)	$	146,064	$	(62,115)