GOODWILL (Tables)

9 Months Ended

Sep. 30, 2022

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, 2022 and September 30, 2021 were as follows:

	Three months ended				Nine months ended
	September 30,				September 30,
(Dollars in thousands)	2022		2021		2022		2021
Balance at beginning of period	$	999,959	$	937,771	$	1,000,749	$	937,771
Goodwill resulting from business combinations	(1,537)		0		(2,327)		0
Balance at end of period	$	998,422	$	937,771	$	998,422	$	937,771

Finite-Lived Intangible Assets [Line Items]

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

(Dollars in thousands)	September 30, 2022				December 31, 2021
	Gross carrying amount		Accumulated amortization		Gross carrying amount		Accumulated amortization
Amortized other intangible assets
Core deposit intangibles	$	41,750	$	(25,761)	$	45,256	$	(26,911)
Customer list	69,563		(12,933)		69,563		(8,362)
Other	14,079		(6,668)		14,589		(5,237)
Unamortized other intangible assets
Mortgage servicing rights	16,498		0		15,469		0
Total	$	141,890	$	(45,362)	$	144,877	$	(40,510)