GOODWILL (Tables)

3 Months Ended

Mar. 31, 2024

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, 2024 and March 31, 2023 were as follows:

	Three months ended
	March 31,
(Dollars in thousands)	2024		2023
Balance at beginning of period	$	1,005,868	$	1,001,507
Goodwill resulting from business combinations	1,788		4,231
Balance at end of period	$	1,007,656	$	1,005,738

Finite-Lived Intangible Assets [Line Items]

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

(Dollars in thousands)	March 31, 2024				December 31, 2023
	Gross carrying amount		Accumulated amortization		Gross carrying amount		Accumulated amortization
Core deposit intangibles	$	41,750	$	(30,121)	$	41,750	$	(29,395)
Customer list	72,278		(22,094)		69,563		(20,553)
Other	11,931		(5,485)		10,960		(5,477)
Mortgage servicing rights	24,556		(7,212)		23,791		(6,690)
Total	$	150,515	$	(64,912)	$	146,064	$	(62,115)