GOODWILL AND IDENTIFIABLE INTANGIBLE ASSETS (Tables)

12 Months Ended

Dec. 31, 2023

Goodwill and Intangible Assets Disclosure [Abstract]

Schedule of Intangible Assets and Goodwill [Table Text Block]

The following table sets forth the carrying value of goodwill and other intangible assets, net of accumulated amortization, at December 31:

	2023		2022
	(Dollars in thousands)
Balances not subject to amortization
Goodwill	$	985,072	$	985,072
Balances subject to amortization
Core deposit intangibles	15,237		20,757
Other intangible assets	2,953		4,311
Total other intangible assets	18,190		25,068
Total goodwill and other intangible assets	$	1,003,262	$	1,010,140

Schedule of Goodwill

The changes in the carrying value of goodwill for the periods indicated were as follows:

	2023		2022		2021
	(Dollars in thousands)
Balance at beginning of year	$	985,072	$	985,072	$	506,206
Acquisitions	—		—		478,866
Balance at end of year	$	985,072	$	985,072	985,072

Schedule of Other Intangible Assets

The gross carrying amount and accumulated amortization of other intangible assets were as follows at the dates indicated:

	December 31
	2023						2022
	Gross Carrying Amount		Accumulated Amortization		Net Carrying Amount		Gross Carrying Amount		Accumulated Amortization		Net Carrying Amount
	(Dollars in thousands)
Core deposit intangibles	$	46,770	$	(31,533)	$	15,237	$	46,770	$	(26,013)	$	20,757
Other intangible assets	6,100		(3,147)		2,953		6,100		(1,789)		4,311
Total	$	52,870	$	(34,680)	$	18,190	$	52,870	$	(27,802)	$	25,068

Schedule of Intangible Assets Estimated Annual Amortization Expense

The following table sets forth the estimated annual amortization expense of intangible assets for each of the next five years:

Year	Amount
	(Dollars in thousands)
2024	$	5,905
2025	$	4,716
2026	$	2,820
2027	$	2,077
2028	$	1,377