GOODWILL (Tables)

9 Months Ended

Sep. 30, 2023

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, 2023 and September 30, 2022 were as follows:

	Three months ended				Nine months ended
	September 30,				September 30,
(Dollars in thousands)	2023		2022		2023		2022
Balance at beginning of period	$	1,005,828	$	999,959	$	1,001,507	$	1,000,749
Goodwill resulting from business combinations	40		(1,537)		4,361		(2,327)
Balance at end of period	$	1,005,868	$	998,422	$	1,005,868	$	998,422

Finite-Lived Intangible Assets [Line Items]

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

(Dollars in thousands)	September 30, 2023				December 31, 2022
	Gross carrying amount		Accumulated amortization		Gross carrying amount		Accumulated amortization
Core deposit intangibles	$	41,750	$	(28,668)	$	41,750	$	(26,488)
Customer list	69,563		(19,029)		69,563		(14,457)
Other	10,960		(5,073)		14,079		(7,064)
Mortgage servicing rights	23,067		(6,192)		21,347		(4,811)
Total	$	145,340	$	(58,962)	$	146,739	$	(52,820)